chore: update lockfiles for 1.2.0a2 / 4.1.0a2

- Add test_add_messages_to_delta_migration_preserves_message_history (sync
  + async) covering the primary real-world BinaryOperatorAggregate →
  DeltaChannel migration path with real Message objects and IDs
- Hoist all in-function imports to module level in test_channels.py and
  fix _delta_channel_with_type helper accordingly
- Add section headers in test_channels.py for better navigation

.github/workflows/_integration_test.yml

@@ -9,9 +9,6 @@ on:
 permissions:
   contents: read
 
-env:
-  GO_VERSION: "1.23"
-
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -54,23 +51,12 @@ jobs:
           python-version: ${{ matrix.python-version }}
           enable-cache: "false"
           working-directory: libs/cli
-      - name: Set up Go
-        if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
       - name: Install cli globally
         if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
         run: pip install -e .
-      - name: Build Go CLI binary
-        if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
-        run: make build-go
       - name: Build service ${{ matrix.example.name }}
         if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
         working-directory: ${{ matrix.example.workdir }}
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t ${{ matrix.example.tag }}
       - name: Test service ${{ matrix.example.name }}
@@ -78,8 +64,6 @@ jobs:
         working-directory: ${{ matrix.example.workdir }}
         env:
           LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           # Prepare environment file from local or parent example directory
           if [ -f .env.example ]; then cp .env.example .env; elif [ -f ../.env.example ]; then cp ../.env.example .env && cp ../.env.example ../.env; fi
@@ -92,27 +76,18 @@ jobs:
       - name: Build JS service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/js-examples
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-e
 
       - name: Build JS monorepo service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/js-monorepo-example
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-f -c apps/agent/langgraph.json --build-command "yarn run turbo build" --install-command "yarn install"
 
       - name: Build Python monorepo service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/python-monorepo-example
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-g -c apps/agent/langgraph.json
       - name: Test Python monorepo service
@@ -120,8 +95,6 @@ jobs:
         working-directory: libs/cli/python-monorepo-example
         env:
           LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           cp apps/agent/.env.example apps/agent/.env
           echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> apps/agent/.env
@@ -130,9 +103,6 @@ jobs:
       - name: Build prerelease reqs service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/examples/graph_prerelease_reqs
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-h
       - name: Test prerelease reqs service
@@ -140,8 +110,6 @@ jobs:
         working-directory: libs/cli/examples/graph_prerelease_reqs
         env:
           LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           cp ../.env.example .env
           echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
@@ -166,18 +134,12 @@ jobs:
       - name: Build and test prerelease reqs fail service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/examples/graph_prerelease_reqs_fail
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-i || [ $? -eq 1 ]
 
       - name: Build uv simple service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/uv-examples/simple
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-uv-simple
       - name: Test uv simple service
@@ -185,8 +147,6 @@ jobs:
         working-directory: libs/cli/uv-examples/simple
         env:
           LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           cp .env.example .env
           echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
@@ -195,9 +155,6 @@ jobs:
       - name: Build uv monorepo service
         if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
         working-directory: libs/cli/uv-examples/monorepo/apps/agent
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           langgraph build -t langgraph-test-uv-monorepo
       - name: Test uv monorepo service
@@ -205,8 +162,6 @@ jobs:
         working-directory: libs/cli/uv-examples/monorepo/apps/agent
         env:
           LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
         run: |
           cp .env.example .env
           echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env

.github/workflows/_test.yml

@@ -11,9 +11,6 @@ on:
 permissions:
   contents: read
 
-env:
-  GO_VERSION: "1.23"
-
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -29,23 +26,12 @@ jobs:
     name: "test #${{ matrix.python-version }}"
     steps:
       - uses: actions/checkout@v6
-      - name: Get changed files
-        id: changed-files
-        if: ${{ inputs.working-directory == 'libs/cli' && github.event_name != 'workflow_dispatch' }}
-        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
-        with:
-          filter: "libs/cli/**"
       - name: Set up Python ${{ matrix.python-version }}
         uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ matrix.python-version }}
           cache-suffix: test-${{ inputs.working-directory }}
           working-directory: ${{ inputs.working-directory }}
-      - name: Set up Go
-        if: ${{ inputs.working-directory == 'libs/cli' && (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') }}
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
       - name: Login to Docker Hub
         uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
@@ -58,26 +44,11 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
         run: uv sync --frozen --group test --no-dev
 
-      - name: Build Go CLI binary
-        if: ${{ inputs.working-directory == 'libs/cli' && (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') }}
-        shell: bash
-        working-directory: ${{ inputs.working-directory }}
-        run: make build-go
-
       - name: Run tests
         shell: bash
         working-directory: ${{ inputs.working-directory }}
         run: make test
 
-      - name: Run Go CLI smoke tests
-        if: ${{ inputs.working-directory == 'libs/cli' && (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') }}
-        shell: bash
-        working-directory: ${{ inputs.working-directory }}
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-          LANGGRAPH_GO_CLI_PATH: ${{ github.workspace }}/libs/cli/langgraph_cli/bin/langgraph
-        run: TEST='tests/unit_tests/test_go_cli_smoke.py' make test
-
       - name: Ensure the tests did not create any additional files
         shell: bash
         working-directory: ${{ inputs.working-directory }}

.github/workflows/_test_release.yml

@@ -10,7 +10,6 @@ on:
 
 env:
   PYTHON_VERSION: "3.10"
-  GO_VERSION: "1.23"
 
 permissions:
   contents: read
@@ -33,17 +32,6 @@ jobs:
           cache-suffix: "release"
           working-directory: ${{ inputs.working-directory }}
 
-      - name: Set up Go
-        if: inputs.working-directory == 'libs/cli'
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-
-      - name: Cross-compile Go binaries
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        run: make build-go-all GO_BIN_DIR=build/go-bin
-
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
       # The release stage has trusted publishing and GitHub repo contents write access,
@@ -55,40 +43,7 @@ jobs:
       # > It is strongly advised to separate jobs for building [...]
       # > from the publish job.
       # https://github.com/pypa/gh-action-pypi-publish#non-goals
-      - name: Build CLI platform wheels
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        run: |
-          TARGETS=(
-            "linux-amd64     manylinux_2_17_x86_64.manylinux2014_x86_64"
-            "linux-arm64     manylinux_2_17_aarch64.manylinux2014_aarch64"
-            "linux-arm       manylinux_2_17_armv7l.manylinux2014_armv7l"
-            "linux-386       manylinux_2_17_i686.manylinux2014_i686"
-            "linux-ppc64le   manylinux_2_17_ppc64le.manylinux2014_ppc64le"
-            "linux-s390x     manylinux_2_17_s390x.manylinux2014_s390x"
-            "linux-amd64     musllinux_1_2_x86_64"
-            "linux-arm64     musllinux_1_2_aarch64"
-            "linux-arm       musllinux_1_2_armv7l"
-            "linux-386       musllinux_1_2_i686"
-            "darwin-amd64    macosx_11_0_x86_64"
-            "darwin-arm64    macosx_11_0_arm64"
-            "windows-amd64   win_amd64"
-            "windows-arm64   win_arm64"
-            "windows-386     win32"
-          )
-          for entry in "${TARGETS[@]}"; do
-            key=$(echo "$entry" | awk '{print $1}')
-            plat=$(echo "$entry" | awk '{print $2}')
-            ext=""
-            if [[ "$key" == windows-* ]]; then ext=".exe"; fi
-            binary="build/go-bin/langgraph-${key}${ext}"
-            LANGGRAPH_GO_BINARY="$binary" LANGGRAPH_WHEEL_PLAT="$plat" uv build --wheel
-          done
-          rm -rf langgraph_cli/bin
-          uv build
-
       - name: Build project for distribution
-        if: inputs.working-directory != 'libs/cli'
         run: uv build
         working-directory: ${{ inputs.working-directory }}
 

.github/workflows/release.yml

@@ -13,7 +13,6 @@ permissions:
 
 env:
   PYTHON_VERSION: "3.11"
-  GO_VERSION: "1.23"
 
 jobs:
   build:
@@ -35,71 +34,6 @@ jobs:
           cache-suffix: "release"
           working-directory: ${{ inputs.working-directory }}
 
-      # -- Go cross-compilation (libs/cli only) --
-      # When releasing the CLI, we cross-compile the Go binary for each
-      # platform and build platform-specific wheels that bundle it.
-      - name: Set up Go
-        if: inputs.working-directory == 'libs/cli'
-        uses: actions/setup-go@v5
-        with:
-          go-version: ${{ env.GO_VERSION }}
-
-      - name: Cross-compile Go binaries
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        run: make build-go-all GO_BIN_DIR=build/go-bin
-
-      - name: Run Go tests
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        run: go test -count=1 -race ./...
-
-      - name: Build CLI platform wheels
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        run: |
-          # Each entry: GO_BINARY_KEY WHEEL_PLATFORM_TAG
-          #
-          # Since Go builds are statically linked (CGO_ENABLED=0), the same
-          # linux binary works on both glibc and musl. We produce separate
-          # manylinux and musllinux wheels so pip installs the right one.
-          TARGETS=(
-            # Linux glibc
-            "linux-amd64     manylinux_2_17_x86_64.manylinux2014_x86_64"
-            "linux-arm64     manylinux_2_17_aarch64.manylinux2014_aarch64"
-            "linux-arm       manylinux_2_17_armv7l.manylinux2014_armv7l"
-            "linux-386       manylinux_2_17_i686.manylinux2014_i686"
-            "linux-ppc64le   manylinux_2_17_ppc64le.manylinux2014_ppc64le"
-            "linux-s390x     manylinux_2_17_s390x.manylinux2014_s390x"
-            # Linux musl (same Go binaries, different wheel tag)
-            "linux-amd64     musllinux_1_2_x86_64"
-            "linux-arm64     musllinux_1_2_aarch64"
-            "linux-arm       musllinux_1_2_armv7l"
-            "linux-386       musllinux_1_2_i686"
-            # macOS
-            "darwin-amd64    macosx_11_0_x86_64"
-            "darwin-arm64    macosx_11_0_arm64"
-            # Windows
-            "windows-amd64   win_amd64"
-            "windows-arm64   win_arm64"
-            "windows-386     win32"
-          )
-          for entry in "${TARGETS[@]}"; do
-            key=$(echo "$entry" | awk '{print $1}')
-            plat=$(echo "$entry" | awk '{print $2}')
-            ext=""
-            if [[ "$key" == windows-* ]]; then ext=".exe"; fi
-            binary="build/go-bin/langgraph-${key}${ext}"
-            echo "Building wheel for ${key} -> ${plat}..."
-            LANGGRAPH_GO_BINARY="$binary" LANGGRAPH_WHEEL_PLAT="$plat" uv build --wheel
-          done
-          # Also build the sdist and pure-Python fallback wheel
-          rm -rf langgraph_cli/bin
-          uv build
-          echo "All wheels built:"
-          ls -lh dist/
-
-      # -- Standard build (all other packages) --
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
       # The release stage has trusted publishing and GitHub repo contents write access,
@@ -112,7 +46,6 @@ jobs:
       # > from the publish job.
       # https://github.com/pypa/gh-action-pypi-publish#non-goals
       - name: Build project for distribution
-        if: inputs.working-directory != 'libs/cli'
         run: uv build
         working-directory: ${{ inputs.working-directory }}
 
@@ -308,13 +241,6 @@ jobs:
         run: make test
         working-directory: ${{ inputs.working-directory }}
 
-      - name: Run Go CLI smoke tests
-        if: inputs.working-directory == 'libs/cli'
-        working-directory: ${{ inputs.working-directory }}
-        env:
-          LANGGRAPH_USE_GO_CLI: "1"
-        run: uv run pytest tests/unit_tests/test_go_cli_smoke.py
-
   publish:
     needs:
       - build

.gitignore

@@ -100,3 +100,4 @@ dmypy.json
 .turbo
 .editorconfig
 .scratch
+.worktrees/

libs/checkpoint-conformance/langgraph/checkpoint/conformance/spec/test_list.py

@@ -339,7 +339,6 @@ async def test_list_metadata_custom_keys(
     assert results[0].metadata["run_id"] == "run-abc"
 
 
-
 ALL_LIST_TESTS = [
     test_list_all,
     test_list_by_thread,

libs/checkpoint-conformance/uv.lock

@@ -231,7 +231,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.22"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -243,9 +243,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/a3/c4cd6827a1df46c821e7214b7f7b7a28b189e6c9b84ef15c6d629c5e3179/langchain_core-1.2.22.tar.gz", hash = "sha256:8d8f726d03d3652d403da915126626bb6250747e8ba406537d849e68b9f5d058", size = 842487, upload-time = "2026-03-24T18:48:44.9Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c7/a6/2ffacf0f1a3788f250e75d0b52a24896c413be11be3a6d42bcdf46fbea48/langchain_core-1.2.22-py3-none-any.whl", hash = "sha256:7e30d586b75918e828833b9ec1efc25465723566845dd652c277baf751e9c04b", size = 506829, upload-time = "2026-03-24T18:48:43.286Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]
 
 [[package]]
@@ -263,7 +263,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint-conformance"
-version = "0.0.1"
+version = "0.0.2"
 source = { editable = "." }
 dependencies = [
     { name = "langgraph-checkpoint" },
@@ -306,7 +306,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.7.3"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -319,9 +319,9 @@ dependencies = [
     { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/8d/bc/8172fefad4f2da888a6d564a27d1fb7d4dbf3c640899c2b40c46235cbe98/langsmith-0.7.3.tar.gz", hash = "sha256:0223b97021af62d2cf53c8a378a27bd22e90a7327e45b353e0069ae60d5d6f9e", size = 988575, upload-time = "2026-02-13T23:25:32.916Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f4/9d/5a68b6b5e313ffabbb9725d18a71edb48177fd6d3ad329c07801d2a8e862/langsmith-0.7.3-py3-none-any.whl", hash = "sha256:03659bf9274e6efcead361c9c31a7849ea565ae0d6c0d73e1d8b239029eff3be", size = 325718, upload-time = "2026-02-13T23:25:31.52Z" },
+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [[package]]
@@ -623,7 +623,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "9.0.2"
+version = "9.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -634,9 +634,9 @@ dependencies = [
     { name = "pygments" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
+    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
 ]
 
 [[package]]

libs/checkpoint-postgres/README.md

@@ -6,6 +6,11 @@ Implementation of LangGraph CheckpointSaver that uses Postgres.
 
 By default `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) without any extras. However, you can choose a specific installation that best suits your needs [here](https://www.psycopg.org/psycopg3/docs/basic/install.html) (for example, `psycopg[binary]`).
 
+## Security
+
+> [!IMPORTANT]
+> Set `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the [langgraph-checkpoint README](https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint#serde) for details.
+
 ## Usage
 
 > [!IMPORTANT]

libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py

@@ -4,15 +4,17 @@ import threading
 from collections import defaultdict
 from collections.abc import Iterator, Sequence
 from contextlib import contextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     WRITES_IDX_MAP,
     ChannelVersions,
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    _ChannelWritesHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
@@ -23,7 +25,11 @@ from psycopg.types.json import Jsonb
 from psycopg_pool import ConnectionPool
 
 from langgraph.checkpoint.postgres import _internal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    SELECT_DELTA_COMBINED_SQL,
+    BasePostgresSaver,
+    _DeltaCombinedRow,
+)
 from langgraph.checkpoint.postgres.shallow import ShallowPostgresSaver
 
 Conn = _internal.Conn  # For backward compatibility
@@ -430,6 +436,48 @@ class PostgresSaver(BasePostgresSaver):
                 with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    def _get_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        """Fast-path override of `BaseCheckpointSaver._get_channel_writes_history`.
+
+        One combined UNION ALL query (`SELECT_DELTA_COMBINED_SQL`) fetches rows
+        from `checkpoints`, `checkpoint_writes`, and `checkpoint_blobs` in a
+        single roundtrip; the ancestor walk runs in Python.
+        """
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            # Caller didn't specify a target — resolve to the latest
+            # checkpoint on the thread. `get_tuple` without `checkpoint_id`
+            # returns the newest; its config carries the resolved id.
+            target = self.get_tuple(config)
+            if target is None:
+                return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=[])
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+        with self._cursor() as cur:
+            cur.execute(
+                SELECT_DELTA_COMBINED_SQL,
+                (
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                ),
+            )
+            rows = cur.fetchall()
+        return self._build_delta_channel_writes_history(
+            channel=channel,
+            target_id=checkpoint_id,
+            rows=cast("list[_DeltaCombinedRow]", rows),
+        )
+
     def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.

libs/checkpoint-postgres/langgraph/checkpoint/postgres/aio.py

@@ -4,15 +4,17 @@ import asyncio
 from collections import defaultdict
 from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import asynccontextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     WRITES_IDX_MAP,
     ChannelVersions,
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    _ChannelWritesHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
@@ -23,7 +25,11 @@ from psycopg.types.json import Jsonb
 from psycopg_pool import AsyncConnectionPool
 
 from langgraph.checkpoint.postgres import _ainternal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    SELECT_DELTA_COMBINED_SQL,
+    BasePostgresSaver,
+    _DeltaCombinedRow,
+)
 from langgraph.checkpoint.postgres.shallow import AsyncShallowPostgresSaver
 
 Conn = _ainternal.Conn  # For backward compatibility
@@ -391,6 +397,46 @@ class AsyncPostgresSaver(BasePostgresSaver):
                 async with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    async def _aget_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        """Fast-path override of `BaseCheckpointSaver._aget_channel_writes_history`.
+
+        One combined UNION ALL query (`SELECT_DELTA_COMBINED_SQL`) fetches rows
+        from `checkpoints`, `checkpoint_writes`, and `checkpoint_blobs` in a
+        single roundtrip; rows are assembled by the shared pure helper on
+        `BasePostgresSaver`.
+        """
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = await self.aget_tuple(config)
+            if target is None:
+                return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=[])
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+        async with self._cursor() as cur:
+            await cur.execute(
+                SELECT_DELTA_COMBINED_SQL,
+                (
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                ),
+            )
+            rows = await cur.fetchall()
+        return self._build_delta_channel_writes_history(
+            channel=channel,
+            target_id=checkpoint_id,
+            rows=cast("list[_DeltaCombinedRow]", rows),
+        )
+
     async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.

libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py

@@ -4,13 +4,16 @@ import random
 import warnings
 from collections.abc import Sequence
 from importlib.metadata import version as get_version
-from typing import Any, cast
+from typing import Any, TypedDict, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     WRITES_IDX_MAP,
     BaseCheckpointSaver,
     ChannelVersions,
+    PendingWrite,
+    _ChannelWritesHistory,
     get_checkpoint_id,
 )
 from langgraph.checkpoint.serde.types import TASKS
@@ -153,6 +156,62 @@ INSERT_CHECKPOINT_WRITES_SQL = """
 """
 
 
+class _DeltaCombinedRow(TypedDict, total=False):
+    """One row from `SELECT_DELTA_COMBINED_SQL` (a UNION ALL of three tables).
+
+    Every row carries `_kind` ("p" / "w" / "b") plus whichever columns are
+    relevant for that kind; irrelevant columns are NULL and typed as `None`.
+    """
+
+    _kind: str  # always present: "p", "w", or "b"
+    # checkpoint row ("p")
+    checkpoint_id: str | None
+    parent_checkpoint_id: str | None
+    ver: str | None
+    # write / blob rows ("w", "b")
+    type: str | None
+    blob: bytes | None
+    # write row only ("w")
+    task_id: str | None
+    idx: int | None
+    # blob row only ("b")
+    version: str | None
+
+
+# DeltaChannel reconstruction: one UNION ALL query fetches checkpoints,
+# writes, and blobs for `channel` in one roundtrip; the ancestor walk runs
+# in Python in `_build_delta_channel_writes_history`.
+#
+# Parameter order: (channel, thread_id, checkpoint_ns,
+#                   thread_id, checkpoint_ns, channel,
+#                   thread_id, checkpoint_ns, channel)
+SELECT_DELTA_COMBINED_SQL = """
+    SELECT 'p'::text       AS _kind,
+           checkpoint_id,
+           parent_checkpoint_id,
+           checkpoint -> 'channel_versions' ->> %s AS ver,
+           NULL::text       AS type,
+           NULL::bytea      AS blob,
+           NULL::text       AS task_id,
+           NULL::int        AS idx,
+           NULL::text       AS version
+    FROM checkpoints
+    WHERE thread_id = %s AND checkpoint_ns = %s
+    UNION ALL
+    SELECT 'w',
+           checkpoint_id, NULL, NULL,
+           type, blob, task_id, idx, NULL
+    FROM checkpoint_writes
+    WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s
+    UNION ALL
+    SELECT 'b',
+           NULL, NULL, NULL,
+           type, blob, NULL, NULL, version
+    FROM checkpoint_blobs
+    WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s
+"""
+
+
 class BasePostgresSaver(BaseCheckpointSaver[str]):
     SELECT_SQL = SELECT_SQL
     SELECT_PENDING_SENDS_SQL = SELECT_PENDING_SENDS_SQL
@@ -195,6 +254,83 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
             if t.decode() != "empty"
         }
 
+    def _build_delta_channel_writes_history(
+        self,
+        *,
+        channel: str,
+        target_id: str,
+        rows: Sequence[_DeltaCombinedRow],
+    ) -> _ChannelWritesHistory:
+        """Reconstruct one delta channel's history from the combined UNION ALL rows.
+
+        Pure data transform shared by sync (`PostgresSaver`) and async
+        (`AsyncPostgresSaver`); both paths run `SELECT_DELTA_COMBINED_SQL`
+        and feed the tagged rows here.
+
+        Walk is newest → oldest from the target's parent. A non-sentinel
+        blob in `checkpoint_blobs` (a pre-delta snapshot) terminates the
+        walk and is returned as the seed so replay starts from it.
+
+        Writes stored at `target_id` itself are pending writes for the next
+        step and are excluded — the walk begins at the target's parent.
+        """
+        parent_of: dict[str, str | None] = {}
+        ver_of: dict[str, str | None] = {}
+        writes_by_cid: dict[str, list[tuple[str, bytes, str, int]]] = {}
+        blob_by_ver: dict[str, tuple[str, bytes]] = {}
+
+        for r in rows:
+            kind = r["_kind"]
+            if kind == "p":
+                cid = cast(str, r["checkpoint_id"])
+                parent_of[cid] = r["parent_checkpoint_id"]
+                ver_of[cid] = r["ver"]
+            elif kind == "w":
+                cid = cast(str, r["checkpoint_id"])
+                writes_by_cid.setdefault(cid, []).append(
+                    cast(
+                        "tuple[str, bytes, str, int]",
+                        (r["type"], r["blob"], r["task_id"], r["idx"]),
+                    )
+                )
+            else:  # kind == "b"
+                blob_by_ver[cast(str, r["version"])] = cast(
+                    "tuple[str, bytes]", (r["type"], r["blob"])
+                )
+
+        # newest write first per ancestor (task_id DESC, idx DESC)
+        for ws in writes_by_cid.values():
+            ws.sort(key=lambda w: (w[2], w[3]), reverse=True)
+
+        ancestors: list[str] = []
+        cur_cid: str | None = parent_of.get(target_id)
+        while cur_cid is not None:
+            ancestors.append(cur_cid)
+            cur_cid = parent_of.get(cur_cid)
+        if not ancestors:
+            return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=[])
+
+        collected: list[PendingWrite] = []  # newest first; reversed at the end
+        for cid in ancestors:
+            # Collect writes first — they encode the transition FROM this
+            # ancestor's state to its child's and must be included even if
+            # this ancestor is also the seed checkpoint.
+            for type_tag, write_blob, task_id, _idx in writes_by_cid.get(cid, []):
+                val = self.serde.loads_typed((type_tag, write_blob))
+                collected.append((task_id, channel, val))
+            # Then check seed terminator.
+            ver = ver_of.get(cid)
+            if ver is not None:
+                seed_blob = blob_by_ver.get(ver)
+                if seed_blob is not None and seed_blob[0] != "empty":
+                    blob_value = self.serde.loads_typed(seed_blob)
+                    if blob_value is not DELTA_SENTINEL:
+                        collected.reverse()
+                        return _ChannelWritesHistory(seed=blob_value, writes=collected)
+
+        collected.reverse()  # oldest → newest
+        return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=collected)
+
     def _dump_blobs(
         self,
         thread_id: str,

libs/checkpoint-postgres/pyproject.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=2.1.2,<5.0.0",
+  "langgraph-checkpoint>=4.0.3,<5.0.0",
   "orjson>=3.11.5",
   "psycopg>=3.2.0",
   "psycopg-pool>=3.2.0",

libs/checkpoint-postgres/tests/test_async.py

@@ -361,9 +361,9 @@ async def test_get_checkpoint_no_channel_values(
 
         load_checkpoint_tuple = saver._load_checkpoint_tuple
 
-        def patched_load_checkpoint_tuple(value):
+        async def patched_load_checkpoint_tuple(value):
             value["checkpoint"].pop("channel_values", None)
-            return load_checkpoint_tuple(value)
+            return await load_checkpoint_tuple(value)
 
         monkeypatch.setattr(
             saver, "_load_checkpoint_tuple", patched_load_checkpoint_tuple
@@ -371,3 +371,47 @@ async def test_get_checkpoint_no_channel_values(
 
         checkpoint = await saver.aget_tuple(config)
         assert checkpoint.checkpoint["channel_values"] == {}
+
+
+@pytest.mark.parametrize("saver_name", ["base", "pool", "pipe"])
+async def test_delta_channel_chain_reconstruction(saver_name: str) -> None:
+    """AsyncPostgresSaver reconstructs DeltaChannel chain via point-lookup traversal."""
+    pytest.importorskip(
+        "langgraph.channels.delta", reason="langgraph core not installed"
+    )
+
+    from typing import Annotated
+
+    from langchain_core.messages import AIMessage, HumanMessage
+    from langgraph.channels.delta import DeltaChannel
+    from langgraph.graph import START, StateGraph
+    from langgraph.graph.message import _messages_delta_reducer
+    from typing_extensions import TypedDict
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        n = len(state["messages"])
+        return {"messages": [AIMessage(content=f"reply-{n}", id=f"ai-{n}")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+
+    async with _saver(saver_name) as saver:
+        graph = builder.compile(checkpointer=saver)
+        config = {"configurable": {"thread_id": "diff-channel-test-1"}}
+
+        await graph.ainvoke({"messages": [HumanMessage(content="hi", id="h1")]}, config)
+        await graph.ainvoke(
+            {"messages": [HumanMessage(content="there", id="h2")]}, config
+        )
+
+        state = await graph.aget_state(config)
+        msgs = state.values["messages"]
+        assert len(msgs) == 4, f"expected 4, got {len(msgs)}: {msgs}"
+        assert msgs[0].content == "hi"
+        assert msgs[1].content == "reply-1"
+        assert msgs[2].content == "there"
+        assert msgs[3].content == "reply-3"

libs/checkpoint-postgres/uv.lock

@@ -240,7 +240,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.22"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -252,14 +252,14 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/a3/c4cd6827a1df46c821e7214b7f7b7a28b189e6c9b84ef15c6d629c5e3179/langchain_core-1.2.22.tar.gz", hash = "sha256:8d8f726d03d3652d403da915126626bb6250747e8ba406537d849e68b9f5d058", size = 842487, upload-time = "2026-03-24T18:48:44.9Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c7/a6/2ffacf0f1a3788f250e75d0b52a24896c413be11be3a6d42bcdf46fbea48/langchain_core-1.2.22-py3-none-any.whl", hash = "sha256:7e30d586b75918e828833b9ec1efc25465723566845dd652c277baf751e9c04b", size = 506829, upload-time = "2026-03-24T18:48:43.286Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.0.2"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -382,7 +382,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.6.4"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -392,11 +392,12 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e7/85/9c7933052a997da1b85bc5c774f3865e9b1da1c8d71541ea133178b13229/langsmith-0.6.4.tar.gz", hash = "sha256:36f7223a01c218079fbb17da5e536ebbaf5c1468c028abe070aa3ae59bc99ec8", size = 919964, upload-time = "2026-01-15T20:02:28.873Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/66/0f/09a6637a7ba777eb307b7c80852d9ee26438e2bdafbad6fcc849ff9d9192/langsmith-0.6.4-py3-none-any.whl", hash = "sha256:ac4835860160be371042c7adbba3cb267bcf8d96a5ea976c33a8a4acad6c5486", size = 283503, upload-time = "2026-01-15T20:02:26.662Z" },
+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [[package]]
@@ -950,7 +951,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "9.0.2"
+version = "9.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -961,9 +962,9 @@ dependencies = [
     { name = "pygments" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
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 version = "0.25.0"

libs/checkpoint-sqlite/README.md

@@ -2,6 +2,11 @@
 
 Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)
 
+## Security
+
+> [!IMPORTANT]
+> Set `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the [langgraph-checkpoint README](https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint#serde) for details.
+
 ## Usage
 
 ```python

libs/checkpoint-sqlite/uv.lock

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+]
+
 [[package]]
 name = "zstandard"
 version = "0.25.0"

libs/checkpoint/README.md

@@ -26,6 +26,9 @@ You must pass these when invoking the graph as part of the configurable part of
 
 `langgraph_checkpoint` also defines protocol for serialization/deserialization (serde) and provides an default implementation (`langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer`) that handles a wide variety of types, including LangChain and LangGraph primitives, datetimes, enums and more.
 
+> [!IMPORTANT]
+> **Checkpoint deserialization security:** By default the serializer allows any Python type found in checkpoint data. New applications should set the environment variable `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list to `JsonPlusSerializer` to restrict deserialization to known-safe types.
+
 ### Pending writes
 
 When a graph node fails mid-execution at a given superstep, LangGraph stores pending checkpoint writes from any other nodes that completed successfully at that superstep, so that whenever we resume graph execution from that superstep we don't re-run the successful nodes.

libs/checkpoint/langgraph/checkpoint/base/__init__.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import copy
 import logging
 from collections.abc import AsyncIterator, Collection, Iterator, Mapping, Sequence
-from typing import (  # noqa: UP035
+from typing import (
     Any,
     Generic,
     Literal,
@@ -18,6 +18,9 @@ from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_methods
 from langgraph.checkpoint.serde.encrypted import EncryptedSerializer
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+from langgraph.checkpoint.serde.types import (
+    DELTA_SENTINEL as DELTA_SENTINEL,
+)
 from langgraph.checkpoint.serde.types import (
     ERROR,
     INTERRUPT,
@@ -28,6 +31,8 @@ from langgraph.checkpoint.serde.types import (
 
 V = TypeVar("V", int, float, str)
 PendingWrite = tuple[str, str, Any]
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -119,6 +124,30 @@ class CheckpointTuple(NamedTuple):
     pending_writes: list[PendingWrite] | None = None
 
 
+class _ChannelWritesHistory(NamedTuple):
+    """Result of `BaseCheckpointSaver._get_channel_writes_history`.
+
+    Storage-level view of what one channel wrote across the ancestor chain
+    of a target checkpoint:
+
+      * `seed` — the nearest ancestor's stored blob value for this channel,
+        or `DELTA_SENTINEL` if the walk reached the root without finding a
+        stored value. A non-sentinel seed typically indicates a pre-delta
+        snapshot preserved across a channel-type migration (e.g.
+        `BinaryOperatorAggregate` storage extended under `DeltaChannel`).
+      * `writes` — on-path deltas oldest→newest, one `PendingWrite` per
+        step that wrote to this channel. Writes stored at the target
+        checkpoint itself are pending for the next super-step and are
+        excluded.
+
+    Experimental: method surface may change; the NamedTuple shape is the
+    contract.
+    """
+
+    seed: Any
+    writes: list[PendingWrite]
+
+
 class BaseCheckpointSaver(Generic[V]):
     """Base class for creating a graph checkpointer.
 
@@ -457,6 +486,104 @@ class BaseCheckpointSaver(Generic[V]):
         """
         raise NotImplementedError
 
+    def _get_tuple_raw(self, config: RunnableConfig) -> CheckpointTuple | None:
+        """Pure storage read used by `_get_channel_writes_history`.
+
+        Must return the same value as `get_tuple` but must NOT trigger channel
+        reconstruction; otherwise the channel-hydration path would re-enter
+        `_get_channel_writes_history`. Override only if `get_tuple` itself
+        performs channel hydration.
+        """
+        return self.get_tuple(config)
+
+    async def _aget_tuple_raw(self, config: RunnableConfig) -> CheckpointTuple | None:
+        """Async version of `_get_tuple_raw`. See docstring there."""
+        return await self.aget_tuple(config)
+
+    def _get_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        """**Experimental.** Query one channel's writes along the parent chain.
+
+        Storage-level query, not channel semantics: returns `(seed, writes)`
+        reflecting what storage knows about a single channel across the
+        ancestor chain of the target checkpoint identified by `config`.
+
+        * `writes` — on-path deltas oldest→newest as `PendingWrite` tuples.
+          Writes stored at the target `checkpoint_id` itself are pending
+          for the next super-step and are excluded.
+        * `seed` — the nearest ancestor's stored blob value for this
+          channel; `DELTA_SENTINEL` if the walk reached the root without
+          finding a stored value. A non-sentinel seed typically indicates
+          a pre-delta snapshot preserved across a channel-type migration.
+
+        Walks the **parent chain** (not `list(before=...)`): for forked
+        threads, only on-path ancestors contribute.
+
+        Reference implementation walks `get_tuple` + `parent_config`,
+        inspecting each ancestor's `channel_values[channel]` for the seed
+        terminator. Savers with direct storage access (`InMemorySaver`,
+        `PostgresSaver`) override for performance; the return contract is
+        fixed here.
+
+        Underscore-prefixed because the method surface is experimental.
+        """
+        collected: list[PendingWrite] = []  # newest first; reversed at the end
+        target_tuple = self._get_tuple_raw(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None:
+            tup = self._get_tuple_raw(cursor_config)
+            if tup is None:
+                break
+            # Collect this ancestor's writes FIRST — they encode the
+            # transition from this ancestor's state to its child's, so
+            # they must be included whether or not this ancestor is the
+            # seed terminator.
+            if tup.pending_writes:
+                # Within a superstep, pending_writes are oldest→newest;
+                # reverse to scan newest-first.
+                for write in reversed(tup.pending_writes):
+                    if write[1] != channel:
+                        continue
+                    collected.append(write)
+            # Seed terminator: any non-sentinel blob on an ancestor
+            # establishes the reconstruction base. Stop here.
+            ancestor_value = tup.checkpoint["channel_values"].get(channel)
+            if ancestor_value is not None and ancestor_value is not DELTA_SENTINEL:
+                collected.reverse()
+                return _ChannelWritesHistory(seed=ancestor_value, writes=collected)
+            cursor_config = tup.parent_config
+        collected.reverse()
+        return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=collected)
+
+    async def _aget_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        """Async version of `_get_channel_writes_history`. See docstring there."""
+        collected: list[PendingWrite] = []
+        target_tuple = await self._aget_tuple_raw(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None:
+            tup = await self._aget_tuple_raw(cursor_config)
+            if tup is None:
+                break
+            if tup.pending_writes:
+                for write in reversed(tup.pending_writes):
+                    if write[1] != channel:
+                        continue
+                    collected.append(write)
+            ancestor_value = tup.checkpoint["channel_values"].get(channel)
+            if ancestor_value is not None and ancestor_value is not DELTA_SENTINEL:
+                collected.reverse()
+                return _ChannelWritesHistory(seed=ancestor_value, writes=collected)
+            cursor_config = tup.parent_config
+        collected.reverse()
+        return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=collected)
+
     def get_next_version(self, current: V | None, channel: None) -> V:
         """Generate the next version ID for a channel.
 

libs/checkpoint/langgraph/checkpoint/memory/__init__.py

@@ -14,16 +14,20 @@ from typing import Any
 from langchain_core.runnables import RunnableConfig
 
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     WRITES_IDX_MAP,
     BaseCheckpointSaver,
     ChannelVersions,
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    PendingWrite,
     SerializerProtocol,
+    _ChannelWritesHistory,
     get_checkpoint_id,
     get_checkpoint_metadata,
 )
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 
 logger = logging.getLogger(__name__)
 
@@ -121,16 +125,114 @@ class InMemorySaver(
         return self.stack.__exit__(__exc_type, __exc_value, __traceback)
 
     def _load_blobs(
-        self, thread_id: str, checkpoint_ns: str, versions: ChannelVersions
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        versions: ChannelVersions,
     ) -> dict[str, Any]:
-        channel_values: dict[str, Any] = {}
-        for k, v in versions.items():
-            kk = (thread_id, checkpoint_ns, k, v)
-            if kk in self.blobs:
-                vv = self.blobs[kk]
-                if vv[0] != "empty":
-                    channel_values[k] = self.serde.loads_typed(vv)
-        return channel_values
+        result: dict[str, Any] = {}
+        for k, ver in versions.items():
+            kk = (thread_id, checkpoint_ns, k, ver)
+            if kk not in self.blobs:
+                continue
+            vv = self.blobs[kk]
+            if vv[0] == "empty":
+                continue
+            result[k] = self.serde.loads_typed(vv)
+        return result
+
+    def _get_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = config["configurable"].get("checkpoint_id", "")
+        ns_storage = self.storage.get(thread_id, {}).get(checkpoint_ns, {})
+        # Walk the parent chain newest→oldest. Skip the target itself —
+        # writes stored AT `checkpoint_id` are pending for the next step
+        # (pregel applies them via `apply_writes`; they aren't part of the
+        # snapshot value AT `checkpoint_id`).
+        chain: list[str] = []
+        target_entry = ns_storage.get(checkpoint_id)
+        current: str | None = target_entry[2] if target_entry is not None else None
+        while current is not None:
+            entry = ns_storage.get(current)
+            if entry is None:
+                break
+            chain.append(current)
+            _, _, parent = entry
+            current = parent
+        # Scan newest→oldest. A pre-delta blob on an ancestor terminates the
+        # walk and is bound as `seed`; without this, a thread migrated from
+        # pre-delta storage would replay ancestor writes all the way to the
+        # root AND miss any value that lived only in the old blob (e.g. from
+        # `update_state`).
+        #
+        # At each ancestor, check the blob BEFORE processing its pending
+        # writes: a pre-delta blob represents the state AT that ancestor,
+        # which already subsumes any writes stored under it. Processing
+        # those writes first would fold them into the reconstructed value
+        # twice (once via the blob, once via replay).
+        collected: list[PendingWrite] = []  # newest first
+        for cp_id in chain:  # newest → oldest
+            entry = ns_storage.get(cp_id)
+            if entry is not None:
+                ckpt = self.serde.loads_typed(entry[0])
+                ver = ckpt.get("channel_versions", {}).get(channel)
+                if ver is not None:
+                    blob_entry = self.blobs.get(
+                        (thread_id, checkpoint_ns, channel, ver)
+                    )
+                    if blob_entry is not None and blob_entry[0] != "empty":
+                        blob_value = self.serde.loads_typed(blob_entry)
+                        if blob_value is not DELTA_SENTINEL:
+                            if isinstance(blob_value, _DeltaSnapshot):
+                                # Step-based snapshot: the blob is state AT this
+                                # ancestor, but the ancestor's pending_writes
+                                # encode the NEXT step's transition and are NOT
+                                # subsumed by the snapshot — collect them first.
+                                step_writes = self.writes.get(
+                                    (thread_id, checkpoint_ns, cp_id), {}
+                                )
+                                for (_task_id, _idx), (
+                                    tid,
+                                    ch,
+                                    serialized,
+                                    _,
+                                ) in sorted(step_writes.items(), reverse=True):
+                                    if ch != channel:
+                                        continue
+                                    collected.append(
+                                        (tid, ch, self.serde.loads_typed(serialized))
+                                    )
+                                collected.reverse()
+                                return _ChannelWritesHistory(
+                                    seed=blob_value, writes=collected
+                                )
+                            # Pre-delta blob: state AT this ancestor already
+                            # subsumes its pending_writes — skip them.
+                            collected.reverse()
+                            return _ChannelWritesHistory(
+                                seed=blob_value, writes=collected
+                            )
+
+            step_writes = self.writes.get((thread_id, checkpoint_ns, cp_id), {})
+            # Within a superstep, sorted by (task_id, idx) = oldest → newest;
+            # reverse for newest-first scan.
+            for (_task_id, _idx), (tid, ch, serialized, _) in sorted(
+                step_writes.items(), reverse=True
+            ):
+                if ch != channel:
+                    continue
+                val = self.serde.loads_typed(serialized)
+                collected.append((tid, ch, val))
+        collected.reverse()
+        return _ChannelWritesHistory(seed=DELTA_SENTINEL, writes=collected)
+
+    async def _aget_channel_writes_history(
+        self, config: RunnableConfig, channel: str
+    ) -> _ChannelWritesHistory:
+        return self._get_channel_writes_history(config, channel)
 
     def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the in-memory storage.

libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py

@@ -1,3 +1,10 @@
+"""Msgpack deserialization safety controls.
+
+Set ``LANGGRAPH_STRICT_MSGPACK=true`` to restrict checkpoint deserialization
+to the types listed in ``SAFE_MSGPACK_TYPES``.  Without this, any Python
+callable stored in checkpoint data will be imported and executed on load.
+"""
+
 import os
 from collections.abc import Iterable
 from typing import cast

libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py

@@ -33,19 +33,40 @@ from langchain_core.load.load import Reviver
 from langgraph.checkpoint.serde import _msgpack as _lg_msgpack
 from langgraph.checkpoint.serde.base import SerializerProtocol
 from langgraph.checkpoint.serde.event_hooks import emit_serde_event
-from langgraph.checkpoint.serde.types import SendProtocol
+from langgraph.checkpoint.serde.types import (
+    DELTA_SENTINEL,
+    SendProtocol,
+    _DeltaSentinel,
+    _DeltaSnapshot,
+)
 from langgraph.store.base import Item
 
 if TYPE_CHECKING:
     from langgraph.checkpoint.serde._msgpack import (
         AllowedMsgpackModules,
     )
-    from langgraph.checkpoint.serde.types import SendProtocol
 
 LC_REVIVER = Reviver()
 EMPTY_BYTES = b""
 logger = logging.getLogger(__name__)
 
+# Dedup log warnings across process lifetime; cap bounds state if types are
+# dynamically generated (also acts as a circuit breaker on warning volume).
+# Dedup is best-effort: racing threads may each emit once for the same key,
+# and warnings are silently dropped once _MAX_WARNED_TYPES is reached.
+_MAX_WARNED_TYPES = 1000
+_warned_unregistered_types: set[tuple[str, str]] = set()
+_warned_blocked_types: set[tuple[str, str]] = set()
+
+
+def _warn_once(
+    seen: set[tuple[str, str]], key: tuple[str, str], msg: str, *args: object
+) -> None:
+    if key in seen or len(seen) >= _MAX_WARNED_TYPES:
+        return
+    seen.add(key)
+    logger.warning(msg, *args)
+
 
 class JsonPlusSerializer(SerializerProtocol):
     """Serializer that uses ormsgpack, with optional fallbacks.
@@ -56,6 +77,10 @@ class JsonPlusSerializer(SerializerProtocol):
         class and called within the Pregel loop. It should not be used on untrusted
         python objects. If an attacker can write directly to your checkpoint database,
         they may be able to trigger code execution when data is deserialized.
+
+        Set the environment variable ``LANGGRAPH_STRICT_MSGPACK=true`` to restrict
+        deserialization to a built-in allowlist of safe types.  You can also pass
+        an explicit ``allowed_msgpack_modules`` to the constructor.
     """
 
     def __init__(
@@ -70,8 +95,11 @@ class JsonPlusSerializer(SerializerProtocol):
     ) -> None:
         if allowed_msgpack_modules is _lg_msgpack._SENTINEL:
             if _lg_msgpack.STRICT_MSGPACK_ENABLED:
+                # Strict: only SAFE_MSGPACK_TYPES are allowed.
                 allowed_msgpack_modules = None
             else:
+                # Permissive (default): all types allowed with a warning.
+                # Set LANGGRAPH_STRICT_MSGPACK=true to lock this down.
                 allowed_msgpack_modules = True
         self.pickle_fallback = pickle_fallback
         self._allowed_json_modules: set[tuple[str, ...]] | Literal[True] | None = (
@@ -269,10 +297,16 @@ EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
 EXT_NUMPY_ARRAY = 6
+EXT_DELTA_SNAPSHOT = 7
+EXT_DELTA_SENTINEL = 8
 
 
 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
-    if hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
+    if isinstance(obj, _DeltaSnapshot):
+        return ormsgpack.Ext(EXT_DELTA_SNAPSHOT, _msgpack_enc(obj.value))
+    elif isinstance(obj, _DeltaSentinel):
+        return ormsgpack.Ext(EXT_DELTA_SENTINEL, b"")
+    elif hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
         return ormsgpack.Ext(
             EXT_PYDANTIC_V2,
             _msgpack_enc(
@@ -527,10 +561,13 @@ def _create_msgpack_ext_hook(
                     "name": name,
                 }
             )
-            logger.warning(
+            _warn_once(
+                _warned_unregistered_types,
+                key,
                 "Deserializing unregistered type %s.%s from checkpoint. "
                 "This will be blocked in a future version. "
-                "Add to allowed_msgpack_modules to silence: [(%r, %r)]",
+                "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
+                "to allowed_msgpack_modules to allow explicitly: [(%r, %r)]",
                 module,
                 name,
                 module,
@@ -548,7 +585,9 @@ def _create_msgpack_ext_hook(
                 "name": name,
             }
         )
-        logger.warning(
+        _warn_once(
+            _warned_blocked_types,
+            key,
             "Blocked deserialization of %s.%s - not in allowed_msgpack_modules. "
             "Add to allowed_msgpack_modules to allow: [(%r, %r)]",
             module,
@@ -581,7 +620,15 @@ def _create_msgpack_ext_hook(
         return False
 
     def ext_hook(code: int, data: bytes) -> Any:
-        if code == EXT_CONSTRUCTOR_SINGLE_ARG:
+        if code == EXT_DELTA_SENTINEL:
+            return DELTA_SENTINEL
+        elif code == EXT_DELTA_SNAPSHOT:
+            return _DeltaSnapshot(
+                ormsgpack.unpackb(
+                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+                )
+            )
+        elif code == EXT_CONSTRUCTOR_SINGLE_ARG:
             try:
                 tup = ormsgpack.unpackb(
                     data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS

libs/checkpoint/langgraph/checkpoint/serde/types.py

@@ -1,6 +1,7 @@
 from collections.abc import Sequence
 from typing import (
     Any,
+    NamedTuple,
     Protocol,
     TypeVar,
     runtime_checkable,
@@ -14,6 +15,39 @@ INTERRUPT = "__interrupt__"
 RESUME = "__resume__"
 TASKS = "__pregel_tasks"
 
+
+class _DeltaSentinel:
+    """Singleton marker stored (as zero bytes) in checkpoint_blobs for a
+    DeltaChannel field. The actual per-step writes live in checkpoint_writes
+    and are replayed through the reducer at load time.
+
+    Compare with `is DELTA_SENTINEL` — `loads_typed` always returns the same
+    module-level instance.
+    """
+
+    __slots__ = ()
+
+    def __repr__(self) -> str:
+        return "DELTA_SENTINEL"
+
+
+DELTA_SENTINEL = _DeltaSentinel()
+
+
+class _DeltaSnapshot(NamedTuple):
+    """Snapshot blob for a DeltaChannel with finite snapshot_frequency.
+
+    Stored in checkpoint_blobs via the `EXT_DELTA_SNAPSHOT` msgpack ext code.
+    The ancestor walk in `_get_channel_writes_history` terminates when it
+    encounters this type (any non-sentinel blob stops the walk).
+
+    `from_checkpoint` reconstructs the channel value directly from `.value`
+    without replaying writes — the snapshot IS the accumulated state.
+    """
+
+    value: Any
+
+
 Value = TypeVar("Value", covariant=True)
 Update = TypeVar("Update", contravariant=True)
 C = TypeVar("C")

libs/checkpoint/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.1.0a2"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"

libs/checkpoint/tests/test_encrypted.py

@@ -29,6 +29,8 @@ from langgraph.checkpoint.serde.jsonplus import (
     EXT_METHOD_SINGLE_ARG,
     JsonPlusSerializer,
     _msgpack_enc,
+    _warned_blocked_types,
+    _warned_unregistered_types,
 )
 
 
@@ -102,6 +104,13 @@ def test_msgpack_method_pathlib_blocked_encrypted_strict(
 class TestEncryptedSerializerMsgpackAllowlist:
     """Test msgpack allowlist behavior through EncryptedSerializer."""
 
+    @pytest.fixture(autouse=True)
+    def _reset_warned_types(self) -> None:
+        # Warning dedup state is process-global; reset per-test so each case
+        # sees a fresh slate and assertions about warning emission are stable.
+        _warned_unregistered_types.clear()
+        _warned_blocked_types.clear()
+
     def test_safe_types_no_warning(self, caplog: pytest.LogCaptureFixture) -> None:
         """Test safe types deserialize without warnings through encryption."""
         serde = _make_encrypted_serde()

libs/checkpoint/tests/test_jsonplus.py

@@ -35,6 +35,8 @@ from langgraph.checkpoint.serde.jsonplus import (
     JsonPlusSerializer,
     _msgpack_enc,
     _msgpack_ext_hook_to_json,
+    _warned_blocked_types,
+    _warned_unregistered_types,
 )
 from langgraph.store.base import Item
 
@@ -580,6 +582,14 @@ def test_msgpack_safe_types_no_warning(caplog: pytest.LogCaptureFixture) -> None
         assert result is not None
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) -> None:
     """Pydantic models not in allowlist should log warning but still deserialize."""
     current = _lg_msgpack.STRICT_MSGPACK_ENABLED
@@ -595,6 +605,12 @@ def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) ->
     assert "unregistered type" in caplog.text.lower()
     assert "allowed_msgpack_modules" in caplog.text
     assert result == obj
+
+    # Second deserialization of the same type should NOT produce another warning
+    caplog.clear()
+    result2 = serde.loads_typed(dumped)
+    assert "unregistered type" not in caplog.text.lower()
+    assert result2 == obj
     _lg_msgpack.STRICT_MSGPACK_ENABLED = current
 
 
@@ -639,7 +655,6 @@ def test_msgpack_allowlist_silences_warning(caplog: pytest.LogCaptureFixture) ->
 
 def test_msgpack_none_blocks_unregistered(caplog: pytest.LogCaptureFixture) -> None:
     """allowed_msgpack_modules=None should block unregistered types."""
-
     serde = JsonPlusSerializer(allowed_msgpack_modules=None)
 
     obj = MyPydantic(foo="test", bar=42, inner=InnerPydantic(hello="world"))
@@ -657,7 +672,6 @@ def test_msgpack_allowlist_blocks_non_listed(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Allowlists should block unregistered types even if msgpack is enabled."""
-
     serde = JsonPlusSerializer(
         allowed_msgpack_modules=[("tests.test_jsonplus", "MyPydantic")]
     )
@@ -983,3 +997,15 @@ def test_msgpack_nested_pydantic_serializes_as_dict(
     # No blocking should occur - inner is serialized as dict, not ext
     assert "blocked" not in caplog.text.lower()
     assert result == obj
+
+
+def test_delta_sentinel_serde_round_trip() -> None:
+    from langgraph.checkpoint.base import DELTA_SENTINEL
+    from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+
+    serde = JsonPlusSerializer()
+    type_tag, blob = serde.dumps_typed(DELTA_SENTINEL)
+    assert type_tag == "msgpack"
+    assert blob  # non-empty ext envelope
+    loaded = serde.loads_typed((type_tag, blob))
+    assert loaded is DELTA_SENTINEL

libs/checkpoint/tests/test_memory.py

@@ -6,19 +6,32 @@ from langchain_core.runnables import RunnableConfig
 from pydantic import BaseModel
 
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     Checkpoint,
     CheckpointMetadata,
     create_checkpoint,
     empty_checkpoint,
 )
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+from langgraph.checkpoint.serde.jsonplus import (
+    JsonPlusSerializer,
+    _warned_blocked_types,
+    _warned_unregistered_types,
+)
 
 
 class MemoryPydantic(BaseModel):
     foo: str
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 class TestMemorySaver:
     @pytest.fixture(autouse=True)
     def setup(self) -> None:
@@ -196,8 +209,6 @@ class TestMemorySaver:
 
 
 async def test_memory_saver() -> None:
-    from langgraph.checkpoint.memory import InMemorySaver
-
     memory_saver = InMemorySaver()
     assert isinstance(memory_saver, InMemorySaver)
 
@@ -308,3 +319,347 @@ def test_memory_saver_with_allowlist_proxy_isolated() -> None:
     assert direct is not None
     expected = obj.model_dump() if hasattr(obj, "model_dump") else obj.dict()
     assert direct.checkpoint["channel_values"]["foo"] == expected
+
+
+class TestInMemorySaverDeltaChannel:
+    def test_load_blobs_returns_sentinel_for_delta_channel(self) -> None:
+        """_load_blobs returns DELTA_SENTINEL for delta channels (reconstruction deferred)."""
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+
+        thread_id, ns, channel = "t1", "", "messages"
+        v1 = "00000000000000000000000000000001.0000000000000000"
+
+        saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(DELTA_SENTINEL)
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp1["channel_versions"][channel] = v1
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+        }
+
+        result = saver._load_blobs(thread_id, ns, {channel: v1})
+        assert channel in result
+        assert result[channel] is DELTA_SENTINEL
+
+    def test_get_channel_writes_collects_ancestor_writes_only(self) -> None:
+        """_get_channel_writes_history collects ancestor writes oldest→newest,
+        and excludes writes stored at the target checkpoint itself (those are
+        pending writes for the next step, applied separately by pregel)."""
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+        }
+        # Writes stored at cp1 produced the cp1 snapshot; part of history.
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "hi"}),
+            "",
+        )
+        # Writes stored at cp2 are pending — they will produce cp3 when the
+        # step that loaded cp2 completes. They MUST NOT appear in the
+        # reconstructed snapshot value at cp2.
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp2",
+            }
+        }
+        result = saver._get_channel_writes_history(config, channel)
+        assert result.seed is DELTA_SENTINEL
+        values = [v for _, _, v in result.writes]
+        assert values == [{"content": "hi"}]
+
+    def test_get_channel_writes_at_root_returns_empty(self) -> None:
+        """Reconstructing the root checkpoint's state: no ancestors → []."""
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+        }
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp1",
+            }
+        }
+        result = saver._get_channel_writes_history(config, channel)
+        assert result.seed is DELTA_SENTINEL
+        assert result.writes == []
+
+
+class TestBaseFallbackGetChannelWrites:
+    """Exercises the `BaseCheckpointSaver._get_channel_writes_history` default
+    implementation — the path third-party savers inherit when they don't
+    override `_get_channel_writes_history` themselves.
+
+    Regression guard for a bug where the fallback passed the caller's config
+    (with `checkpoint_id`) straight to `self.list()`, which most savers
+    collapse to a single row — causing the fallback to return `[]`.
+    """
+
+    def _build_saver_with_chain(self) -> tuple[InMemorySaver, str, str]:
+        """Build an InMemorySaver with a 3-checkpoint chain and per-step writes
+        for a `messages` channel.
+
+        Returns `(saver, thread_id, namespace)`. The saver subclass deletes the
+        InMemorySaver override so the base class fallback is exercised.
+        """
+
+        class _ThirdPartyStyleSaver(InMemorySaver):
+            _get_channel_writes_history = (
+                InMemorySaver.__mro__[1]._get_channel_writes_history  # type: ignore[attr-defined]
+            )
+            _aget_channel_writes_history = (
+                InMemorySaver.__mro__[1]._aget_channel_writes_history  # type: ignore[attr-defined]
+            )
+
+        saver = _ThirdPartyStyleSaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp0 = empty_checkpoint()
+        cp0["id"] = "00000000000000000000000000000001.0000000000000000"
+        cp1 = empty_checkpoint()
+        cp1["id"] = "00000000000000000000000000000002.0000000000000000"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "00000000000000000000000000000003.0000000000000000"
+        saver.storage[thread_id][ns] = {
+            cp0["id"]: (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
+            cp1["id"]: (serde.dumps_typed(cp1), serde.dumps_typed({}), cp0["id"]),
+            cp2["id"]: (serde.dumps_typed(cp2), serde.dumps_typed({}), cp1["id"]),
+        }
+        # Writes under cp0 produced cp1's state; writes under cp1 produced cp2's.
+        saver.writes[(thread_id, ns, cp0["id"])][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "first"}),
+            "",
+        )
+        saver.writes[(thread_id, ns, cp1["id"])][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "second"}),
+            "",
+        )
+        return saver, thread_id, ns
+
+    def test_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = saver._get_channel_writes_history(config, "messages")
+
+        assert result.seed is DELTA_SENTINEL
+        values = [v for _, _, v in result.writes]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = await saver._aget_channel_writes_history(config, "messages")
+
+        assert result.seed is DELTA_SENTINEL
+        values = [v for _, _, v in result.writes]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_concurrent_tasks_do_not_interfere(self) -> None:
+        """Regression: the re-entrancy guard must be task-local, not thread-local.
+
+        Two concurrent `_aget_channel_writes_history` calls on the same
+        event-loop thread must each see their full reconstructed writes. A
+        `threading.local()` guard would let whichever task set it first
+        short-circuit the other to `writes=[]`.
+        """
+        import asyncio
+
+        saver, thread_id, ns = self._build_saver_with_chain()
+
+        # Force the two tasks to interleave across the `set(True)` boundary:
+        # each `aget_tuple` yields control, so if the guard were thread-local
+        # the second task would observe `active=True` set by the first.
+        orig_aget_tuple = saver.aget_tuple
+
+        async def slow_aget_tuple(config: RunnableConfig) -> Any:
+            await asyncio.sleep(0)
+            return await orig_aget_tuple(config)
+
+        saver.aget_tuple = slow_aget_tuple  # type: ignore[method-assign]
+
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        results = await asyncio.gather(
+            saver._aget_channel_writes_history(config, "messages"),
+            saver._aget_channel_writes_history(config, "messages"),
+        )
+
+        expected_values = [{"content": "first"}, {"content": "second"}]
+        for result in results:
+            assert result.seed is DELTA_SENTINEL
+            values = [v for _, _, v in result.writes]
+            assert values == expected_values
+
+
+class TestPreDeltaBlobTerminator:
+    """Verify the pre-delta blob terminator: when the ancestor walk hits a
+    checkpoint whose blob for the channel is a real value (not
+    DELTA_SENTINEL), reconstruction seeds from it and stops. This guards
+
+      * back-compat: a thread written by pre-delta code, then extended under
+        delta — reconstruction must return the correct value without walking
+        past the last pre-delta ancestor;
+      * perf: without the terminator, every reconstruct-after-migration would
+        walk all the way to the thread root.
+    """
+
+    def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
+        """Three-checkpoint chain: cp1 (pre-delta, blob=[A]), cp2 (delta,
+        write=B), cp3 (delta, write=C). Reconstructing at cp3 must yield
+        seed=[A] + writes=[B, C].
+
+        Returns `(saver, thread_id, ns, channel, cp3_id)`.
+        """
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        v1 = "00000000000000000000000000000001.0"
+        v2 = "00000000000000000000000000000002.0"
+        v3 = "00000000000000000000000000000003.0"
+
+        # Pre-delta: cp1 stored a real blob for the channel.
+        saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(["A"])
+        # Delta-era: cp2 and cp3 store sentinels; real writes in checkpoint_writes.
+        saver.blobs[(thread_id, ns, channel, v2)] = serde.dumps_typed(DELTA_SENTINEL)
+        saver.blobs[(thread_id, ns, channel, v3)] = serde.dumps_typed(DELTA_SENTINEL)
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp1["channel_versions"][channel] = v1
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        cp2["channel_versions"][channel] = v2
+        cp3 = empty_checkpoint()
+        cp3["id"] = "cp3"
+        cp3["channel_versions"][channel] = v3
+
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+            "cp3": (serde.dumps_typed(cp3), serde.dumps_typed({}), "cp2"),
+        }
+        # Write under cp1 would be from the pre-delta era and MUST be ignored
+        # (the blob already captures it). We add one and assert it is not
+        # folded into the reconstructed result.
+        saver.writes[(thread_id, ns, "cp1")][("task0", 0)] = (
+            "task0",
+            channel,
+            serde.dumps_typed("PRE-DELTA-WRITE"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed("B"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp3")][("task3", 0)] = (
+            "task3",
+            channel,
+            serde.dumps_typed("PENDING-AT-TARGET"),
+            "",
+        )
+        return saver, thread_id, ns, channel, "cp3"
+
+    def test_seed_from_pre_delta_ancestor_blob(self) -> None:
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver._get_channel_writes_history(config, channel)
+
+        # Seed came from the pre-delta blob at cp1.
+        assert result.seed == ["A"]
+        # Delta-era writes from cp2 replay through the reducer on top of seed.
+        # cp3 is the target — its own write is pending for the NEXT step and
+        # must be excluded.
+        values = [v for _, _, v in result.writes]
+        assert values == ["B"]
+
+    def test_pre_delta_blob_terminates_walk_before_older_writes(self) -> None:
+        """Writes stored at the pre-delta ancestor itself must not be replayed
+        (the blob subsumes them)."""
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver._get_channel_writes_history(config, channel)
+
+        values = [v for _, _, v in result.writes]
+        # The pre-delta write under cp1 must not appear (the blob subsumes it).
+        assert "PRE-DELTA-WRITE" not in values
+        # And the pending write at the target is never folded in.
+        assert "PENDING-AT-TARGET" not in values

libs/checkpoint/uv.lock

@@ -7,6 +7,9 @@ resolution-markers = [
     "python_full_version < '3.11'",
 ]
 
+[options]
+prerelease-mode = "allow"
+
 [[package]]
 name = "annotated-types"
 version = "0.7.0"
@@ -267,7 +270,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.23"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -279,14 +282,14 @@ dependencies = [
     { name = "typing-extensions" },
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 name = "zstandard"
 version = "0.25.0"

libs/cli/.gitignore

@@ -1,3 +1 @@
 .langgraph_api/
-# Go cross-compiled binaries (built at release time, bundled into wheels)
-langgraph_cli/bin/

libs/cli/GO_MIGRATION.md

@@ -1,374 +0,0 @@
-# Go Migration Plan
-
-## Goal
-
-Move the full `langgraph` CLI implementation to Go while preserving existing
-Python distribution and invocation flows.
-
-Users should continue to be able to run:
-
-- `langgraph ...`
-- `uv run langgraph ...`
-- `uvx langgraph ...`
-
-During phase 1, the Go path is gated behind a feature flag. The Python package
-remains the public entrypoint and launcher.
-
-## Non-Goals
-
-This phase does not include:
-
-- JS migration
-- `langsmith-cli` integration
-- user-facing command renames
-- intentional CLI behavior changes
-- a long-lived dual implementation
-
-## Source Of Truth
-
-There will be one implementation of CLI behavior:
-
-- shared Go implementation lives in the `langgraph` repo
-- standalone Go `langgraph` binary uses that implementation
-- Python `langgraph-cli` package is a thin launcher around that binary
-- legacy Python implementation exists only temporarily as fallback during rollout
-
-## Phase 1 Artifacts
-
-Phase 1 ships these artifacts:
-
-- shared Go package(s) in `langgraph`
-- standalone `langgraph` Go binary
-- Python wheel `langgraph-cli` that bundles the platform-specific Go binary
-- Python launcher entrypoint that can route to legacy Python or Go
-
-JS is explicitly out of scope for phase 1.
-
-## User-Facing Command Scope
-
-Phase 1 scope is the whole `langgraph` CLI, not just deploy.
-
-Target command coverage:
-
-- `langgraph deploy ...`
-- `langgraph build ...`
-- `langgraph up ...`
-- `langgraph dockerfile ...`
-- `langgraph dev ...`
-- `langgraph new ...`
-
-The goal is full parity with the current Python CLI command surface.
-
-## Compatibility Contract
-
-Behavior must not regress.
-
-Required parity:
-
-- exact JSON output where commands emit JSON
-- exact or equivalent error semantics
-- same exit codes
-- same argument and flag behavior
-- same generated artifacts for:
-  - Dockerfile output
-  - docker compose / inline compose output
-- same API request semantics where mocked in tests
-
-Human-readable output should be same or better, but not worse.
-
-## Repo Ownership
-
-Shared implementation lives in the current `langgraph` repo.
-
-Reasons:
-
-- current CLI spec and tests already live here
-- rollout is initially only for `langgraph-cli`
-- command compatibility should be driven by existing behavior in this repo
-
-## Architecture
-
-Use process boundaries, not language FFI.
-
-Python should not call a Go shared library directly. Instead:
-
-- Python launcher locates bundled `langgraph` Go binary
-- Python launcher `exec`s or subprocesses into the Go binary
-- Go handles all command execution
-- for `dev`, Go subprocesses back into Python
-
-This keeps the boundary simple and cross-platform.
-
-## Go Package Structure
-
-Recommended structure:
-
-- `pkg/cli/config`
-  - parse and validate `langgraph.json`
-  - normalize config model
-- `pkg/cli/docker`
-  - docker capability detection
-  - compose generation
-  - Dockerfile/build plan generation
-- `pkg/cli/deploy`
-  - deployment flows
-  - host backend client
-  - polling, logs, revision logic
-- `pkg/cli/dev`
-  - `dev` command orchestration
-  - Python subprocess handoff
-- `pkg/cli/cmds`
-  - command runner functions with typed options/results
-  - no Cobra-specific code here
-- `cmd/langgraph`
-  - standalone Go binary wrapping shared packages
-
-Business logic should live in shared packages, not directly in CLI adapter code.
-
-## Python Wrapper Model
-
-The Python package remains installed as `langgraph-cli`, with entrypoint
-`langgraph`.
-
-During migration, the wrapper decides whether to route to legacy Python or Go.
-
-Wrapper behavior:
-
-1. inspect feature flags
-2. resolve Go binary path
-3. if Go path is active, `exec` into Go binary
-4. otherwise fall back to legacy Python implementation
-
-Long-term target:
-
-- remove fallback
-- Python wrapper always launches bundled Go binary
-
-## Feature Flags
-
-Temporary rollout env vars:
-
-- `LANGGRAPH_USE_GO_CLI=1`
-  - route the Python wrapper to the Go binary instead of legacy Python
-- `LANGGRAPH_GO_CLI_PATH=/path/to/langgraph`
-  - internal/dev/CI override for binary path resolution
-  - not intended as a long-term public interface
-- `LANGGRAPH_CALLING_PYTHON=/path/to/python`
-  - set by the Python wrapper before invoking Go
-  - used by Go for `dev`
-
-`LANGGRAPH_GO_CLI_PATH` is mainly for local development and CI and can be
-removed later.
-
-## `dev` Invocation Contract
-
-`dev` is the main tricky area.
-
-Design rule:
-
-- Go owns CLI parsing and routing
-- Python owns the actual in-process local dev server runtime
-
-Flow for `uv run langgraph dev`:
-
-1. `uv` selects the Python interpreter/environment
-2. Python wrapper starts
-3. Python wrapper sets `LANGGRAPH_CALLING_PYTHON=sys.executable`
-4. Python wrapper launches Go binary
-5. Go receives `dev`
-6. Go shells out to that exact Python interpreter for the actual Python runtime behavior
-
-This preserves the current selected Python environment.
-
-Go Python resolution order for `dev`:
-
-1. `LANGGRAPH_CALLING_PYTHON`
-2. optional explicit override if added later
-3. environment-derived interpreter / active venv
-4. fallback detection
-5. clear failure
-
-The critical constraint is: if the user entered through Python, `dev` should
-use that exact Python when possible.
-
-## Why Not FFI
-
-Do not use:
-
-- cgo shared libs
-- Python-Go FFI bindings
-- embedded Python in Go
-- RPC unless absolutely necessary
-
-Reasons:
-
-- packaging complexity
-- cross-platform pain
-- no advantage for a CLI architecture
-- much worse release/debug story
-
-Process-level boundaries are the right choice here.
-
-## Packaging Constraints
-
-The Go binary should be bundled inside Python wheels.
-
-Preferred distribution model:
-
-- build platform-specific `langgraph-cli` wheels
-- each wheel includes the matching `langgraph` Go binary
-- Python launcher resolves and executes the bundled binary
-
-Do not rely on runtime download of the binary for normal operation.
-
-Support matrix target:
-
-- all OS/arch targets that are currently expected to be supported
-- at minimum, align with the practical support matrix desired for the CLI,
-  using `orjson` support as a rough proxy if needed
-
-If a platform is unsupported, fail clearly rather than silently falling back
-forever.
-
-## Release Constraints
-
-Phase 1 versioning applies to:
-
-- shared Go implementation
-- standalone Go `langgraph` binary
-- PyPI `langgraph-cli` wrapper
-
-They should stay on one version line.
-
-Constraint:
-
-- bundled Go binary version must exactly match the Python wrapper version for
-  the migrated surface
-
-The wrapper should detect obvious mismatch and fail clearly if it occurs.
-
-## Migration Strategy
-
-Use a big-bang hidden implementation change with gradual activation.
-
-Phase 1 rollout:
-
-1. implement full Go path behind `LANGGRAPH_USE_GO_CLI`
-2. keep default behavior on legacy Python
-3. run dual CI for legacy and Go-backed paths
-4. dogfood with feature flag
-5. flip default to Go
-6. keep fallback briefly
-7. remove fallback in about two weeks
-
-This is a big internal rewrite with gradual external activation.
-
-## CI Strategy
-
-Dual CI is required during migration.
-
-Run both variants:
-
-- legacy Python implementation
-- Python wrapper -> Go binary implementation
-
-Required parity checks:
-
-- help output
-- exit code
-- stdout
-- stderr
-- generated Dockerfile output
-- generated compose output
-- mocked deployment API request semantics
-- validation errors / usage errors
-
-Goal is not merely "both tests pass". Goal is "both implementations behave
-identically enough to swap by default safely".
-
-## Parity Test Philosophy
-
-Use the current Python CLI tests as the behavioral spec.
-
-Priority test areas:
-
-- config validation
-- compose/Dockerfile generation
-- deployment flows
-- error and prompt behavior
-- command help / command surface
-
-Where practical, add golden comparisons so regressions are obvious.
-
-## Implementation Order Inside Phase 1
-
-Even though rollout is one hidden phase, implementation should proceed in this
-order:
-
-1. wrapper contract and env contract
-2. Go command scaffolding and package boundaries
-3. config + docker/build/compose logic
-4. deploy flows
-5. remaining commands
-6. `dev` subprocess orchestration
-7. parity hardening in CI
-
-This reduces risk because `dev` is the highest-uncertainty area.
-
-## Command Ownership Constraint
-
-All command behavior should live in Go once ported.
-
-Do not allow:
-
-- some flags parsed in Python and others in Go
-- duplicated command logic across Python and Go
-- separate behavior definitions for legacy and migrated commands
-
-The wrapper should be thin only.
-
-## Fallback Constraint
-
-Fallback is temporary, not a product feature.
-
-Policy:
-
-- use feature flag during migration
-- flip default after parity confidence
-- remove legacy Python implementation roughly two weeks later
-
-Do not normalize to permanent dual execution paths.
-
-## Documentation Constraint
-
-During migration, documentation should stay conservative:
-
-- existing Python install flow remains primary
-- feature flag is acceptable for internal/dogfood docs
-- avoid broad external messaging about the Go implementation until default is flipped
-
-## Open Issues To Track
-
-These are not blockers, but they need explicit implementation decisions:
-
-- exact bundled wheel layout for binaries
-- exact list of supported OS/arch targets
-- whether to expose a public `--python` override for `dev`
-- whether some pretty output is allowed to improve while keeping parsed output stable
-
-## Summary
-
-Phase 1 plan:
-
-- move the entire `langgraph` CLI implementation into shared Go code in the
-  `langgraph` repo
-- ship a standalone `langgraph` Go binary
-- keep `langgraph-cli` on PyPI as a thin launcher that bundles and executes
-  that binary
-- preserve `uv run` / `uvx` behavior
-- handle `dev` by passing the calling Python path through the wrapper and
-  having Go subprocess back into Python
-- gate everything behind `LANGGRAPH_USE_GO_CLI`
-- run dual CI until parity is proven
-- flip default
-- remove legacy fallback quickly

libs/cli/Makefile

@@ -1,21 +1,15 @@
 .PHONY: test lint type format test-integration update-schema bump-version
-.PHONY: test-go lint-go format-go
-.PHONY: build-go build-go-all clean-go-bin
 
 ######################
 # TESTING AND COVERAGE
 ######################
 
 TEST?= "tests/unit_tests"
-GO_FILES=$(shell find cmd internal -type f -name '*.go' 2>/dev/null)
-test: test-go
+test:
 	uv run pytest $(TEST)
 test-integration:
 	uv run pytest tests/integration_tests
 
-test-go:
-	[ ! -f go.mod ] || go test ./...
-
 ######################
 # LINTING AND FORMATTING
 ######################
@@ -29,94 +23,19 @@ lint_package: PYTHON_FILES=langgraph_cli
 lint_tests: PYTHON_FILES=tests
 lint_tests: MYPY_CACHE=.mypy_cache_test
 
-lint lint_diff lint_package lint_tests: lint-go
+lint lint_diff lint_package lint_tests:
 	uv run ruff check .
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
 	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
-lint-go:
-	[ -z "$(GO_FILES)" ] || test -z "$$(gofmt -l $(GO_FILES))"
-
 type:
 	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
 
-format format_diff: format-go
+format format_diff:
 	uv run ruff format $(PYTHON_FILES)
 	uv run ruff check --select I --fix $(PYTHON_FILES)
 
-format-go:
-	[ -z "$(GO_FILES)" ] || gofmt -w $(GO_FILES)
-
-######################
-# GO BINARY CROSS-COMPILATION
-######################
-
-GO_MODULE=github.com/langchain-ai/langgraph/libs/cli
-GO_BINARY=cmd/langgraph/main.go
-GO_VERSION_PKG=$(GO_MODULE)/internal/version
-GO_BIN_DIR=langgraph_cli/bin
-GO_VERSION=$(shell grep -m 1 '^__version__' langgraph_cli/__init__.py | cut -d '"' -f 2)
-GO_COMMIT=$(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
-GO_DATE=$(shell date -u +%Y-%m-%dT%H:%M:%SZ)
-GO_LDFLAGS=-s -w \
-  -X '$(GO_VERSION_PKG).Version=$(GO_VERSION)' \
-  -X '$(GO_VERSION_PKG).Commit=$(GO_COMMIT)' \
-  -X '$(GO_VERSION_PKG).Date=$(GO_DATE)'
-
-# Platform matrix — covers every platform orjson ships for. Since the Go
-# binary is statically linked (CGO_ENABLED=0), the same linux binary works
-# on both glibc and musl. Musllinux wheels reuse the linux binary but are
-# tagged differently so pip installs them on Alpine/musl systems.
-GO_PLATFORMS = \
-  linux/amd64 \
-  linux/arm64 \
-  linux/arm \
-  linux/386 \
-  linux/ppc64le \
-  linux/s390x \
-  darwin/amd64 \
-  darwin/arm64 \
-  windows/amd64 \
-  windows/arm64 \
-  windows/386
-
-# Build for the current platform (development).
-build-go:
-	@mkdir -p $(GO_BIN_DIR)
-	go build -ldflags "$(GO_LDFLAGS)" -o $(GO_BIN_DIR)/langgraph $(GO_BINARY)
-	@echo "Built $(GO_BIN_DIR)/langgraph"
-
-# Build for a single target: make build-go-target GOOS=linux GOARCH=amd64
-build-go-target:
-	$(eval EXT=$(if $(filter windows,$(GOOS)),.exe,))
-	@mkdir -p $(GO_BIN_DIR)
-	GOOS=$(GOOS) GOARCH=$(GOARCH) CGO_ENABLED=0 \
-		go build -ldflags "$(GO_LDFLAGS)" \
-		-o $(GO_BIN_DIR)/langgraph-$(GOOS)-$(GOARCH)$(EXT) $(GO_BINARY)
-	@echo "Built $(GO_BIN_DIR)/langgraph-$(GOOS)-$(GOARCH)$(EXT)"
-
-# Build for all platforms.
-build-go-all:
-	@mkdir -p $(GO_BIN_DIR)
-	@for platform in $(GO_PLATFORMS); do \
-		os=$${platform%/*}; arch=$${platform#*/}; \
-		ext=""; \
-		if [ "$$os" = "windows" ]; then ext=".exe"; fi; \
-		echo "Building $$os/$$arch..."; \
-		GOOS=$$os GOARCH=$$arch CGO_ENABLED=0 \
-			go build -ldflags "$(GO_LDFLAGS)" \
-			-o $(GO_BIN_DIR)/langgraph-$$os-$$arch$$ext $(GO_BINARY) || exit 1; \
-	done
-	@echo "All platforms built in $(GO_BIN_DIR)/"
-
-clean-go-bin:
-	rm -rf $(GO_BIN_DIR)
-
-######################
-# SCHEMA AND VERSIONING
-######################
-
 update-schema:
 	uv run python generate_schema.py
 

libs/cli/cmd/langgraph/main.go

@@ -1,11 +0,0 @@
-package main
-
-import (
-	"os"
-
-	"github.com/langchain-ai/langgraph/libs/cli/internal/root"
-)
-
-func main() {
-	os.Exit(root.Run(os.Args[1:], os.Stdout, os.Stderr))
-}

libs/cli/examples/graph_prerelease_reqs/deps/zuper_deps/pyproject.toml

@@ -5,5 +5,5 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.1"
+  "langchain-openai==1.1.14"
 ]

libs/cli/examples/graph_prerelease_reqs/pyproject.toml

@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.0a2",
+  "langchain-openai==1.1.14",
   "langchain-anthropic==1.0.0a5",
   "langgraph==1.1.5"
 ]

libs/cli/examples/graph_prerelease_reqs_fail/pyproject.toml

@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.0a2",
+  "langchain-openai==1.1.14",
   "langgraph==1.1.2",
   "langchain_community>=0.3.0",
 ]

libs/cli/go.mod

@@ -1,3 +0,0 @@
-module github.com/langchain-ai/langgraph/libs/cli
-
-go 1.23.0

libs/cli/hatch_build.py

@@ -1,59 +0,0 @@
-"""Hatch build hook that bundles the platform-specific Go binary into the wheel.
-
-Usage:
-  1. Cross-compile: make build-go-target GOOS=linux GOARCH=amd64
-  2. Set LANGGRAPH_GO_BINARY to the built binary path
-  3. Build wheel: uv build --wheel
-
-The hook copies the binary into langgraph_cli/bin/ so the entrypoint can find it.
-If LANGGRAPH_GO_BINARY is not set, the wheel is built without a binary (pure Python
-fallback — fine for development and the legacy code path).
-"""
-
-from __future__ import annotations
-
-import os
-import shutil
-import stat
-from pathlib import Path
-
-from hatchling.builders.hooks.plugin.interface import BuildHookInterface
-
-
-class GoBinaryBuildHook(BuildHookInterface):
-    PLUGIN_NAME = "go-binary"
-
-    def initialize(self, version: str, build_data: dict) -> None:
-        bin_dir = Path("langgraph_cli/bin")
-        if bin_dir.exists():
-            shutil.rmtree(bin_dir)
-
-        binary_path = os.environ.get("LANGGRAPH_GO_BINARY")
-        if not binary_path:
-            return
-
-        source = Path(binary_path)
-        if not source.is_file():
-            msg = f"LANGGRAPH_GO_BINARY points to missing file: {source}"
-            raise FileNotFoundError(msg)
-
-        bin_dir.mkdir(parents=True, exist_ok=True)
-
-        # Determine output name (langgraph or langgraph.exe)
-        dest_name = "langgraph.exe" if source.suffix == ".exe" else "langgraph"
-        dest = bin_dir / dest_name
-
-        shutil.copy2(str(source), str(dest))
-        # Ensure executable permission
-        dest.chmod(dest.stat().st_mode | stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH)
-
-        # Tell hatch to include the binary in the wheel
-        build_data["shared_data"] = {}
-        build_data["force_include"] = {
-            str(dest): f"langgraph_cli/bin/{dest_name}",
-        }
-
-        # Set the platform tag so pip installs the right wheel
-        platform_tag = os.environ.get("LANGGRAPH_WHEEL_PLAT")
-        if platform_tag:
-            build_data["tag"] = f"py3-none-{platform_tag}"

libs/cli/internal/config/config.go

@@ -1,698 +0,0 @@
-// Package config provides validation for langgraph.json configuration files.
-package config
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strconv"
-	"strings"
-)
-
-const (
-	MinNodeVersion       = "20"
-	DefaultNodeVersion   = "20"
-	MinPythonVersion     = "3.11"
-	DefaultPythonVersion = "3.11"
-	DefaultImageDistro   = "debian"
-)
-
-var validDistros = []string{"debian", "wolfi", "bookworm"}
-
-var knownConfigKeys = map[string]bool{
-	"python_version":       true,
-	"node_version":         true,
-	"api_version":          true,
-	"base_image":           true,
-	"image_distro":         true,
-	"pip_config_file":      true,
-	"pip_installer":        true,
-	"source":               true,
-	"dependencies":         true,
-	"dockerfile_lines":     true,
-	"graphs":               true,
-	"env":                  true,
-	"store":                true,
-	"auth":                 true,
-	"encryption":           true,
-	"http":                 true,
-	"webhooks":             true,
-	"checkpointer":         true,
-	"ui":                   true,
-	"ui_config":            true,
-	"keep_pkg_tools":       true,
-	"_INTERNAL_docker_tag": true,
-	"project_root":         true,
-	"package":              true,
-}
-
-var nodeExtensions = map[string]bool{
-	".ts": true, ".mts": true, ".cts": true,
-	".js": true, ".mjs": true, ".cjs": true,
-}
-
-// isNodeGraph checks whether a graph spec refers to a Node.js file.
-func isNodeGraph(spec any) bool {
-	var filePath string
-	switch v := spec.(type) {
-	case string:
-		filePath = strings.SplitN(v, ":", 2)[0]
-	case map[string]any:
-		if p, _ := v["path"].(string); p != "" {
-			filePath = strings.SplitN(p, ":", 2)[0]
-		}
-	}
-	return nodeExtensions[filepath.Ext(filePath)]
-}
-
-// getSourceKind extracts source.kind from a raw config.
-func getSourceKind(raw map[string]any) string {
-	source, ok := raw["source"]
-	if !ok {
-		return ""
-	}
-	m, ok := source.(map[string]any)
-	if !ok {
-		return ""
-	}
-	kind, _ := m["kind"].(string)
-	return kind
-}
-
-// getString returns the string value for key, or "" if missing/wrong type.
-func getString(raw map[string]any, key string) string {
-	v, _ := raw[key].(string)
-	return v
-}
-
-// parseVersion parses "3.11" or "0.8.1" into integer parts.
-func parseVersion(s string) ([]int, error) {
-	s = strings.SplitN(s, "-", 2)[0]
-	parts := strings.Split(s, ".")
-	result := make([]int, len(parts))
-	for i, p := range parts {
-		n, err := strconv.Atoi(p)
-		if err != nil {
-			return nil, fmt.Errorf("invalid version part: %s", p)
-		}
-		result[i] = n
-	}
-	return result, nil
-}
-
-// versionLessThan returns true if a < b (component-wise).
-func versionLessThan(a, b []int) bool {
-	for i := 0; i < len(a) && i < len(b); i++ {
-		if a[i] < b[i] {
-			return true
-		}
-		if a[i] > b[i] {
-			return false
-		}
-	}
-	return len(a) < len(b)
-}
-
-// ValidateConfig validates a raw config map and returns a normalised copy.
-// Errors match the Python CLI's click.UsageError messages exactly.
-func ValidateConfig(raw map[string]any) (map[string]any, error) {
-	// --- detect graph types ---
-	graphs, _ := raw["graphs"].(map[string]any)
-	hasNode, hasPython := false, false
-	for _, spec := range graphs {
-		if isNodeGraph(spec) {
-			hasNode = true
-		} else {
-			hasPython = true
-		}
-	}
-
-	// --- version defaults ---
-	nodeVersion := getString(raw, "node_version")
-	pythonVersion := getString(raw, "python_version")
-
-	if hasNode && nodeVersion == "" {
-		nodeVersion = DefaultNodeVersion
-	}
-	if hasPython && pythonVersion == "" {
-		pythonVersion = DefaultPythonVersion
-	}
-
-	imageDistro := getString(raw, "image_distro")
-	if imageDistro == "" {
-		imageDistro = DefaultImageDistro
-	}
-
-	// --- mutual exclusion: _INTERNAL_docker_tag vs api_version ---
-	_, hasInternalTag := raw["_INTERNAL_docker_tag"]
-	_, hasAPIVersion := raw["api_version"]
-	if hasInternalTag && hasAPIVersion {
-		return nil, fmt.Errorf("Cannot specify both _INTERNAL_docker_tag and api_version.")
-	}
-
-	// --- api_version format ---
-	if apiVersion := getString(raw, "api_version"); apiVersion != "" {
-		base := strings.SplitN(apiVersion, "-", 2)[0]
-		parts := strings.Split(base, ".")
-		if len(parts) > 3 {
-			return nil, fmt.Errorf("Version must be major or major.minor or major.minor.patch.")
-		}
-		for _, p := range parts {
-			if _, err := strconv.Atoi(p); err != nil {
-				return nil, fmt.Errorf(
-					"Invalid version format: %s.\n\n"+
-						"Pin to a minor version, e.g.:\n"+
-						"  \"api_version\": \"0.8\"", apiVersion)
-			}
-		}
-	}
-
-	// --- build result config with defaults ---
-	config := map[string]any{
-		"node_version":     nodeVersion,
-		"python_version":   pythonVersion,
-		"pip_config_file":  raw["pip_config_file"],
-		"pip_installer":    "auto",
-		"source":           raw["source"],
-		"base_image":       raw["base_image"],
-		"image_distro":     imageDistro,
-		"dependencies":     raw["dependencies"],
-		"dockerfile_lines": raw["dockerfile_lines"],
-		"graphs":           raw["graphs"],
-		"env":              raw["env"],
-		"store":            raw["store"],
-		"auth":             raw["auth"],
-		"encryption":       raw["encryption"],
-		"http":             raw["http"],
-		"webhooks":         raw["webhooks"],
-		"checkpointer":     raw["checkpointer"],
-		"ui":               raw["ui"],
-		"ui_config":        raw["ui_config"],
-		"keep_pkg_tools":   raw["keep_pkg_tools"],
-	}
-	if raw["pip_installer"] != nil {
-		config["pip_installer"] = raw["pip_installer"]
-	}
-	if hasInternalTag {
-		config["_INTERNAL_docker_tag"] = raw["_INTERNAL_docker_tag"]
-	}
-	if hasAPIVersion {
-		config["api_version"] = raw["api_version"]
-	}
-
-	// Apply list defaults.
-	if config["dependencies"] == nil {
-		config["dependencies"] = []any{}
-	}
-	if config["dockerfile_lines"] == nil {
-		config["dockerfile_lines"] = []any{}
-	}
-	if config["graphs"] == nil {
-		config["graphs"] = map[string]any{}
-	}
-	if config["env"] == nil {
-		config["env"] = map[string]any{}
-	}
-
-	// --- node_version validation ---
-	if nodeVersion != "" {
-		if strings.Contains(nodeVersion, ".") {
-			return nil, fmt.Errorf("Node.js version must be major version only")
-		}
-		major, err := strconv.Atoi(nodeVersion)
-		if err != nil {
-			return nil, fmt.Errorf(
-				"Invalid Node.js version format: %s. Use major version only (e.g., '20').",
-				nodeVersion)
-		}
-		minMajor, _ := strconv.Atoi(MinNodeVersion)
-		if major < minMajor {
-			return nil, fmt.Errorf(
-				"Node.js version %s is not supported. "+
-					"Minimum required version is %s.\n\n"+
-					"Set node_version to %s or higher:\n"+
-					"  \"node_version\": \"%s\"",
-				nodeVersion, MinNodeVersion, MinNodeVersion, MinNodeVersion)
-		}
-	}
-
-	// --- pip_installer validation ---
-	if pi, ok := raw["pip_installer"].(string); ok {
-		switch pi {
-		case "auto", "pip", "uv":
-			// valid
-		default:
-			return nil, fmt.Errorf(
-				"Invalid pip_installer: '%s'. "+
-					"Consider using uv-based source management instead:\n\n"+
-					"  \"source\": {\"kind\": \"uv\", \"root\": \"..\"}",
-				pi)
-		}
-	}
-
-	// --- source validation ---
-	sourceKind := getSourceKind(raw)
-	if source := raw["source"]; source != nil {
-		if _, ok := source.(map[string]any); !ok {
-			return nil, fmt.Errorf(
-				"`source` must be an object, e.g.:\n" +
-					"  \"source\": {\"kind\": \"uv\", \"root\": \"..\"}")
-		}
-		if sourceKind != "uv" {
-			return nil, fmt.Errorf(
-				"Invalid source.kind. The only supported value is 'uv':\n" +
-					"  \"source\": {\"kind\": \"uv\", \"root\": \"..\"}")
-		}
-	}
-
-	// --- python_version validation ---
-	if pythonVersion != "" {
-		base := strings.SplitN(pythonVersion, "-", 2)[0]
-		dotParts := strings.Split(base, ".")
-		allDigits := true
-		for _, p := range dotParts {
-			if _, err := strconv.Atoi(p); err != nil {
-				allDigits = false
-				break
-			}
-		}
-		if len(dotParts) != 2 || !allDigits {
-			fix := MinPythonVersion
-			if len(dotParts) >= 2 {
-				fix = dotParts[0] + "." + dotParts[1]
-			}
-			return nil, fmt.Errorf(
-				"Invalid Python version format: %s. "+
-					"Use 'major.minor' format — patch version cannot be specified.\n\n"+
-					"  \"python_version\": \"%s\"",
-				pythonVersion, fix)
-		}
-		pyParsed, _ := parseVersion(pythonVersion)
-		minParsed, _ := parseVersion(MinPythonVersion)
-		if versionLessThan(pyParsed, minParsed) {
-			return nil, fmt.Errorf(
-				"Python version %s is not supported. "+
-					"Minimum required version is %s.\n\n"+
-					"  \"python_version\": \"%s\"",
-				pythonVersion, MinPythonVersion, MinPythonVersion)
-		}
-		if strings.Contains(pythonVersion, "bullseye") {
-			return nil, fmt.Errorf(
-				"Bullseye images were deprecated in version 0.4.13. " +
-					"Please use 'bookworm' or 'debian' instead.")
-		}
-
-		// dependencies required when not uv
-		deps, _ := config["dependencies"].([]any)
-		if sourceKind != "uv" && len(deps) == 0 {
-			return nil, fmt.Errorf(
-				"No dependencies found in config. " +
-					"Consider using uv-based source management:\n\n" +
-					"  \"source\": {\"kind\": \"uv\", \"root\": \"..\"}")
-		}
-	}
-
-	// --- graphs required ---
-	graphMap, _ := config["graphs"].(map[string]any)
-	if len(graphMap) == 0 {
-		return nil, fmt.Errorf(
-			"No graphs found in config. Add at least one graph, e.g.:\n" +
-				"  \"graphs\": {\n" +
-				"    \"agent\": \"./my_agent/graph.py:graph\"\n" +
-				"  }")
-	}
-
-	// --- image_distro validation ---
-	if imageDistro == "bullseye" {
-		return nil, fmt.Errorf(
-			"Bullseye images were deprecated in version 0.4.13. " +
-				"Please use 'bookworm' or 'debian' instead.")
-	}
-	validDistro := false
-	for _, d := range validDistros {
-		if imageDistro == d {
-			validDistro = true
-			break
-		}
-	}
-	if !validDistro {
-		quoted := make([]string, len(validDistros))
-		for i, d := range validDistros {
-			quoted[i] = fmt.Sprintf("'%s'", d)
-		}
-		return nil, fmt.Errorf(
-			"Invalid image_distro: '%s'. "+
-				"Must be one of: %s.\n\n"+
-				"  \"image_distro\": \"wolfi\"  (recommended)",
-			imageDistro, strings.Join(quoted, ", "))
-	}
-
-	// --- uv source mode validation ---
-	if sourceKind == "uv" {
-		var errs []string
-		if pythonVersion == "" {
-			errs = append(errs, "source.kind 'uv' requires `python_version` — it is a Python-only deployment mode. Node.js-only graphs are not supported.")
-		}
-
-		deps, _ := raw["dependencies"].([]any)
-		if deps != nil && len(deps) > 0 {
-			errs = append(errs, "Remove `dependencies` from your config. With `source.kind = \"uv\"`, all dependencies are read from your pyproject.toml and uv.lock instead.")
-		}
-		// Also check if dependencies key exists even if empty array.
-		if deps == nil {
-			if rawDeps, exists := raw["dependencies"]; exists && rawDeps != nil {
-				// dependencies key present but not an array — still flag it
-				if depsArr, ok := rawDeps.([]any); ok && len(depsArr) > 0 {
-					errs = append(errs, "Remove `dependencies` from your config. With `source.kind = \"uv\"`, all dependencies are read from your pyproject.toml and uv.lock instead.")
-				}
-			}
-		}
-
-		sourceMap, _ := raw["source"].(map[string]any)
-		if root, exists := sourceMap["root"]; exists {
-			rootStr, ok := root.(string)
-			if !ok {
-				errs = append(errs, fmt.Sprintf("`source.root` must be a string, got %T.", root))
-			} else if rootStr == "" {
-				errs = append(errs, "`source.root` must be a non-empty string. Use `\".\"`.")
-			}
-		}
-
-		if pkg, exists := sourceMap["package"]; exists {
-			if pkg != nil {
-				pkgStr, ok := pkg.(string)
-				if !ok {
-					errs = append(errs, "`source.package` must be a non-empty string.")
-				} else if pkgStr == "" {
-					errs = append(errs, "`source.package` must be a non-empty string.")
-				}
-			}
-		}
-
-		if len(errs) > 0 {
-			formatted := ""
-			for i, e := range errs {
-				formatted += fmt.Sprintf("\n  %d. %s", i+1, e)
-			}
-			return nil, fmt.Errorf(
-				"source.kind 'uv' requires a different config shape than dependency-based installs:%s",
-				formatted)
-		}
-	}
-
-	// --- legacy project_root / package ---
-	_, hasProjectRoot := raw["project_root"]
-	_, hasPackage := raw["package"]
-	if hasProjectRoot || hasPackage {
-		return nil, fmt.Errorf(
-			"Top-level `project_root` and `package` are no longer supported. " +
-				"Use `source.root` and `source.package` instead.")
-	}
-
-	// --- auth path validation ---
-	if auth, ok := raw["auth"].(map[string]any); ok {
-		if authPath, _ := auth["path"].(string); authPath != "" {
-			if !strings.Contains(authPath, ":") {
-				return nil, fmt.Errorf(
-					"Invalid auth.path format: '%s'. "+
-						"Must be in format './path/to/file.py:attribute_name'",
-					authPath)
-			}
-		}
-	}
-
-	// --- encryption path validation ---
-	if enc, ok := raw["encryption"].(map[string]any); ok {
-		if encPath, _ := enc["path"].(string); encPath != "" {
-			if !strings.Contains(encPath, ":") {
-				return nil, fmt.Errorf(
-					"Invalid encryption.path format: '%s'. "+
-						"Must be in format './path/to/file.py:attribute_name'",
-					encPath)
-			}
-		}
-	}
-
-	// --- http.app path validation ---
-	if httpConf, ok := raw["http"].(map[string]any); ok {
-		if app, _ := httpConf["app"].(string); app != "" {
-			if !strings.Contains(app, ":") {
-				return nil, fmt.Errorf(
-					"Invalid http.app format: '%s'. "+
-						"Must be in format './path/to/file.py:attribute_name'",
-					app)
-			}
-		}
-	}
-
-	// --- keep_pkg_tools validation ---
-	if kpt := raw["keep_pkg_tools"]; kpt != nil {
-		validBuildTools := map[string]bool{"pip": true, "setuptools": true, "wheel": true}
-		switch v := kpt.(type) {
-		case bool:
-			// ok
-		case []any:
-			for _, item := range v {
-				tool, ok := item.(string)
-				if !ok || !validBuildTools[tool] {
-					return nil, fmt.Errorf(
-						"Invalid keep_pkg_tools: '%v'. "+
-							"Must be one of 'pip', 'setuptools', 'wheel'.",
-						item)
-				}
-			}
-		default:
-			return nil, fmt.Errorf(
-				"Invalid keep_pkg_tools: '%v'. "+
-					"Must be bool or list[str] (with values 'pip', 'setuptools', and/or 'wheel').",
-				kpt)
-		}
-	}
-
-	return config, nil
-}
-
-// ValidateConfigFile loads a config file, validates it, and returns the result.
-func ValidateConfigFile(configPath string) (map[string]any, error) {
-	raw, err := LoadRawConfigFile(configPath)
-	if err != nil {
-		return nil, err
-	}
-
-	return validateConfigFile(configPath, raw)
-}
-
-// LoadRawConfigFile loads a config file and requires the top-level JSON value
-// to be an object.
-func LoadRawConfigFile(configPath string) (map[string]any, error) {
-	data, err := os.ReadFile(configPath)
-	if err != nil {
-		return nil, fmt.Errorf("could not read config file: %w", err)
-	}
-
-	var rawAny any
-	if err := json.Unmarshal(data, &rawAny); err != nil {
-		return nil, fmt.Errorf("Invalid JSON in %s: %s", configPath, err.Error())
-	}
-
-	raw, ok := rawAny.(map[string]any)
-	if !ok {
-		return nil, fmt.Errorf(
-			"Invalid config in %s: top-level JSON value must be an object.",
-			configPath,
-		)
-	}
-
-	return raw, nil
-}
-
-func validateConfigFile(configPath string, raw map[string]any) (map[string]any, error) {
-	validated, err := ValidateConfig(raw)
-	if err != nil {
-		return nil, err
-	}
-
-	// Check package.json node version if node_version is set.
-	if nv, _ := validated["node_version"].(string); nv != "" {
-		dir := filepath.Dir(configPath)
-		pkgJSONPath := filepath.Join(dir, "package.json")
-		if info, statErr := os.Stat(pkgJSONPath); statErr == nil && !info.IsDir() {
-			if pkgErr := validatePackageJSON(pkgJSONPath); pkgErr != nil {
-				return nil, pkgErr
-			}
-		}
-	}
-
-	return validated, nil
-}
-
-func validatePackageJSON(path string) error {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		return nil
-	}
-
-	var pkg map[string]any
-	if err := json.Unmarshal(data, &pkg); err != nil {
-		return fmt.Errorf(
-			"Invalid package.json found in langgraph config directory %s: file is not valid JSON",
-			path,
-		)
-	}
-
-	enginesRaw, ok := pkg["engines"]
-	if !ok {
-		return nil
-	}
-	engines, ok := enginesRaw.(map[string]any)
-	if !ok {
-		return nil
-	}
-
-	for k := range engines {
-		if k != "node" {
-			keys := make([]string, 0, len(engines))
-			for ek := range engines {
-				keys = append(keys, ek)
-			}
-			return fmt.Errorf(
-				"Only 'node' engine is supported in package.json engines. Got engines: %v",
-				keys)
-		}
-	}
-
-	if nodeVer, ok := engines["node"].(string); ok && nodeVer != "" {
-		if strings.Contains(nodeVer, ".") {
-			return fmt.Errorf(
-				"Node.js version in package.json engines must be >= %s "+
-					"(major version only), got '%s'. "+
-					"Minor/patch versions (like '20.x.y') are not supported to "+
-					"prevent deployment issues when new Node.js versions are released.",
-				MinNodeVersion, nodeVer)
-		}
-		major, err := strconv.Atoi(nodeVer)
-		if err == nil {
-			minMajor, _ := strconv.Atoi(MinNodeVersion)
-			if major < minMajor {
-				return fmt.Errorf(
-					"Node.js version in package.json engines must be >= %s "+
-						"(major version only), got '%s'. "+
-						"Minor/patch versions (like '20.x.y') are not supported to "+
-						"prevent deployment issues when new Node.js versions are released.",
-					MinNodeVersion, nodeVer)
-			}
-		}
-	}
-
-	return nil
-}
-
-// GetUnknownKeys returns warnings for unrecognised top-level keys.
-func GetUnknownKeys(raw map[string]any) []string {
-	var unknown []string
-	for k := range raw {
-		if !knownConfigKeys[k] {
-			unknown = append(unknown, k)
-		}
-	}
-	sortStrings(unknown)
-
-	var warnings []string
-	knownList := make([]string, 0, len(knownConfigKeys))
-	for k := range knownConfigKeys {
-		knownList = append(knownList, k)
-	}
-
-	for _, key := range unknown {
-		if close := closestMatch(key, knownList); close != "" {
-			warnings = append(warnings, fmt.Sprintf("Unknown key '%s' — did you mean '%s'?", key, close))
-		} else {
-			warnings = append(warnings, fmt.Sprintf("Unknown key '%s' is not a recognized config field.", key))
-		}
-	}
-	return warnings
-}
-
-// closestMatch finds the best match for word among candidates using edit distance.
-// Returns "" if no match is close enough (ratio >= 0.6).
-func closestMatch(word string, candidates []string) string {
-	best := ""
-	bestRatio := 0.6 // minimum threshold
-	for _, c := range candidates {
-		ratio := similarity(word, c)
-		if ratio > bestRatio {
-			bestRatio = ratio
-			best = c
-		}
-	}
-	return best
-}
-
-// similarity returns a ratio in [0,1] based on Levenshtein distance.
-func similarity(a, b string) float64 {
-	maxLen := len(a)
-	if len(b) > maxLen {
-		maxLen = len(b)
-	}
-	if maxLen == 0 {
-		return 1.0
-	}
-	dist := editDistance(a, b)
-	return 1.0 - float64(dist)/float64(maxLen)
-}
-
-// editDistance computes Levenshtein distance between two strings.
-func editDistance(a, b string) int {
-	la, lb := len(a), len(b)
-	if la == 0 {
-		return lb
-	}
-	if lb == 0 {
-		return la
-	}
-
-	prev := make([]int, lb+1)
-	curr := make([]int, lb+1)
-
-	for j := 0; j <= lb; j++ {
-		prev[j] = j
-	}
-	for i := 1; i <= la; i++ {
-		curr[0] = i
-		for j := 1; j <= lb; j++ {
-			cost := 1
-			if a[i-1] == b[j-1] {
-				cost = 0
-			}
-			ins := curr[j-1] + 1
-			del := prev[j] + 1
-			sub := prev[j-1] + cost
-			curr[j] = min3(ins, del, sub)
-		}
-		prev, curr = curr, prev
-	}
-	return prev[lb]
-}
-
-func min3(a, b, c int) int {
-	if a < b {
-		if a < c {
-			return a
-		}
-		return c
-	}
-	if b < c {
-		return b
-	}
-	return c
-}
-
-// sortStrings sorts a slice of strings in place (simple insertion sort, fine for small n).
-func sortStrings(s []string) {
-	for i := 1; i < len(s); i++ {
-		for j := i; j > 0 && s[j] < s[j-1]; j-- {
-			s[j], s[j-1] = s[j-1], s[j]
-		}
-	}
-}

libs/cli/internal/config/config_test.go

@@ -1,568 +0,0 @@
-package config
-
-import (
-	"strings"
-	"testing"
-)
-
-// baseConfig returns a minimal valid config map. Tests should copy and modify it.
-func baseConfig() map[string]any {
-	return map[string]any{
-		"dependencies": []any{"langchain"},
-		"graphs":       map[string]any{"agent": "./agent.py:graph"},
-	}
-}
-
-// copyMap returns a shallow copy of m.
-func copyMap(m map[string]any) map[string]any {
-	out := make(map[string]any, len(m))
-	for k, v := range m {
-		out[k] = v
-	}
-	return out
-}
-
-// mustSucceed is a test helper that fails if err is non-nil.
-func mustSucceed(t *testing.T, err error) {
-	t.Helper()
-	if err != nil {
-		t.Fatalf("expected success but got error: %v", err)
-	}
-}
-
-// mustFail is a test helper that fails if err is nil.
-func mustFail(t *testing.T, err error) {
-	t.Helper()
-	if err == nil {
-		t.Fatal("expected error but got nil")
-	}
-}
-
-// mustContain checks that err is non-nil and its message contains substr.
-func mustContain(t *testing.T, err error, substr string) {
-	t.Helper()
-	if err == nil {
-		t.Fatalf("expected error containing %q but got nil", substr)
-	}
-	if !strings.Contains(err.Error(), substr) {
-		t.Fatalf("expected error to contain %q, got: %s", substr, err.Error())
-	}
-}
-
-func TestValidateConfigValid(t *testing.T) {
-	t.Run("minimal config", func(t *testing.T) {
-		raw := baseConfig()
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-
-		if pv, _ := result["python_version"].(string); pv != "3.11" {
-			t.Fatalf("expected python_version '3.11', got %q", pv)
-		}
-		if id, _ := result["image_distro"].(string); id != "debian" {
-			t.Fatalf("expected image_distro 'debian', got %q", id)
-		}
-	})
-
-	t.Run("full config with all optional fields", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version":   "3.12",
-			"image_distro":     "wolfi",
-			"pip_installer":    "uv",
-			"dependencies":     []any{"langchain", "langgraph"},
-			"graphs":           map[string]any{"agent": "./agent.py:graph"},
-			"env":              map[string]any{"FOO": "bar"},
-			"dockerfile_lines": []any{"RUN apt-get update"},
-			"auth":             map[string]any{"path": "./auth.py:handler"},
-			"encryption":       map[string]any{"path": "./enc.py:enc"},
-			"http":             map[string]any{"app": "./app.py:app"},
-			"keep_pkg_tools":   true,
-			"api_version":      "0.8",
-		}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-}
-
-func TestValidateConfigPythonVersion(t *testing.T) {
-	validVersions := []string{"3.11", "3.12", "3.13"}
-	for _, v := range validVersions {
-		t.Run("valid "+v, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["python_version"] = v
-			_, err := ValidateConfig(raw)
-			mustSucceed(t, err)
-		})
-	}
-
-	t.Run("valid 3.12-slim suffix stripped", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["python_version"] = "3.12-slim"
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	tooOld := []string{"3.10", "3.9"}
-	for _, v := range tooOld {
-		t.Run("too old "+v, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["python_version"] = v
-			_, err := ValidateConfig(raw)
-			mustContain(t, err, "Minimum required version")
-		})
-	}
-
-	badFormat := []struct {
-		version string
-	}{
-		{"3.11.0"},
-		{"3"},
-		{"abc.def"},
-	}
-	for _, tc := range badFormat {
-		t.Run("bad format "+tc.version, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["python_version"] = tc.version
-			_, err := ValidateConfig(raw)
-			mustContain(t, err, "Invalid Python version format")
-		})
-	}
-}
-
-func TestValidateConfigNodeVersion(t *testing.T) {
-	// Need a node graph to trigger node_version validation
-	nodeBase := func() map[string]any {
-		return map[string]any{
-			"dependencies": []any{"langchain"},
-			"graphs":       map[string]any{"agent": "./agent.py:graph"},
-		}
-	}
-
-	t.Run("valid 20", func(t *testing.T) {
-		raw := nodeBase()
-		raw["node_version"] = "20"
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("valid 22", func(t *testing.T) {
-		raw := nodeBase()
-		raw["node_version"] = "22"
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("too old 18", func(t *testing.T) {
-		raw := nodeBase()
-		raw["node_version"] = "18"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Minimum required version is 20")
-	})
-
-	t.Run("minor version 20.1", func(t *testing.T) {
-		raw := nodeBase()
-		raw["node_version"] = "20.1"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "major version only")
-	})
-}
-
-func TestValidateConfigGraphs(t *testing.T) {
-	t.Run("empty graphs", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["graphs"] = map[string]any{}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "No graphs found")
-	})
-
-	t.Run("missing graphs key", func(t *testing.T) {
-		raw := map[string]any{
-			"dependencies": []any{"langchain"},
-		}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "No graphs found")
-	})
-}
-
-func TestValidateConfigImageDistro(t *testing.T) {
-	validDistroTests := []string{"debian", "wolfi", "bookworm"}
-	for _, d := range validDistroTests {
-		t.Run("valid "+d, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["image_distro"] = d
-			_, err := ValidateConfig(raw)
-			mustSucceed(t, err)
-		})
-	}
-
-	t.Run("bullseye deprecated", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["image_distro"] = "bullseye"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "deprecated")
-	})
-
-	t.Run("invalid ubuntu", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["image_distro"] = "ubuntu"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid image_distro")
-	})
-
-	t.Run("invalid alpine", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["image_distro"] = "alpine"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid image_distro")
-	})
-
-	t.Run("default is debian", func(t *testing.T) {
-		raw := baseConfig()
-		// no image_distro key
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if id, _ := result["image_distro"].(string); id != "debian" {
-			t.Fatalf("expected default image_distro 'debian', got %q", id)
-		}
-	})
-}
-
-func TestValidateConfigPipInstaller(t *testing.T) {
-	valid := []string{"auto", "pip", "uv"}
-	for _, pi := range valid {
-		t.Run("valid "+pi, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["pip_installer"] = pi
-			_, err := ValidateConfig(raw)
-			mustSucceed(t, err)
-		})
-	}
-
-	invalid := []string{"conda", "uv_lock"}
-	for _, pi := range invalid {
-		t.Run("invalid "+pi, func(t *testing.T) {
-			raw := copyMap(baseConfig())
-			raw["pip_installer"] = pi
-			_, err := ValidateConfig(raw)
-			mustContain(t, err, "Invalid pip_installer")
-		})
-	}
-}
-
-func TestValidateConfigSource(t *testing.T) {
-	t.Run("valid uv source with root", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version": "3.12",
-			"graphs":         map[string]any{"agent": "./agent.py:graph"},
-			"source":         map[string]any{"kind": "uv", "root": "../.."},
-		}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid source kind poetry", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version": "3.12",
-			"graphs":         map[string]any{"agent": "./agent.py:graph"},
-			"source":         map[string]any{"kind": "poetry"},
-		}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid source.kind")
-	})
-
-	t.Run("source as string not object", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["source"] = "not-an-object"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "`source` must be an object")
-	})
-
-	t.Run("uv source with dependencies", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version": "3.12",
-			"graphs":         map[string]any{"agent": "./agent.py:graph"},
-			"source":         map[string]any{"kind": "uv", "root": ".."},
-			"dependencies":   []any{"langchain"},
-		}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Remove `dependencies`")
-	})
-
-	t.Run("uv source with root as number", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version": "3.12",
-			"graphs":         map[string]any{"agent": "./agent.py:graph"},
-			"source":         map[string]any{"kind": "uv", "root": 123},
-		}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "source.root` must be a string")
-	})
-
-	t.Run("uv source with package as number", func(t *testing.T) {
-		raw := map[string]any{
-			"python_version": "3.12",
-			"graphs":         map[string]any{"agent": "./agent.py:graph"},
-			"source":         map[string]any{"kind": "uv", "root": "..", "package": 123},
-		}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "source.package` must be a non-empty string")
-	})
-}
-
-func TestValidateConfigAPIVersion(t *testing.T) {
-	t.Run("valid 0.8", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["api_version"] = "0.8"
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("valid 0.8.1", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["api_version"] = "0.8.1"
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid abc", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["api_version"] = "abc"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid version format")
-	})
-
-	t.Run("invalid 1.2.3.4 too many parts", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["api_version"] = "1.2.3.4"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "major or major.minor")
-	})
-}
-
-func TestValidateConfigMutualExclusion(t *testing.T) {
-	t.Run("both _INTERNAL_docker_tag and api_version", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["_INTERNAL_docker_tag"] = "some-tag"
-		raw["api_version"] = "0.8"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Cannot specify both")
-	})
-}
-
-func TestValidateConfigAuthPath(t *testing.T) {
-	t.Run("valid auth path with colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["auth"] = map[string]any{"path": "./auth.py:handler"}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid auth path without colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["auth"] = map[string]any{"path": "../../examples/my_app.py"}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid auth.path format")
-	})
-}
-
-func TestValidateConfigEncryptionPath(t *testing.T) {
-	t.Run("valid encryption path with colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["encryption"] = map[string]any{"path": "./enc.py:enc"}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid encryption path without colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["encryption"] = map[string]any{"path": "./enc.py"}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid encryption.path format")
-	})
-}
-
-func TestValidateConfigHTTPApp(t *testing.T) {
-	t.Run("valid http app with colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["http"] = map[string]any{"app": "./app.py:app"}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid http app without colon", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["http"] = map[string]any{"app": "./app.py"}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid http.app format")
-	})
-}
-
-func TestValidateConfigKeepPkgTools(t *testing.T) {
-	t.Run("bool true", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["keep_pkg_tools"] = true
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("valid list", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["keep_pkg_tools"] = []any{"pip", "wheel"}
-		_, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-	})
-
-	t.Run("invalid list item", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["keep_pkg_tools"] = []any{"invalid"}
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid keep_pkg_tools")
-	})
-
-	t.Run("invalid string type", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["keep_pkg_tools"] = "string"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "Invalid keep_pkg_tools")
-	})
-}
-
-func TestValidateConfigLegacyKeys(t *testing.T) {
-	t.Run("project_root legacy", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["project_root"] = ".."
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "no longer supported")
-	})
-
-	t.Run("package legacy", func(t *testing.T) {
-		raw := copyMap(baseConfig())
-		raw["package"] = "foo"
-		_, err := ValidateConfig(raw)
-		mustContain(t, err, "no longer supported")
-	})
-}
-
-func TestValidateConfigNodeGraphDetection(t *testing.T) {
-	t.Run("ts extension auto-sets node_version", func(t *testing.T) {
-		raw := map[string]any{
-			"dependencies": []any{"langchain"},
-			"graphs":       map[string]any{"agent": "./agent.py:graph", "bot": "./bot.ts:bot"},
-		}
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if nv, _ := result["node_version"].(string); nv != "20" {
-			t.Fatalf("expected node_version '20', got %q", nv)
-		}
-	})
-
-	t.Run("js extension auto-sets node_version", func(t *testing.T) {
-		raw := map[string]any{
-			"dependencies": []any{"langchain"},
-			"graphs":       map[string]any{"agent": "./agent.py:graph", "bot": "./bot.js:bot"},
-		}
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if nv, _ := result["node_version"].(string); nv != "20" {
-			t.Fatalf("expected node_version '20', got %q", nv)
-		}
-	})
-
-	t.Run("py extension does not set node_version", func(t *testing.T) {
-		raw := baseConfig()
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if nv, _ := result["node_version"].(string); nv != "" {
-			t.Fatalf("expected node_version '', got %q", nv)
-		}
-	})
-}
-
-func TestGetUnknownKeys(t *testing.T) {
-	t.Run("typo suggests correction", func(t *testing.T) {
-		raw := map[string]any{
-			"grpahs":       map[string]any{"agent": "./agent.py:graph"},
-			"dependencies": []any{"langchain"},
-		}
-		warnings := GetUnknownKeys(raw)
-		found := false
-		for _, w := range warnings {
-			if strings.Contains(w, "did you mean 'graphs'") {
-				found = true
-				break
-			}
-		}
-		if !found {
-			t.Fatalf("expected warning suggesting 'graphs', got: %v", warnings)
-		}
-	})
-
-	t.Run("totally unknown key", func(t *testing.T) {
-		raw := map[string]any{
-			"totally_unknown": "value",
-			"graphs":          map[string]any{"agent": "./agent.py:graph"},
-			"dependencies":    []any{"langchain"},
-		}
-		warnings := GetUnknownKeys(raw)
-		found := false
-		for _, w := range warnings {
-			if strings.Contains(w, "not a recognized config field") {
-				found = true
-				break
-			}
-		}
-		if !found {
-			t.Fatalf("expected 'not a recognized config field' warning, got: %v", warnings)
-		}
-	})
-
-	t.Run("only known keys gives no warnings", func(t *testing.T) {
-		raw := baseConfig()
-		warnings := GetUnknownKeys(raw)
-		if len(warnings) != 0 {
-			t.Fatalf("expected no warnings, got: %v", warnings)
-		}
-	})
-}
-
-func TestValidateConfigMultiplatform(t *testing.T) {
-	t.Run("only JS graphs", func(t *testing.T) {
-		raw := map[string]any{
-			"graphs": map[string]any{"bot": "./bot.ts:bot"},
-		}
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if nv, _ := result["node_version"].(string); nv != "20" {
-			t.Fatalf("expected node_version '20', got %q", nv)
-		}
-		if pv, _ := result["python_version"].(string); pv != "" {
-			t.Fatalf("expected python_version '', got %q", pv)
-		}
-	})
-
-	t.Run("only Python graphs", func(t *testing.T) {
-		raw := baseConfig()
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if pv, _ := result["python_version"].(string); pv != "3.11" {
-			t.Fatalf("expected python_version '3.11', got %q", pv)
-		}
-		if nv, _ := result["node_version"].(string); nv != "" {
-			t.Fatalf("expected node_version '', got %q", nv)
-		}
-	})
-
-	t.Run("mixed graphs", func(t *testing.T) {
-		raw := map[string]any{
-			"dependencies": []any{"langchain"},
-			"graphs":       map[string]any{"agent": "./agent.py:graph", "bot": "./bot.ts:bot"},
-		}
-		result, err := ValidateConfig(raw)
-		mustSucceed(t, err)
-		if pv, _ := result["python_version"].(string); pv != "3.11" {
-			t.Fatalf("expected python_version '3.11', got %q", pv)
-		}
-		if nv, _ := result["node_version"].(string); nv != "20" {
-			t.Fatalf("expected node_version '20', got %q", nv)
-		}
-	})
-}

libs/cli/internal/config/uvlock_test.go

@@ -1,804 +0,0 @@
-package config
-
-import (
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-)
-
-// ---------------------------------------------------------------------------
-// Helper: write a uv-lock workspace fixture
-// ---------------------------------------------------------------------------
-
-type workspaceOpts struct {
-	// Relative directory (within project_root) that holds langgraph.json.
-	// Default: "deploy/agent"
-	configRelativeDir string
-	// Extra TOML appended to the root pyproject.toml (e.g. [tool.uv.sources]).
-	rootSources string
-	// Extra TOML appended to the agent pyproject.toml (e.g. [tool.uv.sources]).
-	agentSources string
-	// Extra TOML appended to the shared lib pyproject.toml (e.g. [tool.uv] section).
-	sharedUvConfig string
-	// Custom agent dependencies list.  When nil the default is used.
-	agentDependencies []string
-	// Additional files to create: relative-path (from project_root) -> content.
-	extraFiles map[string]string
-}
-
-// writeUvLockWorkspace creates the standard multi-package uv workspace used
-// by the Python test_config_to_docker_uv_lock* test suite and returns
-// (projectRoot, configPath).
-//
-// Layout:
-//
-//	workspace/
-//	  pyproject.toml          [project] name="workspace-root" + [tool.uv.workspace]
-//	  uv.lock
-//	  apps/agent/             package "agent"
-//	    pyproject.toml
-//	    src/agent/graph.py
-//	  libs/shared/            package "shared"
-//	    pyproject.toml
-//	    src/shared/auth.py
-//	  libs/extra/             package "extra" (not a dep of agent)
-//	    pyproject.toml
-//	    src/extra/graph.py
-//	  deploy/agent/           config directory (configRelativeDir)
-//	    langgraph.json
-func writeUvLockWorkspace(t *testing.T, opts workspaceOpts) (string, string) {
-	t.Helper()
-	base := t.TempDir()
-	projectRoot := filepath.Join(base, "workspace")
-
-	configRelDir := opts.configRelativeDir
-	if configRelDir == "" {
-		configRelDir = "deploy/agent"
-	}
-
-	configDir := filepath.Join(projectRoot, configRelDir)
-	sharedDir := filepath.Join(projectRoot, "libs", "shared")
-	extraDir := filepath.Join(projectRoot, "libs", "extra")
-	deployDir := filepath.Join(projectRoot, "deploy", "agent")
-
-	for _, d := range []string{configDir, sharedDir, extraDir, deployDir} {
-		if err := os.MkdirAll(d, 0o755); err != nil {
-			t.Fatalf("MkdirAll(%q): %v", d, err)
-		}
-	}
-
-	// -- root pyproject.toml -------------------------------------------------
-	rootSources := opts.rootSources
-	writeFile(t, filepath.Join(projectRoot, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"workspace-root\"\n"+
-			"version = \"0.1.0\"\n"+
-			"\n"+
-			"[tool.uv.workspace]\n"+
-			"members = [\"apps/*\", \"libs/*\"]\n"+
-			"\n"+
-			rootSources+"\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	// -- uv.lock -------------------------------------------------------------
-	writeFile(t, filepath.Join(projectRoot, "uv.lock"), "# uv lock file\n")
-
-	// -- agent pyproject.toml ------------------------------------------------
-	agentDir := filepath.Join(projectRoot, "apps", "agent")
-	if err := os.MkdirAll(agentDir, 0o755); err != nil {
-		t.Fatalf("MkdirAll: %v", err)
-	}
-
-	agentDeps := opts.agentDependencies
-	if agentDeps == nil {
-		agentDeps = []string{"shared", "httpx>=0.28"}
-	}
-	depsList := "[\"" + strings.Join(agentDeps, "\", \"") + "\"]"
-
-	agentSources := opts.agentSources
-	writeFile(t, filepath.Join(agentDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"agent\"\n"+
-			"version = \"0.1.0\"\n"+
-			"dependencies = "+depsList+"\n"+
-			"\n"+
-			agentSources+"\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	// -- shared pyproject.toml -----------------------------------------------
-	sharedUvConfig := opts.sharedUvConfig
-	writeFile(t, filepath.Join(sharedDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"shared\"\n"+
-			"version = \"0.1.0\"\n"+
-			"dependencies = [\"anyio>=4\"]\n"+
-			"\n"+
-			sharedUvConfig+"\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	// -- extra pyproject.toml ------------------------------------------------
-	writeFile(t, filepath.Join(extraDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"extra\"\n"+
-			"version = \"0.1.0\"\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	// -- source files --------------------------------------------------------
-	writeFile(t, filepath.Join(agentDir, "src", "agent", "graph.py"), "")
-	writeFile(t, filepath.Join(sharedDir, "src", "shared", "auth.py"), "")
-	writeFile(t, filepath.Join(extraDir, "src", "extra", "graph.py"), "")
-
-	// -- config file ---------------------------------------------------------
-	configPath := filepath.Join(deployDir, "langgraph.json")
-	writeFile(t, configPath, "{}\n")
-
-	// If configRelativeDir is non-default, also place langgraph.json there.
-	if configRelDir != "deploy/agent" {
-		altConfigPath := filepath.Join(configDir, "langgraph.json")
-		writeFile(t, altConfigPath, "{}\n")
-		configPath = altConfigPath
-	}
-
-	// -- extra files ---------------------------------------------------------
-	for relPath, content := range opts.extraFiles {
-		writeFile(t, filepath.Join(projectRoot, relPath), content)
-	}
-
-	return projectRoot, configPath
-}
-
-// ---------------------------------------------------------------------------
-// Tests
-// ---------------------------------------------------------------------------
-
-func TestUvLockBasic(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { workspace = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	docker, contexts, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	// Core commands.
-	assertContains(t, docker, "uv pip install --system")
-	assertContains(t, docker,
-		"uv export --package 'agent' --frozen --no-hashes --no-emit-project --no-emit-workspace")
-
-	// Copy project metadata for uv export.
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root pyproject.toml /tmp/uv_export/project/pyproject.toml")
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root uv.lock /tmp/uv_export/project/uv.lock")
-
-	// Additional build contexts.
-	if _, ok := contexts["uv-workspace-root"]; !ok {
-		t.Fatal("expected 'uv-workspace-root' in additional contexts")
-	}
-
-	// Workspace packages copied.
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root apps/agent /deps/workspace/apps/agent")
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-	// Unrelated member NOT copied.
-	assertNotContains(t, docker,
-		"libs/extra /deps/workspace/libs/extra")
-
-	// Install order: shared before agent.
-	assertContains(t, docker, "WORKDIR /deps/workspace/libs/shared")
-	assertContains(t, docker, "WORKDIR /deps/workspace/apps/agent")
-	sharedInstall := "uv pip install --system --no-cache-dir -c /api/constraints.txt --no-deps -e ."
-	assertContains(t, docker, sharedInstall)
-
-	// Ordering: shared COPY < shared WORKDIR < agent COPY < agent WORKDIR.
-	sharedCopy := "COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared"
-	sharedWD := "WORKDIR /deps/workspace/libs/shared"
-	agentCopy := "COPY --from=uv-workspace-root apps/agent /deps/workspace/apps/agent"
-	agentWD := "WORKDIR /deps/workspace/apps/agent"
-	if strings.Index(docker, sharedCopy) >= strings.Index(docker, sharedWD) {
-		t.Error("shared COPY should appear before shared WORKDIR")
-	}
-	if strings.Index(docker, sharedWD) >= strings.Index(docker, agentCopy) {
-		t.Error("shared WORKDIR should appear before agent COPY")
-	}
-	if strings.Index(docker, sharedWD) >= strings.Index(docker, agentWD) {
-		t.Error("shared WORKDIR should appear before agent WORKDIR")
-	}
-
-	// No legacy dep-loop patterns.
-	assertNotContains(t, docker, "for dep in /deps/*")
-	assertNotContains(t, docker, "# -- Installing workspace packages --")
-	assertContains(t, docker, "WORKDIR /tmp/uv_export/project")
-	assertNotContains(t, docker, "RUN cd ")
-
-	// Rewritten paths in env vars (Go JSON uses compact format without spaces).
-	assertContains(t, docker,
-		`"/deps/workspace/libs/shared/src/shared/auth.py:create_auth"`)
-	assertContains(t, docker,
-		`"/deps/workspace/apps/agent/src/agent/graph.py:graph"`)
-
-	// Cleanup.
-	assertContains(t, docker, "rm /usr/bin/uv /usr/bin/uvx")
-}
-
-func TestUvLockHonorsRootWorkspaceSources(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		rootSources: "[tool.uv.sources]\nshared = { workspace = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-	assertContains(t, docker,
-		`"/deps/workspace/libs/shared/src/shared/auth.py:create_auth"`)
-}
-
-func TestUvLockIgnoresUnrelatedWorkspacePackageSources(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { workspace = true }",
-	})
-
-	// Add badlib with [tool.uv.sources] pointing outside (an unrelated member).
-	badlibDir := filepath.Join(projectRoot, "libs", "badlib")
-	writeFile(t, filepath.Join(badlibDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"badlib\"\n"+
-			"version = \"0.1.0\"\n"+
-			"\n"+
-			"[tool.uv.sources]\n"+
-			"outside = { path = \"../outside\" }\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-	assertNotContains(t, docker,
-		"COPY --from=uv-workspace-root libs/badlib /deps/workspace/libs/badlib")
-}
-
-func TestUvLockIgnoresUnrelatedRootSources(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		rootSources: "[tool.uv.sources]\nshared = { workspace = true }\nunused = { path = \"libs/extra\", editable = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-	assertNotContains(t, docker,
-		"COPY --from=uv-workspace-root libs/extra /deps/workspace/libs/extra")
-}
-
-func TestUvLockValidatesRootPathSourcesRelativeToProjectRoot(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		rootSources: "[tool.uv.sources]\nshared = { path = \"../outside\", editable = true }",
-	})
-
-	// Create the outside directory the source points to.
-	outsideDir := filepath.Join(filepath.Dir(projectRoot), "outside")
-	writeFile(t, filepath.Join(outsideDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"shared\"\n"+
-			"version = \"0.1.0\"\n")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for path outside project_root")
-	}
-	assertContains(t, err.Error(), "outside project_root")
-}
-
-func TestUvLockRequiresExplicitWorkspaceSources(t *testing.T) {
-	// No agent_sources or root_sources => shared is NOT a workspace dep.
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error because shared is not an explicit workspace source")
-	}
-	assertContains(t, err.Error(), "not inside the target package 'agent'")
-}
-
-func TestUvLockAcceptsPathWorkspaceSources(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { path = \"../../libs/shared\", editable = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-}
-
-func TestUvLockRejectsPackageFalseWorkspaceDependency(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources:   "[tool.uv.sources]\nshared = { workspace = true }",
-		sharedUvConfig: "[tool.uv]\npackage = false",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for package = false workspace dependency")
-	}
-	assertContains(t, err.Error(), "tool.uv.package = false")
-}
-
-func TestUvLockAcceptsRootPathWorkspaceSources(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		rootSources: "[tool.uv.sources]\nshared = { path = \"libs/shared\", editable = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"auth":   map[string]any{"path": "../../libs/shared/src/shared/auth.py:create_auth"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"COPY --from=uv-workspace-root libs/shared /deps/workspace/libs/shared")
-	assertContains(t, docker,
-		`"/deps/workspace/libs/shared/src/shared/auth.py:create_auth"`)
-}
-
-func TestUvLockRejectsMismatchedPathWorkspaceSources(t *testing.T) {
-	// agent sources point to libs/extra with the name "shared" -> mismatch.
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { path = \"../../libs/extra\", editable = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for mismatched path workspace sources")
-	}
-	assertContains(t, err.Error(), "dependency name and the workspace package name must match")
-}
-
-func TestUvLockDetectsJsPmFromTargetPackageRoot(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { workspace = true }",
-	})
-
-	agentDir := filepath.Join(projectRoot, "apps", "agent")
-	writeFile(t, filepath.Join(agentDir, "package.json"), "{\"packageManager\":\"pnpm@9.0.0\"}\n")
-	writeFile(t, filepath.Join(agentDir, "pnpm-lock.yaml"), "lockfileVersion: 9.0\n")
-	writeFile(t, filepath.Join(agentDir, "ui.tsx"), "export const ui = null;\n")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"ui":     map[string]any{"agent": "../../apps/agent/ui.tsx"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker, "WORKDIR /deps/workspace/apps/agent")
-	assertContains(t, docker,
-		"RUN pnpm i --frozen-lockfile && tsx /api/langgraph_api/js/build.mts")
-	assertContains(t, docker, `/deps/workspace/apps/agent/ui.tsx`)
-}
-
-func TestUvLockUsesWorkdirForJsInstallWithSpecialChars(t *testing.T) {
-	projectRoot, _ := writeUvLockWorkspace(t, workspaceOpts{
-		configRelativeDir: "apps/agent;echo pwned",
-	})
-
-	// The custom configRelativeDir creates its own langgraph.json.
-	// We need to place the agent pyproject.toml at this directory.
-	agentDir := filepath.Join(projectRoot, "apps", "agent;echo pwned")
-	writeFile(t, filepath.Join(agentDir, "package.json"), "{\"packageManager\":\"pnpm@9.0.0\"}\n")
-	writeFile(t, filepath.Join(agentDir, "pnpm-lock.yaml"), "lockfileVersion: 9.0\n")
-	writeFile(t, filepath.Join(agentDir, "ui.tsx"), "export const ui = null;\n")
-	writeFile(t, filepath.Join(agentDir, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"agent\"\n"+
-			"version = \"0.1.0\"\n"+
-			"dependencies = [\"shared\", \"httpx>=0.28\"]\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-	writeFile(t, filepath.Join(agentDir, "src", "agent", "graph.py"), "")
-
-	// Remove the default apps/agent so there's no duplicate package name.
-	if err := os.RemoveAll(filepath.Join(projectRoot, "apps", "agent")); err != nil {
-		t.Fatal(err)
-	}
-
-	// Update workspace members to include the special-char directory.
-	writeFile(t, filepath.Join(projectRoot, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"workspace-root\"\n"+
-			"version = \"0.1.0\"\n"+
-			"\n"+
-			"[tool.uv.workspace]\n"+
-			"members = [\"apps/*\", \"libs/*\"]\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-
-	configPath := filepath.Join(agentDir, "langgraph.json")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "./src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-		"ui":     map[string]any{"agent": "./ui.tsx"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker, "WORKDIR /deps/workspace/apps/agent;echo pwned")
-	assertContains(t, docker,
-		"RUN pnpm i --frozen-lockfile && tsx /api/langgraph_api/js/build.mts")
-	assertNotContains(t, docker, "RUN cd /deps/workspace/apps/agent;echo pwned")
-}
-
-func TestUvLockSupportsSingleUvProjectRoot(t *testing.T) {
-	base := t.TempDir()
-	projectRoot := filepath.Join(base, "single")
-	if err := os.MkdirAll(projectRoot, 0o755); err != nil {
-		t.Fatal(err)
-	}
-
-	writeFile(t, filepath.Join(projectRoot, "uv.lock"), "# uv lock file\n")
-	writeFile(t, filepath.Join(projectRoot, "pyproject.toml"),
-		"[project]\n"+
-			"name = \"single-app\"\n"+
-			"version = \"0.1.0\"\n"+
-			"dependencies = [\"httpx>=0.28\"]\n"+
-			"\n"+
-			"[build-system]\n"+
-			"requires = [\"setuptools>=61\"]\n"+
-			"build-backend = \"setuptools.build_meta\"\n")
-	configPath := filepath.Join(projectRoot, "langgraph.json")
-	writeFile(t, configPath, "{}\n")
-	writeFile(t, filepath.Join(projectRoot, "src", "agent.py"), "graph = object()\n")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs":         map[string]any{"agent": "./src/agent.py:graph"},
-		"source":         map[string]any{"kind": "uv"},
-	})
-
-	docker, contexts, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	assertContains(t, docker,
-		"uv export --package 'single-app' --frozen --no-hashes --no-emit-project --no-emit-workspace")
-	assertContains(t, docker, `"/deps/workspace/src/agent.py:graph"`)
-	if len(contexts) != 0 {
-		t.Fatalf("expected no additional contexts for single-project root, got %d: %v",
-			len(contexts), contexts)
-	}
-}
-
-func TestUvLockRejectsInvalidSourcePackageType(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-	// Override the validated source.package to an integer.
-	cfg["source"].(map[string]any)["package"] = 123
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for non-string source.package")
-	}
-	assertContains(t, err.Error(), "`source.package` must be a non-empty string")
-}
-
-func TestUvLockRejectsPathsOutsideTargetClosure(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentSources: "[tool.uv.sources]\nshared = { workspace = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			// Graph path points into libs/extra which is NOT a dependency of agent.
-			"agent": "../../libs/extra/src/extra/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for graph path outside target closure")
-	}
-	assertContains(t, err.Error(), "not inside the target package 'agent'")
-}
-
-func TestUvLockRejectsUnrelatedMemberWhenRootInClosure(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentDependencies: []string{"workspace-root", "shared", "httpx>=0.28"},
-		rootSources:       "[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
-		agentSources:      "[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
-	})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			// extra is a workspace member but NOT a dependency of agent.
-			"agent": "../../libs/extra/src/extra/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for unrelated member when root is in closure")
-	}
-	assertContains(t, err.Error(), "not inside the target package 'agent'")
-}
-
-func TestUvLockRootPackageCopySkipsUnrelatedMembers(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{
-		agentDependencies: []string{"workspace-root", "shared", "httpx>=0.28"},
-		rootSources:       "[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
-		agentSources:      "[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
-	})
-
-	// Add files in the workspace root package itself.
-	writeFile(t, filepath.Join(projectRoot, "src", "workspace_root", "__init__.py"), "__all__ = []\n")
-	writeFile(t, filepath.Join(projectRoot, "README.md"), "workspace root package\n")
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs": map[string]any{
-			"agent": "../../apps/agent/src/agent/graph.py:graph",
-		},
-		"source": map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	docker, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err != nil {
-		t.Fatalf("ConfigToDocker: %v", err)
-	}
-
-	// Should NOT do a blanket COPY of the whole workspace root.
-	assertNotContains(t, docker, "COPY --from=uv-workspace-root . /deps/workspace")
-	// Should copy specific entries.
-	assertContains(t, docker, "COPY --from=uv-workspace-root src /deps/workspace/src")
-	assertContains(t, docker, "COPY --from=uv-workspace-root README.md /deps/workspace/README.md")
-	// Should NOT copy unrelated member dirs.
-	assertNotContains(t, docker,
-		"COPY --from=uv-workspace-root libs/extra /deps/workspace/libs/extra")
-	// Should install workspace root from /deps/workspace.
-	assertContains(t, docker, "WORKDIR /deps/workspace")
-	assertContains(t, docker,
-		"uv pip install --system --no-cache-dir -c /api/constraints.txt --no-deps -e .")
-}
-
-func TestUvLockMissingLockfile(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{})
-
-	// Remove uv.lock.
-	if err := os.Remove(filepath.Join(projectRoot, "uv.lock")); err != nil {
-		t.Fatal(err)
-	}
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs":         map[string]any{"agent": "../../apps/agent/src/agent/graph.py:graph"},
-		"source":         map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for missing uv.lock")
-	}
-	assertContains(t, err.Error(), "No uv.lock found")
-}
-
-func TestUvLockMissingPyproject(t *testing.T) {
-	projectRoot, configPath := writeUvLockWorkspace(t, workspaceOpts{})
-
-	// Remove root pyproject.toml.
-	if err := os.Remove(filepath.Join(projectRoot, "pyproject.toml")); err != nil {
-		t.Fatal(err)
-	}
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs":         map[string]any{"agent": "../../apps/agent/src/agent/graph.py:graph"},
-		"source":         map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.47",
-	})
-	if err == nil {
-		t.Fatal("expected error for missing pyproject.toml")
-	}
-	assertContains(t, err.Error(), "No pyproject.toml found")
-}
-
-func TestUvLockOldImage(t *testing.T) {
-	_, configPath := writeUvLockWorkspace(t, workspaceOpts{})
-
-	cfg := mustValidate(t, map[string]any{
-		"python_version": "3.11",
-		"graphs":         map[string]any{"agent": "../../apps/agent/src/agent/graph.py:graph"},
-		"source":         map[string]any{"kind": "uv", "root": "../..", "package": "agent"},
-	})
-
-	_, _, err := ConfigToDocker(configPath, cfg, DockerOpts{
-		BaseImage: "langchain/langgraph-api:0.2.46",
-	})
-	if err == nil {
-		t.Fatal("expected error for old image without uv support")
-	}
-	assertContains(t, err.Error(), "requires a base image with uv support")
-}

libs/cli/internal/deploy/client.go

@@ -1,272 +0,0 @@
-// Package deploy provides an HTTP client for the LangGraph host backend
-// deployment service.
-package deploy
-
-import (
-	"bytes"
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"net/url"
-	"strings"
-	"time"
-)
-
-// Secret represents a name/value pair sent as a deployment secret.
-type Secret struct {
-	Name  string `json:"name"`
-	Value string `json:"value"`
-}
-
-// HostBackendClient is a minimal JSON HTTP client for the host backend
-// deployment service.
-type HostBackendClient struct {
-	BaseURL  string
-	APIKey   string
-	TenantID string
-	client   *http.Client
-}
-
-// retryTransport wraps an http.RoundTripper and retries failed requests.
-type retryTransport struct {
-	base    http.RoundTripper
-	retries int
-}
-
-func (t *retryTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	var resp *http.Response
-	var err error
-
-	// We need to buffer the body so we can replay it on retries.
-	var bodyBytes []byte
-	if req.Body != nil {
-		bodyBytes, err = io.ReadAll(req.Body)
-		if err != nil {
-			return nil, err
-		}
-		req.Body.Close()
-	}
-
-	for attempt := 0; attempt <= t.retries; attempt++ {
-		if bodyBytes != nil {
-			req.Body = io.NopCloser(bytes.NewReader(bodyBytes))
-		}
-		resp, err = t.base.RoundTrip(req)
-		if err == nil {
-			return resp, nil
-		}
-		// Only retry on transport-level errors; do not retry on HTTP error
-		// status codes (the caller handles those).
-	}
-	return resp, err
-}
-
-// NewClient creates a new HostBackendClient. The baseURL is stripped of any
-// trailing slash. The underlying http.Client uses a 30-second timeout and
-// retries transport-level failures up to 3 times.
-func NewClient(baseURL, apiKey string) *HostBackendClient {
-	return &HostBackendClient{
-		BaseURL:  strings.TrimRight(baseURL, "/"),
-		APIKey:   apiKey,
-		TenantID: "",
-		client: &http.Client{
-			Timeout: 30 * time.Second,
-			Transport: &retryTransport{
-				base:    http.DefaultTransport,
-				retries: 3,
-			},
-		},
-	}
-}
-
-// request executes an HTTP request against the host backend and returns the
-// parsed JSON response. It attaches required headers and handles errors.
-func (c *HostBackendClient) request(method, path string, payload map[string]any, params map[string]string) (map[string]any, error) {
-	fullURL := c.BaseURL + path
-
-	// Append query parameters.
-	if len(params) > 0 {
-		q := url.Values{}
-		for k, v := range params {
-			q.Set(k, v)
-		}
-		fullURL += "?" + q.Encode()
-	}
-
-	var body io.Reader
-	if payload != nil {
-		data, err := json.Marshal(payload)
-		if err != nil {
-			return nil, fmt.Errorf("marshalling request payload: %w", err)
-		}
-		body = bytes.NewReader(data)
-	}
-
-	req, err := http.NewRequest(method, fullURL, body)
-	if err != nil {
-		return nil, fmt.Errorf("creating request: %w", err)
-	}
-
-	req.Header.Set("X-Api-Key", c.APIKey)
-	req.Header.Set("Accept", "application/json")
-	if payload != nil {
-		req.Header.Set("Content-Type", "application/json")
-	}
-	if c.TenantID != "" {
-		req.Header.Set("X-Tenant-ID", c.TenantID)
-	}
-
-	resp, err := c.client.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("%s %s: %w", method, path, err)
-	}
-	defer resp.Body.Close()
-
-	respBody, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("reading response from %s: %w", path, err)
-	}
-
-	if resp.StatusCode >= 400 {
-		detail := string(respBody)
-		if detail == "" {
-			detail = fmt.Sprintf("%d", resp.StatusCode)
-		}
-		return nil, fmt.Errorf("%s %s failed with status %d: %s", method, path, resp.StatusCode, detail)
-	}
-
-	if len(respBody) == 0 {
-		return nil, nil
-	}
-
-	var result map[string]any
-	if err := json.Unmarshal(respBody, &result); err != nil {
-		return nil, fmt.Errorf("failed to decode response from %s: %w", path, err)
-	}
-	return result, nil
-}
-
-// requestNoBody is a convenience wrapper for requests that return no parsed body.
-func (c *HostBackendClient) requestNoBody(method, path string, payload map[string]any, params map[string]string) error {
-	_, err := c.request(method, path, payload, params)
-	return err
-}
-
-// CreateDeployment creates a new deployment.
-func (c *HostBackendClient) CreateDeployment(name, deploymentType, source string, configPath string, secrets []Secret) (map[string]any, error) {
-	sourceRevisionConfig := map[string]any{}
-	if source == "internal_source" && configPath != "" {
-		sourceRevisionConfig["langgraph_config_path"] = configPath
-	}
-
-	payload := map[string]any{
-		"name":                   name,
-		"source":                 source,
-		"source_config":          map[string]any{"deployment_type": deploymentType},
-		"source_revision_config": sourceRevisionConfig,
-	}
-	if secrets != nil {
-		payload["secrets"] = secrets
-	}
-	return c.request("POST", "/v2/deployments", payload, nil)
-}
-
-// ListDeployments lists deployments, optionally filtering by name.
-func (c *HostBackendClient) ListDeployments(nameContains string) (map[string]any, error) {
-	params := map[string]string{"name_contains": nameContains}
-	return c.request("GET", "/v2/deployments", nil, params)
-}
-
-// GetDeployment retrieves a single deployment by ID.
-func (c *HostBackendClient) GetDeployment(deploymentID string) (map[string]any, error) {
-	return c.request("GET", fmt.Sprintf("/v2/deployments/%s", deploymentID), nil, nil)
-}
-
-// DeleteDeployment deletes a deployment by ID.
-func (c *HostBackendClient) DeleteDeployment(deploymentID string) error {
-	return c.requestNoBody("DELETE", fmt.Sprintf("/v2/deployments/%s", deploymentID), nil, nil)
-}
-
-// RequestPushToken requests a push token for a deployment.
-func (c *HostBackendClient) RequestPushToken(deploymentID string) (map[string]any, error) {
-	return c.request("POST", fmt.Sprintf("/v2/deployments/%s/push-token", deploymentID), nil, nil)
-}
-
-// RequestUploadURL gets a signed URL for uploading the source tarball.
-func (c *HostBackendClient) RequestUploadURL(deploymentID string) (map[string]any, error) {
-	return c.request("POST", fmt.Sprintf("/v2/deployments/%s/upload-url", deploymentID), nil, nil)
-}
-
-// UpdateDeployment triggers a new revision using a pre-pushed Docker image.
-func (c *HostBackendClient) UpdateDeployment(deploymentID, imageURI string, secrets []Secret) (map[string]any, error) {
-	payload := map[string]any{
-		"revision_source":        "internal_docker",
-		"source_revision_config": map[string]any{"image_uri": imageURI},
-	}
-	if secrets != nil {
-		payload["secrets"] = secrets
-	}
-	return c.request("PATCH", fmt.Sprintf("/v2/deployments/%s", deploymentID), payload, nil)
-}
-
-// UpdateDeploymentInternalSource triggers a remote-build revision using an
-// uploaded source tarball.
-func (c *HostBackendClient) UpdateDeploymentInternalSource(
-	deploymentID, sourceTarballPath, configPath string,
-	secrets []Secret,
-	installCommand, buildCommand string,
-) (map[string]any, error) {
-	payload := map[string]any{
-		"revision_source": "internal_source",
-		"source_revision_config": map[string]any{
-			"source_tarball_path":   sourceTarballPath,
-			"langgraph_config_path": configPath,
-		},
-	}
-
-	sourceConfig := map[string]any{}
-	if installCommand != "" {
-		sourceConfig["install_command"] = installCommand
-	}
-	if buildCommand != "" {
-		sourceConfig["build_command"] = buildCommand
-	}
-	if len(sourceConfig) > 0 {
-		payload["source_config"] = sourceConfig
-	}
-
-	if secrets != nil {
-		payload["secrets"] = secrets
-	}
-	return c.request("PATCH", fmt.Sprintf("/v2/deployments/%s", deploymentID), payload, nil)
-}
-
-// ListRevisions lists revisions for a deployment.
-func (c *HostBackendClient) ListRevisions(deploymentID string, limit int) (map[string]any, error) {
-	return c.request("GET", fmt.Sprintf("/v2/deployments/%s/revisions", deploymentID), nil, map[string]string{
-		"limit": fmt.Sprintf("%d", limit),
-	})
-}
-
-// GetRevision retrieves a single revision.
-func (c *HostBackendClient) GetRevision(deploymentID, revisionID string) (map[string]any, error) {
-	return c.request("GET", fmt.Sprintf("/v2/deployments/%s/revisions/%s", deploymentID, revisionID), nil, nil)
-}
-
-// GetBuildLogs retrieves build logs for a revision.
-func (c *HostBackendClient) GetBuildLogs(projectID, revisionID string, payload map[string]any) (map[string]any, error) {
-	return c.request("POST", fmt.Sprintf("/v1/projects/%s/revisions/%s/build_logs", projectID, revisionID), payload, nil)
-}
-
-// GetDeployLogs retrieves deploy logs. If revisionID is non-empty, it is
-// included in the path to scope the logs.
-func (c *HostBackendClient) GetDeployLogs(projectID string, payload map[string]any, revisionID string) (map[string]any, error) {
-	var path string
-	if revisionID != "" {
-		path = fmt.Sprintf("/v1/projects/%s/revisions/%s/deploy_logs", projectID, revisionID)
-	} else {
-		path = fmt.Sprintf("/v1/projects/%s/deploy_logs", projectID)
-	}
-	return c.request("POST", path, payload, nil)
-}

libs/cli/internal/deploy/helpers.go

@@ -1,306 +0,0 @@
-package deploy
-
-import (
-	"bufio"
-	"fmt"
-	"os"
-	"path/filepath"
-	"regexp"
-	"strings"
-	"time"
-)
-
-// APIKeyEnvNames lists the environment variable names checked (in order) when
-// resolving a LangSmith / LangGraph API key.
-var APIKeyEnvNames = []string{
-	"LANGGRAPH_HOST_API_KEY",
-	"LANGSMITH_API_KEY",
-	"LANGCHAIN_API_KEY",
-}
-
-// DefaultHostURL is the default host backend URL.
-const DefaultHostURL = "https://api.host.langchain.com"
-
-// reservedEnvVars contains environment variable names that must not be sent as
-// deployment secrets. The set mirrors the Python CLI's RESERVED_ENV_VARS.
-var reservedEnvVars = map[string]bool{
-	// LANGCHAIN_RESERVED_ENV_VARS from host-backend
-	"LANGCHAIN_TRACING_V2":            true,
-	"LANGSMITH_TRACING_V2":            true,
-	"LANGCHAIN_ENDPOINT":              true,
-	"LANGCHAIN_PROJECT":               true,
-	"LANGSMITH_PROJECT":               true,
-	"LANGSMITH_LANGGRAPH_GIT_REPO":    true,
-	"LANGGRAPH_GIT_REPO_PATH":         true,
-	"LANGCHAIN_API_KEY":               true,
-	"LANGSMITH_CONTROL_PLANE_API_KEY": true,
-	"POSTGRES_URI":                    true,
-	"POSTGRES_PASSWORD":               true,
-	"DATABASE_URI":                    true,
-	"LANGSMITH_LANGGRAPH_GIT_REF":     true,
-	"LANGSMITH_LANGGRAPH_GIT_REF_SHA": true,
-	"LANGGRAPH_AUTH_TYPE":             true,
-	"LANGSMITH_AUTH_ENDPOINT":         true,
-	"LANGSMITH_TENANT_ID":             true,
-	"LANGSMITH_AUTH_VERIFY_TENANT_ID": true,
-	"LANGSMITH_HOST_PROJECT_ID":       true,
-	"LANGSMITH_HOST_PROJECT_NAME":     true,
-	"LANGSMITH_HOST_REVISION_ID":      true,
-	"LOG_JSON":                        true,
-	"LOG_DICT_TRACEBACKS":             true,
-	"REDIS_URI":                       true,
-	"LANGCHAIN_CALLBACKS_BACKGROUND":  true,
-	"DD_TRACE_PSYCOPG_ENABLED":        true,
-	"DD_TRACE_REDIS_ENABLED":          true,
-	"LANGSMITH_DEPLOYMENT_NAME":       true,
-	"LANGGRAPH_CLOUD_LICENSE_KEY":     true,
-	// ALLOWED_SELF_HOSTED_ENV_VARS (rejected for non-self-hosted)
-	"LANGSMITH_API_KEY":   true,
-	"LANGSMITH_ENDPOINT":  true,
-	"POSTGRES_URI_CUSTOM": true,
-	"REDIS_URI_CUSTOM":    true,
-	"PATH":                true,
-	"PORT":                true,
-	"MOUNT_PREFIX":        true,
-	"LSD_ENV":             true,
-	"LSD_DD_API_KEY":      true,
-	"LSD_DD_ENDPOINT":     true,
-	"LSD_DEPLOYMENT_TYPE": true,
-}
-
-var (
-	invalidImageNameChars = regexp.MustCompile(`[^a-z0-9._-]+`)
-	validImageTag         = regexp.MustCompile(`^[A-Za-z0-9_.-]+$`)
-)
-
-// NormalizeImageName sanitizes a deployment/directory name into a valid Docker
-// repository name. Invalid characters are replaced with hyphens and the result
-// is lowercased. Returns "app" if the result would be empty.
-func NormalizeImageName(name string) string {
-	if name == "" {
-		return "app"
-	}
-	slug := invalidImageNameChars.ReplaceAllString(strings.ToLower(name), "-")
-	slug = strings.TrimLeft(slug, "-.")
-	slug = strings.TrimRight(slug, "-.")
-	if slug == "" {
-		return "app"
-	}
-	return slug
-}
-
-// NormalizeImageTag validates and returns a Docker image tag. Tags may only
-// contain [A-Za-z0-9_.-]. Defaults to "latest" when empty.
-func NormalizeImageTag(tag string) (string, error) {
-	if tag == "" {
-		return "latest", nil
-	}
-	if !validImageTag.MatchString(tag) {
-		return "", fmt.Errorf("image tag may only contain characters A-Z, a-z, 0-9, '_', '-', '.'")
-	}
-	return tag, nil
-}
-
-// ResolveAPIKey resolves an API key by checking (in order): the explicit flag
-// value, the provided envVars map, and the process environment. Returns an
-// empty string if no key is found (the caller should prompt the user).
-func ResolveAPIKey(flagValue string, envVars map[string]string) string {
-	if flagValue != "" {
-		return flagValue
-	}
-	for _, keyName := range APIKeyEnvNames {
-		if envVars != nil {
-			if v, ok := envVars[keyName]; ok && v != "" {
-				return v
-			}
-		}
-		if v := os.Getenv(keyName); v != "" {
-			return v
-		}
-	}
-	return ""
-}
-
-// ParseEnvFromConfig resolves environment variables from the langgraph.json
-// config. If the "env" field is a dict (map), those values are used directly.
-// If it is a string, it is treated as a path to a .env file (resolved relative
-// to the config file's directory). Otherwise, a .env file in the config
-// directory is attempted as a fallback.
-func ParseEnvFromConfig(configJSON map[string]any, configPath string) map[string]string {
-	envField, ok := configJSON["env"]
-	if !ok {
-		// Fallback: try .env in config dir.
-		return parseDotEnvFile(filepath.Join(filepath.Dir(configPath), ".env"))
-	}
-
-	// If env is a dict (map[string]any), convert to map[string]string.
-	if envMap, ok := envField.(map[string]any); ok && len(envMap) > 0 {
-		result := make(map[string]string, len(envMap))
-		for k, v := range envMap {
-			result[k] = fmt.Sprintf("%v", v)
-		}
-		return result
-	}
-
-	// If env is a string path, parse that .env file.
-	if envStr, ok := envField.(string); ok && envStr != "" {
-		envPath := filepath.Join(filepath.Dir(configPath), envStr)
-		absPath, err := filepath.Abs(envPath)
-		if err != nil {
-			return map[string]string{}
-		}
-		if _, err := os.Stat(absPath); os.IsNotExist(err) {
-			return map[string]string{}
-		}
-		return parseDotEnvFile(absPath)
-	}
-
-	// Fallback: try .env in config dir.
-	return parseDotEnvFile(filepath.Join(filepath.Dir(configPath), ".env"))
-}
-
-// parseDotEnvFile reads a .env file and returns its key-value pairs. Lines
-// starting with # are treated as comments. Empty values are skipped.
-func parseDotEnvFile(path string) map[string]string {
-	f, err := os.Open(path)
-	if err != nil {
-		return map[string]string{}
-	}
-	defer f.Close()
-
-	result := map[string]string{}
-	scanner := bufio.NewScanner(f)
-	for scanner.Scan() {
-		line := strings.TrimSpace(scanner.Text())
-		if line == "" || strings.HasPrefix(line, "#") {
-			continue
-		}
-		idx := strings.IndexByte(line, '=')
-		if idx < 0 {
-			continue
-		}
-		key := strings.TrimSpace(line[:idx])
-		value := strings.TrimSpace(line[idx+1:])
-		// Strip surrounding quotes if present.
-		if len(value) >= 2 {
-			if (value[0] == '"' && value[len(value)-1] == '"') ||
-				(value[0] == '\'' && value[len(value)-1] == '\'') {
-				value = value[1 : len(value)-1]
-			}
-		}
-		if key != "" && value != "" {
-			result[key] = value
-		}
-	}
-	return result
-}
-
-// FindDeploymentIDByName lists deployments matching the given name and returns
-// the ID of the first exact match. Returns an empty string (and no error) if
-// no exact match is found.
-func FindDeploymentIDByName(client *HostBackendClient, name string) (string, error) {
-	if name == "" {
-		return "", nil
-	}
-	existing, err := client.ListDeployments(name)
-	if err != nil {
-		return "", err
-	}
-	resources, ok := existing["resources"]
-	if !ok {
-		return "", nil
-	}
-	resourceList, ok := resources.([]any)
-	if !ok {
-		return "", nil
-	}
-	for _, item := range resourceList {
-		dep, ok := item.(map[string]any)
-		if !ok {
-			continue
-		}
-		depName, _ := dep["name"].(string)
-		if depName == name {
-			if id, ok := dep["id"]; ok {
-				return fmt.Sprintf("%v", id), nil
-			}
-		}
-	}
-	return "", nil
-}
-
-// ValidateDeploymentSelector ensures at least one of deploymentID or name is
-// provided.
-func ValidateDeploymentSelector(deploymentID, name string) error {
-	if deploymentID != "" {
-		return nil
-	}
-	if name == "" {
-		return fmt.Errorf("either --deployment-id or --name is required")
-	}
-	return nil
-}
-
-// ResolvedReservedEnvVars returns the set of reserved environment variable
-// names that must not be sent as deployment secrets.
-func ResolvedReservedEnvVars() map[string]bool {
-	// Return a copy to prevent callers from mutating the package-level map.
-	result := make(map[string]bool, len(reservedEnvVars))
-	for k, v := range reservedEnvVars {
-		result[k] = v
-	}
-	return result
-}
-
-// TerminalStatuses are deployment statuses that indicate completion.
-var TerminalStatuses = map[string]bool{
-	"DEPLOYED":      true,
-	"CREATE_FAILED": true,
-	"BUILD_FAILED":  true,
-	"DEPLOY_FAILED": true,
-	"SKIPPED":       true,
-}
-
-// PollDeploymentStatus polls a deployment until it reaches a terminal status or times out.
-func PollDeploymentStatus(client *HostBackendClient, deploymentID string, timeoutSeconds, pollIntervalSeconds int, onStatus func(string)) (string, error) {
-	deadline := time.Now().Add(time.Duration(timeoutSeconds) * time.Second)
-	interval := time.Duration(pollIntervalSeconds) * time.Second
-
-	for time.Now().Before(deadline) {
-		resp, err := client.ListRevisions(deploymentID, 1)
-		if err != nil {
-			return "", err
-		}
-		revisions, _ := resp["revisions"].([]any)
-		if len(revisions) == 0 {
-			time.Sleep(interval)
-			continue
-		}
-		rev, _ := revisions[0].(map[string]any)
-		status, _ := rev["status"].(string)
-		if onStatus != nil {
-			onStatus(status)
-		}
-		if TerminalStatuses[status] {
-			return status, nil
-		}
-		time.Sleep(interval)
-	}
-	return "", fmt.Errorf("deployment timed out after %d seconds", timeoutSeconds)
-}
-
-// SecretsFromEnv converts an env var map into a Secret slice, filtering out
-// reserved variable names and empty values.
-func SecretsFromEnv(envVars map[string]string) []Secret {
-	var secrets []Secret
-	for name, value := range envVars {
-		if reservedEnvVars[name] {
-			continue
-		}
-		if value == "" {
-			continue
-		}
-		secrets = append(secrets, Secret{Name: name, Value: value})
-	}
-	return secrets
-}

libs/cli/internal/deploy/helpers_test.go

@@ -1,154 +0,0 @@
-package deploy
-
-import (
-	"os"
-	"sort"
-	"testing"
-)
-
-func TestNormalizeImageName(t *testing.T) {
-	tests := []struct {
-		input string
-		want  string
-	}{
-		{"MyApp", "myapp"},
-		{"", "app"},
-		{"!!!", "app"},
-		{"my-app", "my-app"},
-		{"My Cool App", "my-cool-app"},
-		{"..leading-dots", "leading-dots"},
-		{"trailing-dots..", "trailing-dots"},
-		{"hello_world.v2", "hello_world.v2"},
-	}
-	for _, tc := range tests {
-		t.Run(tc.input, func(t *testing.T) {
-			got := NormalizeImageName(tc.input)
-			if got != tc.want {
-				t.Errorf("NormalizeImageName(%q) = %q, want %q", tc.input, got, tc.want)
-			}
-		})
-	}
-}
-
-func TestNormalizeImageTag(t *testing.T) {
-	tests := []struct {
-		input   string
-		want    string
-		wantErr bool
-	}{
-		{"v1.2.3", "v1.2.3", false},
-		{"", "latest", false},
-		{"has space", "", true},
-		{"valid_tag-1.0", "valid_tag-1.0", false},
-		{"tag/slash", "", true},
-	}
-	for _, tc := range tests {
-		t.Run(tc.input, func(t *testing.T) {
-			got, err := NormalizeImageTag(tc.input)
-			if tc.wantErr {
-				if err == nil {
-					t.Errorf("NormalizeImageTag(%q) expected error, got nil", tc.input)
-				}
-				return
-			}
-			if err != nil {
-				t.Errorf("NormalizeImageTag(%q) unexpected error: %v", tc.input, err)
-				return
-			}
-			if got != tc.want {
-				t.Errorf("NormalizeImageTag(%q) = %q, want %q", tc.input, got, tc.want)
-			}
-		})
-	}
-}
-
-func TestValidateDeploymentSelector(t *testing.T) {
-	tests := []struct {
-		name         string
-		deploymentID string
-		depName      string
-		wantErr      bool
-	}{
-		{"both empty", "", "", true},
-		{"id set", "abc-123", "", false},
-		{"name set", "", "my-deploy", false},
-		{"both set", "abc-123", "my-deploy", false},
-	}
-	for _, tc := range tests {
-		t.Run(tc.name, func(t *testing.T) {
-			err := ValidateDeploymentSelector(tc.deploymentID, tc.depName)
-			if tc.wantErr && err == nil {
-				t.Error("expected error, got nil")
-			}
-			if !tc.wantErr && err != nil {
-				t.Errorf("unexpected error: %v", err)
-			}
-		})
-	}
-}
-
-func TestSecretsFromEnv(t *testing.T) {
-	envVars := map[string]string{
-		"MY_SECRET":         "value1",
-		"ANOTHER_SECRET":    "value2",
-		"LANGCHAIN_API_KEY": "should-be-filtered",
-		"POSTGRES_URI":      "should-be-filtered",
-		"EMPTY_VAR":         "",
-	}
-
-	secrets := SecretsFromEnv(envVars)
-
-	// Sort for deterministic comparison
-	sort.Slice(secrets, func(i, j int) bool {
-		return secrets[i].Name < secrets[j].Name
-	})
-
-	if len(secrets) != 2 {
-		t.Fatalf("expected 2 secrets, got %d: %+v", len(secrets), secrets)
-	}
-
-	if secrets[0].Name != "ANOTHER_SECRET" || secrets[0].Value != "value2" {
-		t.Errorf("unexpected secret[0]: %+v", secrets[0])
-	}
-	if secrets[1].Name != "MY_SECRET" || secrets[1].Value != "value1" {
-		t.Errorf("unexpected secret[1]: %+v", secrets[1])
-	}
-}
-
-func TestResolveAPIKey(t *testing.T) {
-	// Flag value takes precedence
-	got := ResolveAPIKey("flag-key", map[string]string{"LANGSMITH_API_KEY": "env-key"})
-	if got != "flag-key" {
-		t.Errorf("expected flag-key, got %q", got)
-	}
-
-	// envVars map is checked next
-	got = ResolveAPIKey("", map[string]string{"LANGSMITH_API_KEY": "env-key"})
-	if got != "env-key" {
-		t.Errorf("expected env-key, got %q", got)
-	}
-
-	// os.Getenv fallback
-	os.Setenv("LANGSMITH_API_KEY", "os-env-key")
-	defer os.Unsetenv("LANGSMITH_API_KEY")
-
-	got = ResolveAPIKey("", nil)
-	if got != "os-env-key" {
-		t.Errorf("expected os-env-key, got %q", got)
-	}
-
-	// Flag still takes precedence over os env
-	got = ResolveAPIKey("flag-value", nil)
-	if got != "flag-value" {
-		t.Errorf("expected flag-value, got %q", got)
-	}
-
-	// Empty everything returns empty
-	os.Unsetenv("LANGSMITH_API_KEY")
-	os.Unsetenv("LANGGRAPH_HOST_API_KEY")
-	os.Unsetenv("LANGCHAIN_API_KEY")
-	got = ResolveAPIKey("", nil)
-	if got != "" {
-		t.Errorf("expected empty string, got %q", got)
-	}
-}

libs/cli/internal/docker/docker.go

@@ -1,529 +0,0 @@
-// Package docker provides Docker compose generation, capability detection,
-// and image building for the LangGraph CLI.
-package docker
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"os"
-	"os/exec"
-	"runtime"
-	"strconv"
-	"strings"
-	"time"
-
-	"github.com/langchain-ai/langgraph/libs/cli/internal/config"
-)
-
-// DefaultPostgresURI is the default connection string used when no custom
-// Postgres URI is provided.
-const DefaultPostgresURI = "postgres://postgres:postgres@langgraph-postgres:5432/postgres?sslmode=disable"
-
-// Version represents a semantic version with major, minor, and patch components.
-type Version struct {
-	Major, Minor, Patch int
-}
-
-// GreaterOrEqual returns true if v >= other.
-func (v Version) GreaterOrEqual(other Version) bool {
-	if v.Major != other.Major {
-		return v.Major > other.Major
-	}
-	if v.Minor != other.Minor {
-		return v.Minor > other.Minor
-	}
-	return v.Patch >= other.Patch
-}
-
-// DockerCapabilities describes the Docker environment available on the host.
-type DockerCapabilities struct {
-	VersionDocker            Version
-	VersionCompose           Version
-	HealthcheckStartInterval bool
-	ComposeType              string // "plugin" or "standalone"
-}
-
-// ComposeOpts configures the generated docker-compose YAML.
-type ComposeOpts struct {
-	Port              int
-	DebuggerPort      int    // 0 means no debugger
-	DebuggerBaseURL   string // optional base URL for the debugger
-	PostgresURI       string // empty means use DefaultPostgresURI
-	Image             string // pre-built image name
-	BaseImage         string
-	APIVersion        string
-	EngineRuntimeMode string // "combined_queue_worker" or "distributed"
-}
-
-// BuildImageOpts configures docker image building.
-type BuildImageOpts struct {
-	ConfigPath     string
-	ConfigJSON     map[string]any
-	BaseImage      string
-	APIVersion     string
-	Pull           bool
-	Tag            string
-	Passthrough    []string
-	InstallCommand string
-	BuildCommand   string
-	DockerCommand  []string // default: ["docker", "build"]
-	ExtraFlags     []string
-	Verbose        bool
-}
-
-// OrderedMap preserves insertion order for map keys.
-type OrderedMap struct {
-	Keys   []string
-	Values map[string]any
-}
-
-// NewOrderedMap creates an empty OrderedMap.
-func NewOrderedMap() *OrderedMap {
-	return &OrderedMap{
-		Values: make(map[string]any),
-	}
-}
-
-// Set adds or updates a key-value pair, preserving insertion order.
-func (om *OrderedMap) Set(key string, value any) {
-	if _, exists := om.Values[key]; !exists {
-		om.Keys = append(om.Keys, key)
-	}
-	om.Values[key] = value
-}
-
-// Get retrieves the value for a key.
-func (om *OrderedMap) Get(key string) (any, bool) {
-	v, ok := om.Values[key]
-	return v, ok
-}
-
-// ---------------------------------------------------------------------------
-// ParseVersion
-// ---------------------------------------------------------------------------
-
-// ParseVersion parses a version string like "1.2.3", "v1.2.3-alpha+build",
-// "1.2", or "1" into a Version.
-func ParseVersion(version string) Version {
-	parts := strings.SplitN(version, ".", 3)
-
-	major := "0"
-	minor := "0"
-	patch := "0"
-
-	switch len(parts) {
-	case 1:
-		major = parts[0]
-	case 2:
-		major = parts[0]
-		minor = parts[1]
-	default:
-		major = parts[0]
-		minor = parts[1]
-		patch = parts[2]
-	}
-
-	// Strip "v" prefix from major
-	major = strings.TrimPrefix(major, "v")
-
-	// Strip "-" and "+" suffixes from patch
-	if idx := strings.IndexAny(patch, "-+"); idx >= 0 {
-		patch = patch[:idx]
-	}
-
-	majorInt, _ := strconv.Atoi(major)
-	minorInt, _ := strconv.Atoi(minor)
-	patchInt, _ := strconv.Atoi(patch)
-
-	return Version{Major: majorInt, Minor: minorInt, Patch: patchInt}
-}
-
-// ---------------------------------------------------------------------------
-// CanBuildLocally
-// ---------------------------------------------------------------------------
-
-// CanBuildLocally checks whether local deployment builds can run on this machine.
-// It returns (ok, errorMessage). If ok is true, errorMessage is empty.
-func CanBuildLocally() (bool, string) {
-	if _, err := exec.LookPath("docker"); err != nil {
-		return false, "Docker is required but not installed.\n" +
-			"Install Docker Desktop: https://docs.docker.com/get-docker/"
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	cmd := exec.CommandContext(ctx, "docker", "info")
-	cmd.Stdout = nil
-	cmd.Stderr = nil
-	if err := cmd.Run(); err != nil {
-		return false, "Docker is installed but not running.\nStart Docker and try again."
-	}
-
-	if runtime.GOARCH != "amd64" {
-		ctx2, cancel2 := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel2()
-
-		buildx := exec.CommandContext(ctx2, "docker", "buildx", "version")
-		buildx.Stdout = nil
-		buildx.Stderr = nil
-		if err := buildx.Run(); err != nil {
-			arch := runtime.GOARCH
-			// Try to match Python's platform.machine() naming for the error message
-			if arch == "arm64" {
-				arch = "aarch64"
-			}
-			return false, "Docker Buildx is required but not installed.\n" +
-				"Your machine architecture (" + arch + ") requires Buildx to cross-compile images for linux/amd64.\n" +
-				"Install Buildx: https://docs.docker.com/build/install-buildx/"
-		}
-	}
-	return true, ""
-}
-
-// ---------------------------------------------------------------------------
-// CheckCapabilities
-// ---------------------------------------------------------------------------
-
-// CheckCapabilities detects the Docker and Docker Compose versions available
-// on the host and returns a DockerCapabilities describing them.
-func CheckCapabilities() (*DockerCapabilities, error) {
-	if _, err := exec.LookPath("docker"); err != nil {
-		return nil, fmt.Errorf("Docker not installed")
-	}
-
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	out, err := exec.CommandContext(ctx, "docker", "info", "-f", "{{json .}}").Output()
-	if err != nil {
-		return nil, fmt.Errorf("Docker not installed or not running")
-	}
-
-	var info map[string]any
-	if err := json.Unmarshal(out, &info); err != nil {
-		return nil, fmt.Errorf("Docker not installed or not running")
-	}
-
-	serverVersion, _ := info["ServerVersion"].(string)
-	if serverVersion == "" {
-		return nil, fmt.Errorf("Docker not running")
-	}
-
-	// Try to find compose plugin
-	var composeVersionStr string
-	composeType := "plugin"
-
-	found := false
-	if clientInfo, ok := info["ClientInfo"].(map[string]any); ok {
-		if plugins, ok := clientInfo["Plugins"].([]any); ok {
-			for _, p := range plugins {
-				pm, ok := p.(map[string]any)
-				if !ok {
-					continue
-				}
-				name, _ := pm["Name"].(string)
-				if name == "compose" {
-					composeVersionStr, _ = pm["Version"].(string)
-					found = true
-					break
-				}
-			}
-		}
-	}
-
-	if !found {
-		// Fall back to standalone docker-compose
-		if _, err := exec.LookPath("docker-compose"); err != nil {
-			return nil, fmt.Errorf("Docker Compose not installed")
-		}
-
-		ctx2, cancel2 := context.WithTimeout(context.Background(), 10*time.Second)
-		defer cancel2()
-
-		out2, err := exec.CommandContext(ctx2, "docker-compose", "--version", "--short").Output()
-		if err != nil {
-			return nil, fmt.Errorf("Docker Compose not installed")
-		}
-		composeVersionStr = strings.TrimSpace(string(out2))
-		composeType = "standalone"
-	}
-
-	dockerVersion := ParseVersion(serverVersion)
-	composeVersion := ParseVersion(composeVersionStr)
-
-	return &DockerCapabilities{
-		VersionDocker:            dockerVersion,
-		VersionCompose:           composeVersion,
-		HealthcheckStartInterval: dockerVersion.GreaterOrEqual(Version{25, 0, 0}),
-		ComposeType:              composeType,
-	}, nil
-}
-
-// ---------------------------------------------------------------------------
-// DebuggerCompose
-// ---------------------------------------------------------------------------
-
-// DebuggerCompose returns a service config map for the langgraph-debugger
-// container, or nil if port is 0 (no debugger requested).
-func DebuggerCompose(port int, baseURL string) *OrderedMap {
-	if port == 0 {
-		return nil
-	}
-
-	dependsOn := NewOrderedMap()
-	postgresCondition := NewOrderedMap()
-	postgresCondition.Set("condition", "service_healthy")
-	dependsOn.Set("langgraph-postgres", postgresCondition)
-
-	service := NewOrderedMap()
-	service.Set("image", "langchain/langgraph-debugger")
-	service.Set("restart", "on-failure")
-	service.Set("depends_on", dependsOn)
-	service.Set("ports", []any{fmt.Sprintf(`"%d:3968"`, port)})
-
-	if baseURL != "" {
-		env := NewOrderedMap()
-		env.Set("VITE_STUDIO_LOCAL_GRAPH_URL", baseURL)
-		service.Set("environment", env)
-	}
-
-	result := NewOrderedMap()
-	result.Set("langgraph-debugger", service)
-	return result
-}
-
-// ---------------------------------------------------------------------------
-// DictToYAML
-// ---------------------------------------------------------------------------
-
-// DictToYAML converts an OrderedMap to a YAML string. For top-level keys
-// (indent < 2) it adds a blank line between entries (except the first).
-func DictToYAML(d *OrderedMap, indent int) string {
-	var b strings.Builder
-	for idx, key := range d.Keys {
-		// Add blank line between top-level entries (except first)
-		if idx >= 1 && indent < 2 {
-			b.WriteString("\n")
-		}
-
-		space := strings.Repeat("    ", indent)
-		value := d.Values[key]
-
-		switch v := value.(type) {
-		case *OrderedMap:
-			b.WriteString(fmt.Sprintf("%s%s:\n", space, key))
-			b.WriteString(DictToYAML(v, indent+1))
-		case []any:
-			b.WriteString(fmt.Sprintf("%s%s:\n", space, key))
-			for _, item := range v {
-				b.WriteString(fmt.Sprintf("%s    - %v\n", space, item))
-			}
-		default:
-			b.WriteString(fmt.Sprintf("%s%s: %v\n", space, key, value))
-		}
-	}
-	return b.String()
-}
-
-// ---------------------------------------------------------------------------
-// ComposeAsDict
-// ---------------------------------------------------------------------------
-
-// ComposeAsDict builds the docker-compose configuration as an OrderedMap.
-func ComposeAsDict(caps *DockerCapabilities, opts ComposeOpts) *OrderedMap {
-	postgresURI := opts.PostgresURI
-	includeDB := false
-	if postgresURI == "" {
-		includeDB = true
-		postgresURI = DefaultPostgresURI
-	}
-
-	services := NewOrderedMap()
-
-	// --- Redis service ---
-	redisHealthcheck := NewOrderedMap()
-	redisHealthcheck.Set("test", "redis-cli ping")
-	redisHealthcheck.Set("interval", "5s")
-	redisHealthcheck.Set("timeout", "1s")
-	redisHealthcheck.Set("retries", 5)
-
-	redisService := NewOrderedMap()
-	redisService.Set("image", "redis:6")
-	redisService.Set("healthcheck", redisHealthcheck)
-	services.Set("langgraph-redis", redisService)
-
-	// --- Postgres service (if no custom URI) ---
-	if includeDB {
-		pgEnv := NewOrderedMap()
-		pgEnv.Set("POSTGRES_DB", "postgres")
-		pgEnv.Set("POSTGRES_USER", "postgres")
-		pgEnv.Set("POSTGRES_PASSWORD", "postgres")
-
-		pgHealthcheck := NewOrderedMap()
-		pgHealthcheck.Set("test", "pg_isready -U postgres")
-		pgHealthcheck.Set("start_period", "10s")
-		pgHealthcheck.Set("timeout", "1s")
-		pgHealthcheck.Set("retries", 5)
-
-		if caps.HealthcheckStartInterval {
-			pgHealthcheck.Set("interval", "60s")
-			pgHealthcheck.Set("start_interval", "1s")
-		} else {
-			pgHealthcheck.Set("interval", "5s")
-		}
-
-		pgService := NewOrderedMap()
-		pgService.Set("image", "pgvector/pgvector:pg16")
-		pgService.Set("ports", []any{`"5433:5432"`})
-		pgService.Set("environment", pgEnv)
-		pgService.Set("command", []any{"postgres", "-c", "shared_preload_libraries=vector"})
-		pgService.Set("volumes", []any{"langgraph-data:/var/lib/postgresql/data"})
-		pgService.Set("healthcheck", pgHealthcheck)
-
-		services.Set("langgraph-postgres", pgService)
-	}
-
-	// --- Debugger service (optional) ---
-	if opts.DebuggerPort != 0 {
-		debuggerMap := DebuggerCompose(opts.DebuggerPort, opts.DebuggerBaseURL)
-		if debuggerMap != nil {
-			debuggerService, _ := debuggerMap.Get("langgraph-debugger")
-			services.Set("langgraph-debugger", debuggerService)
-		}
-	}
-
-	// --- langgraph-api service ---
-	apiEnv := NewOrderedMap()
-	apiEnv.Set("REDIS_URI", "redis://langgraph-redis:6379")
-	apiEnv.Set("POSTGRES_URI", postgresURI)
-
-	if opts.EngineRuntimeMode == "distributed" {
-		apiEnv.Set("N_JOBS_PER_WORKER", `"0"`)
-	}
-
-	apiDependsOn := NewOrderedMap()
-	redisCondition := NewOrderedMap()
-	redisCondition.Set("condition", "service_healthy")
-	apiDependsOn.Set("langgraph-redis", redisCondition)
-
-	if includeDB {
-		pgCondition := NewOrderedMap()
-		pgCondition.Set("condition", "service_healthy")
-		apiDependsOn.Set("langgraph-postgres", pgCondition)
-	}
-
-	apiService := NewOrderedMap()
-	apiService.Set("ports", []any{fmt.Sprintf(`"%d:8000"`, opts.Port)})
-	apiService.Set("depends_on", apiDependsOn)
-	apiService.Set("environment", apiEnv)
-
-	if opts.Image != "" {
-		apiService.Set("image", opts.Image)
-	}
-
-	if caps.HealthcheckStartInterval {
-		apiHealthcheck := NewOrderedMap()
-		apiHealthcheck.Set("test", "python /api/healthcheck.py")
-		apiHealthcheck.Set("interval", "60s")
-		apiHealthcheck.Set("start_interval", "1s")
-		apiHealthcheck.Set("start_period", "10s")
-		apiService.Set("healthcheck", apiHealthcheck)
-	}
-
-	services.Set("langgraph-api", apiService)
-
-	// --- Build final compose dict ---
-	composeDict := NewOrderedMap()
-	if includeDB {
-		volumes := NewOrderedMap()
-		volumeDriver := NewOrderedMap()
-		volumeDriver.Set("driver", "local")
-		volumes.Set("langgraph-data", volumeDriver)
-		composeDict.Set("volumes", volumes)
-	}
-	composeDict.Set("services", services)
-
-	return composeDict
-}
-
-// ---------------------------------------------------------------------------
-// Compose
-// ---------------------------------------------------------------------------
-
-// Compose generates a docker-compose YAML string from the given capabilities
-// and options.
-func Compose(caps *DockerCapabilities, opts ComposeOpts) string {
-	d := ComposeAsDict(caps, opts)
-	return DictToYAML(d, 0)
-}
-
-// ---------------------------------------------------------------------------
-// BuildDockerImage
-// ---------------------------------------------------------------------------
-
-// BuildDockerImage builds a Docker image from a LangGraph configuration.
-// It shells out to docker build (or a custom docker command) with the
-// generated Dockerfile piped via stdin.
-func BuildDockerImage(opts BuildImageOpts) error {
-	dockerCmd := opts.DockerCommand
-	if len(dockerCmd) == 0 {
-		dockerCmd = []string{"docker", "build"}
-	}
-
-	// Pull the base image first if requested.
-	if opts.Pull {
-		pullCmd := exec.Command("docker", "pull", opts.Tag)
-		pullCmd.Stdout = os.Stdout
-		pullCmd.Stderr = os.Stderr
-		if err := pullCmd.Run(); err != nil {
-			return fmt.Errorf("failed to pull image %s: %w", opts.Tag, err)
-		}
-	}
-
-	// Build the docker build arguments.
-	args := []string{
-		"-f", "-", // read Dockerfile from stdin
-		"-t", opts.Tag,
-	}
-
-	// Determine build context.
-	buildContext := "."
-	if opts.ConfigPath != "" {
-		// Use the parent directory of the config file by default.
-		idx := strings.LastIndex(opts.ConfigPath, "/")
-		if idx >= 0 {
-			buildContext = opts.ConfigPath[:idx]
-		}
-	}
-
-	// Generate the Dockerfile using the real config.ConfigToDocker.
-	dockerfile, additionalContexts, err := config.ConfigToDocker(opts.ConfigPath, opts.ConfigJSON, config.DockerOpts{
-		BaseImage:      opts.BaseImage,
-		APIVersion:     opts.APIVersion,
-		InstallCommand: opts.InstallCommand,
-		BuildCommand:   opts.BuildCommand,
-	})
-	if err != nil {
-		return fmt.Errorf("generating Dockerfile: %w", err)
-	}
-
-	// Add additional build contexts (for dependencies outside the main context).
-	for name, path := range additionalContexts {
-		args = append(args, "--build-context", fmt.Sprintf("%s=%s", name, path))
-	}
-
-	// Assemble the full command.
-	fullArgs := append(dockerCmd[1:], args...)
-	fullArgs = append(fullArgs, opts.ExtraFlags...)
-	fullArgs = append(fullArgs, opts.Passthrough...)
-	fullArgs = append(fullArgs, buildContext)
-
-	cmd := exec.Command(dockerCmd[0], fullArgs...)
-	cmd.Stdin = strings.NewReader(dockerfile)
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-
-	return cmd.Run()
-}

libs/cli/internal/docker/docker_test.go

@@ -1,290 +0,0 @@
-package docker
-
-import (
-	"fmt"
-	"strings"
-	"testing"
-)
-
-func cleanEmptyLines(s string) string {
-	lines := strings.Split(s, "\n")
-	var result []string
-	for _, line := range lines {
-		if strings.TrimSpace(line) != "" {
-			result = append(result, line)
-		}
-	}
-	return strings.Join(result, "\n")
-}
-
-var defaultCaps = &DockerCapabilities{
-	VersionDocker:            Version{Major: 26, Minor: 1, Patch: 1},
-	VersionCompose:           Version{Major: 2, Minor: 27, Patch: 0},
-	HealthcheckStartInterval: false,
-}
-
-func TestComposeCustomDBNoDebugger(t *testing.T) {
-	port := 8123
-	actual := Compose(defaultCaps, ComposeOpts{
-		Port:        port,
-		PostgresURI: "custom_postgres_uri",
-	})
-	expected := fmt.Sprintf(`services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-api:
-        ports:
-            - "%d:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: custom_postgres_uri`, port)
-
-	if cleanEmptyLines(actual) != expected {
-		t.Errorf("mismatch.\nExpected:\n%s\n\nGot:\n%s", expected, cleanEmptyLines(actual))
-	}
-}
-
-func TestComposeCustomDBWithHealthcheck(t *testing.T) {
-	port := 8123
-	capsHC := &DockerCapabilities{
-		VersionDocker:            Version{Major: 26, Minor: 1, Patch: 1},
-		VersionCompose:           Version{Major: 2, Minor: 27, Patch: 0},
-		HealthcheckStartInterval: true,
-	}
-	actual := Compose(capsHC, ComposeOpts{
-		Port:        port,
-		PostgresURI: "custom_postgres_uri",
-	})
-	expected := fmt.Sprintf(`services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-api:
-        ports:
-            - "%d:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: custom_postgres_uri
-        healthcheck:
-            test: python /api/healthcheck.py
-            interval: 60s
-            start_interval: 1s
-            start_period: 10s`, port)
-
-	if cleanEmptyLines(actual) != expected {
-		t.Errorf("mismatch.\nExpected:\n%s\n\nGot:\n%s", expected, cleanEmptyLines(actual))
-	}
-}
-
-func TestComposeDefaultDB(t *testing.T) {
-	port := 8123
-	actual := Compose(defaultCaps, ComposeOpts{Port: port})
-	expected := fmt.Sprintf(`volumes:
-    langgraph-data:
-        driver: local
-services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-postgres:
-        image: pgvector/pgvector:pg16
-        ports:
-            - "5433:5432"
-        environment:
-            POSTGRES_DB: postgres
-            POSTGRES_USER: postgres
-            POSTGRES_PASSWORD: postgres
-        command:
-            - postgres
-            - -c
-            - shared_preload_libraries=vector
-        volumes:
-            - langgraph-data:/var/lib/postgresql/data
-        healthcheck:
-            test: pg_isready -U postgres
-            start_period: 10s
-            timeout: 1s
-            retries: 5
-            interval: 5s
-    langgraph-api:
-        ports:
-            - "%d:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-            langgraph-postgres:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: %s`, port, DefaultPostgresURI)
-
-	if cleanEmptyLines(actual) != expected {
-		t.Errorf("mismatch.\nExpected:\n%s\n\nGot:\n%s", expected, cleanEmptyLines(actual))
-	}
-}
-
-func TestComposeDistributedMode(t *testing.T) {
-	port := 8123
-	actual := Compose(defaultCaps, ComposeOpts{
-		Port:              port,
-		PostgresURI:       "custom_postgres_uri",
-		EngineRuntimeMode: "distributed",
-	})
-	expected := fmt.Sprintf(`services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-api:
-        ports:
-            - "%d:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: custom_postgres_uri
-            N_JOBS_PER_WORKER: "0"`, port)
-
-	if cleanEmptyLines(actual) != expected {
-		t.Errorf("mismatch.\nExpected:\n%s\n\nGot:\n%s", expected, cleanEmptyLines(actual))
-	}
-}
-
-func TestComposeCombinedModeNoNJobs(t *testing.T) {
-	actual := Compose(defaultCaps, ComposeOpts{
-		Port:              8123,
-		EngineRuntimeMode: "combined_queue_worker",
-	})
-	if strings.Contains(actual, "N_JOBS_PER_WORKER") {
-		t.Error("combined mode should not contain N_JOBS_PER_WORKER")
-	}
-}
-
-func TestComposeDebuggerDefaultDB(t *testing.T) {
-	port := 8123
-	debuggerPort := 8001
-	actual := Compose(defaultCaps, ComposeOpts{
-		Port:         port,
-		DebuggerPort: debuggerPort,
-	})
-	expected := fmt.Sprintf(`volumes:
-    langgraph-data:
-        driver: local
-services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-postgres:
-        image: pgvector/pgvector:pg16
-        ports:
-            - "5433:5432"
-        environment:
-            POSTGRES_DB: postgres
-            POSTGRES_USER: postgres
-            POSTGRES_PASSWORD: postgres
-        command:
-            - postgres
-            - -c
-            - shared_preload_libraries=vector
-        volumes:
-            - langgraph-data:/var/lib/postgresql/data
-        healthcheck:
-            test: pg_isready -U postgres
-            start_period: 10s
-            timeout: 1s
-            retries: 5
-            interval: 5s
-    langgraph-debugger:
-        image: langchain/langgraph-debugger
-        restart: on-failure
-        depends_on:
-            langgraph-postgres:
-                condition: service_healthy
-        ports:
-            - "%d:3968"
-    langgraph-api:
-        ports:
-            - "%d:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-            langgraph-postgres:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: %s`, debuggerPort, port, DefaultPostgresURI)
-
-	if cleanEmptyLines(actual) != expected {
-		t.Errorf("mismatch.\nExpected:\n%s\n\nGot:\n%s", expected, cleanEmptyLines(actual))
-	}
-}
-
-func TestParseVersion(t *testing.T) {
-	tests := []struct {
-		input    string
-		expected Version
-	}{
-		{"1.2.3", Version{1, 2, 3}},
-		{"v1.2.3", Version{1, 2, 3}},
-		{"1.2.3-alpha", Version{1, 2, 3}},
-		{"1.2.3+1", Version{1, 2, 3}},
-		{"1.2.3-alpha+build", Version{1, 2, 3}},
-		{"1.2", Version{1, 2, 0}},
-		{"1", Version{1, 0, 0}},
-		{"v28.1.1+1", Version{28, 1, 1}},
-		{"2.0.0-beta.1+exp.sha.5114f85", Version{2, 0, 0}},
-		{"v3.4.5-rc1+build.123", Version{3, 4, 5}},
-	}
-
-	for _, tc := range tests {
-		result := ParseVersion(tc.input)
-		if result != tc.expected {
-			t.Errorf("ParseVersion(%q) = %v, want %v", tc.input, result, tc.expected)
-		}
-	}
-}
-
-func TestVersionGreaterOrEqual(t *testing.T) {
-	tests := []struct {
-		v, other Version
-		want     bool
-	}{
-		{Version{25, 0, 0}, Version{25, 0, 0}, true},
-		{Version{26, 1, 1}, Version{25, 0, 0}, true},
-		{Version{24, 9, 9}, Version{25, 0, 0}, false},
-	}
-
-	for _, tc := range tests {
-		got := tc.v.GreaterOrEqual(tc.other)
-		if got != tc.want {
-			t.Errorf("%v.GreaterOrEqual(%v) = %v, want %v", tc.v, tc.other, got, tc.want)
-		}
-	}
-}

libs/cli/internal/exec/exec.go

@@ -1,123 +0,0 @@
-// Package lgexec provides subprocess execution helpers for the LangGraph CLI.
-//
-// The package name is lgexec (rather than exec) to avoid shadowing the
-// standard library os/exec package.
-package lgexec
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-	"io"
-	"os"
-	"os/exec"
-	"strings"
-)
-
-// RunOpts configures how a subprocess is executed.
-type RunOpts struct {
-	Stdin   string   // input to pass via stdin
-	Verbose bool     // pipe stdout/stderr to os.Stdout/os.Stderr
-	Dir     string   // working directory
-	Env     []string // environment variables (KEY=VALUE)
-}
-
-// Run executes the named program with the given arguments.
-//
-// When Verbose is true stdout and stderr are forwarded to the process's
-// os.Stdout / os.Stderr.  Otherwise output is silently discarded.
-// A non-zero exit code is returned as an *ExitError.
-func Run(name string, args []string, opts RunOpts) error {
-	cmd := exec.Command(name, args...)
-
-	if opts.Dir != "" {
-		cmd.Dir = opts.Dir
-	}
-	if len(opts.Env) > 0 {
-		cmd.Env = append(os.Environ(), opts.Env...)
-	}
-
-	if opts.Stdin != "" {
-		cmd.Stdin = strings.NewReader(opts.Stdin)
-	}
-
-	if opts.Verbose {
-		if opts.Stdin != "" {
-			cmdStr := fmt.Sprintf("+ %s %s", name, strings.Join(args, " "))
-			fmt.Printf("%s <\n%s\n", cmdStr, strings.Join(
-				nonEmptyLines(opts.Stdin), "\n"))
-		} else {
-			fmt.Printf("+ %s %s\n", name, strings.Join(args, " "))
-		}
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-	} else {
-		cmd.Stdout = io.Discard
-		cmd.Stderr = io.Discard
-	}
-
-	return cmd.Run()
-}
-
-// RunCollect executes the named program and collects stdout and stderr.
-// Both are returned as strings. A non-zero exit code results in a non-nil error.
-func RunCollect(name string, args []string) (stdout, stderr string, err error) {
-	cmd := exec.Command(name, args...)
-
-	var outBuf, errBuf bytes.Buffer
-	cmd.Stdout = &outBuf
-	cmd.Stderr = &errBuf
-
-	err = cmd.Run()
-	return outBuf.String(), errBuf.String(), err
-}
-
-// RunWithCallback executes the named program and invokes onStdout for each
-// line of stdout output.  If onStdout returns true the callback is no longer
-// called and remaining stdout is forwarded directly to os.Stdout (matching
-// the Python CLI's monitor_stream behaviour).
-// Stderr is always forwarded to os.Stderr.
-func RunWithCallback(name string, args []string, onStdout func(string) bool) error {
-	cmd := exec.Command(name, args...)
-	cmd.Stderr = os.Stderr
-
-	pipe, err := cmd.StdoutPipe()
-	if err != nil {
-		return fmt.Errorf("cannot create stdout pipe: %w", err)
-	}
-
-	if err := cmd.Start(); err != nil {
-		return fmt.Errorf("cannot start command: %w", err)
-	}
-
-	scanner := bufio.NewScanner(pipe)
-	stopped := false
-	for scanner.Scan() {
-		line := scanner.Text()
-		if stopped {
-			// After callback signalled stop, forward remaining output.
-			fmt.Fprintln(os.Stdout, line)
-			continue
-		}
-		if onStdout(line) {
-			stopped = true
-		}
-	}
-	if scanErr := scanner.Err(); scanErr != nil {
-		// Drain but ignore read errors on stdout — the exit code matters.
-		_ = scanErr
-	}
-
-	return cmd.Wait()
-}
-
-// nonEmptyLines splits s on newlines and returns lines that are not empty.
-func nonEmptyLines(s string) []string {
-	var out []string
-	for _, line := range strings.Split(s, "\n") {
-		if line != "" {
-			out = append(out, line)
-		}
-	}
-	return out
-}

libs/cli/internal/root/root_test.go

@@ -1,287 +0,0 @@
-package root
-
-import (
-	"bytes"
-	"io"
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-)
-
-func TestRunHelp(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	exitCode := Run(nil, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d", exitCode)
-	}
-	if stderr.Len() != 0 {
-		t.Fatalf("expected no stderr output, got %q", stderr.String())
-	}
-	if !strings.Contains(stdout.String(), "validate") {
-		t.Fatalf("expected help text to contain 'validate', got %q", stdout.String())
-	}
-}
-
-func TestRunVersion(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	exitCode := Run([]string{"version"}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d", exitCode)
-	}
-	if stderr.Len() != 0 {
-		t.Fatalf("expected no stderr output, got %q", stderr.String())
-	}
-	if !strings.Contains(stdout.String(), "langgraph") {
-		t.Fatalf("unexpected stdout: %q", stdout.String())
-	}
-}
-
-func TestRunUnknownCommand(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	exitCode := Run([]string{"nonexistent-cmd"}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "is not a langgraph command") {
-		t.Fatalf("unexpected stderr: %q", stderr.String())
-	}
-}
-
-func writeTempConfig(t *testing.T, content string) string {
-	t.Helper()
-	dir := t.TempDir()
-	path := filepath.Join(dir, "langgraph.json")
-	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
-		t.Fatalf("failed to write temp config: %v", err)
-	}
-	return path
-}
-
-func TestRunValidateWithValidConfig(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{"dependencies": ["langchain"], "graphs": {"agent": "./agent.py:graph"}}`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d; stderr: %q", exitCode, stderr.String())
-	}
-	if !strings.Contains(stdout.String(), "is valid") {
-		t.Fatalf("expected stdout to contain 'is valid', got %q", stdout.String())
-	}
-	if !strings.Contains(stdout.String(), "1 graph") {
-		t.Fatalf("expected stdout to contain '1 graph', got %q", stdout.String())
-	}
-}
-
-func TestRunValidateWithInvalidConfig(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{"graphs": {}}`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "No graphs found") {
-		t.Fatalf("expected stderr to contain 'No graphs found', got %q", stderr.String())
-	}
-}
-
-func TestRunValidateWithInvalidJSON(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{invalid json`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "Invalid JSON") {
-		t.Fatalf("expected stderr to contain 'Invalid JSON', got %q", stderr.String())
-	}
-}
-
-func TestRunValidateWithNonObjectJSON(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `[]`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "top-level JSON value must be an object") {
-		t.Fatalf("expected stderr to mention object-shaped config, got %q", stderr.String())
-	}
-}
-
-func TestRunValidateDefaultConfigMissing(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	// Use a path that definitely does not exist.
-	nonexistent := filepath.Join(t.TempDir(), "langgraph.json")
-
-	exitCode := Run([]string{"validate", "-c", nonexistent}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "does not exist") {
-		t.Fatalf("expected stderr to contain 'does not exist', got %q", stderr.String())
-	}
-}
-
-func TestRunValidateWithUnknownKeys(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{"dependencies": ["langchain"], "graphs": {"agent": "./agent.py:graph"}, "grpahs": {}}`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d; stderr: %q", exitCode, stderr.String())
-	}
-	out := stdout.String()
-	if !strings.Contains(strings.ToLower(out), "warning") {
-		t.Fatalf("expected stdout to contain 'warning', got %q", out)
-	}
-	if !strings.Contains(strings.ToLower(out), "did you mean") {
-		t.Fatalf("expected stdout to contain 'did you mean', got %q", out)
-	}
-}
-
-func TestRunValidateHelp(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	exitCode := Run([]string{"validate", "--help"}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d", exitCode)
-	}
-	if !strings.Contains(stdout.String(), "Validate the LangGraph configuration file") {
-		t.Fatalf("expected stdout to contain validate help text, got %q", stdout.String())
-	}
-}
-
-func TestRunValidateMultipleGraphs(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{"dependencies": ["langchain"], "graphs": {"agent": "./a.py:g", "bot": "./b.py:g"}}`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d; stderr: %q", exitCode, stderr.String())
-	}
-	if !strings.Contains(stdout.String(), "2 graphs found") {
-		t.Fatalf("expected stdout to contain '2 graphs found', got %q", stdout.String())
-	}
-}
-
-func TestRunValidateWithWarningsAndErrors(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	path := writeTempConfig(t, `{"graphs": {}, "grpahs": {}}`)
-
-	exitCode := Run([]string{"validate", "-c", path}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	errOut := stderr.String()
-	if !strings.Contains(errOut, "No graphs found") {
-		t.Fatalf("expected stderr to contain 'No graphs found', got %q", errOut)
-	}
-	if !strings.Contains(strings.ToLower(errOut), "warning") {
-		t.Fatalf("expected stderr to contain 'warning', got %q", errOut)
-	}
-}
-
-func TestRunValidateWithInvalidPackageJSON(t *testing.T) {
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-
-	dir := t.TempDir()
-	configPath := filepath.Join(dir, "langgraph.json")
-	packagePath := filepath.Join(dir, "package.json")
-	if err := os.WriteFile(
-		configPath,
-		[]byte(`{"node_version":"20","graphs":{"agent":"./agent.js:graph"}}`),
-		0644,
-	); err != nil {
-		t.Fatalf("failed to write config: %v", err)
-	}
-	if err := os.WriteFile(packagePath, []byte(`{invalid json`), 0644); err != nil {
-		t.Fatalf("failed to write package.json: %v", err)
-	}
-
-	exitCode := Run([]string{"validate", "-c", configPath}, &stdout, &stderr)
-
-	if exitCode != 1 {
-		t.Fatalf("expected exit code 1, got %d", exitCode)
-	}
-	if !strings.Contains(stderr.String(), "Invalid package.json found") {
-		t.Fatalf("expected stderr to mention invalid package.json, got %q", stderr.String())
-	}
-}
-
-func TestRunDeployDelegatesToPythonCLI(t *testing.T) {
-	t.Setenv("LANGGRAPH_CALLING_PYTHON", "/custom/python")
-
-	originalRunPythonSubprocess := runPythonSubprocess
-	t.Cleanup(func() {
-		runPythonSubprocess = originalRunPythonSubprocess
-	})
-
-	var gotPython string
-	var gotArgs []string
-	runPythonSubprocess = func(
-		pythonExe string,
-		args []string,
-		stdout io.Writer,
-		stderr io.Writer,
-	) error {
-		gotPython = pythonExe
-		gotArgs = append([]string(nil), args...)
-		return nil
-	}
-
-	var stdout bytes.Buffer
-	var stderr bytes.Buffer
-	exitCode := Run([]string{"deploy", "--remote", "--install-command", "make deps"}, &stdout, &stderr)
-
-	if exitCode != 0 {
-		t.Fatalf("expected exit code 0, got %d; stderr: %q", exitCode, stderr.String())
-	}
-	if gotPython != "/custom/python" {
-		t.Fatalf("expected delegated python to be /custom/python, got %q", gotPython)
-	}
-	expected := []string{"-m", "langgraph_cli.cli", "deploy", "--remote", "--install-command", "make deps"}
-	if strings.Join(gotArgs, "\x00") != strings.Join(expected, "\x00") {
-		t.Fatalf("unexpected delegated args: got %q want %q", gotArgs, expected)
-	}
-}

libs/cli/internal/templates/templates.go

@@ -1,258 +0,0 @@
-// Package templates provides template definitions and project scaffolding
-// for the LangGraph CLI `new` command.
-package templates
-
-import (
-	"archive/zip"
-	"fmt"
-	"io"
-	"net/http"
-	"os"
-	"path/filepath"
-	"sort"
-	"strings"
-)
-
-// Template describes a project template with language-specific download URLs.
-type Template struct {
-	Name        string
-	Description string
-	Languages   map[string]string // lang -> download URL
-}
-
-// Templates is the ordered list of available project templates.
-var Templates = []Template{
-	{
-		Name:        "Deep Agent",
-		Description: "An opinionated deployment template for a Deep Agent.",
-		Languages: map[string]string{
-			"python": "https://github.com/langchain-ai/deep-agent-template/archive/refs/heads/main.zip",
-			"js":     "https://github.com/langchain-ai/deep-agent-template-js/archive/refs/heads/main.zip",
-		},
-	},
-	{
-		Name:        "Agent",
-		Description: "A simple agent that can be flexibly extended to many tools.",
-		Languages: map[string]string{
-			"python": "https://github.com/langchain-ai/simple-agent-template/archive/refs/heads/main.zip",
-		},
-	},
-	{
-		Name:        "New LangGraph Project",
-		Description: "A simple, minimal chatbot with memory.",
-		Languages: map[string]string{
-			"python": "https://github.com/langchain-ai/new-langgraph-project/archive/refs/heads/main.zip",
-			"js":     "https://github.com/langchain-ai/new-langgraphjs-project/archive/refs/heads/main.zip",
-		},
-	},
-}
-
-// templateIDEntry maps a template ID to its download URL, template name, and language.
-type templateIDEntry struct {
-	URL      string
-	Name     string
-	Language string
-}
-
-// templateIDMap is built once at init time from the Templates slice.
-var templateIDMap map[string]templateIDEntry
-
-func init() {
-	templateIDMap = make(map[string]templateIDEntry)
-	for _, t := range Templates {
-		for lang, url := range t.Languages {
-			if lang != "python" && lang != "js" {
-				continue
-			}
-			id := toTemplateID(t.Name, lang)
-			templateIDMap[id] = templateIDEntry{
-				URL:      url,
-				Name:     t.Name,
-				Language: lang,
-			}
-		}
-	}
-}
-
-// toTemplateID converts a template name and language into a slug like "deep-agent-python".
-func toTemplateID(name, lang string) string {
-	return strings.ToLower(strings.ReplaceAll(name, " ", "-")) + "-" + lang
-}
-
-// ListTemplateIDs returns a sorted list of all available template IDs.
-func ListTemplateIDs() []string {
-	ids := make([]string, 0, len(templateIDMap))
-	for id := range templateIDMap {
-		ids = append(ids, id)
-	}
-	sort.Strings(ids)
-	return ids
-}
-
-// TemplateHelp returns a formatted help string listing available templates.
-func TemplateHelp() string {
-	var b strings.Builder
-	b.WriteString("The name of the template to use. Available options:\n")
-	for _, id := range ListTemplateIDs() {
-		entry := templateIDMap[id]
-		// Find the description from the Templates slice.
-		var desc string
-		for _, t := range Templates {
-			if t.Name == entry.Name {
-				desc = t.Description
-				break
-			}
-		}
-		fmt.Fprintf(&b, "  %s: %s\n", id, desc)
-	}
-	return b.String()
-}
-
-// CreateNew creates a new LangGraph project at path using the given templateID.
-//
-// If templateID is empty an error listing available templates is returned (the
-// Go CLI is non-interactive, so we cannot prompt).  If path is empty an error
-// is returned.
-func CreateNew(path, templateID string) error {
-	if path == "" {
-		return fmt.Errorf("path is required: specify the directory for the new project")
-	}
-
-	// Resolve to absolute path.
-	absPath, err := filepath.Abs(path)
-	if err != nil {
-		return fmt.Errorf("cannot resolve path: %w", err)
-	}
-	path = absPath
-
-	// Check if path exists and is not empty.
-	entries, err := os.ReadDir(path)
-	if err == nil && len(entries) > 0 {
-		return fmt.Errorf(
-			"the specified directory already exists and is not empty: %s. "+
-				"Aborting to prevent overwriting files", path)
-	}
-
-	if templateID == "" {
-		return fmt.Errorf(
-			"template is required. Use one of the following template IDs:\n%s",
-			TemplateHelp())
-	}
-
-	entry, ok := templateIDMap[templateID]
-	if !ok {
-		var sb strings.Builder
-		sb.WriteString(fmt.Sprintf("template %q not found.\n", templateID))
-		sb.WriteString("Please select from the available options:\n")
-		for _, id := range ListTemplateIDs() {
-			e := templateIDMap[id]
-			var desc string
-			for _, t := range Templates {
-				if t.Name == e.Name {
-					desc = t.Description
-					break
-				}
-			}
-			fmt.Fprintf(&sb, "  - %s: %s\n", id, desc)
-		}
-		return fmt.Errorf("%s", sb.String())
-	}
-
-	if err := DownloadAndExtract(entry.URL, path); err != nil {
-		return fmt.Errorf("failed to download template: %w", err)
-	}
-
-	return nil
-}
-
-// DownloadAndExtract downloads a ZIP archive from url and extracts it to
-// destPath, stripping the top-level wrapper directory that GitHub includes
-// in repository archives.
-func DownloadAndExtract(url, destPath string) error {
-	// Ensure destination directory exists.
-	if err := os.MkdirAll(destPath, 0o755); err != nil {
-		return fmt.Errorf("cannot create destination directory: %w", err)
-	}
-
-	// Download to a temporary file.
-	tmpFile, err := os.CreateTemp("", "langgraph-template-*.zip")
-	if err != nil {
-		return fmt.Errorf("cannot create temp file: %w", err)
-	}
-	tmpPath := tmpFile.Name()
-	defer os.Remove(tmpPath)
-
-	resp, err := http.Get(url) //nolint:gosec
-	if err != nil {
-		tmpFile.Close()
-		return fmt.Errorf("HTTP request failed: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		tmpFile.Close()
-		return fmt.Errorf("HTTP %d: failed to download %s", resp.StatusCode, url)
-	}
-
-	if _, err := io.Copy(tmpFile, resp.Body); err != nil {
-		tmpFile.Close()
-		return fmt.Errorf("failed to write ZIP data: %w", err)
-	}
-	tmpFile.Close()
-
-	// Open the ZIP archive.
-	zr, err := zip.OpenReader(tmpPath)
-	if err != nil {
-		return fmt.Errorf("failed to open ZIP archive: %w", err)
-	}
-	defer zr.Close()
-
-	for _, f := range zr.File {
-		// Strip the first path component (GitHub's wrapper directory).
-		parts := strings.SplitN(f.Name, "/", 2)
-		if len(parts) < 2 || parts[1] == "" {
-			continue // skip the wrapper directory entry itself
-		}
-		relPath := parts[1]
-
-		outPath := filepath.Join(destPath, relPath)
-
-		// Ensure the output path is within destPath (zip-slip protection).
-		if !strings.HasPrefix(filepath.Clean(outPath), filepath.Clean(destPath)+string(os.PathSeparator)) {
-			continue
-		}
-
-		if f.FileInfo().IsDir() {
-			if err := os.MkdirAll(outPath, f.Mode()); err != nil {
-				return fmt.Errorf("cannot create directory %s: %w", outPath, err)
-			}
-			continue
-		}
-
-		// Create parent directories.
-		if err := os.MkdirAll(filepath.Dir(outPath), 0o755); err != nil {
-			return fmt.Errorf("cannot create parent directory: %w", err)
-		}
-
-		outFile, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, f.Mode())
-		if err != nil {
-			return fmt.Errorf("cannot create file %s: %w", outPath, err)
-		}
-
-		rc, err := f.Open()
-		if err != nil {
-			outFile.Close()
-			return fmt.Errorf("cannot read ZIP entry %s: %w", f.Name, err)
-		}
-
-		if _, err := io.Copy(outFile, rc); err != nil {
-			rc.Close()
-			outFile.Close()
-			return fmt.Errorf("failed writing %s: %w", outPath, err)
-		}
-		rc.Close()
-		outFile.Close()
-	}
-
-	return nil
-}

libs/cli/internal/version/version.go

@@ -1,7 +0,0 @@
-package version
-
-var (
-	Version = "dev"
-	Commit  = "unknown"
-	Date    = "unknown"
-)

libs/cli/js-examples/yarn.lock

@@ -1086,11 +1086,6 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.3.tgz#6209321eb2c1712a7e7466422b8cb1fc0d9dd5d8"
   integrity sha512-9aEbYZ3TbYMznPdcdr3SmIrLXwC/AKZXQeCf9Pgao5CKb8CyHuEX5jzWPTkvregvhRJHcpRO6BFoGW9ycaOkYw==
 
-"@types/uuid@^10.0.0":
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-10.0.0.tgz#e9c07fe50da0f53dc24970cca94d619ff03f6f6d"
-  integrity sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ==
-
 "@types/yargs-parser@*":
   version "21.0.3"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-21.0.3.tgz#815e30b786d2e8f0dcd85fd5bcf5e1a04d008f15"
@@ -1782,13 +1777,6 @@ concat-map@0.0.1:
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
   integrity sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==
 
-console-table-printer@^2.12.1:
-  version "2.15.0"
-  resolved "https://registry.yarnpkg.com/console-table-printer/-/console-table-printer-2.15.0.tgz#5c808204640b8f024d545bde8aabe5d344dfadc1"
-  integrity sha512-SrhBq4hYVjLCkBVOWaTzceJalvn5K1Zq5aQA6wXC/cYjI3frKWNPEMK3sZsJfNNQApvCQmgBcc13ZKmFj8qExw==
-  dependencies:
-    simple-wcswidth "^1.1.2"
-
 convert-source-map@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-2.0.0.tgz#4b560f649fc4e918dd0ab75cf4961e8bc882d82a"
@@ -3688,16 +3676,12 @@ keyv@^4.5.4:
     json-buffer "3.0.1"
 
 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.4"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.4.tgz#f75b82b08e30db72a7d1d595b341e9666bd525e5"
-  integrity sha512-qYkNIoKpf0ZYt+cYzrDV+XI3FCexApmZmp8EMs3eDTMv0OvrHMLoxJ9IpkeoXJSX24+GPk0/jXjKx2hWerpy9w==
+  version "0.5.20"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
+  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
   dependencies:
-    "@types/uuid" "^10.0.0"
-    chalk "^4.1.2"
-    console-table-printer "^2.12.1"
-    p-queue "^6.6.2"
-    semver "^7.6.3"
-    uuid "^10.0.0"
+    p-queue "6.6.2"
+    uuid "10.0.0"
 
 leven@^3.1.0:
   version "3.1.0"
@@ -4007,7 +3991,7 @@ p-locate@^5.0.0:
   dependencies:
     p-limit "^3.0.2"
 
-p-queue@^6.6.2:
+p-queue@6.6.2, p-queue@^6.6.2:
   version "6.6.2"
   resolved "https://registry.yarnpkg.com/p-queue/-/p-queue-6.6.2.tgz#2068a9dcf8e67dd0ec3e7a2bcb76810faa85e426"
   integrity sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==
@@ -4303,7 +4287,7 @@ semver@^6.3.1:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
   integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==
 
-semver@^7.5.3, semver@^7.5.4, semver@^7.6.3, semver@^7.7.2, semver@^7.7.3:
+semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3:
   version "7.7.4"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.4.tgz#28464e36060e991fa7a11d0279d2d3f3b57a7e8a"
   integrity sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==
@@ -4411,11 +4395,6 @@ signal-exit@^4.0.1:
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-4.1.0.tgz#952188c1cbd546070e2dd20d0f41c0ae0530cb04"
   integrity sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==
 
-simple-wcswidth@^1.1.2:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/simple-wcswidth/-/simple-wcswidth-1.1.2.tgz#66722f37629d5203f9b47c5477b1225b85d6525b"
-  integrity sha512-j7piyCjAeTDSjzTSQ7DokZtMNwNlEAyxqSZeCS+CXH7fJ4jx3FuJ/mTW3mE+6JLs4VJBbcll0Kjn+KXI5t21Iw==
-
 slash@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
@@ -4870,7 +4849,7 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-uuid@^10.0.0:
+uuid@10.0.0, uuid@^10.0.0:
   version "10.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-10.0.0.tgz#5a95aa454e6e002725c79055fd42aaba30ca6294"
   integrity sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==

libs/cli/js-monorepo-example/yarn.lock

@@ -217,11 +217,6 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==
 
-"@types/uuid@^10.0.0":
-  version "10.0.0"
-  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-10.0.0.tgz#e9c07fe50da0f53dc24970cca94d619ff03f6f6d"
-  integrity sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ==
-
 "@typescript-eslint/eslint-plugin@^8.58.0":
   version "8.58.0"
   resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.58.0.tgz#ad40e492f1931f46da1bd888e52b9e56df9063aa"
@@ -343,13 +338,6 @@ ajv@^6.14.0:
     json-schema-traverse "^0.4.1"
     uri-js "^4.2.2"
 
-ansi-styles@^4.1.0:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.3.0.tgz#edd803628ae71c04c85ae7a0906edad34b648937"
-  integrity sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==
-  dependencies:
-    color-convert "^2.0.1"
-
 ansi-styles@^5.0.0:
   version "5.2.0"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
@@ -508,38 +496,11 @@ camelcase@6:
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-6.3.0.tgz#5685b95eb209ac9c0c177467778c9c84df58ba9a"
   integrity sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==
 
-chalk@^4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.2.tgz#aac4e2b7734a740867aeb16bf02aad556a1e7a01"
-  integrity sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==
-  dependencies:
-    ansi-styles "^4.1.0"
-    supports-color "^7.1.0"
-
-color-convert@^2.0.1:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-2.0.1.tgz#72d3a68d598c9bdb3af2ad1e84f21d896abd4de3"
-  integrity sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==
-  dependencies:
-    color-name "~1.1.4"
-
-color-name@~1.1.4:
-  version "1.1.4"
-  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
-  integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
-
 concat-map@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
   integrity sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==
 
-console-table-printer@^2.12.1:
-  version "2.14.6"
-  resolved "https://registry.yarnpkg.com/console-table-printer/-/console-table-printer-2.14.6.tgz#edfe0bf311fa2701922ed509443145ab51e06436"
-  integrity sha512-MCBl5HNVaFuuHW6FGbL/4fB7N/ormCy+tQ+sxTrF6QtSbSNETvPuOVbkJBhzDgYhvjWGrTma4eYJa37ZuoQsPw==
-  dependencies:
-    simple-wcswidth "^1.0.1"
-
 cross-spawn@^7.0.6:
   version "7.0.6"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.6.tgz#8a58fe78f00dcd70c370451759dfbfaf03e8ee9f"
@@ -1059,11 +1020,6 @@ has-bigints@^1.0.2:
   resolved "https://registry.yarnpkg.com/has-bigints/-/has-bigints-1.1.0.tgz#28607e965ac967e03cd2a2c70a2636a1edad49fe"
   integrity sha512-R3pbpkcIqv2Pm3dUwgjclDRVmWpTJW2DcMzcIhEXEx1oh/CEMObMm3KLmRJOdvhM7o4uQBnwr8pzRK2sJWIqfg==
 
-has-flag@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-4.0.0.tgz#944771fd9c81c81265c4d6941860da06bb59479b"
-  integrity sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==
-
 has-property-descriptors@^1.0.0, has-property-descriptors@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/has-property-descriptors/-/has-property-descriptors-1.0.2.tgz#963ed7d071dc7bf5f084c5bfbe0d1b6222586854"
@@ -1372,16 +1328,12 @@ keyv@^4.5.4:
     json-buffer "3.0.1"
 
 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.4"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.4.tgz#f75b82b08e30db72a7d1d595b341e9666bd525e5"
-  integrity sha512-qYkNIoKpf0ZYt+cYzrDV+XI3FCexApmZmp8EMs3eDTMv0OvrHMLoxJ9IpkeoXJSX24+GPk0/jXjKx2hWerpy9w==
+  version "0.5.20"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
+  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
   dependencies:
-    "@types/uuid" "^10.0.0"
-    chalk "^4.1.2"
-    console-table-printer "^2.12.1"
-    p-queue "^6.6.2"
-    semver "^7.6.3"
-    uuid "^10.0.0"
+    p-queue "6.6.2"
+    uuid "10.0.0"
 
 levn@^0.4.1:
   version "0.4.1"
@@ -1528,7 +1480,7 @@ p-locate@^5.0.0:
   dependencies:
     p-limit "^3.0.2"
 
-p-queue@^6.6.2:
+p-queue@6.6.2, p-queue@^6.6.2:
   version "6.6.2"
   resolved "https://registry.yarnpkg.com/p-queue/-/p-queue-6.6.2.tgz#2068a9dcf8e67dd0ec3e7a2bcb76810faa85e426"
   integrity sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==
@@ -1690,11 +1642,6 @@ semver@^6.3.1:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
   integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==
 
-semver@^7.6.3:
-  version "7.7.2"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.2.tgz#67d99fdcd35cec21e6f8b87a7fd515a33f982b58"
-  integrity sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==
-
 semver@^7.7.3:
   version "7.7.4"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.4.tgz#28464e36060e991fa7a11d0279d2d3f3b57a7e8a"
@@ -1783,11 +1730,6 @@ side-channel@^1.1.0:
     side-channel-map "^1.0.1"
     side-channel-weakmap "^1.0.2"
 
-simple-wcswidth@^1.0.1:
-  version "1.1.2"
-  resolved "https://registry.yarnpkg.com/simple-wcswidth/-/simple-wcswidth-1.1.2.tgz#66722f37629d5203f9b47c5477b1225b85d6525b"
-  integrity sha512-j7piyCjAeTDSjzTSQ7DokZtMNwNlEAyxqSZeCS+CXH7fJ4jx3FuJ/mTW3mE+6JLs4VJBbcll0Kjn+KXI5t21Iw==
-
 stop-iteration-iterator@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/stop-iteration-iterator/-/stop-iteration-iterator-1.1.0.tgz#f481ff70a548f6124d0312c3aa14cbfa7aa542ad"
@@ -1838,13 +1780,6 @@ strip-json-comments@^3.1.1:
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-3.1.1.tgz#31f1281b3832630434831c310c01cccda8cbe006"
   integrity sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==
 
-supports-color@^7.1.0:
-  version "7.2.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-7.2.0.tgz#1b7dcdcb32b8138801b3e478ba6a51caa89648da"
-  integrity sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==
-  dependencies:
-    has-flag "^4.0.0"
-
 supports-preserve-symlinks-flag@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz#6eda4bd344a3c94aea376d4cc31bc77311039e09"
@@ -1966,7 +1901,7 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-uuid@^10.0.0:
+uuid@10.0.0, uuid@^10.0.0:
   version "10.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-10.0.0.tgz#5a95aa454e6e002725c79055fd42aaba30ca6294"
   integrity sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==

libs/cli/langgraph_cli/__init__.py

@@ -1 +1 @@
-__version__ = "0.4.21"
+__version__ = "0.4.23"

libs/cli/langgraph_cli/__main__.py

@@ -1,4 +1,4 @@
-from .entrypoint import main
+from .cli import cli
 
 if __name__ == "__main__":
-    main()
+    cli()

libs/cli/langgraph_cli/analytics.py

@@ -26,8 +26,15 @@ class LogData(TypedDict):
     params: dict[str, Any]
 
 
-def get_anonymized_params(kwargs: dict[str, Any]) -> dict[str, bool]:
-    params = {}
+def get_anonymized_params(
+    kwargs: dict[str, Any], *, cli_command: str
+) -> dict[str, bool | str]:
+    params: dict[str, bool | str] = {}
+
+    if cli_command == "deploy" and (
+        analytics_source := os.getenv("LANGGRAPH_CLI_ANALYTICS_SOURCE")
+    ):
+        params["source"] = analytics_source
 
     # anonymize params with values
     if config := kwargs.get("config"):
@@ -88,7 +95,7 @@ def log_command(func):
             "python_version": platform.python_version(),
             "cli_version": __version__,
             "cli_command": func.__name__,
-            "params": get_anonymized_params(kwargs),
+            "params": get_anonymized_params(kwargs, cli_command=func.__name__),
         }
 
         background_thread = threading.Thread(target=log_data, args=(data,))

libs/cli/langgraph_cli/entrypoint.py

@@ -1,74 +0,0 @@
-"""User-facing entrypoint for the LangGraph CLI."""
-
-from __future__ import annotations
-
-import os
-import pathlib
-import sys
-from collections.abc import Sequence
-
-import click
-
-from .cli import cli
-
-_GO_CLI_FLAG = "LANGGRAPH_USE_GO_CLI"
-_GO_CLI_PATH_ENV = "LANGGRAPH_GO_CLI_PATH"
-_CALLING_PYTHON_ENV = "LANGGRAPH_CALLING_PYTHON"
-
-_TRUE_VALUES = frozenset({"1", "true", "yes", "on"})
-
-
-def _legacy_cli(argv: Sequence[str] | None = None) -> None:
-    cli.main(args=list(argv) if argv is not None else None, prog_name="langgraph")
-
-
-def _should_use_go_cli() -> bool:
-    value = os.environ.get(_GO_CLI_FLAG, "")
-    return value.strip().lower() in _TRUE_VALUES
-
-
-def _bundled_go_cli_path() -> pathlib.Path:
-    binary_name = "langgraph.exe" if os.name == "nt" else "langgraph"
-    return pathlib.Path(__file__).resolve().parent / "bin" / binary_name
-
-
-def _resolve_go_cli_path() -> pathlib.Path | None:
-    override = os.environ.get(_GO_CLI_PATH_ENV)
-    if override:
-        path = pathlib.Path(override).expanduser()
-        return path.resolve()
-
-    bundled = _bundled_go_cli_path()
-    if bundled.is_file():
-        return bundled
-
-    return None
-
-
-def _exec_go_cli(argv: Sequence[str]) -> None:
-    path = _resolve_go_cli_path()
-    if path is None:
-        raise click.ClickException(
-            "Go CLI requested via LANGGRAPH_USE_GO_CLI, but no langgraph binary was "
-            "found. Set LANGGRAPH_GO_CLI_PATH or install a wheel that bundles the "
-            "binary."
-        )
-    if not path.is_file():
-        raise click.ClickException(
-            f"LANGGRAPH_GO_CLI_PATH points to a missing file: {path}"
-        )
-
-    env = os.environ.copy()
-    env.setdefault(_CALLING_PYTHON_ENV, sys.executable)
-    os.execvpe(str(path), [str(path), *argv], env)
-
-
-def main(argv: Sequence[str] | None = None) -> None:
-    args = list(sys.argv[1:] if argv is None else argv)
-    try:
-        if _should_use_go_cli():
-            _exec_go_cli(args)
-        _legacy_cli(args)
-    except click.ClickException as exc:
-        exc.show()
-        raise SystemExit(exc.exit_code) from exc

libs/cli/pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
 path = "langgraph_cli/__init__.py"
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.5.35,<0.8.0 ; python_version >= '3.11'",
+    "langgraph-api>=0.5.35,<0.9.0 ; python_version >= '3.11'",
     "langgraph-runtime-inmem>=0.7 ; python_version >= '3.11'",
 ]
 
@@ -34,7 +34,7 @@ Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 
 [project.scripts]
-langgraph = "langgraph_cli.entrypoint:main"
+langgraph = "langgraph_cli.cli:cli"
 
 [dependency-groups]
 test = [
@@ -61,9 +61,6 @@ default-groups = ['dev']
 [tool.hatch.build.targets.wheel]
 include = ["langgraph_cli"]
 
-[tool.hatch.build.targets.wheel.hooks.custom]
-path = "hatch_build.py"
-
 [tool.pytest.ini_options]
 addopts = "--strict-markers --strict-config --durations=5 -vv"
 asyncio_mode = "auto"

libs/cli/tests/unit_tests/test_entrypoint.py

@@ -1,116 +0,0 @@
-import pathlib
-import sys
-
-import pytest
-
-from langgraph_cli import entrypoint
-
-
-def test_main_uses_legacy_cli_when_go_flag_disabled(monkeypatch):
-    captured = {}
-
-    def fake_legacy(argv):
-        captured["argv"] = list(argv)
-
-    monkeypatch.delenv("LANGGRAPH_USE_GO_CLI", raising=False)
-    monkeypatch.setattr(entrypoint, "_legacy_cli", fake_legacy)
-
-    entrypoint.main(["build", "-t", "demo"])
-
-    assert captured == {"argv": ["build", "-t", "demo"]}
-
-
-def test_main_execs_go_cli_when_flag_enabled(monkeypatch, tmp_path):
-    binary_path = tmp_path / "langgraph"
-    binary_path.write_text("")
-
-    captured = {}
-
-    def fake_execvpe(file, args, env):
-        captured["file"] = file
-        captured["args"] = args
-        captured["env"] = env.copy()
-        raise SystemExit(0)
-
-    monkeypatch.setenv("LANGGRAPH_USE_GO_CLI", "1")
-    monkeypatch.setenv("LANGGRAPH_GO_CLI_PATH", str(binary_path))
-    monkeypatch.delenv("LANGGRAPH_CALLING_PYTHON", raising=False)
-    monkeypatch.setattr(entrypoint.os, "execvpe", fake_execvpe)
-
-    with pytest.raises(SystemExit, match="0"):
-        entrypoint.main(["dev", "--port", "8000"])
-
-    assert captured["file"] == str(binary_path)
-    assert captured["args"] == [str(binary_path), "dev", "--port", "8000"]
-    assert captured["env"]["LANGGRAPH_CALLING_PYTHON"] == sys.executable
-
-
-def test_main_preserves_existing_calling_python(monkeypatch, tmp_path):
-    binary_path = tmp_path / "langgraph"
-    binary_path.write_text("")
-
-    captured = {}
-
-    def fake_execvpe(file, args, env):
-        captured["env"] = env.copy()
-        raise SystemExit(0)
-
-    monkeypatch.setenv("LANGGRAPH_USE_GO_CLI", "true")
-    monkeypatch.setenv("LANGGRAPH_GO_CLI_PATH", str(binary_path))
-    monkeypatch.setenv("LANGGRAPH_CALLING_PYTHON", "/custom/python")
-    monkeypatch.setattr(entrypoint.os, "execvpe", fake_execvpe)
-
-    with pytest.raises(SystemExit, match="0"):
-        entrypoint.main(["dev"])
-
-    assert captured["env"]["LANGGRAPH_CALLING_PYTHON"] == "/custom/python"
-
-
-def test_main_errors_when_go_cli_requested_but_binary_missing(
-    monkeypatch, capsys, tmp_path
-):
-    missing_path = tmp_path / "missing-langgraph"
-
-    monkeypatch.setenv("LANGGRAPH_USE_GO_CLI", "1")
-    monkeypatch.setenv("LANGGRAPH_GO_CLI_PATH", str(missing_path))
-
-    with pytest.raises(SystemExit, match="1"):
-        entrypoint.main(["build"])
-
-    err = capsys.readouterr().err
-    assert "LANGGRAPH_GO_CLI_PATH points to a missing file" in err
-
-
-def test_resolve_go_cli_path_prefers_override(monkeypatch, tmp_path):
-    override = tmp_path / "custom-langgraph"
-    override.write_text("")
-    bundled = tmp_path / "bin" / "langgraph"
-    bundled.parent.mkdir()
-    bundled.write_text("")
-
-    monkeypatch.setenv("LANGGRAPH_GO_CLI_PATH", str(override))
-    monkeypatch.setattr(entrypoint, "_bundled_go_cli_path", lambda: bundled)
-
-    assert entrypoint._resolve_go_cli_path() == override.resolve()
-
-
-def test_resolve_go_cli_path_uses_bundled_binary(monkeypatch, tmp_path):
-    bundled = tmp_path / "bin" / "langgraph"
-    bundled.parent.mkdir()
-    bundled.write_text("")
-
-    monkeypatch.delenv("LANGGRAPH_GO_CLI_PATH", raising=False)
-    monkeypatch.setattr(entrypoint, "_bundled_go_cli_path", lambda: bundled)
-
-    assert entrypoint._resolve_go_cli_path() == bundled
-
-
-def test_resolve_go_cli_path_returns_none_when_nothing_available(monkeypatch):
-    monkeypatch.delenv("LANGGRAPH_GO_CLI_PATH", raising=False)
-    monkeypatch.setattr(
-        entrypoint,
-        "_bundled_go_cli_path",
-        lambda: pathlib.Path("/definitely/not/present/langgraph"),
-    )
-
-    assert entrypoint._resolve_go_cli_path() is None

libs/cli/tests/unit_tests/test_go_cli_smoke.py

@@ -1,67 +0,0 @@
-import os
-import shutil
-import subprocess
-
-import pytest
-
-
-@pytest.fixture
-def go_cli_env():
-    if os.environ.get("LANGGRAPH_USE_GO_CLI") != "1":
-        pytest.skip("Go CLI smoke tests only run when LANGGRAPH_USE_GO_CLI=1")
-
-    langgraph = shutil.which("langgraph")
-    assert langgraph is not None, "langgraph executable is not installed"
-
-    env = os.environ.copy()
-    env["LANGGRAPH_USE_GO_CLI"] = "1"
-    return langgraph, env
-
-
-def test_go_cli_help(go_cli_env):
-    langgraph, env = go_cli_env
-
-    result = subprocess.run(
-        [langgraph, "--help"],
-        capture_output=True,
-        text=True,
-        env=env,
-        check=False,
-    )
-
-    assert result.returncode == 0, result.stderr
-    assert "Usage: langgraph" in result.stdout
-
-
-def test_go_cli_validate(go_cli_env, tmp_path):
-    langgraph, env = go_cli_env
-    config_path = tmp_path / "langgraph.json"
-    config_path.write_text(
-        '{"dependencies": ["langchain"], "graphs": {"agent": "./agent.py:graph"}}'
-    )
-
-    result = subprocess.run(
-        [langgraph, "validate", "-c", str(config_path)],
-        capture_output=True,
-        text=True,
-        env=env,
-        check=False,
-    )
-
-    assert result.returncode == 0, result.stderr
-    assert "is valid" in result.stdout
-
-
-def test_go_cli_dev_help(go_cli_env):
-    langgraph, env = go_cli_env
-
-    result = subprocess.run(
-        [langgraph, "dev", "--help"],
-        capture_output=True,
-        text=True,
-        env=env,
-        check=False,
-    )
-
-    assert result.returncode == 0, result.stderr
-    assert "Run LangGraph API server in development mode" in result.stdout

libs/cli/uv-examples/monorepo/uv.lock

@@ -215,7 +215,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.27"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -227,9 +227,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/13/5c/56d19a252bbb26247b7a7cd20821d48804d7ca03212fec709cd8db7c2516/langchain_core-1.2.27.tar.gz", hash = "sha256:c18372e4c4c1454d49bf23a2e484431e71bd39b64173a0f621f0fc283d7183a4", size = 844935, upload-time = "2026-04-07T14:56:32.364Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c1/c3/6e0865bc130c448270eb9511b47863a3f9145cdb519b19f6e4758fa63d6f/langchain_core-1.2.27-py3-none-any.whl", hash = "sha256:9ecd6b0393b969fe88f6b9b309367134080ab095946d79e6937dd3911aa42bd5", size = 508315, upload-time = "2026-04-07T14:56:30.93Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]
 
 [[package]]
@@ -290,7 +290,7 @@ wheels = [
 
 [[package]]
 name = "langsmith"
-version = "0.7.26"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -303,9 +303,9 @@ dependencies = [
     { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [[package]]

libs/cli/uv-examples/simple/uv.lock

@@ -191,7 +191,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.27"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -203,9 +203,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/13/5c/56d19a252bbb26247b7a7cd20821d48804d7ca03212fec709cd8db7c2516/langchain_core-1.2.27.tar.gz", hash = "sha256:c18372e4c4c1454d49bf23a2e484431e71bd39b64173a0f621f0fc283d7183a4", size = 844935, upload-time = "2026-04-07T14:56:32.364Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c1/c3/6e0865bc130c448270eb9511b47863a3f9145cdb519b19f6e4758fa63d6f/langchain_core-1.2.27-py3-none-any.whl", hash = "sha256:9ecd6b0393b969fe88f6b9b309367134080ab095946d79e6937dd3911aa42bd5", size = 508315, upload-time = "2026-04-07T14:56:30.93Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]
 
 [[package]]
@@ -266,7 +266,7 @@ wheels = [
 
 [[package]]
 name = "langsmith"
-version = "0.7.26"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -279,9 +279,9 @@ dependencies = [
     { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [[package]]

libs/langgraph/langgraph/_internal/_config.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from collections import ChainMap
-from collections.abc import Mapping, Sequence
+from collections.abc import Sequence
 from os import getenv
 from typing import Any, cast
 
@@ -217,14 +217,16 @@ def get_callback_manager_for_config(
             callbacks.add_tags(all_tags)
         if metadata := config.get("metadata"):
             callbacks.add_metadata(metadata)
-        return callbacks
+        manager = callbacks
     else:
         # otherwise create a new manager
-        return CallbackManager.configure(
+        manager = CallbackManager.configure(
             inheritable_callbacks=config.get("callbacks"),
             inheritable_tags=all_tags,
             inheritable_metadata=config.get("metadata"),
+            langsmith_inheritable_metadata=_get_tracing_metadata_defaults(config),
         )
+    return manager
 
 
 def get_async_callback_manager_for_config(
@@ -255,14 +257,16 @@ def get_async_callback_manager_for_config(
             callbacks.add_tags(all_tags)
         if metadata := config.get("metadata"):
             callbacks.add_metadata(metadata)
-        return callbacks
+        manager = callbacks
     else:
         # otherwise create a new manager
-        return AsyncCallbackManager.configure(
+        manager = AsyncCallbackManager.configure(
             inheritable_callbacks=config.get("callbacks"),
             inheritable_tags=all_tags,
             inheritable_metadata=config.get("metadata"),
+            langsmith_inheritable_metadata=_get_tracing_metadata_defaults(config),
         )
+    return manager
 
 
 def _is_not_empty(value: Any) -> bool:
@@ -308,22 +312,54 @@ def ensure_config(*configs: RunnableConfig | None) -> RunnableConfig:
         for k, v in config.items():
             if _is_not_empty(v) and k not in CONFIG_KEYS:
                 empty[CONF][k] = v
-    _empty_metadata = empty["metadata"]
-    for key, value in empty[CONF].items():
-        if _exclude_as_metadata(key, value, _empty_metadata):
-            continue
-        _empty_metadata[key] = value
+
+    configurable = empty.get("configurable")
+    metadata = empty.get("metadata")
+    if configurable and metadata is not None:
+        for key in _PROPAGATE_TO_METADATA:
+            if key in metadata:
+                continue
+            value = configurable.get(key)
+            if value:
+                metadata[key] = value
     return empty
 
 
 _OMIT = ("key", "token", "secret", "password", "auth")
 
 
-def _exclude_as_metadata(key: str, value: Any, metadata: Mapping[str, Any]) -> bool:
+def _exclude_as_metadata(key: str, value: Any) -> bool:
     key_lower = key.casefold()
     return (
         key.startswith("__")
         or not isinstance(value, (str, int, float, bool))
-        or key in metadata
         or any(substr in key_lower for substr in _OMIT)
     )
+
+
+def _get_tracing_metadata_defaults(
+    config: RunnableConfig,
+) -> dict[str, Any] | None:
+    """Get tracer-only metadata defaults from configurable values."""
+    configurable = config.get("configurable")
+    if not configurable:
+        return None
+    metadata: dict[str, Any] = {}
+    for key, value in configurable.items():
+        if _exclude_as_metadata(key, value):
+            continue
+        metadata[key] = value
+    return metadata or None
+
+
+_PROPAGATE_TO_METADATA = frozenset(
+    (
+        "thread_id",
+        "checkpoint_id",
+        "checkpoint_ns",
+        "task_id",
+        "run_id",
+        "assistant_id",
+        "graph_id",
+    )
+)

libs/langgraph/langgraph/callbacks.py

@@ -0,0 +1,394 @@
+"""Graph lifecycle callback interfaces and event payloads.
+
+This module defines the public callback surface for observing LangGraph-specific
+lifecycle transitions such as interrupt and resume.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+from dataclasses import dataclass
+from typing import Any, Literal, TypeAlias, TypeVar
+from uuid import UUID
+
+from langchain_core.callbacks import BaseCallbackHandler, BaseCallbackManager
+from langchain_core.callbacks.manager import ahandle_event, handle_event
+from langchain_core.runnables import RunnableConfig
+
+from langgraph.types import Interrupt
+
+__all__ = (
+    "GraphCallbackHandler",
+    "GraphInterruptEvent",
+    "GraphLifecycleEvent",
+    "GraphLifecycleStatus",
+    "GraphResumeEvent",
+    "get_async_graph_callback_manager_for_config",
+    "get_sync_graph_callback_manager_for_config",
+)
+
+
+GraphLifecycleStatus: TypeAlias = Literal[
+    "input",
+    "pending",
+    "done",
+    "interrupt_before",
+    "interrupt_after",
+    "out_of_steps",
+]
+"""Allowed lifecycle statuses reported in graph lifecycle callback events."""
+
+
+@dataclass(frozen=True)
+class GraphInterruptEvent:
+    """Graph lifecycle event emitted when execution pauses for interrupts."""
+
+    run_id: UUID | None
+    """Run id for the current graph execution, if available."""
+
+    status: GraphLifecycleStatus
+    """Loop status when the interrupt was captured."""
+
+    checkpoint_id: str
+    """Checkpoint id associated with the interrupted execution."""
+
+    checkpoint_ns: tuple[str, ...]
+    """Checkpoint namespace path for the current graph or subgraph."""
+
+    interrupts: tuple[Interrupt, ...]
+    """Interrupt payloads that caused the graph to pause."""
+
+
+@dataclass(frozen=True)
+class GraphResumeEvent:
+    """Graph lifecycle event emitted when execution resumes from a checkpoint."""
+
+    run_id: UUID | None
+    """Run id for the current graph execution, if available."""
+
+    status: GraphLifecycleStatus
+    """Loop status when the resume was captured."""
+
+    checkpoint_id: str
+    """Checkpoint id the graph resumed from."""
+
+    checkpoint_ns: tuple[str, ...]
+    """Checkpoint namespace path for the current graph or subgraph."""
+
+
+GraphLifecycleEvent: TypeAlias = GraphInterruptEvent | GraphResumeEvent
+"""Union of all public graph lifecycle callback event payloads.
+
+Use this alias when a callback or helper can receive either interrupt or resume
+lifecycle events.
+"""
+
+
+class GraphCallbackHandler(BaseCallbackHandler):
+    """Base class for graph-level lifecycle callbacks.
+
+    Subclass this handler to observe graph lifecycle transitions that are
+    specific to LangGraph execution, rather than generic LangChain runnable
+    callbacks.
+
+    Instances can be passed through `config["callbacks"]` when invoking a
+    graph. Only handlers that inherit from `GraphCallbackHandler` receive these
+    lifecycle events.
+    """
+
+    def on_interrupt(self, event: GraphInterruptEvent) -> Any:
+        """Run when graph execution pauses due to one or more interrupts.
+
+        Args:
+            event: Interrupt lifecycle event payload.
+        """
+
+    def on_resume(self, event: GraphResumeEvent) -> Any:
+        """Run when graph execution resumes from a persisted checkpoint.
+
+        Args:
+            event: Resume lifecycle event payload.
+        """
+
+
+_MISSING = object()
+
+
+def _filter_graph_handlers(
+    handlers: list[BaseCallbackHandler],
+) -> list[GraphCallbackHandler]:
+    return [h for h in handlers if isinstance(h, GraphCallbackHandler)]
+
+
+def _init_base_manager(
+    manager: BaseCallbackManager,
+    handlers: Sequence[GraphCallbackHandler] | None,
+    inheritable_handlers: Sequence[GraphCallbackHandler] | None,
+    parent_run_id: UUID | None,
+    *,
+    tags: list[str] | None,
+    inheritable_tags: list[str] | None,
+    metadata: dict[str, Any] | None,
+    inheritable_metadata: dict[str, Any] | None,
+    run_id: UUID | None,
+) -> None:
+    base_handlers: list[BaseCallbackHandler] = []
+    base_inheritable_handlers: list[BaseCallbackHandler] = []
+    if handlers is not None:
+        base_handlers.extend(handlers)
+    if inheritable_handlers is not None:
+        base_inheritable_handlers.extend(inheritable_handlers)
+    BaseCallbackManager.__init__(
+        manager,
+        handlers=base_handlers,
+        inheritable_handlers=base_inheritable_handlers,
+        parent_run_id=parent_run_id,
+        tags=tags,
+        inheritable_tags=inheritable_tags,
+        metadata=metadata,
+        inheritable_metadata=inheritable_metadata,
+    )
+    manager.run_id = run_id  # type: ignore[attr-defined]
+
+
+def _configure_graph_callbacks(
+    cls: type[_GraphManagerT],
+    callbacks: object | None,
+    *,
+    run_id: UUID | None,
+) -> _GraphManagerT:
+    if callbacks is None:
+        return cls(run_id=run_id)
+    if isinstance(callbacks, cls):
+        return callbacks.copy(run_id=run_id)
+    if isinstance(callbacks, (_GraphCallbackManager, _AsyncGraphCallbackManager)):
+        # Cross-type: extract handlers into the requested cls.
+        return cls(
+            handlers=_filter_graph_handlers(callbacks.handlers),
+            inheritable_handlers=_filter_graph_handlers(callbacks.inheritable_handlers),
+            parent_run_id=callbacks.parent_run_id,
+            tags=callbacks.tags.copy(),
+            inheritable_tags=callbacks.inheritable_tags.copy(),
+            metadata=callbacks.metadata.copy(),
+            inheritable_metadata=callbacks.inheritable_metadata.copy(),
+            run_id=run_id,
+        )
+    if isinstance(callbacks, BaseCallbackManager):
+        return cls(
+            handlers=_filter_graph_handlers(callbacks.handlers),
+            inheritable_handlers=_filter_graph_handlers(callbacks.inheritable_handlers),
+            parent_run_id=callbacks.parent_run_id,
+            tags=callbacks.tags.copy(),
+            inheritable_tags=callbacks.inheritable_tags.copy(),
+            metadata=callbacks.metadata.copy(),
+            inheritable_metadata=callbacks.inheritable_metadata.copy(),
+            run_id=run_id,
+        )
+    if isinstance(callbacks, GraphCallbackHandler):
+        return cls((callbacks,), run_id=run_id)
+    if isinstance(callbacks, (str, bytes)) or not isinstance(callbacks, Sequence):
+        raise TypeError("callbacks must be a handler, sequence, or manager")
+    return cls(_filter_graph_handlers(list(callbacks)), run_id=run_id)
+
+
+def _copy_graph_manager(
+    manager: _GraphCallbackManager | _AsyncGraphCallbackManager,
+    cls: type[_GraphManagerT],
+    run_id: UUID | None | object,
+) -> _GraphManagerT:
+    resolved_run_id: UUID | None
+    if run_id is _MISSING:
+        resolved_run_id = manager.run_id
+    else:
+        if run_id is not None and not isinstance(run_id, UUID):
+            raise TypeError("run_id must be a UUID or None")
+        resolved_run_id = run_id
+
+    return cls(
+        handlers=_filter_graph_handlers(manager.handlers),
+        inheritable_handlers=_filter_graph_handlers(manager.inheritable_handlers),
+        parent_run_id=manager.parent_run_id,
+        tags=manager.tags.copy(),
+        inheritable_tags=manager.inheritable_tags.copy(),
+        metadata=manager.metadata.copy(),
+        inheritable_metadata=manager.inheritable_metadata.copy(),
+        run_id=resolved_run_id,
+    )
+
+
+class _GraphCallbackManager(BaseCallbackManager):
+    """Sync dispatcher for graph lifecycle events."""
+
+    run_id: UUID | None
+
+    def __init__(
+        self,
+        handlers: Sequence[GraphCallbackHandler] | None = None,
+        inheritable_handlers: Sequence[GraphCallbackHandler] | None = None,
+        parent_run_id: UUID | None = None,
+        *,
+        tags: list[str] | None = None,
+        inheritable_tags: list[str] | None = None,
+        metadata: dict[str, Any] | None = None,
+        inheritable_metadata: dict[str, Any] | None = None,
+        run_id: UUID | None = None,
+    ) -> None:
+        _init_base_manager(
+            self,
+            handlers,
+            inheritable_handlers,
+            parent_run_id,
+            tags=tags,
+            inheritable_tags=inheritable_tags,
+            metadata=metadata,
+            inheritable_metadata=inheritable_metadata,
+            run_id=run_id,
+        )
+
+    def copy(
+        self,
+        *,
+        run_id: UUID | None | object = _MISSING,
+    ) -> _GraphCallbackManager:
+        return _copy_graph_manager(self, _GraphCallbackManager, run_id)
+
+    @classmethod
+    def configure(
+        cls,
+        callbacks: object | None = None,
+        *,
+        run_id: UUID | None = None,
+    ) -> _GraphCallbackManager:
+        return _configure_graph_callbacks(cls, callbacks, run_id=run_id)
+
+    def on_interrupt(self, event: GraphInterruptEvent) -> None:
+        handle_event(
+            self.handlers,
+            "on_interrupt",
+            None,
+            event,
+        )
+
+    def on_resume(self, event: GraphResumeEvent) -> None:
+        handle_event(
+            self.handlers,
+            "on_resume",
+            None,
+            event,
+        )
+
+
+class _AsyncGraphCallbackManager(BaseCallbackManager):
+    """Async dispatcher for graph lifecycle events."""
+
+    run_id: UUID | None
+
+    @property
+    def is_async(self) -> bool:
+        """Return whether the manager is async."""
+        return True
+
+    def __init__(
+        self,
+        handlers: Sequence[GraphCallbackHandler] | None = None,
+        inheritable_handlers: Sequence[GraphCallbackHandler] | None = None,
+        parent_run_id: UUID | None = None,
+        *,
+        tags: list[str] | None = None,
+        inheritable_tags: list[str] | None = None,
+        metadata: dict[str, Any] | None = None,
+        inheritable_metadata: dict[str, Any] | None = None,
+        run_id: UUID | None = None,
+    ) -> None:
+        _init_base_manager(
+            self,
+            handlers,
+            inheritable_handlers,
+            parent_run_id,
+            tags=tags,
+            inheritable_tags=inheritable_tags,
+            metadata=metadata,
+            inheritable_metadata=inheritable_metadata,
+            run_id=run_id,
+        )
+
+    def copy(
+        self,
+        *,
+        run_id: UUID | None | object = _MISSING,
+    ) -> _AsyncGraphCallbackManager:
+        return _copy_graph_manager(self, _AsyncGraphCallbackManager, run_id)
+
+    @classmethod
+    def configure(
+        cls,
+        callbacks: object | None = None,
+        *,
+        run_id: UUID | None = None,
+    ) -> _AsyncGraphCallbackManager:
+        return _configure_graph_callbacks(cls, callbacks, run_id=run_id)
+
+    async def on_interrupt(self, event: GraphInterruptEvent) -> None:
+        await ahandle_event(
+            self.handlers,
+            "on_interrupt",
+            None,
+            event,
+        )
+
+    async def on_resume(self, event: GraphResumeEvent) -> None:
+        await ahandle_event(
+            self.handlers,
+            "on_resume",
+            None,
+            event,
+        )
+
+
+_GraphManagerT = TypeVar(
+    "_GraphManagerT", _GraphCallbackManager, _AsyncGraphCallbackManager
+)
+
+GraphCallbacks: TypeAlias = (
+    _GraphCallbackManager
+    | _AsyncGraphCallbackManager
+    | BaseCallbackManager
+    | GraphCallbackHandler
+    | Sequence[BaseCallbackHandler]
+    | Sequence[GraphCallbackHandler]
+    | None
+)
+
+
+def get_sync_graph_callback_manager_for_config(
+    config: RunnableConfig,
+    *,
+    run_id: UUID | None = None,
+) -> _GraphCallbackManager:
+    """Build a sync graph lifecycle callback manager from a runnable config.
+
+    This helper filters `config["callbacks"]` down to handlers that inherit
+    from `GraphCallbackHandler` and binds the provided `run_id` onto the
+    returned manager.
+    """
+    return _GraphCallbackManager.configure(
+        config.get("callbacks"),
+        run_id=run_id,
+    )
+
+
+def get_async_graph_callback_manager_for_config(
+    config: RunnableConfig,
+    *,
+    run_id: UUID | None = None,
+) -> _AsyncGraphCallbackManager:
+    """Build an async graph lifecycle callback manager from a runnable config.
+
+    This helper filters `config["callbacks"]` down to handlers that inherit
+    from `GraphCallbackHandler` and binds the provided `run_id` onto the
+    returned manager.
+    """
+    return _AsyncGraphCallbackManager.configure(
+        config.get("callbacks"),
+        run_id=run_id,
+    )

libs/langgraph/langgraph/channels/__init__.py

@@ -1,6 +1,7 @@
 from langgraph.channels.any_value import AnyValue
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue, LastValueAfterFinish
 from langgraph.channels.named_barrier_value import (
@@ -20,6 +21,7 @@ __all__ = (
     "UntrackedValue",
     "EphemeralValue",
     "BinaryOperatorAggregate",
+    "DeltaChannel",
     "NamedBarrierValue",
     "NamedBarrierValueAfterFinish",
     # topics

libs/langgraph/langgraph/channels/binop.py

@@ -22,10 +22,9 @@ __all__ = ("BinaryOperatorAggregate",)
 def _strip_extras(t):  # type: ignore[no-untyped-def]
     """Strips Annotated, Required and NotRequired from a given type."""
     if hasattr(t, "__origin__"):
+        if t.__origin__ in (Required, NotRequired):
+            return _strip_extras(t.__args__[0])
         return _strip_extras(t.__origin__)
-    if hasattr(t, "__origin__") and t.__origin__ in (Required, NotRequired):
-        return _strip_extras(t.__args__[0])
-
     return t
 
 
@@ -33,11 +32,22 @@ def _get_overwrite(value: Any) -> tuple[bool, Any]:
     """Inspects the given value and returns (is_overwrite, overwrite_value)."""
     if isinstance(value, Overwrite):
         return True, value.value
-    if isinstance(value, dict) and set(value.keys()) == {OVERWRITE}:
+    if isinstance(value, dict) and len(value) == 1 and OVERWRITE in value:
         return True, value[OVERWRITE]
     return False, None
 
 
+def _operators_equal(a: Callable, b: Callable) -> bool:
+    """Return True if two reducer operators should be considered equal.
+
+    Lambdas all share the name '<lambda>' so identity comparison is
+    unreliable; treat any pairing that includes a lambda as equal.
+    """
+    if a.__name__ == "<lambda>" or b.__name__ == "<lambda>":
+        return True
+    return a is b
+
+
 class BinaryOperatorAggregate(Generic[Value], BaseChannel[Value, Value, Value]):
     """Stores the result of applying a binary operator to the current value and each new value.
 
@@ -68,11 +78,8 @@ class BinaryOperatorAggregate(Generic[Value], BaseChannel[Value, Value, Value]):
             self.value = MISSING
 
     def __eq__(self, value: object) -> bool:
-        return isinstance(value, BinaryOperatorAggregate) and (
-            value.operator is self.operator
-            if value.operator.__name__ != "<lambda>"
-            and self.operator.__name__ != "<lambda>"
-            else True
+        return isinstance(value, BinaryOperatorAggregate) and _operators_equal(
+            self.operator, value.operator
         )
 
     @property

libs/langgraph/langgraph/channels/delta.py

@@ -0,0 +1,197 @@
+from __future__ import annotations
+
+import collections.abc
+import copy as _copy
+from collections.abc import Callable, Sequence
+from typing import Any, Generic
+
+from langgraph.checkpoint.base import DELTA_SENTINEL, PendingWrite
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from typing_extensions import Self
+
+from langgraph._internal._typing import MISSING
+from langgraph.channels.base import BaseChannel, Value
+from langgraph.channels.binop import _get_overwrite, _operators_equal, _strip_extras
+from langgraph.errors import (
+    EmptyChannelError,
+    ErrorCode,
+    InvalidUpdateError,
+    create_error_message,
+)
+
+__all__ = ("DeltaChannel",)
+
+
+class DeltaChannel(Generic[Value], BaseChannel[Any, Any, Any]):
+    """Reducer channel that stores only a sentinel in checkpoint blobs and
+    reconstructs state by replaying ancestor writes through the reducer.
+
+    The reducer receives the current accumulated value and a batch of writes
+    in one call: `reducer(state, [write1, write2, ...]) -> new_state`.
+
+    Reducers must be deterministic and batching-invariant (associative across
+    folds): applying two consecutive write batches separately must produce the
+    same state as applying their concatenation once:
+
+        reducer(reducer(state, xs), ys) == reducer(state, xs + ys)
+
+    This lets LangGraph replay checkpointed writes in larger batches than they
+    were originally produced without changing reconstructed state.
+
+    `snapshot_frequency=None` (default): pure delta; stores only
+    `DELTA_SENTINEL` in checkpoint blobs; reads replay all ancestor writes.
+
+    `snapshot_frequency=N`: `create_checkpoint` writes a full `_DeltaSnapshot`
+    blob every N steps, bounding replay depth to N.
+
+    Parameters:
+        reducer: `(state, list[writes]) -> new_state`. Must be deterministic
+            and batching-invariant as described above.
+        typ: The value type (e.g. `list`, `dict`). Inferred automatically
+            from the outer type when used inside `Annotated[T, DeltaChannel(...)]`.
+        snapshot_frequency: Every Nth pregel step writes a snapshot blob.
+            `None` (default) = pure delta, never snapshot.
+    """
+
+    __slots__ = ("value", "reducer", "snapshot_frequency")
+    value: Value | Any
+
+    def __init__(
+        self,
+        reducer: Callable[[Any, Sequence[Any]], Any],
+        typ: type[Value] | None = None,
+        *,
+        snapshot_frequency: int | None = None,
+    ) -> None:
+        if typ is None:
+            typ = list  # type: ignore[assignment]  # placeholder; overridden by _is_field_channel
+        super().__init__(typ)
+        self.reducer = reducer
+        self.snapshot_frequency = snapshot_frequency
+        typ = _strip_extras(typ)
+        if typ in (collections.abc.Sequence, collections.abc.MutableSequence):
+            typ = list
+        if typ in (collections.abc.Set, collections.abc.MutableSet):
+            typ = set
+        if typ in (collections.abc.Mapping, collections.abc.MutableMapping):
+            typ = dict
+        self.typ = typ
+        self.value: Any = MISSING
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, DeltaChannel):
+            return False
+        if self.snapshot_frequency != other.snapshot_frequency:
+            return False
+        return _operators_equal(self.reducer, other.reducer)
+
+    @property
+    def ValueType(self) -> Any:
+        return self.typ
+
+    @property
+    def UpdateType(self) -> Any:
+        return self.typ
+
+    def is_snapshot_step(self, step: int) -> bool:
+        """True if pregel should write a snapshot blob at this step."""
+        return (
+            self.snapshot_frequency is not None
+            and step > 0
+            and step % self.snapshot_frequency == 0
+        )
+
+    def copy(self) -> Self:
+        new = self.__class__(
+            self.reducer, self.typ, snapshot_frequency=self.snapshot_frequency
+        )
+        new.key = self.key
+        new.value = self.value if self.value is MISSING else _copy.copy(self.value)
+        return new
+
+    def from_checkpoint(self, checkpoint: Any) -> Self:
+        """Initialize from a stored blob or sentinel.
+
+        Blob types (dispatched via serde ext code, not dict key inspection):
+          * `DELTA_SENTINEL` / `MISSING`: start empty; caller replays writes.
+          * `_DeltaSnapshot(value)`: restore value directly from snapshot.
+          * plain value (migration from old BinOp blobs): use directly.
+        """
+        new = self.__class__(
+            self.reducer, self.typ, snapshot_frequency=self.snapshot_frequency
+        )
+        new.key = self.key
+        if checkpoint is MISSING or checkpoint is DELTA_SENTINEL:
+            new.value = self.typ()
+        elif isinstance(checkpoint, _DeltaSnapshot):
+            new.value = checkpoint.value
+        else:
+            new.value = checkpoint
+        return new
+
+    def replay_writes(self, writes: Sequence[PendingWrite]) -> None:
+        """Apply ancestor writes oldest-to-newest via a single reducer call.
+
+        If any write is an Overwrite, the last one in the sequence acts as
+        the reset point: its value becomes the new base and only writes
+        after it are passed to the reducer.
+        """
+        values = [v for _, _, v in writes]
+        if not values:
+            return
+        base = self.value
+        start = 0
+        for i, v in enumerate(values):
+            is_ow, ow_value = _get_overwrite(v)
+            if is_ow:
+                base = _copy.copy(ow_value) if ow_value is not None else self.typ()
+                start = i + 1
+        remaining = values[start:]
+        self.value = self.reducer(base, remaining) if remaining else base
+
+    def update(self, values: Sequence[Any]) -> bool:
+        if not values:
+            return False
+        overwrite_idx: int | None = None
+        for i, v in enumerate(values):
+            is_ow, _ = _get_overwrite(v)
+            if is_ow:
+                if overwrite_idx is not None:
+                    msg = create_error_message(
+                        message="Can receive only one Overwrite value per super-step.",
+                        error_code=ErrorCode.INVALID_CONCURRENT_GRAPH_UPDATE,
+                    )
+                    raise InvalidUpdateError(msg)
+                overwrite_idx = i
+        if overwrite_idx is not None:
+            _, overwrite_value = _get_overwrite(values[overwrite_idx])
+            base = (
+                _copy.copy(overwrite_value)
+                if overwrite_value is not None
+                else self.typ()
+            )
+            remaining = [v for i, v in enumerate(values) if i != overwrite_idx]
+            self.value = self.reducer(base, remaining) if remaining else base
+            return True
+        base = self.typ() if self.value is MISSING else self.value
+        self.value = self.reducer(base, list(values))
+        return True
+
+    def get(self) -> Any:
+        if self.value is MISSING:
+            raise EmptyChannelError()
+        return self.value
+
+    def is_available(self) -> bool:
+        return self.value is not MISSING
+
+    def checkpoint(self) -> Any:
+        """Return stored representation: always `DELTA_SENTINEL`.
+
+        Snapshot decisions are made by `create_checkpoint` in pregel (which
+        has the step number) via `is_snapshot_step`. `checkpoint()` is only
+        called for non-snapshot steps or when no checkpointer is available.
+        """
+        if self.value is MISSING:
+            return MISSING
+        return DELTA_SENTINEL

libs/langgraph/langgraph/graph/message.py

@@ -244,6 +244,52 @@ def add_messages(
     return merged
 
 
+def _messages_delta_reducer(
+    state: list[AnyMessage], writes: list[list[AnyMessage]]
+) -> list[AnyMessage]:
+    """**Experimental.** Batch reducer for use with `DeltaChannel`.
+
+    Processes all writes in one pass — dedup by ID, `RemoveMessage`
+    tombstoning — without calling `add_messages`. Assumes writes contain
+    already-typed `BaseMessage` objects (no raw-dict coercion).
+
+    This reducer is batching-invariant, as required by `DeltaChannel`:
+    `reducer(reducer(state, xs), ys) == reducer(state, xs + ys)`.
+
+    Use `add_messages` as the reducer for `BinaryOperatorAggregate` or
+    anywhere raw message dicts / strings need to be coerced first.
+
+    Example::
+
+        from typing import Annotated
+        from langgraph.channels.delta import DeltaChannel
+        from langgraph.graph.message import _messages_delta_reducer
+
+        class State(TypedDict):
+            messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+    """
+    from itertools import chain
+
+    index: dict[str, int] = {m.id: i for i, m in enumerate(state) if m.id is not None}
+    result: list[AnyMessage | None] = list(state)
+    for msg in chain.from_iterable(
+        [w] if isinstance(w, BaseMessage) else w for w in writes
+    ):
+        mid = msg.id
+        if mid is None:
+            result.append(msg)
+        elif isinstance(msg, RemoveMessage):
+            if mid in index:
+                result[index[mid]] = None
+                del index[mid]
+        elif mid in index:
+            result[index[mid]] = msg
+        else:
+            index[mid] = len(result)
+            result.append(msg)
+    return [m for m in result if m is not None]
+
+
 @deprecated(
     "MessageGraph is deprecated in langgraph 1.0.0, to be removed in 2.0.0. Please use StateGraph with a `messages` key instead.",
     category=None,

libs/langgraph/langgraph/graph/state.py

@@ -48,6 +48,7 @@ from langgraph._internal._runnable import coerce_to_runnable
 from langgraph._internal._typing import EMPTY_SEQ, MISSING, DeprecatedKwargs
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue, LastValueAfterFinish
 from langgraph.channels.named_barrier_value import (
@@ -1082,6 +1083,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             CompiledStateGraph: The compiled `StateGraph`.
         """
         checkpointer = ensure_valid_checkpointer(checkpointer)
+
         serde_allowlist: set[tuple[str, ...]] | None = None
         if _serde.STRICT_MSGPACK_ENABLED:
             schema_types: list[type[Any]] = [
@@ -1667,6 +1669,20 @@ def _is_field_channel(typ: type[Any]) -> BaseChannel | None:
         # Search through all annotated medata to find channel annotations
         for item in meta:
             if isinstance(item, BaseChannel):
+                if isinstance(item, DeltaChannel) and hasattr(typ, "__origin__"):
+                    origin = typ.__origin__
+                    # Unwrap parameterized Required[X]/NotRequired[X] to X
+                    # (e.g. Annotated[NotRequired[dict[...]], ...]).
+                    if hasattr(origin, "__origin__") and origin.__origin__ in (
+                        Required,
+                        NotRequired,
+                    ):
+                        origin = origin.__args__[0]
+                    item = item.__class__(
+                        item.reducer,
+                        origin,
+                        snapshot_frequency=item.snapshot_frequency,
+                    )
                 return item
             elif isclass(item) and issubclass(item, BaseChannel):
                 # ex, Annotated[int, EphemeralValue, SomeOtherAnnotation]

libs/langgraph/langgraph/pregel/_checkpoint.py

@@ -1,17 +1,23 @@
 from __future__ import annotations
 
-from collections.abc import Mapping
+from collections.abc import Callable, Mapping
 from datetime import datetime, timezone
+from typing import Any, cast
 
-from langgraph.checkpoint.base import Checkpoint
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import DELTA_SENTINEL, BaseCheckpointSaver, Checkpoint
 from langgraph.checkpoint.base.id import uuid6
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 
 from langgraph._internal._typing import MISSING
 from langgraph.channels.base import BaseChannel
+from langgraph.channels.delta import DeltaChannel
 from langgraph.managed.base import ManagedValueMapping, ManagedValueSpec
 
 LATEST_VERSION = 4
 
+GetNextVersion = Callable[[Any, None], Any]
+
 
 def empty_checkpoint() -> Checkpoint:
     return Checkpoint(
@@ -31,35 +37,87 @@ def create_checkpoint(
     *,
     id: str | None = None,
     updated_channels: set[str] | None = None,
+    get_next_version: GetNextVersion | None = None,
+    force_delta_snapshot: bool = False,
 ) -> Checkpoint:
-    """Create a checkpoint for the given channels."""
+    """Create a checkpoint for the given channels.
+
+    For `DeltaChannel` with `snapshot_frequency=N`, snapshot steps write a
+    `_DeltaSnapshot` blob rather than `DELTA_SENTINEL`, bounding the ancestor
+    walk to at most N steps. Snapshots are eager: even if the channel had no
+    write this step, a version bump is forced (via `get_next_version`) so the
+    blob is stored by `put()`. Without `get_next_version` (e.g. static
+    contexts), snapshot steps gracefully fall back to sentinel.
+
+    `force_delta_snapshot` writes available `DeltaChannel` values as snapshots
+    regardless of `snapshot_frequency`. This is used by `durability="exit"`,
+    where intermediate writes are not stored as ancestor `checkpoint_writes`.
+    """
     ts = datetime.now(timezone.utc).isoformat()
     if channels is None:
         values = checkpoint["channel_values"]
+        channel_versions = checkpoint["channel_versions"]
     else:
         values = {}
+        channel_versions = dict(checkpoint["channel_versions"])
         for k in channels:
-            if k not in checkpoint["channel_versions"]:
+            if k not in channel_versions:
                 continue
-            v = channels[k].checkpoint()
-            if v is not MISSING:
-                values[k] = v
+            ch = channels[k]
+            if (
+                isinstance(ch, DeltaChannel)
+                and (force_delta_snapshot or ch.is_snapshot_step(step))
+                and ch.is_available()
+            ):
+                # Eager snapshot: bump version if not already written this step
+                # so put() includes this channel in new_versions and stores blob.
+                if get_next_version is not None and (
+                    updated_channels is None or k not in updated_channels
+                ):
+                    channel_versions[k] = get_next_version(channel_versions[k], None)
+                values[k] = _DeltaSnapshot(ch.get())
+            else:
+                v = ch.checkpoint()
+                if v is not MISSING:
+                    values[k] = v
     return Checkpoint(
         v=LATEST_VERSION,
         ts=ts,
         id=id or str(uuid6(clock_seq=step)),
         channel_values=values,
-        channel_versions=checkpoint["channel_versions"],
+        channel_versions=channel_versions,
         versions_seen=checkpoint["versions_seen"],
         updated_channels=None if updated_channels is None else sorted(updated_channels),
     )
 
 
+def _needs_replay(spec: BaseChannel, stored: object) -> bool:
+    """True if `spec` is a `DeltaChannel` and the stored blob is a sentinel,
+    requiring an ancestor walk to reconstruct.
+
+    `_DeltaSnapshot` blobs and plain values (migration) resolve directly via
+    `from_checkpoint` — only `DELTA_SENTINEL` / `MISSING` trigger replay.
+    """
+    if not isinstance(spec, DeltaChannel):
+        return False
+    return stored is MISSING or stored is DELTA_SENTINEL
+
+
 def channels_from_checkpoint(
     specs: Mapping[str, BaseChannel | ManagedValueSpec],
     checkpoint: Checkpoint,
+    *,
+    saver: BaseCheckpointSaver | None = None,
+    config: RunnableConfig | None = None,
 ) -> tuple[Mapping[str, BaseChannel], ManagedValueMapping]:
-    """Get channels from a checkpoint."""
+    """Hydrate channels from a checkpoint.
+
+    For most channels, `spec.from_checkpoint(checkpoint["channel_values"][k])`
+    is sufficient. `DeltaChannel` is the exception: sentinel blobs require an
+    ancestor walk via `saver._get_channel_writes_history`. The walk terminates
+    at the nearest `_DeltaSnapshot` blob (step-based) or a pre-migration plain
+    value, so read depth is bounded by `snapshot_frequency`.
+    """
     channel_specs: dict[str, BaseChannel] = {}
     managed_specs: dict[str, ManagedValueSpec] = {}
     for k, v in specs.items():
@@ -67,13 +125,53 @@ def channels_from_checkpoint(
             channel_specs[k] = v
         else:
             managed_specs[k] = v
-    return (
-        {
-            k: v.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
-            for k, v in channel_specs.items()
-        },
-        managed_specs,
-    )
+
+    channels: dict[str, BaseChannel] = {}
+    for k, spec in channel_specs.items():
+        ch: BaseChannel
+        stored = checkpoint["channel_values"].get(k, MISSING)
+        if _needs_replay(spec, stored) and saver is not None and config is not None:
+            delta_spec = cast(DeltaChannel, spec)
+            history = saver._get_channel_writes_history(config, k)
+            replay_ch = delta_spec.from_checkpoint(history.seed)
+            replay_ch.replay_writes(history.writes)
+            ch = replay_ch
+        else:
+            ch = spec.from_checkpoint(stored)
+        channels[k] = ch
+    return channels, managed_specs
+
+
+async def achannels_from_checkpoint(
+    specs: Mapping[str, BaseChannel | ManagedValueSpec],
+    checkpoint: Checkpoint,
+    *,
+    saver: BaseCheckpointSaver | None = None,
+    config: RunnableConfig | None = None,
+) -> tuple[Mapping[str, BaseChannel], ManagedValueMapping]:
+    """Async version of `channels_from_checkpoint`. See docstring there."""
+    channel_specs: dict[str, BaseChannel] = {}
+    managed_specs: dict[str, ManagedValueSpec] = {}
+    for k, v in specs.items():
+        if isinstance(v, BaseChannel):
+            channel_specs[k] = v
+        else:
+            managed_specs[k] = v
+
+    channels: dict[str, BaseChannel] = {}
+    for k, spec in channel_specs.items():
+        ch: BaseChannel
+        stored = checkpoint["channel_values"].get(k, MISSING)
+        if _needs_replay(spec, stored) and saver is not None and config is not None:
+            delta_spec = cast(DeltaChannel, spec)
+            history = await saver._aget_channel_writes_history(config, k)
+            replay_ch = delta_spec.from_checkpoint(history.seed)
+            replay_ch.replay_writes(history.writes)
+            ch = replay_ch
+        else:
+            ch = spec.from_checkpoint(stored)
+        channels[k] = ch
+    return channels, managed_specs
 
 
 def copy_checkpoint(checkpoint: Checkpoint) -> Checkpoint:

libs/langgraph/langgraph/pregel/_loop.py

@@ -62,7 +62,13 @@ from langgraph._internal._constants import (
 from langgraph._internal._replay import ReplayState
 from langgraph._internal._scratchpad import PregelScratchpad
 from langgraph._internal._typing import EMPTY_SEQ, MISSING
+from langgraph.callbacks import (
+    GraphInterruptEvent,
+    GraphLifecycleEvent,
+    GraphResumeEvent,
+)
 from langgraph.channels.base import BaseChannel
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.constants import TAG_HIDDEN
 from langgraph.errors import (
@@ -87,6 +93,7 @@ from langgraph.pregel._algo import (
     task_path_str,
 )
 from langgraph.pregel._checkpoint import (
+    achannels_from_checkpoint,
     channels_from_checkpoint,
     copy_checkpoint,
     create_checkpoint,
@@ -117,6 +124,7 @@ from langgraph.types import (
     CachePolicy,
     Command,
     Durability,
+    Interrupt,
     PregelExecutableTask,
     RetryPolicy,
     Send,
@@ -182,6 +190,8 @@ class PregelLoop:
     _migrate_checkpoint: Callable[[Checkpoint], None] | None
     submit: Submit
     channels: Mapping[str, BaseChannel]
+    # Only set on AsyncPregelLoop; sync loops keep this as None.
+    _delta_write_futs: list[Any] | None = None
     managed: ManagedValueMapping
     checkpoint: Checkpoint
     checkpoint_id_saved: str
@@ -203,6 +213,8 @@ class PregelLoop:
     tasks: dict[str, PregelExecutableTask]
     output: None | dict[str, Any] | Any = None
     updated_channels: set[str] | None = None
+    _graph_lifecycle_events: deque[GraphLifecycleEvent]
+    _has_graph_lifecycle_callbacks: bool
 
     # public
 
@@ -228,6 +240,7 @@ class PregelLoop:
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
         cache_policy: CachePolicy | None = None,
+        has_graph_lifecycle_callbacks: bool = False,
     ) -> None:
         self.stream = stream
         self.config = config
@@ -252,6 +265,8 @@ class PregelLoop:
         self.retry_policy = retry_policy
         self.cache_policy = cache_policy
         self.durability = durability
+        self._has_graph_lifecycle_callbacks = has_graph_lifecycle_callbacks
+        self._graph_lifecycle_events = deque()
         if self.stream is not None and CONFIG_KEY_STREAM in config[CONF]:
             self.stream = DuplexStream(self.stream, config[CONF][CONFIG_KEY_STREAM])
         scratchpad: PregelScratchpad | None = config[CONF].get(CONFIG_KEY_SCRATCHPAD)
@@ -303,6 +318,40 @@ class PregelLoop:
         )
         self.prev_checkpoint_config = None
 
+    def _push_graph_lifecycle_event(
+        self,
+        kind: Literal["resume", "interrupt"],
+        *,
+        interrupts: tuple[Interrupt, ...] = (),
+    ) -> None:
+        if kind == "resume":
+            self._graph_lifecycle_events.append(
+                GraphResumeEvent(
+                    run_id=None,
+                    status=self.status,
+                    checkpoint_id=self.checkpoint["id"],
+                    checkpoint_ns=self.checkpoint_ns,
+                )
+            )
+        elif kind == "interrupt":
+            self._graph_lifecycle_events.append(
+                GraphInterruptEvent(
+                    run_id=None,
+                    status=self.status,
+                    checkpoint_id=self.checkpoint["id"],
+                    checkpoint_ns=self.checkpoint_ns,
+                    interrupts=interrupts,
+                )
+            )
+        else:
+            msg = f"Unknown graph lifecycle event type: {kind}"
+            raise AssertionError(msg)
+
+    def _pop_lifecycle_event(self) -> GraphLifecycleEvent | None:
+        if not self._graph_lifecycle_events:
+            return None
+        return self._graph_lifecycle_events.popleft()
+
     def put_writes(self, task_id: str, writes: WritesT) -> None:
         """Put writes for a task, to be read by the next tick."""
         if not writes:
@@ -361,7 +410,7 @@ class PregelLoop:
                     task = self.tasks.get(task_id)
                 else:
                     task = None
-                self.submit(
+                fut = self.submit(
                     self.checkpointer_put_writes,
                     config,
                     writes_to_save,
@@ -369,12 +418,16 @@ class PregelLoop:
                     task_path_str(task.path) if task else "",
                 )
             else:
-                self.submit(
+                fut = self.submit(
                     self.checkpointer_put_writes,
                     config,
                     writes_to_save,
                     task_id,
                 )
+            if self._delta_write_futs is not None and any(
+                isinstance(self.specs.get(c), DeltaChannel) for c, _ in writes_to_save
+            ):
+                self._delta_write_futs.append(fut)
         # output writes
         if hasattr(self, "tasks"):
             self.output_writes(task_id, writes)
@@ -647,7 +700,7 @@ class PregelLoop:
         # writes so that interrupt() calls re-fire instead of returning
         # stale values. But if we're actively resuming, keep them —
         # multi-interrupt scenarios need previously resolved values preserved.
-        if self.is_replaying and (
+        is_time_traveling = self.is_replaying and (
             # Time-travel to a subgraph checkpoint: the parent sets
             # RESUMING=True (it can't distinguish time-travel from resume),
             # so we check if this subgraph's own ns is in checkpoint_map.
@@ -665,7 +718,8 @@ class PregelLoop:
                 # (subgraph input is a Send arg, not a Command)
                 or configurable.get(CONFIG_KEY_RESUMING, False)
             )
-        ):
+        )
+        if is_time_traveling:
             self.checkpoint_pending_writes = [
                 w for w in self.checkpoint_pending_writes if w[1] != RESUME
             ]
@@ -720,6 +774,26 @@ class PregelLoop:
                 if k in self.checkpoint["channel_versions"]:
                     version = self.checkpoint["channel_versions"][k]
                     self.checkpoint["versions_seen"][INTERRUPT][k] = version
+            # When time-traveling (replaying from a specific checkpoint),
+            # save a fork checkpoint so the replayed execution creates a
+            # new branch. Without this, if the execution hits an interrupt
+            # before after_tick() runs, no new checkpoint is created —
+            # the parent's latest checkpoint remains the old one and
+            # subsequent resumes load the wrong state.
+            # Skip for update_state forks (source=update/fork) since they
+            # already have their own fork checkpoint.
+            if is_time_traveling and self.checkpoint_metadata.get("source") not in (
+                "update",
+                "fork",
+            ):
+                # Clear old INTERRUPT writes from the loaded checkpoint.
+                # The fork will have a new checkpoint_id which changes
+                # task IDs — stale interrupt writes would accumulate and
+                # confuse the multiple-interrupt check in future resumes.
+                self.checkpoint_pending_writes = [
+                    w for w in self.checkpoint_pending_writes if w[1] != INTERRUPT
+                ]
+                self._put_checkpoint({"source": "fork"})
             # produce values output
             self._emit(
                 "values", map_output_values, self.output_keys, True, self.channels
@@ -762,14 +836,28 @@ class PregelLoop:
         if not self.is_nested:
             # Pass the resolved before-bound checkpoint ID so subgraphs can
             # find their corresponding checkpoint without re-fetching the
-            # parent. For forks (source=update), use the fork's parent
+            # parent. For forks (source=update/fork), use the fork's parent
             # checkpoint ID since the fork was created after the subgraph's
             # checkpoints from the original execution.
+            #
+            # Only gate on is_time_traveling (not is_replaying). When the
+            # client resumes with an explicit checkpoint_id that happens to
+            # point at the current head (e.g. LangGraph Studio sending
+            # `checkpoint: {checkpoint_id}` alongside Command(resume=...)),
+            # is_replaying is True but is_time_traveling is False. In that
+            # case subgraphs should load their latest checkpoint normally,
+            # not go through ReplayState's before-bound lookup which would
+            # miss subgraph checkpoints created during processing of the
+            # current parent step.
             replay_state: ReplayState | None = None
-            if self.is_replaying:
+            if is_time_traveling:
                 replay_checkpoint_id = self.checkpoint["id"]
                 if (
-                    self.checkpoint_metadata.get("source") == "update"
+                    self.checkpoint_metadata.get("source")
+                    in (
+                        "update",
+                        "fork",
+                    )
                     and self.prev_checkpoint_config
                 ):
                     replay_checkpoint_id = self.prev_checkpoint_config[CONF].get(
@@ -785,6 +873,8 @@ class PregelLoop:
             )
         # set flag
         self.status = "pending"
+        if is_resuming:
+            self._push_graph_lifecycle_event("resume")
         return updated_channels
 
     def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
@@ -808,6 +898,10 @@ class PregelLoop:
             self.step,
             id=self.checkpoint["id"] if exiting else None,
             updated_channels=self.updated_channels,
+            get_next_version=self.checkpointer_get_next_version
+            if do_checkpoint
+            else None,
+            force_delta_snapshot=exiting and self.durability == "exit",
         )
         # sanitize TASK channel in the checkpoint before saving (durability=="exit")
         if TASKS in self.checkpoint["channel_values"] and any(
@@ -885,8 +979,10 @@ class PregelLoop:
             self._put_checkpoint(self.checkpoint_metadata)
             self._put_pending_writes()
         # suppress interrupt
-        suppress = isinstance(exc_value, GraphInterrupt) and not self.is_nested
-        if suppress:
+        if isinstance(exc_value, GraphInterrupt) and not self.is_nested:
+            interrupt = exc_value
+            interrupts = tuple(interrupt.args[0]) if interrupt.args else ()
+            self._push_graph_lifecycle_event("interrupt", interrupts=interrupts)
             # emit one last "values" event, with pending writes applied
             if (
                 hasattr(self, "tasks")
@@ -913,12 +1009,11 @@ class PregelLoop:
                         self.channels,
                     )
             # emit INTERRUPT if exception is empty (otherwise emitted by put_writes)
-            if exc_value is not None and (not exc_value.args or not exc_value.args[0]):
+            if not interrupt.args or not interrupt.args[0]:
+                interrupt_payload = interrupt.args[0] if interrupt.args else ()
                 self._emit(
                     "updates",
-                    lambda: iter(
-                        [{INTERRUPT: cast(GraphInterrupt, exc_value).args[0]}]
-                    ),
+                    lambda: iter([{INTERRUPT: interrupt_payload}]),
                 )
             # save final output
             self.output = read_channels(self.channels, self.output_keys)
@@ -1040,6 +1135,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
         cache_policy: CachePolicy | None = None,
+        has_graph_lifecycle_callbacks: bool = False,
     ) -> None:
         super().__init__(
             input,
@@ -1061,6 +1157,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
             retry_policy=retry_policy,
             cache_policy=cache_policy,
             durability=durability,
+            has_graph_lifecycle_callbacks=has_graph_lifecycle_callbacks,
         )
         self.stack = ExitStack()
         if checkpointer:
@@ -1136,6 +1233,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
     # context manager
 
     def __enter__(self) -> Self:
+        self._graph_lifecycle_events = deque()
         if not self.checkpointer:
             saved = None
         elif self.checkpoint_config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
@@ -1187,7 +1285,10 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
         )
         self.submit = self.stack.enter_context(BackgroundExecutor(self.config))
         self.channels, self.managed = channels_from_checkpoint(
-            self.specs, self.checkpoint
+            self.specs,
+            self.checkpoint,
+            saver=self.checkpointer,
+            config=self.checkpoint_config,
         )
         self.stack.push(self._suppress_interrupt)
         self.status = "input"
@@ -1236,6 +1337,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
         cache_policy: CachePolicy | None = None,
+        has_graph_lifecycle_callbacks: bool = False,
     ) -> None:
         super().__init__(
             input,
@@ -1257,6 +1359,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             retry_policy=retry_policy,
             cache_policy=cache_policy,
             durability=durability,
+            has_graph_lifecycle_callbacks=has_graph_lifecycle_callbacks,
         )
         self.stack = AsyncExitStack()
         if checkpointer:
@@ -1280,6 +1383,11 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
         metadata: CheckpointMetadata,
         new_versions: ChannelVersions,
     ) -> RunnableConfig:
+        # Drain DeltaChannel write futures before committing the checkpoint so
+        # DELTA_SENTINEL blobs are never saved ahead of their backing writes.
+        if self._delta_write_futs:
+            futs, self._delta_write_futs = self._delta_write_futs, []
+            await asyncio.gather(*futs)
         try:
             if prev is not None:
                 await prev
@@ -1335,6 +1443,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
     # context manager
 
     async def __aenter__(self) -> Self:
+        self._graph_lifecycle_events = deque()
         if not self.checkpointer:
             saved = None
         elif self.checkpoint_config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
@@ -1384,11 +1493,15 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             if saved.pending_writes is not None
             else []
         )
+        self._delta_write_futs = []
         self.submit = await self.stack.enter_async_context(
             AsyncBackgroundExecutor(self.config)
         )
-        self.channels, self.managed = channels_from_checkpoint(
-            self.specs, self.checkpoint
+        self.channels, self.managed = await achannels_from_checkpoint(
+            self.specs,
+            self.checkpoint,
+            saver=self.checkpointer,
+            config=self.checkpoint_config,
         )
         self.stack.push(self._suppress_interrupt)
         self.status = "input"

libs/langgraph/langgraph/pregel/main.py

@@ -16,7 +16,7 @@ from collections.abc import (
     Mapping,
     Sequence,
 )
-from dataclasses import is_dataclass
+from dataclasses import is_dataclass, replace
 from functools import partial
 from inspect import isclass
 from typing import (
@@ -96,6 +96,12 @@ from langgraph._internal._runnable import (
     coerce_to_runnable,
 )
 from langgraph._internal._typing import MISSING, DeprecatedKwargs
+from langgraph.callbacks import (
+    GraphInterruptEvent,
+    GraphResumeEvent,
+    get_async_graph_callback_manager_for_config,
+    get_sync_graph_callback_manager_for_config,
+)
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.topic import Topic
 from langgraph.config import get_config
@@ -116,6 +122,7 @@ from langgraph.pregel._algo import (
 )
 from langgraph.pregel._call import identifier
 from langgraph.pregel._checkpoint import (
+    achannels_from_checkpoint,
     channels_from_checkpoint,
     copy_checkpoint,
     create_checkpoint,
@@ -1046,6 +1053,10 @@ class Pregel(
         channels, managed = channels_from_checkpoint(
             self.channels,
             saved.checkpoint,
+            saver=self.checkpointer
+            if isinstance(self.checkpointer, BaseCheckpointSaver)
+            else None,
+            config=saved.config,
         )
         # tasks for this checkpoint
         next_tasks = prepare_next_tasks(
@@ -1162,9 +1173,13 @@ class Pregel(
 
         step = saved.metadata.get("step", -1) + 1
         stop = step + 2
-        channels, managed = channels_from_checkpoint(
+        channels, managed = await achannels_from_checkpoint(
             self.channels,
             saved.checkpoint,
+            saver=self.checkpointer
+            if isinstance(self.checkpointer, BaseCheckpointSaver)
+            else None,
+            config=saved.config,
         )
         # tasks for this checkpoint
         next_tasks = prepare_next_tasks(
@@ -1535,6 +1550,11 @@ class Pregel(
             channels, managed = channels_from_checkpoint(
                 self.channels,
                 checkpoint,
+                saver=self.checkpointer
+                if saved is not None
+                and isinstance(self.checkpointer, BaseCheckpointSaver)
+                else None,
+                config=saved.config if saved is not None else None,
             )
             values, as_node = updates[0][:2]
 
@@ -1978,9 +1998,14 @@ class Pregel(
             )
             if saved:
                 checkpoint_config = patch_configurable(config, saved.config[CONF])
-            channels, managed = channels_from_checkpoint(
+            channels, managed = await achannels_from_checkpoint(
                 self.channels,
                 checkpoint,
+                saver=self.checkpointer
+                if saved is not None
+                and isinstance(self.checkpointer, BaseCheckpointSaver)
+                else None,
+                config=saved.config if saved is not None else None,
             )
             values, as_node = updates[0][:2]
             # no values, just clear all tasks
@@ -2585,6 +2610,10 @@ class Pregel(
             name=config.get("run_name", self.get_name()),
             run_id=config.get("run_id"),
         )
+        graph_callback_manager = get_sync_graph_callback_manager_for_config(
+            config,
+            run_id=run_manager.run_id,
+        )
         try:
             # assign defaults
             (
@@ -2669,6 +2698,17 @@ class Pregel(
             _output_mapper = self._output_mapper if version == "v2" else None
             _state_mapper = self._state_mapper if version == "v2" else None
 
+            def emit_graph_lifecycle_events(loop: SyncPregelLoop) -> None:
+                while (event := loop._pop_lifecycle_event()) is not None:
+                    if isinstance(event, GraphResumeEvent):
+                        graph_callback_manager.on_resume(
+                            replace(event, run_id=graph_callback_manager.run_id)
+                        )
+                    else:
+                        graph_callback_manager.on_interrupt(
+                            replace(event, run_id=graph_callback_manager.run_id)
+                        )
+
             with SyncPregelLoop(
                 input,
                 stream=StreamProtocol(stream.put, stream_modes),
@@ -2689,7 +2729,9 @@ class Pregel(
                 migrate_checkpoint=self._migrate_checkpoint,
                 retry_policy=self.retry_policy,
                 cache_policy=self.cache_policy,
+                has_graph_lifecycle_callbacks=bool(graph_callback_manager.handlers),
             ) as loop:
+                emit_graph_lifecycle_events(loop)
                 # create runner
                 runner = PregelRunner(
                     submit=config[CONF].get(
@@ -2751,9 +2793,11 @@ class Pregel(
                             _state_mapper,
                         )
                     loop.after_tick()
+                    emit_graph_lifecycle_events(loop)
                     # wait for checkpoint
                     if durability_ == "sync":
                         loop._put_checkpoint_fut.result()
+            emit_graph_lifecycle_events(loop)
             # emit output
             yield from _output(
                 stream_mode,
@@ -2928,6 +2972,10 @@ class Pregel(
             name=config.get("run_name", self.get_name()),
             run_id=config.get("run_id"),
         )
+        graph_callback_manager = get_async_graph_callback_manager_for_config(
+            config,
+            run_id=run_manager.run_id,
+        )
         # if running from astream_log() run each proc with streaming
         do_stream = (
             next(
@@ -3042,6 +3090,28 @@ class Pregel(
             _output_mapper = self._output_mapper if version == "v2" else None
             _state_mapper = self._state_mapper if version == "v2" else None
 
+            async def aemit_graph_lifecycle_events(loop: AsyncPregelLoop) -> None:
+                while (event := loop._pop_lifecycle_event()) is not None:
+                    if isinstance(event, GraphResumeEvent):
+                        await graph_callback_manager.on_resume(
+                            GraphResumeEvent(
+                                run_id=graph_callback_manager.run_id,
+                                status=event.status,
+                                checkpoint_id=event.checkpoint_id,
+                                checkpoint_ns=event.checkpoint_ns,
+                            )
+                        )
+                    else:
+                        await graph_callback_manager.on_interrupt(
+                            GraphInterruptEvent(
+                                run_id=graph_callback_manager.run_id,
+                                status=event.status,
+                                checkpoint_id=event.checkpoint_id,
+                                checkpoint_ns=event.checkpoint_ns,
+                                interrupts=event.interrupts,
+                            )
+                        )
+
             async with AsyncPregelLoop(
                 input,
                 stream=StreamProtocol(stream.put_nowait, stream_modes),
@@ -3062,7 +3132,9 @@ class Pregel(
                 migrate_checkpoint=self._migrate_checkpoint,
                 retry_policy=self.retry_policy,
                 cache_policy=self.cache_policy,
+                has_graph_lifecycle_callbacks=bool(graph_callback_manager.handlers),
             ) as loop:
+                await aemit_graph_lifecycle_events(loop)
                 # create runner
                 runner = PregelRunner(
                     submit=config[CONF].get(
@@ -3144,6 +3216,7 @@ class Pregel(
                             ):
                                 yield o
                         loop.after_tick()
+                        await aemit_graph_lifecycle_events(loop)
                         # wait for checkpoint
                         if durability_ == "sync":
                             await cast(asyncio.Future, loop._put_checkpoint_fut)
@@ -3152,6 +3225,8 @@ class Pregel(
                     if _cleanup_waiter is not None:
                         await _cleanup_waiter()
 
+            await aemit_graph_lifecycle_events(loop)
+
             # emit output
             for o in _output(
                 stream_mode,
@@ -3659,15 +3734,14 @@ def _coerce_checkpoint_values(payload: Any, mapper: Callable[[Any], Any]) -> Non
 def _build_server_info(
     config: RunnableConfig, parent_runtime: Runtime[Any]
 ) -> ServerInfo | None:
-    """Build ServerInfo from config metadata and configurable.
+    """Build ServerInfo from config configurable.
 
-    The server puts assistant_id/graph_id in config metadata and the
+    The server puts assistant_id/graph_id in config configurable and the
     authenticated user dict in configurable["langgraph_auth_user"].
     """
-    metadata = config.get("metadata") or {}
     configurable = config.get(CONF) or {}
-    assistant_id = metadata.get("assistant_id")
-    graph_id = metadata.get("graph_id")
+    assistant_id = configurable.get("assistant_id")
+    graph_id = configurable.get("graph_id")
 
     # Read authenticated user from configurable (set by LangGraph Server).
     # We prefer isinstance(BaseUser) but fall back to hasattr("identity")

libs/langgraph/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph"
-version = "1.1.6"
+version = "1.2.0a2"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -24,8 +24,8 @@ classifiers = [
     'Programming Language :: Python :: 3.13',
 ]
 dependencies = [
-    "langchain-core>=0.1",
-    "langgraph-checkpoint>=2.1.0,<5.0.0",
+    "langchain-core>=1.3.2,<2",
+    "langgraph-checkpoint>=4.0.3,<5.0.0",
     "langgraph-sdk>=0.3.0,<0.4.0",
     "langgraph-prebuilt>=1.0.9,<1.1.0",
     "xxhash>=3.5.0",

libs/langgraph/tests/test_channels.py

@@ -1,18 +1,34 @@
 import operator
 from collections.abc import Sequence
+from typing import Annotated
 
 import pytest
+from langchain_core.messages import AIMessage, HumanMessage, RemoveMessage
+from langgraph.checkpoint.base import DELTA_SENTINEL
+from langgraph.checkpoint.memory import InMemorySaver
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from typing_extensions import NotRequired, TypedDict
 
 from langgraph._internal._typing import MISSING
 from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.topic import Topic
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.errors import EmptyChannelError, InvalidUpdateError
+from langgraph.graph import START, StateGraph
+from langgraph.graph.message import _messages_delta_reducer
+from langgraph.graph.state import _get_channel
+from langgraph.types import Overwrite
 
 pytestmark = pytest.mark.anyio
 
 
+# ---------------------------------------------------------------------------
+# Core channel primitives
+# ---------------------------------------------------------------------------
+
+
 def test_last_value() -> None:
     channel = LastValue(int).from_checkpoint(MISSING)
     assert channel.ValueType is int
@@ -95,25 +111,543 @@ def test_untracked_value() -> None:
     assert channel.ValueType is dict
     assert channel.UpdateType is dict
 
-    # UntrackedValue should start empty
     with pytest.raises(EmptyChannelError):
         channel.get()
 
-    # Should be able to update with a value
     test_data = {"session": "test", "temp": "dir"}
     channel.update([test_data])
     assert channel.get() == test_data
 
-    # Update with new value
     new_data = {"session": "updated", "temp": "newdir"}
     channel.update([new_data])
     assert channel.get() == new_data
 
-    # On checkpoint, UntrackedValue should return MISSING
     checkpoint = channel.checkpoint()
     assert checkpoint is MISSING
 
-    # Creating from checkpoint with MISSING should start empty
     new_channel = UntrackedValue(dict).from_checkpoint(checkpoint)
     with pytest.raises(EmptyChannelError):
         new_channel.get()
+
+
+# ---------------------------------------------------------------------------
+# DeltaChannel — message reducer
+# ---------------------------------------------------------------------------
+
+
+def test_delta_channel_basic_two_steps() -> None:
+    ch = DeltaChannel(_messages_delta_reducer, list).from_checkpoint(MISSING)
+
+    ch.update([HumanMessage(content="hi", id="h1")])
+    d1 = ch.checkpoint()
+    assert d1 is DELTA_SENTINEL
+
+    ch.update([AIMessage(content="hello", id="a1")])
+    d2 = ch.checkpoint()
+    assert d2 is DELTA_SENTINEL
+
+    assert len(ch.get()) == 2
+    assert ch.get()[0].content == "hi"
+    assert ch.get()[1].content == "hello"
+
+
+def test_delta_channel_from_checkpoint_writes_list() -> None:
+    """replay_writes on a fresh channel replays through the operator."""
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    ch = spec.from_checkpoint(DELTA_SENTINEL)
+    ch.replay_writes(
+        [
+            ("t0", "messages", HumanMessage(content="hi", id="h1")),
+            ("t1", "messages", AIMessage(content="hello", id="a1")),
+            ("t2", "messages", HumanMessage(content="bye", id="h2")),
+        ]
+    )
+    msgs = ch.get()
+    assert len(msgs) == 3
+    assert msgs[0].content == "hi"
+    assert msgs[1].content == "hello"
+    assert msgs[2].content == "bye"
+
+
+def test_delta_channel_from_checkpoint_backwards_compat() -> None:
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    old_value = [HumanMessage(content="old", id="h1")]
+    ch = spec.from_checkpoint(old_value)
+    assert ch.get() == old_value
+
+
+def test_delta_channel_overwrite() -> None:
+    ch = DeltaChannel(_messages_delta_reducer, list).from_checkpoint(MISSING)
+    ch.update([HumanMessage(content="old", id="h1")])
+
+    ch.update([Overwrite([HumanMessage(content="new", id="h2")])])
+    d = ch.checkpoint()
+    assert d is DELTA_SENTINEL
+    assert len(ch.get()) == 1
+    assert ch.get()[0].content == "new"
+
+
+def test_delta_channel_remove_message_and_replay() -> None:
+    """RemoveMessage must round-trip correctly when writes are replayed."""
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    ch = spec.from_checkpoint(MISSING)
+
+    ch.update([HumanMessage(content="hi", id="h1")])
+    ch.update([AIMessage(content="hello", id="a1")])
+    assert ch.get() == [
+        HumanMessage(content="hi", id="h1"),
+        AIMessage(content="hello", id="a1"),
+    ]
+
+    ch.update([RemoveMessage(id="a1")])
+    assert ch.get() == [HumanMessage(content="hi", id="h1")]
+
+    ch2 = spec.from_checkpoint(DELTA_SENTINEL)
+    ch2.replay_writes(
+        [
+            ("t0", "messages", HumanMessage(content="hi", id="h1")),
+            ("t1", "messages", AIMessage(content="hello", id="a1")),
+            ("t2", "messages", RemoveMessage(id="a1")),
+        ]
+    )
+    assert ch2.get() == [HumanMessage(content="hi", id="h1")]
+
+
+def test_delta_channel_update_by_id_and_replay() -> None:
+    """Updating a message by ID must round-trip correctly through writes replay."""
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    ch = spec.from_checkpoint(MISSING)
+
+    ch.update([HumanMessage(content="original", id="h1")])
+    ch.update([HumanMessage(content="updated", id="h1")])
+    assert ch.get() == [HumanMessage(content="updated", id="h1")]
+
+    ch2 = spec.from_checkpoint(DELTA_SENTINEL)
+    ch2.replay_writes(
+        [
+            ("t0", "messages", HumanMessage(content="original", id="h1")),
+            ("t1", "messages", HumanMessage(content="updated", id="h1")),
+        ]
+    )
+    assert len(ch2.get()) == 1
+    assert ch2.get()[0].content == "updated"
+
+
+def test_delta_channel_checkpoint_returns_sentinel() -> None:
+    """checkpoint() always returns DELTA_SENTINEL regardless of state."""
+    ch = DeltaChannel(_messages_delta_reducer, list).from_checkpoint(MISSING)
+    assert ch.checkpoint() is DELTA_SENTINEL
+
+    ch.update([HumanMessage(content="hi", id="h1")])
+    assert ch.checkpoint() is DELTA_SENTINEL
+
+
+# ---------------------------------------------------------------------------
+# DeltaChannel — snapshot frequency
+# ---------------------------------------------------------------------------
+
+
+def test_delta_channel_snapshot_step_based() -> None:
+    """Snapshots fire on every Nth step regardless of whether the channel was written.
+
+    With snapshot_frequency=N, every Nth pregel step produces a _DeltaSnapshot
+    blob — even if the channel had no write that step (eager snapshot). This
+    bounds the ancestor walk to at most N steps on any read.
+    """
+
+    class State(TypedDict):
+        messages: Annotated[
+            list, DeltaChannel(_messages_delta_reducer, snapshot_frequency=5)
+        ]
+        other: str
+
+    def node_a(state: State) -> dict:
+        i = len(state["messages"]) // 2
+        return {"messages": [AIMessage(content=f"a{i}", id=f"a{i}")]}
+
+    def node_b(state: State) -> dict:
+        return {"other": "y"}
+
+    g = StateGraph(State)
+    g.add_node("a", node_a)
+    g.add_node("b", node_b)
+    g.add_edge(START, "a")
+    g.add_edge("a", "b")
+    saver = InMemorySaver()
+    graph = g.compile(checkpointer=saver)
+
+    config = {"configurable": {"thread_id": "t1"}}
+    for i in range(6):
+        graph.invoke(
+            {"messages": [HumanMessage(content=f"h{i}", id=f"h{i}")], "other": ""},
+            config,
+        )
+
+    msg_blob_values = [
+        saver.serde.loads_typed((type_tag, blob))
+        for k, (type_tag, blob) in saver.blobs.items()
+        if k[2] == "messages" and type_tag == "msgpack" and blob
+    ]
+    snapshots = [v for v in msg_blob_values if isinstance(v, _DeltaSnapshot)]
+    assert snapshots, "expected at least one _DeltaSnapshot blob for messages"
+
+    state = graph.get_state(config)
+    assert len(state.values["messages"]) == 12  # 6 human + 6 AI
+
+
+def test_delta_channel_snapshot_fires_even_when_not_written() -> None:
+    """Eager snapshot: _DeltaSnapshot stored at snapshot step even when the
+    channel had no write that step (node_b doesn't touch messages).
+    """
+
+    class State(TypedDict):
+        messages: Annotated[
+            list, DeltaChannel(_messages_delta_reducer, snapshot_frequency=3)
+        ]
+        tick: int
+
+    def writer(state: State) -> dict:
+        i = len(state["messages"]) // 2
+        return {"messages": [AIMessage(content=f"a{i}", id=f"a{i}")]}
+
+    def ticker(state: State) -> dict:
+        return {"tick": state["tick"] + 1}
+
+    g = StateGraph(State)
+    g.add_node("writer", writer)
+    g.add_node("ticker", ticker)
+    g.add_edge(START, "writer")
+    g.add_edge("writer", "ticker")
+    saver = InMemorySaver()
+    graph = g.compile(checkpointer=saver)
+
+    config = {"configurable": {"thread_id": "t1"}}
+    for i in range(5):
+        graph.invoke(
+            {"messages": [HumanMessage(content=f"h{i}", id=f"h{i}")], "tick": 0},
+            config,
+        )
+
+    msg_blobs = {
+        k: saver.serde.loads_typed((t, b))
+        for k, (t, b) in saver.blobs.items()
+        if k[2] == "messages" and t == "msgpack" and b
+    }
+    snapshots = {k: v for k, v in msg_blobs.items() if isinstance(v, _DeltaSnapshot)}
+    assert snapshots, (
+        "eager snapshots must fire even on steps where messages wasn't written"
+    )
+
+    state = graph.get_state(config)
+    assert len(state.values["messages"]) == 10  # 5 human + 5 AI
+
+
+# ---------------------------------------------------------------------------
+# DeltaChannel — end-to-end (InMemorySaver)
+# ---------------------------------------------------------------------------
+
+
+def test_delta_channel_inmemory_saver_assembles_writes() -> None:
+    """InMemorySaver assembles writes from checkpoint_writes inside get_tuple."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer, list)]
+
+    n = {"v": 0}
+
+    def respond(state: State) -> dict:
+        n["v"] += 1
+        return {"messages": [AIMessage(content=f"ok{n['v']}", id=f"ai{n['v']}")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+    saver = InMemorySaver()
+    graph = builder.compile(checkpointer=saver)
+    config = {"configurable": {"thread_id": "t1"}}
+
+    graph.invoke({"messages": [HumanMessage(content="hi", id="h1")]}, config)
+    graph.invoke({"messages": [HumanMessage(content="bye", id="h2")]}, config)
+
+    saved = saver.get_tuple(config)
+    assert saved is not None
+    assert "messages" in saved.checkpoint["channel_values"]
+    assert saved.checkpoint["channel_values"]["messages"] is DELTA_SENTINEL
+
+    state = graph.get_state(config)
+    assert len(state.values["messages"]) == 4  # 2 human + 2 AI
+
+
+# ---------------------------------------------------------------------------
+# DeltaChannel — dict reducer
+# ---------------------------------------------------------------------------
+
+
+def _delta_channel_with_type(op, typ):
+    """Build a DeltaChannel with an explicit type via the Annotated injection path."""
+    return _get_channel("_test", Annotated[typ, DeltaChannel(op)])
+
+
+def test_delta_channel_dict_reducer_fresh_channel() -> None:
+    """DeltaChannel with a dict reducer starts as empty dict on MISSING checkpoint."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    ch = _delta_channel_with_type(merge_dicts, dict).from_checkpoint(MISSING)
+    assert ch.is_available()
+    assert ch.get() == {}
+
+
+def test_delta_channel_dict_reducer_basic_updates() -> None:
+    """DeltaChannel with a dict reducer accumulates key/value pairs across steps."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    ch = _delta_channel_with_type(merge_dicts, dict).from_checkpoint(MISSING)
+
+    ch.update([{"a": 1}])
+    d1 = ch.checkpoint()
+    assert d1 is DELTA_SENTINEL
+
+    ch.update([{"b": 2}])
+    d2 = ch.checkpoint()
+    assert d2 is DELTA_SENTINEL
+
+    assert ch.get() == {"a": 1, "b": 2}
+
+
+def test_delta_channel_dict_reducer_writes_reconstruction() -> None:
+    """replay_writes on a fresh channel replays through a dict merge reducer."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    spec = _delta_channel_with_type(merge_dicts, dict)
+    ch = spec.from_checkpoint(DELTA_SENTINEL)
+    ch.replay_writes(
+        [
+            ("t0", "files", {"a": 1}),
+            ("t1", "files", {"b": 2}),
+            ("t2", "files", {"c": 3}),
+        ]
+    )
+    assert ch.get() == {"a": 1, "b": 2, "c": 3}
+
+
+def test_delta_channel_dict_reducer_with_deletions() -> None:
+    """Dict reducer that treats None values as deletions works end-to-end."""
+
+    def merge_files(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            for k, v in w.items():
+                if v is None:
+                    result.pop(k, None)
+                else:
+                    result[k] = v
+        return result
+
+    ch = _delta_channel_with_type(merge_files, dict).from_checkpoint(MISSING)
+    ch.update([{"file1.py": "content1", "file2.py": "content2"}])
+    ch.update([{"file1.py": None, "file3.py": "content3"}])
+    assert ch.get() == {"file2.py": "content2", "file3.py": "content3"}
+
+    spec = _delta_channel_with_type(merge_files, dict)
+    ch2 = spec.from_checkpoint(DELTA_SENTINEL)
+    ch2.replay_writes(
+        [
+            ("t0", "files", {"file1.py": "content1", "file2.py": "content2"}),
+            ("t1", "files", {"file1.py": None, "file3.py": "content3"}),
+        ]
+    )
+    assert ch2.get() == {"file2.py": "content2", "file3.py": "content3"}
+
+
+def test_delta_channel_dict_reducer_overwrite_in_update() -> None:
+    """Overwrite(dict) in update() must preserve dict shape, not coerce to list."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    ch = _delta_channel_with_type(merge_dicts, dict).from_checkpoint(MISSING)
+    ch.update([{"a": 1}])
+    ch.update([Overwrite({"b": 2, "c": 3})])
+    assert ch.get() == {"b": 2, "c": 3}
+
+
+def test_delta_channel_dict_reducer_overwrite_in_writes_replay() -> None:
+    """Overwrite(dict) embedded in replayed writes must reconstruct as dict."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    spec = _delta_channel_with_type(merge_dicts, dict)
+    ch = spec.from_checkpoint(DELTA_SENTINEL)
+    ch.replay_writes(
+        [
+            ("t0", "files", {"a": 1}),
+            ("t1", "files", Overwrite({"x": 10, "y": 20})),
+            ("t2", "files", {"z": 30}),
+        ]
+    )
+    assert ch.get() == {"x": 10, "y": 20, "z": 30}
+
+
+def test_delta_channel_dict_reducer_with_notrequired_annotation() -> None:
+    """DeltaChannel infers dict type through `Annotated[NotRequired[dict[...]], ch]`."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    annotation = Annotated[NotRequired[dict[str, int]], DeltaChannel(merge_dicts)]
+    ch = _get_channel("files", annotation).from_checkpoint(MISSING)
+    assert ch.get() == {}
+    ch.update([{"a": 1}])
+    ch.update([{"b": 2}])
+    assert ch.get() == {"a": 1, "b": 2}
+
+
+def test_delta_channel_dict_reducer_end_to_end_filesystem() -> None:
+    """End-to-end: graph with dict-reducer (filesystem-style) channel wrapped in DeltaChannel."""
+
+    def merge_files(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            for k, v in w.items():
+                if v is None:
+                    result.pop(k, None)
+                else:
+                    result[k] = v
+        return result
+
+    class State(TypedDict):
+        files: Annotated[dict[str, str], DeltaChannel(merge_files)]
+
+    turn = {"v": 0}
+
+    def write_file(state: State) -> dict:
+        turn["v"] += 1
+        n = turn["v"]
+        return {"files": {f"/doc_{n}.txt": f"content for turn {n}"}}
+
+    builder = StateGraph(State)
+    builder.add_node("write_file", write_file)
+    builder.add_edge(START, "write_file")
+    saver = InMemorySaver()
+    graph = builder.compile(checkpointer=saver)
+    config = {"configurable": {"thread_id": "fs"}}
+
+    for _ in range(3):
+        graph.invoke({"files": {}}, config)
+
+    saved = saver.get_tuple(config)
+    assert saved is not None
+    assert saved.checkpoint["channel_values"]["files"] is DELTA_SENTINEL
+    state = graph.get_state(config)
+    assert state.values["files"] == {
+        "/doc_1.txt": "content for turn 1",
+        "/doc_2.txt": "content for turn 2",
+        "/doc_3.txt": "content for turn 3",
+    }
+
+    def delete_file(state: State) -> dict:
+        return {"files": {"/doc_1.txt": None}}
+
+    builder2 = StateGraph(State)
+    builder2.add_node("write_file", write_file)
+    builder2.add_node("delete_file", delete_file)
+    builder2.add_edge(START, "write_file")
+    builder2.add_edge("write_file", "delete_file")
+    turn["v"] = 0
+    saver2 = InMemorySaver()
+    graph2 = builder2.compile(checkpointer=saver2)
+    config2 = {"configurable": {"thread_id": "fs2"}}
+    graph2.invoke({"files": {}}, config2)
+    state2 = graph2.get_state(config2)
+    assert state2.values["files"] == {}
+
+
+def test_delta_channel_dict_reducer_backwards_compat() -> None:
+    """A pre-DeltaChannel dict checkpoint must load as a dict, not be listified."""
+
+    def merge_dicts(state: dict, writes: list) -> dict:
+        result = dict(state)
+        for w in writes:
+            result.update(w)
+        return result
+
+    spec = _delta_channel_with_type(merge_dicts, dict)
+    old_value = {"a": 1, "b": 2}
+    ch = spec.from_checkpoint(old_value)
+    assert ch.get() == {"a": 1, "b": 2}
+
+
+# ---------------------------------------------------------------------------
+# DeltaChannel — seed / pre-delta migration
+# ---------------------------------------------------------------------------
+
+
+def test_delta_channel_from_checkpoint_honors_seed() -> None:
+    """A non-sentinel value to from_checkpoint is used as the pre-delta seed.
+
+    Guards the pre-delta migration path: when the saver's ancestor walk hits
+    a pre-DeltaChannel blob it passes it as `seed` so replay reconstructs
+    the post-migration state correctly rather than replaying from empty.
+    """
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    seed = [HumanMessage(content="pre-delta", id="p1")]
+    ch = spec.from_checkpoint(seed)
+    ch.replay_writes(
+        [
+            ("t0", "messages", AIMessage(content="delta-1", id="d1")),
+            ("t1", "messages", HumanMessage(content="delta-2", id="d2")),
+        ]
+    )
+    msgs = ch.get()
+    assert [m.content for m in msgs] == ["pre-delta", "delta-1", "delta-2"]
+
+
+def test_delta_channel_from_checkpoint_seed_without_writes() -> None:
+    """Reconstruction at a pre-delta ancestor with no newer deltas returns
+    just the seed — the saver's terminator fired immediately."""
+    spec = DeltaChannel(_messages_delta_reducer, list)
+    seed = [HumanMessage(content="only-snap", id="s1")]
+    ch = spec.from_checkpoint(seed)
+    ch.replay_writes([])
+    assert ch.get() == seed
+
+
+def test_delta_channel_from_checkpoint_seed_none_is_distinct_from_sentinel() -> None:
+    """`seed=None` must start replay from None, not from an empty channel.
+
+    The DELTA_SENTINEL / MISSING sentinels mean 'no seed'; passing `None`
+    explicitly should feed None to the reducer as the left operand.
+    """
+
+    def replace(state, writes):
+        return writes[-1] if writes else state
+
+    spec = DeltaChannel(replace, list)
+    ch = spec.from_checkpoint(None)
+    ch.replay_writes([("t0", "x", "after")])
+    assert ch.get() == "after"

libs/langgraph/tests/test_delta_channel_benchmark.py

@@ -0,0 +1,478 @@
+"""Benchmark: DeltaChannel snapshot_frequency — storage vs. read-depth tradeoff.
+
+Run directly:  python tests/test_delta_channel_benchmark.py
+Run via pytest: pytest tests/test_delta_channel_benchmark.py -s
+
+Part 1 — baseline (original): DeltaChannel(inf) vs add_messages (BinOp).
+Part 2 — snapshot_frequency sweep: shows the storage/read-latency tradeoff
+  across frequencies [1, 5, 10, 50, inf] at scale.
+
+Key insight:
+  snapshot_frequency=inf  → O(N) storage, O(N) read depth (pure delta)
+  snapshot_frequency=N    → O(N²/N) storage, O(N) read depth bounded by freq
+  snapshot_frequency=1    → O(N²) storage, O(1) read depth (full snapshot)
+"""
+
+from __future__ import annotations
+
+import contextlib
+import math
+import os
+import sys
+import time
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.messages import AIMessage, HumanMessage
+from langgraph.checkpoint.memory import MemorySaver
+from typing_extensions import TypedDict
+
+from langgraph.channels.delta import DeltaChannel
+from langgraph.graph import END, StateGraph
+from langgraph.graph.message import _messages_delta_reducer, add_messages
+
+try:
+    from langgraph.checkpoint.postgres import PostgresSaver
+
+    _POSTGRES_AVAILABLE = True
+    _POSTGRES_URI = os.environ.get(
+        "LANGGRAPH_BENCH_POSTGRES_URI",
+        "postgres://postgres@localhost:5432/postgres?sslmode=disable",
+    )
+except ImportError:
+    _POSTGRES_AVAILABLE = False
+
+# ---------------------------------------------------------------------------
+# Realistic message payload (~100 tokens / ~400 chars each)
+# ---------------------------------------------------------------------------
+
+_HUMAN_TEMPLATE = (
+    "I need help understanding the implications of {topic} on our system architecture. "
+    "Specifically, I'm concerned about how this interacts with our existing {concern} "
+    "and whether we need to refactor the {component} layer before proceeding. "
+    "We've had prior incidents in this area and want to be deliberate. "
+    "What should we prioritize first, and are there known failure modes we should design around from the start?"
+)
+
+_AI_TEMPLATE = (
+    "Great question about {topic}. The key insight here is that {concern} introduces "
+    "a subtle ordering dependency that most teams overlook until they hit it in production. "
+    "For your {component} layer specifically, I'd recommend starting with a careful audit "
+    "of the interface boundaries before making any structural changes. This will give you "
+    "a clear picture of the blast radius and let you sequence the migration safely."
+)
+
+_TOPICS = [
+    "distributed tracing",
+    "eventual consistency",
+    "schema migration",
+    "backpressure handling",
+    "idempotency guarantees",
+    "cache invalidation",
+    "connection pooling",
+    "rate limiting",
+    "circuit breaking",
+    "observability pipelines",
+]
+
+_CONCERNS = [
+    "concurrency model",
+    "retry semantics",
+    "state management",
+    "error propagation",
+    "latency budget",
+]
+
+_COMPONENTS = [
+    "persistence",
+    "routing",
+    "ingestion",
+    "aggregation",
+    "serialization",
+]
+
+
+def _human_content(i: int) -> str:
+    return _HUMAN_TEMPLATE.format(
+        topic=_TOPICS[i % len(_TOPICS)],
+        concern=_CONCERNS[i % len(_CONCERNS)],
+        component=_COMPONENTS[i % len(_COMPONENTS)],
+    )
+
+
+def _ai_content(i: int) -> str:
+    return _AI_TEMPLATE.format(
+        topic=_TOPICS[i % len(_TOPICS)],
+        concern=_CONCERNS[i % len(_CONCERNS)],
+        component=_COMPONENTS[i % len(_COMPONENTS)],
+    )
+
+
+# ---------------------------------------------------------------------------
+# State definitions
+# ---------------------------------------------------------------------------
+
+
+class BinaryState(TypedDict):
+    messages: Annotated[list, add_messages]
+
+
+class DeltaState(TypedDict):
+    messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+
+def _make_delta_state(snapshot_frequency: int | float) -> type:
+    """Create a TypedDict with DeltaChannel at the given snapshot_frequency."""
+    channel = DeltaChannel(
+        _messages_delta_reducer, snapshot_frequency=snapshot_frequency
+    )
+    # Use the functional TypedDict form so the Annotated type is stored as an
+    # already-evaluated object rather than a forward-reference string (which
+    # would fail when get_type_hints tries to resolve 'snapshot_frequency').
+    return TypedDict(  # type: ignore[return-value]
+        f"DeltaState_freq{snapshot_frequency}",
+        {"messages": Annotated[list, channel]},
+    )
+
+
+# ---------------------------------------------------------------------------
+# Graph factory
+# ---------------------------------------------------------------------------
+
+
+def _make_graph(state_cls: type, checkpointer: Any = None) -> Any:
+    def human_node(state: Any) -> dict:
+        return {}
+
+    def ai_node(state: Any) -> dict:
+        i = len(state["messages"]) // 2
+        return {"messages": [AIMessage(content=_ai_content(i), id=f"a{i}")]}
+
+    g = StateGraph(state_cls)
+    g.add_node("human", human_node)
+    g.add_node("ai", ai_node)
+    g.add_edge("human", "ai")
+    g.add_edge("ai", END)
+    g.set_entry_point("human")
+    return g.compile(checkpointer=checkpointer or MemorySaver())
+
+
+# ---------------------------------------------------------------------------
+# Measurement helpers
+# ---------------------------------------------------------------------------
+
+
+def _total_blob_bytes(saver: MemorySaver) -> int:
+    total = 0
+    for (_, _, _, _), (type_tag, blob) in saver.blobs.items():
+        if blob is not None:
+            total += len(blob)
+    return total
+
+
+def _run_turns(
+    n_turns: int,
+    state_cls: type,
+    checkpointer: Any = None,
+) -> tuple[float, float, int]:
+    """Run n_turns conversation turns.
+
+    Returns (write_elapsed_s, read_elapsed_s, total_blob_bytes).
+    Read latency is the average of 5 get_state calls after the full history
+    is built — forces state rehydration including ancestor replay if needed.
+    """
+    graph = _make_graph(state_cls, checkpointer)
+    config = {"configurable": {"thread_id": "bench"}}
+
+    t0 = time.perf_counter()
+    for i in range(n_turns):
+        graph.invoke(
+            {"messages": [HumanMessage(content=_human_content(i), id=f"h{i}")]},
+            config,
+        )
+    write_elapsed = time.perf_counter() - t0
+
+    t1 = time.perf_counter()
+    for _ in range(5):
+        graph.get_state(config)
+    read_elapsed = (time.perf_counter() - t1) / 5
+
+    blob_bytes = (
+        _total_blob_bytes(graph.checkpointer)
+        if isinstance(graph.checkpointer, MemorySaver)
+        else -1
+    )
+    return write_elapsed, read_elapsed, blob_bytes
+
+
+def _fmt_bytes(n: int) -> str:
+    if n >= 1_000_000:
+        return f"{n / 1_000_000:.1f} MB"
+    if n >= 1_000:
+        return f"{n / 1_000:.1f} KB"
+    return f"{n} B"
+
+
+def _approx_tokens(n_turns: int) -> str:
+    tokens = n_turns * 200
+    if tokens >= 1_000_000:
+        return f"~{tokens / 1_000_000:.1f}M tok"
+    if tokens >= 1_000:
+        return f"~{tokens / 1_000:.0f}K tok"
+    return f"~{tokens} tok"
+
+
+# ---------------------------------------------------------------------------
+# Checkpointer factories
+# ---------------------------------------------------------------------------
+
+
+@contextlib.contextmanager
+def _pg_saver(thread_id: str = "bench"):
+    """Context manager that yields a fresh PostgresSaver and cleans up after."""
+    with PostgresSaver.from_conn_string(_POSTGRES_URI) as saver:
+        saver.setup()
+        with saver._cursor() as cur:
+            for tbl in ("checkpoints", "checkpoint_blobs", "checkpoint_writes"):
+                cur.execute(f"DELETE FROM {tbl} WHERE thread_id = %s", (thread_id,))
+        yield saver
+        with saver._cursor() as cur:
+            for tbl in ("checkpoints", "checkpoint_blobs", "checkpoint_writes"):
+                cur.execute(f"DELETE FROM {tbl} WHERE thread_id = %s", (thread_id,))
+
+
+def _checkpointers() -> list[tuple[str, Any]]:
+    """Return (label, saver_or_None) pairs for available checkpointers."""
+    result: list[tuple[str, Any]] = [("InMemory", None)]
+    if _POSTGRES_AVAILABLE:
+        try:
+            import psycopg
+
+            psycopg.connect(_POSTGRES_URI).close()
+            result.append(("Postgres", "postgres"))
+        except Exception:
+            pass
+    return result
+
+
+# ---------------------------------------------------------------------------
+# Part 1: baseline DeltaChannel(inf) vs add_messages
+# ---------------------------------------------------------------------------
+
+BASELINE_TURN_COUNTS = [10, 25, 50, 100, 500]
+DELTA_ONLY_TURN_COUNTS = [1000]
+
+
+def _run_baseline_for_checkpointer(cp_label: str, cp_hint: Any) -> None:
+    W = 72
+
+    def _make_saver():
+        if cp_hint is None:
+            return contextlib.nullcontext(None)
+        return _pg_saver()
+
+    rows: list[tuple[int, Any, Any, Any, Any, Any, Any]] = []
+    for turns in BASELINE_TURN_COUNTS:
+        with _make_saver() as saver:
+            b_wt, b_rt, b_bytes = _run_turns(turns, BinaryState, saver)
+        with _make_saver() as saver:
+            d_wt, d_rt, d_bytes = _run_turns(turns, DeltaState, saver)
+        rows.append((turns, b_bytes, d_bytes, b_rt, d_rt, b_wt, d_wt))
+    for turns in DELTA_ONLY_TURN_COUNTS:
+        with _make_saver() as saver:
+            d_wt, d_rt, d_bytes = _run_turns(turns, DeltaState, saver)
+        rows.append((turns, None, d_bytes, None, d_rt, None, d_wt))
+
+    def _bytes_or_na(v: Any) -> str:
+        if v is None or v < 0:
+            return "n/a"
+        return _fmt_bytes(v)
+
+    def _ms_or_na(v: Any) -> str:
+        return "n/a" if v is None else f"{v * 1000:.1f}ms"
+
+    print(f"\n  [{cp_label}] Storage (blob bytes)")
+    print(
+        f"  {'turns':>6}  {'ctx':>10}  {'add_msgs':>12}  {'delta(inf)':>12}  {'savings':>8}"
+    )
+    print("  " + "-" * (W - 2))
+    for turns, b_bytes, d_bytes, b_rt, d_rt, b_wt, d_wt in rows:
+        if b_bytes is None or b_bytes < 0 or d_bytes is None or d_bytes < 0:
+            ratio_str = "n/a"
+        else:
+            ratio = b_bytes / d_bytes if d_bytes else float("inf")
+            ratio_str = f"{ratio:.0f}x"
+        print(
+            f"  {turns:>6}  {_approx_tokens(turns):>10}  "
+            f"{_bytes_or_na(b_bytes):>12}  {_bytes_or_na(d_bytes):>12}  {ratio_str:>8}"
+        )
+
+    print(f"\n  [{cp_label}] Read latency (avg of 5 get_state calls)")
+    print(f"  {'turns':>6}  {'ctx':>10}  {'add_msgs':>12}  {'delta(inf)':>12}")
+    print("  " + "-" * (W - 2))
+    for turns, b_bytes, d_bytes, b_rt, d_rt, b_wt, d_wt in rows:
+        print(
+            f"  {turns:>6}  {_approx_tokens(turns):>10}  "
+            f"{_ms_or_na(b_rt):>12}  {_ms_or_na(d_rt):>12}"
+        )
+
+
+def run_baseline_benchmark() -> None:
+    print()
+    print("Part 1 — DeltaChannel(inf) vs add_messages: storage & latency")
+    print("=" * 72)
+    for cp_label, cp_hint in _checkpointers():
+        _run_baseline_for_checkpointer(cp_label, cp_hint)
+    print()
+
+
+# ---------------------------------------------------------------------------
+# Part 2: snapshot_frequency sweep
+# ---------------------------------------------------------------------------
+
+# Frequencies to test. 1 = always snapshot (like BinOp), inf = pure delta.
+SNAPSHOT_FREQUENCIES: list[int | float] = [1, 5, 10, 50, math.inf]
+
+# Turn counts for the sweep — high enough to show storage divergence.
+SWEEP_TURN_COUNTS = [50, 100, 500]
+
+
+def _freq_label(freq: int | float) -> str:
+    if freq == math.inf:
+        return "inf"
+    return str(int(freq))
+
+
+def _run_sweep_for_checkpointer(cp_label: str, cp_hint: Any) -> None:
+    def _make_saver():
+        if cp_hint is None:
+            return contextlib.nullcontext(None)
+        return _pg_saver()
+
+    # Collect results: {turns: {freq_label: (write_s, read_s, bytes)}}
+    results: dict[int, dict[str, tuple[float, float, int]]] = {}
+    for turns in SWEEP_TURN_COUNTS:
+        results[turns] = {}
+        for freq in SNAPSHOT_FREQUENCIES:
+            state_cls = _make_delta_state(freq)
+            with _make_saver() as saver:
+                wt, rt, bb = _run_turns(turns, state_cls, saver)
+            results[turns][_freq_label(freq)] = (wt, rt, bb)
+
+    freq_labels = [_freq_label(f) for f in SNAPSHOT_FREQUENCIES]
+    col_w = 12
+
+    header = f"  {'turns':>6}  {'ctx':>10}" + "".join(
+        f"  {f'freq={freq_label}':>{col_w}}" for freq_label in freq_labels
+    )
+
+    print(f"\n  [{cp_label}] Storage (blob bytes) — lower is better")
+    print(header)
+    print("  " + "-" * (len(header) - 2))
+    for turns in SWEEP_TURN_COUNTS:
+        row = f"  {turns:>6}  {_approx_tokens(turns):>10}"
+        for label in freq_labels:
+            _, _, bb = results[turns][label]
+            row += f"  {_fmt_bytes(bb) if bb >= 0 else 'n/a':>{col_w}}"
+        print(row)
+
+    print(f"\n  [{cp_label}] Read latency (avg of 5 get_state) — lower is better")
+    print(header)
+    print("  " + "-" * (len(header) - 2))
+    for turns in SWEEP_TURN_COUNTS:
+        row = f"  {turns:>6}  {_approx_tokens(turns):>10}"
+        for label in freq_labels:
+            _, rt, _ = results[turns][label]
+            row += f"  {f'{rt * 1000:.1f}ms':>{col_w}}"
+        print(row)
+
+    print(
+        f"\n  [{cp_label}] Per-invoke write latency (total / turns) — lower is better"
+    )
+    print(header)
+    print("  " + "-" * (len(header) - 2))
+    for turns in SWEEP_TURN_COUNTS:
+        row = f"  {turns:>6}  {_approx_tokens(turns):>10}"
+        for label in freq_labels:
+            wt, _, _ = results[turns][label]
+            row += f"  {f'{(wt / turns) * 1000:.1f}ms':>{col_w}}"
+        print(row)
+
+
+def run_snapshot_freq_benchmark() -> None:
+    print()
+    print("Part 2 — DeltaChannel snapshot_frequency sweep")
+    print("Lower freq → fewer snapshots → less storage but deeper read replay")
+    print("=" * 80)
+    for cp_label, cp_hint in _checkpointers():
+        _run_sweep_for_checkpointer(cp_label, cp_hint)
+    print()
+    print("Legend:")
+    print(
+        "  freq=1    snapshot every write (full blob always — same as add_messages / BinOp)"
+    )
+    print("  freq=N    snapshot every N writes; read walks at most N ancestor writes")
+    print("  freq=inf  pure delta; read walks entire ancestor chain")
+    print()
+
+
+# ---------------------------------------------------------------------------
+# Pytest entry points
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.skip(
+    reason="slow benchmark — run manually with: python tests/test_delta_channel_benchmark.py"
+)
+def test_delta_channel_baseline_benchmark(capsys: Any) -> None:
+    """DeltaChannel(inf) uses less storage than add_messages at scale."""
+    with capsys.disabled():
+        run_baseline_benchmark()
+
+    for turns in [25, 50]:
+        _, _, b_bytes = _run_turns(turns, BinaryState)
+        _, _, d_bytes = _run_turns(turns, DeltaState)
+        assert d_bytes < b_bytes, (
+            f"DeltaChannel should use less storage at {turns} turns, "
+            f"got delta={d_bytes} binary={b_bytes}"
+        )
+
+
+@pytest.mark.skip(
+    reason="slow benchmark — run manually with: python tests/test_delta_channel_benchmark.py"
+)
+def test_snapshot_freq_benchmark(capsys: Any) -> None:
+    """snapshot_frequency trades storage for bounded read depth."""
+    with capsys.disabled():
+        run_snapshot_freq_benchmark()
+
+    # Correctness: results at all frequencies should agree on final state.
+    n_turns = 20
+    states: dict[str, list] = {}
+    for freq in SNAPSHOT_FREQUENCIES:
+        state_cls = _make_delta_state(freq)
+        graph = _make_graph(state_cls)
+        config = {"configurable": {"thread_id": "correctness"}}
+        for i in range(n_turns):
+            graph.invoke(
+                {"messages": [HumanMessage(content=_human_content(i), id=f"h{i}")]},
+                config,
+            )
+        state = graph.get_state(config)
+        states[_freq_label(freq)] = [m.id for m in state.values["messages"]]
+
+    ref = states["inf"]
+    for label, msg_ids in states.items():
+        assert msg_ids == ref, (
+            f"freq={label} produced different message IDs than freq=inf"
+        )
+
+
+# ---------------------------------------------------------------------------
+# Script entry point
+# ---------------------------------------------------------------------------
+
+if __name__ == "__main__":
+    run_baseline_benchmark()
+    run_snapshot_freq_benchmark()
+    sys.exit(0)

libs/langgraph/tests/test_delta_channel_migration.py

@@ -0,0 +1,613 @@
+"""Tests for the BinaryOperatorAggregate -> DeltaChannel migration path.
+
+A thread written under `BinaryOperatorAggregate(...)` must keep working
+after its annotation is swapped to `DeltaChannel(...)` on the same
+checkpointer — pre-migration state visible at each *settled* ancestor
+checkpoint is preserved, and post-migration writes fold on top through
+the reducer.
+
+Mechanism under test: the saver's `_get_channel_writes_history(config,
+channel)` walks the parent chain; when it encounters an ancestor whose
+`channel_values[channel]` is a real value (not `DELTA_SENTINEL`), it
+returns that as the `seed`. `DeltaChannel.from_checkpoint(seed)` uses
+it as the base value, and `replay_writes(writes)` folds on-path deltas.
+
+Scenarios covered:
+
+1. **Basic migration (sync + async)**: build pre-migration state with
+   `BinaryOperatorAggregate`, swap the annotation to `DeltaChannel` on
+   the same checkpointer, and verify that every settled pre-migration
+   super-step boundary (`next=('__start__',)`) round-trips exactly
+   under the delta-channel view.
+2. **Time travel into a pre-migration checkpoint** after migration —
+   `graph.get_state(pre_migration_config)` at a settled ancestor
+   returns the same state as under the binop channel.
+3. **Continuing a migrated thread**: driving one more super-step after
+   migration produces a state that includes the pre-migration settled
+   prefix plus the new delta write — proving `from_checkpoint(seed)` +
+   `replay_writes` correctly fold post-migration deltas onto the
+   pre-migration seed.
+4. **Base-saver fallback path**: a third-party-style subclass that
+   removes the optimized `InMemorySaver` override and falls back to
+   `BaseCheckpointSaver._get_channel_writes_history` must produce the
+   same result as the optimized path.
+5. **Channel-type isolation across threads**: two threads on the same
+   checkpointer under the delta-channel graph — one freshly-started,
+   one migrated from pre-migration state — don't cross-contaminate.
+   The parent-chain walk is scoped to the thread.
+
+TODO: add postgres variants in the existing `libs/checkpoint-postgres`
+test files (different fixture setup; not this file).
+"""
+
+from __future__ import annotations
+
+import operator
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.messages import AIMessage, HumanMessage
+from langgraph.checkpoint.memory import InMemorySaver
+from typing_extensions import TypedDict
+
+from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
+from langgraph.graph import END, START, StateGraph
+from langgraph.graph.message import _messages_delta_reducer, add_messages
+
+pytestmark = pytest.mark.anyio
+
+
+# ---------------------------------------------------------------------------
+# Graph factories
+#
+# A minimal reducer (`operator.add` on lists of str) with a noop node keeps
+# state change localized to the HumanMessage-like payload passed through
+# `invoke`. That isolates the pre/post-migration parity assertions to
+# channel-hydration semantics.
+# ---------------------------------------------------------------------------
+
+
+def _noop(_state: Any) -> dict:
+    return {}
+
+
+def _list_concat(state: list, writes: list) -> list:
+    result = list(state)
+    for w in writes:
+        result.extend(w if isinstance(w, list) else [w])
+    return result
+
+
+def _binop_graph(checkpointer: Any) -> Any:
+    class BinopState(TypedDict):
+        items: Annotated[list, BinaryOperatorAggregate(list, operator.add)]
+
+    return (
+        StateGraph(BinopState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _delta_graph(checkpointer: Any) -> Any:
+    class DeltaState(TypedDict):
+        items: Annotated[list, DeltaChannel(_list_concat)]
+
+    return (
+        StateGraph(DeltaState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _drive(graph: Any, config: dict, tag: str, n: int) -> None:
+    for i in range(n):
+        graph.invoke({"items": [f"{tag}{i}"]}, config)
+
+
+async def _adrive(graph: Any, config: dict, tag: str, n: int) -> None:
+    for i in range(n):
+        await graph.ainvoke({"items": [f"{tag}{i}"]}, config)
+
+
+def _settled_boundaries(history: list) -> list[tuple[dict, list]]:
+    """Return `[(config, items), ...]` for every checkpoint in `history`
+    whose `next == ('__start__',)` — the stable boundaries between invokes.
+    """
+    return [
+        (s.config, list(s.values.get("items", [])))
+        for s in history
+        if s.next == ("__start__",)
+    ]
+
+
+# ---------------------------------------------------------------------------
+# 1. Basic migration (sync + async)
+# ---------------------------------------------------------------------------
+
+
+def test_basic_migration_preserves_pre_migration_state() -> None:
+    """Build state under `BinaryOperatorAggregate`, migrate to
+    `DeltaChannel` on the same checkpointer, and verify that every
+    settled pre-migration super-step boundary round-trips exactly.
+
+    Settled boundaries (`next=('__start__',)`) are the stable hydration
+    targets for the migration path: writes that produced the NEXT
+    super-step are kept as `pending_writes` on the ancestor, so walking
+    from a descendant finds the ancestor's blob as the seed and
+    reconstructs the correct state.
+    """
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "basic-sync"}}
+
+    # Pre-migration: accumulate items across 3 invokes.
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 3)
+
+    pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
+    assert len(pre_boundaries) >= 2, "expected multiple settled boundaries"
+
+    # Migrate: swap the annotation on the same checkpointer.
+    delta = _delta_graph(checkpointer)
+
+    for cfg, items in pre_boundaries:
+        snap = delta.get_state(cfg)
+        assert list(snap.values.get("items", [])) == items, (
+            f"snapshot mismatch at {cfg['configurable']['checkpoint_id']}: "
+            f"expected {items}, got {snap.values.get('items', [])}"
+        )
+
+
+async def test_basic_migration_preserves_pre_migration_state_async() -> None:
+    """Async variant of the basic migration scenario."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "basic-async"}}
+
+    binop = _binop_graph(checkpointer)
+    await _adrive(binop, config, "u", 3)
+
+    pre_history = [s async for s in binop.aget_state_history(config)]
+    pre_boundaries = _settled_boundaries(pre_history)
+    assert len(pre_boundaries) >= 2
+
+    delta = _delta_graph(checkpointer)
+
+    for cfg, items in pre_boundaries:
+        snap = await delta.aget_state(cfg)
+        assert list(snap.values.get("items", [])) == items, (
+            f"async snapshot mismatch at {cfg['configurable']['checkpoint_id']}"
+        )
+
+
+# ---------------------------------------------------------------------------
+# 2. Time travel into a pre-migration checkpoint after migration
+# ---------------------------------------------------------------------------
+
+
+def test_time_travel_into_pre_migration_checkpoint() -> None:
+    """After migration, `graph.get_state(pre_migration_config)` at a
+    settled ancestor returns the state as stored at that point."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "time-travel"}}
+
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 3)
+
+    pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
+    assert pre_boundaries, "no settled ancestors to time-travel to"
+
+    delta = _delta_graph(checkpointer)
+
+    # Pick the oldest non-empty boundary — a long distance to walk back.
+    non_empty = [(cfg, items) for cfg, items in pre_boundaries if items]
+    assert non_empty, "expected at least one non-empty boundary"
+    target_cfg, expected_items = non_empty[-1]
+
+    snap = delta.get_state(target_cfg)
+    assert list(snap.values.get("items", [])) == expected_items
+
+
+# ---------------------------------------------------------------------------
+# 3. Continuing a migrated thread: deltas fold onto pre-migration seed
+# ---------------------------------------------------------------------------
+
+
+def test_continuing_migrated_thread_folds_deltas_on_seed() -> None:
+    """Resume a pre-migration settled ancestor via `invoke(None, cfg)`
+    under the delta-channel graph. Since the pre-migration checkpoint
+    has an existing `pending_writes` entry (the input for the NEXT
+    super-step), re-running from that ancestor reproduces the same
+    post-ancestor state as the original binop run.
+
+    This proves the seed-terminator + write-replay pipeline works
+    end-to-end across the migration boundary.
+    """
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "continue"}}
+
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 2)
+
+    # Pick the oldest settled boundary with non-empty state.
+    pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
+    target_cfg, seed_items = next(
+        (cfg, items) for cfg, items in reversed(pre_boundaries) if items
+    )
+    assert seed_items, "need a non-empty seed boundary"
+
+    # Migrate and resume from the pre-migration ancestor. `invoke(None,
+    # cfg)` replays the pending writes staged at `cfg` under the new
+    # channel; the reducer folds those deltas onto the seed.
+    delta = _delta_graph(checkpointer)
+    result = delta.invoke(None, target_cfg)
+
+    # The resumed state must include the pre-migration seed items in order.
+    result_items = list(result.get("items", []))
+    for idx, prefix_item in enumerate(seed_items):
+        assert result_items[idx] == prefix_item, (
+            f"pre-migration seed item at {idx} not preserved: "
+            f"got {result_items[: idx + 1]}, expected {seed_items}"
+        )
+
+
+# ---------------------------------------------------------------------------
+# 4. Base-saver fallback path
+# ---------------------------------------------------------------------------
+
+
+class _ThirdPartyStyleSaver(InMemorySaver):
+    """Simulates a third-party saver that inherits the reference
+    `_get_channel_writes_history` implementation from
+    `BaseCheckpointSaver` rather than overriding it.
+
+    We rebind the two methods to the base-class versions (via MRO) so
+    the fallback path is exercised even though the storage layer is
+    still the in-memory one.
+    """
+
+    # MRO: [_ThirdPartyStyleSaver, InMemorySaver, BaseCheckpointSaver, ...]
+    _get_channel_writes_history = (  # type: ignore[assignment]
+        InMemorySaver.__mro__[1]._get_channel_writes_history  # type: ignore[attr-defined]
+    )
+    _aget_channel_writes_history = (  # type: ignore[assignment]
+        InMemorySaver.__mro__[1]._aget_channel_writes_history  # type: ignore[attr-defined]
+    )
+
+
+def test_base_saver_fallback_matches_optimized_override() -> None:
+    """The reference `BaseCheckpointSaver` implementation must produce
+    the same migration behavior as the optimized `InMemorySaver`
+    override. We drive the same migration scenario through both savers
+    and assert per-snapshot parity in the delta-channel view."""
+
+    # Fast path: optimized InMemorySaver override.
+    fast_saver = InMemorySaver()
+    fast_config = {"configurable": {"thread_id": "fast"}}
+    fast_binop = _binop_graph(fast_saver)
+    _drive(fast_binop, fast_config, "u", 3)
+    fast_delta = _delta_graph(fast_saver)
+    fast_history = [
+        (s.next, list(s.values.get("items", [])))
+        for s in fast_delta.get_state_history(fast_config)
+    ]
+
+    # Slow path: base-class fallback.
+    slow_saver = _ThirdPartyStyleSaver()
+    slow_config = {"configurable": {"thread_id": "slow"}}
+    slow_binop = _binop_graph(slow_saver)
+    _drive(slow_binop, slow_config, "u", 3)
+    slow_delta = _delta_graph(slow_saver)
+    slow_history = [
+        (s.next, list(s.values.get("items", [])))
+        for s in slow_delta.get_state_history(slow_config)
+    ]
+
+    assert slow_history == fast_history, (
+        "base-saver fallback should match optimized-override behavior; "
+        f"fast={fast_history}, slow={slow_history}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# 5. Thread isolation under mixed-generation storage
+# ---------------------------------------------------------------------------
+
+
+def test_delta_and_migrated_threads_do_not_cross_contaminate() -> None:
+    """Two threads sharing a checkpointer — one migrated from
+    pre-migration state, one freshly-started under DeltaChannel — must
+    maintain independent state. The parent-chain walk in
+    `_get_channel_writes_history` must be scoped to the target thread.
+    """
+
+    checkpointer = InMemorySaver()
+    migrated_cfg = {"configurable": {"thread_id": "migrated"}}
+    fresh_cfg = {"configurable": {"thread_id": "fresh"}}
+
+    # Thread A: pre-migration build-up.
+    binop = _binop_graph(checkpointer)
+    _drive(binop, migrated_cfg, "m", 2)
+
+    # Thread B: fresh delta-channel run.
+    delta = _delta_graph(checkpointer)
+    _drive(delta, fresh_cfg, "f", 2)
+
+    # Thread A: migrate and confirm its state is anchored in its own
+    # thread's pre-migration history (tag 'm'), never mixing in tag 'f'.
+    migrated_boundaries = _settled_boundaries(
+        list(delta.get_state_history(migrated_cfg))
+    )
+    assert migrated_boundaries, "migrated thread has no settled boundaries"
+    for _, items in migrated_boundaries:
+        for it in items:
+            assert it.startswith("m"), (
+                f"migrated thread leaked item from other thread: {it}"
+            )
+
+    # Thread B: settled boundaries must only contain 'f' tags.
+    fresh_boundaries = _settled_boundaries(list(delta.get_state_history(fresh_cfg)))
+    assert fresh_boundaries, "fresh thread has no settled boundaries"
+    for _, items in fresh_boundaries:
+        for it in items:
+            assert it.startswith("f"), (
+                f"fresh thread leaked item from migrated thread: {it}"
+            )
+
+
+# ---------------------------------------------------------------------------
+# 6. Tip-of-pre-migration hydration: the latest checkpoint from a binop-run
+# thread has a real accumulated value in its own `channel_values["items"]`.
+# When hydrated under the delta-channel graph via `get_state(config)` with no
+# `checkpoint_id`, the short-circuit must use that value directly instead of
+# walking ancestors (which would skip the tip's own blob).
+# ---------------------------------------------------------------------------
+
+
+def test_tip_of_pre_migration_hydrates_directly() -> None:
+    """`graph.get_state(config)` at the latest (pre-migration) checkpoint
+    returns the full accumulated list stored in that checkpoint's own
+    `channel_values`. The hydration must not walk ancestors past it."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "tip-sync"}}
+
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 3)
+
+    binop_tip = binop.get_state(config)
+    expected_items = list(binop_tip.values.get("items", []))
+    assert expected_items == ["u0", "u1", "u2"], (
+        f"sanity: pre-migration tip should accumulate all 3 items, got {expected_items}"
+    )
+
+    delta = _delta_graph(checkpointer)
+
+    snap = delta.get_state(config)
+    assert list(snap.values.get("items", [])) == expected_items, (
+        f"tip hydration mismatch: expected {expected_items}, "
+        f"got {snap.values.get('items', [])}"
+    )
+
+
+async def test_tip_of_pre_migration_hydrates_directly_async() -> None:
+    """Async variant of the tip-of-pre-migration hydration scenario."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "tip-async"}}
+
+    binop = _binop_graph(checkpointer)
+    await _adrive(binop, config, "u", 3)
+
+    binop_tip = await binop.aget_state(config)
+    expected_items = list(binop_tip.values.get("items", []))
+    assert expected_items == ["u0", "u1", "u2"]
+
+    delta = _delta_graph(checkpointer)
+
+    snap = await delta.aget_state(config)
+    assert list(snap.values.get("items", [])) == expected_items, (
+        f"async tip hydration mismatch: expected {expected_items}, "
+        f"got {snap.values.get('items', [])}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# 7. `update_state` after migration writes a real value to the new
+# checkpoint's `channel_values` (not a sentinel). Hydration must use it
+# directly — the ancestor walk would skip this blob and return stale state.
+# ---------------------------------------------------------------------------
+
+
+def test_update_state_after_migration_uses_written_value() -> None:
+    """After migrating and running at least one post-migration super-step
+    (so the thread's tip has a `DELTA_SENTINEL`), `update_state` writes a
+    concrete value to a new checkpoint's `channel_values`. `get_state`
+    must reflect that concrete value."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "update-state"}}
+
+    # Pre-migration: accumulate a little state.
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 2)
+
+    # Migrate and run one more super-step so the tip is a post-migration
+    # checkpoint with `DELTA_SENTINEL` in its own `channel_values`.
+    delta = _delta_graph(checkpointer)
+    delta.invoke({"items": ["post"]}, config)
+
+    # `update_state` writes a concrete value into a new checkpoint's blob
+    # via the reducer against the hydrated prior state.
+    delta.update_state(config, {"items": ["x", "y"]})
+
+    snap = delta.get_state(config)
+    updated_items = list(snap.values.get("items", []))
+    # Must include the "x","y" update; without the hydration fix, the
+    # update_state-written blob would be skipped in favor of an ancestor
+    # walk, and the update values would disappear.
+    assert "x" in updated_items and "y" in updated_items, (
+        f"update_state values missing from snapshot: {updated_items}"
+    )
+    # The "x","y" items should be folded onto the prior accumulated state,
+    # not stand alone. This verifies the update-written blob is used
+    # directly by `get_state` (no ancestor walk past it).
+    assert len(updated_items) >= 4, (
+        f"update_state snapshot should preserve pre-update state, got {updated_items}"
+    )
+    assert updated_items[-2:] == ["x", "y"], (
+        f"update_state deltas should be at the tail, got {updated_items}"
+    )
+
+
+# ---------------------------------------------------------------------------
+# 8. Fork from an `update_state` checkpoint: a new run branched off the
+# update_state-produced checkpoint must see that checkpoint's concrete
+# `channel_values` as its base, with new deltas folded on top.
+# ---------------------------------------------------------------------------
+
+
+def test_fork_from_update_state_checkpoint() -> None:
+    """Branching a new run from the checkpoint produced by `update_state`
+    must use that checkpoint's concrete blob as the base. Additional
+    deltas from the forked run fold onto it through the reducer."""
+
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "fork"}}
+
+    # Pre-migration build-up, then migrate and add one post-migration step.
+    binop = _binop_graph(checkpointer)
+    _drive(binop, config, "u", 2)
+    delta = _delta_graph(checkpointer)
+    delta.invoke({"items": ["post"]}, config)
+
+    # Apply `update_state` and capture the returned config (references
+    # the new checkpoint produced by the update).
+    update_cfg = delta.update_state(config, {"items": ["x", "y"]})
+
+    update_snap = delta.get_state(update_cfg)
+    base_items = list(update_snap.values.get("items", []))
+    assert "x" in base_items and "y" in base_items, (
+        f"update_state values missing from snapshot: {base_items}"
+    )
+    assert base_items[-2:] == ["x", "y"], (
+        f"sanity: update_state deltas should be at the tail, got {base_items}"
+    )
+
+    # Fork: invoke from the update_state checkpoint with a new delta.
+    forked = delta.invoke({"items": ["fork0"]}, update_cfg)
+    forked_items = list(forked.get("items", []))
+    # The fork must see the update_state-written blob as its base (not
+    # walk past it), and the new delta must fold on top of it.
+    assert forked_items[: len(base_items)] == base_items, (
+        f"fork lost update_state base: base={base_items}, forked={forked_items}"
+    )
+    assert forked_items[-1] == "fork0", f"fork delta not appended: {forked_items}"
+
+
+# ---------------------------------------------------------------------------
+# 9. Migration from `add_messages` → `DeltaChannel(_messages_delta_reducer)`
+#
+# `add_messages` is the primary real-world use case: it creates a
+# BinaryOperatorAggregate with dedup-by-ID and RemoveMessage semantics.
+# After swapping the annotation to DeltaChannel, pre-migration blobs
+# (plain lists of Message objects) must be used directly as the seed.
+# ---------------------------------------------------------------------------
+
+
+def _add_messages_graph(checkpointer: Any) -> Any:
+    class MessagesState(TypedDict):
+        messages: Annotated[list, add_messages]
+
+    return (
+        StateGraph(MessagesState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _delta_messages_graph(checkpointer: Any) -> Any:
+    class DeltaMessagesState(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    return (
+        StateGraph(DeltaMessagesState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def test_add_messages_to_delta_migration_preserves_message_history() -> None:
+    """Migration from `add_messages` to `DeltaChannel(_messages_delta_reducer)`
+    preserves message ordering and IDs at both the tip and settled ancestor
+    boundaries.
+
+    The pre-migration blob is a plain list of Message objects; DeltaChannel
+    must use it directly as the seed without walking ancestors past it.
+    """
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "add-messages-migration"}}
+
+    pre_graph = _add_messages_graph(checkpointer)
+    pre_graph.invoke({"messages": [HumanMessage(content="hello", id="h1")]}, config)
+    pre_graph.invoke({"messages": [AIMessage(content="hi", id="a1")]}, config)
+    pre_graph.invoke({"messages": [HumanMessage(content="thanks", id="h2")]}, config)
+
+    pre_tip = pre_graph.get_state(config)
+    assert [m.id for m in pre_tip.values["messages"]] == ["h1", "a1", "h2"]
+
+    delta_graph = _delta_messages_graph(checkpointer)
+
+    # Tip: latest checkpoint has a full list blob — must use it directly.
+    snap = delta_graph.get_state(config)
+    assert [m.id for m in snap.values["messages"]] == ["h1", "a1", "h2"], (
+        f"tip hydration mismatch: got {[m.id for m in snap.values['messages']]}"
+    )
+
+    # Settled ancestor boundaries must also match.
+    pre_settled = [
+        [m.id for m in s.values.get("messages", [])]
+        for s in pre_graph.get_state_history(config)
+        if s.next == ("__start__",)
+    ]
+    delta_settled = [
+        [m.id for m in s.values.get("messages", [])]
+        for s in delta_graph.get_state_history(config)
+        if s.next == ("__start__",)
+    ]
+    assert delta_settled == pre_settled, (
+        f"settled boundary mismatch after migration: "
+        f"pre={pre_settled}, delta={delta_settled}"
+    )
+
+
+async def test_add_messages_to_delta_migration_preserves_message_history_async() -> (
+    None
+):
+    """Async variant of the add_messages migration test."""
+    checkpointer = InMemorySaver()
+    config = {"configurable": {"thread_id": "add-messages-migration-async"}}
+
+    pre_graph = _add_messages_graph(checkpointer)
+    await pre_graph.ainvoke(
+        {"messages": [HumanMessage(content="hello", id="h1")]}, config
+    )
+    await pre_graph.ainvoke({"messages": [AIMessage(content="hi", id="a1")]}, config)
+
+    delta_graph = _delta_messages_graph(checkpointer)
+    snap = await delta_graph.aget_state(config)
+    assert [m.id for m in snap.values["messages"]] == ["h1", "a1"], (
+        f"async tip hydration mismatch: got {[m.id for m in snap.values['messages']]}"
+    )

libs/langgraph/tests/test_graph_callbacks.py

@@ -0,0 +1,344 @@
+from __future__ import annotations
+
+import sys
+from typing import Any
+
+import pytest
+from langchain_core.callbacks.base import BaseCallbackHandler
+from langchain_core.callbacks.manager import CallbackManager
+from langgraph.checkpoint.memory import InMemorySaver
+from typing_extensions import TypedDict
+
+from langgraph.callbacks import (
+    GraphCallbackHandler,
+    GraphInterruptEvent,
+    GraphResumeEvent,
+)
+from langgraph.graph import START, StateGraph
+from langgraph.types import Command, Interrupt, interrupt
+
+NEEDS_CONTEXTVARS = pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
+
+
+class _GraphEventHandler(GraphCallbackHandler):
+    def __init__(self) -> None:
+        self.interrupt_events: list[GraphInterruptEvent] = []
+        self.resume_events: list[GraphResumeEvent] = []
+
+    def on_interrupt(self, event: GraphInterruptEvent) -> Any:
+        self.interrupt_events.append(event)
+
+    def on_resume(self, event: GraphResumeEvent) -> Any:
+        self.resume_events.append(event)
+
+
+class _LangChainCustomEventHandler(BaseCallbackHandler):
+    run_inline = True
+
+    def __init__(self) -> None:
+        self.events: list[str] = []
+
+    def on_custom_event(self, name: str, data: Any, **kwargs: Any) -> Any:
+        self.events.append(name)
+
+
+class _RaisingGraphEventHandler(GraphCallbackHandler):
+    def __init__(
+        self,
+        *,
+        raise_on_interrupt: bool = False,
+        raise_on_resume: bool = False,
+        raise_error: bool = False,
+    ) -> None:
+        self.raise_on_interrupt = raise_on_interrupt
+        self.raise_on_resume = raise_on_resume
+        self.raise_error = raise_error
+
+    def on_interrupt(self, event: GraphInterruptEvent) -> Any:
+        if self.raise_on_interrupt:
+            raise ValueError("boom-interrupt")
+
+    def on_resume(self, event: GraphResumeEvent) -> Any:
+        if self.raise_on_resume:
+            raise ValueError("boom-resume")
+
+
+class _AsyncRaisingGraphEventHandler(GraphCallbackHandler):
+    def __init__(
+        self,
+        *,
+        raise_on_interrupt: bool = False,
+        raise_on_resume: bool = False,
+        raise_error: bool = False,
+    ) -> None:
+        self.raise_on_interrupt = raise_on_interrupt
+        self.raise_on_resume = raise_on_resume
+        self.raise_error = raise_error
+
+    async def on_interrupt(self, event: GraphInterruptEvent) -> Any:
+        if self.raise_on_interrupt:
+            raise ValueError("boom-interrupt")
+
+    async def on_resume(self, event: GraphResumeEvent) -> Any:
+        if self.raise_on_resume:
+            raise ValueError("boom-resume")
+
+
+class _State(TypedDict):
+    answer: str | None
+
+
+def _build_interrupt_graph() -> Any:
+    def ask(state: _State) -> _State:
+        answer = interrupt("Provide value")
+        return {"answer": answer}
+
+    builder = StateGraph(_State)
+    builder.add_node("ask", ask)
+    builder.add_edge(START, "ask")
+    return builder.compile(checkpointer=InMemorySaver())
+
+
+def test_graph_callbacks_interrupt_and_resume_sync() -> None:
+    graph = _build_interrupt_graph()
+    handler = _GraphEventHandler()
+    langchain_handler = _LangChainCustomEventHandler()
+    config = {
+        "configurable": {"thread_id": "graph-callback-sync"},
+        "callbacks": [langchain_handler, handler],
+    }
+
+    first = graph.invoke({"answer": None}, config)
+    assert "__interrupt__" in first
+
+    assert len(handler.interrupt_events) == 1
+    assert handler.interrupt_events[0].interrupts
+    assert isinstance(handler.interrupt_events[0].interrupts[0], Interrupt)
+    assert handler.interrupt_events[0].checkpoint_ns == ()
+    assert langchain_handler.events == []
+
+    handler.resume_events.clear()
+    resumed = graph.invoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+
+    assert len(handler.resume_events) == 1
+    assert handler.resume_events[0].checkpoint_ns == ()
+    assert langchain_handler.events == []
+
+
+@pytest.mark.anyio
+@NEEDS_CONTEXTVARS
+async def test_graph_callbacks_interrupt_and_resume_async() -> None:
+    graph = _build_interrupt_graph()
+    handler = _GraphEventHandler()
+    langchain_handler = _LangChainCustomEventHandler()
+    config = {
+        "configurable": {"thread_id": "graph-callback-async"},
+        "callbacks": [langchain_handler, handler],
+    }
+
+    first = await graph.ainvoke({"answer": None}, config)
+    assert "__interrupt__" in first
+
+    assert len(handler.interrupt_events) == 1
+    assert handler.interrupt_events[0].interrupts
+    assert isinstance(handler.interrupt_events[0].interrupts[0], Interrupt)
+    assert handler.interrupt_events[0].checkpoint_ns == ()
+    assert langchain_handler.events == []
+
+    handler.resume_events.clear()
+    resumed = await graph.ainvoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+
+    assert len(handler.resume_events) == 1
+    assert handler.resume_events[0].checkpoint_ns == ()
+    assert langchain_handler.events == []
+
+
+def test_graph_callbacks_continue_when_interrupt_handler_raises_sync() -> None:
+    graph = _build_interrupt_graph()
+    raising_handler = _RaisingGraphEventHandler(raise_on_interrupt=True)
+    recording_handler = _GraphEventHandler()
+
+    first = graph.invoke(
+        {"answer": None},
+        {
+            "configurable": {"thread_id": "graph-callback-sync-raises"},
+            "callbacks": [raising_handler, recording_handler],
+        },
+    )
+
+    assert "__interrupt__" in first
+    assert len(recording_handler.interrupt_events) == 1
+
+
+def test_graph_callbacks_continue_when_resume_handler_raises_sync() -> None:
+    graph = _build_interrupt_graph()
+    raising_handler = _RaisingGraphEventHandler(raise_on_resume=True)
+    recording_handler = _GraphEventHandler()
+    config = {
+        "configurable": {"thread_id": "graph-callback-sync-raises-resume"},
+        "callbacks": [raising_handler, recording_handler],
+    }
+
+    first = graph.invoke({"answer": None}, config)
+    assert "__interrupt__" in first
+
+    resumed = graph.invoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+    assert len(recording_handler.resume_events) == 1
+
+
+def test_graph_callbacks_raise_error_propagates_sync() -> None:
+    graph = _build_interrupt_graph()
+    raising_handler = _RaisingGraphEventHandler(
+        raise_on_interrupt=True,
+        raise_error=True,
+    )
+
+    with pytest.raises(ValueError, match="boom-interrupt"):
+        graph.invoke(
+            {"answer": None},
+            {
+                "configurable": {"thread_id": "graph-callback-sync-raise-error"},
+                "callbacks": [raising_handler],
+            },
+        )
+
+
+@pytest.mark.anyio
+@NEEDS_CONTEXTVARS
+async def test_graph_callbacks_continue_when_handler_raises_async() -> None:
+    graph = _build_interrupt_graph()
+    raising_interrupt_handler = _AsyncRaisingGraphEventHandler(raise_on_interrupt=True)
+    recording_handler = _GraphEventHandler()
+    config = {
+        "configurable": {"thread_id": "graph-callback-async-raises-interrupt"},
+        "callbacks": [raising_interrupt_handler, recording_handler],
+    }
+
+    first = await graph.ainvoke({"answer": None}, config)
+    assert "__interrupt__" in first
+    assert len(recording_handler.interrupt_events) == 1
+
+    graph = _build_interrupt_graph()
+    raising_resume_handler = _AsyncRaisingGraphEventHandler(raise_on_resume=True)
+    recording_handler = _GraphEventHandler()
+    config = {
+        "configurable": {"thread_id": "graph-callback-async-raises-resume"},
+        "callbacks": [raising_resume_handler, recording_handler],
+    }
+
+    first = await graph.ainvoke({"answer": None}, config)
+    assert "__interrupt__" in first
+    resumed = await graph.ainvoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+    assert len(recording_handler.resume_events) == 1
+
+
+@pytest.mark.anyio
+@NEEDS_CONTEXTVARS
+async def test_graph_callbacks_raise_error_propagates_async() -> None:
+    graph = _build_interrupt_graph()
+    raising_handler = _AsyncRaisingGraphEventHandler(
+        raise_on_interrupt=True,
+        raise_error=True,
+    )
+
+    with pytest.raises(ValueError, match="boom-interrupt"):
+        await graph.ainvoke(
+            {"answer": None},
+            {
+                "configurable": {"thread_id": "graph-callback-async-raise-error"},
+                "callbacks": [raising_handler],
+            },
+        )
+
+
+def test_graph_callbacks_accept_base_callback_manager() -> None:
+    graph = _build_interrupt_graph()
+    graph_handler = _GraphEventHandler()
+    custom_handler = _LangChainCustomEventHandler()
+    manager = CallbackManager.configure(inheritable_callbacks=[custom_handler])
+    manager.add_handler(graph_handler)
+
+    first = graph.invoke(
+        {"answer": None},
+        {
+            "configurable": {"thread_id": "graph-callback-base-manager"},
+            "callbacks": manager,
+        },
+    )
+
+    assert "__interrupt__" in first
+    assert len(graph_handler.interrupt_events) == 1
+
+
+def test_non_graph_handler_via_add_handler_does_not_crash() -> None:
+    """Non-GraphCallbackHandler added via add_handler should not raise.
+
+    Libraries like opentelemetry-instrumentation-langchain monkey-patch
+    BaseCallbackManager.__init__ and inject handlers via add_handler().
+    These handlers inherit from BaseCallbackHandler, not
+    GraphCallbackHandler. They must be silently accepted — graph lifecycle
+    events will simply not be dispatched to them.
+    """
+    from langgraph.callbacks import _GraphCallbackManager
+
+    manager = _GraphCallbackManager()
+    plain_handler = _LangChainCustomEventHandler()
+
+    manager.add_handler(plain_handler, inherit=True)
+    assert plain_handler in manager.handlers
+
+
+def test_non_graph_handler_does_not_receive_lifecycle_events() -> None:
+    """Non-GraphCallbackHandler added alongside a GraphCallbackHandler
+    should not interfere with lifecycle event dispatch."""
+    graph = _build_interrupt_graph()
+    graph_handler = _GraphEventHandler()
+    plain_handler = _LangChainCustomEventHandler()
+
+    config = {
+        "configurable": {"thread_id": "graph-callback-mixed-handlers"},
+        "callbacks": [plain_handler, graph_handler],
+    }
+
+    first = graph.invoke({"answer": None}, config)
+    assert "__interrupt__" in first
+
+    assert len(graph_handler.interrupt_events) == 1
+    assert plain_handler.events == []
+
+    resumed = graph.invoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+    assert len(graph_handler.resume_events) == 1
+    assert plain_handler.events == []
+
+
+@pytest.mark.anyio
+@NEEDS_CONTEXTVARS
+async def test_non_graph_handler_does_not_receive_lifecycle_events_async() -> None:
+    """Async variant: non-GraphCallbackHandler should not interfere."""
+    graph = _build_interrupt_graph()
+    graph_handler = _GraphEventHandler()
+    plain_handler = _LangChainCustomEventHandler()
+
+    config = {
+        "configurable": {"thread_id": "graph-callback-mixed-handlers-async"},
+        "callbacks": [plain_handler, graph_handler],
+    }
+
+    first = await graph.ainvoke({"answer": None}, config)
+    assert "__interrupt__" in first
+
+    assert len(graph_handler.interrupt_events) == 1
+    assert plain_handler.events == []
+
+    resumed = await graph.ainvoke(Command(resume="done"), config)
+    assert resumed == {"answer": "done"}
+    assert len(graph_handler.resume_events) == 1
+    assert plain_handler.events == []

libs/langgraph/tests/test_large_cases.py

@@ -1396,7 +1396,6 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -1459,7 +1458,6 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -1512,7 +1510,6 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -6884,7 +6881,6 @@ def test_weather_subgraph(
                     "langgraph_path": ("__pregel_pull", "router_node"),
                     "langgraph_checkpoint_ns": AnyStr("router_node:"),
                     "checkpoint_ns": AnyStr("router_node:"),
-                    "_type": "fake-messages-list-chat-model",
                     "ls_provider": "fakemessageslistchatmodel",
                     "ls_model_type": "chat",
                     "ls_integration": "langchain_chat_model",
@@ -6912,7 +6908,6 @@ def test_weather_subgraph(
                     "langgraph_path": ("__pregel_pull", "model_node"),
                     "langgraph_checkpoint_ns": AnyStr("weather_graph:"),
                     "checkpoint_ns": AnyStr("weather_graph:"),
-                    "_type": "fake-messages-list-chat-model",
                     "ls_provider": "fakemessageslistchatmodel",
                     "ls_model_type": "chat",
                     "ls_integration": "langchain_chat_model",
@@ -6949,7 +6944,6 @@ def test_weather_subgraph(
                 "langgraph_path": ("__pregel_pull", "router_node"),
                 "langgraph_checkpoint_ns": AnyStr("router_node:"),
                 "checkpoint_ns": AnyStr("router_node:"),
-                "_type": "fake-messages-list-chat-model",
                 "ls_provider": "fakemessageslistchatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",

libs/langgraph/tests/test_large_cases_async.py

@@ -1147,7 +1147,6 @@ async def test_prebuilt_tool_chat() -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -1210,7 +1209,6 @@ async def test_prebuilt_tool_chat() -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -1263,7 +1261,6 @@ async def test_prebuilt_tool_chat() -> None:
                 "langgraph_path": (PULL, "agent"),
                 "langgraph_checkpoint_ns": AnyStr("agent:"),
                 "checkpoint_ns": AnyStr("agent:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "fakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -3981,7 +3978,6 @@ async def test_weather_subgraph(
                     "langgraph_path": ("__pregel_pull", "router_node"),
                     "langgraph_checkpoint_ns": AnyStr("router_node:"),
                     "checkpoint_ns": AnyStr("router_node:"),
-                    "_type": "fake-messages-list-chat-model",
                     "ls_provider": "fakemessageslistchatmodel",
                     "ls_model_type": "chat",
                     "ls_integration": "langchain_chat_model",
@@ -4009,7 +4005,6 @@ async def test_weather_subgraph(
                     "langgraph_path": ("__pregel_pull", "model_node"),
                     "langgraph_checkpoint_ns": AnyStr("weather_graph:"),
                     "checkpoint_ns": AnyStr("weather_graph:"),
-                    "_type": "fake-messages-list-chat-model",
                     "ls_provider": "fakemessageslistchatmodel",
                     "ls_model_type": "chat",
                     "ls_integration": "langchain_chat_model",
@@ -4046,7 +4041,6 @@ async def test_weather_subgraph(
                 "langgraph_path": ("__pregel_pull", "router_node"),
                 "langgraph_checkpoint_ns": AnyStr("router_node:"),
                 "checkpoint_ns": AnyStr("router_node:"),
-                "_type": "fake-messages-list-chat-model",
                 "ls_provider": "fakemessageslistchatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",

libs/langgraph/tests/test_pregel.py

@@ -16,7 +16,7 @@ from typing import Annotated, Any, Literal, get_type_hints
 
 import pytest
 from langchain_core.language_models import GenericFakeChatModel
-from langchain_core.messages import AIMessage, AnyMessage, HumanMessage
+from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, RemoveMessage
 from langchain_core.runnables import (
     RunnableConfig,
     RunnableLambda,
@@ -25,6 +25,7 @@ from langchain_core.runnables import (
 from langchain_core.runnables.graph import Edge
 from langgraph.cache.base import BaseCache
 from langgraph.checkpoint.base import (
+    DELTA_SENTINEL,
     BaseCheckpointSaver,
     Checkpoint,
     CheckpointMetadata,
@@ -41,6 +42,7 @@ from typing_extensions import NotRequired, TypedDict
 
 from langgraph._internal._constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL
 from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.topic import Topic
@@ -49,7 +51,7 @@ from langgraph.config import get_stream_writer
 from langgraph.errors import GraphRecursionError, InvalidUpdateError, ParentCommand
 from langgraph.func import entrypoint, task
 from langgraph.graph import END, START, StateGraph
-from langgraph.graph.message import MessagesState, add_messages
+from langgraph.graph.message import MessagesState, _messages_delta_reducer, add_messages
 from langgraph.pregel import (
     NodeBuilder,
     Pregel,
@@ -615,8 +617,11 @@ def test_run_from_checkpoint_id_retains_previous_writes(
         )
     ]
 
-    assert len(new_history) == len(history) + 1
-    for original, new in zip(history, new_history[1:]):
+    # +2: one fork checkpoint from time travel, one from the new execution
+    assert len(new_history) == len(history) + 2
+    # new_history[0] is the new execution result, new_history[1] is the fork
+    assert new_history[1].metadata["source"] == "fork"
+    for original, new in zip(history, new_history[2:]):
         assert original.values == new.values
         assert original.next == new.next
         assert original.metadata["step"] == new.metadata["step"]
@@ -624,7 +629,7 @@ def test_run_from_checkpoint_id_retains_previous_writes(
     def _get_tasks(hist: list, start: int):
         return [h.tasks for h in hist[start:]]
 
-    assert _get_tasks(new_history, 1) == _get_tasks(history, 0)
+    assert _get_tasks(new_history, 2) == _get_tasks(history, 0)
 
 
 def test_batch_two_processes_in_out() -> None:
@@ -1329,20 +1334,22 @@ def test_imp_nested(
     }
 
     thread1 = {"configurable": {"thread_id": "1"}}
-    assert [*graph.stream([0, 1], thread1, durability=durability)] == [
-        {"submapper": "0"},
+    result = [*graph.stream([0, 1], thread1, durability=durability)]
+    # nested tasks run concurrently so output order is non-deterministic
+    assert sorted(result[:-1], key=lambda d: str(d)) == [
         {"mapper": "00"},
-        {"submapper": "1"},
         {"mapper": "11"},
-        {
-            "__interrupt__": (
-                Interrupt(
-                    value="question",
-                    id=AnyStr(),
-                ),
-            )
-        },
+        {"submapper": "0"},
+        {"submapper": "1"},
     ]
+    assert result[-1] == {
+        "__interrupt__": (
+            Interrupt(
+                value="question",
+                id=AnyStr(),
+            ),
+        )
+    }
 
     assert graph.invoke(Command(resume="answer"), thread1, durability=durability) == [
         "00answera",
@@ -6269,7 +6276,7 @@ def test_sync_streaming_with_functional_api() -> None:
     @task()
     def slow() -> dict:
         time.sleep(time_delay)  # Simulate a delay of 10 ms
-        return {"tic": time.time()}
+        return {"tic": time.monotonic()}
 
     @entrypoint()
     def graph(inputs: dict) -> list:
@@ -6282,7 +6289,7 @@ def test_sync_streaming_with_functional_api() -> None:
     for chunk in graph.stream({}):
         if "slow" not in chunk:  # We'll just look at the updates from `slow`
             continue
-        arrival_times.append(time.time())
+        arrival_times.append(time.monotonic())
 
     assert len(arrival_times) == 2
     delta = arrival_times[1] - arrival_times[0]
@@ -6891,7 +6898,6 @@ def test_tags_stream_mode_messages() -> None:
                 "langgraph_path": ("__pregel_pull", "call_model"),
                 "langgraph_checkpoint_ns": AnyStr("call_model:"),
                 "checkpoint_ns": AnyStr("call_model:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "genericfakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -6901,6 +6907,60 @@ def test_tags_stream_mode_messages() -> None:
     ]
 
 
+def test_configurable_propagates_to_stream_metadata() -> None:
+    """Regression: thread_id, run_id, assistant_id, graph_id,
+    and langgraph_auth_user_id from configurable must appear
+    in stream_mode='messages' metadata."""
+
+    def my_node(state):
+        return {"messages": HumanMessage(content="hello")}
+
+    graph = (
+        StateGraph(MessagesState)
+        .add_node("my_node", my_node)
+        .add_edge(START, "my_node")
+        .compile()
+    )
+
+    config = {
+        "configurable": {
+            "thread_id": "th-123",
+            "checkpoint_id": "ckpt-1",
+            "checkpoint_ns": "ns-1",
+            "task_id": "task-1",
+            "run_id": "run-456",
+            "assistant_id": "asst-789",
+            "graph_id": "graph-0",
+            "model": "gpt-4o",
+            "user_id": "uid-1",
+            "cron_id": "cron-1",
+            "langgraph_auth_user_id": "user-1",
+            # these should NOT be propagated into metadata
+            "some_api_key": "secret",
+            "custom_setting": {"nested": True},
+        },
+    }
+    results = list(graph.stream({"messages": []}, config, stream_mode="messages"))
+    assert len(results) == 1
+    _, metadata = results[0]
+    # propagated keys
+    assert metadata["thread_id"] == "th-123"
+    assert metadata["checkpoint_id"] == "ckpt-1"
+    assert metadata["checkpoint_ns"] == "ns-1"
+    assert metadata["task_id"] == "task-1"
+    assert metadata["run_id"] == "run-456"
+    assert metadata["assistant_id"] == "asst-789"
+    assert metadata["graph_id"] == "graph-0"
+    # These are only present in trace metadata by default as of langgraph 1.2
+    # assert metadata["model"] == "gpt-4o"
+    # assert metadata["user_id"] == "uid-1"
+    # assert metadata["cron_id"] == "cron-1"
+    # assert metadata["langgraph_auth_user_id"] == "user-1"
+    # non-allowlisted keys must not appear
+    assert "some_api_key" not in metadata
+    assert "custom_setting" not in metadata
+
+
 def test_stream_mode_messages_command() -> None:
     from langchain_core.messages import HumanMessage
 
@@ -9342,3 +9402,254 @@ def test_fork_does_not_apply_pending_writes(
 
     # Should be: 1 (input) + 20 (forked node_a) + 100 (node_b) = 121
     assert result == {"value": 121}
+
+
+async def test_delta_channel_end_to_end_inmemory() -> None:
+    """Full graph run: DeltaChannel accumulates correctly across multiple turns."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        n = len(state["messages"])
+        return {"messages": [AIMessage(content=f"reply-{n}", id=f"ai-{n}")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+    graph = builder.compile(checkpointer=InMemorySaver())
+
+    config = {"configurable": {"thread_id": "diff-test-1"}}
+
+    # Turn 1
+    graph.invoke({"messages": [HumanMessage(content="hello", id="h1")]}, config)
+    # Turn 2
+    graph.invoke({"messages": [HumanMessage(content="world", id="h2")]}, config)
+    # Turn 3
+    graph.invoke({"messages": [HumanMessage(content="bye", id="h3")]}, config)
+
+    state = graph.get_state(config)
+    msgs = state.values["messages"]
+    # 3 human + 3 AI = 6 total
+    assert len(msgs) == 6, f"expected 6 messages, got {len(msgs)}: {msgs}"
+    assert msgs[0].content == "hello"
+    assert msgs[2].content == "world"
+    assert msgs[4].content == "bye"
+    assert msgs[1].content == "reply-1"
+    assert msgs[3].content == "reply-3"
+    assert msgs[5].content == "reply-5"
+
+
+async def test_delta_channel_time_travel() -> None:
+    """Time-travel back to turn-1 checkpoint and resume; continuation must not include turn-2 deltas."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    counter = {"n": 0}
+
+    def respond(state: State) -> dict:
+        counter["n"] += 1
+        return {
+            "messages": [
+                AIMessage(content=f"ai-{counter['n']}", id=f"ai-{counter['n']}")
+            ]
+        }
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+    saver = InMemorySaver()
+    graph = builder.compile(checkpointer=saver)
+
+    config = {"configurable": {"thread_id": "diff-time-travel"}}
+
+    # Run 2 turns: h1→ai-1, h2→ai-2
+    graph.invoke({"messages": [HumanMessage(content="h1", id="h1")]}, config)
+    graph.invoke({"messages": [HumanMessage(content="h2", id="h2")]}, config)
+
+    # Find the checkpoint after turn 1 (2 messages: h1 + ai-1)
+    history = list(graph.get_state_history(config))
+    after_turn1 = next(h for h in history if len(h.values.get("messages", [])) == 2)
+
+    assert len(after_turn1.values["messages"]) == 2
+    assert after_turn1.values["messages"][0].content == "h1"
+    assert after_turn1.values["messages"][1].content == "ai-1"
+
+    # Resume from turn-1 checkpoint: inject h3, expect 3 messages total (h1, ai-1, ai-N)
+    # NOT 5 messages (turn-2 deltas must not bleed into the resumed run)
+    result = graph.invoke(
+        {"messages": [HumanMessage(content="h3", id="h3")]},
+        after_turn1.config,
+    )
+    msgs = result["messages"]
+    # Should be: h1, ai-1, h3, ai-N — 4 messages total
+    assert len(msgs) == 4, (
+        f"expected 4 messages after time-travel resume, got {len(msgs)}: {msgs}"
+    )
+    assert msgs[0].content == "h1"
+    assert msgs[1].content == "ai-1"
+    assert msgs[2].content == "h3"
+
+
+async def test_delta_channel_remove_message_end_to_end() -> None:
+    """RemoveMessage inside a DeltaChannel graph must persist and reload correctly."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        return {"messages": [AIMessage(content="reply", id="ai-1")]}
+
+    def delete_first(state: State) -> dict:
+        # removes the first message
+        return {"messages": [RemoveMessage(id=state["messages"][0].id)]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_node("delete_first", delete_first)
+    builder.add_edge(START, "respond")
+    builder.add_edge("respond", "delete_first")
+    graph = builder.compile(checkpointer=InMemorySaver())
+
+    config = {"configurable": {"thread_id": "diff-remove-test"}}
+    graph.invoke({"messages": [HumanMessage(content="hello", id="h1")]}, config)
+
+    state = graph.get_state(config)
+    msgs = state.values["messages"]
+    # h1 was removed, only ai-1 should remain
+    assert len(msgs) == 1, f"expected 1 message, got {len(msgs)}: {msgs}"
+    assert msgs[0].id == "ai-1"
+
+    # A subsequent turn must reconstruct from the checkpoint correctly
+    graph.invoke({"messages": [HumanMessage(content="again", id="h2")]}, config)
+    state = graph.get_state(config)
+    msgs = state.values["messages"]
+    # ai-1 + h2 + ai-1(second reply, same id overwrites) + h2 removed
+    # more simply: after second run we expect ai-1 updated + h2 remaining minus deleted h2
+    # just assert h1 is still gone
+    assert all(m.id != "h1" for m in msgs), (
+        "h1 should still be absent after second turn"
+    )
+
+
+async def test_delta_channel_update_by_id_end_to_end() -> None:
+    """Updating a message by ID via DeltaChannel must persist and reload correctly."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def update_msg(state: State) -> dict:
+        # re-send h1 with updated content
+        return {"messages": [HumanMessage(content="updated", id="h1")]}
+
+    builder = StateGraph(State)
+    builder.add_node("update_msg", update_msg)
+    builder.add_edge(START, "update_msg")
+    graph = builder.compile(checkpointer=InMemorySaver())
+
+    config = {"configurable": {"thread_id": "diff-update-id-test"}}
+    graph.invoke({"messages": [HumanMessage(content="original", id="h1")]}, config)
+
+    state = graph.get_state(config)
+    msgs = state.values["messages"]
+    assert len(msgs) == 1, f"expected 1 message, got {len(msgs)}: {msgs}"
+    assert msgs[0].content == "updated"
+    assert msgs[0].id == "h1"
+
+    # Second turn: verify the updated state is the base for further accumulation
+    graph.invoke({"messages": [HumanMessage(content="new", id="h2")]}, config)
+    state = graph.get_state(config)
+    msgs = state.values["messages"]
+    ids = [m.id for m in msgs]
+    assert "h1" in ids  # h1 persists (updated, not duplicated)
+    assert "h2" in ids
+    assert ids.count("h1") == 1, "h1 must not be duplicated"
+
+
+async def test_delta_channel_durability_exit_stores_snapshot() -> None:
+    """DeltaChannel must reload from a durability='exit' checkpoint."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        return {"messages": [AIMessage(content="reply", id="ai1")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+    graph = builder.compile(checkpointer=InMemorySaver())
+    config = {"configurable": {"thread_id": "delta-exit-test"}}
+
+    result = graph.invoke(
+        {"messages": [HumanMessage(content="hello", id="h1")]},
+        config,
+        durability="exit",
+    )
+    assert [m.content for m in result["messages"]] == ["hello", "reply"]
+
+    state = graph.get_state(config)
+    assert [m.content for m in state.values["messages"]] == ["hello", "reply"]
+
+
+async def test_delta_channel_async_write_ordering() -> None:
+    """In async mode, DeltaChannel write futures are awaited before the checkpoint
+    is committed, so aput_writes always precedes aput for sentinel checkpoints."""
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        i = len(state["messages"])
+        return {"messages": [AIMessage(content=f"r{i}", id=f"ai{i}")]}
+
+    order: list[str] = []
+    original_aput_writes = InMemorySaver.aput_writes
+    original_aput = InMemorySaver.aput
+
+    async def tracked_aput_writes(self, config, writes, task_id, task_path=""):
+        result = await original_aput_writes(self, config, writes, task_id, task_path)
+        order.append("aput_writes")
+        return result
+
+    async def tracked_aput(self, config, checkpoint, metadata, new_versions):
+        has_sentinel = any(
+            v is DELTA_SENTINEL for v in checkpoint.get("channel_values", {}).values()
+        )
+        order.append("aput_sentinel" if has_sentinel else "aput_other")
+        return await original_aput(self, config, checkpoint, metadata, new_versions)
+
+    InMemorySaver.aput_writes = tracked_aput_writes
+    InMemorySaver.aput = tracked_aput
+    try:
+        builder = StateGraph(State)
+        builder.add_node("respond", respond)
+        builder.add_edge(START, "respond")
+        graph = builder.compile(checkpointer=InMemorySaver())
+        config = {"configurable": {"thread_id": "async-ordering-test"}}
+
+        for i in range(3):
+            await graph.ainvoke(
+                {"messages": [HumanMessage(content=f"h{i}", id=f"h{i}")]}, config
+            )
+
+        # Every aput_sentinel must be preceded by at least one aput_writes
+        for i, event in enumerate(order):
+            if event == "aput_sentinel":
+                preceding = order[:i]
+                assert "aput_writes" in preceding, (
+                    f"aput_sentinel at {i} had no preceding aput_writes: {order}"
+                )
+                last_write_idx = max(
+                    j for j, e in enumerate(order[:i]) if e == "aput_writes"
+                )
+                assert last_write_idx < i, (
+                    f"aput_writes at {last_write_idx} should precede aput_sentinel at {i}: {order}"
+                )
+    finally:
+        InMemorySaver.aput_writes = original_aput_writes
+        InMemorySaver.aput = original_aput
+
+    state = await graph.aget_state(config)
+    assert len(state.values["messages"]) == 6  # 3 human + 3 AI

libs/langgraph/tests/test_pregel_async.py

@@ -20,6 +20,7 @@ from uuid import UUID
 
 import pytest
 from langchain_core.language_models import GenericFakeChatModel
+from langchain_core.messages import HumanMessage
 from langchain_core.runnables import RunnableConfig, RunnableLambda, RunnablePassthrough
 from langchain_core.utils.aiter import aclosing
 from langgraph.cache.base import BaseCache
@@ -2085,8 +2086,11 @@ async def test_run_from_checkpoint_id_retains_previous_writes(
         )
     ]
 
-    assert len(new_history) == len(history) + 1
-    for original, new in zip(history, new_history[1:]):
+    # +2: one fork checkpoint from time travel, one from the new execution
+    assert len(new_history) == len(history) + 2
+    # new_history[0] is the new execution result, new_history[1] is the fork
+    assert new_history[1].metadata["source"] == "fork"
+    for original, new in zip(history, new_history[2:]):
         assert original.values == new.values
         assert original.next == new.next
         assert original.metadata["step"] == new.metadata["step"]
@@ -2094,7 +2098,7 @@ async def test_run_from_checkpoint_id_retains_previous_writes(
     def _get_tasks(hist: list, start: int):
         return [h.tasks for h in hist[start:]]
 
-    assert _get_tasks(new_history, 1) == _get_tasks(history, 0)
+    assert _get_tasks(new_history, 2) == _get_tasks(history, 0)
 
 
 async def test_cond_edge_after_send() -> None:
@@ -6097,6 +6101,36 @@ async def test_parent_command(
     )
 
 
+async def test_delta_channel_durability_exit_stores_snapshot_async() -> None:
+    """DeltaChannel must reload from an async durability='exit' checkpoint."""
+    from langchain_core.messages import AIMessage
+
+    from langgraph.channels.delta import DeltaChannel
+    from langgraph.graph.message import _messages_delta_reducer
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    async def respond(state: State) -> dict:
+        return {"messages": [AIMessage(content="reply", id="ai1")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+    graph = builder.compile(checkpointer=InMemorySaver())
+    config = {"configurable": {"thread_id": "delta-exit-async-test"}}
+
+    result = await graph.ainvoke(
+        {"messages": [HumanMessage(content="hello", id="h1")]},
+        config,
+        durability="exit",
+    )
+    assert [m.content for m in result["messages"]] == ["hello", "reply"]
+
+    state = await graph.aget_state(config)
+    assert [m.content for m in state.values["messages"]] == ["hello", "reply"]
+
+
 @NEEDS_CONTEXTVARS
 async def test_interrupt_subgraph(async_checkpointer: BaseCheckpointSaver) -> None:
     class State(TypedDict):
@@ -7541,7 +7575,6 @@ async def test_tags_stream_mode_messages() -> None:
                 "langgraph_path": ("__pregel_pull", "call_model"),
                 "langgraph_checkpoint_ns": AnyStr("call_model:"),
                 "checkpoint_ns": AnyStr("call_model:"),
-                "_type": "generic-fake-chat-model",
                 "ls_provider": "genericfakechatmodel",
                 "ls_model_type": "chat",
                 "ls_integration": "langchain_chat_model",
@@ -7551,6 +7584,67 @@ async def test_tags_stream_mode_messages() -> None:
     ]
 
 
+async def test_configurable_propagates_to_stream_metadata() -> None:
+    """Regression: thread_id, run_id, assistant_id, graph_id,
+    and langgraph_auth_user_id from configurable must appear
+    in stream_mode='messages' metadata."""
+
+    def my_node(state):
+        return {"messages": HumanMessage(content="hello")}
+
+    graph = (
+        StateGraph(MessagesState)
+        .add_node("my_node", my_node)
+        .add_edge(START, "my_node")
+        .compile()
+    )
+
+    config = {
+        "configurable": {
+            "thread_id": "th-123",
+            "checkpoint_id": "ckpt-1",
+            "checkpoint_ns": "ns-1",
+            "task_id": "task-1",
+            "run_id": "run-456",
+            "assistant_id": "asst-789",
+            "graph_id": "graph-0",
+            "model": "gpt-4o",
+            "user_id": "uid-1",
+            "cron_id": "cron-1",
+            "langgraph_auth_user_id": "user-1",
+            # these should NOT be propagated into metadata
+            "some_api_key": "secret",
+            "custom_setting": {"nested": True},
+        },
+    }
+    results = [
+        chunk
+        async for chunk in graph.astream(
+            {"messages": []}, config, stream_mode="messages"
+        )
+    ]
+    assert len(results) == 1
+    _, metadata = results[0]
+    # propagated keys
+    assert metadata["thread_id"] == "th-123"
+    assert metadata["checkpoint_id"] == "ckpt-1"
+    assert metadata["checkpoint_ns"] == "ns-1"
+    assert metadata["task_id"] == "task-1"
+    assert metadata["run_id"] == "run-456"
+    assert metadata["assistant_id"] == "asst-789"
+    assert metadata["graph_id"] == "graph-0"
+
+    # These will only be traced as of langgraph 1.2 and not present by default in
+    # metadata
+    # assert metadata["model"] == "gpt-4o"
+    # assert metadata["user_id"] == "uid-1"
+    # assert metadata["cron_id"] == "cron-1"
+    # assert metadata["langgraph_auth_user_id"] == "user-1"
+    # non-allowlisted keys must not appear
+    assert "some_api_key" not in metadata
+    assert "custom_setting" not in metadata
+
+
 async def test_stream_mode_messages_command() -> None:
     from langchain_core.messages import HumanMessage
 

libs/langgraph/tests/test_runtime.py

@@ -501,13 +501,13 @@ async def test_execution_info_populated_in_graph_async() -> None:
     assert isinstance(info.node_first_attempt_time, float)
 
 
-def test_server_info_from_metadata() -> None:
-    """server_info is built from assistant_id/graph_id in config metadata."""
+def test_server_info_from_configurable() -> None:
+    """server_info is built from assistant_id/graph_id in config configurable."""
     captured: dict[str, Any] = {}
     compiled = _make_capture_graph(captured)
     compiled.invoke(
         {"message": "hi"},
-        config={"metadata": {"assistant_id": "asst-abc", "graph_id": "my-graph"}},
+        config={"configurable": {"assistant_id": "asst-abc", "graph_id": "my-graph"}},
     )
     si = captured["server_info"]
     assert si is not None
@@ -516,8 +516,8 @@ def test_server_info_from_metadata() -> None:
     assert si.user is None
 
 
-def test_server_info_none_without_metadata() -> None:
-    """server_info is None when no assistant_id/graph_id in metadata."""
+def test_server_info_none_without_configurable() -> None:
+    """server_info is None when no assistant_id/graph_id in configurable."""
     captured: dict[str, Any] = {}
     compiled = _make_capture_graph(captured)
     compiled.invoke({"message": "hi"})
@@ -579,8 +579,11 @@ def test_server_info_user_from_auth_user() -> None:
     compiled.invoke(
         {"message": "hi"},
         config={
-            "configurable": {"langgraph_auth_user": proxy},
-            "metadata": {"assistant_id": "asst-proxy", "graph_id": "graph-proxy"},
+            "configurable": {
+                "langgraph_auth_user": proxy,
+                "assistant_id": "asst-proxy",
+                "graph_id": "graph-proxy",
+            },
         },
     )
     si = captured["server_info"]

libs/langgraph/tests/test_time_travel.py

@@ -37,6 +37,7 @@ def _checkpoint_summary(history: list) -> list[dict]:
     Returns a list of dicts (newest-first, matching get_state_history order) with:
       - id: short checkpoint id suffix (last 6 chars)
       - parent_id: short parent checkpoint id suffix or None
+      - source: checkpoint metadata source (input, loop, fork, update)
       - next: tuple of next node names
       - values: channel values snapshot
     """
@@ -52,6 +53,7 @@ def _checkpoint_summary(history: list) -> list[dict]:
             {
                 "id": cid[-6:],
                 "parent_id": pid[-6:] if pid else None,
+                "source": s.metadata.get("source"),
                 "next": s.next,
                 "values": s.values,
             }
@@ -280,6 +282,116 @@ def test_replay_from_before_interrupt_refires(
     assert call_count["node_b"] == 1  # NOT re-executed (after interrupt)
 
 
+def test_replay_from_before_interrupt_then_resume(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Replay from checkpoint before interrupt node, then resume with a new
+    answer and verify the graph completes with the new value.
+
+    Graph: START --> node_a --> ask_human (interrupt) --> node_b --> END
+
+    Original run:
+      source=input  next=(__start__,)  values=[]
+      source=loop   next=(node_a,)     values=[]
+      source=loop   next=(ask_human,)  values=[a]            <-- replay from here
+      source=loop   next=(node_b,)     values=[a, human:old_answer]
+      source=loop   next=()            values=[a, human:old_answer, b]
+
+    After replay (fork created) + resume with "new_answer":
+      source=input  next=(__start__,)  values=[]
+      source=loop   next=(node_a,)     values=[]
+      source=loop   next=(ask_human,)  values=[a]            <-- branch point
+      source=loop   next=(node_b,)     values=[a, human:old_answer]
+      source=loop   next=()            values=[a, human:old_answer, b]  (old branch)
+      source=fork   next=(ask_human,)  values=[a]            <-- fork from branch point
+      source=loop   next=(node_b,)     values=[a, human:new_answer]
+      source=loop   next=()            values=[a, human:new_answer, b]  (new branch)
+    """
+
+    called: list[str] = []
+
+    def node_a(state: State) -> State:
+        called.append("node_a")
+        return {"value": ["a"]}
+
+    def ask_human(state: State) -> State:
+        called.append("ask_human")
+        answer = interrupt("What is your input?")
+        return {"value": [f"human:{answer}"]}
+
+    def node_b(state: State) -> State:
+        called.append("node_b")
+        return {"value": ["b"]}
+
+    graph = (
+        StateGraph(State)
+        .add_node("node_a", node_a)
+        .add_node("ask_human", ask_human)
+        .add_node("node_b", node_b)
+        .add_edge(START, "node_a")
+        .add_edge("node_a", "ask_human")
+        .add_edge("ask_human", "node_b")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: invoke until interrupt, then resume to complete ---
+    graph.invoke({"value": []}, config)
+    graph.invoke(Command(resume="old_answer"), config)
+
+    original_history = list(graph.get_state_history(config))
+    original = _checkpoint_summary(original_history)
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
+        ("loop", ("ask_human",), {"value": ["a"]}),
+        ("loop", ("node_a",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Replay from checkpoint before ask_human ---
+    before_ask = next(s for s in original_history if s.next == ("ask_human",))
+
+    called.clear()
+    replay_result = graph.invoke(None, before_ask.config)
+    assert replay_result["__interrupt__"][0].value == "What is your input?"
+    assert "ask_human" in called
+    assert "node_a" not in called  # before the replay point, not re-executed
+
+    # A fork checkpoint is now the latest — it branches from the replay point
+    post_replay = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"]) for s in post_replay] == [
+        ("fork", ("ask_human",)),  # <-- new fork (latest)
+        ("loop", ()),  # original done
+        ("loop", ("node_b",)),
+        ("loop", ("ask_human",)),  # branch point
+        ("loop", ("node_a",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume with a new answer ---
+    called.clear()
+    final_result = graph.invoke(Command(resume="new_answer"), config)
+    assert final_result["value"] == ["a", "human:new_answer", "b"]
+    assert "ask_human" in called
+    assert "node_b" in called
+
+    final = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from fork)
+        ("loop", (), {"value": ["a", "human:new_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:new_answer"]}),
+        ("fork", ("ask_human",), {"value": ["a"]}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
+        ("loop", ("ask_human",), {"value": ["a"]}),
+        ("loop", ("node_a",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
 def test_replay_interrupt_stable_across_replays(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -320,8 +432,14 @@ def test_replay_interrupt_stable_across_replays(
         r = graph.invoke(None, before_ask.config)
         results.append(r)
 
-    assert all(r == results[0] for r in results)
-    assert "__interrupt__" in results[0]
+    # Each replay creates a fork with a unique interrupt ID, so we compare
+    # interrupt values and state values rather than full equality.
+    assert all("__interrupt__" in r for r in results)
+    assert all(
+        r["__interrupt__"][0].value == results[0]["__interrupt__"][0].value
+        for r in results
+    )
+    assert all(r["value"] == results[0]["value"] for r in results)
 
 
 def test_fork_from_before_interrupt_refires(
@@ -854,6 +972,354 @@ def test_subgraph_interrupt_replay_from_interrupt_checkpoint(
     assert "step_b" not in called
 
 
+def test_subgraph_interrupt_replay_from_parent_then_resume(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Replay from the parent checkpoint where a subgraph interrupt fired,
+    then resume with a new answer. Verifies that a fork is created and the
+    full graph completes. Checks full checkpoint history at each stage."""
+
+    called: list[str] = []
+
+    def router(state: State) -> State:
+        called.append("router")
+        return {"value": ["routed"]}
+
+    def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["sub_a"]}
+
+    def ask_human(state: State) -> State:
+        called.append("ask_human")
+        answer = interrupt("Provide input:")
+        return {"value": [f"human:{answer}"]}
+
+    def step_b(state: State) -> State:
+        called.append("step_b")
+        return {"value": ["sub_b"]}
+
+    subgraph = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_human", ask_human)
+        .add_node("step_b", step_b)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_human")
+        .add_edge("ask_human", "step_b")
+        .compile(checkpointer=True)
+    )
+
+    def post_process(state: State) -> State:
+        called.append("post_process")
+        return {"value": ["post"]}
+
+    graph = (
+        StateGraph(State)
+        .add_node("router", router)
+        .add_node("subgraph_node", subgraph)
+        .add_node("post_process", post_process)
+        .add_edge(START, "router")
+        .add_edge("router", "subgraph_node")
+        .add_edge("subgraph_node", "post_process")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # Run until interrupt, then resume to complete
+    graph.invoke({"value": []}, config)
+    graph.invoke(Command(resume="old_answer"), config)
+
+    # Original parent history (newest first)
+    original_history = list(graph.get_state_history(config))
+    assert [s.next for s in original_history] == [
+        (),  # done
+        ("post_process",),
+        ("subgraph_node",),  # subgraph ran, interrupt fired here
+        ("router",),
+        ("__start__",),
+    ]
+
+    # Find the parent checkpoint where the interrupt fired
+    interrupt_checkpoint = next(
+        s for s in original_history if s.next == ("subgraph_node",)
+    )
+
+    # Replay from parent checkpoint — subgraph re-executes, interrupt re-fires
+    called.clear()
+    replay_result = graph.invoke(None, interrupt_checkpoint.config)
+    assert "__interrupt__" in replay_result
+    assert replay_result["__interrupt__"][0].value == "Provide input:"
+    assert "step_a" in called
+    assert "ask_human" in called
+    assert "step_b" not in called
+
+    # Verify fork checkpoint was created
+    post_replay_history = list(graph.get_state_history(config))
+    assert [s.next for s in post_replay_history] == [
+        ("subgraph_node",),  # fork (interrupt pending)
+        (),  # original done
+        ("post_process",),
+        ("subgraph_node",),
+        ("router",),
+        ("__start__",),
+    ]
+    assert [s.metadata["source"] for s in post_replay_history] == [
+        "fork",
+        "loop",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+    ]
+    fork = post_replay_history[0]
+    assert (
+        fork.parent_config["configurable"]["checkpoint_id"]
+        == interrupt_checkpoint.config["configurable"]["checkpoint_id"]
+    )
+
+    # Resume with a new answer — full graph should complete
+    called.clear()
+    final_result = graph.invoke(Command(resume="new_answer"), config)
+    assert "__interrupt__" not in final_result
+    assert "human:new_answer" in final_result["value"]
+    assert "sub_b" in final_result["value"]
+    assert "post" in final_result["value"]
+    assert "ask_human" in called
+    assert "step_b" in called
+    assert "post_process" in called
+
+    # Final checkpoint history
+    final_history = list(graph.get_state_history(config))
+    assert [s.next for s in final_history] == [
+        (),  # new branch done
+        ("post_process",),  # new branch post_process
+        ("subgraph_node",),  # fork
+        (),  # original done
+        ("post_process",),
+        ("subgraph_node",),
+        ("router",),
+        ("__start__",),
+    ]
+    assert [s.metadata["source"] for s in final_history] == [
+        "loop",
+        "loop",
+        "fork",
+        "loop",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+    ]
+
+
+def test_subgraph_interrupt_resume_with_explicit_head_checkpoint_id(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Resume with Command(resume=...) plus the current head checkpoint_id
+    in config. The subgraph must continue from the interrupted node, not
+    restart from scratch. Explicit checkpoint_id triggers is_replaying but
+    this is a resume, not a time-travel, so ReplayState should not apply."""
+
+    called: list[str] = []
+
+    def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["sub_a"]}
+
+    def ask_human(state: State) -> State:
+        called.append("ask_human")
+        answer = interrupt("Provide input:")
+        return {"value": [f"human:{answer}"]}
+
+    def step_b(state: State) -> State:
+        called.append("step_b")
+        return {"value": ["sub_b"]}
+
+    subgraph = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_human", ask_human)
+        .add_node("step_b", step_b)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_human")
+        .add_edge("ask_human", "step_b")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("subgraph_node", subgraph)
+        .add_edge(START, "subgraph_node")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # Run until interrupt fires in subgraph
+    graph.invoke({"value": []}, config)
+    assert called == ["step_a", "ask_human"]
+
+    # Resume with explicit head checkpoint_id in config
+    head_checkpoint_id = graph.get_state(config).config["configurable"]["checkpoint_id"]
+    called.clear()
+    resume_config = {
+        "configurable": {
+            "thread_id": "1",
+            "checkpoint_id": head_checkpoint_id,
+            "checkpoint_ns": "",
+        }
+    }
+    result = graph.invoke(Command(resume="answer"), resume_config)
+
+    assert called == ["ask_human", "step_b"]
+    assert "__interrupt__" not in result
+    assert result["value"] == ["sub_a", "human:answer", "sub_b"]
+
+
+def test_subgraph_replay_loads_accumulated_state_then_resume(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Two parent invocations, then replay from before the subgraph in the
+    2nd invocation. The subgraph (checkpointer=True) should load its
+    accumulated state from the 1st invocation via ReplayState, re-fire
+    the interrupt, and then resume + complete.
+
+    This tests the ReplayState path: the parent is replaying and the
+    subgraph uses list(before=parent_checkpoint_id) to find its
+    corresponding checkpoint from the original execution.
+    """
+
+    class SubState(TypedDict):
+        value: Annotated[list[str], operator.add]
+
+    class ParentState(TypedDict):
+        results: Annotated[list[str], operator.add]
+
+    started_state: list[dict] = []
+
+    def step_a(state: SubState) -> SubState:
+        started_state.append(dict(state))
+        answer = interrupt("question_a")
+        return {"value": [f"a:{answer}"]}
+
+    subgraph = (
+        StateGraph(SubState)
+        .add_node("step_a", step_a)
+        .add_edge(START, "step_a")
+        .compile(checkpointer=True)
+    )
+
+    def parent_node(state: ParentState) -> ParentState:
+        return {"results": ["p"]}
+
+    graph = (
+        StateGraph(ParentState)
+        .add_node("parent_node", parent_node)
+        .add_node("sub_node", subgraph)
+        .add_edge(START, "parent_node")
+        .add_edge("parent_node", "sub_node")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # === 1st invocation: complete with answer "a1" ===
+    graph.invoke({"results": []}, config)
+    graph.invoke(Command(resume="a1"), config)
+
+    # step_a saw empty state (fresh subgraph)
+    assert started_state[0] == {"value": []}
+
+    # === 2nd invocation: complete with answer "a2" ===
+    started_state.clear()
+    graph.invoke({"results": []}, config)
+    graph.invoke(Command(resume="a2"), config)
+
+    # Stateful subgraph retained state from 1st invocation
+    assert started_state[0] == {"value": ["a:a1"]}
+
+    # Original history (newest first)
+    original_history = list(graph.get_state_history(config))
+    assert [s.next for s in original_history] == [
+        (),  # 2nd done
+        ("sub_node",),  # 2nd sub_node
+        ("parent_node",),  # 2nd parent_node
+        ("__start__",),  # 2nd input
+        (),  # 1st done
+        ("sub_node",),  # 1st sub_node
+        ("parent_node",),  # 1st parent_node
+        ("__start__",),  # 1st input
+    ]
+
+    # Replay from before sub_node in 2nd invocation (newest match)
+    before_sub_2nd = [s for s in original_history if s.next == ("sub_node",)][0]
+    started_state.clear()
+    replay = graph.invoke(None, before_sub_2nd.config)
+    assert "__interrupt__" in replay
+
+    # Subgraph should see accumulated state from END of 1st invocation
+    assert started_state[0] == {"value": ["a:a1"]}
+
+    # Verify fork was created
+    post_replay_history = list(graph.get_state_history(config))
+    assert [s.next for s in post_replay_history] == [
+        ("sub_node",),  # fork (interrupt pending)
+        (),  # 2nd done
+        ("sub_node",),  # 2nd sub_node
+        ("parent_node",),  # 2nd parent_node
+        ("__start__",),  # 2nd input
+        (),  # 1st done
+        ("sub_node",),  # 1st sub_node
+        ("parent_node",),  # 1st parent_node
+        ("__start__",),  # 1st input
+    ]
+    assert [s.metadata["source"] for s in post_replay_history] == [
+        "fork",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+    ]
+
+    # Resume with a new answer
+    started_state.clear()
+    final = graph.invoke(Command(resume="a3"), config)
+    assert "__interrupt__" not in final
+    assert final["results"] == ["p", "p"]
+
+    # Final history
+    final_history = list(graph.get_state_history(config))
+    assert [s.next for s in final_history] == [
+        (),  # new branch done
+        ("sub_node",),  # fork
+        (),  # 2nd done
+        ("sub_node",),  # 2nd sub_node
+        ("parent_node",),  # 2nd parent_node
+        ("__start__",),  # 2nd input
+        (),  # 1st done
+        ("sub_node",),  # 1st sub_node
+        ("parent_node",),  # 1st parent_node
+        ("__start__",),  # 1st input
+    ]
+    assert [s.metadata["source"] for s in final_history] == [
+        "loop",
+        "fork",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+        "loop",
+        "loop",
+        "loop",
+        "input",
+    ]
+
+
 def test_subgraph_interrupt_full_flow(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -1290,6 +1756,321 @@ def test_subgraph_time_travel_to_second_interrupt(
     assert "ask_1" not in called
 
 
+def test_subgraph_time_travel_resume_from_first_interrupt(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Time travel to a subgraph checkpoint at the first interrupt, then
+    resume through both interrupts with new answers.
+
+    This verifies the key bug fix: after time-traveling to a subgraph
+    checkpoint with an interrupt, a fork checkpoint is created so that
+    subsequent resumes find the correct state (not the old branch tip).
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
+
+    Parent history after original run completes:
+      source=input  next=(__start__,)   values=[]
+      source=loop   next=(executor,)    values=[]
+      source=loop   next=()             values=[step_a_done, ask_1:answer_1, ask_2:answer_2]
+
+    After time-traveling to 1st interrupt + resuming with new answers:
+      source=input  next=(__start__,)   values=[]
+      source=loop   next=(executor,)    values=[]          <-- branch point
+      source=loop   next=()             values=[..., ask_2:answer_2]  (old branch)
+      source=fork   next=(executor,)    values=[]          <-- fork from time travel
+      source=loop   next=()             values=[..., ask_2:new_answer_2]  (new branch)
+    """
+
+    called: list[str] = []
+
+    def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["step_a_done"]}
+
+    def ask_1(state: State) -> State:
+        called.append("ask_1")
+        answer = interrupt("Question 1?")
+        return {"value": [f"ask_1:{answer}"]}
+
+    def ask_2(state: State) -> State:
+        called.append("ask_2")
+        answer = interrupt("Question 2?")
+        return {"value": [f"ask_2:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_1", ask_1)
+        .add_node("ask_2", ask_2)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_1")
+        .add_edge("ask_1", "ask_2")
+        .add_edge("ask_2", "__end__")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: hit both interrupts and resume ---
+    graph.invoke({"value": []}, config)
+    sub_config_at_first = graph.get_state(config, subgraphs=True).tasks[0].state.config
+    graph.invoke(Command(resume="answer_1"), config)
+    graph.invoke(Command(resume="answer_2"), config)
+
+    original = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Time travel to first interrupt's subgraph checkpoint ---
+    called.clear()
+    replay_result = graph.invoke(None, sub_config_at_first)
+    assert replay_result["__interrupt__"][0].value == "Question 1?"
+    assert "step_a" not in called  # before interrupt, not re-executed
+
+    # Fork is now the latest parent checkpoint
+    post_tt = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"]) for s in post_tt] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),  # original done
+        ("loop", ("executor",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume both interrupts with new answers ---
+    called.clear()
+    resume_1 = graph.invoke(Command(resume="new_answer_1"), config)
+    assert resume_1["__interrupt__"][0].value == "Question 2?"
+    assert "ask_1" in called
+
+    called.clear()
+    resume_2 = graph.invoke(Command(resume="new_answer_2"), config)
+    assert resume_2["value"] == [
+        "step_a_done",
+        "ask_1:new_answer_1",
+        "ask_2:new_answer_2",
+    ]
+
+    # Verify final history: original branch preserved, new branch appended
+    final = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from time travel fork)
+        (
+            "loop",
+            (),
+            {"value": ["step_a_done", "ask_1:new_answer_1", "ask_2:new_answer_2"]},
+        ),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
+def test_subgraph_time_travel_resume_from_second_interrupt(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Time travel to a subgraph checkpoint at the second interrupt, then
+    resume with a new answer. The first interrupt's answer should be preserved.
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
+
+    Key assertion: after resuming from a time-travel to the 2nd interrupt,
+    the final state keeps ask_1's original answer but uses the new ask_2 answer.
+    """
+
+    called: list[str] = []
+
+    def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["step_a_done"]}
+
+    def ask_1(state: State) -> State:
+        called.append("ask_1")
+        answer = interrupt("Question 1?")
+        return {"value": [f"ask_1:{answer}"]}
+
+    def ask_2(state: State) -> State:
+        called.append("ask_2")
+        answer = interrupt("Question 2?")
+        return {"value": [f"ask_2:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_1", ask_1)
+        .add_node("ask_2", ask_2)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_1")
+        .add_edge("ask_1", "ask_2")
+        .add_edge("ask_2", "__end__")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: hit both interrupts and resume ---
+    graph.invoke({"value": []}, config)
+    graph.invoke(Command(resume="answer_1"), config)
+    sub_config_at_second = graph.get_state(config, subgraphs=True).tasks[0].state.config
+    graph.invoke(Command(resume="answer_2"), config)
+
+    original = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Time travel to second interrupt ---
+    called.clear()
+    replay_result = graph.invoke(None, sub_config_at_second)
+    assert replay_result["__interrupt__"][0].value == "Question 2?"
+    assert "step_a" not in called
+    assert "ask_1" not in called  # already resolved, not re-executed
+
+    # Fork is now the latest parent checkpoint
+    post_tt = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"]) for s in post_tt] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),  # original done
+        ("loop", ("executor",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume with a new answer for ask_2 only ---
+    called.clear()
+    resume_result = graph.invoke(Command(resume="new_answer_2"), config)
+    # ask_1's original answer preserved, ask_2 uses the new answer
+    assert resume_result["value"] == [
+        "step_a_done",
+        "ask_1:answer_1",
+        "ask_2:new_answer_2",
+    ]
+
+    # Verify final history: original branch preserved, new branch appended
+    final = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from time travel fork)
+        (
+            "loop",
+            (),
+            {"value": ["step_a_done", "ask_1:answer_1", "ask_2:new_answer_2"]},
+        ),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
+def test_subgraph_time_travel_checkpoint_pattern(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Verify the checkpoint pattern created by time travel to a subgraph
+    interrupt. A fork checkpoint should branch from the replay point and
+    become the latest parent checkpoint.
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> ask (interrupt) --> END
+
+    Original run (after completing):
+      source=input  next=(__start__,)  values=[]
+      source=loop   next=(executor,)   values=[]          <-- replay point
+      source=loop   next=()            values=[a:first]
+
+    After time travel to interrupt + resume with "second":
+      source=input  next=(__start__,)  values=[]
+      source=loop   next=(executor,)   values=[]          <-- branch point
+      source=loop   next=()            values=[a:first]   (old branch)
+      source=fork   next=(executor,)   values=[]          <-- fork
+      source=loop   next=()            values=[a:second]  (new branch)
+    """
+
+    def ask(state: State) -> State:
+        answer = interrupt("Q?")
+        return {"value": [f"a:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("ask", ask)
+        .add_edge(START, "ask")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=sync_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # Run until interrupt, then complete
+    graph.invoke({"value": []}, config)
+    sub_config = graph.get_state(config, subgraphs=True).tasks[0].state.config
+    graph.invoke(Command(resume="first"), config)
+
+    original = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["a:first"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # Time travel to the interrupt
+    graph.invoke(None, sub_config)
+
+    # Fork is now the latest, branching from the original replay point
+    post_tt = list(graph.get_state_history(config))
+    post_tt_summary = _checkpoint_summary(post_tt)
+    assert [(s["source"], s["next"]) for s in post_tt_summary] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),
+        ("loop", ("executor",)),  # <-- replay point / fork parent
+        ("input", ("__start__",)),
+    ]
+    # Verify the fork's parent is the original replay point
+    replay_point_id = sub_config["configurable"]["checkpoint_map"][""]
+    assert post_tt[0].parent_config["configurable"]["checkpoint_id"] == replay_point_id
+
+    # Resume from the fork — graph completes with new answer
+    result = graph.invoke(Command(resume="second"), config)
+    assert result["value"] == ["a:second"]
+
+    final = _checkpoint_summary(list(graph.get_state_history(config)))
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch
+        ("loop", (), {"value": ["a:second"]}),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch
+        ("loop", (), {"value": ["a:first"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
 def test_subgraph_time_travel_after_completion(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -2283,14 +3064,16 @@ def test_replay_creates_branch_preserving_old_checkpoints(
     # -- Post-replay checkpoint history (newest first) --
     post_replay_history = list(graph.get_state_history(config))
     post_summary = _checkpoint_summary(post_replay_history)
-    assert len(post_summary) == 7  # 5 original + 2 new branch checkpoints
+    # 5 original + 1 fork + 2 new branch checkpoints = 8
+    assert len(post_summary) == 8
 
     # Verify the full shape after replay
     assert [s["next"] for s in post_summary] == [
-        (),  # new branch tip (C6)
-        ("node_c",),  # new branch (C5)
-        (),  # old branch tip (C4)
-        ("node_c",),  # old (C3)
+        (),  # new branch tip
+        ("node_c",),  # new branch
+        ("node_b",),  # fork from replay point
+        (),  # old branch tip
+        ("node_c",),  # old
         ("node_b",),  # branch point (C2)
         ("node_a",),  # old (C1)
         ("__start__",),  # old (C0)
@@ -2298,6 +3081,7 @@ def test_replay_creates_branch_preserving_old_checkpoints(
     assert [s["values"] for s in post_summary] == [
         {"value": ["a", "b2", "c"]},  # new branch tip
         {"value": ["a", "b2"]},  # new: node_b re-ran with call_count=2
+        {"value": ["a"]},  # fork from replay point
         {"value": ["a", "b1", "c"]},  # old branch tip preserved
         {"value": ["a", "b1"]},  # old
         {"value": ["a"]},  # branch point

libs/langgraph/tests/test_time_travel_async.py

@@ -46,6 +46,7 @@ def _checkpoint_summary(history: list) -> list[dict]:
     Returns a list of dicts (newest-first, matching get_state_history order) with:
       - id: short checkpoint id suffix (last 6 chars)
       - parent_id: short parent checkpoint id suffix or None
+      - source: checkpoint metadata source (input, loop, fork, update)
       - next: tuple of next node names
       - values: channel values snapshot
     """
@@ -61,6 +62,7 @@ def _checkpoint_summary(history: list) -> list[dict]:
             {
                 "id": cid[-6:],
                 "parent_id": pid[-6:] if pid else None,
+                "source": s.metadata.get("source"),
                 "next": s.next,
                 "values": s.values,
             }
@@ -335,8 +337,14 @@ async def test_replay_interrupt_stable_across_replays(
         r = await graph.ainvoke(None, before_ask.config)
         results.append(r)
 
-    assert all(r == results[0] for r in results)
-    assert "__interrupt__" in results[0]
+    # Each replay creates a fork with a unique interrupt ID, so we compare
+    # interrupt values and state values rather than full equality.
+    assert all("__interrupt__" in r for r in results)
+    assert all(
+        r["__interrupt__"][0].value == results[0]["__interrupt__"][0].value
+        for r in results
+    )
+    assert all(r["value"] == results[0]["value"] for r in results)
 
 
 @NEEDS_CONTEXTVARS
@@ -1261,6 +1269,391 @@ async def test_subgraph_time_travel_after_completion_async(
     assert "ask_2:answer_2" in replay_result["value"]
 
 
+@NEEDS_CONTEXTVARS
+async def test_replay_from_before_interrupt_then_resume_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Replay from checkpoint before interrupt node, then resume with a new
+    answer and verify the graph completes with the new value.
+
+    Graph: START --> node_a --> ask_human (interrupt) --> node_b --> END
+    """
+
+    called: list[str] = []
+
+    async def node_a(state: State) -> State:
+        called.append("node_a")
+        return {"value": ["a"]}
+
+    async def ask_human(state: State) -> State:
+        called.append("ask_human")
+        answer = interrupt("What is your input?")
+        return {"value": [f"human:{answer}"]}
+
+    async def node_b(state: State) -> State:
+        called.append("node_b")
+        return {"value": ["b"]}
+
+    graph = (
+        StateGraph(State)
+        .add_node("node_a", node_a)
+        .add_node("ask_human", ask_human)
+        .add_node("node_b", node_b)
+        .add_edge(START, "node_a")
+        .add_edge("node_a", "ask_human")
+        .add_edge("ask_human", "node_b")
+        .compile(checkpointer=async_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: invoke until interrupt, then resume to complete ---
+    await graph.ainvoke({"value": []}, config)
+    await graph.ainvoke(Command(resume="old_answer"), config)
+
+    original_history = [s async for s in graph.aget_state_history(config)]
+    original = _checkpoint_summary(original_history)
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
+        ("loop", ("ask_human",), {"value": ["a"]}),
+        ("loop", ("node_a",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Replay from checkpoint before ask_human ---
+    before_ask = next(s for s in original_history if s.next == ("ask_human",))
+
+    called.clear()
+    replay_result = await graph.ainvoke(None, before_ask.config)
+    assert replay_result["__interrupt__"][0].value == "What is your input?"
+    assert "ask_human" in called
+    assert "node_a" not in called
+
+    # A fork checkpoint is now the latest
+    post_replay = _checkpoint_summary(
+        [s async for s in graph.aget_state_history(config)]
+    )
+    assert [(s["source"], s["next"]) for s in post_replay] == [
+        ("fork", ("ask_human",)),
+        ("loop", ()),
+        ("loop", ("node_b",)),
+        ("loop", ("ask_human",)),
+        ("loop", ("node_a",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume with a new answer ---
+    called.clear()
+    final_result = await graph.ainvoke(Command(resume="new_answer"), config)
+    assert final_result["value"] == ["a", "human:new_answer", "b"]
+    assert "ask_human" in called
+    assert "node_b" in called
+
+    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from fork)
+        ("loop", (), {"value": ["a", "human:new_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:new_answer"]}),
+        ("fork", ("ask_human",), {"value": ["a"]}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
+        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
+        ("loop", ("ask_human",), {"value": ["a"]}),
+        ("loop", ("node_a",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
+@NEEDS_CONTEXTVARS
+async def test_subgraph_time_travel_resume_from_first_interrupt_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Time travel to a subgraph checkpoint at the first interrupt, then
+    resume through both interrupts with new answers.
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
+    """
+
+    called: list[str] = []
+
+    async def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["step_a_done"]}
+
+    async def ask_1(state: State) -> State:
+        called.append("ask_1")
+        answer = interrupt("Question 1?")
+        return {"value": [f"ask_1:{answer}"]}
+
+    async def ask_2(state: State) -> State:
+        called.append("ask_2")
+        answer = interrupt("Question 2?")
+        return {"value": [f"ask_2:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_1", ask_1)
+        .add_node("ask_2", ask_2)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_1")
+        .add_edge("ask_1", "ask_2")
+        .add_edge("ask_2", "__end__")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=async_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: hit both interrupts and resume ---
+    await graph.ainvoke({"value": []}, config)
+    sub_config_at_first = (
+        (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
+    )
+    await graph.ainvoke(Command(resume="answer_1"), config)
+    await graph.ainvoke(Command(resume="answer_2"), config)
+
+    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Time travel to first interrupt's subgraph checkpoint ---
+    called.clear()
+    replay_result = await graph.ainvoke(None, sub_config_at_first)
+    assert replay_result["__interrupt__"][0].value == "Question 1?"
+    assert "step_a" not in called
+
+    # Fork is now the latest parent checkpoint
+    post_tt = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"]) for s in post_tt] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),  # original done
+        ("loop", ("executor",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume both interrupts with new answers ---
+    called.clear()
+    resume_1 = await graph.ainvoke(Command(resume="new_answer_1"), config)
+    assert resume_1["__interrupt__"][0].value == "Question 2?"
+    assert "ask_1" in called
+
+    called.clear()
+    resume_2 = await graph.ainvoke(Command(resume="new_answer_2"), config)
+    assert resume_2["value"] == [
+        "step_a_done",
+        "ask_1:new_answer_1",
+        "ask_2:new_answer_2",
+    ]
+
+    # Verify final history: original branch preserved, new branch appended
+    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from time travel fork)
+        (
+            "loop",
+            (),
+            {"value": ["step_a_done", "ask_1:new_answer_1", "ask_2:new_answer_2"]},
+        ),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
+@NEEDS_CONTEXTVARS
+async def test_subgraph_time_travel_resume_from_second_interrupt_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Time travel to a subgraph checkpoint at the second interrupt, then
+    resume with a new answer. The first interrupt's answer should be preserved.
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
+    """
+
+    called: list[str] = []
+
+    async def step_a(state: State) -> State:
+        called.append("step_a")
+        return {"value": ["step_a_done"]}
+
+    async def ask_1(state: State) -> State:
+        called.append("ask_1")
+        answer = interrupt("Question 1?")
+        return {"value": [f"ask_1:{answer}"]}
+
+    async def ask_2(state: State) -> State:
+        called.append("ask_2")
+        answer = interrupt("Question 2?")
+        return {"value": [f"ask_2:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("step_a", step_a)
+        .add_node("ask_1", ask_1)
+        .add_node("ask_2", ask_2)
+        .add_edge(START, "step_a")
+        .add_edge("step_a", "ask_1")
+        .add_edge("ask_1", "ask_2")
+        .add_edge("ask_2", "__end__")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=async_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # --- Original run: hit both interrupts and resume ---
+    await graph.ainvoke({"value": []}, config)
+    await graph.ainvoke(Command(resume="answer_1"), config)
+    sub_config_at_second = (
+        (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
+    )
+    await graph.ainvoke(Command(resume="answer_2"), config)
+
+    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # --- Time travel to second interrupt ---
+    called.clear()
+    replay_result = await graph.ainvoke(None, sub_config_at_second)
+    assert replay_result["__interrupt__"][0].value == "Question 2?"
+    assert "step_a" not in called
+    assert "ask_1" not in called
+
+    # Fork is now the latest parent checkpoint
+    post_tt = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"]) for s in post_tt] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),  # original done
+        ("loop", ("executor",)),
+        ("input", ("__start__",)),
+    ]
+
+    # --- Resume with a new answer for ask_2 only ---
+    called.clear()
+    resume_result = await graph.ainvoke(Command(resume="new_answer_2"), config)
+    assert resume_result["value"] == [
+        "step_a_done",
+        "ask_1:answer_1",
+        "ask_2:new_answer_2",
+    ]
+
+    # Verify final history
+    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch (from time travel fork)
+        (
+            "loop",
+            (),
+            {"value": ["step_a_done", "ask_1:answer_1", "ask_2:new_answer_2"]},
+        ),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch (preserved)
+        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
+@NEEDS_CONTEXTVARS
+async def test_subgraph_time_travel_checkpoint_pattern_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    """Verify the checkpoint pattern created by time travel to a subgraph
+    interrupt. A fork checkpoint should branch from the replay point.
+
+    Parent:    START --> executor (subgraph, checkpointer=True) --> END
+    Executor:  START --> ask (interrupt) --> END
+    """
+
+    async def ask(state: State) -> State:
+        answer = interrupt("Q?")
+        return {"value": [f"a:{answer}"]}
+
+    executor = (
+        StateGraph(State)
+        .add_node("ask", ask)
+        .add_edge(START, "ask")
+        .compile(checkpointer=True)
+    )
+
+    graph = (
+        StateGraph(State)
+        .add_node("executor", executor)
+        .add_edge(START, "executor")
+        .compile(checkpointer=async_checkpointer)
+    )
+
+    config = {"configurable": {"thread_id": "1"}}
+
+    # Run until interrupt, then complete
+    await graph.ainvoke({"value": []}, config)
+    sub_config = (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
+    await graph.ainvoke(Command(resume="first"), config)
+
+    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in original] == [
+        ("loop", (), {"value": ["a:first"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+    # Time travel to the interrupt
+    await graph.ainvoke(None, sub_config)
+
+    # Fork is now the latest, branching from the original replay point
+    post_tt = [s async for s in graph.aget_state_history(config)]
+    post_tt_summary = _checkpoint_summary(post_tt)
+    assert [(s["source"], s["next"]) for s in post_tt_summary] == [
+        ("fork", ("executor",)),  # <-- new fork (latest)
+        ("loop", ()),
+        ("loop", ("executor",)),  # <-- replay point / fork parent
+        ("input", ("__start__",)),
+    ]
+    # Verify the fork's parent is the original replay point
+    replay_point_id = sub_config["configurable"]["checkpoint_map"][""]
+    assert post_tt[0].parent_config["configurable"]["checkpoint_id"] == replay_point_id
+
+    # Resume from the fork
+    result = await graph.ainvoke(Command(resume="second"), config)
+    assert result["value"] == ["a:second"]
+
+    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
+    assert [(s["source"], s["next"], s["values"]) for s in final] == [
+        # New branch
+        ("loop", (), {"value": ["a:second"]}),
+        ("fork", ("executor",), {"value": []}),
+        # Original branch
+        ("loop", (), {"value": ["a:first"]}),
+        ("loop", ("executor",), {"value": []}),
+        ("input", ("__start__",), {"value": []}),
+    ]
+
+
 @NEEDS_CONTEXTVARS
 async def test_3_levels_deep_time_travel_to_first_interrupt_async(
     async_checkpointer: BaseCheckpointSaver,
@@ -2088,13 +2481,15 @@ async def test_replay_creates_branch_preserving_old_checkpoints(
     # -- Post-replay checkpoint history (newest first) --
     post_replay_history = [s async for s in graph.aget_state_history(config)]
     post_summary = _checkpoint_summary(post_replay_history)
-    assert len(post_summary) == 7  # 5 original + 2 new branch checkpoints
+    # 5 original + 1 fork + 2 new branch checkpoints = 8
+    assert len(post_summary) == 8
 
     assert [s["next"] for s in post_summary] == [
-        (),  # new branch tip (C6)
-        ("node_c",),  # new branch (C5)
-        (),  # old branch tip (C4)
-        ("node_c",),  # old (C3)
+        (),  # new branch tip
+        ("node_c",),  # new branch
+        ("node_b",),  # fork from replay point
+        (),  # old branch tip
+        ("node_c",),  # old
         ("node_b",),  # branch point (C2)
         ("node_a",),  # old (C1)
         ("__start__",),  # old (C0)
@@ -2102,6 +2497,7 @@ async def test_replay_creates_branch_preserving_old_checkpoints(
     assert [s["values"] for s in post_summary] == [
         {"value": ["a", "b2", "c"]},  # new branch tip
         {"value": ["a", "b2"]},  # new: node_b re-ran with call_count=2
+        {"value": ["a"]},  # fork from replay point
         {"value": ["a", "b1", "c"]},  # old branch tip preserved
         {"value": ["a", "b1"]},  # old
         {"value": ["a"]},  # branch point

libs/langgraph/tests/test_utils.py

@@ -11,13 +11,19 @@ from typing import (
     TypeVar,
     Union,
 )
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
 import langsmith
 import pytest
+from langchain_core.runnables import RunnableConfig
+from langchain_core.tracers import LangChainTracer
 from typing_extensions import NotRequired, Required, TypedDict
 
-from langgraph._internal._config import _is_not_empty, ensure_config
+from langgraph._internal._config import (
+    _is_not_empty,
+    ensure_config,
+    get_callback_manager_for_config,
+)
 from langgraph._internal._fields import (
     _is_optional_type,
     get_enhanced_type_hints,
@@ -298,7 +304,7 @@ def test_is_not_empty() -> None:
     assert not _is_not_empty({})
 
 
-def test_configurable_metadata():
+def test_configurable_metadata() -> None:
     config = {
         "configurable": {
             "a-key": "foo",
@@ -309,11 +315,115 @@ def test_configurable_metadata():
             "andme": 42,
             "nested": {"foo": "bar"},
             "nooverride": -2,
+            "thread_id": "th-123",
+            "checkpoint_id": "ckpt-1",
+            "checkpoint_ns": "ns-1",
+            "task_id": "task-1",
+            "run_id": "run-456",
+            "assistant_id": "asst-789",
+            "graph_id": "graph-0",
+            "model": "gpt-4o",
+            "user_id": "uid-1",
+            "cron_id": "cron-1",
+            "langgraph_auth_user_id": "user-1",
         },
         "metadata": {"nooverride": 18},
     }
-    expected = {"includeme", "andme", "nooverride"}
     merged = ensure_config(config)
     metadata = merged["metadata"]
-    assert metadata.keys() == expected
+    assert set(metadata) == {
+        "nooverride",
+        "assistant_id",
+        "thread_id",
+        "checkpoint_id",
+        "run_id",
+        "graph_id",
+        "checkpoint_ns",
+        "task_id",
+    }
     assert metadata["nooverride"] == 18
+
+
+def test_callback_manager_copies_whitelisted_configurable_ids_to_metadata() -> None:
+    config = {
+        "configurable": {
+            "thread_id": "th-123",
+            "checkpoint_id": "ckpt-1",
+            "checkpoint_ns": "ns-1",
+            "task_id": "task-1",
+            "run_id": "run-456",
+            "assistant_id": "asst-789",
+            "graph_id": "graph-0",
+            "model": "gpt-4o",
+            "user_id": "uid-1",
+            "cron_id": "cron-1",
+            "langgraph_auth_user_id": "user-1",
+        },
+        "metadata": {
+            "thread_id": "from-metadata",
+            "nooverride": 18,
+        },
+    }
+    manager = ensure_config(config)
+    callback_manager = get_callback_manager_for_config(manager)
+    assert callback_manager.metadata == {
+        "thread_id": "from-metadata",
+        "nooverride": 18,
+        "checkpoint_id": "ckpt-1",
+        "checkpoint_ns": "ns-1",
+        "task_id": "task-1",
+        "run_id": "run-456",
+        "assistant_id": "asst-789",
+        "graph_id": "graph-0",
+    }
+
+
+def test_callback_manager_copies_configurable_ids_to_tracing_metadata() -> None:
+    tracer = LangChainTracer(client=MagicMock())
+    config: RunnableConfig = {
+        "configurable": {
+            "thread_id": "th-123",
+            "checkpoint_id": "ckpt-1",
+            "checkpoint_ns": "ns-1",
+            "task_id": "task-1",
+            "run_id": "run-456",
+            "assistant_id": "asst-789",
+            "graph_id": "graph-0",
+            "model": "gpt-4o",
+            "user_id": "uid-1",
+            "cron_id": "cron-1",
+            "langgraph_auth_user_id": "user-1",
+            "includeme": "hi",
+            "andme": 42,
+            "__dontinclude": "bar",
+            "some_api_key": "secret",
+            "custom_setting": {"nested": True},
+        },
+        "metadata": {
+            "thread_id": "from-metadata",
+            "user_id": "from-metadata-user",
+            "includeme": "from-metadata",
+        },
+        "callbacks": [tracer],
+    }
+
+    manager = ensure_config(config)
+    callback_manager = get_callback_manager_for_config(manager)
+    handlers = callback_manager.handlers
+    tracers = [handler for handler in handlers if isinstance(handler, LangChainTracer)]
+    assert len(tracers) == 1
+    tracer = tracers[0]
+    assert tracer.tracing_metadata == {
+        "checkpoint_id": "ckpt-1",
+        "checkpoint_ns": "ns-1",
+        "task_id": "task-1",
+        "run_id": "run-456",
+        "assistant_id": "asst-789",
+        "graph_id": "graph-0",
+        "model": "gpt-4o",
+        "cron_id": "cron-1",
+        "andme": 42,
+        "includeme": "hi",
+        "thread_id": "th-123",
+        "user_id": "uid-1",
+    }

libs/langgraph/uv.lock

@@ -7,6 +7,9 @@ resolution-markers = [
     "python_full_version < '3.11'",
 ]
 
+[options]
+prerelease-mode = "allow"
+
 [[package]]
 name = "aiosqlite"
 version = "0.22.1"
@@ -524,61 +527,61 @@ toml = [
 
 [[package]]
 name = "cryptography"
-version = "46.0.6"
+version = "46.0.7"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "cffi", marker = "python_full_version >= '3.11' and python_full_version < '3.14' and platform_python_implementation != 'PyPy'" },
 ]
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 [[package]]
@@ -1348,10 +1351,11 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.22"
+version = "1.3.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -1360,14 +1364,26 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/a3/c4cd6827a1df46c821e7214b7f7b7a28b189e6c9b84ef15c6d629c5e3179/langchain_core-1.2.22.tar.gz", hash = "sha256:8d8f726d03d3652d403da915126626bb6250747e8ba406537d849e68b9f5d058", size = 842487, upload-time = "2026-03-24T18:48:44.9Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a8/03/7219502e8ca728d65eb44d7a3eb60239230742a70dbfc9241b9bfd61c4ab/langchain_core-1.3.2.tar.gz", hash = "sha256:fd7a50b2f28ba561fd9d7f5d2760bc9e06cf00cdf820a3ccafe88a94ffa8d5b7", size = 911813, upload-time = "2026-04-24T15:49:23.699Z" }
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+    { url = "https://files.pythonhosted.org/packages/7d/d5/8fa4431007cbb7cfed7590f4d6a5dea3ad724f4174d248f6642ef5ce7d05/langchain_core-1.3.2-py3-none-any.whl", hash = "sha256:d44a66127f9f8db735bdfd0ab9661bccb47a97113cfd3f2d89c74864422b7274", size = 542390, upload-time = "2026-04-24T15:49:21.991Z" },
+]
+
+[[package]]
+name = "langchain-protocol"
+version = "0.0.14"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/05/bf/efb5e2ed832e4d6d45590e25a9e5191986b291b543bc6a807b48bee070b0/langchain_protocol-0.0.14.tar.gz", hash = "sha256:bc1e8553122e6ede310280462d5813023a172ff2785ccbbdec54d43f3a15e5f2", size = 5862, upload-time = "2026-04-29T16:40:18.657Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c2/e9/06c47ecb2aff08f83dfa30058da3bf86be64862c19569043ed5331bbeecd/langchain_protocol-0.0.14-py3-none-any.whl", hash = "sha256:ffc35089779bd8ca217015180cef5e660fc3b074efdaa0f2e95df73583f1a047", size = 6984, upload-time = "2026-04-29T16:40:17.841Z" },
 ]
 
 [[package]]
 name = "langgraph"
-version = "1.1.6"
+version = "1.2.0a2"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -1439,7 +1455,7 @@ test = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.1" },
+    { name = "langchain-core", specifier = ">=1.3.2,<2" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-prebuilt", editable = "../prebuilt" },
     { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -1548,7 +1564,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.1.0a2"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -1706,7 +1722,7 @@ inmem = [
 requires-dist = [
     { name = "click", specifier = ">=8.1.7" },
     { name = "httpx", specifier = ">=0.24.0" },
-    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.5.35,<0.8.0" },
+    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.5.35,<0.9.0" },
     { name = "langgraph-runtime-inmem", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.7" },
     { name = "langgraph-sdk", marker = "python_full_version >= '3.11'", specifier = ">=0.1.0" },
     { name = "pathspec", specifier = ">=0.11.0" },
@@ -1742,7 +1758,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.0.9"
+version = "1.0.10"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },
@@ -1852,7 +1868,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.6.4"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -1862,11 +1878,12 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e7/85/9c7933052a997da1b85bc5c774f3865e9b1da1c8d71541ea133178b13229/langsmith-0.6.4.tar.gz", hash = "sha256:36f7223a01c218079fbb17da5e536ebbaf5c1468c028abe070aa3ae59bc99ec8", size = 919964, upload-time = "2026-01-15T20:02:28.873Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [package.optional-dependencies]
@@ -2905,7 +2922,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "9.0.2"
+version = "9.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -2916,9 +2933,9 @@ dependencies = [
     { name = "pygments" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
 ]
 
 [[package]]

libs/prebuilt/langgraph/prebuilt/tool_node.py

@@ -614,6 +614,7 @@ class _InjectedArgs:
     store: str | None
     runtime: str | None
     all_injected_keys: set[str]
+    _optional_state_args: set[str]
 
 
 class ToolNode(RunnableCallable):
@@ -807,6 +808,7 @@ class ToolNode(RunnableCallable):
                 context=runtime.context,
                 store=runtime.store,
                 stream_writer=runtime.stream_writer,
+                tools=list(self.tools_by_name.values()),
                 execution_info=runtime.execution_info,
                 server_info=runtime.server_info,
             )
@@ -841,6 +843,7 @@ class ToolNode(RunnableCallable):
                 context=runtime.context,
                 store=runtime.store,
                 stream_writer=runtime.stream_writer,
+                tools=list(self.tools_by_name.values()),
                 execution_info=runtime.execution_info,
                 server_info=runtime.server_info,
             )
@@ -1333,7 +1336,7 @@ class ToolNode(RunnableCallable):
             return tool_call
 
         tool_call_copy: ToolCall = copy(tool_call)
-        injected_args = {}
+        injected_args: dict[str, Any] = {}
 
         # Inject state
         if injected.state:
@@ -1361,14 +1364,20 @@ class ToolNode(RunnableCallable):
             # Extract state values
             if isinstance(state, dict):
                 for tool_arg, state_field in injected.state.items():
-                    injected_args[tool_arg] = (
-                        state[state_field] if state_field else state
-                    )
+                    if not state_field:
+                        injected_args[tool_arg] = state
+                    elif state_field in state:
+                        injected_args[tool_arg] = state[state_field]
+                    elif tool_arg not in injected._optional_state_args:
+                        raise KeyError(state_field)
             else:
                 for tool_arg, state_field in injected.state.items():
-                    injected_args[tool_arg] = (
-                        getattr(state, state_field) if state_field else state
-                    )
+                    if not state_field:
+                        injected_args[tool_arg] = state
+                    elif hasattr(state, state_field):
+                        injected_args[tool_arg] = getattr(state, state_field)
+                    elif tool_arg not in injected._optional_state_args:
+                        raise AttributeError(state_field)
 
         # Inject store
         if injected.store:
@@ -1569,6 +1578,7 @@ class ToolRuntime(_DirectlyInjectedToolArg, Generic[ContextT, StateT]):
     - `context`: Runtime context (shared with `Runtime`)
     - `store`: `BaseStore` instance for persistent storage (shared with `Runtime`)
     - `stream_writer`: `StreamWriter` for streaming output (shared with `Runtime`)
+    - `tools`: List of all available `BaseTool` instances
 
     No `Annotated` wrapper is needed - just use `runtime: ToolRuntime`
     as a parameter.
@@ -1611,6 +1621,7 @@ class ToolRuntime(_DirectlyInjectedToolArg, Generic[ContextT, StateT]):
     context: ContextT
     config: RunnableConfig
     stream_writer: StreamWriter
+    tools: list[BaseTool]
     tool_call_id: str | None
     store: BaseStore | None
     execution_info: ExecutionInfo | None = None
@@ -1859,6 +1870,7 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
     store_arg: str | None = None
     runtime_arg: str | None = None
     all_injected_keys: set[str] = set()
+    _optional_state_args: set[str] = set()
 
     for name, type_ in all_annotations.items():
         # Track all InjectedToolArg-annotated params (including custom subclasses)
@@ -1873,6 +1885,9 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
         if state_inj := _get_injection_from_type(type_, InjectedState):
             if isinstance(state_inj, InjectedState) and state_inj.field:
                 state_args[name] = state_inj.field
+                field_info = full_schema.model_fields.get(name)
+                if field_info and not field_info.is_required():
+                    _optional_state_args.add(name)
             else:
                 state_args[name] = None
 
@@ -1889,4 +1904,5 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
         store=store_arg,
         runtime=runtime_arg,
         all_injected_keys=all_injected_keys,
+        _optional_state_args=_optional_state_args,
     )

libs/prebuilt/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-prebuilt"
-version = "1.0.9"
+version = "1.0.10"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 authors = []
 requires-python = ">=3.10"

libs/prebuilt/tests/test_injected_state_not_required.py

@@ -0,0 +1,285 @@
+"""Test InjectedState with NotRequired state fields.
+
+This tests the fix for https://github.com/langchain-ai/langchain/issues/35585
+
+When using InjectedState(<field>) on a tool parameter, and the referenced field is
+declared as NotRequired in the custom state schema, the ToolNode should gracefully
+handle missing fields by injecting None instead of raising KeyError.
+"""
+
+import sys
+from typing import Annotated
+
+import pytest
+from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, ToolMessage
+from langchain_core.tools import tool
+from langgraph.graph.message import add_messages
+from pydantic import BaseModel, Field
+from typing_extensions import NotRequired
+
+from langgraph.prebuilt import InjectedState, ToolNode, create_react_agent
+from langgraph.prebuilt.chat_agent_executor import AgentState
+
+from .model import FakeToolCallingModel
+
+
+class CustomAgentStateWithNotRequired(AgentState):
+    """Custom state with a NotRequired field (TypedDict style)."""
+
+    city: NotRequired[str]
+
+
+class CustomAgentStatePydanticWithDefault(BaseModel):
+    """Custom state with Optional field and default (Pydantic style)."""
+
+    messages: Annotated[list[AnyMessage], add_messages]
+    remaining_steps: int = Field(default=10)
+    city: str | None = Field(default=None)
+
+
+@tool
+def get_weather(city: Annotated[str | None, InjectedState("city")] = None) -> str:
+    """Get weather for a given city."""
+    if city is None:
+        return "No city provided"
+    return f"It's always sunny in {city}!"
+
+
+def _create_mock_runtime(
+    state: dict | None = None,
+    store=None,
+):
+    """Create a mock Runtime for testing ToolNode directly."""
+    from unittest.mock import Mock
+
+    from langgraph.runtime import Runtime
+
+    mock_runtime = Mock(spec=Runtime)
+    mock_runtime.context = {}
+    return mock_runtime
+
+
+def _create_config_with_runtime(store=None, state=None):
+    """Create a RunnableConfig with mocked runtime for direct ToolNode testing."""
+    from langgraph.prebuilt.tool_node import ToolRuntime
+
+    tool_runtime = ToolRuntime(
+        state=state or {},
+        config={},
+        context={},
+        store=store,
+        stream_writer=None,
+        tools=[],
+        tool_call_id="test_id",
+    )
+    return {
+        "configurable": {
+            "__pregel_runtime": _create_mock_runtime(),
+            "__tool_runtime__": tool_runtime,
+        }
+    }
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
+)
+def test_injected_state_not_required_field_missing_injects_none():
+    """Test that InjectedState with NotRequired field injects None when field is missing.
+
+    This verifies the fix for https://github.com/langchain-ai/langchain/issues/35585
+    """
+    tool_node = ToolNode([get_weather])
+
+    tool_call = {
+        "name": "get_weather",
+        "args": {},
+        "id": "call_1",
+        "type": "tool_call",
+    }
+    ai_msg = AIMessage("Let me check the weather", tool_calls=[tool_call])
+
+    # State WITHOUT the "city" field - should inject None instead of raising KeyError
+    state_without_city: CustomAgentStateWithNotRequired = {
+        "messages": [HumanMessage("What's the weather?"), ai_msg],
+    }
+
+    result = tool_node.invoke(
+        state_without_city,
+        config=_create_config_with_runtime(state=state_without_city),
+    )
+
+    assert len(result["messages"]) == 1
+    tool_msg = result["messages"][0]
+    assert isinstance(tool_msg, ToolMessage)
+    assert "No city provided" in tool_msg.content
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
+)
+def test_injected_state_not_required_field_present_works():
+    """Test that InjectedState with NotRequired field works when field IS present."""
+    tool_node = ToolNode([get_weather])
+
+    tool_call = {
+        "name": "get_weather",
+        "args": {},
+        "id": "call_1",
+        "type": "tool_call",
+    }
+    ai_msg = AIMessage("Let me check the weather", tool_calls=[tool_call])
+
+    # State WITH the "city" field - this should work
+    state_with_city: CustomAgentStateWithNotRequired = {
+        "messages": [HumanMessage("What's the weather?"), ai_msg],
+        "city": "San Francisco",
+    }
+
+    result = tool_node.invoke(
+        state_with_city,
+        config=_create_config_with_runtime(state=state_with_city),
+    )
+
+    assert len(result["messages"]) == 1
+    tool_msg = result["messages"][0]
+    assert isinstance(tool_msg, ToolMessage)
+    assert "San Francisco" in tool_msg.content
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
+)
+def test_create_react_agent_injected_state_not_required_field_missing():
+    """Test create_react_agent with InjectedState using NotRequired field that is missing.
+
+    This verifies the fix for https://github.com/langchain-ai/langchain/issues/35585
+    """
+    model = FakeToolCallingModel(
+        tool_calls=[
+            [{"name": "get_weather", "args": {}, "id": "call_1"}],
+            [],  # No more tool calls, agent should stop
+        ]
+    )
+
+    agent = create_react_agent(
+        model,
+        tools=[get_weather],
+        state_schema=CustomAgentStateWithNotRequired,
+    )
+
+    # Invoke WITHOUT the city field - should work, injecting None
+    result = agent.invoke(
+        {"messages": [HumanMessage("What's the weather?")]},
+    )
+
+    # Check that the tool was called successfully with None injected
+    messages = result["messages"]
+    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
+    assert len(tool_messages) == 1
+    assert "No city provided" in tool_messages[0].content
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
+)
+def test_create_react_agent_injected_state_not_required_field_present():
+    """Test create_react_agent with InjectedState using NotRequired field that IS present."""
+    model = FakeToolCallingModel(
+        tool_calls=[
+            [{"name": "get_weather", "args": {}, "id": "call_1"}],
+            [],  # No more tool calls, agent should stop
+        ]
+    )
+
+    agent = create_react_agent(
+        model,
+        tools=[get_weather],
+        state_schema=CustomAgentStateWithNotRequired,
+    )
+
+    # Invoke WITH the city field
+    result = agent.invoke(
+        {
+            "messages": [HumanMessage("What's the weather?")],
+            "city": "San Francisco",
+        },
+    )
+
+    # Check that the tool was called successfully
+    messages = result["messages"]
+    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
+    assert len(tool_messages) == 1
+    assert "San Francisco" in tool_messages[0].content
+
+
+@tool
+def get_weather_optional(city: Annotated[str | None, InjectedState("city")]) -> str:
+    """Get weather for a given city (accepts None)."""
+    if city is None:
+        return "Please provide a city!"
+    return f"It's always sunny in {city}!"
+
+
+def test_pydantic_state_with_default_field_missing_works():
+    """Test that Pydantic state with Optional field and default=None works when field is missing.
+
+    This is the workaround suggested in the issue comments - using Pydantic BaseModel
+    with `city: Optional[str] = Field(default=None)` instead of TypedDict with NotRequired.
+    """
+    model = FakeToolCallingModel(
+        tool_calls=[
+            [{"name": "get_weather_optional", "args": {}, "id": "call_1"}],
+            [],  # No more tool calls, agent should stop
+        ]
+    )
+
+    agent = create_react_agent(
+        model,
+        tools=[get_weather_optional],
+        state_schema=CustomAgentStatePydanticWithDefault,
+    )
+
+    # Invoke WITHOUT the city field - should work because Pydantic provides default
+    result = agent.invoke(
+        {"messages": [HumanMessage("What's the weather?")]},
+    )
+
+    # Check that the tool was called successfully with None
+    messages = result["messages"]
+    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
+    assert len(tool_messages) == 1
+    assert "Please provide a city!" in tool_messages[0].content
+
+
+def test_pydantic_state_with_default_field_present_works():
+    """Test that Pydantic state with Optional field works when field IS present."""
+    model = FakeToolCallingModel(
+        tool_calls=[
+            [{"name": "get_weather_optional", "args": {}, "id": "call_1"}],
+            [],  # No more tool calls, agent should stop
+        ]
+    )
+
+    agent = create_react_agent(
+        model,
+        tools=[get_weather_optional],
+        state_schema=CustomAgentStatePydanticWithDefault,
+    )
+
+    # Invoke WITH the city field
+    result = agent.invoke(
+        {
+            "messages": [HumanMessage("What's the weather?")],
+            "city": "San Francisco",
+        },
+    )
+
+    # Check that the tool was called successfully
+    messages = result["messages"]
+    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
+    assert len(tool_messages) == 1
+    assert "San Francisco" in tool_messages[0].content

libs/prebuilt/tests/test_tool_node.py

@@ -2016,8 +2016,8 @@ async def test_tool_node_inject_runtime_dynamic_tool_via_wrap_tool_call_async()
     assert tool_message.tool_call_id == "call_dynamic_2"
 
 
-def test_tool_runtime_forwards_execution_info_and_server_info() -> None:
-    """Test that execution_info and server_info are forwarded from Runtime to ToolRuntime."""
+def test_tool_runtime_forwards_execution_info_server_info_and_tools() -> None:
+    """Test that execution_info, server_info, and tools are forwarded from Runtime to ToolRuntime."""
     from langgraph.runtime import ExecutionInfo, ServerInfo
 
     exec_info = ExecutionInfo(
@@ -2043,9 +2043,15 @@ def test_tool_runtime_forwards_execution_info_and_server_info() -> None:
         """Tool that captures runtime info."""
         captured["execution_info"] = runtime.execution_info
         captured["server_info"] = runtime.server_info
+        captured["tools"] = runtime.tools
         return "ok"
 
-    node = ToolNode([info_tool])
+    @dec_tool
+    def other_tool(y: int) -> str:
+        """Another tool available to the runtime."""
+        return str(y)
+
+    node = ToolNode([info_tool, other_tool])
     tool_call = {
         "name": "info_tool",
         "args": {"x": 1},
@@ -2054,17 +2060,21 @@ def test_tool_runtime_forwards_execution_info_and_server_info() -> None:
     }
     msg = AIMessage("", tool_calls=[tool_call])
     config: RunnableConfig = {"configurable": {"__pregel_runtime": mock_runtime}}
-    node.invoke({"messages": [msg]}, config=config)
+    result = node.invoke({"messages": [msg]}, config=config)
 
+    assert result["messages"][-1].content == "ok"
     assert captured["execution_info"] is exec_info
     assert captured["execution_info"].thread_id == "t-1"
     assert captured["execution_info"].task_id == "tk-1"
     assert captured["server_info"] is server_info
     assert captured["server_info"].assistant_id == "asst-1"
+    assert [tool.name for tool in captured["tools"]] == ["info_tool", "other_tool"]
 
 
-async def test_tool_runtime_forwards_execution_info_and_server_info_async() -> None:
-    """Test that execution_info and server_info are forwarded in async path."""
+async def test_tool_runtime_forwards_execution_info_server_info_and_tools_async() -> (
+    None
+):
+    """Test that execution_info, server_info, and tools are forwarded in async path."""
     from langgraph.runtime import ExecutionInfo, ServerInfo
 
     exec_info = ExecutionInfo(
@@ -2090,9 +2100,15 @@ async def test_tool_runtime_forwards_execution_info_and_server_info_async() -> N
         """Async tool that captures runtime info."""
         captured["execution_info"] = runtime.execution_info
         captured["server_info"] = runtime.server_info
+        captured["tools"] = runtime.tools
         return "ok"
 
-    node = ToolNode([info_tool_async])
+    @dec_tool
+    async def other_tool_async(y: int) -> str:
+        """Another async tool available to the runtime."""
+        return str(y)
+
+    node = ToolNode([info_tool_async, other_tool_async])
     tool_call = {
         "name": "info_tool_async",
         "args": {"x": 1},
@@ -2101,12 +2117,17 @@ async def test_tool_runtime_forwards_execution_info_and_server_info_async() -> N
     }
     msg = AIMessage("", tool_calls=[tool_call])
     config: RunnableConfig = {"configurable": {"__pregel_runtime": mock_runtime}}
-    await node.ainvoke({"messages": [msg]}, config=config)
+    result = await node.ainvoke({"messages": [msg]}, config=config)
 
+    assert result["messages"][-1].content == "ok"
     assert captured["execution_info"] is exec_info
     assert captured["execution_info"].thread_id == "t-2"
     assert captured["server_info"] is server_info
     assert captured["server_info"].graph_id == "graph-2"
+    assert [tool.name for tool in captured["tools"]] == [
+        "info_tool_async",
+        "other_tool_async",
+    ]
 
 
 # --- InjectedToolArg security tests ---

libs/prebuilt/uv.lock

@@ -249,7 +249,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.25"
+version = "1.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -261,14 +261,14 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/86/2a/d65de24fc9b7989137253da8973f850f3e39b4ce3e0377bc8200d6b3c189/langchain_core-1.2.25.tar.gz", hash = "sha256:77e032b96509d0eb1f6875042fdf97b7e2334a815314700c6894d9d078909b9c", size = 842347, upload-time = "2026-04-02T22:39:11.528Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/3d/0e/7b31b0249f9b9b0fc7829d5b0ee484b8f8d43c78e376e9951e2ef3eac70c/langchain_core-1.2.25-py3-none-any.whl", hash = "sha256:0c05bf395aec6d2dfa14488fd006f7bcd0540e7e89287e04f92203532a82c828", size = 506866, upload-time = "2026-04-02T22:39:10.137Z" },
+    { url = "https://files.pythonhosted.org/packages/f8/e2/dbfa347aa072a6dc4cd38d6f9ebfc730b4c14c258c47f480f4c5c546f177/langchain_core-1.3.0-py3-none-any.whl", hash = "sha256:baf16ee028475df177b9ab8869a751c79406d64a6f12125b93802991b566cced", size = 515140, upload-time = "2026-04-17T14:51:36.274Z" },
 ]
 
 [[package]]
 name = "langgraph"
-version = "1.1.6"
+version = "1.1.9"
 source = { editable = "../langgraph" }
 dependencies = [
     { name = "langchain-core" },
@@ -281,7 +281,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.1" },
+    { name = "langchain-core", specifier = ">=1.3.0,<2" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-prebuilt", editable = "." },
     { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -352,7 +352,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.0.2"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -490,7 +490,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.0.9"
+version = "1.0.10"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -619,7 +619,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.6.4"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -629,11 +629,12 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e7/85/9c7933052a997da1b85bc5c774f3865e9b1da1c8d71541ea133178b13229/langsmith-0.6.4.tar.gz", hash = "sha256:36f7223a01c218079fbb17da5e536ebbaf5c1468c028abe070aa3ae59bc99ec8", size = 919964, upload-time = "2026-01-15T20:02:28.873Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/66/0f/09a6637a7ba777eb307b7c80852d9ee26438e2bdafbad6fcc849ff9d9192/langsmith-0.6.4-py3-none-any.whl", hash = "sha256:ac4835860160be371042c7adbba3cb267bcf8d96a5ea976c33a8a4acad6c5486", size = 283503, upload-time = "2026-01-15T20:02:26.662Z" },
+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]
 
 [[package]]
@@ -1182,7 +1183,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "9.0.2"
+version = "9.0.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -1193,9 +1194,9 @@ dependencies = [
     { name = "pygments" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
+    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
 ]
 
 [[package]]

libs/sdk-py/uv.lock

@@ -262,7 +262,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.22"
+version = "1.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -274,14 +274,14 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/b1/a3/c4cd6827a1df46c821e7214b7f7b7a28b189e6c9b84ef15c6d629c5e3179/langchain_core-1.2.22.tar.gz", hash = "sha256:8d8f726d03d3652d403da915126626bb6250747e8ba406537d849e68b9f5d058", size = 842487, upload-time = "2026-03-24T18:48:44.9Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/c7/a6/2ffacf0f1a3788f250e75d0b52a24896c413be11be3a6d42bcdf46fbea48/langchain_core-1.2.22-py3-none-any.whl", hash = "sha256:7e30d586b75918e828833b9ec1efc25465723566845dd652c277baf751e9c04b", size = 506829, upload-time = "2026-03-24T18:48:43.286Z" },
+    { url = "https://files.pythonhosted.org/packages/f8/e2/dbfa347aa072a6dc4cd38d6f9ebfc730b4c14c258c47f480f4c5c546f177/langchain_core-1.3.0-py3-none-any.whl", hash = "sha256:baf16ee028475df177b9ab8869a751c79406d64a6f12125b93802991b566cced", size = 515140, upload-time = "2026-04-17T14:51:36.274Z" },
 ]
 
 [[package]]
 name = "langgraph"
-version = "1.1.6"
+version = "1.1.9"
 source = { editable = "../langgraph" }
 dependencies = [
     { name = "langchain-core" },
@@ -294,7 +294,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.1" },
+    { name = "langchain-core", specifier = ">=1.3.0,<2" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-prebuilt", editable = "../prebuilt" },
     { name = "langgraph-sdk", editable = "." },
@@ -365,7 +365,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.0.2"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -413,7 +413,7 @@ test = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "1.0.9"
+version = "1.0.10"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },
@@ -534,7 +534,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.7.20"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -547,9 +547,9 @@ dependencies = [
     { name = "xxhash" },
     { name = "zstandard" },
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