Merge branch 'main' into wfh/cli_validate

update
2026-08-18 13:45:44 +02:00 · 2026-04-08 05:56:49 -07:00 · 2026-04-08 05:47:23 -07:00 · 2026-04-08 05:40:59 -07:00 · 2026-04-08 04:46:31 -07:00 · 2026-04-07 18:20:20 -07:00
351 changed files with 18723 additions and 61091 deletions
@@ -24,7 +24,7 @@ runs:
  using: composite
  steps:
    - name: Install uv and set the python version
-      uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+      uses: astral-sh/setup-uv@v7
      with:
        python-version: ${{ inputs.python-version }}
        enable-cache: ${{ inputs.enable-cache }}
@@ -37,7 +37,7 @@ jobs:
      run:
        working-directory: libs/cli
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Get changed files
        id: changed-files
        if: github.event_name != 'workflow_dispatch'
@@ -121,13 +121,13 @@ jobs:
            exit 1
          fi
          LANGCHAIN_OPENAI_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-openai'); print(v);")
-          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.1.14" ]; then
-            echo "LANGCHAIN_OPENAI_VERSION != 1.1.14; $LANGCHAIN_OPENAI_VERSION"
+          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.0.1" ]; then
+            echo "LANGCHAIN_OPENAI_VERSION != 1.0.1; $LANGCHAIN_OPENAI_VERSION"
            exit 1
          fi
          LANGCHAIN_ANTHROPIC_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-anthropic'); print(v);")
-          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.4.6" ]; then
-            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.4.6; $LANGCHAIN_ANTHROPIC_VERSION"
+          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.0.0a5" ]; then
+            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.0.0a5; $LANGCHAIN_ANTHROPIC_VERSION"
            exit 1
          fi

@@ -31,7 +31,7 @@ jobs:
          - "3.12"
    name: "lint #${{ matrix.python-version }}"
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Get changed files
        id: changed-files
        if: github.event_name != 'workflow_dispatch'
@@ -51,6 +51,16 @@ jobs:
        working-directory: ${{ inputs.working-directory }}
        run: uv sync --frozen --group lint

+      - name: Get .mypy_cache to speed up mypy
+        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        uses: actions/cache@v5
+        env:
+          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
+        with:
+          path: |
+            ${{ inputs.working-directory }}/.mypy_cache
+          key: mypy-lint-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/uv.lock', inputs.working-directory)) }}
+
      - name: Analysing package code with our lint
        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
        working-directory: ${{ inputs.working-directory }}
@@ -67,6 +77,16 @@ jobs:
        working-directory: ${{ inputs.working-directory }}
        run: uv sync --group lint

+      - name: Get .mypy_cache_test to speed up mypy
+        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        uses: actions/cache@v5
+        env:
+          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
+        with:
+          path: |
+            ${{ inputs.working-directory }}/.mypy_cache_test
+          key: mypy-test-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/uv.lock', inputs.working-directory)) }}
+
      - name: Analysing tests with our lint
        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
        working-directory: ${{ inputs.working-directory }}
@@ -1,85 +0,0 @@
-name: sdk-py integration test
-
-on:
-  workflow_call:
-    secrets:
-      LANGSMITH_API_KEY:
-        required: false
-      DOCKERHUB_USERNAME:
-        required: false
-      DOCKERHUB_RO_TOKEN:
-        required: false
-
-permissions:
-  contents: read
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    name: "sdk-py integration"
-    defaults:
-      run:
-        working-directory: libs/sdk-py
-    env:
-      HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-
-      - name: Set up Python
-        uses: ./.github/actions/uv_setup
-        with:
-          python-version: "3.13"
-          cache-suffix: sdk-py-integration
-          working-directory: libs/sdk-py
-
-      - name: Login to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
-        if: ${{ !github.event.pull_request.head.repo.fork }}
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_RO_TOKEN }}
-
-      - name: Install dependencies
-        shell: bash
-        run: uv sync --frozen --group test --no-dev
-
-      - name: Skip if LANGSMITH_API_KEY is not available
-        if: env.HAS_LANGSMITH_API_KEY != 'true'
-        run: |
-          echo "LANGSMITH_API_KEY is not set (likely a fork PR). Skipping integration tests."
-          exit 0
-
-      - name: Bring up integration stack
-        if: env.HAS_LANGSMITH_API_KEY == 'true'
-        working-directory: libs/sdk-py/integration
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-        run: docker compose up -d --build
-
-      - name: Wait for API healthcheck
-        if: env.HAS_LANGSMITH_API_KEY == 'true'
-        run: |
-          for i in $(seq 1 60); do
-            if curl -sf http://localhost:2024/ok >/dev/null; then
-              echo "API ready after ${i}s"
-              exit 0
-            fi
-            sleep 2
-          done
-          echo "API failed to become healthy within 120s"
-          docker compose -f libs/sdk-py/integration/docker-compose.yml logs api | tail -100
-          exit 1
-
-      - name: Run integration suite
-        if: env.HAS_LANGSMITH_API_KEY == 'true'
-        run: uv run pytest tests/integration/ -m integration
-
-      - name: Dump api logs on failure
-        if: failure() && env.HAS_LANGSMITH_API_KEY == 'true'
-        working-directory: libs/sdk-py/integration
-        run: docker compose logs api | tail -200
-
-      - name: Tear down stack
-        if: always() && env.HAS_LANGSMITH_API_KEY == 'true'
-        working-directory: libs/sdk-py/integration
-        run: docker compose down -v
@@ -25,7 +25,7 @@ jobs:

    name: "test #${{ matrix.python-version }}"
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Set up Python ${{ matrix.python-version }}
        uses: ./.github/actions/uv_setup
        with:
@@ -33,7 +33,7 @@ jobs:
          cache-suffix: test-${{ inputs.working-directory }}
          working-directory: ${{ inputs.working-directory }}
      - name: Login to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
        if: ${{ !github.event.pull_request.head.repo.fork }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -23,7 +23,7 @@ jobs:
        working-directory: libs/langgraph
    name: "test #${{ matrix.python-version }}"
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Set up Python ${{ matrix.python-version }}
        uses: ./.github/actions/uv_setup
        with:
@@ -31,7 +31,7 @@ jobs:
          cache-suffix: "test-langgraph"
          working-directory: libs/langgraph
      - name: Login to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
        if: ${{ !github.event.pull_request.head.repo.fork }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -23,7 +23,7 @@ jobs:
      version: ${{ steps.check-version.outputs.version }}

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

      - name: Set up Python ${{ env.PYTHON_VERSION }}
        uses: ./.github/actions/uv_setup
@@ -48,7 +48,7 @@ jobs:
        working-directory: ${{ inputs.working-directory }}

      - name: Upload build
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@v7
        with:
          name: test-dist
          path: ${{ inputs.working-directory }}/dist/
@@ -74,15 +74,15 @@ jobs:
      id-token: write

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v8
        with:
          name: test-dist
          path: ${{ inputs.working-directory }}/dist/

      - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
        with:
          packages-dir: ${{ inputs.working-directory }}/dist/
          verbose: true
@@ -17,7 +17,7 @@ jobs:
      run:
        working-directory: libs/langgraph
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - run: SHA=$(git rev-parse HEAD) && echo "SHA=$SHA" >> $GITHUB_ENV
      - name: Set up Python 3.11
        uses: ./.github/actions/uv_setup
@@ -30,7 +30,7 @@ jobs:
      - name: Run benchmarks
        run: OUTPUT=out/benchmark-baseline.json make -s benchmark
      - name: Save outputs
-        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        uses: actions/cache/save@v5
        with:
          key: ${{ runner.os }}-benchmark-baseline-${{ env.SHA }}
          path: |
@@ -15,7 +15,7 @@ jobs:
      run:
        working-directory: libs/langgraph
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - id: files
        name: Get changed files
        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
@@ -30,7 +30,7 @@ jobs:
      - name: Install dependencies
        run: uv sync --group test
      - name: Download baseline
-        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        uses: actions/cache/restore@v5
        with:
          key: ${{ runner.os }}-benchmark-baseline
          restore-keys: |
@@ -57,19 +57,15 @@ jobs:
            echo EOF
          } >> "$GITHUB_OUTPUT"
      - name: Annotation
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
-        env:
-          CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
-          BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}
-          COMPARE_OUTPUT: ${{ steps.compare.outputs.OUTPUT }}
+        uses: actions/github-script@v8
        with:
          script: |
-            const file = JSON.parse(process.env.CHANGED_FILES || "[]")[0]
-            core.notice(process.env.BENCHMARK_OUTPUT || "", {
+            const file = JSON.parse(`${{ steps.files.outputs.added_modified_renamed }}`)[0]
+            core.notice(`${{ steps.benchmark.outputs.OUTPUT }}`, {
              title: 'Benchmark results',
              file,
            })
-            core.notice(process.env.COMPARE_OUTPUT || "", {
+            core.notice(`${{ steps.compare.outputs.OUTPUT }}`, {
              title: 'Comparison against main',
              file,
            })
@@ -28,10 +28,9 @@ jobs:
    outputs:
      python: ${{ steps.filter.outputs.python || 'true' }}
      deps: ${{ steps.filter.outputs.deps || 'true' }}
-      sdk_py: ${{ steps.filter.outputs.sdk_py || 'true' }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - uses: dorny/paths-filter@7b450fff21473bca461d4b92ce414b9d0420d706 # v4
+      - uses: actions/checkout@v6
+      - uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4
        if: github.event_name != 'workflow_dispatch'
        id: filter
        with:
@@ -48,12 +47,6 @@ jobs:
            deps:
              - '**/pyproject.toml'
              - '**/uv.lock'
-            sdk_py:
-              - 'libs/sdk-py/**'
-              # The integration suite runs the local langgraph core inside the
-              # server (see libs/sdk-py/integration/Dockerfile), so any core
-              # change is now exercised end-to-end and should trigger it.
-              - 'libs/langgraph/**'

  lint:
    needs: changes
@@ -112,9 +105,9 @@ jobs:
    name: "Check SDK methods matching"
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Set up Python
-        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        uses: actions/setup-python@v6
        with:
          python-version: "3.11"
      - name: Run check_sdk_methods script
@@ -130,7 +123,7 @@ jobs:
        python-version:
          - "3.13"
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      - name: Set up Python ${{ matrix.python-version }}
        uses: ./.github/actions/uv_setup
        with:
@@ -163,13 +156,6 @@ jobs:
    uses: ./.github/workflows/_integration_test.yml
    secrets: inherit

-  sdk-py-integration-test:
-    needs: changes
-    if: needs.changes.outputs.sdk_py == 'true'
-    name: "sdk-py integration test"
-    uses: ./.github/workflows/_sdk_integration_test.yml
-    secrets: inherit
-
  ci_success:
    name: "CI Success"
    needs:
@@ -180,7 +166,6 @@ jobs:
        check-sdk-methods,
        check-schema,
        integration-test,
-        sdk-py-integration-test,
      ]
    if: |
      always()
@@ -26,10 +26,10 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        uses: actions/checkout@v6

      - name: Setup Python
-        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        uses: actions/setup-python@v6
        with:
          python-version: '3.11'

@@ -37,13 +37,13 @@ jobs:
        run: python docs/generate_redirects.py

      - name: Setup Pages
-        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0
+        uses: actions/configure-pages@v6

      - name: Upload artifact
-        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
+        uses: actions/upload-pages-artifact@v4
        with:
          path: 'docs/_site'

      - name: Deploy to GitHub Pages
        id: deployment
-        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0
+        uses: actions/deploy-pages@v5
@@ -41,7 +41,6 @@ jobs:
            docs
            ci
            deps
-            deps-dev
          requireScope: false
          ignoreLabels: |
            ignore-lint-pr-title
@@ -13,6 +13,7 @@ permissions:

 env:
  PYTHON_VERSION: "3.11"
+  GO_VERSION: "1.23"

 jobs:
  build:
@@ -25,16 +26,79 @@ jobs:
      tag: ${{ steps.check-version.outputs.tag }}

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

      - name: Set up Python
        uses: ./.github/actions/uv_setup
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache-suffix: "release"
-          enable-cache: false
          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
+
+      - 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="langgraph_cli/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
+          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,
@@ -47,11 +111,12 @@ 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 }}

      - name: Upload build
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@v7
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/
@@ -87,7 +152,7 @@ jobs:
    outputs:
      release-body: ${{ steps.generate-release-body.outputs.release-body }}
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
        with:
          repository: langchain-ai/langgraph
          path: langgraph
@@ -158,7 +223,7 @@ jobs:
      - test-pypi-publish
    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

      # We explicitly *don't* set up caching here. This ensures our tests are
      # maximally sensitive to catching breakage.
@@ -262,23 +327,22 @@ jobs:
        working-directory: ${{ inputs.working-directory }}

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

      - name: Set up Python
        uses: ./.github/actions/uv_setup
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache-suffix: "release"
-          enable-cache: false
          working-directory: ${{ inputs.working-directory }}

-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v8
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/

      - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
        with:
          packages-dir: ${{ inputs.working-directory }}/dist/
          verbose: true
@@ -304,17 +368,16 @@ jobs:
        working-directory: ${{ inputs.working-directory }}

    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6

      - name: Set up Python
        uses: ./.github/actions/uv_setup
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache-suffix: "release"
-          enable-cache: false
          working-directory: ${{ inputs.working-directory }}

-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v8
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/
@@ -26,7 +26,7 @@ jobs:

    steps:
      - name: Find and reopen matching PRs
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -50,7 +50,7 @@ jobs:
    steps:
      - name: Check for issue link and assignee
        id: check-link
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -283,7 +283,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -312,7 +312,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          steps.check-link.outputs.has-link == 'true' && steps.check-link.outputs.is-assigned == 'true'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -366,7 +366,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -55,7 +55,7 @@ jobs:
    steps:
      - name: Generate GitHub App token
        id: app-token
-        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        uses: actions/create-github-app-token@v3
        with:
          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
@@ -63,7 +63,7 @@ jobs:
      - name: Check if contributor is external
        if: steps.app-token.outcome == 'success'
        id: check-membership
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -102,7 +102,7 @@ jobs:

      - name: Apply contributor tier label
        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
@@ -155,7 +155,7 @@ jobs:

      - name: Add external label
        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
@@ -168,7 +168,7 @@ jobs:

      - name: Add internal label
        if: steps.check-membership.outputs.is-external == 'false'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
@@ -190,13 +190,13 @@ jobs:
    steps:
      - name: Generate GitHub App token
        id: app-token
-        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        uses: actions/create-github-app-token@v3
        with:
          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}

      - name: Backfill labels
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -40,7 +40,7 @@ jobs:
    steps:
      - name: Generate GitHub App token
        id: app-token
-        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        uses: actions/create-github-app-token@v3
        with:
          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
@@ -48,7 +48,7 @@ jobs:
      - name: Check if contributor is external
        if: steps.app-token.outcome == 'success'
        id: check-membership
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -90,7 +90,7 @@ jobs:
      # event fires and triggers require_issue_link.yml.
      - name: Apply contributor tier label
        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          # Use App token so the "labeled" event propagates to downstream
          # workflows (e.g. require_issue_link.yml).
@@ -145,7 +145,7 @@ jobs:

      - name: Add external label
        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          # Use App token so the "labeled" event propagates to downstream
          # workflows (e.g. require_issue_link.yml). Events created by the
@@ -161,7 +161,7 @@ jobs:

      - name: Add internal label
        if: steps.check-membership.outputs.is-external == 'false'
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        uses: actions/github-script@v8
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
@@ -16,7 +16,7 @@ jobs:
    runs-on: ubuntu-latest
    
    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v6
      
      - name: Set up uv
        uses: ./.github/actions/uv_setup
@@ -28,7 +28,7 @@ jobs:
        run: make lock-upgrade
          
      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8
+        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: "chore(deps): upgrade dependencies with `uv lock --upgrade`"
@@ -100,4 +100,3 @@ dmypy.json
 .turbo
 .editorconfig
 .scratch
-.worktrees/
@@ -16,7 +16,7 @@
  <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langgraph" alt="PyPI - License"></a>
  <a href="https://pypistats.org/packages/langgraph" target="_blank"><img src="https://img.shields.io/pepy/dt/langgraph" alt="PyPI - Downloads"></a>
  <a href="https://pypi.org/project/langgraph/" target="_blank"><img src="https://img.shields.io/pypi/v/langgraph.svg?label=%20" alt="Version"></a>
-  <a href="https://x.com/langchain_oss" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
+  <a href="https://x.com/langchain" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
 </div>

 <br>
@@ -27,10 +27,10 @@ Trusted by companies shaping the future of agents – including Klarna, Replit,
 pip install -U langgraph
 ```

-> [!TIP]
-> If you're looking to quickly build agents, check out **[Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview)** — a higher-level package built on LangGraph for agents that can plan, use subagents, and leverage file systems for complex tasks.
+If you're looking to quickly build agents with LangChain's `create_agent` (built on LangGraph), check out the [LangChain Agents documentation](https://docs.langchain.com/oss/python/langchain/agents).

-For an equivalent JS/TS library, check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
+> [!NOTE]
+> Looking for the JS/TS library? Check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).

 ## Why use LangGraph?

@@ -51,7 +51,7 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L

 To improve your LLM application development, pair LangGraph with:

- [Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview) – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
+- [Deep Agents](https://github.com/langchain-ai/deepagents) *(new!)* – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
 - [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
 - [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
 - [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).
@@ -1,11 +1,3 @@
 # LangGraph examples

-This directory is retained purely for archival purposes and is no longer updated.
-
-## 🤔 What is this?
-
-The examples previously found here have been moved to the consolidated LangChain documentation. This directory remains available for historical reference, but new examples and usage guidance are published in the docs.
-
-## 📖 Documentation
-
-For up-to-date LangGraph examples, tutorials, and guides, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview). Get started with the [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart).
+This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview). Please refer to the LangChain docs for the most up-to-date examples and usage guidelines for LangGraph.
@@ -1,132 +0,0 @@
-# delta-channel-dump
-
-Recover messages (and other channels) from a Postgres-backed LangGraph thread
-written by **langgraph >= 1.2** (DeltaChannel format) — including **LangGraph
-Server / langgraph-api** deployments on the Postgres runtime, **deepagents
-0.6.x**, or any OSS app using `PostgresSaver` — before rolling back to an older
-runtime such as **deepagents 0.5.x / langgraph < 1.2**.
-
-langgraph-api uses the same `checkpoints` / `checkpoint_blobs` / `checkpoint_writes`
-schema as OSS `checkpoint-postgres`; this script reads those tables directly.
-
-On the older runtime, `add_messages` does not understand the `EXT_DELTA_SNAPSHOT`
-msgpack ext code and silently returns an empty list for affected channels. This
-tool reads the raw checkpoint blobs from Postgres and emits JSON you can inspect
-and re-apply via `update_state` (LangGraph Server SDK) or `graph.update_state`
-(OSS).
-
-## Install
-
-```bash
-pip install "psycopg[binary]" ormsgpack
-```
-
-## Run
-
-```bash
-export DATABASE_URI=postgres://user:pass@host:5432/dbname
-python3 dump.py \
-    --thread-id <uuid> \
-    --channel messages \
-    [--channel files ...] \
-    [--checkpoint-id <uuid>] \
-    [--checkpoint-ns ""] \
-    --output recovery.json
-```
-
- `--thread-id` (required): thread UUID
- `--channel` (required, repeatable): channel names to recover
- `--checkpoint-id` (optional): target checkpoint; defaults to latest
- `--checkpoint-ns` (optional): namespace; defaults to `""`
- `--database-uri` (optional): Postgres URI; defaults to `DATABASE_URI` env var
- `--output` (optional): output file; defaults to stdout
-
-## Output
-
-```json
-{
-  "thread_id": "...",
-  "checkpoint_ns": "",
-  "target_checkpoint_id": "...",
-  "parent_checkpoint_id": "...",
-  "channels": {
-    "messages": {
-      "delta_kind": "snapshot",
-      "seed_checkpoint_id": "...",
-      "seed_version": "...",
-      "seed": [{ "type": "ai", "content": "...", "id": "ai-0" }],
-      "writes": [
-        {
-          "checkpoint_id": "...",
-          "task_id": "...",
-          "idx": 0,
-          "value": [{ "type": "ai", "content": "...", "id": "ai-10" }]
-        }
-      ]
-    }
-  }
-}
-```
-
-`delta_kind` is one of:
-
- `snapshot` — DeltaChannel snapshot blob (`channel_values[ch] == true`)
- `legacy_plain` — pre-DeltaChannel inline or blob value
- `no_seed` — walked to root without finding a populated ancestor
-
-`writes` are ordered oldest-to-newest (the order a reducer would replay them).
-
-## Reducing back to a single list
-
-For deepagents-style messages, combine seed and writes, then deduplicate:
-
-```python
-import json
-
-data = json.load(open("recovery.json"))
-ch = data["channels"]["messages"]
-messages = list(ch["seed"] or [])
-for w in ch["writes"]:
-    messages.extend(w["value"] or [])
-
-# Dedup by id, keep last; drop RemoveMessage tombstones
-by_id = {}
-for m in messages:
-    if isinstance(m, dict) and m.get("type") == "remove":
-        by_id.pop(m.get("id"), None)
-    elif isinstance(m, dict) and m.get("id"):
-        by_id[m["id"]] = m
-    else:
-        by_id[id(m)] = m
-reduced = list(by_id.values())
-```
-
-This approximates `_messages_delta_reducer` semantics; adjust for your graph.
-
-## Re-applying
-
-```python
-from langgraph_sdk import get_client
-
-client = get_client(url="http://localhost:8123")
-await client.threads.update_state(
-    thread_id,
-    values={"messages": reduced},
-)
-```
-
-Review the recovered JSON before calling `update_state`. This tool is
-read-only and intentionally does not mutate the database.
-
-## Scope / non-goals (v1)
-
- **Postgres only** — OSS `PostgresSaver` or langgraph-api Postgres runtime; not
-  inmem, gRPC core, Mongo, or Redis checkpointer backends
- **No AES decryption** (`LANGGRAPH_AES_KEY`) or custom encryption
- **No reducer** — raw seed + writes only
- **No automatic `update_state`** — operator applies manually
-
-## Copying
-
-`dump.py` is self-contained. Copy it anywhere; only `psycopg[binary]` and
-`ormsgpack` are required at runtime. No langgraph imports.
@@ -1,469 +0,0 @@
-#!/usr/bin/env python3
-"""Recover delta-channel state from a Postgres-backed LangGraph thread.
-
-Works with OSS ``PostgresSaver`` and LangGraph Server / langgraph-api on the
-Postgres runtime (same checkpoint schema). Use after rolling back from
-langgraph >= 1.2 / deepagents 0.6.x to an older runtime that does not
-understand ``EXT_DELTA_SNAPSHOT`` msgpack blobs. The script walks the checkpoint
-parent chain, decodes msgpack blobs, and emits a JSON dump of per-channel
-``seed`` plus oldest-to-newest ``writes``. Apply the recovered values manually
-via ``client.threads.update_state(...)`` (Server) or ``graph.update_state``
-(OSS).
-
-Install::
-
-    pip install "psycopg[binary]" ormsgpack
-
-Run::
-
-    export DATABASE_URI=postgres://...
-    python3 dump.py --thread-id <uuid> --channel messages --output recovery.json
-
-Scope (v1): Postgres only; no AES/custom encryption; no reducer application.
-"""
-
-from __future__ import annotations
-
-import argparse
-import base64
-import json
-import os
-import sys
-import uuid
-from typing import Any
-
-import ormsgpack
-import psycopg
-
-# LangGraph msgpack EXT type codes (langgraph/checkpoint/serde/jsonplus.py).
-EXT_CONSTRUCTOR_SINGLE_ARG = 0
-EXT_CONSTRUCTOR_POS_ARGS = 1
-EXT_CONSTRUCTOR_KW_ARGS = 2
-EXT_METHOD_SINGLE_ARG = 3
-EXT_PYDANTIC_V1 = 4
-EXT_PYDANTIC_V2 = 5
-EXT_NUMPY_ARRAY = 6
-EXT_DELTA_SNAPSHOT = 7
-
-_MSGPACK_OPTION = ormsgpack.OPT_NON_STR_KEYS
-
-
-def ext_hook(code: int, data: bytes) -> Any:
-    """Decode LangGraph msgpack EXT payloads to JSON-friendly Python values."""
-    if code == EXT_DELTA_SNAPSHOT:
-        inner = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
-        return {"__delta_snapshot__": inner}
-    if code == EXT_CONSTRUCTOR_SINGLE_ARG:
-        try:
-            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
-            if tup[0] == "uuid" and tup[1] == "UUID":
-                hex_ = tup[2]
-                return (
-                    f"{hex_[:8]}-{hex_[8:12]}-{hex_[12:16]}-"
-                    f"{hex_[16:20]}-{hex_[20:]}"
-                )
-            return tup[2]
-        except Exception:
-            return None
-    if code == EXT_CONSTRUCTOR_POS_ARGS:
-        try:
-            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
-            if tup[0] == "langgraph.types" and tup[1] == "Send":
-                args = tup[2]
-                if len(args) == 2:
-                    return {"__send__": {"node": args[0], "arg": args[1]}}
-                return {
-                    "__send__": {
-                        "node": args[0],
-                        "arg": args[1],
-                        "timeout": args[2],
-                    }
-                }
-            return tup[2]
-        except Exception:
-            return None
-    if code in (EXT_CONSTRUCTOR_KW_ARGS, EXT_METHOD_SINGLE_ARG):
-        try:
-            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
-            return tup[2]
-        except Exception:
-            return None
-    if code in (EXT_PYDANTIC_V1, EXT_PYDANTIC_V2):
-        try:
-            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
-            return tup[2]
-        except Exception:
-            return None
-    if code == EXT_NUMPY_ARRAY:
-        try:
-            dtype_str, shape, order, buf = ormsgpack.unpackb(
-                data, ext_hook=ext_hook, option=_MSGPACK_OPTION
-            )
-            return {
-                "__numpy_array__": {
-                    "dtype": dtype_str,
-                    "shape": shape,
-                    "order": order,
-                    "data_b64": base64.b64encode(buf).decode("ascii"),
-                }
-            }
-        except Exception:
-            return None
-    return None
-
-
-def decode_blob(blob_type: str, blob_bytes: bytes | None) -> Any:
-    if blob_type in ("empty", "null") or blob_bytes is None:
-        return None
-    if blob_type == "msgpack":
-        return ormsgpack.unpackb(
-            blob_bytes, ext_hook=ext_hook, option=_MSGPACK_OPTION
-        )
-    if blob_type in ("bytes", "bytearray"):
-        return base64.b64encode(blob_bytes).decode("ascii")
-    raise RuntimeError(
-        f"Unknown blob type {blob_type!r}. "
-        "AES/custom-encrypted deployments are out of scope for v1."
-    )
-
-
-def delta_unwrap(value: Any) -> Any:
-    if isinstance(value, dict) and "__delta_snapshot__" in value:
-        return value["__delta_snapshot__"]
-    return value
-
-
-def json_default(obj: Any) -> Any:
-    if isinstance(obj, (bytes, bytearray)):
-        return base64.b64encode(bytes(obj)).decode("ascii")
-    if isinstance(obj, uuid.UUID):
-        return str(obj)
-    raise TypeError(f"Object of type {type(obj).__name__} is not JSON serializable")
-
-
-def resolve_target_checkpoint_id(
-    conn: psycopg.Connection[Any],
-    thread_id: str,
-    checkpoint_ns: str,
-    checkpoint_id: str | None,
-) -> str:
-    if checkpoint_id is not None:
-        return checkpoint_id
-    row = conn.execute(
-        """
-        SELECT checkpoint_id::text
-        FROM checkpoints
-        WHERE thread_id = %s AND checkpoint_ns = %s
-        ORDER BY checkpoint_id DESC
-        LIMIT 1
-        """,
-        (thread_id, checkpoint_ns),
-    ).fetchone()
-    if row is None:
-        raise SystemExit(
-            f"No checkpoints found for thread_id={thread_id!r} "
-            f"checkpoint_ns={checkpoint_ns!r}"
-        )
-    return row[0]
-
-
-def _load_checkpoint(
-    conn: psycopg.Connection[Any],
-    thread_id: str,
-    checkpoint_ns: str,
-    checkpoint_id: str,
-) -> tuple[dict[str, Any], str | None] | None:
-    row = conn.execute(
-        """
-        SELECT checkpoint, parent_checkpoint_id::text
-        FROM checkpoints
-        WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
-        """,
-        (thread_id, checkpoint_ns, checkpoint_id),
-    ).fetchone()
-    if row is None:
-        return None
-    return row[0], row[1]
-
-
-def _load_seed(
-    conn: psycopg.Connection[Any],
-    *,
-    thread_id: str,
-    checkpoint_ns: str,
-    channel: str,
-    checkpoint_id: str,
-    channel_values: dict[str, Any],
-    channel_versions: dict[str, str],
-) -> dict[str, Any]:
-    cv = channel_values[channel]
-    version = channel_versions.get(channel)
-    if cv is True:
-        blob_row = conn.execute(
-            """
-            SELECT type, blob
-            FROM checkpoint_blobs
-            WHERE thread_id = %s AND checkpoint_ns = %s
-              AND channel = %s AND version = %s
-            """,
-            (thread_id, checkpoint_ns, channel, version),
-        ).fetchone()
-        seed_value = None
-        if blob_row is not None and blob_row[0] != "empty":
-            seed_value = delta_unwrap(decode_blob(blob_row[0], blob_row[1]))
-        return {
-            "delta_kind": "snapshot",
-            "seed_checkpoint_id": checkpoint_id,
-            "seed_version": version,
-            "seed": seed_value,
-        }
-    if isinstance(cv, (int, float, str, bool)) or cv is None:
-        return {
-            "delta_kind": "legacy_plain",
-            "seed_checkpoint_id": checkpoint_id,
-            "seed_version": version,
-            "seed": cv,
-        }
-    blob_row = conn.execute(
-        """
-        SELECT type, blob
-        FROM checkpoint_blobs
-        WHERE thread_id = %s AND checkpoint_ns = %s
-          AND channel = %s AND version = %s
-        """,
-        (thread_id, checkpoint_ns, channel, version),
-    ).fetchone()
-    seed_value = cv if blob_row is None else decode_blob(blob_row[0], blob_row[1])
-    return {
-        "delta_kind": "legacy_plain",
-        "seed_checkpoint_id": checkpoint_id,
-        "seed_version": version,
-        "seed": seed_value,
-    }
-
-
-def _load_writes_for_checkpoint(
-    conn: psycopg.Connection[Any],
-    *,
-    thread_id: str,
-    checkpoint_ns: str,
-    checkpoint_id: str,
-    channel: str,
-) -> list[dict[str, Any]]:
-    """Load writes for one checkpoint, newest-first by ``(task_id, idx)``.
-
-    ``walk_channel`` reverses the accumulated flat list before returning;
-    DESC here yields oldest-first within each checkpoint in the final output,
-    matching ``PostgresSaver._build_delta_channels_writes_history``.
-    """
-    rows = conn.execute(
-        """
-        SELECT task_id::text, idx, type, blob
-        FROM checkpoint_writes
-        WHERE thread_id = %s AND checkpoint_ns = %s
-          AND checkpoint_id = %s AND channel = %s
-        ORDER BY task_id DESC, idx DESC
-        """,
-        (thread_id, checkpoint_ns, checkpoint_id, channel),
-    ).fetchall()
-    return [
-        {
-            "checkpoint_id": checkpoint_id,
-            "task_id": task_id,
-            "idx": idx,
-            "value": decode_blob(blob_type, blob_bytes),
-        }
-        for task_id, idx, blob_type, blob_bytes in rows
-    ]
-
-
-def walk_channel(
-    conn: psycopg.Connection[Any],
-    *,
-    thread_id: str,
-    checkpoint_ns: str,
-    start_checkpoint_id: str | None,
-    channel: str,
-) -> dict[str, Any]:
-    """Walk one channel's parent chain from target.parent backward to seed."""
-    chain_writes_newest_first: list[dict[str, Any]] = []
-    cur = start_checkpoint_id
-    while cur is not None:
-        loaded = _load_checkpoint(conn, thread_id, checkpoint_ns, cur)
-        if loaded is None:
-            break
-        checkpoint_json, parent_id = loaded
-        channel_values = checkpoint_json.get("channel_values") or {}
-        channel_versions = checkpoint_json.get("channel_versions") or {}
-
-        chain_writes_newest_first.extend(
-            _load_writes_for_checkpoint(
-                conn,
-                thread_id=thread_id,
-                checkpoint_ns=checkpoint_ns,
-                checkpoint_id=cur,
-                channel=channel,
-            )
-        )
-
-        if channel in channel_values:
-            seed = _load_seed(
-                conn,
-                thread_id=thread_id,
-                checkpoint_ns=checkpoint_ns,
-                channel=channel,
-                checkpoint_id=cur,
-                channel_values=channel_values,
-                channel_versions=channel_versions,
-            )
-            seed["writes"] = list(reversed(chain_writes_newest_first))
-            return seed
-
-        cur = parent_id
-
-    return {
-        "delta_kind": "no_seed",
-        "seed_checkpoint_id": None,
-        "seed_version": None,
-        "seed": None,
-        "writes": list(reversed(chain_writes_newest_first)),
-    }
-
-
-def walk_parent_chain(
-    conn: psycopg.Connection[Any],
-    *,
-    thread_id: str,
-    checkpoint_ns: str,
-    target_checkpoint_id: str,
-    channels: list[str],
-) -> tuple[str | None, dict[str, dict[str, Any]]]:
-    """Walk parent chain and return per-channel seed + writes (oldest-first)."""
-    parent_row = conn.execute(
-        """
-        SELECT parent_checkpoint_id::text
-        FROM checkpoints
-        WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
-        """,
-        (thread_id, checkpoint_ns, target_checkpoint_id),
-    ).fetchone()
-    if parent_row is None:
-        raise SystemExit(
-            f"Checkpoint {target_checkpoint_id!r} not found for thread {thread_id!r}"
-        )
-    parent_checkpoint_id = parent_row[0]
-
-    result = {
-        ch: walk_channel(
-            conn,
-            thread_id=thread_id,
-            checkpoint_ns=checkpoint_ns,
-            start_checkpoint_id=parent_checkpoint_id,
-            channel=ch,
-        )
-        for ch in channels
-    }
-    return parent_checkpoint_id, result
-
-
-def build_output(
-    *,
-    thread_id: str,
-    checkpoint_ns: str,
-    target_checkpoint_id: str,
-    parent_checkpoint_id: str | None,
-    channels: dict[str, dict[str, Any]],
-) -> dict[str, Any]:
-    return {
-        "thread_id": thread_id,
-        "checkpoint_ns": checkpoint_ns,
-        "target_checkpoint_id": target_checkpoint_id,
-        "parent_checkpoint_id": parent_checkpoint_id,
-        "channels": channels,
-    }
-
-
-def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
-    parser = argparse.ArgumentParser(
-        description=(
-            "Recover delta-channel seed + writes from Postgres checkpoint data."
-        ),
-    )
-    parser.add_argument("--thread-id", required=True, help="Thread UUID")
-    parser.add_argument(
-        "--channel",
-        action="append",
-        required=True,
-        dest="channels",
-        help="Channel name (repeatable)",
-    )
-    parser.add_argument(
-        "--checkpoint-id",
-        default=None,
-        help="Target checkpoint UUID (default: latest for thread)",
-    )
-    parser.add_argument(
-        "--checkpoint-ns",
-        default="",
-        help='Checkpoint namespace (default: "")',
-    )
-    parser.add_argument(
-        "--database-uri",
-        default=os.environ.get("DATABASE_URI"),
-        help="Postgres URI (default: DATABASE_URI env var)",
-    )
-    parser.add_argument(
-        "--output",
-        default="-",
-        help="Output JSON file path (default: stdout)",
-    )
-    return parser.parse_args(argv)
-
-
-def main(argv: list[str] | None = None) -> int:
-    args = parse_args(argv)
-    if not args.database_uri:
-        print(
-            "error: --database-uri or DATABASE_URI is required",
-            file=sys.stderr,
-        )
-        return 2
-
-    thread_id = str(uuid.UUID(args.thread_id))
-    channels = list(dict.fromkeys(args.channels))
-
-    with psycopg.connect(args.database_uri) as conn:
-        target_checkpoint_id = resolve_target_checkpoint_id(
-            conn,
-            thread_id,
-            args.checkpoint_ns,
-            args.checkpoint_id,
-        )
-        parent_checkpoint_id, channel_data = walk_parent_chain(
-            conn,
-            thread_id=thread_id,
-            checkpoint_ns=args.checkpoint_ns,
-            target_checkpoint_id=target_checkpoint_id,
-            channels=channels,
-        )
-
-    output = build_output(
-        thread_id=thread_id,
-        checkpoint_ns=args.checkpoint_ns,
-        target_checkpoint_id=target_checkpoint_id,
-        parent_checkpoint_id=parent_checkpoint_id,
-        channels=channel_data,
-    )
-    payload = json.dumps(output, indent=2, default=json_default)
-
-    if args.output == "-":
-        print(payload)
-    else:
-        with open(args.output, "w", encoding="utf-8") as f:
-            f.write(payload)
-            f.write("\n")
-    return 0
-
-
-if __name__ == "__main__":
-    raise SystemExit(main())
@@ -1,27 +1,15 @@
-# LangGraph Checkpoint Conformance
+# langgraph-checkpoint-conformance

-[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-conformance?label=%20)](https://pypi.org/project/langgraph-checkpoint-conformance/#history)
-[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-conformance)](https://opensource.org/licenses/MIT)
-[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-conformance)](https://pypistats.org/packages/langgraph-checkpoint-conformance)
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
+Conformance test suite for [LangGraph](https://github.com/langchain-ai/langgraph) checkpointer implementations.

-To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
-[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
+Validates that a `BaseCheckpointSaver` subclass correctly implements the checkpoint storage contract — blob round-trips, metadata preservation, namespace isolation, incremental channel updates, and more.

-## Quick Install
+## Installation

 ```bash
-uv add langgraph-checkpoint-conformance
+pip install langgraph-checkpoint-conformance
 ```

-## 🤔 What is this?
-
-This library provides a conformance test suite for [LangGraph](https://github.com/langchain-ai/langgraph) checkpointer implementations. It validates that a `BaseCheckpointSaver` subclass correctly implements the checkpoint storage contract — blob round-trips, metadata preservation, namespace isolation, incremental channel updates, and more.
-
-## 📖 Documentation
-
-For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph/). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
-
 ## Quick start

 Register your checkpointer with `@checkpointer_test` and run `validate()`:
@@ -75,7 +63,6 @@ The suite tests **base** capabilities (required) and **extended** capabilities (
 | `delete_for_runs` | no | `adelete_for_runs` |
 | `copy_thread` | no | `acopy_thread` |
 | `prune` | no | `aprune` |
-| `delta_channel_history` | no | `aget_delta_channel_history` |

 Extended capabilities are detected by checking whether the method is overridden from `BaseCheckpointSaver`. If not overridden, those tests are skipped.

@@ -122,13 +109,3 @@ async def pg_checkpointer():
    async with PostgresSaver.from_conn_string(CONN_STRING) as saver:
        yield saver
 ```
-
-## 📕 Releases & Versioning
-
-See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
-
-## 💁 Contributing
-
-As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
-
-For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
@@ -23,7 +23,6 @@ class Capability(str, Enum):
    DELETE_FOR_RUNS = "delete_for_runs"
    COPY_THREAD = "copy_thread"
    PRUNE = "prune"
-    DELTA_CHANNEL_HISTORY = "delta_channel_history"


 # Capabilities that every checkpointer must support.
@@ -43,7 +42,6 @@ EXTENDED_CAPABILITIES = frozenset(
        Capability.DELETE_FOR_RUNS,
        Capability.COPY_THREAD,
        Capability.PRUNE,
-        Capability.DELTA_CHANNEL_HISTORY,
    }
 )

@@ -59,7 +57,6 @@ _CAPABILITY_METHOD_MAP: dict[Capability, str] = {
    Capability.DELETE_FOR_RUNS: "adelete_for_runs",
    Capability.COPY_THREAD: "acopy_thread",
    Capability.PRUNE: "aprune",
-    Capability.DELTA_CHANNEL_HISTORY: "aget_delta_channel_history",
 }


@@ -9,9 +9,6 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
    run_delete_thread_tests,
 )
-from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
-    run_delta_channel_history_tests,
-)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -27,5 +24,4 @@ __all__ = [
    "run_delete_for_runs_tests",
    "run_copy_thread_tests",
    "run_prune_tests",
-    "run_delta_channel_history_tests",
 ]
@@ -1,99 +0,0 @@
-"""Shared fixtures for delta-channel conformance tests.
-
-Builds a parent chain with `_DeltaSnapshot` blobs at known positions via
-direct `aput` / `aput_writes` calls. No langgraph or Pregel dependency.
-"""
-
-from __future__ import annotations
-
-from collections.abc import Sequence
-from typing import Any
-from uuid import uuid4
-
-from langchain_core.runnables import RunnableConfig
-from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
-from langgraph.checkpoint.base.id import uuid6
-
-from langgraph.checkpoint.conformance.test_utils import generate_metadata
-
-
-async def build_delta_chain(
-    saver: BaseCheckpointSaver,
-    *,
-    thread_id: str | None = None,
-    checkpoint_ns: str = "",
-    channel: str = "messages",
-    snapshots_at_steps: Sequence[int] = (0,),
-    total_steps: int = 6,
-    write_value_fn: Any | None = None,
-) -> list[RunnableConfig]:
-    """Build a parent chain with `_DeltaSnapshot` at known positions.
-
-    Args:
-        saver: Checkpointer instance.
-        thread_id: Defaults to a random UUID.
-        checkpoint_ns: Namespace (default root).
-        channel: Channel name used for snapshots and writes.
-        snapshots_at_steps: Steps at which a `_DeltaSnapshot` blob is stored
-            in `channel_values[channel]`. Step 0 is the oldest checkpoint.
-        total_steps: Number of checkpoints in the chain.
-        write_value_fn: Callable(step) -> write value. Defaults to step index.
-
-    Returns:
-        List of stored configs (oldest first), one per step.
-    """
-    if write_value_fn is None:
-
-        def write_value_fn(step: int) -> Any:
-            return step
-
-    from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-    thread_id = thread_id or str(uuid4())
-    snapshot_set = set(snapshots_at_steps)
-    stored: list[RunnableConfig] = []
-    parent_cfg: RunnableConfig | None = None
-
-    for step in range(total_steps):
-        config: RunnableConfig = {
-            "configurable": {
-                "thread_id": thread_id,
-                "checkpoint_ns": checkpoint_ns,
-            }
-        }
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-
-        channel_values: dict[str, Any] = {}
-        channel_versions: dict[str, int] = {}
-        if step in snapshot_set:
-            channel_values[channel] = _DeltaSnapshot(
-                write_value_fn(step),
-            )
-            channel_versions[channel] = step + 1
-
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=channel_values,
-            channel_versions=channel_versions,
-            versions_seen={},
-            updated_channels=None,
-        )
-        new_versions = dict(channel_versions)
-        parent_cfg = await saver.aput(
-            config, cp, generate_metadata(step=step), new_versions
-        )
-        stored.append(parent_cfg)
-
-        # Write a pending write for non-snapshot steps so the walk has
-        # something to collect.
-        if step not in snapshot_set:
-            await saver.aput_writes(
-                parent_cfg, [(channel, write_value_fn(step))], str(uuid4())
-            )
-
-    return stored
@@ -1,307 +0,0 @@
-"""DELTA_CHANNEL_HISTORY capability tests — aget_delta_channel_history contract."""
-
-from __future__ import annotations
-
-import traceback
-from collections.abc import Callable
-from uuid import uuid4
-
-from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
-from langgraph.checkpoint.base.id import uuid6
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-from langgraph.checkpoint.conformance.spec._delta_fixtures import build_delta_chain
-from langgraph.checkpoint.conformance.test_utils import generate_metadata
-
-
-async def test_history_returns_writes_oldest_first(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Writes are returned oldest-to-newest."""
-    tid = str(uuid4())
-    # 5 steps: snapshot at 0, writes at 1,2,3,4.
-    # Head is step 4. Walk starts at step 3 (parent of head).
-    # Collects writes from steps 1,2,3 (between snapshot at 0 and head's parent).
-    configs = await build_delta_chain(
-        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=5
-    )
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-    writes = result["ch"]["writes"]
-    values = [w[2] for w in writes]
-    assert values == [1, 2, 3], f"Expected [1,2,3], got {values}"
-
-
-async def test_history_seed_is_nearest_snapshot(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Seed is the value from the nearest ancestor with channel_values populated."""
-    tid = str(uuid4())
-    # 6 steps: snapshots at 0 and 3, writes at 1,2,4,5.
-    # Head is step 5. Walk from step 4 backward stops at step 3 (snapshot).
-    # Collects writes from step 4 only (between step 3 and head's parent step 4).
-    configs = await build_delta_chain(
-        saver,
-        thread_id=tid,
-        channel="ch",
-        snapshots_at_steps=[0, 3],
-        total_steps=6,
-    )
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-    assert "seed" in result["ch"], "Expected seed from snapshot at step 3"
-    seed = result["ch"]["seed"]
-    actual_value = seed.value if isinstance(seed, _DeltaSnapshot) else seed
-    assert actual_value == 3, f"Expected seed value 3 (step 3), got {actual_value}"
-    writes = result["ch"]["writes"]
-    values = [w[2] for w in writes]
-    assert values == [4], f"Expected [4], got {values}"
-
-
-async def test_history_excludes_target_pending_writes(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Target's own pending_writes are NOT included in the history."""
-    tid = str(uuid4())
-    configs = await build_delta_chain(
-        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
-    )
-    head = configs[-1]
-    # Add writes directly to the head checkpoint
-    await saver.aput_writes(head, [("ch", "extra")], str(uuid4()))
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-    writes = result["ch"]["writes"]
-    values = [w[2] for w in writes]
-    assert "extra" not in values, f"Target's writes should be excluded, got {values}"
-
-
-async def test_history_multi_channel(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Multiple channels have independent walk termination."""
-    tid = str(uuid4())
-    configs: list = []
-    parent_cfg = None
-
-    for step in range(5):
-        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-        cv: dict = {}
-        cvs: dict = {}
-        if step == 1:
-            cv["a"] = _DeltaSnapshot("snap_a")
-            cvs["a"] = step + 1
-        if step == 3:
-            cv["b"] = _DeltaSnapshot("snap_b")
-            cvs["b"] = step + 1
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=cv,
-            channel_versions=cvs,
-            versions_seen={},
-            updated_channels=None,
-        )
-        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
-        configs.append(parent_cfg)
-        await saver.aput_writes(parent_cfg, [("a", step), ("b", step)], str(uuid4()))
-
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["a", "b"])
-    a_writes = [w[2] for w in result["a"]["writes"]]
-    b_writes = [w[2] for w in result["b"]["writes"]]
-    assert a_writes == [1, 2, 3], f"Expected a writes [1,2,3], got {a_writes}"
-    assert b_writes == [3], f"Expected b writes [3], got {b_writes}"
-
-
-async def test_history_empty_channels_returns_empty(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Empty channels list returns empty mapping."""
-    tid = str(uuid4())
-    configs = await build_delta_chain(
-        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
-    )
-    result = await saver.aget_delta_channel_history(config=configs[-1], channels=[])
-    assert result == {}
-
-
-async def test_history_walk_to_root_no_seed(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Walk reaches root without finding seed — no 'seed' key in result."""
-    tid = str(uuid4())
-    configs = await build_delta_chain(
-        saver,
-        thread_id=tid,
-        channel="ch",
-        snapshots_at_steps=[],
-        total_steps=4,
-    )
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-    assert "seed" not in result["ch"], f"Expected no seed, got {result['ch']}"
-
-
-async def test_history_migration_plain_value_as_seed(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Pre-delta plain value in channel_values acts as seed (migration case).
-
-    When a thread was originally using a regular channel (BinaryOperatorAggregate)
-    and later switches to DeltaChannel, the old checkpoint has a plain value in
-    channel_values[ch] (not a _DeltaSnapshot). The walk should treat it as the
-    seed and terminate there.
-    """
-    tid = str(uuid4())
-    configs: list = []
-    parent_cfg = None
-
-    for step in range(4):
-        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-        cv: dict = {}
-        cvs: dict = {}
-        # Step 1: plain value (migration case — old checkpoint before delta)
-        if step == 1:
-            cv["ch"] = [10, 20, 30]
-            cvs["ch"] = step + 1
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=cv,
-            channel_versions=cvs,
-            versions_seen={},
-            updated_channels=None,
-        )
-        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
-        configs.append(parent_cfg)
-        if step != 1:
-            await saver.aput_writes(parent_cfg, [("ch", step)], str(uuid4()))
-
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-    # Seed should be the plain value from step 1
-    assert "seed" in result["ch"], "Expected seed from migration plain value at step 1"
-    seed = result["ch"]["seed"]
-    assert seed == [10, 20, 30], f"Expected plain value [10,20,30], got {seed}"
-    # Writes should be from step 2 only (between seed at step 1 and head's parent step 2)
-    writes = result["ch"]["writes"]
-    values = [w[2] for w in writes]
-    assert values == [2], f"Expected [2], got {values}"
-
-
-async def test_history_seed_ancestor_own_writes_are_replayed(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Writes stored AT the seed ancestor must be included in `writes`.
-
-    A stored value is the state ENTERING its checkpoint; the writes stored
-    under that same checkpoint are what produced its child and are therefore
-    NOT subsumed by it. Only writes at ancestors OLDER than the seed are
-    subsumed, and the walk terminates before reaching them.
-
-    This holds for plain-value seeds (migration from a pre-delta channel type)
-    exactly as it does for `_DeltaSnapshot` seeds. Skipping the seed
-    ancestor's own writes silently drops the first post-migration write.
-    """
-    tid = str(uuid4())
-    configs: list = []
-    parent_cfg = None
-
-    # Each step's write is labelled by the role it plays, so the assertion
-    # below reads directly rather than by step index.
-    writes_by_step = {
-        0: "older-than-seed",  # subsumed by the value stored at step 1
-        1: "at-seed",  # the seed's own write, produced step 2
-        2: "after-seed",  # delta-era write on the path to the head
-        3: "pending-at-head",  # pending for the next step, never replayed
-    }
-    # Steps 0 and 1 store a plain value; 1 is the nearest, so it is the seed.
-    values_by_step = {0: [10], 1: [10, 20]}
-
-    for step in range(4):
-        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-        cv: dict = {}
-        cvs: dict = {}
-        if step in values_by_step:
-            cv["ch"] = values_by_step[step]
-            cvs["ch"] = step + 1
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=cv,
-            channel_versions=cvs,
-            versions_seen={},
-            updated_channels=None,
-        )
-        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
-        configs.append(parent_cfg)
-        await saver.aput_writes(
-            parent_cfg, [("ch", writes_by_step[step])], str(uuid4())
-        )
-
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-
-    assert "seed" in result["ch"], "Expected seed from plain value at step 1"
-    assert result["ch"]["seed"] == [10, 20], (
-        f"Expected nearest plain value [10, 20], got {result['ch']['seed']}"
-    )
-    values = [w[2] for w in result["ch"]["writes"]]
-    assert values == ["at-seed", "after-seed"], (
-        f'Expected ["at-seed", "after-seed"], got {values}'
-    )
-
-
-ALL_DELTA_CHANNEL_HISTORY_TESTS = [
-    test_history_returns_writes_oldest_first,
-    test_history_seed_is_nearest_snapshot,
-    test_history_excludes_target_pending_writes,
-    test_history_multi_channel,
-    test_history_empty_channels_returns_empty,
-    test_history_walk_to_root_no_seed,
-    test_history_migration_plain_value_as_seed,
-    test_history_seed_ancestor_own_writes_are_replayed,
-]
-
-
-async def run_delta_channel_history_tests(
-    saver: BaseCheckpointSaver,
-    on_test_result: Callable[[str, str, bool, str | None], None] | None = None,
-) -> tuple[int, int, list[str]]:
-    """Run all delta_channel_history tests. Returns (passed, failed, failure_names)."""
-    passed = 0
-    failed = 0
-    failures: list[str] = []
-    for test_fn in ALL_DELTA_CHANNEL_HISTORY_TESTS:
-        try:
-            await test_fn(saver)
-            passed += 1
-            if on_test_result:
-                on_test_result("delta_channel_history", test_fn.__name__, True, None)
-        except Exception:
-            failed += 1
-            msg = f"{test_fn.__name__}: {traceback.format_exc()}"
-            failures.append(msg)
-            if on_test_result:
-                on_test_result(
-                    "delta_channel_history",
-                    test_fn.__name__,
-                    False,
-                    traceback.format_exc(),
-                )
-    return passed, failed, failures
@@ -4,7 +4,6 @@ from __future__ import annotations

 import traceback
 from collections.abc import Callable
-from typing import cast
 from uuid import uuid4

 from langgraph.checkpoint.base import BaseCheckpointSaver
@@ -336,9 +335,9 @@ async def test_list_metadata_custom_keys(
        results.append(tup)

    assert len(results) == 1
-    metadata = cast(dict[str, object], results[0].metadata)
-    assert metadata["score"] == 42
-    assert metadata["run_id"] == "run-abc"
+    assert results[0].metadata["score"] == 42
+    assert results[0].metadata["run_id"] == "run-abc"
+


 ALL_LIST_TESTS = [
@@ -19,9 +19,6 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
    run_delete_thread_tests,
 )
-from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
-    run_delta_channel_history_tests,
-)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -38,7 +35,6 @@ _RUNNERS = {
    Capability.DELETE_FOR_RUNS: run_delete_for_runs_tests,
    Capability.COPY_THREAD: run_copy_thread_tests,
    Capability.PRUNE: run_prune_tests,
-    Capability.DELTA_CHANNEL_HISTORY: run_delta_channel_history_tests,
 }


@@ -43,11 +43,7 @@ asyncio_mode = "auto"
 # The extended methods (acopy_thread, adelete_for_runs, aprune) are checked
 # at runtime via capability detection and may not exist on the installed
 # base class. Dict literal inference is also overly strict for RunnableConfig.
-# Delta-channel tests import from `langgraph` (not a declared dep of this
-# package — at test time it is installed alongside); private `_DeltaSnapshot`
-# imports are intentional (beta surface).
 unresolved-attribute = "ignore"
-unresolved-import = "ignore"
 invalid-argument-type = "ignore"
 invalid-return-type = "ignore"

@@ -58,19 +54,10 @@ lint.select = [
  "UP", # pyupgrade
  "B",  # flake8-bugbear
  "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
 ]
 lint.ignore = ["E501", "B008"]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"

-[tool.uv.sources]
-langgraph-checkpoint = {path = "../checkpoint", editable = true}
-
 [[tool.uv.index]]
 name = "testpypi"
 url = "https://test.pypi.org/simple/"
@@ -47,19 +47,22 @@ test_watch:

 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
+MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
+lint_tests: MYPY_CACHE=.mypy_cache_test

 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)" = "" ] || uv run ty check $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 type:
-	uv run ty check $(PYTHON_FILES)
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
@@ -1,33 +1,10 @@
 # LangGraph Checkpoint Postgres

-[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-postgres?label=%20)](https://pypi.org/project/langgraph-checkpoint-postgres/#history)
-[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-postgres)](https://opensource.org/licenses/MIT)
-[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-postgres)](https://pypistats.org/packages/langgraph-checkpoint-postgres)
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
+Implementation of LangGraph CheckpointSaver that uses Postgres.

-To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
-[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
+## Dependencies

-## Quick Install
-
-```bash
-uv add langgraph-checkpoint-postgres
-```
-
-## 🤔 What is this?
-
-This library provides a Postgres implementation of LangGraph's checkpoint saver. Use it when you want LangGraph state persistence backed by Postgres for durable, long-running workflows and agents.
-
-By default, `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) without any extras. You can choose a specific installation that best suits your needs in the [Psycopg installation docs](https://www.psycopg.org/psycopg3/docs/basic/install.html), for example `psycopg[binary]`.
-
-## 📖 Documentation
-
-For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint.postgres). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
-
-## 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.
+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]`).

 ## Usage

@@ -38,12 +15,10 @@ For full documentation, see the [API reference](https://reference.langchain.com/
 > When manually creating Postgres connections and passing them to `PostgresSaver` or `AsyncPostgresSaver`, make sure to include `autocommit=True` and `row_factory=dict_row` (`from psycopg.rows import dict_row`). See a full example in this [how-to guide](https://langchain-ai.github.io/langgraph/how-tos/persistence_postgres/).
 >
 > **Why these parameters are required:**
->
 > - `autocommit=True`: Required for the `.setup()` method to properly commit the checkpoint tables to the database. Without this, table creation may not be persisted.
 > - `row_factory=dict_row`: Required because the PostgresSaver implementation accesses database rows using dictionary-style syntax (e.g., `row["column_name"]`). The default `tuple_row` factory returns tuples that only support index-based access (e.g., `row[0]`), which will cause `TypeError` exceptions when the checkpointer tries to access columns by name.
 >
 > **Example of incorrect usage:**
->
 > ```python
 > # ❌ This will fail with TypeError during checkpointer operations
 > with psycopg.connect(DB_URI) as conn:  # Missing autocommit=True and row_factory=dict_row
@@ -67,12 +42,24 @@ with PostgresSaver.from_conn_string(DB_URI) as checkpointer:
        "v": 4,
        "ts": "2024-07-31T20:14:19.804150+00:00",
        "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {"my_key": "meow", "node": "node"},
-        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
+        "channel_values": {
+            "my_key": "meow",
+            "node": "node"
+        },
+        "channel_versions": {
+            "__start__": 2,
+            "my_key": 3,
+            "start:node": 3,
+            "node": 3
+        },
        "versions_seen": {
            "__input__": {},
-            "__start__": {"__start__": 1},
-            "node": {"start:node": 2},
+            "__start__": {
+            "__start__": 1
+            },
+            "node": {
+            "start:node": 2
+            }
        },
    }

@@ -96,12 +83,24 @@ async with AsyncPostgresSaver.from_conn_string(DB_URI) as checkpointer:
        "v": 4,
        "ts": "2024-07-31T20:14:19.804150+00:00",
        "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {"my_key": "meow", "node": "node"},
-        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
+        "channel_values": {
+            "my_key": "meow",
+            "node": "node"
+        },
+        "channel_versions": {
+            "__start__": 2,
+            "my_key": 3,
+            "start:node": 3,
+            "node": 3
+        },
        "versions_seen": {
            "__input__": {},
-            "__start__": {"__start__": 1},
-            "node": {"start:node": 2},
+            "__start__": {
+            "__start__": 1
+            },
+            "node": {
+            "start:node": 2
+            }
        },
    }

@@ -114,13 +113,3 @@ async with AsyncPostgresSaver.from_conn_string(DB_URI) as checkpointer:
    # list checkpoints
    [c async for c in checkpointer.alist(read_config)]
 ```
-
-## 📕 Releases & Versioning
-
-See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
-
-## 💁 Contributing
-
-As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
-
-For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
@@ -2,9 +2,9 @@ from __future__ import annotations

 import threading
 from collections import defaultdict
-from collections.abc import Iterator, Mapping, Sequence
+from collections.abc import Iterator, Sequence
 from contextlib import contextmanager
-from typing import Any, cast
+from typing import Any

 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,25 +13,17 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
    get_checkpoint_id,
    get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import Capabilities, Connection, Cursor, Pipeline
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import ConnectionPool

 from langgraph.checkpoint.postgres import _internal
-from langgraph.checkpoint.postgres.base import (
-    _DELTA_PAGE_SIZE,
-    BasePostgresSaver,
-    _build_delta_stage1_sql,
-    _build_delta_stage2_sql,
-    _DeltaStage2Row,
-)
+from langgraph.checkpoint.postgres.base import BasePostgresSaver
 from langgraph.checkpoint.postgres.shallow import ShallowPostgresSaver

 Conn = _internal.Conn  # For backward compatibility
@@ -223,7 +215,7 @@ class PostgresSaver(BasePostgresSaver):
            >>> checkpoint_tuple = memory.get_tuple(config)
            >>> print(checkpoint_tuple)
            CheckpointTuple(...)
-        """
+        """  # noqa
        thread_id = config["configurable"]["thread_id"]
        checkpoint_id = get_checkpoint_id(config)
        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
@@ -310,10 +302,7 @@ class PostgresSaver(BasePostgresSaver):
        # others are stored in blobs table
        blob_values = {}
        for k, v in checkpoint["channel_values"].items():
-            if isinstance(v, _DeltaSnapshot):
-                blob_values[k] = copy["channel_values"].pop(k)
-                copy["channel_values"][k] = True
-            elif v is None or isinstance(v, (str, int, float, bool)):
+            if v is None or isinstance(v, (str, int, float, bool)):
                pass
            else:
                blob_values[k] = copy["channel_values"].pop(k)
@@ -441,121 +430,6 @@ class PostgresSaver(BasePostgresSaver):
                with conn.cursor(binary=True, row_factory=dict_row) as cur:
                    yield cur

-    def get_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
-
-        Two-stage query, both stages cover ALL requested channels:
-
-        * Stage 1 (paged): dynamic SELECT over `checkpoints` with K parallel
-          JSONB key lookups (one column pair per channel) — no subquery, no
-          aggregation. Pages newest-first by `checkpoint_id` with a cursor;
-          page size is `_DELTA_PAGE_SIZE`. Stops paging when every channel
-          has found its seed or the chain is exhausted.
-
-        * Stage 2 (per-channel UNION ALL): one branch per channel reading
-          `checkpoint_writes` filtered to that channel's specific
-          `chain_cids`, plus one branch per channel that has a seed reading
-          `checkpoint_blobs` for that channel + version. Avoids the
-          over-fetch of a single `channel = ANY(channels)` filter when
-          channels have different chain depths.
-        """
-        if not channels:
-            return {}
-        channels = list(channels)
-        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 = self.get_tuple(config)
-            if target is None:
-                return {ch: {"writes": []} for ch in channels}
-            checkpoint_id = target.config["configurable"]["checkpoint_id"]
-
-        # Stage 1: paged K-JSONB-lookup scan, walking the parent chain in
-        # Python after each page. Stops as soon as every channel has its seed.
-        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
-        parent_of: dict[str, str | None] = {}
-        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
-        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
-        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
-        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
-        seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
-        seed_inline_by_ch: dict[str, Any] = {}
-        walk_cursor_by_ch: dict[str, str | None] = {}
-        seeded: set[str] = set()
-        cursor: str | None = None
-
-        with self._cursor() as cur:
-            while True:
-                stage1_params: list[Any] = []
-                for ch in channels:
-                    # ver_i, blob channel, blob version, inline_i
-                    stage1_params.extend([ch, ch, ch, ch])
-                stage1_params.extend(
-                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
-                )
-                cur.execute(stage1_sql, stage1_params)
-                page = cur.fetchall()
-                if not page:
-                    break
-                oldest = self._ingest_stage1_page(
-                    cast("list[Mapping[str, Any]]", page),
-                    channels,
-                    parent_of,
-                    ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
-                )
-                self._try_advance_walks(
-                    checkpoint_id,
-                    channels,
-                    parent_of,
-                    ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
-                    chain_by_ch,
-                    seed_ver_by_ch,
-                    seed_inline_by_ch,
-                    walk_cursor_by_ch,
-                    seeded,
-                )
-                # Stop if every channel is seeded, or the page was short
-                # (chain exhausted — no more rows to fetch).
-                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
-                    break
-                cursor = oldest
-
-        # Stage 2: per-channel UNION ALL — one writes branch per channel
-        # with non-empty chain, plus one blob branch per seeded channel.
-        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
-        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
-        stage2_sql = _build_delta_stage2_sql(
-            channels_with_chain=channels_with_chain,
-            channels_with_seed=channels_with_seed,
-        )
-
-        if stage2_sql:
-            stage2_params: list[Any] = []
-            for ch in channels_with_chain:
-                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
-            for ch in channels_with_seed:
-                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
-            with self._cursor() as cur:
-                cur.execute(stage2_sql, stage2_params)
-                stage2_rows = cur.fetchall()
-        else:
-            stage2_rows = []
-
-        return self._build_delta_channels_writes_history(
-            channels=channels,
-            chain_by_ch=chain_by_ch,
-            seed_ver_by_ch=seed_ver_by_ch,
-            seed_inline_by_ch=seed_inline_by_ch,
-            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
-        )
-
    def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
        """
        Convert a database row into a CheckpointTuple object.
@@ -2,9 +2,9 @@ from __future__ import annotations

 import asyncio
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import asynccontextmanager
-from typing import Any, cast
+from typing import Any

 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,25 +13,17 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
    get_checkpoint_id,
    get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import AsyncConnection, AsyncCursor, AsyncPipeline, Capabilities
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import AsyncConnectionPool

 from langgraph.checkpoint.postgres import _ainternal
-from langgraph.checkpoint.postgres.base import (
-    _DELTA_PAGE_SIZE,
-    BasePostgresSaver,
-    _build_delta_stage1_sql,
-    _build_delta_stage2_sql,
-    _DeltaStage2Row,
-)
+from langgraph.checkpoint.postgres.base import BasePostgresSaver
 from langgraph.checkpoint.postgres.shallow import AsyncShallowPostgresSaver

 Conn = _ainternal.Conn  # For backward compatibility
@@ -269,10 +261,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
        # others are stored in blobs table
        blob_values = {}
        for k, v in checkpoint["channel_values"].items():
-            if isinstance(v, _DeltaSnapshot):
-                blob_values[k] = copy["channel_values"].pop(k)
-                copy["channel_values"][k] = True
-            elif v is None or isinstance(v, (str, int, float, bool)):
+            if v is None or isinstance(v, (str, int, float, bool)):
                pass
            else:
                blob_values[k] = copy["channel_values"].pop(k)
@@ -402,104 +391,6 @@ class AsyncPostgresSaver(BasePostgresSaver):
                async with conn.cursor(binary=True, row_factory=dict_row) as cur:
                    yield cur

-    async def aget_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
-
-        See `PostgresSaver.get_delta_channel_history` for design notes; this is
-        the async equivalent with internal stage-1 paging and per-channel
-        UNION ALL stage-2.
-        """
-        if not channels:
-            return {}
-        channels = list(channels)
-        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 {ch: {"writes": []} for ch in channels}
-            checkpoint_id = target.config["configurable"]["checkpoint_id"]
-
-        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
-        parent_of: dict[str, str | None] = {}
-        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
-        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
-        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
-        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
-        seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
-        seed_inline_by_ch: dict[str, Any] = {}
-        walk_cursor_by_ch: dict[str, str | None] = {}
-        seeded: set[str] = set()
-        cursor: str | None = None
-
-        async with self._cursor() as cur:
-            while True:
-                stage1_params: list[Any] = []
-                for ch in channels:
-                    # ver_i, blob channel, blob version, inline_i
-                    stage1_params.extend([ch, ch, ch, ch])
-                stage1_params.extend(
-                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
-                )
-                await cur.execute(stage1_sql, stage1_params)
-                page = await cur.fetchall()
-                if not page:
-                    break
-                oldest = self._ingest_stage1_page(
-                    cast("list[Mapping[str, Any]]", page),
-                    channels,
-                    parent_of,
-                    ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
-                )
-                self._try_advance_walks(
-                    checkpoint_id,
-                    channels,
-                    parent_of,
-                    ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
-                    chain_by_ch,
-                    seed_ver_by_ch,
-                    seed_inline_by_ch,
-                    walk_cursor_by_ch,
-                    seeded,
-                )
-                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
-                    break
-                cursor = oldest
-
-        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
-        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
-        stage2_sql = _build_delta_stage2_sql(
-            channels_with_chain=channels_with_chain,
-            channels_with_seed=channels_with_seed,
-        )
-
-        if stage2_sql:
-            stage2_params: list[Any] = []
-            for ch in channels_with_chain:
-                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
-            for ch in channels_with_seed:
-                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
-            async with self._cursor() as cur:
-                await cur.execute(stage2_sql, stage2_params)
-                stage2_rows = await cur.fetchall()
-        else:
-            stage2_rows = []
-
-        return self._build_delta_channels_writes_history(
-            channels=channels,
-            chain_by_ch=chain_by_ch,
-            seed_ver_by_ch=seed_ver_by_ch,
-            seed_inline_by_ch=seed_inline_by_ch,
-            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
-        )
-
    async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
        """
        Convert a database row into a CheckpointTuple object.
@@ -580,7 +471,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
        while True:
            try:
                yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]
+                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
                    self.loop,
                ).result()
            except StopAsyncIteration:
@@ -2,26 +2,20 @@ from __future__ import annotations

 import random
 import warnings
-from collections.abc import Mapping, Sequence
+from collections.abc import Sequence
 from importlib.metadata import version as get_version
-from typing import Any, TypedDict, cast
+from typing import Any, cast

 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
    WRITES_IDX_MAP,
    BaseCheckpointSaver,
    ChannelVersions,
-    DeltaChannelHistory,
-    PendingWrite,
    get_checkpoint_id,
 )
 from langgraph.checkpoint.serde.types import TASKS
 from psycopg.types.json import Jsonb

-# Page size for stage-1 paged scan in `get_delta_channel_history`. Internal
-# constant — exposing this as a kwarg is left as a follow-up.
-_DELTA_PAGE_SIZE = 1024
-
 MetadataInput = dict[str, Any] | None

 try:
@@ -159,188 +153,6 @@ INSERT_CHECKPOINT_WRITES_SQL = """
 """


-class _DeltaStage2Row(TypedDict, total=False):
-    """One row from `_build_delta_stage2_sql` (a UNION ALL of writes and blobs)."""
-
-    _kind: str  # "w" or "b"
-    checkpoint_id: str | None  # "w" rows only
-    channel: str | None  # set on both "w" and "b" rows
-    type: str | None
-    blob: bytes | None
-    task_id: str | None  # "w" rows only
-    idx: int | None  # "w" rows only
-    version: str | None  # "b" rows only
-
-
-# Multi-channel two-stage DeltaChannel reconstruction.
-#
-# Stage 1 scans checkpoint metadata (no blob bytes) and emits one row per
-# checkpoint with K parallel JSONB key lookups (one column pair per
-# requested delta channel: ver_i / hs_i).  No subqueries, no aggregation.
-# Python walks the parent chain once across all channels.
-#
-# Stage 2 fetches all writes and the seed blobs for ALL channels in a
-# single roundtrip via `channel = ANY(%s)` and chain/seed-version
-# filtering.
-#
-# Empirical comparison vs an alternative "ship full channel_versions /
-# channel_values JSONB and let Python pick" form (1000 checkpoints,
-# 8 total channels in graph, 3 delta channels requested):
-#
-#   Postgres execution:    A=0.24ms vs B=0.38ms   (both negligible)
-#   End-to-end latency:    A=6.83ms vs B=2.28ms   (B is 3.0x faster)
-#   Wire payload:          A=836KB  vs B=330KB    (61% smaller)
-#   Buffer hits:           identical (167 blocks)
-#
-# B (this dynamic-columns design) wins because it avoids JSONB
-# serialization on the wire and JSONB-to-dict deserialization in
-# psycopg.  Even at K=8 (8 delta channels = 16 dynamic columns), B
-# still beats A end-to-end (4.2ms vs 6.8ms).
-
-
-def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
-    """Build stage 1 SQL with K parallel version lookups + seed probes.
-
-    For channels=["messages", "files"] (with `paged=True`) the result is::
-
-        SELECT checkpoint_id, parent_checkpoint_id,
-               checkpoint -> 'channel_versions' ->> %s AS ver_0,
-               EXISTS (SELECT 1 FROM checkpoint_blobs b0
-                       WHERE b0.thread_id = checkpoints.thread_id
-                         AND b0.checkpoint_ns = checkpoints.checkpoint_ns
-                         AND b0.channel = %s
-                         AND b0.version = checkpoint -> 'channel_versions' ->> %s
-                         AND b0.type <> 'empty') AS hb_0,
-               checkpoint -> 'channel_values' -> %s AS inline_0,
-               checkpoint -> 'channel_versions' ->> %s AS ver_1,
-               EXISTS (...) AS hb_1,
-               checkpoint -> 'channel_values' -> %s AS inline_1
-        FROM checkpoints
-        WHERE thread_id = %s AND checkpoint_ns = %s
-          AND (%s::text IS NULL OR checkpoint_id < %s)
-        ORDER BY checkpoint_id DESC
-        LIMIT %s
-
-    A stored value for a channel lives in one of two places, because `put`
-    splits them:
-
-    * **blob** — non-primitive values (and `_DeltaSnapshot`) are moved to
-      `checkpoint_blobs`. `hb_i` ("has blob") probes for one. The probe hits
-      that table's primary key `(thread_id, checkpoint_ns, channel, version)`
-      exactly, so it is an index lookup per row per channel.
-    * **inline** — `None`, `str`, `int`, `float` and `bool` stay in the
-      checkpoint's own `channel_values` and get no blob row at all. `inline_i`
-      returns that value.
-
-    Testing only for a key in `channel_values` (the previous approach) missed
-    blob-stored plain values, since `put` leaves an inline marker there for
-    `_DeltaSnapshot` but not for a plain value — which is what a thread
-    migrated from a pre-delta channel type leaves behind. Probing only the
-    blobs table would conversely miss inline primitives. Both are needed, and
-    the caller treats "either present" as the seed.
-
-    `hb_i` also disambiguates the two: for a `_DeltaSnapshot`, `inline_i` is the
-    literal `true` marker rather than the value, so a blob must win over an
-    inline reading whenever one exists. That ordering is what makes a genuine
-    inline `true` (a bool channel) distinguishable from the marker.
-
-    The `type <> 'empty'` predicate mirrors the check stage 2 already applies
-    when resolving the seed blob. `put` does not currently produce `empty` rows
-    on this path — `blob_versions` is filtered to keys present in
-    `channel_values`, so `_dump_blobs`' empty branch is unreachable from it —
-    but without the predicate the two stages could disagree: stage 1 would
-    terminate the walk on a row stage 2 then discards, yielding no seed *and* a
-    truncated write chain, which is the failure this function exists to avoid.
-
-    Channel names are passed as `%s` parameters (safe from SQL injection).
-    Only the column aliases `ver_i` / `hb_i` / `inline_i` and the subquery alias
-    `b{i}` are interpolated into the SQL string (i is bounded by len(channels)
-    and uses safe identifiers).
-
-    Caller must extend params with `[ch_0 x4, ch_1 x4, ..., thread_id, ns,
-    cursor, cursor, page_size]` when `paged=True` — four per channel: the
-    version lookup, the blob's channel, the version the blob must match, and the
-    inline lookup.
-
-    When `paged=False`, the WHERE has no cursor predicate and there's no
-    LIMIT/ORDER BY — kept as a non-public helper for tests/diagnostics.
-    """
-    cols = []
-    for i in range(len(channels)):
-        cols.append(
-            f"checkpoint -> 'channel_versions' ->> %s AS ver_{i}, "
-            f"EXISTS (SELECT 1 FROM checkpoint_blobs b{i} "
-            f"WHERE b{i}.thread_id = checkpoints.thread_id "
-            f"AND b{i}.checkpoint_ns = checkpoints.checkpoint_ns "
-            f"AND b{i}.channel = %s "
-            f"AND b{i}.version = checkpoint -> 'channel_versions' ->> %s "
-            f"AND b{i}.type <> 'empty') AS hb_{i}, "
-            f"checkpoint -> 'channel_values' -> %s AS inline_{i}"
-        )
-    sql = (
-        "SELECT checkpoint_id, parent_checkpoint_id, "
-        + ", ".join(cols)
-        + " FROM checkpoints WHERE thread_id = %s AND checkpoint_ns = %s"
-    )
-    if paged:
-        sql += (
-            " AND (%s::text IS NULL OR checkpoint_id < %s)"
-            " ORDER BY checkpoint_id DESC LIMIT %s"
-        )
-    return sql
-
-
-def _build_delta_stage2_sql(
-    *,
-    channels_with_chain: Sequence[str],
-    channels_with_seed: Sequence[str],
-) -> str:
-    """Build stage 2 SQL as a per-channel UNION ALL.
-
-    For each channel with a non-empty chain, emit one branch reading
-    `checkpoint_writes` for that specific channel + chain_cids. For each
-    channel with a seed_version, emit one branch reading `checkpoint_blobs`
-    for that channel + version. This avoids the over-fetch of the prior
-    `channel = ANY(channels) AND checkpoint_id = ANY(union)` form when
-    channels have different chain depths.
-
-    The caller must pass parameters in matching order:
-
-        for ch in channels_with_chain:
-            params += [thread_id, checkpoint_ns, ch, chain_cids[ch]]
-        for ch in channels_with_seed:
-            params += [thread_id, checkpoint_ns, ch, seed_version[ch]]
-
-    Returns an empty SQL string if both channel lists are empty (caller
-    must skip executing in that case).
-    """
-    branches: list[str] = []
-    for _ in channels_with_chain:
-        branches.append(
-            "SELECT 'w'::text AS _kind, "
-            "checkpoint_id, channel, "
-            "type, blob, task_id, idx, NULL::text AS version "
-            "FROM checkpoint_writes "
-            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
-            "AND checkpoint_id = ANY(%s)"
-        )
-    for _ in channels_with_seed:
-        branches.append(
-            "SELECT 'b'::text AS _kind, NULL::text AS checkpoint_id, channel, "
-            "type, blob, NULL::text AS task_id, NULL::int AS idx, version "
-            "FROM checkpoint_blobs "
-            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
-            "AND version = %s"
-        )
-    return " UNION ALL ".join(branches)
-
-
-# Stage 1 rows are dynamic-shape dicts: {checkpoint_id, parent_checkpoint_id,
-# ver_0, hs_0, ver_1, hs_1, ...}.  Walking is parameterized by the channel
-# list to map indices back to channel names — no static TypedDict here.
-# `dict[str, Any]` is the practical signature.
-
-
 class BasePostgresSaver(BaseCheckpointSaver[str]):
    SELECT_SQL = SELECT_SQL
    SELECT_PENDING_SENDS_SQL = SELECT_PENDING_SENDS_SQL
@@ -383,169 +195,6 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
            if t.decode() != "empty"
        }

-    @staticmethod
-    def _ingest_stage1_page(
-        stage1_rows: Sequence[Mapping[str, Any]],
-        channels: Sequence[str],
-        parent_of: dict[str, str | None],
-        ver_by_i_by_cid: list[dict[str, str | None]],
-        hb_by_i_by_cid: list[dict[str, bool]],
-        inline_by_i_by_cid: list[dict[str, Any]],
-    ) -> str | None:
-        """Fold one stage-1 page into the running walk-state mappings.
-
-        Returns the oldest checkpoint_id seen on this page (smallest, since
-        pages come back DESC). Caller uses it as the cursor for the next
-        page (`AND checkpoint_id < cursor`).
-        """
-        oldest: str | None = None
-        for r in stage1_rows:
-            cid = cast(str, r["checkpoint_id"])
-            parent_of[cid] = cast("str | None", r["parent_checkpoint_id"])
-            for i in range(len(channels)):
-                ver_by_i_by_cid[i][cid] = cast("str | None", r.get(f"ver_{i}"))
-                hb_by_i_by_cid[i][cid] = bool(r.get(f"hb_{i}"))
-                inline_by_i_by_cid[i][cid] = r.get(f"inline_{i}")
-            # Rows are DESC; the last one is the smallest cid in the page.
-            oldest = cid
-        return oldest
-
-    @staticmethod
-    def _try_advance_walks(
-        target_id: str,
-        channels: Sequence[str],
-        parent_of: Mapping[str, str | None],
-        ver_by_i_by_cid: Sequence[Mapping[str, str | None]],
-        hb_by_i_by_cid: Sequence[Mapping[str, bool]],
-        inline_by_i_by_cid: Sequence[Mapping[str, Any]],
-        chain_by_ch: dict[str, list[str]],
-        seed_ver_by_ch: dict[str, str | None],
-        seed_inline_by_ch: dict[str, Any],
-        walk_cursor_by_ch: dict[str, str | None],
-        seeded: set[str],
-    ) -> None:
-        """Advance each not-yet-seeded channel's walk as far as possible.
-
-        Uses the partial `parent_of` map accumulated so far. A walk stops
-        either because:
-          (a) it found a stored value for its channel — a blob or an inline
-              primitive (channel becomes seeded),
-          (b) it reached a real root (parent_of[cid] is None — fully
-              materialized at this point), or
-          (c) the next ancestor cid isn't in `parent_of` yet (waiting for
-              a later page; the cursor stays put).
-
-        Mutates `chain_by_ch`, `seed_ver_by_ch`, `seed_inline_by_ch`,
-        `walk_cursor_by_ch`, and `seeded` in place.
-        """
-        for i, ch in enumerate(channels):
-            if ch in seeded:
-                continue
-            # First-time entry: cursor starts at the target's parent.
-            if ch not in walk_cursor_by_ch:
-                walk_cursor_by_ch[ch] = parent_of.get(target_id)
-            cur_cid = walk_cursor_by_ch[ch]
-            ch_chain = chain_by_ch[ch]
-            hb_i = hb_by_i_by_cid[i]
-            inline_i = inline_by_i_by_cid[i]
-            ver_i = ver_by_i_by_cid[i]
-            while cur_cid is not None:
-                if cur_cid not in parent_of:
-                    # Need more pages to continue this walk.
-                    break
-                ch_chain.append(cur_cid)
-                has_blob = hb_i.get(cur_cid, False)
-                inline = inline_i.get(cur_cid)
-                if has_blob or inline is not None:
-                    # A blob wins: for a `_DeltaSnapshot` the inline reading is
-                    # the `true` marker, not the value.
-                    seed_ver_by_ch[ch] = ver_i.get(cur_cid)
-                    if not has_blob:
-                        seed_inline_by_ch[ch] = inline
-                    seeded.add(ch)
-                    cur_cid = None
-                    break
-                cur_cid = parent_of[cur_cid]
-            walk_cursor_by_ch[ch] = cur_cid
-
-    def _build_delta_channels_writes_history(
-        self,
-        *,
-        channels: Sequence[str],
-        chain_by_ch: Mapping[str, list[str]],
-        seed_ver_by_ch: Mapping[str, str | None],
-        seed_inline_by_ch: Mapping[str, Any],
-        stage2_rows: Sequence[_DeltaStage2Row],
-    ) -> dict[str, DeltaChannelHistory]:
-        """Demux stage 2 rows per channel; produce per-channel histories.
-
-        stage2_rows carry `channel` on every row. We build per-channel
-        `writes_by_cid` and per-channel `seed_blob` dicts, then assemble
-        a `DeltaChannelHistory` per requested channel.
-
-        A seed comes from the blobs table when the walk found one there, and
-        otherwise from `seed_inline_by_ch` — `put` keeps `None`, `str`, `int`,
-        `float` and `bool` values in the checkpoint's own `channel_values` with
-        no blob row, so those never appear in `stage2_rows`.
-
-        The `seed` key is omitted when the walk reached root without finding a
-        stored value, or when the seed blob is sentinel "empty" — in both cases
-        the consumer treats absence as "start empty".
-        """
-        # writes_by_ch_by_cid[channel][cid] = list of (type, blob, task_id, idx)
-        writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
-            ch: {} for ch in channels
-        }
-        # seed_blob_by_ver[(channel, version)] = (type, blob)
-        seed_blob_by_ver: dict[tuple[str, str], tuple[str, bytes]] = {}
-
-        for r in stage2_rows:
-            ch = cast(str, r["channel"])
-            kind = r["_kind"]
-            if kind == "w":
-                cid = cast(str, r["checkpoint_id"])
-                writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
-                    cast(
-                        "tuple[str, bytes, str, int]",
-                        (r["type"], r["blob"], r["task_id"], r["idx"]),
-                    )
-                )
-            else:  # kind == "b"
-                ver = cast(str, r["version"])
-                seed_blob_by_ver[(ch, ver)] = cast(
-                    "tuple[str, bytes]", (r["type"], r["blob"])
-                )
-
-        # Sort writes per (channel, cid) newest-first by (task_id, idx)
-        for cid_map in writes_by_ch_by_cid.values():
-            for ws in cid_map.values():
-                ws.sort(key=lambda w: (w[2], w[3]), reverse=True)
-
-        result: dict[str, DeltaChannelHistory] = {}
-        for ch in channels:
-            chain_cids = chain_by_ch.get(ch, [])
-            seed_version = seed_ver_by_ch.get(ch)
-
-            collected: list[PendingWrite] = []
-            cid_writes = writes_by_ch_by_cid.get(ch, {})
-            for cid in chain_cids:
-                for type_tag, write_blob, task_id, _idx in cid_writes.get(cid, []):
-                    val = self.serde.loads_typed((type_tag, write_blob))
-                    collected.append((task_id, ch, val))
-            collected.reverse()
-
-            entry: DeltaChannelHistory = {"writes": collected}
-            if seed_version is not None:
-                blob = seed_blob_by_ver.get((ch, seed_version))
-                if blob is not None and blob[0] != "empty":
-                    entry["seed"] = self.serde.loads_typed(blob)
-                elif ch in seed_inline_by_ch:
-                    # Inline primitive: stored in the checkpoint, not the blobs
-                    # table, so stage 2 never returned a row for it.
-                    entry["seed"] = seed_inline_by_ch[ch]
-            result[ch] = entry
-        return result
-
    def _dump_blobs(
        self,
        thread_id: str,
@@ -334,7 +334,7 @@ class ShallowPostgresSaver(BasePostgresSaver):
            >>> checkpoint_tuple = memory.get_tuple(config)
            >>> print(checkpoint_tuple)
            CheckpointTuple(...)
-        """
+        """  # noqa
        thread_id = config["configurable"]["thread_id"]
        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
        args = (thread_id, checkpoint_ns)
@@ -885,7 +885,7 @@ class AsyncShallowPostgresSaver(BasePostgresSaver):
        while True:
            try:
                yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]
+                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
                    self.loop,
                ).result()
            except StopAsyncIteration:
@@ -4,7 +4,6 @@ import asyncio
 import concurrent.futures
 import json
 import logging
-import re
 import threading
 from collections import defaultdict
 from collections.abc import Callable, Iterable, Iterator, Sequence
@@ -239,12 +238,6 @@ class BasePostgresStore(Generic[C]):
    conn: C
    _deserializer: Callable[[bytes | orjson.Fragment], dict[str, Any]] | None
    index_config: PostgresIndexConfig | None
-    ttl_config: TTLConfig | None
-
-    @property
-    def _omit_expired(self) -> bool:
-        """Whether expired-but-unswept rows should be filtered from reads."""
-        return bool(self.ttl_config and self.ttl_config.get("omit_expired"))

    def _get_batch_GET_ops_queries(
        self,
@@ -265,17 +258,12 @@ class BasePostgresStore(Generic[C]):
            namespace_groups[op.namespace].append((idx, op.key))
            refresh_ttls[op.namespace].append(op.refresh_ttl)

-        omit_expired = self._omit_expired
-        expiry_clause = (
-            "AND (s.expires_at IS NULL OR s.expires_at > NOW())" if omit_expired else ""
-        )
-
        results = []
        for namespace, items in namespace_groups.items():
            _, keys = zip(*items, strict=False)
            this_refresh_ttls = refresh_ttls[namespace]

-            query = f"""
+            query = """
                WITH passed_in AS (
                    SELECT unnest(%s::text[]) AS key,
                        unnest(%s::bool[])  AS do_refresh
@@ -288,14 +276,12 @@ class BasePostgresStore(Generic[C]):
                    AND s.key    = p.key
                    AND p.do_refresh = TRUE
                    AND s.ttl_minutes IS NOT NULL
-                    {expiry_clause}
                    RETURNING s.key
                )
                SELECT s.key, s.value, s.created_at, s.updated_at
                FROM store s
                JOIN passed_in p ON s.key = p.key
                WHERE s.prefix = %s
-                {expiry_clause}
            """
            ns_text = _namespace_to_text(namespace)
            params = (
@@ -436,13 +422,6 @@ class BasePostgresStore(Generic[C]):
        - embedding_requests: list of (original_index_in_search_ops, text_query)
        """

-        omit_expired = self._omit_expired
-        search_expiry_clause = (
-            "AND (store.expires_at IS NULL OR store.expires_at > NOW())"
-            if omit_expired
-            else ""
-        )
-
        queries = []
        embedding_requests = []
        for idx, (_, op) in enumerate(search_ops):
@@ -464,9 +443,8 @@ class BasePostgresStore(Generic[C]):
            ns_condition = "TRUE"
            ns_param: Sequence[str] | None = None
            if op.namespace_prefix:
-                ns_condition, ns_param = _namespace_prefix_condition(
-                    op.namespace_prefix
-                )
+                ns_condition = "store.prefix LIKE %s"
+                ns_param = (f"{_namespace_to_text(op.namespace_prefix)}%",)
            else:
                ns_param = ()

@@ -513,7 +491,7 @@ class BasePostgresStore(Generic[C]):
                            {score_operator} AS neg_score
                        FROM store
                        JOIN store_vectors sv ON store.prefix = sv.prefix AND store.key = sv.key
-                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
+                        WHERE {ns_condition} {extra_filters}
                        ORDER BY {score_operator} ASC
                        LIMIT %s
                    """
@@ -549,7 +527,7 @@ class BasePostgresStore(Generic[C]):
                base_query = f"""
                        SELECT store.prefix, store.key, store.value, store.created_at, store.updated_at, NULL AS score
                        FROM store
-                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
+                        WHERE {ns_condition} {extra_filters}
                        ORDER BY store.updated_at DESC
                        LIMIT %s
                        OFFSET %s
@@ -613,23 +591,18 @@ class BasePostgresStore(Generic[C]):
            """
            params: list[Any] = [op.max_depth, op.max_depth]

-            omit_expired = self._omit_expired
            conditions = []
-            if omit_expired:
-                conditions.append("(expires_at IS NULL OR expires_at > NOW())")
            if op.match_conditions:
                for condition in op.match_conditions:
-                    if condition.match_type in ("prefix", "suffix"):
-                        if not condition.path:
-                            # An empty path constrains nothing; skipping keeps it a
-                            # no-op rather than emitting a pattern that matches no
-                            # namespace at all.
-                            continue
-                        conditions.append("prefix ~ %s")
+                    if condition.match_type == "prefix":
+                        conditions.append("prefix LIKE %s")
                        params.append(
-                            _namespace_match_pattern(
-                                condition.path, condition.match_type
-                            )
+                            f"{_namespace_to_text(condition.path, handle_wildcards=True)}%"
+                        )
+                    elif condition.match_type == "suffix":
+                        conditions.append("prefix LIKE %s")
+                        params.append(
+                            f"%{_namespace_to_text(condition.path, handle_wildcards=True)}"
                        )
                    else:
                        logger.warning(
@@ -1275,59 +1248,15 @@ def _get_index_params(store: Any) -> tuple[str, dict[str, Any]]:
    return kind, sanitized


-def _namespace_to_text(namespace: tuple[str, ...]) -> str:
+def _namespace_to_text(
+    namespace: tuple[str, ...], handle_wildcards: bool = False
+) -> str:
    """Convert namespace tuple to text string."""
+    if handle_wildcards:
+        namespace = tuple("%" if val == "*" else val for val in namespace)
    return ".".join(namespace)


-def _escape_like_literal(text: str) -> str:
-    """Escape LIKE metacharacters so `text` is matched literally.
-
-    Namespace labels may contain `_` and `%`, which would otherwise act as
-    wildcards: `("user_1",)` would match `("userX1",)`. Backslash is escaped
-    first so it cannot escape the following character. Requires an explicit
-    `ESCAPE '\\'` clause on the pattern.
-    """
-    return text.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
-
-
-def _namespace_prefix_condition(namespace_prefix: tuple[str, ...]) -> tuple[str, tuple]:
-    """Build the SQL scoping a search to a namespace and its descendants.
-
-    Matches the namespace exactly or requires the `.` separator before any
-    remainder, so a prefix of `("foo",)` does not also match `("foobar",)`.
-
-    Both arms stay index-friendly: equality on the `(prefix, key)` primary key,
-    the anchored LIKE on the `prefix text_pattern_ops` index.
-
-    Only the LIKE arm is escaped -- equality does not interpret metacharacters,
-    so escaping it would stop `("user_1",)` from matching itself.
-    """
-    path = _namespace_to_text(namespace_prefix)
-    condition = r"(store.prefix = %s OR store.prefix LIKE %s ESCAPE '\')"
-    return condition, (path, f"{_escape_like_literal(path)}.%")
-
-
-def _namespace_match_pattern(path: tuple[str, ...], match_type: str) -> str:
-    """Build a POSIX regex matching the dot-joined prefix on whole segments.
-
-    Needed because `LIKE` cannot express "any character except the separator".
-    Matches how `InMemoryStore` compares namespaces element-wise.
-
-    `*` matches exactly one segment. Prefix matches stay open-ended but must end
-    on a separator; suffix matches anchor at the end and begin on one.
-
-    Examples:
-        prefix ("uid", "*", "alice") -> ^uid\\.[^.]+\\.alice(\\.|\\Z)
-        suffix ("alice",)            -> (^|\\.)alice\\Z
-    """
-    segments = ("[^.]+" if part == "*" else re.escape(part) for part in path)
-    body = r"\.".join(segments)
-    if match_type == "suffix":
-        return rf"(^|\.){body}\Z"
-    return rf"^{body}(\.|\Z)"
-
-
 def _row_to_item(
    namespace: tuple[str, ...],
    row: Row,
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.0.5"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=4.1.0,<5.0.0",
+  "langgraph-checkpoint>=2.1.2,<5.0.0",
  "orjson>=3.11.5",
  "psycopg>=3.2.0",
  "psycopg-pool>=3.2.0",
@@ -20,7 +20,7 @@ dependencies = [

 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-postgres"
-Twitter = "https://x.com/langchain_oss"
+Twitter = "https://x.com/LangChain"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"

@@ -32,13 +32,12 @@ test = [
  "pytest-mock",
  "psycopg[binary]",
  "langgraph-checkpoint",
-  "langgraph-checkpoint-conformance",
  "pytest-watcher",
 ]
 lint = [
  "ruff",
  "codespell",
-  "ty",
+  "mypy",
 ]
 dev = [
  {include-group = "test"},
@@ -50,7 +49,6 @@ default-groups = ['dev']

 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
-langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }

 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -66,22 +64,20 @@ lint.select = [
  "UP", # pyupgrade
  "B",  # flake8-bugbear
  "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
  "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
 target-version = "py310"

-[tool.ty.rules]
-invalid-argument-type = "ignore"
-invalid-assignment = "ignore"
-invalid-key = "ignore"
-invalid-return-type = "ignore"
-invalid-typed-dict-field = "ignore"
-invalid-yield = "ignore"
-no-matching-overload = "ignore"
-unused-type-ignore-comment = "ignore"
+[tool.mypy]
+# https://mypy.readthedocs.io/en/stable/config_file.html
+disallow_untyped_defs = "True"
+explicit_package_bases = "True"
+warn_no_return = "False"
+warn_unused_ignores = "True"
+warn_redundant_casts = "True"
+allow_redefinition = "True"
+disable_error_code = "typeddict-item, return-value"

 [tool.pytest-watcher]
 now = true
@@ -361,9 +361,9 @@ async def test_get_checkpoint_no_channel_values(

        load_checkpoint_tuple = saver._load_checkpoint_tuple

-        async def patched_load_checkpoint_tuple(value):
+        def patched_load_checkpoint_tuple(value):
            value["checkpoint"].pop("channel_values", None)
-            return await load_checkpoint_tuple(value)
+            return load_checkpoint_tuple(value)

        monkeypatch.setattr(
            saver, "_load_checkpoint_tuple", patched_load_checkpoint_tuple
@@ -371,49 +371,3 @@ 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"
-    )
-
-    # Deferred on purpose: langgraph core is not a test dependency of this
-    # package, so these must stay behind the importorskip above.
-    from typing import Annotated  # noqa: PLC0415
-
-    from langchain_core.messages import AIMessage, HumanMessage  # noqa: PLC0415
-    from langgraph.channels.delta import DeltaChannel  # noqa: PLC0415
-    from langgraph.graph import START, StateGraph  # noqa: PLC0415
-    from langgraph.graph.message import _messages_delta_reducer  # noqa: PLC0415
-    from typing_extensions import TypedDict  # noqa: PLC0415
-
-    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"
@@ -739,135 +739,3 @@ async def test_store_ttl(store):
    # Now has been (TTL_SECONDS-2)*2 > TTL_SECONDS + TTL_SECONDS/2
    results = await store.asearch(ns, query="bar", refresh_ttl=False)
    assert len(results) == 0
-
-
-async def _aexpire_now(
-    store: AsyncPostgresStore, ns: tuple[str, ...], key: str
-) -> None:
-    """Backdate a row's expires_at into the past without deleting it (unswept)."""
-    async with store._cursor() as cur:
-        await cur.execute(
-            "UPDATE store SET expires_at = NOW() - INTERVAL '1 minute' "
-            "WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-
-
-async def _arow_exists(
-    store: AsyncPostgresStore, ns: tuple[str, ...], key: str
-) -> bool:
-    async with store._cursor() as cur:
-        await cur.execute(
-            "SELECT COUNT(*) AS n FROM store WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-        return (await cur.fetchone())["n"] == 1
-
-
-async def _astored_expires_at(store: AsyncPostgresStore, ns: tuple[str, ...], key: str):
-    async with store._cursor() as cur:
-        await cur.execute(
-            "SELECT expires_at FROM store WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-        return (await cur.fetchone())["expires_at"]
-
-
-async def test_omit_expired_filters_read_paths(store: AsyncPostgresStore) -> None:
-    await store.stop_ttl_sweeper()  # deterministic: no background deletion
-    store.ttl_config["omit_expired"] = True
-
-    expired_ns = ("omit", "expired")
-    control_ns = ("omit", "control")
-    await store.aput(expired_ns, "e", {"data": "gone"}, ttl=TTL_MINUTES)
-    await store.aput(control_ns, "c", {"data": "keep"}, ttl=None)
-    await _aexpire_now(store, expired_ns, "e")
-
-    # The row is expired but physically still present (unswept).
-    assert await _arow_exists(store, expired_ns, "e")
-
-    # aget omits it; the never-expiring control is still returned.
-    assert await store.aget(expired_ns, "e") is None
-    assert await store.aget(control_ns, "c") is not None
-
-    # asearch omits it but returns the control.
-    assert await store.asearch(expired_ns) == []
-    assert [i.key for i in await store.asearch(control_ns)] == ["c"]
-
-    # alist_namespaces drops the expired-only namespace, keeps the control.
-    namespaces = await store.alist_namespaces(prefix=("omit",))
-    assert expired_ns not in namespaces
-    assert control_ns in namespaces
-
-
-@pytest.mark.parametrize("omit", [None, False], ids=["default", "explicit-false"])
-async def test_omit_expired_disabled_preserves_expired_rows(
-    store: AsyncPostgresStore, omit
-) -> None:
-    await store.stop_ttl_sweeper()
-    if omit is not None:
-        store.ttl_config["omit_expired"] = omit
-
-    ns = ("keep",)
-    await store.aput(ns, "k", {"data": "still-here"}, ttl=TTL_MINUTES)
-    await _aexpire_now(store, ns, "k")
-
-    assert await store.aget(ns, "k", refresh_ttl=False) is not None
-    assert [i.key for i in await store.asearch(ns, refresh_ttl=False)] == ["k"]
-    assert ns in await store.alist_namespaces(prefix=("keep",))
-
-
-async def test_omit_expired_refresh_ttl_only_refreshes_live_rows(
-    store: AsyncPostgresStore,
-) -> None:
-    await store.stop_ttl_sweeper()
-    store.ttl_config["omit_expired"] = True
-
-    ns = ("refresh",)
-    await store.aput(ns, "expired", {"n": 0}, ttl=TTL_MINUTES)
-    await store.aput(ns, "live_get", {"n": 1}, ttl=TTL_MINUTES)
-    await store.aput(ns, "live_search", {"n": 2}, ttl=TTL_MINUTES)
-    await _aexpire_now(store, ns, "expired")
-
-    expired_before = await _astored_expires_at(store, ns, "expired")
-    get_before = await _astored_expires_at(store, ns, "live_get")
-    search_before = await _astored_expires_at(store, ns, "live_search")
-
-    # refresh_ttl=True must NOT resurrect the expired row (via aget or asearch)...
-    assert await store.aget(ns, "expired", refresh_ttl=True) is None
-    live_keys = [i.key for i in await store.asearch(ns, refresh_ttl=True)]
-    assert "expired" not in live_keys
-    assert await _astored_expires_at(store, ns, "expired") == expired_before
-
-    # ...but must still extend the live rows that were read.
-    assert await store.aget(ns, "live_get", refresh_ttl=True) is not None
-    assert await _astored_expires_at(store, ns, "live_get") > get_before
-    assert await _astored_expires_at(store, ns, "live_search") > search_before
-
-
-async def test_omit_expired_search_pagination(store: AsyncPostgresStore) -> None:
-    await store.stop_ttl_sweeper()
-    store.ttl_config["omit_expired"] = True
-
-    ns = ("page",)
-    for k in ("a", "b", "c"):
-        await store.aput(ns, k, {"k": k}, ttl=TTL_MINUTES)
-    await store.aput(ns, "expired", {"k": "x"}, ttl=TTL_MINUTES)
-    await _aexpire_now(store, ns, "expired")
-
-    seconds_ago = {"a": 1, "expired": 2, "b": 3, "c": 4}
-    # updated_at DESC orders these a, expired, b, c, so the expired row sits inside
-    # the first limit=2 window. Correct (pre-LIMIT) filtering yields live pages
-    # [a, b] then [c]; post-LIMIT filtering would underfill page 1 to just [a].
-    async with store._cursor() as cur:
-        for key, secs in seconds_ago.items():
-            await cur.execute(
-                "UPDATE store SET updated_at = NOW() - (%s * INTERVAL '1 second') "
-                "WHERE prefix = %s AND key = %s",
-                (secs, ".".join(ns), key),
-            )
-
-    page1 = await store.asearch(ns, limit=2, offset=0)
-    page2 = await store.asearch(ns, limit=2, offset=2)
-    assert [i.key for i in page1] == ["a", "b"]
-    assert [i.key for i in page2] == ["c"]
@@ -1,30 +0,0 @@
-"""Run delta-channel conformance capabilities against AsyncPostgresSaver."""
-
-from __future__ import annotations
-
-import pytest
-from langgraph.checkpoint.conformance import validate
-from langgraph.checkpoint.conformance.initializer import checkpointer_test
-
-from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
-from tests.conftest import DEFAULT_URI
-
-
-@pytest.mark.asyncio
-async def test_delta_channel_conformance():
-    @checkpointer_test(name="AsyncPostgresSaver")
-    async def postgres_saver():
-        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-            await saver.setup()
-            yield saver
-
-    report = await validate(
-        postgres_saver,
-        capabilities={
-            "delta_channel_history",
-        },
-    )
-    for cap, result in report.results.items():
-        if result.passed is False:
-            details = "\n".join(result.failures or [])
-            pytest.fail(f"Capability {cap} failed:\n{details}")
@@ -1,204 +0,0 @@
-"""Seed detection for `DeltaChannel` histories on Postgres.
-
-`put` splits stored values in two: primitives stay inline in the checkpoint's
-`channel_values`, everything else moves to `checkpoint_blobs`. Only
-`_DeltaSnapshot` leaves an inline marker behind when it moves, so the stage-1
-walk has to check both places — a blob probe alone misses inline primitives, and
-an inline-key check alone missed blob-stored plain values, which is what a thread
-migrated from a pre-delta channel type leaves behind. See #8534.
-"""
-
-from __future__ import annotations
-
-from typing import Any
-from uuid import uuid4
-
-import pytest
-from langgraph.checkpoint.base import Checkpoint, empty_checkpoint
-from langgraph.checkpoint.base.id import uuid6
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
-from tests.conftest import DEFAULT_URI
-
-CHANNEL = "items"
-
-
-async def _build_chain(saver: AsyncPostgresSaver, seed_value: Any) -> tuple[str, dict]:
-    """Store `seed_value` at step 1, then two steps that store nothing.
-
-    Every step carries a write so the walk has something to collect.
-    Returns `(thread_id, head_config)`.
-    """
-    thread_id = str(uuid4())
-    parent: dict | None = None
-    for step in range(4):
-        config: dict = {"configurable": {"thread_id": thread_id, "checkpoint_ns": ""}}
-        if parent is not None:
-            config["configurable"]["checkpoint_id"] = parent["configurable"][
-                "checkpoint_id"
-            ]
-        cp: Checkpoint = empty_checkpoint()
-        cp["id"] = str(uuid6(clock_seq=step))
-        new_versions: dict[str, Any] = {}
-        if step == 1:
-            cp["channel_values"][CHANNEL] = seed_value
-            cp["channel_versions"][CHANNEL] = "v1"
-            new_versions[CHANNEL] = "v1"
-        else:
-            cp["channel_versions"][CHANNEL] = f"v{step}"
-        parent = await saver.aput(
-            config, cp, {"source": "loop", "step": step, "parents": {}}, new_versions
-        )
-        await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
-    assert parent is not None
-    return thread_id, parent
-
-
-@pytest.mark.asyncio
-async def test_plain_value_seed_is_found() -> None:
-    """A pre-delta plain value must be located as the seed.
-
-    Before #8534 the walk ran to the root and returned no seed, which happens
-    to reconstruct correctly for additive reducers while costing an
-    O(thread length) replay on every read.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        _, head = await _build_chain(saver, [10, 20])
-
-        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        entry = result[CHANNEL]
-
-        assert entry.get("seed") == [10, 20], (
-            f"expected the plain value as seed, got {entry.get('seed', '<missing>')}"
-        )
-        # Only the writes between the seed and the head's parent replay: step 1
-        # (the seed's own) and step 2. Step 0 is older than the seed, step 3 is
-        # pending at the head.
-        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_delta_snapshot_seed_is_found() -> None:
-    """The `_DeltaSnapshot` path keeps working, so both seed kinds agree."""
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        _, head = await _build_chain(saver, _DeltaSnapshot([10, 20]))
-
-        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        entry = result[CHANNEL]
-
-        seed = entry.get("seed")
-        assert isinstance(seed, _DeltaSnapshot), f"expected a snapshot, got {seed!r}"
-        assert seed.value == [10, 20]
-        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_version_bump_without_a_value_does_not_hide_an_older_seed() -> None:
-    """A delta-era step bumps `channel_versions` without storing a value, so no
-    blob exists for that version. The probe must report no seed there and keep
-    walking rather than stopping at a version it cannot resolve.
-
-    Step 0 holds the real value; step 1 bumps the version with nothing stored.
-    Walking back from the head has to pass step 1 to reach step 0.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        thread_id = str(uuid4())
-        parent: dict | None = None
-        for step in range(4):
-            config: dict = {
-                "configurable": {"thread_id": thread_id, "checkpoint_ns": ""}
-            }
-            if parent is not None:
-                config["configurable"]["checkpoint_id"] = parent["configurable"][
-                    "checkpoint_id"
-                ]
-            cp: Checkpoint = empty_checkpoint()
-            cp["id"] = str(uuid6(clock_seq=step))
-            new_versions: dict[str, Any] = {}
-            if step == 0:
-                cp["channel_values"][CHANNEL] = [10, 20]
-                cp["channel_versions"][CHANNEL] = "v0"
-                new_versions[CHANNEL] = "v0"
-            elif step == 1:
-                # Version bumped, value absent -> no blob row written.
-                cp["channel_versions"][CHANNEL] = "v1"
-                new_versions[CHANNEL] = "v1"
-            else:
-                cp["channel_versions"][CHANNEL] = "v1"
-            parent = await saver.aput(
-                config,
-                cp,
-                {"source": "loop", "step": step, "parents": {}},
-                new_versions,
-            )
-            await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
-        assert parent is not None
-
-        result = await saver.aget_delta_channel_history(
-            config=parent, channels=[CHANNEL]
-        )
-        entry = result[CHANNEL]
-
-        assert entry.get("seed") == [10, 20], (
-            "the walk stopped at the empty blob instead of reaching the real "
-            f"value at step 0; got {entry.get('seed', '<missing>')}"
-        )
-        assert [w[2] for w in entry["writes"]] == ["w0", "w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_inline_primitive_seed_is_found() -> None:
-    """`put` keeps `None`, `str`, `int`, `float` and `bool` in the checkpoint's
-    own `channel_values` with no blob row, so a blob probe alone cannot see
-    them. Stage 1 reads the inline value too and uses it when there is no blob.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        for seed_value in (42, "x", 3.5, None):
-            _, head = await _build_chain(saver, seed_value)
-            entry = (
-                await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-            )[CHANNEL]
-            if seed_value is None:
-                # A JSON null is indistinguishable from "no value stored", so
-                # the walk keeps going; replay from empty is the correct result.
-                assert "seed" not in entry
-            else:
-                assert entry.get("seed") == seed_value, (
-                    f"inline {type(seed_value).__name__} seed not found: "
-                    f"{entry.get('seed', '<missing>')!r}"
-                )
-                assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_inline_true_is_not_read_as_a_snapshot_marker() -> None:
-    """`put` inlines a literal `true` in `channel_values` as the marker for a
-    `_DeltaSnapshot`, which is also what a genuine `bool` channel holding
-    `True` looks like. A blob exists only in the snapshot case, so preferring
-    the blob keeps the two apart.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-
-        _, head = await _build_chain(saver, True)
-        entry = (
-            await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        )[CHANNEL]
-        assert entry.get("seed") is True, (
-            f"a real inline True must survive, got {entry.get('seed', '<missing>')!r}"
-        )
-
-        _, snap_head = await _build_chain(saver, _DeltaSnapshot(True))
-        snap_entry = (
-            await saver.aget_delta_channel_history(config=snap_head, channels=[CHANNEL])
-        )[CHANNEL]
-        seed = snap_entry.get("seed")
-        assert isinstance(seed, _DeltaSnapshot), (
-            f"the marker must resolve to the blob, not inline true; got {seed!r}"
-        )
-        assert seed.value is True
@@ -20,10 +20,6 @@ from langgraph.store.base import (
 from psycopg import Connection

 from langgraph.store.postgres import PostgresStore
-from langgraph.store.postgres.base import (
-    _escape_like_literal,
-    _namespace_match_pattern,
-)
 from tests.conftest import (
    DEFAULT_URI,
    VECTOR_TYPES,
@@ -330,127 +326,6 @@ def test_list_namespaces(store) -> None:
        store.delete(namespace, "dummy")


-def test_escape_like_literal() -> None:
-    assert _escape_like_literal("users.alice") == "users.alice"
-    assert _escape_like_literal("user_1") == r"user\_1"
-    assert _escape_like_literal("100%") == r"100\%"
-    assert _escape_like_literal("a\\b") == "a\\\\b"
-    assert _escape_like_literal("") == ""
-
-
-def test_namespace_match_pattern() -> None:
-    assert _namespace_match_pattern(("foo",), "prefix") == r"^foo(\.|\Z)"
-    assert _namespace_match_pattern(("uid", "users"), "prefix") == r"^uid\.users(\.|\Z)"
-    assert (
-        _namespace_match_pattern(("uid", "*", "alice"), "prefix")
-        == r"^uid\.[^.]+\.alice(\.|\Z)"
-    )
-    assert _namespace_match_pattern(("alice",), "suffix") == r"(^|\.)alice\Z"
-
-    # Regex metacharacters in a label are quoted, not interpreted.
-    pattern = _namespace_match_pattern(("a.b+c",), "prefix")
-    assert re.match(pattern, "a.b+c.child")
-    assert not re.match(pattern, "axbbbc")
-
-
-def test_search_namespace_segment_boundary(store) -> None:
-    """Prefix scoping must stop at namespace segment boundaries.
-
-    Namespaces are stored dot-joined, so matching the raw text also returns
-    siblings sharing leading characters. Callers isolate tenants by namespace,
-    so prefix-shaped ids (1 vs 12) would cross-read.
-    """
-    for namespace in [
-        ("foo",),
-        ("foo", "child"),
-        ("foo", "child", "deep"),
-        ("foobar",),
-        ("foobar", "baz"),
-        ("foo2",),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
-        return {item.namespace for item in store.search(prefix, limit=100)}
-
-    assert _namespaces(("foo",)) == {
-        ("foo",),
-        ("foo", "child"),
-        ("foo", "child", "deep"),
-    }
-    # The sibling scope is independent, not merely narrower.
-    assert _namespaces(("foobar",)) == {("foobar",), ("foobar", "baz")}
-    assert _namespaces(("foo", "child")) == {("foo", "child"), ("foo", "child", "deep")}
-    assert _namespaces(("foo2",)) == {("foo2",)}
-    assert _namespaces(("fo",)) == set()
-
-
-def test_search_empty_prefix_is_unconstrained(store) -> None:
-    """An empty prefix constrains nothing and must return every namespace."""
-    for namespace in [("a",), ("b", "c"), ("d", "e", "f")]:
-        store.put(namespace, "k", {"v": 1})
-
-    assert {item.namespace for item in store.search((), limit=100)} == {
-        ("a",),
-        ("b", "c"),
-        ("d", "e", "f"),
-    }
-
-
-def test_search_namespace_like_metacharacters(store) -> None:
-    """`_` and `%` are legal namespace labels, not LIKE wildcards."""
-    for namespace in [
-        ("user_1",),
-        ("user_1", "child"),
-        ("userX1",),
-        ("a%b",),
-        ("axxb",),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
-        return {item.namespace for item in store.search(prefix, limit=100)}
-
-    # Also asserts the namespace still matches itself, which catches escaping
-    # the equality arm by mistake.
-    assert _namespaces(("user_1",)) == {("user_1",), ("user_1", "child")}
-    assert _namespaces(("a%b",)) == {("a%b",)}
-
-
-def test_list_namespaces_segment_boundary(store) -> None:
-    for namespace in [
-        ("foo",),
-        ("foo", "child"),
-        ("foobar",),
-        ("foobar", "baz"),
-        ("uid", "users", "alice"),
-        ("uid", "users", "malice"),
-        ("uid", "a", "b", "alice"),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    assert set(store.list_namespaces(prefix=["foo"], limit=100)) == {
-        ("foo",),
-        ("foo", "child"),
-    }
-    # Suffix must align to a segment: "malice" does not end with the "alice"
-    # segment.
-    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
-        ("uid", "users", "alice"),
-        ("uid", "a", "b", "alice"),
-    }
-    # "*" spans exactly one segment.
-    assert set(store.list_namespaces(prefix=["uid", "*", "alice"], limit=100)) == {
-        ("uid", "users", "alice"),
-    }
-    # Prefix matching stays open-ended across depth.
-    assert set(store.list_namespaces(prefix=["uid"], limit=100)) == {
-        ("uid", "users", "alice"),
-        ("uid", "users", "malice"),
-        ("uid", "a", "b", "alice"),
-    }
-
-
 def test_search(store) -> None:
    # Create test data
    test_data = [
@@ -988,133 +863,6 @@ def test_store_ttl(store):
    assert len(res) == 0


-def _expire_now(store: PostgresStore, ns: tuple[str, ...], key: str) -> None:
-    """Backdate a row's expires_at into the past without deleting it (unswept)."""
-    with store._cursor() as cur:
-        cur.execute(
-            "UPDATE store SET expires_at = NOW() - INTERVAL '1 minute' "
-            "WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-
-
-def _row_exists(store: PostgresStore, ns: tuple[str, ...], key: str) -> bool:
-    with store._cursor() as cur:
-        cur.execute(
-            "SELECT COUNT(*) AS n FROM store WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-        return cur.fetchone()["n"] == 1
-
-
-def _stored_expires_at(store: PostgresStore, ns: tuple[str, ...], key: str):
-    with store._cursor() as cur:
-        cur.execute(
-            "SELECT expires_at FROM store WHERE prefix = %s AND key = %s",
-            (".".join(ns), key),
-        )
-        return cur.fetchone()["expires_at"]
-
-
-def test_omit_expired_filters_read_paths(store: PostgresStore) -> None:
-    store.stop_ttl_sweeper()  # deterministic: no background deletion
-    store.ttl_config["omit_expired"] = True
-
-    expired_ns = ("omit", "expired")
-    control_ns = ("omit", "control")
-    store.put(expired_ns, "e", {"data": "gone"}, ttl=TTL_MINUTES)
-    store.put(control_ns, "c", {"data": "keep"}, ttl=None)
-    _expire_now(store, expired_ns, "e")
-
-    # The row is expired but physically still present (unswept).
-    assert _row_exists(store, expired_ns, "e")
-
-    # get omits it; the never-expiring control is still returned.
-    assert store.get(expired_ns, "e") is None
-    assert store.get(control_ns, "c") is not None
-
-    # search omits it but returns the control.
-    assert store.search(expired_ns) == []
-    assert [i.key for i in store.search(control_ns)] == ["c"]
-
-    # list_namespaces drops the expired-only namespace, keeps the control.
-    namespaces = store.list_namespaces(prefix=("omit",))
-    assert expired_ns not in namespaces
-    assert control_ns in namespaces
-
-
-@pytest.mark.parametrize("omit", [None, False], ids=["default", "explicit-false"])
-def test_omit_expired_disabled_preserves_expired_rows(
-    store: PostgresStore, omit
-) -> None:
-    store.stop_ttl_sweeper()
-    if omit is not None:
-        store.ttl_config["omit_expired"] = omit
-
-    ns = ("keep",)
-    store.put(ns, "k", {"data": "still-here"}, ttl=TTL_MINUTES)
-    _expire_now(store, ns, "k")
-
-    assert store.get(ns, "k", refresh_ttl=False) is not None
-    assert [i.key for i in store.search(ns, refresh_ttl=False)] == ["k"]
-    assert ns in store.list_namespaces(prefix=("keep",))
-
-
-def test_omit_expired_refresh_ttl_only_refreshes_live_rows(
-    store: PostgresStore,
-) -> None:
-    store.stop_ttl_sweeper()
-    store.ttl_config["omit_expired"] = True
-
-    ns = ("refresh",)
-    store.put(ns, "expired", {"n": 0}, ttl=TTL_MINUTES)
-    store.put(ns, "live_get", {"n": 1}, ttl=TTL_MINUTES)
-    store.put(ns, "live_search", {"n": 2}, ttl=TTL_MINUTES)
-    _expire_now(store, ns, "expired")
-
-    expired_before = _stored_expires_at(store, ns, "expired")
-    get_before = _stored_expires_at(store, ns, "live_get")
-    search_before = _stored_expires_at(store, ns, "live_search")
-
-    # refresh_ttl=True must NOT resurrect the expired row (via get or search)...
-    assert store.get(ns, "expired", refresh_ttl=True) is None
-    assert "expired" not in [i.key for i in store.search(ns, refresh_ttl=True)]
-    assert _stored_expires_at(store, ns, "expired") == expired_before
-
-    # ...but must still extend the live rows that were read.
-    assert store.get(ns, "live_get", refresh_ttl=True) is not None
-    assert _stored_expires_at(store, ns, "live_get") > get_before
-    assert _stored_expires_at(store, ns, "live_search") > search_before
-
-
-def test_omit_expired_search_pagination(store: PostgresStore) -> None:
-    store.stop_ttl_sweeper()
-    store.ttl_config["omit_expired"] = True
-
-    ns = ("page",)
-    for k in ("a", "b", "c"):
-        store.put(ns, k, {"k": k}, ttl=TTL_MINUTES)
-    store.put(ns, "expired", {"k": "x"}, ttl=TTL_MINUTES)
-    _expire_now(store, ns, "expired")
-
-    seconds_ago = {"a": 1, "expired": 2, "b": 3, "c": 4}
-    # updated_at DESC orders these a, expired, b, c, so the expired row sits inside
-    # the first limit=2 window. Correct (pre-LIMIT) filtering yields live pages
-    # [a, b] then [c]; post-LIMIT filtering would underfill page 1 to just [a].
-    with store._cursor() as cur:
-        for key, secs in seconds_ago.items():
-            cur.execute(
-                "UPDATE store SET updated_at = NOW() - (%s * INTERVAL '1 second') "
-                "WHERE prefix = %s AND key = %s",
-                (secs, ".".join(ns), key),
-            )
-
-    page1 = store.search(ns, limit=2, offset=0)
-    page2 = store.search(ns, limit=2, offset=2)
-    assert [i.key for i in page1] == ["a", "b"]
-    assert [i.key for i in page2] == ["c"]
-
-
@pytest.mark.parametrize(
    "vector_type,distance_type",
    [
@@ -1151,16 +899,3 @@ def test_non_ascii(
        assert result3[0].key == "3"
        assert result4[0].key == "4"
        assert result5[0].key == "5"
-
-
-def test_namespace_labels_with_trailing_newline(store) -> None:
-    """Labels may contain newlines, and must not match a differently-named label."""
-    store.put(("users", "alice"), "k", {"v": 1})
-    store.put(("users", "alice\n"), "k", {"v": 2})
-
-    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
-        ("users", "alice"),
-    }
-    assert set(store.list_namespaces(prefix=["users", "alice"], limit=100)) == {
-        ("users", "alice"),
-    }
@@ -18,19 +18,22 @@ test_watch:

 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
+MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
+lint_tests: MYPY_CACHE=.mypy_cache_test

 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)" = "" ] || uv run ty check $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 type:
-	uv run ty check $(PYTHON_FILES)
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
@@ -1,31 +1,6 @@
 # LangGraph SQLite Checkpoint

-[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-sqlite?label=%20)](https://pypi.org/project/langgraph-checkpoint-sqlite/#history)
-[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-sqlite)](https://opensource.org/licenses/MIT)
-[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-sqlite)](https://pypistats.org/packages/langgraph-checkpoint-sqlite)
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
-
-To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
-[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
-
-## Quick Install
-
-```bash
-uv add langgraph-checkpoint-sqlite
-```
-
-## 🤔 What is this?
-
-This library provides a SQLite implementation of LangGraph's checkpoint saver, with both sync and async support via `aiosqlite`. Use it when you want LangGraph state persistence backed by SQLite for local development, testing, or lightweight deployments.
-
-## 📖 Documentation
-
-For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint.sqlite). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
-
-## 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.
+Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)

 ## Usage

@@ -111,13 +86,3 @@ async with AsyncSqliteSaver.from_conn_string(":memory:") as checkpointer:
    # list checkpoints
    [c async for c in checkpointer.alist(read_config)]
 ```
-
-## 📕 Releases & Versioning
-
-See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
-
-## 💁 Contributing
-
-As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
-
-For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
@@ -4,7 +4,7 @@ import json
 import random
 import sqlite3
 import threading
-from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import closing, contextmanager
 from typing import Any, cast

@@ -16,19 +16,12 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
    SerializerProtocol,
    get_checkpoint_id,
    get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer

-from langgraph.checkpoint.sqlite._delta import (
-    DELTA_STAGE1_SQL,
-    build_delta_channels_writes_history,
-    build_delta_stage2_sql,
-    step_walk_with_row,
-)
 from langgraph.checkpoint.sqlite.utils import search_where

 _AIO_ERROR_MSG = (
@@ -77,7 +70,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
        >>> result = graph.invoke(3, config)
        >>> graph.get_state(config)
        StateSnapshot(values=4, next=(), config={'configurable': {'thread_id': '1', 'checkpoint_ns': '', 'checkpoint_id': '0c62ca34-ac19-445d-bbb0-5b4984975b2a'}}, parent_config=None)
-    """
+    """  # noqa

    conn: sqlite3.Connection
    is_setup: bool
@@ -222,7 +215,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
            >>> checkpoint_tuple = memory.get_tuple(config)
            >>> print(checkpoint_tuple)
            CheckpointTuple(...)
-        """
+        """  # noqa
        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
        with self.cursor(transaction=False) as cur:
            # find the latest checkpoint for the thread_id
@@ -500,88 +493,6 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                (str(thread_id),),
            )

-    def get_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
-
-        Two-stage query:
-
-        * Stage 1 (paged): newest-first slice of `checkpoints` returning
-          `(checkpoint_id, parent_checkpoint_id, type, checkpoint)` per
-          ancestor. Sqlite has no JSONB, so we ship the full serialized
-          checkpoint blob and inspect `channel_values` in Python. Pages
-          newest-first by `checkpoint_id` with a `< cursor` predicate;
-          page size is `DELTA_PAGE_SIZE`. Stops paging when every channel
-          has found its seed or the chain is exhausted.
-
-        * Stage 2 (per-channel UNION ALL): one branch per channel reading
-          `writes` filtered to that channel's specific `chain_cids`. No
-          separate seed-blob fetch — sqlite stores `channel_values` inline
-          in the checkpoint blob, so seeds come back from stage 1.
-        """
-        if not channels:
-            return {}
-        channels = list(channels)
-        thread_id = str(config["configurable"]["thread_id"])
-        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
-        checkpoint_id = get_checkpoint_id(config)
-        if checkpoint_id is None:
-            target = self.get_tuple(config)
-            if target is None:
-                return {ch: {"writes": []} for ch in channels}
-            checkpoint_id = target.config["configurable"]["checkpoint_id"]
-
-        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
-        seed_val_by_ch: dict[str, Any] = {}
-        walk_state: dict[str, Any] = {}
-        seeded: set[str] = set()
-
-        with self.cursor(transaction=False) as cur:
-            cur.execute(DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id))
-            for row in cur:
-                cid, parent_cid, type_tag, blob = row
-                if step_walk_with_row(
-                    cid=cid,
-                    parent_cid=parent_cid,
-                    type_tag=type_tag,
-                    blob=blob,
-                    target_id=checkpoint_id,
-                    serde=self.serde,
-                    chain_by_ch=chain_by_ch,
-                    seed_val_by_ch=seed_val_by_ch,
-                    walk_state=walk_state,
-                    seeded=seeded,
-                    channels=channels,
-                ):
-                    break
-
-            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
-            stage2_sql = build_delta_stage2_sql(
-                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
-            )
-            if stage2_sql:
-                stage2_params: list[Any] = []
-                for ch in channels_with_chain:
-                    stage2_params.extend(
-                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
-                    )
-                cur.execute(stage2_sql, stage2_params)
-                stage2_rows = cast(
-                    "list[tuple[str, str, str, int, str, bytes]]", cur.fetchall()
-                )
-            else:
-                stage2_rows = []
-
-        return build_delta_channels_writes_history(
-            channels=channels,
-            chain_by_ch=chain_by_ch,
-            seed_val_by_ch=seed_val_by_ch,
-            seeded=seeded,
-            stage2_rows=stage2_rows,
-            serde=self.serde,
-        )
-
    async def aget_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
        """Get a checkpoint tuple from the database asynchronously.

@@ -1,172 +0,0 @@
-"""Shared helpers for `get_delta_channel_history` on sqlite savers.
-
-Mirrors the two-stage shape of `BasePostgresSaver` (ancestor walk +
-per-channel UNION ALL writes fetch), but adapted for sqlite's
-constraints. The structural differences:
-
-* No JSONB — to inspect `channel_values` for a checkpoint we must
-  deserialize the full blob. Stage 1 streams the cursor row-by-row and
-  deserializes only the rows the merged walk visits, freeing each blob
-  before advancing.
-* No separate blob table — `channel_values` lives inline in the
-  checkpoint, so seeds come back from stage 1 with no second fetch.
-* Single merged walk (not K independent walks): each visited cid is
-  deserialized exactly once, regardless of how many channels are still
-  seeking their seed.
-
-The streaming design keeps peak in-flight memory at roughly one
-deserialized checkpoint at a time, instead of holding the entire
-ancestor chain's worth of raw blobs as a `fetchall()`-materialized list.
-"""
-
-from __future__ import annotations
-
-from collections.abc import Mapping, Sequence
-from typing import Any
-
-from langgraph.checkpoint.base import DeltaChannelHistory, PendingWrite
-
-# Stage 1 streams ancestors of `target_cid` newest-first. The `<=`
-# predicate keeps target itself in the stream so we can read its
-# `parent_checkpoint_id` from the first row without a separate lookup;
-# the caller skips target's own writes/seed (matches the
-# `BaseCheckpointSaver` contract).
-DELTA_STAGE1_SQL = (
-    "SELECT checkpoint_id, parent_checkpoint_id, type, checkpoint "
-    "FROM checkpoints "
-    "WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id <= ? "
-    "ORDER BY checkpoint_id DESC"
-)
-
-
-def build_delta_stage2_sql(*, chain_lens: Sequence[int]) -> str:
-    """Stage-2 per-channel UNION ALL fetching writes from `writes`.
-
-    One branch per channel with a non-empty chain. Each branch inlines its
-    own `IN (?, ?, ...)` placeholder list because sqlite has no array-bind
-    equivalent of postgres's `= ANY(%s)`. Caller passes parameters in
-    matching order: `[thread_id, checkpoint_ns, channel, *chain_cids]` per
-    branch.
-
-    Returns an empty string when no channel has a chain (caller skips
-    executing in that case). Per-channel UNION ALL avoids the over-fetch
-    of a single `channel = ANY(channels)` filter when channels have
-    different chain depths — same rationale as postgres.
-    """
-    branches: list[str] = []
-    for n in chain_lens:
-        cid_placeholders = ",".join("?" * n)
-        branches.append(
-            "SELECT checkpoint_id, channel, task_id, idx, type, value "
-            "FROM writes "
-            "WHERE thread_id = ? AND checkpoint_ns = ? AND channel = ? "
-            f"AND checkpoint_id IN ({cid_placeholders})"
-        )
-    return " UNION ALL ".join(branches)
-
-
-def step_walk_with_row(
-    *,
-    cid: str,
-    parent_cid: str | None,
-    type_tag: str,
-    blob: bytes,
-    target_id: str,
-    serde: Any,
-    chain_by_ch: dict[str, list[str]],
-    seed_val_by_ch: dict[str, Any],
-    walk_state: dict[str, Any],
-    seeded: set[str],
-    channels: Sequence[str],
-) -> bool:
-    """Process one streamed stage-1 row in the merged ancestor walk.
-
-    The cursor returns (cid, parent_cid, type, blob) rows in
-    `checkpoint_id` DESC order starting at target. The first row is
-    target itself; we read its parent_cid to seed the walk and otherwise
-    skip it (target's own writes/seed are not part of the contract).
-
-    For each subsequent row, if `cid` matches the walk's current
-    position, we deserialize the blob, append the cid to every
-    not-yet-seeded channel's chain, and check `channel_values` for
-    seeds. The deserialized checkpoint is dropped before advancing — no
-    cross-row cache, so peak in-flight is one deserialized checkpoint.
-
-    Off-path rows (different branch on the same thread) advance the
-    cursor without doing any work.
-
-    Returns True when every requested channel is seeded — the caller
-    can stop iterating and close the cursor.
-    """
-    if "started" not in walk_state:
-        if cid == target_id:
-            walk_state["started"] = True
-            walk_state["cur_cid"] = parent_cid
-            walk_state["active"] = {ch for ch in channels if ch not in seeded}
-        # Not target yet (or target not present): keep streaming.
-        return False
-    active: set[str] = walk_state["active"]
-    if not active:
-        return True
-    if cid != walk_state["cur_cid"]:
-        # Off-path row from a sibling branch — skip without deserializing.
-        return False
-    for ch in active:
-        chain_by_ch[ch].append(cid)
-    ckpt = serde.loads_typed((type_tag, blob))
-    channel_values: Mapping[str, Any] = ckpt.get("channel_values") or {}
-    for ch in [ch for ch in active if ch in channel_values]:
-        seed_val_by_ch[ch] = channel_values[ch]
-        seeded.add(ch)
-        active.discard(ch)
-    del ckpt, channel_values
-    walk_state["cur_cid"] = parent_cid
-    return not active
-
-
-def build_delta_channels_writes_history(
-    *,
-    channels: Sequence[str],
-    chain_by_ch: Mapping[str, list[str]],
-    seed_val_by_ch: Mapping[str, Any],
-    seeded: set[str],
-    stage2_rows: Sequence[tuple[str, str, str, int, str, bytes]],
-    serde: Any,
-) -> dict[str, DeltaChannelHistory]:
-    """Demux stage-2 rows per channel; produce per-channel histories.
-
-    Stage-2 rows are `(checkpoint_id, channel, task_id, idx, type, value)`.
-    Final write order is oldest→newest globally and `(task_id, idx)` within
-    a checkpoint, matching the contract on `DeltaChannelHistory.writes`.
-
-    `seed` is omitted when the walk reached a true root with no snapshot
-    found (channel never entered `seeded`); consumers treat absence as
-    "start empty".
-    """
-    writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
-        ch: {} for ch in channels
-    }
-    for cid, ch, task_id, idx, type_tag, value_blob in stage2_rows:
-        writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
-            (type_tag, value_blob, task_id, idx)
-        )
-    for cid_map in writes_by_ch_by_cid.values():
-        for ws in cid_map.values():
-            ws.sort(key=lambda w: (w[2], w[3]))
-
-    result: dict[str, DeltaChannelHistory] = {}
-    for ch in channels:
-        chain_cids = chain_by_ch.get(ch, [])
-        cid_writes = writes_by_ch_by_cid.get(ch, {})
-        collected: list[PendingWrite] = []
-        # Chain is newest-first; iterate oldest-first for the public order.
-        for cid in reversed(chain_cids):
-            for type_tag, value_blob, task_id, _idx in cid_writes.get(cid, []):
-                collected.append(
-                    (task_id, ch, serde.loads_typed((type_tag, value_blob)))
-                )
-        entry: DeltaChannelHistory = {"writes": collected}
-        if ch in seeded:
-            entry["seed"] = seed_val_by_ch[ch]
-        result[ch] = entry
-    return result
@@ -4,7 +4,7 @@ import asyncio
 import json
 import random
 import threading
-from collections.abc import AsyncIterator, Callable, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Callable, Iterator, Sequence
 from contextlib import asynccontextmanager
 from typing import Any, TypeVar, cast

@@ -17,19 +17,12 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
    SerializerProtocol,
    get_checkpoint_id,
    get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer

-from langgraph.checkpoint.sqlite._delta import (
-    DELTA_STAGE1_SQL,
-    build_delta_channels_writes_history,
-    build_delta_stage2_sql,
-    step_walk_with_row,
-)
 from langgraph.checkpoint.sqlite.utils import search_where

 T = TypeVar("T", bound=Callable)
@@ -212,7 +205,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
        while True:
            try:
                yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]
+                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
                    self.loop,
                ).result()
            except StopAsyncIteration:
@@ -279,29 +272,6 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
            self.adelete_thread(thread_id), self.loop
        ).result()

-    def get_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Sync bridge to `aget_delta_channel_history`.
-
-        Mirrors the same cross-thread guard as `get_tuple` /
-        `delete_thread` — calling from the loop thread raises rather than
-        deadlocking.
-        """
-        try:
-            if asyncio.get_running_loop() is self.loop:
-                raise asyncio.InvalidStateError(
-                    "Synchronous calls to AsyncSqliteSaver are only allowed from a "
-                    "different thread. From the main thread, use the async interface. "
-                    "For example, use `await checkpointer.aget_delta_channel_history(...)`."
-                )
-        except RuntimeError:
-            pass
-        return asyncio.run_coroutine_threadsafe(
-            self.aget_delta_channel_history(config=config, channels=channels),
-            self.loop,
-        ).result()
-
    async def setup(self) -> None:
        """Set up the checkpoint database asynchronously.

@@ -619,83 +589,6 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
            )
            await self.conn.commit()

-    async def aget_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
-
-        See `SqliteSaver.get_delta_channel_history` for design notes; this
-        is the async equivalent using `aiosqlite` cursors. Stage 1 pages
-        the parent chain newest-first and Python-deserializes each
-        checkpoint blob to find per-channel snapshots; stage 2 fetches
-        only the relevant writes via per-channel UNION ALL.
-        """
-        if not channels:
-            return {}
-        channels = list(channels)
-        await self.setup()
-        thread_id = str(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 {ch: {"writes": []} for ch in channels}
-            checkpoint_id = target.config["configurable"]["checkpoint_id"]
-
-        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
-        seed_val_by_ch: dict[str, Any] = {}
-        walk_state: dict[str, Any] = {}
-        seeded: set[str] = set()
-
-        async with self.lock, self.conn.cursor() as cur:
-            await cur.execute(
-                DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id)
-            )
-            async for row in cur:
-                cid, parent_cid, type_tag, blob = row
-                if step_walk_with_row(
-                    cid=cid,
-                    parent_cid=parent_cid,
-                    type_tag=type_tag,
-                    blob=blob,
-                    target_id=checkpoint_id,
-                    serde=self.serde,
-                    chain_by_ch=chain_by_ch,
-                    seed_val_by_ch=seed_val_by_ch,
-                    walk_state=walk_state,
-                    seeded=seeded,
-                    channels=channels,
-                ):
-                    break
-
-            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
-            stage2_sql = build_delta_stage2_sql(
-                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
-            )
-            if stage2_sql:
-                stage2_params: list[Any] = []
-                for ch in channels_with_chain:
-                    stage2_params.extend(
-                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
-                    )
-                await cur.execute(stage2_sql, stage2_params)
-                stage2_rows = cast(
-                    "list[tuple[str, str, str, int, str, bytes]]",
-                    await cur.fetchall(),
-                )
-            else:
-                stage2_rows = []
-
-        return build_delta_channels_writes_history(
-            channels=channels,
-            chain_by_ch=chain_by_ch,
-            seed_val_by_ch=seed_val_by_ch,
-            seeded=seeded,
-            stage2_rows=stage2_rows,
-            serde=self.serde,
-        )
-
    def get_next_version(self, current: str | None, channel: None) -> str:
        """Generate the next version ID for a channel.

@@ -24,13 +24,11 @@ from langgraph.store.base.batch import AsyncBatchedBaseStore

 from langgraph.store.sqlite.base import (
    _PLACEHOLDER,
-    NS_MATCH_FUNCTION,
    BaseSqliteStore,
    SqliteIndexConfig,
    _decode_ns_text,
    _ensure_index_config,
    _group_ops,
-    _namespace_match,
    _row_to_item,
    _row_to_search_item,
 )
@@ -152,13 +150,6 @@ class AsyncSqliteStore(AsyncBatchedBaseStore, BaseSqliteStore):
            if self.is_setup:
                return

-            # list_namespaces needs segment-aware matching, which SQLite cannot
-            # express in LIKE or GLOB. Registered here rather than in __init__
-            # because aiosqlite's create_function is a coroutine.
-            await self.conn.create_function(
-                NS_MATCH_FUNCTION, 2, _namespace_match, deterministic=True
-            )
-
            # Create migrations table if it doesn't exist
            await self.conn.execute(
                """
@@ -93,74 +93,12 @@ class SqliteIndexConfig(IndexConfig):
    pass


-NS_MATCH_FUNCTION = "_langgraph_namespace_match"
-"""SQLite user function backing segment-aware namespace matching.
-
-Registered under a private name rather than overriding `REGEXP`, so a caller's
-own `REGEXP` is left untouched.
-"""
-
-
-def _namespace_match(prefix: str | None, pattern: str) -> int:
-    """Backing implementation of `NS_MATCH_FUNCTION`."""
-    if prefix is None:
-        return 0
-    return 1 if re.search(pattern, prefix) else 0
-
-
-def _escape_glob_literal(text: str) -> str:
-    """Escape GLOB metacharacters so `text` is matched literally.
-
-    GLOB has no `ESCAPE` clause, so metacharacters are wrapped in a character
-    class instead. `]` is literal outside a class and needs no escaping.
-    """
-    return text.replace("[", "[[]").replace("*", "[*]").replace("?", "[?]")
-
-
-def _namespace_prefix_condition(
-    namespace_prefix: tuple[str, ...], column: str = "prefix"
-) -> tuple[str, tuple[str, ...]]:
-    """Build the SQL scoping a search to a namespace and its descendants.
-
-    Matches the namespace exactly or requires the `.` separator before any
-    remainder, so a prefix of `("foo",)` does not also match `("foobar",)`.
-
-    Uses GLOB rather than LIKE because SQLite's LIKE is case-insensitive for
-    ASCII, which would match `("FOO",)` for a prefix of `("foo",)` even though
-    `get`/`put`/`delete` compare with `=` and treat those as distinct.
-
-    An empty prefix is unconstrained and matches every namespace.
-    """
-    if not namespace_prefix:
-        return "TRUE", ()
-    path = _namespace_to_text(namespace_prefix)
-    condition = f"({column} = ? OR {column} GLOB ?)"
-    return condition, (path, f"{_escape_glob_literal(path)}.*")
-
-
-def _namespace_match_pattern(path: tuple[str, ...], match_type: str) -> str:
-    """Build a regex matching the dot-joined prefix on whole namespace segments.
-
-    Needed because neither LIKE nor GLOB can express "any character except the
-    separator": GLOB has character classes but no quantifier, so `[^.]*` still
-    crosses `.`. Matches how `InMemoryStore` compares namespaces element-wise.
-
-    `*` matches exactly one segment. Prefix matches stay open-ended but must end
-    on a separator; suffix matches anchor at the end and begin on one.
-
-    Examples:
-        prefix ("uid", "*", "alice") -> ^uid\\.[^.]+\\.alice(\\.|\\Z)
-        suffix ("alice",)            -> (^|\\.)alice\\Z
-    """
-    segments = ("[^.]+" if part == "*" else re.escape(part) for part in path)
-    body = r"\.".join(segments)
-    if match_type == "suffix":
-        return rf"(^|\.){body}\Z"
-    return rf"^{body}(\.|\Z)"
-
-
-def _namespace_to_text(namespace: tuple[str, ...]) -> str:
+def _namespace_to_text(
+    namespace: tuple[str, ...], handle_wildcards: bool = False
+) -> str:
    """Convert namespace tuple to text string."""
+    if handle_wildcards:
+        namespace = tuple("%" if val == "*" else val for val in namespace)
    return ".".join(namespace)


@@ -523,11 +461,8 @@ class BaseSqliteStore:
                    else " AND " + " AND ".join(filter_conditions)
                )
                if op.namespace_prefix:
-                    ns_condition, ns_args_tuple = _namespace_prefix_condition(
-                        op.namespace_prefix, column="s.prefix"
-                    )
-                    prefix_filter_str = f"WHERE {ns_condition} {filter_str} "
-                    ns_args: Sequence = ns_args_tuple
+                    prefix_filter_str = f"WHERE s.prefix LIKE ? {filter_str} "
+                    ns_args: Sequence = (f"{_namespace_to_text(op.namespace_prefix)}%",)
                else:
                    ns_args = ()
                    if filter_str:
@@ -568,15 +503,12 @@ class BaseSqliteStore:
                ]
            # Regular search branch (no vector search)
            else:
-                ns_condition, ns_args_tuple = _namespace_prefix_condition(
-                    op.namespace_prefix
-                )
-                base_query = f"""
+                base_query = """
                    SELECT prefix, key, value, created_at, updated_at, expires_at, ttl_minutes, NULL as score
                    FROM store
-                    WHERE {ns_condition}
+                    WHERE prefix LIKE ?
                """
-                params = list(ns_args_tuple)
+                params = [f"{_namespace_to_text(op.namespace_prefix)}%"]

                if filter_conditions:
                    params.extend(filter_params)
@@ -617,28 +549,16 @@ class BaseSqliteStore:

            if op.match_conditions:
                for cond in op.match_conditions:
-                    if cond.match_type in ("prefix", "suffix"):
-                        if not cond.path:
-                            # An empty path constrains nothing; skipping keeps it a
-                            # no-op rather than emitting a pattern that matches no
-                            # namespace at all.
-                            continue
-                        if cond.match_type == "prefix" and "*" not in cond.path:
-                            # Equivalent to the anchored pattern, but SQLite can
-                            # satisfy `=` and a trailing-wildcard GLOB from
-                            # store_prefix_idx. The user function is opaque to the
-                            # planner, so it would scan every row and call back
-                            # into Python for each one.
-                            condition, args = _namespace_prefix_condition(
-                                tuple(cond.path)
-                            )
-                            where_clauses.append(condition)
-                            params.extend(args)
-                        else:
-                            where_clauses.append(f"{NS_MATCH_FUNCTION}(prefix, ?) = 1")
-                            params.append(
-                                _namespace_match_pattern(cond.path, cond.match_type)
-                            )
+                    if cond.match_type == "prefix":
+                        where_clauses.append("prefix LIKE ?")
+                        params.append(
+                            f"{_namespace_to_text(cond.path, handle_wildcards=True)}%"
+                        )
+                    elif cond.match_type == "suffix":
+                        where_clauses.append("prefix LIKE ?")
+                        params.append(
+                            f"%{_namespace_to_text(cond.path, handle_wildcards=True)}"
+                        )
                    else:
                        logger.warning(
                            "Unknown match_type in list_namespaces: %s", cond.match_type
@@ -865,9 +785,6 @@ class SqliteStore(BaseSqliteStore, BaseStore):
        super().__init__()
        self._deserializer = deserializer
        self.conn = conn
-        # Registered here rather than in from_conn_string so a caller-supplied
-        # connection also gets it.
-        conn.create_function(NS_MATCH_FUNCTION, 2, _namespace_match, deterministic=True)
        self.lock = threading.Lock()
        self.is_setup = False
        self.index_config = index
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint-sqlite"
-version = "3.1.1"
+version = "3.0.3"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,14 +12,14 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=4.1.0,<5.0.0",
+    "langgraph-checkpoint>=3,<5.0.0",
    "aiosqlite>=0.20",
    "sqlite-vec>=0.1.6",
 ]

 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-sqlite"
-Twitter = "https://x.com/langchain_oss"
+Twitter = "https://x.com/LangChain"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"

@@ -30,13 +30,12 @@ test = [
  "pytest-mock",
  "pytest-watcher",
  "langgraph-checkpoint",
-  "langgraph-checkpoint-conformance",
  "pytest-retry>=1.7.0",
 ]
 lint = [
  "ruff",
  "codespell",
-  "ty",
+  "mypy",
 ]
 dev = [
  {include-group = "test"},
@@ -48,7 +47,6 @@ default-groups = ['dev']

 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
-langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }

 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -64,29 +62,23 @@ lint.select = [
  "UP", # pyupgrade
  "B",  # flake8-bugbear
  "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
  "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
 target-version = "py310"

-[tool.ty.rules]
-invalid-argument-type = "ignore"
-invalid-assignment = "ignore"
-invalid-key = "ignore"
-invalid-method-override = "ignore"
-invalid-return-type = "ignore"
-invalid-yield = "ignore"
-not-iterable = "ignore"
-not-subscriptable = "ignore"
-unused-type-ignore-comment = "ignore"
-unresolved-attribute = "ignore"
-unresolved-import = "ignore"
-unsupported-operator = "ignore"
-
 [tool.pytest-watcher]
 now = true
 delay = 0.1
 runner_args = ["--ff", "-v", "--tb", "short"]
 patterns = ["*.py"]
+
+[tool.mypy]
+# https://mypy.readthedocs.io/en/stable/config_file.html
+disallow_untyped_defs = "True"
+explicit_package_bases = "True"
+warn_no_return = "False"
+warn_unused_ignores = "True"
+warn_redundant_casts = "True"
+allow_redefinition = "True"
+disable_error_code = "typeddict-item, return-value"
@@ -1,3 +1,4 @@
+# mypy: disable-error-code="union-attr,arg-type,index,operator"
 import asyncio
 import os
 import tempfile
@@ -716,32 +717,3 @@ async def test_search_items(
        for ns in test_namespaces:
            key = f"item_{ns[-1]}"
            await store.adelete(ns, key)
-
-
-async def test_async_namespace_segment_boundary(store: AsyncSqliteStore) -> None:
-    """Segment-aware scoping on the async path.
-
-    Also covers that the namespace-match SQLite function is registered on the
-    async connection -- aiosqlite's create_function is a coroutine, so it is
-    registered in setup() rather than __init__.
-    """
-    for namespace in [
-        ("foo",),
-        ("foo", "child"),
-        ("foobar",),
-        ("uid", "users", "alice"),
-        ("uid", "users", "malice"),
-        ("user_1",),
-        ("userX1",),
-    ]:
-        await store.aput(namespace, "k", {"v": 1})
-
-    found = {item.namespace for item in await store.asearch(("foo",), limit=100)}
-    assert found == {("foo",), ("foo", "child")}
-
-    found = {item.namespace for item in await store.asearch(("user_1",), limit=100)}
-    assert found == {("user_1",)}
-
-    assert set(await store.alist_namespaces(suffix=["alice"], limit=100)) == {
-        ("uid", "users", "alice"),
-    }
@@ -1,28 +0,0 @@
-"""Run delta-channel conformance capabilities against AsyncSqliteSaver."""
-
-from __future__ import annotations
-
-import pytest
-from langgraph.checkpoint.conformance import validate
-from langgraph.checkpoint.conformance.initializer import checkpointer_test
-
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
-
-
-@pytest.mark.asyncio
-async def test_delta_channel_conformance():
-    @checkpointer_test(name="AsyncSqliteSaver")
-    async def sqlite_saver():
-        async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
-            yield saver
-
-    report = await validate(
-        sqlite_saver,
-        capabilities={
-            "delta_channel_history",
-        },
-    )
-    for cap, result in report.results.items():
-        if result.passed is False:
-            details = "\n".join(result.failures or [])
-            pytest.fail(f"Capability {cap} failed:\n{details}")
@@ -1,170 +0,0 @@
-"""Sqlite-specific migration smoke tests: BinaryOperatorAggregate -> DeltaChannel.
-
-Mirrors `libs/langgraph/tests/test_delta_channel_migration.py` (which
-covers `InMemorySaver` + a third-party fallback to the base default
-impl). This file exercises the same migration scenario through the
-sqlite-specific `SqliteSaver.get_delta_channel_history` override —
-specifically that the streaming ancestor walk finds a pre-migration
-plain `channel_values[ch]` entry and surfaces it as the `seed`, with
-post-migration writes folding on top through the reducer.
-
-Pre-migration checkpoints under `BinaryOperatorAggregate` carry the
-full accumulated value at every settled super-step boundary. The
-override has to identify those as "real" seeds (not `_DeltaSnapshot`
-sentinels) — the saver layer is intentionally delta-agnostic and just
-returns whatever is stored in `channel_values[ch]`.
-"""
-
-from __future__ import annotations
-
-import operator
-from typing import Annotated, Any
-
-import pytest
-from langchain_core.runnables import RunnableConfig
-
-# `langgraph` core isn't a dep of `langgraph-checkpoint-sqlite`. Skip the
-# whole module rather than importerror-ing in the standalone CI shape.
-pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
-pytest.importorskip("langgraph.channels.binop", reason="langgraph core not installed")
-pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
-
-from langgraph.channels.binop import BinaryOperatorAggregate  # type: ignore[import-untyped]  # noqa: I001
-from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]
-from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]
-from typing_extensions import TypedDict
-
-from langgraph.checkpoint.sqlite import SqliteSaver
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
-
-pytestmark = pytest.mark.anyio
-
-
-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: RunnableConfig, tag: str, n: int) -> None:
-    for i in range(n):
-        graph.invoke({"items": [f"{tag}{i}"]}, config)
-
-
-async def _adrive(graph: Any, config: RunnableConfig, 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[RunnableConfig, list]]:
-    """`(config, items)` for every checkpoint with `next == ('__start__',)`
-    — the stable inter-invoke boundaries that round-trip predictably.
-    """
-    return [
-        (s.config, list(s.values.get("items", [])))
-        for s in history
-        if s.next == ("__start__",)
-    ]
-
-
-def test_migration_preserves_pre_migration_state_sync() -> None:
-    """Drive 3 invokes under `BinaryOperatorAggregate`, swap the
-    annotation to `DeltaChannel` on the same sqlite-backed thread, and
-    verify every settled pre-migration boundary round-trips exactly.
-
-    The override's streaming walk must identify the plain accumulated
-    list at each pre-migration ancestor as a valid `seed` even though
-    no `_DeltaSnapshot` was ever written there.
-    """
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "mig-sync"}}
-
-        binop = _binop_graph(saver)
-        _drive(binop, config, "u", 3)
-
-        pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
-        assert len(pre_boundaries) >= 2, "expected multiple settled boundaries"
-
-        delta = _delta_graph(saver)
-        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', [])}"
-            )
-
-
-def test_migration_continued_thread_folds_deltas_on_seed_sync() -> None:
-    """After migration, driving one more super-step extends the
-    pre-migration accumulated state via the delta reducer — the seed
-    plus a single new write.
-    """
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "mig-continue-sync"}}
-
-        binop = _binop_graph(saver)
-        _drive(binop, config, "u", 3)
-
-        pre_history = list(binop.get_state_history(config))
-        pre_boundaries = _settled_boundaries(pre_history)
-        # Latest settled boundary — the leaf pre-migration state.
-        leaf_cfg, leaf_items = pre_boundaries[0]
-        assert leaf_items, "expected non-empty pre-migration leaf"
-
-        delta = _delta_graph(saver)
-        delta.invoke({"items": ["after-migration"]}, leaf_cfg)
-        new_state = delta.get_state(config).values["items"]
-        assert new_state[: len(leaf_items)] == leaf_items
-        assert "after-migration" in new_state
-
-
-async def test_migration_preserves_pre_migration_state_async() -> None:
-    """Async equivalent of the basic-migration round-trip check on
-    `AsyncSqliteSaver`."""
-    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "mig-async"}}
-
-        binop = _binop_graph(saver)
-        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(saver)
-        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']}"
-            )
@@ -1,271 +0,0 @@
-"""Smoke tests for `BaseCheckpointSaver.get_delta_channel_history` on sqlite.
-
-`SqliteSaver` (and `AsyncSqliteSaver`) deliberately don't override the
-default implementation in `BaseCheckpointSaver` — these tests pin the
-default impl to behave correctly end-to-end against a real persistent
-saver and a real `DeltaChannel`-backed graph.
-
-Scenarios covered:
-
-* Empty `channels` argument returns an empty mapping (no I/O).
-* On a non-trivial multi-checkpoint thread, per-channel writes come back
-  oldest→newest.
-* When the walk reaches the root without ever finding a stored value,
-  `seed` is omitted from the entry (consumer treats absence as "start
-  empty").
-* When a `_DeltaSnapshot` blob is present at an ancestor, it is returned
-  as the `seed`.
-* The async saver returns the same shape via `aget_delta_channel_history`.
-"""
-
-from __future__ import annotations
-
-import operator
-from typing import Annotated, Any
-
-import pytest
-from langchain_core.runnables import RunnableConfig
-
-# `langgraph` is not a dep of `langgraph-checkpoint-sqlite`. When tests run
-# in the sqlite lib's standalone CI environment without it installed, skip
-# the whole module rather than failing at import.
-pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
-pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
-
-from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: I001
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
-from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]
-from typing_extensions import TypedDict
-
-from langgraph.checkpoint.sqlite import SqliteSaver
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
-
-pytestmark = pytest.mark.anyio
-
-
-# ---------------------------------------------------------------------------
-# Graph helpers
-# ---------------------------------------------------------------------------
-
-
-def _noop(_state: Any) -> dict[str, Any]:
-    return {}
-
-
-class _DeltaState(TypedDict):
-    items: Annotated[list, DeltaChannel(operator.add)]
-
-
-def _delta_graph(checkpointer: Any) -> Any:
-    return (
-        StateGraph(_DeltaState)
-        .add_node("noop", _noop)
-        .add_edge(START, "noop")
-        .add_edge("noop", END)
-        .compile(checkpointer=checkpointer)
-    )
-
-
-def _drive(graph: Any, config: RunnableConfig, n: int) -> None:
-    for i in range(n):
-        graph.invoke({"items": [f"v{i}"]}, config)
-
-
-async def _adrive(graph: Any, config: RunnableConfig, n: int) -> None:
-    for i in range(n):
-        await graph.ainvoke({"items": [f"v{i}"]}, config)
-
-
-def _pick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
-    """Return a config pointing at a checkpoint that has at least one ancestor.
-
-    `get_delta_channel_history` walks the parent chain — calling it on the root
-    checkpoint produces `writes=[]` and no `seed`, which is uninteresting
-    for the multi-step assertions below.
-    """
-    history = list(saver.list(config))
-    assert history, "expected non-empty history"
-    # `list` yields newest→oldest; the second entry has the first entry
-    # as its parent, so its parent_config is non-None.
-    for tup in history:
-        if tup.parent_config is not None:
-            return tup.config
-    raise AssertionError("no checkpoint with a parent in history")
-
-
-async def _apick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
-    history = [tup async for tup in saver.alist(config)]
-    assert history, "expected non-empty history"
-    for tup in history:
-        if tup.parent_config is not None:
-            return tup.config
-    raise AssertionError("no checkpoint with a parent in history")
-
-
-# ---------------------------------------------------------------------------
-# Sync: SqliteSaver
-# ---------------------------------------------------------------------------
-
-
-def test_empty_channels_returns_empty_mapping_sync() -> None:
-    """Empty `channels` short-circuits to `{}` without touching storage."""
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "empty"}}
-        assert saver.get_delta_channel_history(config=config, channels=[]) == {}
-
-
-def test_writes_history_oldest_to_newest_sync() -> None:
-    """Per-channel writes accumulated across the walk come back oldest→newest."""
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "history-sync"}}
-        graph = _delta_graph(saver)
-        _drive(graph, config, 3)
-
-        target_cfg = _pick_non_root(saver, config)
-        result = saver.get_delta_channel_history(config=target_cfg, channels=["items"])
-
-        assert "items" in result
-        entry = result["items"]
-        assert isinstance(entry["writes"], list)
-
-        # If any writes were collected, their values should be in oldest→newest
-        # order — i.e. tagged 'v0', 'v1', ... matching invoke order.
-        write_values: list[Any] = []
-        for _task_id, channel, value in entry["writes"]:
-            assert channel == "items"
-            write_values.extend(value if isinstance(value, list) else [value])
-
-        # `_drive` invokes with payloads ['v0'], ['v1'], ['v2']. Whatever
-        # subset shows up in the chain must be a contiguous prefix in order.
-        for idx, val in enumerate(write_values):
-            assert val == f"v{idx}", (
-                f"writes not in oldest→newest order: {write_values}"
-            )
-
-
-def test_seed_present_when_snapshot_in_ancestor_sync() -> None:
-    """Inserting a `_DeltaSnapshot` blob at an ancestor → walk returns it as `seed`."""
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "seed-sync"}}
-        graph = _delta_graph(saver)
-        _drive(graph, config, 2)
-
-        # Find the oldest non-root checkpoint, then walk to its parent and
-        # rewrite that parent's `channel_values["items"]` to a real
-        # `_DeltaSnapshot`. After this surgery, calling `get_delta_channel_history`
-        # at the leaf must return the snapshot value as `seed`.
-        history = list(saver.list(config))
-        assert len(history) >= 2
-        leaf_tup = history[0]
-        # Walk to an ancestor with a parent_config (any non-root will do).
-        ancestor_tup = next(
-            (tup for tup in history if tup.parent_config is not None), None
-        )
-        assert ancestor_tup is not None
-        parent_cfg = ancestor_tup.parent_config
-        assert parent_cfg is not None
-        parent_tup = saver.get_tuple(parent_cfg)
-        assert parent_tup is not None
-
-        snapshot_value = ["seeded", "items"]
-        parent_tup.checkpoint["channel_values"]["items"] = _DeltaSnapshot(
-            snapshot_value
-        )
-        # Make sure the channel has a version so the optimized blob lookup
-        # in any future override has something to hit.
-        parent_tup.checkpoint["channel_versions"].setdefault("items", 1)
-        saver.put(
-            parent_tup.parent_config or {"configurable": parent_cfg["configurable"]},
-            parent_tup.checkpoint,
-            parent_tup.metadata,
-            {},
-        )
-
-        result = saver.get_delta_channel_history(
-            config=leaf_tup.config, channels=["items"]
-        )
-        entry = result["items"]
-        assert "seed" in entry, f"expected seed to be present, got {entry}"
-        seed = entry["seed"]
-        assert isinstance(seed, _DeltaSnapshot), (
-            f"expected _DeltaSnapshot, got {seed!r}"
-        )
-        assert seed.value == snapshot_value
-
-
-def test_seed_omitted_when_walk_reaches_root_sync() -> None:
-    """`get_delta_channel_history` on the root checkpoint → no `seed` key, no writes."""
-    with SqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "root-sync"}}
-        graph = _delta_graph(saver)
-        _drive(graph, config, 1)
-
-        history = list(saver.list(config))
-        # Root is the oldest checkpoint (no parent_config).
-        root_tup = history[-1]
-        assert root_tup.parent_config is None
-
-        result = saver.get_delta_channel_history(
-            config=root_tup.config, channels=["items"]
-        )
-        entry = result["items"]
-        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
-        assert entry["writes"] == []
-
-
-# ---------------------------------------------------------------------------
-# Async: AsyncSqliteSaver
-# ---------------------------------------------------------------------------
-
-
-async def test_empty_channels_returns_empty_mapping_async() -> None:
-    """Async equivalent of the empty-channels short-circuit."""
-    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "empty-async"}}
-        assert await saver.aget_delta_channel_history(config=config, channels=[]) == {}
-
-
-async def test_writes_history_oldest_to_newest_async() -> None:
-    """Async equivalent of the oldest→newest ordering check."""
-    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "history-async"}}
-        graph = _delta_graph(saver)
-        await _adrive(graph, config, 3)
-
-        target_cfg = await _apick_non_root(saver, config)
-        result = await saver.aget_delta_channel_history(
-            config=target_cfg, channels=["items"]
-        )
-
-        assert "items" in result
-        entry = result["items"]
-        assert isinstance(entry["writes"], list)
-
-        write_values: list[Any] = []
-        for _task_id, channel, value in entry["writes"]:
-            assert channel == "items"
-            write_values.extend(value if isinstance(value, list) else [value])
-
-        for idx, val in enumerate(write_values):
-            assert val == f"v{idx}", (
-                f"writes not in oldest→newest order: {write_values}"
-            )
-
-
-async def test_seed_omitted_when_walk_reaches_root_async() -> None:
-    """Async equivalent of the root-walk seed-absence check."""
-    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
-        config: RunnableConfig = {"configurable": {"thread_id": "root-async"}}
-        graph = _delta_graph(saver)
-        await _adrive(graph, config, 1)
-
-        history = [tup async for tup in saver.alist(config)]
-        root_tup = history[-1]
-        assert root_tup.parent_config is None
-
-        result = await saver.aget_delta_channel_history(
-            config=root_tup.config, channels=["items"]
-        )
-        entry = result["items"]
-        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
-        assert entry["writes"] == []
@@ -1,11 +1,8 @@
-import math
+# mypy: disable-error-code="union-attr,arg-type,index,operator"
 import os
-import random
 import re
 import tempfile
-import time
 import uuid
-from collections import Counter, defaultdict
 from collections.abc import Generator, Iterable
 from contextlib import contextmanager
 from typing import Any, Literal, cast
@@ -22,13 +19,7 @@ from langgraph.store.base import (
 )

 from langgraph.store.sqlite import SqliteStore
-from langgraph.store.sqlite.base import (
-    NS_MATCH_FUNCTION,
-    BaseSqliteStore,
-    SqliteIndexConfig,
-    _escape_glob_literal,
-    _namespace_match_pattern,
-)
+from langgraph.store.sqlite.base import SqliteIndexConfig


 # Local embeddings implementation for testing vector search
@@ -37,6 +28,10 @@ class CharacterEmbeddings(Embeddings):

    def __init__(self, dims: int = 50, seed: int = 42):
        """Initialize with embedding dimensions and random seed."""
+        import math
+        import random
+        from collections import defaultdict
+
        self._rng = random.Random(seed)
        self.dims = dims
        # Create projection vector for each character lazily
@@ -48,6 +43,9 @@ class CharacterEmbeddings(Embeddings):

    def _embed_one(self, text: str) -> list[float]:
        """Embed a single text."""
+        import math
+        from collections import Counter
+
        counts = Counter(text)
        total = sum(counts.values())

@@ -335,6 +333,8 @@ class TestSqliteStore:

            # Test update
            # Small delay to ensure the updated timestamp is different
+            import time
+
            time.sleep(0.01)

            updated_value = {"title": "Updated Document", "content": "Hello, Updated!"}
@@ -1230,208 +1230,3 @@ def test_non_ascii(
        assert result3[0].key == "3"
        assert result4[0].key == "4"
        assert result5[0].key == "5"
-
-
-def test_escape_glob_literal() -> None:
-    assert _escape_glob_literal("users.alice") == "users.alice"
-    # "_" and "%" are LIKE wildcards but literal in GLOB, so they are left alone.
-    assert _escape_glob_literal("user_1") == "user_1"
-    assert _escape_glob_literal("100%") == "100%"
-    assert _escape_glob_literal("a*b") == "a[*]b"
-    assert _escape_glob_literal("a?b") == "a[?]b"
-    assert _escape_glob_literal("a[b") == "a[[]b"
-
-
-def test_namespace_match_pattern() -> None:
-    assert _namespace_match_pattern(("foo",), "prefix") == r"^foo(\.|\Z)"
-    assert (
-        _namespace_match_pattern(("uid", "*", "alice"), "prefix")
-        == r"^uid\.[^.]+\.alice(\.|\Z)"
-    )
-    assert _namespace_match_pattern(("alice",), "suffix") == r"(^|\.)alice\Z"
-
-
-def test_search_namespace_segment_boundary(store: SqliteStore) -> None:
-    """Prefix scoping must stop at namespace segment boundaries.
-
-    Namespaces are stored dot-joined, so matching the raw text also returns
-    siblings sharing leading characters.
-    """
-    for namespace in [
-        ("foo",),
-        ("foo", "child"),
-        ("foo", "child", "deep"),
-        ("foobar",),
-        ("foobar", "baz"),
-        ("foo2",),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
-        return {item.namespace for item in store.search(prefix, limit=100)}
-
-    assert _namespaces(("foo",)) == {
-        ("foo",),
-        ("foo", "child"),
-        ("foo", "child", "deep"),
-    }
-    # The sibling scope is independent, not merely narrower.
-    assert _namespaces(("foobar",)) == {("foobar",), ("foobar", "baz")}
-    assert _namespaces(("foo2",)) == {("foo2",)}
-    assert _namespaces(("fo",)) == set()
-
-
-def test_search_namespace_wildcard_chars_are_literal(store: SqliteStore) -> None:
-    """LIKE and GLOB metacharacters in labels must be matched literally."""
-    for namespace in [
-        ("user_1",),
-        ("user_1", "child"),
-        ("userX1",),
-        ("a%b",),
-        ("axxb",),
-        ("star*",),
-        ("starX",),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
-        return {item.namespace for item in store.search(prefix, limit=100)}
-
-    # Also asserts each namespace still matches itself, which catches escaping
-    # the equality arm by mistake.
-    assert _namespaces(("user_1",)) == {("user_1",), ("user_1", "child")}
-    assert _namespaces(("a%b",)) == {("a%b",)}
-    assert _namespaces(("star*",)) == {("star*",)}
-
-
-def test_search_namespace_is_case_sensitive(store: SqliteStore) -> None:
-    """Search must agree with get/put, which compare namespaces with `=`.
-
-    SQLite's LIKE is case-insensitive for ASCII, so matching with it conflated
-    namespaces that every other operation treats as distinct.
-    """
-    store.put(("Foo",), "k", {"v": "upper"})
-    store.put(("foo",), "k", {"v": "lower"})
-
-    assert {item.namespace for item in store.search(("foo",), limit=100)} == {("foo",)}
-    assert {item.namespace for item in store.search(("Foo",), limit=100)} == {("Foo",)}
-
-
-def test_list_namespaces_segment_boundary(store: SqliteStore) -> None:
-    for namespace in [
-        ("foo",),
-        ("foo", "child"),
-        ("foobar",),
-        ("foobar", "baz"),
-        ("uid", "users", "alice"),
-        ("uid", "users", "malice"),
-        ("uid", "a", "b", "alice"),
-    ]:
-        store.put(namespace, "k", {"v": 1})
-
-    assert set(store.list_namespaces(prefix=["foo"], limit=100)) == {
-        ("foo",),
-        ("foo", "child"),
-    }
-    # Suffix must align to a segment: "malice" does not end with the "alice"
-    # segment.
-    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
-        ("uid", "users", "alice"),
-        ("uid", "a", "b", "alice"),
-    }
-    # "*" spans exactly one segment.
-    assert set(store.list_namespaces(prefix=["uid", "*", "alice"], limit=100)) == {
-        ("uid", "users", "alice"),
-    }
-    # Prefix matching stays open-ended across depth.
-    assert set(store.list_namespaces(prefix=["uid"], limit=100)) == {
-        ("uid", "users", "alice"),
-        ("uid", "users", "malice"),
-        ("uid", "a", "b", "alice"),
-    }
-
-
-def test_search_empty_prefix_is_unconstrained(store: SqliteStore) -> None:
-    """An empty prefix constrains nothing and must return every namespace."""
-    for namespace in [("a",), ("b", "c"), ("d", "e", "f")]:
-        store.put(namespace, "k", {"v": 1})
-
-    assert {item.namespace for item in store.search((), limit=100)} == {
-        ("a",),
-        ("b", "c"),
-        ("d", "e", "f"),
-    }
-
-
-def test_namespace_labels_with_trailing_newline(store: SqliteStore) -> None:
-    """Labels may contain newlines, and must not match a differently-named label.
-
-    Python's `$` also matches just before a trailing newline, so the patterns use
-    `\\Z` to anchor at the true end of the string.
-    """
-    store.put(("users", "alice"), "k", {"v": 1})
-    store.put(("users", "alice\n"), "k", {"v": 2})
-
-    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
-        ("users", "alice"),
-    }
-    assert set(store.list_namespaces(prefix=["users", "alice"], limit=100)) == {
-        ("users", "alice"),
-    }
-
-
-def test_list_namespaces_prefix_uses_indexable_condition() -> None:
-    """Plain prefixes must use the indexable condition, not the match function.
-
-    A user function is opaque to the query planner, so it scans every row and
-    calls back into Python for each one. Only suffix and wildcard paths, which
-    no SQLite operator can express, need it.
-    """
-    store = BaseSqliteStore()
-
-    def where(match_type: str, path: tuple[str, ...]) -> str:
-        op = ListNamespacesOp(
-            match_conditions=(MatchCondition(match_type=match_type, path=path),),
-            max_depth=None,
-            limit=10,
-            offset=0,
-        )
-        query, _ = store._get_batch_list_namespaces_queries([(0, op)])[0]
-        return " ".join(query.split())
-
-    assert "GLOB" in where("prefix", ("uid", "users"))
-    assert NS_MATCH_FUNCTION not in where("prefix", ("uid", "users"))
-    # A label that merely contains "*" is not the wildcard.
-    assert "GLOB" in where("prefix", ("star*",))
-    # Wildcard and suffix cannot be expressed by GLOB, so they keep the function.
-    assert NS_MATCH_FUNCTION in where("prefix", ("uid", "*", "alice"))
-    assert NS_MATCH_FUNCTION in where("suffix", ("alice",))
-
-
-def test_list_namespaces_metacharacter_labels(store: SqliteStore) -> None:
-    """Metacharacters in labels are literal on both matching paths.
-
-    Plain prefixes take the `= OR GLOB` condition and wildcard/suffix paths take
-    the regex function, so escaping has to hold in two different syntaxes.
-    """
-    pairs = [
-        ("star*", "starX"),
-        ("q?m", "qXm"),
-        ("br[ack]et", "brXacXket"),
-        ("user_1", "userX1"),
-        ("a%b", "axxb"),
-        ("plus+", "plusX"),
-    ]
-    for label, decoy in pairs:
-        store.put((label,), "k", {"v": 1})
-        store.put((decoy,), "k", {"v": 1})
-        store.put((label, "child"), "k", {"v": 1})
-
-    for label, decoy in pairs:
-        found = set(store.list_namespaces(prefix=[label], limit=100))
-        assert found == {(label,), (label, "child")}
-        # The decoy differs only where the metacharacter would have matched.
-        assert (decoy,) not in found
-        assert set(store.list_namespaces(prefix=[label, "child"], limit=100)) == {
-            (label, "child"),
-        }
@@ -1,10 +1,6 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
-resolution-markers = [
-    "python_full_version >= '3.15'",
-    "python_full_version < '3.15'",
-]

 [[package]]
 name = "aiosqlite"
@@ -147,11 +143,11 @@ wheels = [

 [[package]]
 name = "codespell"
-version = "2.4.3"
+version = "2.4.2"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/80/19/45e941380f69c042b43423513d201e6592346f992394347f5e7174c31407/codespell-2.4.3.tar.gz", hash = "sha256:cbe085e331227b37bb86ef8bddd08dc768c704ee9a07ca869852c093fa2793e2", size = 352773, upload-time = "2026-07-15T11:51:54.159Z" }
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+    { url = "https://files.pythonhosted.org/packages/42/a1/52fa05533e95fe45bcc09bcf8a503874b1c08f221a4e35608017e0938f55/codespell-2.4.2-py3-none-any.whl", hash = "sha256:97e0c1060cf46bd1d5db89a936c98db8c2b804e1fdd4b5c645e82a1ec6b1f886", size = 353715, upload-time = "2026-03-05T18:10:41.398Z" },
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 [[package]]
@@ -168,7 +164,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -214,11 +210,11 @@ wheels = [

 [[package]]
 name = "idna"
-version = "3.15"
+version = "3.11"
 source = { registry = "https://pypi.org/simple" }
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+    { url = "https://files.pythonhosted.org/packages/0e/61/66938bbb5fc52dbdf84594873d5b51fb1f7c7794e9c0f5bd885f30bc507b/idna-3.11-py3-none-any.whl", hash = "sha256:771a87f49d9defaf64091e6e6fe9c18d4833f140bd19464795bc32d966ca37ea", size = 71008, upload-time = "2025-10-12T14:55:18.883Z" },
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 [[package]]
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 [[package]]
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-version = "1.5.2"
+version = "1.2.22"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
-    { name = "langchain-protocol" },
    { name = "langsmith" },
    { name = "packaging" },
    { name = "pydantic" },
@@ -266,26 +261,14 @@ dependencies = [
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    { name = "uuid-utils" },
 ]
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-
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-version = "0.0.18"
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 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.0.1"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -302,6 +285,7 @@ requires-dist = [
 dev = [
    { name = "codespell" },
    { name = "dataclasses-json" },
+    { name = "mypy" },
    { name = "numpy" },
    { name = "pandas" },
    { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
@@ -312,12 +296,11 @@ dev = [
    { name = "pytest-watcher" },
    { name = "redis" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 lint = [
    { name = "codespell" },
+    { name = "mypy" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 test = [
    { name = "dataclasses-json" },
@@ -331,36 +314,9 @@ test = [
    { name = "redis" },
 ]

-[[package]]
-name = "langgraph-checkpoint-conformance"
-version = "0.0.2"
-source = { editable = "../checkpoint-conformance" }
-dependencies = [
-    { name = "langgraph-checkpoint" },
-]
-
-[package.metadata]
-requires-dist = [{ name = "langgraph-checkpoint", editable = "../checkpoint" }]
-
-[package.metadata.requires-dev]
-dev = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-    { name = "ruff" },
-    { name = "ty" },
-]
-lint = [
-    { name = "ruff" },
-    { name = "ty" },
-]
-test = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-]
-
 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "3.1.1"
+version = "3.0.3"
 source = { editable = "." }
 dependencies = [
    { name = "aiosqlite" },
@@ -372,23 +328,21 @@ dependencies = [
 dev = [
    { name = "codespell" },
    { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
+    { name = "mypy" },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
    { name = "pytest-retry" },
    { name = "pytest-watcher" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 lint = [
    { name = "codespell" },
+    { name = "mypy" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 test = [
    { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
@@ -407,23 +361,21 @@ requires-dist = [
 dev = [
    { name = "codespell" },
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
+    { name = "mypy" },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
    { name = "pytest-retry", specifier = ">=1.7.0" },
    { name = "pytest-watcher" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 lint = [
    { name = "codespell" },
+    { name = "mypy" },
    { name = "ruff" },
-    { name = "ty" },
 ]
 test = [
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
    { name = "pytest" },
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
@@ -433,7 +385,7 @@ test = [

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+version = "0.6.4"
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@@ -443,13 +395,163 @@ dependencies = [
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    { name = "requests-toolbelt" },
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-    { name = "websockets" },
-    { name = "xxhash" },
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-
 [[package]]
 name = "zstandard"
 version = "0.25.0"
@@ -18,19 +18,22 @@ test_watch:

 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
+MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
+lint_tests: MYPY_CACHE=.mypy_cache_test

 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)" = "" ] || uv run ty check $(PYTHON_FILES)
+	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 type:
-	uv run ty check $(PYTHON_FILES)
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

 format format_diff:
 	uv run ruff format $(PYTHON_FILES)
@@ -1,26 +1,6 @@
 # LangGraph Checkpoint

-[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint?label=%20)](https://pypi.org/project/langgraph-checkpoint/#history)
-[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint)](https://opensource.org/licenses/MIT)
-[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint)](https://pypistats.org/packages/langgraph-checkpoint)
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
-
-To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
-[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
-
-## Quick Install
-
-```bash
-uv add langgraph-checkpoint
-```
-
-## 🤔 What is this?
-
-This library defines the base interface for LangGraph checkpointers. Checkpointers provide a persistence layer for LangGraph: they save graph state at every superstep, enabling human-in-the-loop, memory between interactions, durable execution, and more.
-
-## 📖 Documentation
-
-For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
+This library defines the base interface for LangGraph checkpointers. Checkpointers provide a persistence layer for LangGraph. They allow you to interact with and manage the graph's state. When you use a graph with a checkpointer, the checkpointer saves a _checkpoint_ of the graph state at every superstep, enabling several powerful capabilities like human-in-the-loop, "memory" between interactions and more.

 ## Key concepts

@@ -44,10 +24,7 @@ You must pass these when invoking the graph as part of the configurable part of

 ### Serde

-`langgraph-checkpoint` also defines protocol for serialization/deserialization (serde) and provides a 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.
+`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.

 ### Pending writes

@@ -109,13 +86,3 @@ checkpointer.get(read_config)
 # list checkpoints
 list(checkpointer.list(read_config))
 ```
-
-## 📕 Releases & Versioning
-
-See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
-
-## 💁 Contributing
-
-As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
-
-For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
@@ -3,7 +3,7 @@ from __future__ import annotations
 import copy
 import logging
 from collections.abc import AsyncIterator, Collection, Iterator, Mapping, Sequence
-from typing import (
+from typing import (  # noqa: UP035
    Any,
    Generic,
    Literal,
@@ -13,7 +13,6 @@ from typing import (
 )

 from langchain_core.runnables import RunnableConfig
-from typing_extensions import NotRequired

 from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_methods
@@ -29,8 +28,6 @@ from langgraph.checkpoint.serde.types import (

 V = TypeVar("V", int, float, str)
 PendingWrite = tuple[str, str, Any]
-
-
 logger = logging.getLogger(__name__)


@@ -60,30 +57,6 @@ class CheckpointMetadata(TypedDict, total=False):
    """
    run_id: str
    """The ID of the run that created this checkpoint."""
-    counters_since_delta_snapshot: dict[str, tuple[int, int]]
-    """Per-channel counters since the last `_DeltaSnapshot` was written.
-
-    !!! warning "Beta"
-
-        This metadata field backs `DeltaChannel` (beta). The key name and
-        contents may change while the delta-channel design stabilizes.
-
-    Maps channel name -> `(updates, supersteps)`:
-
-    - index 0 (`updates`): number of supersteps that wrote to this channel
-      since its last snapshot blob.
-    - index 1 (`supersteps`): total supersteps elapsed since this channel's
-      last snapshot, regardless of whether the channel was written.
-
-    A snapshot fires when EITHER `updates >= ch.snapshot_frequency` OR
-    `supersteps >= DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT` (system-wide bound,
-    default 5000, env `LANGGRAPH_DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`).
-    The supersteps bound prevents unbounded ancestor walks on threads where
-    a delta channel exists but is no longer being updated.
-
-    Absent on threads that don't use delta channels. Persisted as a
-    2-element list in JSON (no native tuple).
-    """


 ChannelVersions = dict[str, str | int | float]
@@ -146,33 +119,6 @@ class CheckpointTuple(NamedTuple):
    pending_writes: list[PendingWrite] | None = None


-class DeltaChannelHistory(TypedDict):
-    """Per-channel result entry from `BaseCheckpointSaver.get_delta_channel_history`.
-
-    !!! warning "Beta"
-
-        Part of the `DeltaChannel` support surface; in beta. Field names and
-        semantics may change.
-
-    Storage-level view of what one channel contributed across the ancestor
-    chain of a target checkpoint:
-
-    * `writes` — on-path deltas oldest→newest as `PendingWrite` tuples.
-      Always present; possibly empty. Already filtered to one channel.
-      Writes stored at the target checkpoint itself are pending for the
-      next super-step and are excluded.
-    * `seed` — the stored value at the nearest ancestor whose
-      `channel_values[ch]` is populated. Omitted if the walk reached the
-      root without finding any stored value (consumer treats absence as
-      "start empty"). Typically a `_DeltaSnapshot` for delta channels with
-      finite snapshot frequency, or a plain value for threads migrated
-      from a pre-delta channel type.
-    """
-
-    writes: list[PendingWrite]
-    seed: NotRequired[Any]
-
-
 class BaseCheckpointSaver(Generic[V]):
    """Base class for creating a graph checkpointer.

@@ -336,14 +282,6 @@ class BaseCheckpointSaver(Generic[V]):

        Args:
            run_ids: The run IDs whose checkpoints should be deleted.
-
-        !!! warning "DeltaChannel"
-
-            Deleting a run that produced ancestor `checkpoint_writes` — or
-            the only `_DeltaSnapshot` blob — for a still-live thread will
-            break reconstruction of any `DeltaChannel` whose history
-            depended on those rows. See the `DeltaChannel` note on `prune`
-            for safe-recovery strategies.
        """
        raise NotImplementedError

@@ -357,17 +295,6 @@ class BaseCheckpointSaver(Generic[V]):
        Args:
            source_thread_id: The thread ID to copy from.
            target_thread_id: The thread ID to copy to.
-
-        !!! warning "DeltaChannel"
-
-            Implementations must copy the **complete** parent chain (all
-            ancestor checkpoints and their `checkpoint_writes`) — copying
-            only the head checkpoint will leave the target thread with
-            `DeltaChannel` state that cannot be reconstructed (no path back
-            to a `_DeltaSnapshot` ancestor). Equivalently, the copy must
-            include enough ancestors that every `DeltaChannel`-backed key
-            has either a `_DeltaSnapshot` in `channel_values` somewhere in
-            the chain, or a complete write history back to the chain root.
        """
        raise NotImplementedError

@@ -383,34 +310,6 @@ class BaseCheckpointSaver(Generic[V]):
            thread_ids: The thread IDs to prune.
            strategy: The pruning strategy. `"keep_latest"` retains only the most
                recent checkpoint per namespace. `"delete"` removes all checkpoints.
-
-        !!! warning "DeltaChannel"
-
-            Custom implementations must be `DeltaChannel`-aware. `DeltaChannel`
-            stores only a sentinel in `channel_values` for non-snapshot steps;
-            reconstruction walks the parent chain via
-            `get_delta_channel_history`, accumulating rows from
-            `checkpoint_writes` until it reaches an ancestor whose
-            `channel_values` contains a `_DeltaSnapshot` blob (written every
-            `snapshot_frequency` updates).
-
-            A naive `"keep_latest"` that drops intermediate checkpoints and
-            their writes can sever that chain: the surviving "latest"
-            checkpoint is rarely a snapshot point itself, so its delta
-            channels would silently reconstruct as empty (no error raised —
-            `get_delta_channel_history` simply returns no `seed`). Safe
-            options when the graph uses `DeltaChannel`:
-
-            * Walk back from each kept checkpoint and preserve every
-              ancestor (plus its `checkpoint_writes`) up to the nearest one
-              whose `channel_values` already contains a `_DeltaSnapshot` for
-              every `DeltaChannel`-backed key.
-            * Force a fresh snapshot on the kept checkpoint before deleting
-              ancestors — rewrite `channel_values[k] = _DeltaSnapshot(value)`
-              for each delta channel `k` (resolving `value` via the existing
-              ancestor walk first), then prune.
-            * Skip pruning threads whose graph uses `DeltaChannel` until one
-              of the above is implemented.
        """
        raise NotImplementedError

@@ -527,13 +426,6 @@ class BaseCheckpointSaver(Generic[V]):

        Args:
            run_ids: The run IDs whose checkpoints should be deleted.
-
-        !!! warning "DeltaChannel"
-
-            See `delete_for_runs` — deleting rows a still-live thread's
-            `DeltaChannel` reconstruction depends on (writes between the
-            head and its nearest `_DeltaSnapshot` ancestor) will silently
-            corrupt that channel's state.
        """
        raise NotImplementedError

@@ -547,13 +439,6 @@ class BaseCheckpointSaver(Generic[V]):
        Args:
            source_thread_id: The thread ID to copy from.
            target_thread_id: The thread ID to copy to.
-
-        !!! warning "DeltaChannel"
-
-            See `copy_thread` — the copy must carry the complete parent
-            chain (or at least back to a `_DeltaSnapshot` ancestor for every
-            `DeltaChannel`) so the target thread can reconstruct delta
-            state.
        """
        raise NotImplementedError

@@ -569,126 +454,9 @@ class BaseCheckpointSaver(Generic[V]):
            thread_ids: The thread IDs to prune.
            strategy: The pruning strategy. `"keep_latest"` retains only the most
                recent checkpoint per namespace. `"delete"` removes all checkpoints.
-
-        !!! warning "DeltaChannel"
-
-            See `prune` for the full `DeltaChannel` caveat. In short:
-            `"keep_latest"` must not drop ancestor checkpoints / writes that
-            sit between the kept checkpoint and the nearest `_DeltaSnapshot`
-            ancestor, or delta channels will silently reconstruct as empty.
        """
        raise NotImplementedError

-    def get_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Walk the parent chain returning per-channel writes + seed.
-
-        !!! warning "Beta"
-
-            This method is part of the `DeltaChannel` support surface and is
-            in beta. The signature, return shape (`DeltaChannelHistory`), and
-            interaction with `_DeltaSnapshot` blobs may change. Override at
-            your own risk; the default implementation will continue to work
-            against the public `BaseCheckpointSaver` contract.
-
-        For each requested channel, walks ancestors of the checkpoint
-        identified by `config` (following `parent_config`) and accumulates
-        `pending_writes` for that channel. The walk terminates per-channel
-        at the nearest ancestor whose `channel_values[ch]` is populated;
-        that value is returned as `seed`. If the walk reaches the root
-        without finding a stored value, `seed` is omitted from that
-        channel's entry — the consumer treats the absence as "start
-        empty."
-
-        Walks the **parent chain** (not `list(before=...)`): for forked
-        threads, only on-path ancestors contribute.
-
-        The default implementation walks `get_tuple` + `parent_config`
-        once for all channels — each ancestor visited once, not once per
-        channel. Savers with direct storage access (`InMemorySaver`,
-        `PostgresSaver`) override for performance; the return contract is
-        fixed here.
-
-        Args:
-            config: Configuration identifying the target checkpoint.
-            channels: Channel names to walk for. Empty → empty mapping.
-
-        Returns:
-            Per-channel `DeltaChannelHistory` for every name in `channels`.
-        """
-        if not channels:
-            return {}
-        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
-        seed_by_ch: dict[str, Any] = {}
-        remaining: set[str] = set(channels)
-        target_tuple = self.get_tuple(config)
-        cursor_config: RunnableConfig | None = (
-            target_tuple.parent_config if target_tuple else None
-        )
-        while cursor_config is not None and remaining:
-            tup = self.get_tuple(cursor_config)
-            if tup is None:
-                break
-            if tup.pending_writes:
-                for write in reversed(tup.pending_writes):
-                    ch = write[1]
-                    if ch in remaining:
-                        collected_by_ch[ch].append(write)
-            for ch in list(remaining):
-                if ch in tup.checkpoint["channel_values"]:
-                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
-                    remaining.discard(ch)
-            cursor_config = tup.parent_config
-        result: dict[str, DeltaChannelHistory] = {}
-        for ch in channels:
-            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
-            if ch in seed_by_ch:
-                entry["seed"] = seed_by_ch[ch]
-            result[ch] = entry
-        return result
-
-    async def aget_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Async version of `get_delta_channel_history`.
-
-        !!! warning "Beta"
-
-            This method is part of the `DeltaChannel` support surface and is
-            in beta. See `get_delta_channel_history` for caveats.
-        """
-        if not channels:
-            return {}
-        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
-        seed_by_ch: dict[str, Any] = {}
-        remaining: set[str] = set(channels)
-        target_tuple = await self.aget_tuple(config)
-        cursor_config: RunnableConfig | None = (
-            target_tuple.parent_config if target_tuple else None
-        )
-        while cursor_config is not None and remaining:
-            tup = await self.aget_tuple(cursor_config)
-            if tup is None:
-                break
-            if tup.pending_writes:
-                for write in reversed(tup.pending_writes):
-                    ch = write[1]
-                    if ch in remaining:
-                        collected_by_ch[ch].append(write)
-            for ch in list(remaining):
-                if ch in tup.checkpoint["channel_values"]:
-                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
-                    remaining.discard(ch)
-            cursor_config = tup.parent_config
-        result: dict[str, DeltaChannelHistory] = {}
-        for ch in channels:
-            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
-            if ch in seed_by_ch:
-                entry["seed"] = seed_by_ch[ch]
-            result[ch] = entry
-        return result
-
    def get_next_version(self, current: V | None, channel: None) -> V:
        """Generate the next version ID for a channel.

@@ -6,7 +6,7 @@ import pickle
 import random
 import shutil
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import AbstractAsyncContextManager, AbstractContextManager, ExitStack
 from types import TracebackType
 from typing import Any
@@ -20,8 +20,6 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
-    PendingWrite,
    SerializerProtocol,
    get_checkpoint_id,
    get_checkpoint_metadata,
@@ -123,109 +121,16 @@ 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]:
-        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_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Override: walk the parent chain ONCE for all requested channels.
-
-        Each channel terminates independently at the nearest ancestor
-        whose stored blob is non-empty. Other channels keep walking until
-        they find their own terminator or hit the root.
-
-        A blob is the value AT its ancestor, prior to the writes stored
-        under that same ancestor (those writes produce its child, which
-        is on the path to the target). This holds for `_DeltaSnapshot`
-        blobs and for pre-delta plain values alike, so the seed
-        ancestor's own writes are always collected. Writes at ancestors
-        older than the seed are subsumed by the seed value and are never
-        reached — the walk terminates there.
-        """
-        if not channels:
-            return {}
-        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, {})
-
-        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
-
-        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
-        seed_by_ch: dict[str, Any] = {}
-        remaining: set[str] = set(channels)
-
-        for cp_id in chain:
-            if not remaining:
-                break
-            entry = ns_storage.get(cp_id)
-            ckpt = self.serde.loads_typed(entry[0]) if entry is not None else None
-
-            terminated_here: set[str] = set()
-            blob_value_by_ch: dict[str, Any] = {}
-            if ckpt is not None:
-                versions = ckpt.get("channel_versions", {})
-                for ch in remaining:
-                    ver = versions.get(ch)
-                    if ver is None:
-                        continue
-                    blob_entry = self.blobs.get((thread_id, checkpoint_ns, ch, ver))
-                    if blob_entry is None or blob_entry[0] == "empty":
-                        continue
-                    blob_value_by_ch[ch] = self.serde.loads_typed(blob_entry)
-                    terminated_here.add(ch)
-
-            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 not in remaining:
-                    continue
-                collected_by_ch[ch].append(
-                    (tid, ch, self.serde.loads_typed(serialized))
-                )
-
-            for ch in terminated_here:
-                seed_by_ch[ch] = blob_value_by_ch[ch]
-                remaining.discard(ch)
-
-        result: dict[str, DeltaChannelHistory] = {}
-        for ch in channels:
-            entry_h: DeltaChannelHistory = {
-                "writes": list(reversed(collected_by_ch[ch]))
-            }
-            if ch in seed_by_ch:
-                entry_h["seed"] = seed_by_ch[ch]
-            result[ch] = entry_h
-        return result
-
-    async def aget_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        return self.get_delta_channel_history(config=config, channels=channels)
+        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

    def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
        """Get a checkpoint tuple from the in-memory storage.
@@ -1,10 +1,3 @@
-"""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
@@ -73,7 +66,6 @@ SAFE_MSGPACK_TYPES: frozenset[tuple[str, ...]] = frozenset(
        ("langchain_core.documents.base", "Document"),
        # langgraph
        ("langgraph.types", "Send"),
-        ("langgraph.types", "TimeoutPolicy"),
        ("langgraph.types", "Interrupt"),
        ("langgraph.types", "Command"),
        ("langgraph.types", "StateSnapshot"),
@@ -33,51 +33,19 @@ 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,
-    _DeltaSnapshot,
-)
+from langgraph.checkpoint.serde.types import SendProtocol
 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(allowed_objects="core")
+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 _is_safe_json_type(id_list: list[str]) -> bool:
-    """Return True if an lc=2 id refers to a type in SAFE_MSGPACK_TYPES.
-
-    Safe types bypass the ``allowed_json_modules`` gate so that old "json" format
-    checkpoints (written before the msgpack migration) can be resumed without
-    requiring users to configure an explicit allowlist.
-    """
-    if len(id_list) < 2:
-        return False
-    module_name = ".".join(id_list[:-1])
-    return (module_name, id_list[-1]) in _lg_msgpack.SAFE_MSGPACK_TYPES
-
-
-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.
@@ -88,10 +56,6 @@ 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__(
@@ -106,11 +70,8 @@ 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 = (
@@ -157,24 +118,41 @@ class JsonPlusSerializer(SerializerProtocol):
            )
        return clone

+    def _encode_constructor_args(
+        self,
+        constructor: Callable | type[Any],
+        *,
+        method: None | str | Sequence[None | str] = None,
+        args: Sequence[Any] | None = None,
+        kwargs: dict[str, Any] | None = None,
+    ) -> dict[str, Any]:
+        out = {
+            "lc": 2,
+            "type": "constructor",
+            "id": (*constructor.__module__.split("."), constructor.__name__),
+        }
+        if method is not None:
+            out["method"] = method
+        if args is not None:
+            out["args"] = args
+        if kwargs is not None:
+            out["kwargs"] = kwargs
+        return out
+
    def _reviver(self, value: dict[str, Any]) -> Any:
-        if (
+        if self._allowed_json_modules and (
            value.get("lc", None) == 2
            and value.get("type", None) == "constructor"
            and value.get("id", None) is not None
        ):
-            id_list = value["id"]
-            is_safe = _is_safe_json_type(id_list)
-            if self._allowed_json_modules or is_safe:
-                try:
-                    return self._revive_lc2(value)
-                except InvalidModuleError as e:
-                    if not is_safe:
-                        logger.warning(
-                            "Object %s is not in the deserialization allowlist.\n%s",
-                            value["id"],
-                            e.message,
-                        )
+            try:
+                return self._revive_lc2(value)
+            except InvalidModuleError as e:
+                logger.warning(
+                    "Object %s is not in the deserialization allowlist.\n%s",
+                    value["id"],
+                    e.message,
+                )

        return LC_REVIVER(value)

@@ -182,57 +160,49 @@ class JsonPlusSerializer(SerializerProtocol):
        self._check_allowed_json_modules(value)

        [*module, name] = value["id"]
-        # The `method` field on lc:2 envelopes is intentionally ignored.
-        # Revival is restricted to the default constructor (no `getattr`
-        # dispatch on attacker-influenced names). The framework's own
-        # encoder has not emitted `method=` since the msgpack migration,
-        # and the only legacy emission was `method=(None, "construct")`
-        # for pydantic models, where the first entry (`None`) already
-        # meant "default constructor", which is what we do here.
        try:
            mod = importlib.import_module(".".join(module))
            cls = getattr(mod, name)
-            if isclass(cls) and issubclass(cls, BaseException):
-                return None
+            method = value.get("method")
+            if isinstance(method, str):
+                methods = [getattr(cls, method)]
+            elif isinstance(method, list):
+                methods = [cls if m is None else getattr(cls, m) for m in method]
+            else:
+                methods = [cls]
            args = value.get("args")
            kwargs = value.get("kwargs")
-            if args and kwargs:
-                return cls(*args, **kwargs)
-            elif args:
-                return cls(*args)
-            elif kwargs:
-                return cls(**kwargs)
-            else:
-                return cls()
-        except Exception as exc:
-            # Method-field dispatch has been removed (GHSA-fjqc-hq36-qh5p), so
-            # legacy pydantic payloads emitting `method=[None, "construct"]`
-            # no longer fall back to `cls.construct(**kwargs)` when the
-            # default constructor rejects the serialized kwargs. Surface a
-            # one-line warning so operators can spot payloads that now revive
-            # to `None` instead of silently degrading to the raw envelope.
-            logger.warning(
-                "Failed to revive lc:2 envelope %s "
-                "(legacy_method_field=%s, error=%s); returning None",
-                ".".join((*module, name)),
-                "method" in value,
-                type(exc).__name__,
-            )
+            for method in methods:
+                try:
+                    if isclass(method) and issubclass(method, BaseException):
+                        return None
+                    if args and kwargs:
+                        return method(*args, **kwargs)
+                    elif args:
+                        return method(*args)
+                    elif kwargs:
+                        return method(**kwargs)
+                    else:
+                        return method()
+                except Exception:
+                    continue
+        except Exception:
            return None

    def _check_allowed_json_modules(self, value: dict[str, Any]) -> None:
        needed = tuple(value["id"])
-        dotted = ".".join(needed)
-        # Safe types (the same set already allowed for msgpack deserialization) are
-        # permitted without an explicit allowlist — they are known-safe LangGraph and
-        # LangChain types.  This restores backwards-compat for old "json" checkpoints
-        # that pre-date the msgpack migration without reopening the broader security gate.
-        if _is_safe_json_type(list(needed)):
-            return
+        method = value.get("method")
+        if isinstance(method, list):
+            method_display = ",".join(m or "<init>" for m in method)
+        elif isinstance(method, str):
+            method_display = method
+        else:
+            method_display = "<init>"

+        dotted = ".".join(needed)
        if not self._allowed_json_modules:
            raise InvalidModuleError(
-                f"Refused to deserialize JSON constructor: {dotted}. "
+                f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
                "No allowed_json_modules configured.\n\n"
                "Unblock with ONE of:\n"
                f"  • JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -247,7 +217,7 @@ class JsonPlusSerializer(SerializerProtocol):
            return

        raise InvalidModuleError(
-            f"Refused to deserialize JSON constructor: {dotted}. "
+            f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
            "Symbol is not in the deserialization allowlist.\n\n"
            "Add exactly this symbol to unblock:\n"
            f"  JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -299,13 +269,10 @@ EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
 EXT_NUMPY_ARRAY = 6
-EXT_DELTA_SNAPSHOT = 7


 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
-    if isinstance(obj, _DeltaSnapshot):
-        return ormsgpack.Ext(EXT_DELTA_SNAPSHOT, _msgpack_enc(obj.value))
-    elif hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
+    if hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
        return ormsgpack.Ext(
            EXT_PYDANTIC_V2,
            _msgpack_enc(
@@ -477,13 +444,10 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
            ),
        )
    elif isinstance(obj, SendProtocol):
-        args: tuple[Any, ...] = (obj.node, obj.arg)
-        if (timeout := getattr(obj, "timeout", None)) is not None:
-            args = (obj.node, obj.arg, timeout)
        return ormsgpack.Ext(
            EXT_CONSTRUCTOR_POS_ARGS,
            _msgpack_enc(
-                (obj.__class__.__module__, obj.__class__.__name__, args),
+                (obj.__class__.__module__, obj.__class__.__name__, (obj.node, obj.arg)),
            ),
        )
    elif dataclasses.is_dataclass(obj):
@@ -534,15 +498,6 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
        raise TypeError(f"Object of type {obj.__class__.__name__} is not serializable")


-def _send_from_args(args: Sequence[Any]) -> Any:
-    # ya we have a cyclic import here ¯\_(ツ)_/¯
-    from langgraph.types import Send  # type: ignore
-
-    if len(args) == 2:
-        return Send(*args)
-    return Send(args[0], args[1], timeout=args[2])
-
-
 def _create_msgpack_ext_hook(
    allowed_modules: set[tuple[str, ...]] | Literal[True] | None,
 ) -> Callable[[int, bytes], Any]:
@@ -572,13 +527,10 @@ def _create_msgpack_ext_hook(
                    "name": name,
                }
            )
-            _warn_once(
-                _warned_unregistered_types,
-                key,
+            logger.warning(
                "Deserializing unregistered type %s.%s from checkpoint. "
                "This will be blocked in a future version. "
-                "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
-                "to allowed_msgpack_modules to allow explicitly: [(%r, %r)]",
+                "Add to allowed_msgpack_modules to silence: [(%r, %r)]",
                module,
                name,
                module,
@@ -596,9 +548,7 @@ def _create_msgpack_ext_hook(
                "name": name,
            }
        )
-        _warn_once(
-            _warned_blocked_types,
-            key,
+        logger.warning(
            "Blocked deserialization of %s.%s - not in allowed_msgpack_modules. "
            "Add to allowed_msgpack_modules to allow: [(%r, %r)]",
            module,
@@ -631,13 +581,7 @@ def _create_msgpack_ext_hook(
        return False

    def ext_hook(code: int, data: bytes) -> Any:
-        if 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:
+        if code == EXT_CONSTRUCTOR_SINGLE_ARG:
            try:
                tup = ormsgpack.unpackb(
                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
@@ -658,8 +602,6 @@ def _create_msgpack_ext_hook(
                )
                if not _check_allowed(tup[0], tup[1]):
                    return tup[2]
-                if tup[0] == "langgraph.types" and tup[1] == "Send":
-                    return _send_from_args(tup[2])
                # module, name, args
                return getattr(importlib.import_module(tup[0]), tup[1])(*tup[2])
            except Exception:
@@ -773,7 +715,9 @@ def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
                option=ormsgpack.OPT_NON_STR_KEYS,
            )
            if tup[0] == "langgraph.types" and tup[1] == "Send":
-                return _send_from_args(tup[2])
+                from langgraph.types import Send  # type: ignore
+
+                return Send(*tup[2])
            # module, name, args
            return tup[2]
        except Exception:
@@ -1,7 +1,6 @@
 from collections.abc import Sequence
 from typing import (
    Any,
-    NamedTuple,
    Protocol,
    TypeVar,
    runtime_checkable,
@@ -15,22 +14,6 @@ INTERRUPT = "__interrupt__"
 RESUME = "__resume__"
 TASKS = "__pregel_tasks"

-
-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 `BaseCheckpointSaver.get_delta_channel_history` terminates
-    when it encounters this type (any non-empty channel_values entry stops
-    the walk for that channel).
-
-    `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")
@@ -552,14 +552,6 @@ class TTLConfig(TypedDict, total=False):
    This can be overridden per-operation by explicitly setting `refresh_ttl`.
    Defaults to `True` if not configured.
    """
-    omit_expired: bool
-    """Whether to omit expired items from read operations.
-
-    If `True`, and if the store supports this option, expired items will not be
-    returned by `GET` or `SEARCH`, or included in namespace listings, even before
-    a TTL sweep deletes them.
-    Defaults to `False` if not configured.
-    """
    default_ttl: float | None
    """Default TTL (time-to-live) in minutes for new items.
    
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.0.1"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -18,7 +18,7 @@ dependencies = [

 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint"
-Twitter = "https://x.com/langchain_oss"
+Twitter = "https://x.com/LangChain"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"

@@ -37,7 +37,7 @@ test = [
 lint = [
  "ruff",
  "codespell",
-  "ty",
+  "mypy",
 ]
 dev = [
  {include-group = "test"},
@@ -59,33 +59,23 @@ lint.select = [
  "UP", # pyupgrade
  "B",  # flake8-bugbear
  "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
  "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"

-[tool.ty.rules]
-deprecated = "ignore"
-invalid-argument-type = "ignore"
-invalid-assignment = "ignore"
-invalid-key = "ignore"
-invalid-method-override = "ignore"
-invalid-return-type = "ignore"
-invalid-type-form = "ignore"
-redundant-cast = "ignore"
-unused-type-ignore-comment = "ignore"
-unresolved-attribute = "ignore"
-unresolved-import = "ignore"
-unsupported-operator = "ignore"
-
 [tool.pytest-watcher]
 now = true
 delay = 0.1
 runner_args = ["--ff", "-v", "--tb", "short"]
 patterns = ["*.py"]
+
+[tool.mypy]
+# https://mypy.readthedocs.io/en/stable/config_file.html
+disallow_untyped_defs = "True"
+explicit_package_bases = "True"
+warn_no_return = "False"
+warn_unused_ignores = "True"
+warn_redundant_casts = "True"
+allow_redefinition = "True"
+disable_error_code = "typeddict-item, return-value"
@@ -1,37 +0,0 @@
-"""Run delta-channel conformance capabilities against InMemorySaver."""
-
-from __future__ import annotations
-
-import pytest
-
-conformance = pytest.importorskip(
-    "langgraph.checkpoint.conformance",
-    reason="langgraph-checkpoint-conformance not installed",
-)
-
-
-@pytest.mark.asyncio
-async def test_delta_channel_conformance():
-    # Imported inside the test: the module-level importorskip above is what
-    # makes these safe, so they cannot move to the top of the file.
-    from langgraph.checkpoint.conformance import validate  # noqa: PLC0415
-    from langgraph.checkpoint.conformance.initializer import (  # noqa: PLC0415
-        checkpointer_test,
-    )
-
-    from langgraph.checkpoint.memory import InMemorySaver  # noqa: PLC0415
-
-    @checkpointer_test(name="InMemorySaver")
-    async def mem_saver():
-        yield InMemorySaver()
-
-    report = await validate(
-        mem_saver,
-        capabilities={
-            "delta_channel_history",
-        },
-    )
-    for cap, result in report.results.items():
-        if result.passed is False:
-            details = "\n".join(result.failures or [])
-            pytest.fail(f"Capability {cap} failed:\n{details}")
@@ -29,8 +29,6 @@ from langgraph.checkpoint.serde.jsonplus import (
    EXT_METHOD_SINGLE_ARG,
    JsonPlusSerializer,
    _msgpack_enc,
-    _warned_blocked_types,
-    _warned_unregistered_types,
 )


@@ -104,13 +102,6 @@ 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()
@@ -307,6 +298,8 @@ class TestWithMsgpackAllowlistEncrypted:
            def loads_typed(self, data: tuple[str, bytes]) -> None:
                return None

+        from langgraph.checkpoint.serde.base import CipherProtocol
+
        class DummyCipher(CipherProtocol):
            def encrypt(self, plaintext: bytes) -> tuple[str, bytes]:
                return "dummy", plaintext
@@ -1,12 +1,9 @@
 import dataclasses
 import json
 import logging
-import os
 import pathlib
-import pickle
 import re
 import sys
-import tempfile
 import uuid
 from collections import deque
 from datetime import date, datetime, time, timezone
@@ -21,7 +18,7 @@ import ormsgpack
 import pandas as pd
 import pytest
 from langchain_core.documents.base import Document
-from langchain_core.messages import AIMessage, HumanMessage
+from langchain_core.messages import HumanMessage
 from pydantic import BaseModel, SecretStr
 from pydantic.v1 import BaseModel as BaseModelV1
 from pydantic.v1 import SecretStr as SecretStrV1
@@ -38,8 +35,6 @@ 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

@@ -336,56 +331,6 @@ def test_serde_jsonplus_bytes() -> None:
    assert serde.loads_typed(dumped) == some_bytes


-def test_lc2_json_safe_type_revives_without_allowlist() -> None:
-    """Old 'json' blobs with lc=2 for safe types must revive without an explicit allowlist.
-
-    Regression test for: https://github.com/langchain-ai/langgraph/issues/7498
-    Threads checkpointed before v1.0.1 (pre-msgpack) stored messages as lc=2 JSON
-    constructor dicts. Resuming those threads must reconstruct proper BaseMessage objects
-    rather than returning raw dicts that cause MESSAGE_COERCION_FAILURE in add_messages.
-    """
-
-    serde = JsonPlusSerializer()  # default: _allowed_json_modules=None
-
-    human_blob = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "human", "HumanMessage"],
-        "kwargs": {"content": "hello", "type": "human"},
-    }
-    ai_blob = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "kwargs": {"content": "hi there", "type": "ai"},
-    }
-    result = serde.loads_typed(("json", json.dumps([human_blob, ai_blob]).encode()))
-
-    assert len(result) == 2
-    assert isinstance(result[0], HumanMessage), (
-        f"Expected HumanMessage, got {type(result[0])}: {result[0]!r}\n"
-        "lc=2 JSON blobs for safe types must deserialize without an explicit allowlist"
-    )
-    assert result[0].content == "hello"
-    assert isinstance(result[1], AIMessage)
-    assert result[1].content == "hi there"
-
-
-def test_lc2_json_unknown_type_stays_blocked_without_allowlist() -> None:
-    """lc=2 JSON blobs for types NOT in SAFE_MSGPACK_TYPES still require an allowlist."""
-    serde = JsonPlusSerializer()
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["pprint", "pprint"],
-        "kwargs": {"object": "HELLO"},
-    }
-    # No allowlist configured → raw dict returned (not raised, not reconstructed)
-    result = serde.loads_typed(("json", json.dumps(load).encode()))
-    assert isinstance(result, dict), "Unknown lc=2 type must stay as raw dict"
-    assert result.get("lc") == 2
-
-
 def test_deserde_invalid_module() -> None:
    serde = JsonPlusSerializer()
    load = {
@@ -400,186 +345,6 @@ def test_deserde_invalid_module() -> None:
    serde.loads_typed(("json", json.dumps(load).encode("utf-8")))


-def test_lc2_json_method_field_is_ignored() -> None:
-    """The `method` field on lc=2 envelopes is ignored.
-
-    Regression test for GHSA-fjqc-hq36-qh5p: `_revive_lc2` previously resolved
-    `getattr(cls, method)` from the envelope, which let an attacker pivot a
-    safe pydantic class (e.g., AIMessage) to `parse_raw(..., allow_pickle=True)`
-    and reach `pickle.loads`. Revival now uses only the default constructor.
-
-    Verifies that an envelope carrying ``method="parse_raw"`` does not dispatch
-    to that method: the result is whatever ``AIMessage(*args, **kwargs)`` would
-    produce, which proves the default constructor ran instead of ``parse_raw``.
-    """
-
-    serde = JsonPlusSerializer()
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "method": "parse_raw",
-        "args": ["default-ctor-ran"],
-        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
-    }
-    result = serde._revive_lc2(load)
-    # Default constructor accepts `content` as first positional arg. If parse_raw
-    # had been invoked instead, it would have attempted JSON/pickle parsing and
-    # raised (or executed the pickle gadget); neither would produce this result.
-    assert isinstance(result, AIMessage)
-    assert result.content == "default-ctor-ran"
-
-
-def test_lc2_json_method_field_is_ignored_for_allowlisted_types() -> None:
-    """The `method` field is ignored even when the class is explicitly allowlisted.
-
-    A user who configures ``allowed_json_modules`` for a class no longer gets
-    method dispatch as a side effect. Revival is restricted to the default
-    constructor regardless of how the class reached the revival path.
-    """
-
-    serde = JsonPlusSerializer(
-        allowed_json_modules=[("langchain_core.messages.ai", "AIMessage")]
-    )
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "method": "parse_raw",
-        "args": ["default-ctor-ran"],
-    }
-    result = serde._revive_lc2(load)
-    assert isinstance(result, AIMessage)
-    assert result.content == "default-ctor-ran"
-
-
-def test_lc2_json_safe_type_init_still_works() -> None:
-    """SAFE-type lc=2 revival without a `method` field still constructs the class."""
-
-    serde = JsonPlusSerializer()
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "kwargs": {"content": "hi", "type": "ai"},
-    }
-    result = serde._revive_lc2(load)
-    assert isinstance(result, AIMessage)
-    assert result.content == "hi"
-
-
-def test_lc2_json_legacy_pydantic_method_list_falls_back_to_default() -> None:
-    """Legacy ``method=(None, "construct")`` envelopes still revive via the default ctor.
-
-    Pre-October-2025 langgraph emitted pydantic models with
-    ``method=(None, "construct")`` meaning "try default constructor, fall back
-    to pydantic ``construct``". The first entry (``None``) was always the
-    default constructor, which is what we now do unconditionally. Envelopes of
-    this shape continue to revive correctly as long as the default constructor
-    accepts the serialized kwargs.
-    """
-
-    serde = JsonPlusSerializer()
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "method": [None, "construct"],
-        "kwargs": {"content": "legacy", "type": "ai"},
-    }
-    result = serde._revive_lc2(load)
-    assert isinstance(result, AIMessage)
-    assert result.content == "legacy"
-
-
-def test_lc2_json_legacy_construct_payload_logs_warning_when_default_init_rejects(
-    caplog: pytest.LogCaptureFixture,
-) -> None:
-    """Legacy `method=[None, "construct"]` envelopes whose kwargs the default
-    `__init__` rejects now revive to `None` and emit an observable warning.
-
-    Pre-October-2025 langgraph emitted pydantic payloads with
-    `method=[None, "construct"]` so the reviver could fall back to
-    `cls.construct(**kwargs)` when the default constructor raised a
-    validation error. That fallback was removed with method-field dispatch
-    (GHSA-fjqc-hq36-qh5p), so these payloads now silently fail validation. A
-    `logger.warning` makes the regression observable to operators instead of
-    letting the envelope quietly degrade to its raw-dict form.
-    """
-    serde = JsonPlusSerializer()
-    load = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        # Legacy two-entry method tuple: try default ctor, fall back to construct.
-        "method": [None, "construct"],
-        # ``type="not-a-real-message-type"`` fails AIMessage's Literal["ai"]
-        # validator under the default constructor. Before the GHSA patch this
-        # would have fallen back to ``cls.construct(**kwargs)``; now it must
-        # return None and log.
-        "kwargs": {"content": "legacy", "type": "not-a-real-message-type"},
-    }
-
-    with caplog.at_level(logging.WARNING, logger="langgraph.checkpoint.serde.jsonplus"):
-        result = serde._revive_lc2(load)
-
-    assert result is None, (
-        "Legacy method=[None, 'construct'] payloads with kwargs the default "
-        "ctor rejects must now return None (no construct() fallback)."
-    )
-
-    matching = [
-        r
-        for r in caplog.records
-        if r.name == "langgraph.checkpoint.serde.jsonplus"
-        and r.levelno == logging.WARNING
-        and "langchain_core.messages.ai.AIMessage" in r.getMessage()
-        and "legacy_method_field=True" in r.getMessage()
-    ]
-    assert matching, (
-        "Expected a WARNING from langgraph.checkpoint.serde.jsonplus "
-        "referencing the class id and legacy_method_field=True; "
-        f"got records: {[(r.name, r.levelname, r.getMessage()) for r in caplog.records]}"
-    )
-
-
-def test_lc2_json_safe_type_pickle_payload_does_not_execute() -> None:
-    """End-to-end: a `parse_raw` pickle gadget payload on a SAFE type must not run.
-
-    With method dispatch removed from `_revive_lc2`, the gadget bytes are never
-    passed to `parse_raw` and therefore never reach `pickle.loads`.
-    """
-
-    marker = tempfile.NamedTemporaryFile(
-        prefix="lc2_block_proof_", suffix=".out", delete=False
-    ).name
-    os.remove(marker)  # ensure absent before the test runs
-
-    class _Gadget:
-        def __reduce__(self) -> tuple:
-            return (os.system, (f"touch {marker}",))
-
-    gadget_bytes = pickle.dumps(_Gadget(), protocol=0).decode("latin1")
-    envelope = {
-        "lc": 2,
-        "type": "constructor",
-        "id": ["langchain_core", "messages", "ai", "AIMessage"],
-        "method": "parse_raw",
-        "args": [gadget_bytes],
-        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
-    }
-
-    serde = JsonPlusSerializer()
-    try:
-        serde.loads_typed(("json", json.dumps(envelope).encode()))
-    except Exception:
-        pass
-
-    assert not os.path.exists(marker), (
-        "Pickle gadget executed via parse_raw on AIMessage lc=2 envelope"
-    )
-
-
 def test_serde_jsonplus_bytearray() -> None:
    serde = JsonPlusSerializer()

@@ -815,14 +580,6 @@ 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
@@ -838,12 +595,6 @@ 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


@@ -888,6 +639,7 @@ 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"))
@@ -905,6 +657,7 @@ 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")]
    )
@@ -1,4 +1,3 @@
-import asyncio
 import logging
 from typing import Any

@@ -13,25 +12,13 @@ from langgraph.checkpoint.base import (
    empty_checkpoint,
 )
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.checkpoint.serde.jsonplus import (
-    JsonPlusSerializer,
-    _warned_blocked_types,
-    _warned_unregistered_types,
-)
+from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer


 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:
@@ -209,6 +196,8 @@ class TestMemorySaver:


 async def test_memory_saver() -> None:
+    from langgraph.checkpoint.memory import InMemorySaver
+
    memory_saver = InMemorySaver()
    assert isinstance(memory_saver, InMemorySaver)

@@ -319,391 +308,3 @@ 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_omits_delta_channel(self) -> None:
-        """_load_blobs omits delta channels (stored as 'empty'); reconstruction deferred."""
-        saver = InMemorySaver()
-
-        thread_id, ns, channel = "t1", "", "messages"
-        v1 = "00000000000000000000000000000001.0000000000000000"
-
-        saver.blobs[(thread_id, ns, channel, v1)] = ("empty", b"")
-
-        result = saver._load_blobs(thread_id, ns, {channel: v1})
-        assert channel not in result
-
-    def test_get_channel_writes_collects_ancestor_writes_only(self) -> None:
-        """`get_delta_channel_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).
-
-        When the walk reaches the root without finding any stored value for
-        the channel, the per-channel entry has no `seed` key (TypedDict
-        absence indicates "start empty").
-        """
-        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_delta_channel_history(config=config, channels=[channel])[
-            channel
-        ]
-        # Walk reached the root without finding a stored value → no `seed` key.
-        assert "seed" not in result
-        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_delta_channel_history(config=config, channels=[channel])[
-            channel
-        ]
-        # No ancestors → no seed found, no writes accumulated.
-        assert "seed" not in result
-        assert result["writes"] == []
-
-
-class TestBaseFallbackGetChannelWrites:
-    """Exercises the `BaseCheckpointSaver.get_delta_channel_history` default
-    implementation — the path third-party savers inherit when they don't
-    override `get_delta_channel_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_delta_channel_history = (
-                InMemorySaver.__mro__[1].get_delta_channel_history  # type: ignore[attr-defined]
-            )
-            aget_delta_channel_history = (
-                InMemorySaver.__mro__[1].aget_delta_channel_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_delta_channel_history(config=config, channels=["messages"])[
-            "messages"
-        ]
-
-        # Walk reached root without a stored value → `seed` key absent.
-        assert "seed" not in result
-        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_delta_channel_history(config=config, channels=["messages"])
-        )["messages"]
-
-        assert "seed" not in result
-        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_delta_channel_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=[]`.
-        """
-
-        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_delta_channel_history(config=config, channels=["messages"]),
-            saver.aget_delta_channel_history(config=config, channels=["messages"]),
-        )
-
-        expected_values = [{"content": "first"}, {"content": "second"}]
-        for result_map in results:
-            result = result_map["messages"]
-            assert "seed" not in result
-            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, 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.
-
-    Under the new public API a found seed populates `seed` in the
-    `DeltaChannelHistory` TypedDict; absence of the `seed` key means the walk
-    reached root without finding a stored value.
-    """
-
-    def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
-        """Four-checkpoint chain spanning the migration boundary:
-
-        * `cp0` — pre-delta ancestor OLDER than the seed. Its write
-          (`OLDER-WRITE`) is already folded into `cp1`'s stored value, so the
-          walk must terminate at `cp1` and never reach it.
-        * `cp1` — pre-delta, blob `["A"]`. That value is the state ENTERING
-          `cp1`; the write stored under `cp1` (`PRE-DELTA-WRITE`) is what
-          produced `cp2` and is NOT subsumed by the blob.
-        * `cp2` — delta-era, no stored value, write `B`.
-        * `cp3` — target, delta-era, write `PENDING-AT-TARGET`.
-
-        Reconstructing at `cp3` must yield seed `["A"]` plus writes
-        `["PRE-DELTA-WRITE", "B"]`.
-
-        Returns `(saver, thread_id, ns, channel, cp3_id)`.
-        """
-        saver = InMemorySaver()
-        serde = JsonPlusSerializer()
-        thread_id, ns, channel = "t1", "", "messages"
-
-        v0 = "00000000000000000000000000000000.0"
-        v1 = "00000000000000000000000000000001.0"
-        v2 = "00000000000000000000000000000002.0"
-        v3 = "00000000000000000000000000000003.0"
-
-        # Pre-delta: cp0 and cp1 stored real blobs for the channel.
-        saver.blobs[(thread_id, ns, channel, v0)] = serde.dumps_typed([])
-        saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(["A"])
-        # Delta-era: cp2 and cp3 store "empty"; real writes in checkpoint_writes.
-        saver.blobs[(thread_id, ns, channel, v2)] = ("empty", b"")
-        saver.blobs[(thread_id, ns, channel, v3)] = ("empty", b"")
-
-        cp0 = empty_checkpoint()
-        cp0["id"] = "cp0"
-        cp0["channel_versions"][channel] = v0
-        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] = {
-            "cp0": (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
-            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), "cp0"),
-            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
-            "cp3": (serde.dumps_typed(cp3), serde.dumps_typed({}), "cp2"),
-        }
-        # Write under cp0 is older than the seed — cp1's blob already folded
-        # it in, and the terminator must stop before reaching it.
-        saver.writes[(thread_id, ns, "cp0")][("task0", 0)] = (
-            "task0",
-            channel,
-            serde.dumps_typed("OLDER-WRITE"),
-            "",
-        )
-        # Write under cp1 postdates cp1's blob (it is what produced cp2, which
-        # stores no value of its own) and MUST be replayed.
-        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
-            "task1",
-            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_delta_channel_history(config=config, channels=[channel])[
-            channel
-        ]
-
-        # Seed came from the pre-delta blob at cp1.
-        assert result["seed"] == ["A"]
-        # The seed ancestor's own write and the delta-era write from cp2 both
-        # replay through the reducer on top of the seed, oldest first. 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 == ["PRE-DELTA-WRITE", "B"]
-
-    def test_seed_bounds_walk_without_dropping_its_own_writes(self) -> None:
-        """The seed terminator bounds the walk: writes at ancestors OLDER than
-        the seed are already folded into the seed value and must not be
-        replayed. The seed ancestor's own write is not one of them — it
-        postdates the stored value and produced the next checkpoint.
-        """
-        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_delta_channel_history(config=config, channels=[channel])[
-            channel
-        ]
-
-        values = [v for _, _, v in result["writes"]]
-        # Older than the seed — subsumed by cp1's blob, so the walk stops first.
-        assert "OLDER-WRITE" not in values
-        # Stored AT the seed ancestor — not subsumed, so it must be replayed.
-        assert "PRE-DELTA-WRITE" in values
-        # And the pending write at the target is never folded in.
-        assert "PENDING-AT-TARGET" not in values
@@ -1,3 +1,4 @@
+# mypy: disable-error-code="operator"
 import asyncio
 import json
 from collections.abc import Iterable
@@ -2,8 +2,7 @@ version = 1
 revision = 3
 requires-python = ">=3.10"
 resolution-markers = [
-    "python_full_version >= '3.15'",
-    "python_full_version >= '3.12' and python_full_version < '3.15'",
+    "python_full_version >= '3.12'",
    "python_full_version == '3.11.*'",
    "python_full_version < '3.11'",
 ]
@@ -149,11 +148,11 @@ wheels = [

 [[package]]
 name = "codespell"
-version = "2.4.3"
+version = "2.4.2"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/80/19/45e941380f69c042b43423513d201e6592346f992394347f5e7174c31407/codespell-2.4.3.tar.gz", hash = "sha256:cbe085e331227b37bb86ef8bddd08dc768c704ee9a07ca869852c093fa2793e2", size = 352773, upload-time = "2026-07-15T11:51:54.159Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/2d/9d/1d0903dff693160f893ca6abcabad545088e7a2ee0a6deae7c24e958be69/codespell-2.4.2.tar.gz", hash = "sha256:3c33be9ae34543807f088aeb4832dfad8cb2dae38da61cac0a7045dd376cfdf3", size = 352058, upload-time = "2026-03-05T18:10:42.936Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/8b/bf/bdb951d34eb169140b546f44be9ec4525d1acefb9eb5572071f5492b19fc/codespell-2.4.3-py3-none-any.whl", hash = "sha256:af2505b335e8573dbd2d384d1c4ef498f4006f4ba2d6fceca01e55b91f52628a", size = 340736, upload-time = "2026-07-15T11:51:52.925Z" },
+    { url = "https://files.pythonhosted.org/packages/42/a1/52fa05533e95fe45bcc09bcf8a503874b1c08f221a4e35608017e0938f55/codespell-2.4.2-py3-none-any.whl", hash = "sha256:97e0c1060cf46bd1d5db89a936c98db8c2b804e1fdd4b5c645e82a1ec6b1f886", size = 353715, upload-time = "2026-03-05T18:10:41.398Z" },
 ]

 [[package]]
@@ -229,11 +228,11 @@ wheels = [

 [[package]]
 name = "idna"
-version = "3.15"
+version = "3.11"
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-
 [[package]]
 name = "zstandard"
 version = "0.25.0"
@@ -1 +1,3 @@
 .langgraph_api/
+# Go cross-compiled binaries (built at release time, bundled into wheels)
+langgraph_cli/bin/
@@ -0,0 +1,374 @@
+# 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
@@ -1,39 +1,122 @@
 .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"
-test:
+GO_FILES=$(shell find cmd internal -type f -name '*.go' 2>/dev/null)
+test: test-go
 	uv run pytest $(TEST)
 test-integration:
 	uv run pytest tests/integration_tests

+test-go:
+	[ ! -f go.mod ] || go test ./...
+
 ######################
 # LINTING AND FORMATTING
 ######################

 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
+MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 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 lint_diff lint_package lint_tests: lint-go
 	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)" = "" ] || uv run ty check $(PYTHON_FILES)
+	[ "$(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:
-	uv run ty check $(PYTHON_FILES)
+	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)

-format format_diff:
+format format_diff: format-go
 	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

@@ -1,47 +1,29 @@
 # LangGraph CLI

-[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-cli?label=%20)](https://pypi.org/project/langgraph-cli/#history)
-[![PyPI - License](https://img.shields.io/pypi/l/langgraph-cli)](https://opensource.org/licenses/MIT)
-[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-cli)](https://pypistats.org/packages/langgraph-cli)
-[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
+The official command-line interface for LangGraph, providing tools to create, develop, and deploy LangGraph applications.

-To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
-[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
-
-## Quick Install
+## Installation

+Install via pip:
 ```bash
-uv add langgraph-cli
+pip install langgraph-cli
 ```

-## 🤔 What is this?
-
-The LangGraph CLI is the official command-line interface for LangGraph. It provides tools to create, develop, build, and run LangGraph applications locally or in Docker.
-
-## 📖 Documentation
-
-For full documentation, see the [LangGraph CLI reference](https://reference.langchain.com/python/langgraph-cli). For conceptual guides and tutorials, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
-
 For development mode with hot reloading:
-
 ```bash
-uv add "langgraph-cli[inmem]"
+pip install "langgraph-cli[inmem]"
 ```

 ## Commands

 ### `langgraph new` 🌱
-
-Create a new LangGraph project from a template.
-
+Create a new LangGraph project from a template
 ```bash
 langgraph new [PATH] --template TEMPLATE_NAME
 ```

 ### `langgraph dev` 🏃‍♀️
-
-Run LangGraph API server in development mode with hot reloading.
-
+Run LangGraph API server in development mode with hot reloading
 ```bash
 langgraph dev [OPTIONS]
  --host TEXT                 Host to bind to (default: 127.0.0.1)
@@ -53,9 +35,7 @@ langgraph dev [OPTIONS]
 ```

 ### `langgraph up` 🚀
-
-Launch LangGraph API server in Docker.
-
+Launch LangGraph API server in Docker
 ```bash
 langgraph up [OPTIONS]
  -p, --port INTEGER        Port to expose (default: 8123)
@@ -67,9 +47,7 @@ langgraph up [OPTIONS]
 ```

 ### `langgraph build`
-
-Build a Docker image for your LangGraph application.
-
+Build a Docker image for your LangGraph application
 ```bash
 langgraph build -t IMAGE_TAG [OPTIONS]
  --platform TEXT          Target platforms (e.g., linux/amd64,linux/arm64)
@@ -78,9 +56,7 @@ langgraph build -t IMAGE_TAG [OPTIONS]
 ```

 ### `langgraph dockerfile`
-
-Generate a Dockerfile for custom deployments.
-
+Generate a Dockerfile for custom deployments
 ```bash
 langgraph dockerfile SAVE_PATH [OPTIONS]
  -c, --config FILE       Config file path
@@ -92,18 +68,18 @@ The CLI uses a `langgraph.json` configuration file with these key settings:

 ```json
 {
-  "dependencies": ["langchain_openai", "./your_package"],
+  "dependencies": ["langchain_openai", "./your_package"],  // Required: Package dependencies
  "graphs": {
-    "my_graph": "./your_package/file.py:graph"
+    "my_graph": "./your_package/file.py:graph"            // Required: Graph definitions
  },
-  "env": "./.env",
-  "python_version": "3.11",
-  "pip_config_file": "./pip.conf",
-  "dockerfile_lines": []
+  "env": "./.env",                                        // Optional: Environment variables
+  "python_version": "3.11",                               // Optional: Python version (3.11/3.12)
+  "pip_config_file": "./pip.conf",                        // Optional: pip configuration
+  "dockerfile_lines": []                                  // Optional: Additional Dockerfile commands
 }
 ```

-See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.
+See the [full documentation](https://langchain-ai.github.io/langgraph/cloud/reference/cli/) for detailed configuration options.

 ## Development

@@ -111,26 +87,19 @@ To develop the CLI itself:

 1. Clone the repository
 2. Navigate to the CLI directory: `cd libs/cli`
-3. Install development dependencies: `uv sync`
+3. Install development dependencies: `uv pip install`
 4. Make your changes to the CLI code
 5. Test your changes:
+   ```bash
+   # Run CLI commands directly
+   uv run langgraph --help
+   
+   # Or use the examples
+   cd examples
+   uv pip install
+   uv run langgraph dev  # or other commands
+   ```

-```bash
-# Run CLI commands directly
-uv run langgraph --help
+## License

-# Or use the examples
-cd examples
-uv sync
-uv run langgraph dev  # or other commands
-```
-
-## 📕 Releases & Versioning
-
-See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
-
-## 💁 Contributing
-
-As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
-
-For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
+This project is licensed under the terms specified in the repository's LICENSE file.
@@ -0,0 +1,11 @@
+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))
+}
@@ -5,5 +5,5 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14"
+  "langchain-openai==1.0.1"
 ]
@@ -5,8 +5,8 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14",
-  "langchain-anthropic==1.4.6",
+  "langchain-openai==1.0.0a2",
+  "langchain-anthropic==1.0.0a5",
  "langgraph==1.1.5"
 ]

@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14",
+  "langchain-openai==1.0.0a2",
  "langgraph==1.1.2",
  "langchain_community>=0.3.0",
 ]
@@ -236,7 +236,7 @@ def swap_roles(state: InterviewState, name: str):
    converted = []
    for message in state["messages"]:
        if isinstance(message, AIMessage) and message.name != name:
-            message = HumanMessage(**message.model_dump(exclude={"type"}))
+            message = HumanMessage(**message.dict(exclude={"type"}))
        converted.append(message)
    return {"messages": converted}

@@ -0,0 +1,3 @@
+module github.com/langchain-ai/langgraph/libs/cli
+
+go 1.23.0
@@ -0,0 +1,56 @@
+"""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:
+        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 = Path("langgraph_cli/bin")
+        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}"
@@ -0,0 +1,672 @@
+// 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) {
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		return nil, fmt.Errorf("could not read config file: %w", err)
+	}
+
+	var raw map[string]any
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, fmt.Errorf("Invalid JSON in %s: %s", configPath, err.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: %s", err.Error())
+	}
+
+	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]
+		}
+	}
+}
@@ -0,0 +1,568 @@
+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)
+		}
+	})
+}
@@ -0,0 +1,804 @@
+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")
+}
@@ -0,0 +1,272 @@
+// 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)
+}
@@ -0,0 +1,306 @@
+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
+}
@@ -0,0 +1,154 @@
+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)
+	}
+}
@@ -0,0 +1,529 @@
+// 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()
+}
@@ -0,0 +1,290 @@
+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)
+		}
+	}
+}
@@ -0,0 +1,123 @@
+// 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
+}
@@ -0,0 +1,205 @@
+package root
+
+import (
+	"bytes"
+	"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 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)
+	}
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Will Fu-Hinthorn	f9d5b0bc15	Merge branch 'main' into wfh/cli_validate	2026-04-08 05:56:49 -07:00
Will Fu-Hinthorn	998aa88ea1	update	2026-04-08 05:47:23 -07:00
Will Fu-Hinthorn	627cf19464	update	2026-04-08 05:40:59 -07:00
Will Fu-Hinthorn	8e89c8b155	chore: migration 1	2026-04-08 04:46:31 -07:00
Will Fu-Hinthorn	98fd216ce7	release	2026-04-07 18:20:20 -07:00
Will Fu-Hinthorn	247ef5edf7	chore: add validate command	2026-04-07 18:20:10 -07:00
Will Fu-Hinthorn	648f03d715	chore: validate	2026-04-07 17:56:19 -07:00