fix(langgraph): detect subgraphs from bytecode instead of source (#8569)

Fixes langchain-ai/langgraph#8559

`find_subgraph_pregel` runs once per node at build time and recovers
each node function's reachable values with `inspect.getsource` +
`ast.parse`; langchain-ai/langgraph#8559 measures that source parsing at
80% of `StateGraph.compile()`. This replaces it with a `dis` walk over
`func.__code__`, which reads the same information already in memory.

Closure cells and the globals named in `co_names` supply the values
directly, and a walk over the instruction stream recovers the attribute
paths the function actually takes. The closure alone cannot express
those: a captured `holder` whose graph lives at `holder.graph` is
reachable only if something records that `graph` is loaded off `holder`.

Both implementations over-declare — a node can reference a graph it
never invokes — and this one over-declares a different set. It no longer
reports a graph named only along an attribute path in code the compiler
removed; such a path cannot execute, so that entry was always a phantom.
Nothing that can actually run stopped being detected.
`find_subgraph_pregel` returns the first `PregelProtocol` it finds, so
the remaining extra candidates only widen detection.

## Release note

Subgraph auto-detection now reads node functions' bytecode instead of
parsing their source. Graph builds with many function-backed nodes are
substantially faster, and subgraphs are now detected inside functions
with no retrievable source — defined in a REPL or notebook cell, or via
`exec` — where detection previously failed silently and returned
nothing.

## Performance

Against
[langgraph-build-bench](<https://github.com/soarez/langgraph-build-bench>)
— 713 nodes, 500 state fields, 264 tools; CPython 3.12.8, Apple silicon:

```
before   build 1412 ms   subgraph detection 1132 ms  (80%)
after    build  286 ms   subgraph detection    4 ms   (2%)
```

**4.9x on total build, \~266x on detection.** The bench prints whole ms;
at full precision detection is 1139 ms -> 4.23 ms.

Co-authored-by: Elior Nataf Lackritz <elior.nataflackritz@langchain.dev>

.github/actions/uv_setup/action.yml

@@ -24,7 +24,7 @@ runs:
   using: composite
   steps:
     - name: Install uv and set the python version
-      uses: astral-sh/setup-uv@v7
+      uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
       with:
         python-version: ${{ inputs.python-version }}
         enable-cache: ${{ inputs.enable-cache }}

.github/workflows/_integration_test.yml

@@ -37,7 +37,7 @@ jobs:
       run:
         working-directory: libs/cli
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Get changed files
         id: changed-files
         if: github.event_name != 'workflow_dispatch'
@@ -126,8 +126,8 @@ jobs:
             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" != "1.0.0a5" ]; then
-            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.0.0a5; $LANGCHAIN_ANTHROPIC_VERSION"
+          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.4.6" ]; then
+            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.4.6; $LANGCHAIN_ANTHROPIC_VERSION"
             exit 1
           fi
 

.github/workflows/_lint.yml

@@ -31,7 +31,7 @@ jobs:
           - "3.12"
     name: "lint #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Get changed files
         id: changed-files
         if: github.event_name != 'workflow_dispatch'

.github/workflows/_sdk_integration_test.yml

@@ -23,7 +23,7 @@ jobs:
     env:
       HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
         uses: ./.github/actions/uv_setup
@@ -33,7 +33,7 @@ jobs:
           working-directory: libs/sdk-py
 
       - name: Login to Docker Hub
-        uses: docker/login-action@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test.yml

@@ -25,7 +25,7 @@ jobs:
 
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - 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@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_langgraph.yml

@@ -23,7 +23,7 @@ jobs:
         working-directory: libs/langgraph
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - 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@650006c6eb7dba73a995cc03b0b2d7f5ca915bee # v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_release.yml

@@ -23,7 +23,7 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - 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@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
@@ -74,15 +74,15 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true

.github/workflows/baseline.yml

@@ -17,7 +17,7 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - 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@v5
+        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           key: ${{ runner.os }}-benchmark-baseline-${{ env.SHA }}
           path: |

.github/workflows/bench.yml

@@ -15,7 +15,7 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - 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@v5
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           key: ${{ runner.os }}-benchmark-baseline
           restore-keys: |
@@ -57,7 +57,7 @@ jobs:
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Annotation
-        uses: actions/github-script@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         env:
           CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
           BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}

.github/workflows/ci.yml

@@ -30,8 +30,8 @@ jobs:
       deps: ${{ steps.filter.outputs.deps || 'true' }}
       sdk_py: ${{ steps.filter.outputs.sdk_py || 'true' }}
     steps:
-      - uses: actions/checkout@v6
-      - uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dorny/paths-filter@7b450fff21473bca461d4b92ce414b9d0420d706 # v4
         if: github.event_name != 'workflow_dispatch'
         id: filter
         with:
@@ -112,9 +112,9 @@ jobs:
     name: "Check SDK methods matching"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.11"
       - name: Run check_sdk_methods script
@@ -130,7 +130,7 @@ jobs:
         python-version:
           - "3.13"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python ${{ matrix.python-version }}
         uses: ./.github/actions/uv_setup
         with:

.github/workflows/deploy-redirects.yml

@@ -26,10 +26,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: '3.11'
 
@@ -37,13 +37,13 @@ jobs:
         run: python docs/generate_redirects.py
 
       - name: Setup Pages
-        uses: actions/configure-pages@v6
+        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v5
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
         with:
           path: 'docs/_site'
 
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v5
+        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
       tag: ${{ steps.check-version.outputs.tag }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
         uses: ./.github/actions/uv_setup
@@ -51,7 +51,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -87,7 +87,7 @@ jobs:
     outputs:
       release-body: ${{ steps.generate-release-body.outputs.release-body }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           repository: langchain-ai/langgraph
           path: langgraph
@@ -158,7 +158,7 @@ jobs:
       - test-pypi-publish
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       # We explicitly *don't* set up caching here. This ensures our tests are
       # maximally sensitive to catching breakage.
@@ -262,7 +262,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
         uses: ./.github/actions/uv_setup
@@ -272,13 +272,13 @@ jobs:
           enable-cache: false
           working-directory: ${{ inputs.working-directory }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true
@@ -304,7 +304,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
         uses: ./.github/actions/uv_setup
@@ -314,7 +314,7 @@ jobs:
           enable-cache: false
           working-directory: ${{ inputs.working-directory }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/

.github/workflows/reopen_on_assignment.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Find and reopen matching PRs
-        uses: actions/github-script@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           script: |
             const { owner, repo } = context.repo;

.github/workflows/require_issue_link.yml

@@ -50,7 +50,7 @@ jobs:
     steps:
       - name: Check for issue link and assignee
         id: check-link
-        uses: actions/github-script@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           script: |
             const { owner, repo } = context.repo;

.github/workflows/tag-external-issues.yml

@@ -55,7 +55,7 @@ jobs:
     steps:
       - name: Generate GitHub App token
         id: app-token
-        uses: actions/create-github-app-token@v3
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v3
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
         with:
           app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
           private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
 
       - name: Backfill labels
-        uses: actions/github-script@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           github-token: ${{ steps.app-token.outputs.token }}
           script: |

.github/workflows/tag-external-prs.yml

@@ -40,7 +40,7 @@ jobs:
     steps:
       - name: Generate GitHub App token
         id: app-token
-        uses: actions/create-github-app-token@v3
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         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@v9
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |

.github/workflows/uv_lock_ugprade.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       
       - name: Set up uv
         uses: ./.github/actions/uv_setup

examples/README.md

@@ -1,3 +1,11 @@
 # LangGraph examples
 
-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.
+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).

examples/delta-channel-dump/README.md

@@ -0,0 +1,132 @@
+# 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.

examples/delta-channel-dump/dump.py

@@ -0,0 +1,469 @@
+#!/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())

libs/checkpoint-conformance/README.md

@@ -1,15 +1,27 @@
-# langgraph-checkpoint-conformance
+# LangGraph Checkpoint Conformance
 
-Conformance test suite for [LangGraph](https://github.com/langchain-ai/langgraph) checkpointer implementations.
+[![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)
 
-Validates that a `BaseCheckpointSaver` subclass correctly implements the checkpoint storage contract — blob round-trips, metadata preservation, namespace isolation, incremental channel updates, and more.
+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.
 
-## Installation
+## Quick Install
 
 ```bash
-pip install langgraph-checkpoint-conformance
+uv add 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()`:
@@ -110,3 +122,13 @@ 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).

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

@@ -6,9 +6,12 @@ import traceback
 from collections.abc import Callable
 from uuid import uuid4
 
-from langgraph.checkpoint.base import BaseCheckpointSaver
+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(
@@ -48,8 +51,6 @@ async def test_history_seed_is_nearest_snapshot(
     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"]
-    from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
     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"]
@@ -81,11 +82,6 @@ async def test_history_multi_channel(
     tid = str(uuid4())
     configs: list = []
     parent_cfg = None
-    from langgraph.checkpoint.base import Checkpoint
-    from langgraph.checkpoint.base.id import uuid6
-    from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-    from langgraph.checkpoint.conformance.test_utils import generate_metadata
 
     for step in range(5):
         config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
@@ -161,11 +157,6 @@ async def test_history_migration_plain_value_as_seed(
     channel_values[ch] (not a _DeltaSnapshot). The walk should treat it as the
     seed and terminate there.
     """
-    from langgraph.checkpoint.base import Checkpoint
-    from langgraph.checkpoint.base.id import uuid6
-
-    from langgraph.checkpoint.conformance.test_utils import generate_metadata
-
     tid = str(uuid4())
     configs: list = []
     parent_cfg = None
@@ -208,6 +199,74 @@ async def test_history_migration_plain_value_as_seed(
     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,
@@ -216,6 +275,7 @@ ALL_DELTA_CHANNEL_HISTORY_TESTS = [
     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,
 ]
 
 

libs/checkpoint-conformance/pyproject.toml

@@ -58,8 +58,14 @@ 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]

libs/checkpoint-conformance/uv.lock

@@ -247,7 +247,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.0"
+version = "1.5.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -260,26 +260,26 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/59/de/679a53472c25860837e32c0442c962fa86e95317a36460e2c9d5c91b17c2/langchain_core-1.4.0.tar.gz", hash = "sha256:1dc341eed802ed9c117c0df3923c991e5e9e226571e5725c194eeb5bd93d1a7f", size = 920260, upload-time = "2026-05-11T18:42:35.919Z" }
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+    { url = "https://files.pythonhosted.org/packages/ca/e4/024e402a65f5ee2eb6ae9667b5ffc5f08776cb4e712f5a11ee1997d56083/langchain_core-1.5.2-py3-none-any.whl", hash = "sha256:a687dd7c3b22c6c1294e1c1eeb61fb6f3a308e6015a1d75b576b3836ad5b5aed", size = 561643, upload-time = "2026-07-28T16:38:36.38Z" },
 ]
 
 [[package]]
 name = "langchain-protocol"
-version = "0.0.15"
+version = "0.0.18"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/4f/24/9777489d6fbbee64af0c8f96d4f840239c408cf694f3394672807dafc490/langchain_protocol-0.0.15.tar.gz", hash = "sha256:9ab2d11ee73944754f10e037e717098d3a6796f0e58afa9cadda6154e7655ade", size = 5862, upload-time = "2026-05-01T22:30:04.748Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d2/59/b5959aea96faa9146e2e49a7a22882b3528c62efafe9a6a95beab30c2305/langchain_protocol-0.0.18.tar.gz", hash = "sha256:ec3e11782f1ed0c9db38e5a9ed01b0e7a0d3fba406faa8aef6594b73c56a63e6", size = 6150, upload-time = "2026-06-18T17:08:26.959Z" }
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+    { url = "https://files.pythonhosted.org/packages/99/2e/d82db9eec13ad0f72e7aaad5c4bc730ab111934fdc83c85523206eb9b0a0/langchain_protocol-0.0.18-py3-none-any.whl", hash = "sha256:70b53a86fbf9cedc863555effe44da192ab02d556ddbf2cf95b8873adcf41b5a", size = 7221, upload-time = "2026-06-18T17:08:25.996Z" },
 ]
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.2.0"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -370,7 +370,7 @@ test = [
 
 [[package]]
 name = "langsmith"
-version = "0.8.2"
+version = "0.8.18"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -380,12 +380,13 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "websockets" },
     { name = "xxhash" },
     { name = "zstandard" },
 ]
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 [[package]]
@@ -685,7 +686,7 @@ wheels = [
 
 [[package]]
 name = "pytest"
-version = "9.0.3"
+version = "9.1.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -696,9 +697,9 @@ dependencies = [
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 ]
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 [[package]]
 name = "xxhash"
 version = "3.7.0"

libs/checkpoint-postgres/README.md

@@ -1,10 +1,28 @@
 # LangGraph Checkpoint Postgres
 
-Implementation of LangGraph CheckpointSaver that uses 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)
 
-## Dependencies
+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.
 
-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]`).
+## 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
 
@@ -20,10 +38,12 @@ By default `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) withou
 > 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
@@ -47,24 +67,12 @@ 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},
         },
     }
 
@@ -88,24 +96,12 @@ 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},
         },
     }
 
@@ -118,3 +114,13 @@ 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).

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

@@ -223,7 +223,7 @@ 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", "")
@@ -478,9 +478,11 @@ class PostgresSaver(BasePostgresSaver):
         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]
-        hs_by_i_by_cid: list[dict[str, bool]] = [{} 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
@@ -489,7 +491,8 @@ class PostgresSaver(BasePostgresSaver):
             while True:
                 stage1_params: list[Any] = []
                 for ch in channels:
-                    stage1_params.extend([ch, ch])
+                    # 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]
                 )
@@ -502,16 +505,19 @@ class PostgresSaver(BasePostgresSaver):
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hs_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,
-                    hs_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,
                 )
@@ -546,6 +552,7 @@ class PostgresSaver(BasePostgresSaver):
             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),
         )
 

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

@@ -426,9 +426,11 @@ class AsyncPostgresSaver(BasePostgresSaver):
         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]
-        hs_by_i_by_cid: list[dict[str, bool]] = [{} 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
@@ -437,7 +439,8 @@ class AsyncPostgresSaver(BasePostgresSaver):
             while True:
                 stage1_params: list[Any] = []
                 for ch in channels:
-                    stage1_params.extend([ch, ch])
+                    # 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]
                 )
@@ -450,16 +453,19 @@ class AsyncPostgresSaver(BasePostgresSaver):
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hs_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,
-                    hs_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,
                 )
@@ -490,6 +496,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
             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),
         )
 
@@ -573,7 +580,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:

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

@@ -199,27 +199,68 @@ class _DeltaStage2Row(TypedDict, total=False):
 
 
 def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
-    """Build stage 1 SQL with 2K parallel JSONB key lookups.
+    """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,
-               (checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_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,
-               (checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_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
 
-    Channel names are passed as `%s` parameters (safe from SQL injection).
-    Only the column aliases `ver_i` / `hs_i` are interpolated into the
-    SQL string (i is bounded by len(channels) and uses safe identifiers).
+    A stored value for a channel lives in one of two places, because `put`
+    splits them:
 
-    Caller must extend params with `[ch_0, ch_0, ch_1, ch_1, ...,
-    thread_id, ns, cursor, cursor, page_size]` when `paged=True`.
+    * **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.
@@ -228,7 +269,13 @@ def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
     for i in range(len(channels)):
         cols.append(
             f"checkpoint -> 'channel_versions' ->> %s AS ver_{i}, "
-            f"(checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_{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, "
@@ -342,7 +389,8 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         channels: Sequence[str],
         parent_of: dict[str, str | None],
         ver_by_i_by_cid: list[dict[str, str | None]],
-        hs_by_i_by_cid: list[dict[str, bool]],
+        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.
 
@@ -356,7 +404,8 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
             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}"))
-                hs_by_i_by_cid[i][cid] = bool(r.get(f"hs_{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
@@ -367,9 +416,11 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         channels: Sequence[str],
         parent_of: Mapping[str, str | None],
         ver_by_i_by_cid: Sequence[Mapping[str, str | None]],
-        hs_by_i_by_cid: Sequence[Mapping[str, bool]],
+        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:
@@ -377,14 +428,15 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
 
         Uses the partial `parent_of` map accumulated so far. A walk stops
         either because:
-          (a) it found a snapshot for its channel (channel becomes seeded),
+          (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`, `walk_cursor_by_ch`, and
-        `seeded` in place.
+        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:
@@ -394,15 +446,22 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                 walk_cursor_by_ch[ch] = parent_of.get(target_id)
             cur_cid = walk_cursor_by_ch[ch]
             ch_chain = chain_by_ch[ch]
-            hs_i = hs_by_i_by_cid[i]
+            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)
-                if hs_i.get(cur_cid, False):
+                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
@@ -415,16 +474,23 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         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. The `seed` key is omitted
-        when the walk reached root with no snapshot found, or when the
-        seed blob is sentinel "empty" — in both cases the consumer treats
-        absence as "start empty".
+        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]]]] = {
@@ -473,6 +539,10 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                 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
 

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

@@ -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]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:

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

@@ -4,6 +4,7 @@ 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
@@ -238,6 +239,12 @@ 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,
@@ -258,12 +265,17 @@ 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 = """
+            query = f"""
                 WITH passed_in AS (
                     SELECT unnest(%s::text[]) AS key,
                         unnest(%s::bool[])  AS do_refresh
@@ -276,12 +288,14 @@ 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 = (
@@ -422,6 +436,13 @@ 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):
@@ -443,8 +464,9 @@ class BasePostgresStore(Generic[C]):
             ns_condition = "TRUE"
             ns_param: Sequence[str] | None = None
             if op.namespace_prefix:
-                ns_condition = "store.prefix LIKE %s"
-                ns_param = (f"{_namespace_to_text(op.namespace_prefix)}%",)
+                ns_condition, ns_param = _namespace_prefix_condition(
+                    op.namespace_prefix
+                )
             else:
                 ns_param = ()
 
@@ -491,7 +513,7 @@ 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}
+                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
                         ORDER BY {score_operator} ASC
                         LIMIT %s
                     """
@@ -527,7 +549,7 @@ 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}
+                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
                         ORDER BY store.updated_at DESC
                         LIMIT %s
                         OFFSET %s
@@ -591,18 +613,23 @@ 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 == "prefix":
-                        conditions.append("prefix LIKE %s")
+                    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")
                         params.append(
-                            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)}"
+                            _namespace_match_pattern(
+                                condition.path, condition.match_type
+                            )
                         )
                     else:
                         logger.warning(
@@ -1248,15 +1275,59 @@ def _get_index_params(store: Any) -> tuple[str, dict[str, Any]]:
     return kind, sanitized
 
 
-def _namespace_to_text(
-    namespace: tuple[str, ...], handle_wildcards: bool = False
-) -> str:
+def _namespace_to_text(namespace: tuple[str, ...]) -> 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,

libs/checkpoint-postgres/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.0"
+version = "3.1.2"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -32,6 +32,7 @@ test = [
   "pytest-mock",
   "psycopg[binary]",
   "langgraph-checkpoint",
+  "langgraph-checkpoint-conformance",
   "pytest-watcher",
 ]
 lint = [
@@ -49,6 +50,7 @@ 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"]
@@ -64,6 +66,8 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]

libs/checkpoint-postgres/tests/test_async.py

@@ -380,13 +380,15 @@ async def test_delta_channel_chain_reconstruction(saver_name: str) -> None:
         "langgraph.channels.delta", reason="langgraph core not installed"
     )
 
-    from typing import Annotated
+    # 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
-    from langgraph.channels.delta import DeltaChannel
-    from langgraph.graph import START, StateGraph
-    from langgraph.graph.message import _messages_delta_reducer
-    from typing_extensions import TypedDict
+    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)]

libs/checkpoint-postgres/tests/test_async_store.py

@@ -739,3 +739,135 @@ 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"]

libs/checkpoint-postgres/tests/test_conformance_delta.py

@@ -0,0 +1,30 @@
+"""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}")

libs/checkpoint-postgres/tests/test_delta_plain_value_seed.py

@@ -0,0 +1,204 @@
+"""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

libs/checkpoint-postgres/tests/test_store.py

@@ -20,6 +20,10 @@ 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,
@@ -326,6 +330,127 @@ 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 = [
@@ -863,6 +988,133 @@ 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",
     [
@@ -899,3 +1151,16 @@ 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"),
+    }

libs/checkpoint-postgres/uv.lock

@@ -17,16 +17,16 @@ wheels = [
 
 [[package]]
 name = "anyio"
-version = "4.13.0"
+version = "4.14.2"
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+    { url = "https://files.pythonhosted.org/packages/da/35/f2287558c17e29fafc8ef3daf819bb9834061cfa43bff8014f7df7f63bdc/anyio-4.14.2-py3-none-any.whl", hash = "sha256:9f505dda5ac9f0c8309b5e8bd445a8c2bf7246f3ce950121e45ea15bc41d1494", size = 125813, upload-time = "2026-07-12T20:29:05.763Z" },
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 [[package]]
@@ -138,11 +138,11 @@ wheels = [
 
 [[package]]
 name = "codespell"
-version = "2.4.2"
+version = "2.4.3"
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+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" }
 wheels = [
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+    { 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" },
 ]
 
 [[package]]
@@ -159,7 +159,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions" },
 ]
 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 = [
@@ -244,7 +244,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.0"
+version = "1.5.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -257,26 +257,26 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
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+    { url = "https://files.pythonhosted.org/packages/ca/e4/024e402a65f5ee2eb6ae9667b5ffc5f08776cb4e712f5a11ee1997d56083/langchain_core-1.5.2-py3-none-any.whl", hash = "sha256:a687dd7c3b22c6c1294e1c1eeb61fb6f3a308e6015a1d75b576b3836ad5b5aed", size = 561643, upload-time = "2026-07-28T16:38:36.38Z" },
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 [[package]]
 name = "langchain-protocol"
-version = "0.0.15"
+version = "0.0.18"
 source = { registry = "https://pypi.org/simple" }
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     { name = "typing-extensions" },
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 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.2.0"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -322,9 +322,36 @@ 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-postgres"
-version = "3.1.0"
+version = "3.1.2"
 source = { editable = "." }
 dependencies = [
     { name = "langgraph-checkpoint" },
@@ -338,6 +365,7 @@ dev = [
     { name = "anyio" },
     { name = "codespell" },
     { name = "langgraph-checkpoint" },
+    { name = "langgraph-checkpoint-conformance" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -354,6 +382,7 @@ lint = [
 test = [
     { name = "anyio" },
     { name = "langgraph-checkpoint" },
+    { name = "langgraph-checkpoint-conformance" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -374,6 +403,7 @@ dev = [
     { name = "anyio" },
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -390,6 +420,7 @@ lint = [
 test = [
     { name = "anyio" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -399,7 +430,7 @@ test = [
 
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-version = "0.8.0"
+version = "0.8.18"
 source = { registry = "https://pypi.org/simple" }
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     { name = "httpx" },
@@ -409,12 +440,13 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "websockets" },
     { name = "xxhash" },
     { name = "zstandard" },
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+version = "9.1.1"
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+
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 name = "xxhash"
 version = "3.6.0"

libs/checkpoint-sqlite/README.md

@@ -1,6 +1,26 @@
 # LangGraph SQLite Checkpoint
 
-Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)
+[![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
 
@@ -91,3 +111,13 @@ 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).

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

@@ -77,7 +77,7 @@ 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 +222,7 @@ 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

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

@@ -212,7 +212,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:

libs/checkpoint-sqlite/langgraph/store/sqlite/aio.py

@@ -24,11 +24,13 @@ 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,
 )
@@ -150,6 +152,13 @@ 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(
                 """

libs/checkpoint-sqlite/langgraph/store/sqlite/base.py

@@ -93,12 +93,74 @@ class SqliteIndexConfig(IndexConfig):
     pass
 
 
-def _namespace_to_text(
-    namespace: tuple[str, ...], handle_wildcards: bool = False
-) -> str:
+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:
     """Convert namespace tuple to text string."""
-    if handle_wildcards:
-        namespace = tuple("%" if val == "*" else val for val in namespace)
     return ".".join(namespace)
 
 
@@ -461,8 +523,11 @@ class BaseSqliteStore:
                     else " AND " + " AND ".join(filter_conditions)
                 )
                 if op.namespace_prefix:
-                    prefix_filter_str = f"WHERE s.prefix LIKE ? {filter_str} "
-                    ns_args: Sequence = (f"{_namespace_to_text(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
                 else:
                     ns_args = ()
                     if filter_str:
@@ -503,12 +568,15 @@ class BaseSqliteStore:
                 ]
             # Regular search branch (no vector search)
             else:
-                base_query = """
+                ns_condition, ns_args_tuple = _namespace_prefix_condition(
+                    op.namespace_prefix
+                )
+                base_query = f"""
                     SELECT prefix, key, value, created_at, updated_at, expires_at, ttl_minutes, NULL as score
                     FROM store
-                    WHERE prefix LIKE ?
+                    WHERE {ns_condition}
                 """
-                params = [f"{_namespace_to_text(op.namespace_prefix)}%"]
+                params = list(ns_args_tuple)
 
                 if filter_conditions:
                     params.extend(filter_params)
@@ -549,16 +617,28 @@ class BaseSqliteStore:
 
             if op.match_conditions:
                 for cond in op.match_conditions:
-                    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)}"
-                        )
+                    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)
+                            )
                     else:
                         logger.warning(
                             "Unknown match_type in list_namespaces: %s", cond.match_type
@@ -785,6 +865,9 @@ 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

libs/checkpoint-sqlite/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-sqlite"
-version = "3.1.0"
+version = "3.1.1"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -30,6 +30,7 @@ test = [
   "pytest-mock",
   "pytest-watcher",
   "langgraph-checkpoint",
+  "langgraph-checkpoint-conformance",
   "pytest-retry>=1.7.0",
 ]
 lint = [
@@ -47,6 +48,7 @@ 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"]
@@ -62,6 +64,8 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]

libs/checkpoint-sqlite/tests/test_async_store.py

@@ -716,3 +716,32 @@ 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"),
+    }

libs/checkpoint-sqlite/tests/test_conformance_delta.py

@@ -3,21 +3,14 @@
 from __future__ import annotations
 
 import pytest
+from langgraph.checkpoint.conformance import validate
+from langgraph.checkpoint.conformance.initializer import checkpointer_test
 
-pytest.importorskip(
-    "langgraph.checkpoint.conformance",
-    reason="langgraph-checkpoint-conformance not installed",
-)
-pytest.importorskip("aiosqlite", reason="aiosqlite not installed")
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
 
 
 @pytest.mark.asyncio
 async def test_delta_channel_conformance():
-    from langgraph.checkpoint.conformance import validate
-    from langgraph.checkpoint.conformance.initializer import checkpointer_test
-
-    from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
-
     @checkpointer_test(name="AsyncSqliteSaver")
     async def sqlite_saver():
         async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:

libs/checkpoint-sqlite/tests/test_delta_channel_migration.py

@@ -29,13 +29,13 @@ pytest.importorskip("langgraph.channels.delta", reason="langgraph core not insta
 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: E402,I001
-from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: E402
-from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]  # noqa: E402
-from typing_extensions import TypedDict  # noqa: E402
+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  # noqa: E402
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver  # noqa: E402
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
 
 pytestmark = pytest.mark.anyio
 

libs/checkpoint-sqlite/tests/test_get_delta_channel_history.py

@@ -32,13 +32,13 @@ from langchain_core.runnables import RunnableConfig
 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: E402,I001
-from langgraph.checkpoint.serde.types import _DeltaSnapshot  # noqa: E402
-from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]  # noqa: E402
-from typing_extensions import TypedDict  # noqa: E402
+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  # noqa: E402
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver  # noqa: E402
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
 
 pytestmark = pytest.mark.anyio
 

libs/checkpoint-sqlite/tests/test_store.py

@@ -1,7 +1,11 @@
+import math
 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
@@ -18,7 +22,13 @@ from langgraph.store.base import (
 )
 
 from langgraph.store.sqlite import SqliteStore
-from langgraph.store.sqlite.base import SqliteIndexConfig
+from langgraph.store.sqlite.base import (
+    NS_MATCH_FUNCTION,
+    BaseSqliteStore,
+    SqliteIndexConfig,
+    _escape_glob_literal,
+    _namespace_match_pattern,
+)
 
 
 # Local embeddings implementation for testing vector search
@@ -27,10 +37,6 @@ 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
@@ -42,9 +48,6 @@ 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())
 
@@ -332,8 +335,6 @@ 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!"}
@@ -1229,3 +1230,208 @@ 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"),
+        }

libs/checkpoint-sqlite/uv.lock

@@ -147,11 +147,11 @@ wheels = [
 
 [[package]]
 name = "codespell"
-version = "2.4.2"
+version = "2.4.3"
 source = { registry = "https://pypi.org/simple" }
-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" }
+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" }
 wheels = [
-    { 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" },
+    { 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" },
 ]
 
 [[package]]
@@ -168,7 +168,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions" },
 ]
 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 = [
@@ -253,7 +253,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.0"
+version = "1.5.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -266,26 +266,26 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/59/de/679a53472c25860837e32c0442c962fa86e95317a36460e2c9d5c91b17c2/langchain_core-1.4.0.tar.gz", hash = "sha256:1dc341eed802ed9c117c0df3923c991e5e9e226571e5725c194eeb5bd93d1a7f", size = 920260, upload-time = "2026-05-11T18:42:35.919Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/6e/58/3ad53096eee1e07728e8219ded30ae308b0f2b8b7b26b8ebb6371917c0f5/langchain_core-1.5.2.tar.gz", hash = "sha256:2d13ab35b42eec63d4669a483776b8cdd778ee764107149369fb369d84c08c41", size = 972322, upload-time = "2026-07-28T16:38:37.977Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/0f/1a/86c38c27b81913a1c6c12448cab55defb5a1097c7dc9a4cea83f55477a2d/langchain_core-1.4.0-py3-none-any.whl", hash = "sha256:23cbbdb46e38ddd1dd5247e6167e96013eae74bea4c5949c550809970a9e565c", size = 548120, upload-time = "2026-05-11T18:42:33.992Z" },
+    { url = "https://files.pythonhosted.org/packages/ca/e4/024e402a65f5ee2eb6ae9667b5ffc5f08776cb4e712f5a11ee1997d56083/langchain_core-1.5.2-py3-none-any.whl", hash = "sha256:a687dd7c3b22c6c1294e1c1eeb61fb6f3a308e6015a1d75b576b3836ad5b5aed", size = 561643, upload-time = "2026-07-28T16:38:36.38Z" },
 ]
 
 [[package]]
 name = "langchain-protocol"
-version = "0.0.15"
+version = "0.0.18"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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+[[package]]
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+version = "0.0.2"
+source = { editable = "../checkpoint-conformance" }
+dependencies = [
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+
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+    { name = "pytest-asyncio" },
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+    { name = "ty" },
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 source = { editable = "." }
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     { name = "langgraph-checkpoint" },
+    { name = "langgraph-checkpoint-conformance" },
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@@ -360,6 +388,7 @@ lint = [
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+    { name = "langgraph-checkpoint-conformance" },
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@@ -378,6 +407,7 @@ requires-dist = [
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+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
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     { name = "pytest-mock" },
@@ -393,6 +423,7 @@ lint = [
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+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
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 name = "xxhash"
 version = "3.6.0"

libs/checkpoint/README.md

@@ -1,6 +1,26 @@
 # LangGraph Checkpoint
 
-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.
+[![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).
 
 ## Key concepts
 
@@ -24,7 +44,7 @@ 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 an default implementation (`langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer`) that handles a wide variety of types, including LangChain and LangGraph primitives, datetimes, enums and more.
+`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.
@@ -89,3 +109,13 @@ 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).

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

@@ -148,17 +148,16 @@ class InMemorySaver(
         whose stored blob is non-empty. Other channels keep walking until
         they find their own terminator or hit the root.
 
-        Pre-delta plain-value blobs subsume their ancestor's pending
-        writes (the value already includes them); `_DeltaSnapshot` blobs
-        do not (snapshot is the value AT that ancestor, prior to its own
-        pending writes that produce the child).
+        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 {}
-        # Imported lazily to avoid a hard checkpoint→serde-types coupling at
-        # module import; only this override needs the runtime check.
-        from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
         thread_id = config["configurable"]["thread_id"]
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         checkpoint_id = config["configurable"].get("checkpoint_id", "")
@@ -205,11 +204,6 @@ class InMemorySaver(
             ):
                 if ch not in remaining:
                     continue
-                blob_value = blob_value_by_ch.get(ch)
-                if blob_value is not None and not isinstance(
-                    blob_value, _DeltaSnapshot
-                ):
-                    continue
                 collected_by_ch[ch].append(
                     (tid, ch, self.serde.loads_typed(serialized))
                 )

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

@@ -552,6 +552,14 @@ 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.
     

libs/checkpoint/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.2.0"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -59,9 +59,15 @@ 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]

libs/checkpoint/tests/test_conformance_delta.py

@@ -12,10 +12,14 @@ conformance = pytest.importorskip(
 
 @pytest.mark.asyncio
 async def test_delta_channel_conformance():
-    from langgraph.checkpoint.conformance import validate
-    from langgraph.checkpoint.conformance.initializer import checkpointer_test
+    # 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
+    from langgraph.checkpoint.memory import InMemorySaver  # noqa: PLC0415
 
     @checkpointer_test(name="InMemorySaver")
     async def mem_saver():

libs/checkpoint/tests/test_encrypted.py

@@ -307,8 +307,6 @@ 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

libs/checkpoint/tests/test_jsonplus.py

@@ -1,9 +1,12 @@
 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
@@ -18,7 +21,7 @@ import ormsgpack
 import pandas as pd
 import pytest
 from langchain_core.documents.base import Document
-from langchain_core.messages import HumanMessage
+from langchain_core.messages import AIMessage, HumanMessage
 from pydantic import BaseModel, SecretStr
 from pydantic.v1 import BaseModel as BaseModelV1
 from pydantic.v1 import SecretStr as SecretStrV1
@@ -341,7 +344,6 @@ def test_lc2_json_safe_type_revives_without_allowlist() -> None:
     constructor dicts. Resuming those threads must reconstruct proper BaseMessage objects
     rather than returning raw dicts that cause MESSAGE_COERCION_FAILURE in add_messages.
     """
-    from langchain_core.messages import AIMessage
 
     serde = JsonPlusSerializer()  # default: _allowed_json_modules=None
 
@@ -410,7 +412,6 @@ def test_lc2_json_method_field_is_ignored() -> None:
     to that method: the result is whatever ``AIMessage(*args, **kwargs)`` would
     produce, which proves the default constructor ran instead of ``parse_raw``.
     """
-    from langchain_core.messages import AIMessage
 
     serde = JsonPlusSerializer()
     load = {
@@ -436,7 +437,6 @@ def test_lc2_json_method_field_is_ignored_for_allowlisted_types() -> None:
     method dispatch as a side effect. Revival is restricted to the default
     constructor regardless of how the class reached the revival path.
     """
-    from langchain_core.messages import AIMessage
 
     serde = JsonPlusSerializer(
         allowed_json_modules=[("langchain_core.messages.ai", "AIMessage")]
@@ -455,7 +455,6 @@ def test_lc2_json_method_field_is_ignored_for_allowlisted_types() -> None:
 
 def test_lc2_json_safe_type_init_still_works() -> None:
     """SAFE-type lc=2 revival without a `method` field still constructs the class."""
-    from langchain_core.messages import AIMessage
 
     serde = JsonPlusSerializer()
     load = {
@@ -479,7 +478,6 @@ def test_lc2_json_legacy_pydantic_method_list_falls_back_to_default() -> None:
     this shape continue to revive correctly as long as the default constructor
     accepts the serialized kwargs.
     """
-    from langchain_core.messages import AIMessage
 
     serde = JsonPlusSerializer()
     load = {
@@ -551,9 +549,6 @@ def test_lc2_json_safe_type_pickle_payload_does_not_execute() -> None:
     With method dispatch removed from `_revive_lc2`, the gadget bytes are never
     passed to `parse_raw` and therefore never reach `pickle.loads`.
     """
-    import os
-    import pickle
-    import tempfile
 
     marker = tempfile.NamedTemporaryFile(
         prefix="lc2_block_proof_", suffix=".out", delete=False

libs/checkpoint/tests/test_memory.py

@@ -1,3 +1,4 @@
+import asyncio
 import logging
 from typing import Any
 
@@ -523,7 +524,6 @@ class TestBaseFallbackGetChannelWrites:
         `threading.local()` guard would let whichever task set it first
         short-circuit the other to `writes=[]`.
         """
-        import asyncio
 
         saver, thread_id, ns = self._build_saver_with_chain()
 
@@ -577,9 +577,19 @@ class TestPreDeltaBlobTerminator:
     """
 
     def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
-        """Three-checkpoint chain: cp1 (pre-delta, blob=[A]), cp2 (delta,
-        write=B), cp3 (delta, write=C). Reconstructing at cp3 must yield
-        seed=[A] + writes=[B, C].
+        """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)`.
         """
@@ -587,16 +597,21 @@ class TestPreDeltaBlobTerminator:
         serde = JsonPlusSerializer()
         thread_id, ns, channel = "t1", "", "messages"
 
+        v0 = "00000000000000000000000000000000.0"
         v1 = "00000000000000000000000000000001.0"
         v2 = "00000000000000000000000000000002.0"
         v3 = "00000000000000000000000000000003.0"
 
-        # Pre-delta: cp1 stored a real blob for the channel.
+        # 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
@@ -608,16 +623,24 @@ class TestPreDeltaBlobTerminator:
         cp3["channel_versions"][channel] = v3
 
         saver.storage[thread_id][ns] = {
-            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "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 cp1 would be from the pre-delta era and MUST be ignored
-        # (the blob already captures it). We add one and assert it is not
-        # folded into the reconstructed result.
-        saver.writes[(thread_id, ns, "cp1")][("task0", 0)] = (
+        # 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"),
             "",
         )
@@ -651,15 +674,19 @@ class TestPreDeltaBlobTerminator:
 
         # Seed came from the pre-delta blob at cp1.
         assert result["seed"] == ["A"]
-        # Delta-era writes from cp2 replay through the reducer on top of seed.
-        # cp3 is the target — its own write is pending for the NEXT step and
-        # must be excluded.
+        # 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 == ["B"]
+        assert values == ["PRE-DELTA-WRITE", "B"]
 
-    def test_pre_delta_blob_terminates_walk_before_older_writes(self) -> None:
-        """Writes stored at the pre-delta ancestor itself must not be replayed
-        (the blob subsumes them)."""
+    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": {
@@ -674,7 +701,9 @@ class TestPreDeltaBlobTerminator:
         ]
 
         values = [v for _, _, v in result["writes"]]
-        # The pre-delta write under cp1 must not appear (the blob subsumes it).
-        assert "PRE-DELTA-WRITE" not in values
+        # 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

libs/checkpoint/uv.lock

@@ -149,11 +149,11 @@ wheels = [
 
 [[package]]
 name = "codespell"
-version = "2.4.2"
+version = "2.4.3"
 source = { registry = "https://pypi.org/simple" }
-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" }
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+
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 name = "xxhash"
 version = "3.6.0"

libs/cli/README.md

@@ -1,29 +1,47 @@
 # LangGraph CLI
 
-The official command-line interface for LangGraph, providing tools to create, develop, and deploy LangGraph applications.
+[![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)
 
-## Installation
+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
 
-Install via pip:
 ```bash
-pip install langgraph-cli
+uv add 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
-pip install "langgraph-cli[inmem]"
+uv add "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)
@@ -35,7 +53,9 @@ 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)
@@ -47,7 +67,9 @@ 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)
@@ -56,7 +78,9 @@ 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
@@ -68,18 +92,18 @@ The CLI uses a `langgraph.json` configuration file with these key settings:
 
 ```json
 {
-  "dependencies": ["langchain_openai", "./your_package"],  // Required: Package dependencies
+  "dependencies": ["langchain_openai", "./your_package"],
   "graphs": {
-    "my_graph": "./your_package/file.py:graph"            // Required: Graph definitions
+    "my_graph": "./your_package/file.py:graph"
   },
-  "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
+  "env": "./.env",
+  "python_version": "3.11",
+  "pip_config_file": "./pip.conf",
+  "dockerfile_lines": []
 }
 ```
 
-See the [full documentation](https://langchain-ai.github.io/langgraph/cloud/reference/cli/) for detailed configuration options.
+See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.
 
 ## Development
 
@@ -87,19 +111,26 @@ To develop the CLI itself:
 
 1. Clone the repository
 2. Navigate to the CLI directory: `cd libs/cli`
-3. Install development dependencies: `uv pip install`
+3. Install development dependencies: `uv sync`
 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
-   ```
 
-## License
+```bash
+# Run CLI commands directly
+uv run langgraph --help
 
-This project is licensed under the terms specified in the repository's LICENSE file.
+# 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).

libs/cli/examples/graph_prerelease_reqs/pyproject.toml

@@ -6,7 +6,7 @@ readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
   "langchain-openai==1.1.14",
-  "langchain-anthropic==1.0.0a5",
+  "langchain-anthropic==1.4.6",
   "langgraph==1.1.5"
 ]
 

libs/cli/examples/graphs/storm.py

@@ -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.dict(exclude={"type"}))
+            message = HumanMessage(**message.model_dump(exclude={"type"}))
         converted.append(message)
     return {"messages": converted}
 

libs/cli/js-examples/README.md

@@ -10,7 +10,7 @@ This template demonstrates a simple chatbot implemented using [LangGraph.js](htt
 
 The core logic, defined in `src/agent/graph.ts`, showcases a straightforward chatbot that responds to user queries while maintaining context from previous messages.
 
-## What it does
+## 🤔 What is this?
 
 The simple chatbot:
 
@@ -20,6 +20,10 @@ The simple chatbot:
 
 This template provides a foundation that can be easily customized and extended to create more complex conversational agents.
 
+## 📖 Documentation
+
+For JavaScript and TypeScript documentation, see the [LangGraph.js docs](https://docs.langchain.com/oss/javascript/langgraph/overview). LangGraph Studio also integrates with [LangSmith](https://smith.langchain.com/) for tracing and collaboration with teammates.
+
 ## Getting Started
 
 Assuming you have already [installed LangGraph Studio](https://github.com/langchain-ai/langgraph-studio?tab=readme-ov-file#download), to set up:

libs/cli/js-examples/package.json

@@ -21,25 +21,28 @@
     "test:all": "yarn test && yarn test:int && yarn lint:langgraph"
   },
   "dependencies": {
-    "@langchain/core": "^1.1.48",
-    "@langchain/langgraph": "^1.3.3"
+    "@langchain/core": "^1.2.4",
+    "@langchain/langgraph": "^1.4.8"
+  },
+  "resolutions": {
+    "@langchain/langgraph-checkpoint": "1.0.4"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3.3.5",
+    "@eslint/eslintrc": "^3.3.6",
     "@eslint/js": "^10.0.1",
     "@tsconfig/recommended": "^1.0.13",
     "@types/jest": "^30.0.0",
-    "@typescript-eslint/eslint-plugin": "^8.60.1",
-    "@typescript-eslint/parser": "^8.60.1",
+    "@typescript-eslint/eslint-plugin": "^8.65.0",
+    "@typescript-eslint/parser": "^8.65.0",
     "dotenv": "^17.4.2",
-    "eslint": "^10.4.1",
+    "eslint": "^10.8.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-no-instanceof": "^1.0.1",
     "eslint-plugin-prettier": "^5.5.6",
     "jest": "^30.4.2",
-    "prettier": "^3.8.3",
-    "ts-jest": "^29.4.11",
-    "typescript": "^6.0.3"
+    "prettier": "^3.9.6",
+    "ts-jest": "^29.4.12",
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/apps/agent/package.json

@@ -9,10 +9,10 @@
   },
   "dependencies": {
     "@js-monorepo-example/shared": "*",
-    "@langchain/core": "^1.1.48",
-    "@langchain/langgraph": "^1.3.3"
+    "@langchain/core": "^1.2.4",
+    "@langchain/langgraph": "^1.4.8"
   },
   "devDependencies": {
-    "typescript": "^6.0.3"
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/libs/shared/package.json

@@ -9,6 +9,6 @@
     "clean": "rm -rf dist"
   },
   "devDependencies": {
-    "typescript": "^6.0.3"
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/package.json

@@ -17,18 +17,18 @@
     "lint": "eslint 'apps/**/*.ts' 'libs/**/*.ts'"
   },
   "devDependencies": {
-    "turbo": "^2.9.16",
-    "typescript": "^6.0.3",
+    "turbo": "^2.10.8",
+    "typescript": "^7.0.2",
     "@tsconfig/recommended": "^1.0.13",
-    "@eslint/eslintrc": "^3.3.5",
+    "@eslint/eslintrc": "^3.3.6",
     "@eslint/js": "^10.0.1",
-    "eslint": "^10.4.1",
+    "eslint": "^10.8.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.27.5",
     "eslint-plugin-no-instanceof": "^1.0.1",
     "eslint-plugin-prettier": "^5.5.6",
-    "@typescript-eslint/eslint-plugin": "^8.60.1",
-    "@typescript-eslint/parser": "^8.60.1",
-    "prettier": "^3.8.3"
+    "@typescript-eslint/eslint-plugin": "^8.65.0",
+    "@typescript-eslint/parser": "^8.65.0",
+    "prettier": "^3.9.6"
   }
 }

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

@@ -28,10 +28,10 @@
     debug "^4.3.1"
     minimatch "^10.2.4"
 
-"@eslint/config-helpers@^0.6.0":
-  version "0.6.0"
-  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.6.0.tgz#ef9a36881d39dfd5dbeac22b0da997fabfb08b03"
-  integrity sha512-ii6Bw9jJ2zi2cWA2Z+9/QZ/+3DX6kwaV5Q986D/CdP3Lap3w/pgQZ373FV7byY/i7L4IRH/G43I5dz1ClsCbpA==
+"@eslint/config-helpers@^0.7.0":
+  version "0.7.0"
+  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.7.0.tgz#09ee4aa07b73f059ec2d4c74bf4b2ff02b322377"
+  integrity sha512-DObd/KKUsU+FaFv4PLxSRenpXfQWmPXXP3pPZ6/K1PCrMu2vQpMDMuQe/BqYeoLcz8ro0bVDF1RxOJgfVEdhUw==
   dependencies:
     "@eslint/core" "^1.2.1"
 
@@ -42,10 +42,10 @@
   dependencies:
     "@types/json-schema" "^7.0.15"
 
-"@eslint/eslintrc@^3.3.5":
-  version "3.3.5"
-  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.3.5.tgz#c131793cfc1a7b96f24a83e0a8bbd4b881558c60"
-  integrity sha512-4IlJx0X0qftVsN5E+/vGujTRIFtwuLbNsVUe7TO6zYPDR1O6nFwvwhIKEKSrl6dZchmYBITazxKoUYOjdtjlRg==
+"@eslint/eslintrc@^3.3.6":
+  version "3.3.6"
+  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.3.6.tgz#d22bfd6b3a7d8e1f2c0b2f2e6de111b53ec6e13e"
+  integrity sha512-l2Ul9PrHsPCKcEY/ac7VgFj9D80C7S68sOKc618SyHDPK36s1XcFebXY0iTzUVn4Yq+YbwvSnDmCz9yxjX+QrA==
   dependencies:
     ajv "^6.14.0"
     debug "^4.3.2"
@@ -53,7 +53,7 @@
     globals "^14.0.0"
     ignore "^5.2.0"
     import-fresh "^3.2.1"
-    js-yaml "^4.1.1"
+    js-yaml "^4.3.0"
     minimatch "^3.1.5"
     strip-json-comments "^3.1.1"
 
@@ -103,10 +103,10 @@
   resolved "https://registry.yarnpkg.com/@isaacs/cliui/-/cliui-9.0.0.tgz#4d0a3f127058043bf2e7ee169eaf30ed901302f3"
   integrity sha512-AokJm4tuBHillT+FpMtxQ60n8ObyXBatq7jD2/JA9dxbDDokKQm8KMht5ibGzLVU9IJDIKK4TPKgMHEYMn3lMg==
 
-"@langchain/core@^1.1.48":
-  version "1.1.48"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.48.tgz#dfe7f6a64b0e3e79e5357ed4b402c021ee315a7f"
-  integrity sha512-fQU6Guyb1pwc2fEplmA8FPbKfOMAofjnyJzExevro0FxEiuGHE18Ov/ZHmT9trWCDTZRI9eW1VIc6aChxV8pAQ==
+"@langchain/core@^1.2.4":
+  version "1.2.4"
+  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.2.4.tgz#3916181e00f93b2e3b5801ab8273c07d144d75ce"
+  integrity sha512-GIrJktdsFPx8gM0C3VyikkeYGZAV7iRIzUJuS5tFatiKLExybou0LI0MuxH9kksN38quyfWdQDl20lIEAEVkVA==
   dependencies:
     "@cfworker/json-schema" "^4.0.2"
     "@standard-schema/spec" "^1.1.0"
@@ -116,39 +116,35 @@
     p-queue "^6.6.2"
     zod "^3.25.76 || ^4"
 
-"@langchain/langgraph-checkpoint@^1.0.4":
-  version "1.0.4"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph-checkpoint/-/langgraph-checkpoint-1.0.4.tgz#893aa7255b2fe810fdeb50281f6750a3b0a6fef7"
-  integrity sha512-1y5MgZ0gXXrtmoy56e3kaBChI3GwFPIKl27xkrHwN+VE/3iUsyr9gO3Jtp7kdKAe6diZGbcas5bdC/r0yUwTZA==
-  dependencies:
-    uuid "^14.0.0"
+"@langchain/langgraph-checkpoint@^1.1.3":
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph-checkpoint/-/langgraph-checkpoint-1.1.3.tgz#891f2f9a2e96cf2ab0920f9240f9ad1e0a86a4ab"
+  integrity sha512-wgzdQNeEsdw1e+4lvlj0tdq/RYR/k1vPin10g0ymGoehZDDgd9nvIllGXSXN4TFgF9sf5qQP/KTkOcLfeseIhA==
 
-"@langchain/langgraph-sdk@~1.9.11":
-  version "1.9.11"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.9.11.tgz#d16f18b2c48e544436489172d86b3c78524eb679"
-  integrity sha512-mhadkZy4LQ97NJwvATiVIkSxVfOnauXNhrVHFgGnzyqr5zzPLS0VIKJW9xKT+pM8yLqW8Qj6+nPPNhwGUaxoRw==
+"@langchain/langgraph-sdk@~1.9.26":
+  version "1.9.28"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.9.28.tgz#1664cc7b6f2c1509ddffecf17d805a26e70a7e1a"
+  integrity sha512-4j3XuM0PvtmAbL8mPfBS99ez3+ytRfgbOpAR/nOeaejTRF3Q9dNw2QnaGLGng8wLPtGLoSj+SYgUOVxy9Bv9vg==
   dependencies:
-    "@langchain/protocol" "^0.0.16"
+    "@langchain/protocol" "^0.0.18"
     "@types/json-schema" "^7.0.15"
     p-queue "^9.0.1"
     p-retry "^7.1.1"
-    uuid "^14.0.0"
 
-"@langchain/langgraph@^1.3.3":
-  version "1.3.3"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.3.3.tgz#c7bb19029e37971116e07101be3d8fd4b6483d50"
-  integrity sha512-8xbpGUQNBcWua7ivT5vUvDnQ+6Qbt0JO8RisgXZ8guPXNqh8plGVvrODW68S4AlJbOYY2yi0ROKtrL/1yN3MBQ==
+"@langchain/langgraph@^1.4.8":
+  version "1.4.8"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.4.8.tgz#65ef5635b5554cd32f502a3808b92d8371998a99"
+  integrity sha512-DN1Np1XefdBEbp1qBKlt39cwoL743AAGpR5Ipja0gY2YbWvsoQnOTIrjnj/orSAhaUYsdTKS8VSWdFzsHZo6Ig==
   dependencies:
-    "@langchain/langgraph-checkpoint" "^1.0.4"
-    "@langchain/langgraph-sdk" "~1.9.11"
-    "@langchain/protocol" "^0.0.16"
+    "@langchain/langgraph-checkpoint" "^1.1.3"
+    "@langchain/langgraph-sdk" "~1.9.26"
+    "@langchain/protocol" "^0.0.18"
     "@standard-schema/spec" "1.1.0"
-    uuid "^14.0.0"
 
-"@langchain/protocol@^0.0.16":
-  version "0.0.16"
-  resolved "https://registry.yarnpkg.com/@langchain/protocol/-/protocol-0.0.16.tgz#68b63d58feaf4f0acf77405cb8fb16f9c3f09b60"
-  integrity sha512-ws+J7MaHyhO5dG7f0vdyHQiUn9hoCnki0f3crJPa4MCTGzcRC39jYSCghyrGtBPYQnZbUQiGyRVpW3z3M8IpJg==
+"@langchain/protocol@^0.0.18":
+  version "0.0.18"
+  resolved "https://registry.yarnpkg.com/@langchain/protocol/-/protocol-0.0.18.tgz#6d96155e7263c958fbce6d4b7241b4725b72fbad"
+  integrity sha512-XW1egQtPfsGI41w2AMZNFZrUIwFSQHTjVMZs0OaTpCAvht/QLoaPN8FQcsysMVypOhupG28J29yOorrc70otBQ==
 
 "@pkgr/core@^0.3.6":
   version "0.3.6"
@@ -170,35 +166,35 @@
   resolved "https://registry.yarnpkg.com/@tsconfig/recommended/-/recommended-1.0.13.tgz#269fce3ad04ca70b93269ff44cca81b950f542da"
   integrity sha512-sySRuBfMKyKO/j2ZAhR8kSembhjuPEV4Ra3AHtmWLq51+iGaudr45crPSzNC5b7/Ctrh9dfUpBuTlYrH6rM58Q==
 
-"@turbo/darwin-64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.9.16.tgz#f4146eab98e020d658a9a5d7feb846acba653546"
-  integrity sha512-jLjApWTSNd7JZ5JaLYfelW1ytnGQOvB7ivl+2RD1xQvJTbi8I9gBjzcga7tDZVPyaxpl10YTfJt3BrYXR18KDw==
+"@turbo/darwin-64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.10.8.tgz#0ae7cde6b95b82b0a4fe406ffea64bdfcf68a0ee"
+  integrity sha512-po+7rfJfUnFXjWlcoN2RwhErgzCdRtBc1T26vYPcywHlggmCQiQe1uWaE4j+BibI2uY9/2pDoFzMN0rmSaPFOw==
 
-"@turbo/darwin-arm64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.9.16.tgz#1d01ca232fc189045d6a4dba4741f462e0343b8c"
-  integrity sha512-YPgrn+5HIGzrx0O2a631SV4MBQUe4W/DafMFUuBVgaU32PW9/OTT0ehviF0QSxTXuRJlHvW2eUTemddF5/spmw==
+"@turbo/darwin-arm64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.10.8.tgz#18a9127c0a0d9c5ad7de49bdb27e7032f8946334"
+  integrity sha512-+zB2btDJ00lnPRuqOvpVvgl4x34k/djZQGZTTCfjn7JgNCl8QFY5Njo5+dqkY1g/+9gbbsnAvWm9CmJg9ebcXA==
 
-"@turbo/linux-64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.9.16.tgz#8db630e6e5681a2ea48f7df1bca57bbd9bdf3e25"
-  integrity sha512-vAEf1H6l26lTpl9FJ/peQo1NUB8RC0sbEJJz5mPcUhHA2bPDup2x3CZPgo/bH8S4cUcBLm4FN3UHd5iUO2RAew==
+"@turbo/linux-64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.10.8.tgz#1677672f5760d272c0a0608686fe8b8b29491fdb"
+  integrity sha512-K1dxqiVisyN7cViVsfQLs6xscQbYuI8aO2nbUhFURDACgEDfZRdP/b4CCxeosBJpcMfhYyiibWqJorCnvz9kKg==
 
-"@turbo/linux-arm64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.9.16.tgz#d1de82fc8075c4774b214dd2f5e8e2570bb03643"
-  integrity sha512-xDBLR2PZg4BrQOchfG6svgpv5FCNJ2TOtT2psLdEJcdKo1BH+pnPs9Xj6pvUjgfkHbuvBOfeE4R6tvxMoQKDHQ==
+"@turbo/linux-arm64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.10.8.tgz#dbdb5aef9e53bb4c88357dafc19f79138ec29253"
+  integrity sha512-Gi77ibVnrE1fEmvr+/wBD/yvRqhwp/RQuCp2+//lv1U1wNFFyVg0V7Wj8FG9FXPFAw5QHReo8rxc9+wBSDZjzA==
 
-"@turbo/windows-64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.9.16.tgz#e369c51edd737978651c2f6b4ce49b582976d66f"
-  integrity sha512-NBAJnaUiGdgkSzQwUIdOvkCkcpTSu58G/sBGa0mvBtzfvFOOgrQwepKOOQ8cp6sWM6OcKDNFj2p1dsZA1OWjPg==
+"@turbo/windows-64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.10.8.tgz#451c3b5421c9ce573c764b1efacae5ad4d1312ee"
+  integrity sha512-znnLO1haJPYTHoKMKwlAvlkjRiYbbhBzME6wIGaMd+fwir23U6jVd1ecaTWWi1fbnRVqxMfgDBKseQ/hLKb83g==
 
-"@turbo/windows-arm64@2.9.16":
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.9.16.tgz#dbb2b2863e80eb9ca8da8bd8da63e2cc457e470c"
-  integrity sha512-Y7SJppD0Z8wjO3Ec0ZGd9KQ4Yv0BMnA8CIowj5Vp+OEVsosXDG2weK6/t1RRLfJmc2Ozrnd6y4DOgQys+mn3WQ==
+"@turbo/windows-arm64@2.10.8":
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.10.8.tgz#5661ca9b75713aece06d319493e48a366a4cd05c"
+  integrity sha512-VN30vh3b3Czh2WzYHNTfF1FE0YMZ5aHsLO8dBMGHJewA6792wX6iJR8ZxlzFW6WdOu0gEAKIvlYhfyT81Wkm4Q==
 
 "@types/esrecurse@^4.3.1":
   version "4.3.1"
@@ -220,102 +216,212 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==
 
-"@typescript-eslint/eslint-plugin@^8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.60.1.tgz#c1060bb8fa4be80624d3f3dec8dd9caca373af76"
-  integrity sha512-JQ4S5GB0tfjO8BuJ4fcX+HodkzJjYBV+7OJ+wLygaX7OGQ7FudyHL4NSCA6ob+w3Yn+5MkKIozOwQhXeM7opVg==
+"@typescript-eslint/eslint-plugin@^8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.65.0.tgz#0a58df6fea8c0bf6b396f518077099bc8b762bb5"
+  integrity sha512-IEgob78X12rHpUmtcwFsXhZdVGJtwTVP8FiCLZkR6GlYVrl2PcuB+KhCE5BlVC/eQpQnu8WXRtkHZuPar+gCRA==
   dependencies:
     "@eslint-community/regexpp" "^4.12.2"
-    "@typescript-eslint/scope-manager" "8.60.1"
-    "@typescript-eslint/type-utils" "8.60.1"
-    "@typescript-eslint/utils" "8.60.1"
-    "@typescript-eslint/visitor-keys" "8.60.1"
+    "@typescript-eslint/scope-manager" "8.65.0"
+    "@typescript-eslint/type-utils" "8.65.0"
+    "@typescript-eslint/utils" "8.65.0"
+    "@typescript-eslint/visitor-keys" "8.65.0"
     ignore "^7.0.5"
     natural-compare "^1.4.0"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/parser@^8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.60.1.tgz#a9d7f30850384d34b41f4687dd8944823c09e289"
-  integrity sha512-A0M6ua6H252bVjPvvtSgl2QA4+ET9S5Mtkb2GDyTxIhH/C4qDItT7RQNO5PhMC6NXGYXOR9dIalcDDgBKT7oFA==
+"@typescript-eslint/parser@^8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.65.0.tgz#5295c1058c0a1dd746ef28baaf9c0341dbdf03dc"
+  integrity sha512-CZ4nMxWwgu1HEEFNkeaCptra9QCtkmKdgf3sWh1rl1trIhmxLilgTV4cwcbQ4wemnT4sWQN8CaKOmdYx+g2gMA==
   dependencies:
-    "@typescript-eslint/scope-manager" "8.60.1"
-    "@typescript-eslint/types" "8.60.1"
-    "@typescript-eslint/typescript-estree" "8.60.1"
-    "@typescript-eslint/visitor-keys" "8.60.1"
+    "@typescript-eslint/scope-manager" "8.65.0"
+    "@typescript-eslint/types" "8.65.0"
+    "@typescript-eslint/typescript-estree" "8.65.0"
+    "@typescript-eslint/visitor-keys" "8.65.0"
     debug "^4.4.3"
 
-"@typescript-eslint/project-service@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.60.1.tgz#eb29712f58d72c222fc727162e92f2ab4670971b"
-  integrity sha512-eXkTH2bxmXlqD1RnOPmLZ9ZM9D3VwSx04JOwBnP9RQ+yUA5a2Mu7SfW8uaV2Aon53NJzZlZYuX7tn91Izf+xaw==
+"@typescript-eslint/project-service@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.65.0.tgz#65fbbc9a1591abffaeab5513200f848271cb0aa5"
+  integrity sha512-SxnPhbTsGahizDgbu7oqFH/xVtzIqMd/s+WtnSxNxJZJpLbdT5IPdzg8EZxO3+PoKahXmwJLeNQOpKJb3/bi7Q==
   dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.60.1"
-    "@typescript-eslint/types" "^8.60.1"
+    "@typescript-eslint/tsconfig-utils" "^8.65.0"
+    "@typescript-eslint/types" "^8.65.0"
     debug "^4.4.3"
 
-"@typescript-eslint/scope-manager@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.60.1.tgz#2f875962eaad0a0789cc3c36aea9b4ddeb2dd9c8"
-  integrity sha512-gvI5OQoptnxQnchOirukCuQ55svJSTuD/4k5+pC267xyBtYry748R9/c3tYUzb/iE6RZfllRz2lVulLCHkTm4w==
+"@typescript-eslint/scope-manager@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.65.0.tgz#9547202ce7e608e7b6283df585703b980a0ea70d"
+  integrity sha512-Esbl8OSYiVxBokYgWPf7VVWg/BE798wXhimnn9ML9Pt5qoDf8bfQlgjlKXR/k98+AcNzlLKYrpCcrcuZ9DZLgg==
   dependencies:
-    "@typescript-eslint/types" "8.60.1"
-    "@typescript-eslint/visitor-keys" "8.60.1"
+    "@typescript-eslint/types" "8.65.0"
+    "@typescript-eslint/visitor-keys" "8.65.0"
 
-"@typescript-eslint/tsconfig-utils@8.60.1", "@typescript-eslint/tsconfig-utils@^8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.60.1.tgz#bee8b942a13679a878101c9c74577d732062ed93"
-  integrity sha512-nh8w4qAteiKuZu3pSSzG/yGKpw0OlkrKnzFmbVRenKaD4qc+7i1GrmZaLVkr8rk4uipiPGMOW4YsM6WmKZ5CvA==
+"@typescript-eslint/tsconfig-utils@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.65.0.tgz#36f168fcdbb1295f7446ff0379667f98c3cf1bf3"
+  integrity sha512-j6GzGqCiRdA7Qhur2VVmKZAkBLfnHFQfx4TaJGL9RMveZqCo48jSHHO0DTgizEnGhtWnqmbtCUSrqSkdiY/0Hg==
 
-"@typescript-eslint/type-utils@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.60.1.tgz#1ae45f0f2a701354beea4a58c2161e40a5e3c379"
-  integrity sha512-sdwTrpjosW7ANQYJ39ZBF1ZyEMEGVB2UsikrserVM/30a/F1dTLnu9bGxEdosugyu5caigjLrR2qiD11asjI1A==
+"@typescript-eslint/tsconfig-utils@^8.65.0":
+  version "8.66.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.66.0.tgz#3a89066c507aa30541dc176804685b4b444e1e52"
+  integrity sha512-9D5gLYZG4rOjcoag8MQ/fWI8WqA9wcPDyOGyWtWFhvM1lHRbliqUSPIY5J3zqCU1tvSwzXxnnjhQhz5Ne7mJ4g==
+
+"@typescript-eslint/type-utils@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.65.0.tgz#d316d7522d93cff4cd14f305e02f3df2d804f9c1"
+  integrity sha512-YjaZ7PRI5qY7ax2L3PbvX0rRyGtipAReCWs0mhhDBHjH/vl0g0BonaGXrKdKpMbIIsMIwDgbk/xzkBTyAltS5g==
   dependencies:
-    "@typescript-eslint/types" "8.60.1"
-    "@typescript-eslint/typescript-estree" "8.60.1"
-    "@typescript-eslint/utils" "8.60.1"
+    "@typescript-eslint/types" "8.65.0"
+    "@typescript-eslint/typescript-estree" "8.65.0"
+    "@typescript-eslint/utils" "8.65.0"
     debug "^4.4.3"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/types@8.60.1", "@typescript-eslint/types@^8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.60.1.tgz#ccdc482ba9e17f9723a10ce240b5e67dad3046c4"
-  integrity sha512-4h0tY8ppCkdCzcrl2YM5M3my0xsE1Tf8om3owEu5oPWmXwkKRmk0j0LGDzYBGUcAlesEbxBhazqu/K4cu3Ug7w==
+"@typescript-eslint/types@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.65.0.tgz#3e86738416a777c8b8925ab46745f48ecf904c9f"
+  integrity sha512-JSSwWNy+H0E/01jJEM+hrX6N0OFDzFzeIhHFSAS01tlVaevpG8cFyYRPhS5yjGOvBUx3sqQHVMjCL1CAZZMxBg==
 
-"@typescript-eslint/typescript-estree@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.60.1.tgz#016630b119228bf483ddc652703a6a038f3fdd74"
-  integrity sha512-alpRkfG8hlVE5kdJW2GkfgDgXxold3e8e4l6EnmhRmRLbekgAPCCGDVD++sABy9FcgPFroq+uFcCSM1vR57Cew==
+"@typescript-eslint/types@^8.65.0":
+  version "8.66.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.66.0.tgz#3cacab94d3b564c1d48c56eb37b89f89a6d48479"
+  integrity sha512-H6gcYaSDOyvL3AD/jHUtUFo2jqGgn/F6nuyuZSu0QTesxL+cP4dQoIMrODRofuJC09g64+WgZ6tE19Y1N2YIFQ==
+
+"@typescript-eslint/typescript-estree@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.65.0.tgz#f1f514808f6aa713e2d678ae8ff592a65e1632af"
+  integrity sha512-JboAE2swaYt4tb1fHhHTABE2K+OLy09XfcTbhnk4Pw96f9dd2e9iYsJ28gBggHlo5z5x1rkyWvcPoTuNTd4oGg==
   dependencies:
-    "@typescript-eslint/project-service" "8.60.1"
-    "@typescript-eslint/tsconfig-utils" "8.60.1"
-    "@typescript-eslint/types" "8.60.1"
-    "@typescript-eslint/visitor-keys" "8.60.1"
+    "@typescript-eslint/project-service" "8.65.0"
+    "@typescript-eslint/tsconfig-utils" "8.65.0"
+    "@typescript-eslint/types" "8.65.0"
+    "@typescript-eslint/visitor-keys" "8.65.0"
     debug "^4.4.3"
     minimatch "^10.2.2"
     semver "^7.7.3"
     tinyglobby "^0.2.15"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/utils@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.60.1.tgz#31cf566095602d9fe8ad91837d2eb520b8de762b"
-  integrity sha512-h2MPBLoNtjc3qZWfY3Tl51yPorQ2McHn8pJfcMNTcIvrrZrr90Ykffit0yjrPFWQcRcUxzH20+6OcVdW4yHtUg==
+"@typescript-eslint/utils@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.65.0.tgz#afedd974a0c8deeef553b509df5800bafd615a72"
+  integrity sha512-gXiwIHsYreboxeJucHKPvgwl7dXt50mF8s1/c00cP/WoVTyWKFdtfhRWwZiXYFU5H2O8vVoSLNrexFZjYS/SGA==
   dependencies:
     "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.60.1"
-    "@typescript-eslint/types" "8.60.1"
-    "@typescript-eslint/typescript-estree" "8.60.1"
+    "@typescript-eslint/scope-manager" "8.65.0"
+    "@typescript-eslint/types" "8.65.0"
+    "@typescript-eslint/typescript-estree" "8.65.0"
 
-"@typescript-eslint/visitor-keys@8.60.1":
-  version "8.60.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.60.1.tgz#165d1d8901137b944efaf18f00ab5ecb57f06995"
-  integrity sha512-EbGRQg4FhrmwLodl+t3JNAnXHWVr9Vp+Zl1QBZVPY4ByfkzIT8cX3K6QWODHtkIZqqJVEWvhHSx3v5PDHsaQag==
+"@typescript-eslint/visitor-keys@8.65.0":
+  version "8.65.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.65.0.tgz#e3704c13cb4a1c22454c1abf28ff4737e15018c6"
+  integrity sha512-8C71BQkGjiMmXtop7pHVJu1l2NNShFdkCyD6a2ezzs5vU/L3LRtb69EtcteFwz0mYMPzIgOw0n6OV4VBUWZd7A==
   dependencies:
-    "@typescript-eslint/types" "8.60.1"
+    "@typescript-eslint/types" "8.65.0"
     eslint-visitor-keys "^5.0.0"
 
+"@typescript/typescript-aix-ppc64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-aix-ppc64/-/typescript-aix-ppc64-7.0.2.tgz#cdc7ce81d60f1e09034960ddfb1fb880d7a776b6"
+  integrity sha512-MTKKkWB7p/0E9xi1d1tHtZ5PiLkGEMIq88pK2CubZjOsLtYTLqhgIgi6zepFa+9GHZ6h05NMCkQxGKiPXMxXtQ==
+
+"@typescript/typescript-darwin-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-darwin-arm64/-/typescript-darwin-arm64-7.0.2.tgz#a55fdfcfa58df58d27db2237cde6a5c1e35a7235"
+  integrity sha512-gowzar9MwS/aRWp6f3a4KUqzRjAZjOsmGNCM6LcTgXum+dBfgsBVMN+AgvOCCbguXyick6LJhpBszxMebJ8syA==
+
+"@typescript/typescript-darwin-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-darwin-x64/-/typescript-darwin-x64-7.0.2.tgz#38d1c9172800a91d707bec64d2a370a016634db4"
+  integrity sha512-SZ9xZInqApNlNGc9s0W1VSsktYSOe9cFqNOIqmN1Gs8SmkjKZYFt017G4VwPxASInODuAdbTW7sXiFUf893RgA==
+
+"@typescript/typescript-freebsd-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-freebsd-arm64/-/typescript-freebsd-arm64-7.0.2.tgz#f1ff8810030b35d2b5be0db6a2dc650460ea94fa"
+  integrity sha512-W5NH4y/J0plIIS5b2xvTEkU7JFxyqdMAOgf+Ilhl0vHQXKO5dZoxd+C/jEtq56c4F3wk71RB4BMRQ2XdI+bwYQ==
+
+"@typescript/typescript-freebsd-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-freebsd-x64/-/typescript-freebsd-x64-7.0.2.tgz#3d86b03f353c5b1ba95162eb6ce35533bfc294bd"
+  integrity sha512-UMGDx5sTpzNw3WiPebH7l90IWfJggEd+egHt/q6p7/Cm3zqoV7VxkGXt+3DxPIw8CcmvAB0j3sVVfbhX+M4Tpw==
+
+"@typescript/typescript-linux-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-arm64/-/typescript-linux-arm64-7.0.2.tgz#d9334d96d6dac6ff85da9c865588948de939e91f"
+  integrity sha512-Qh4eU4/y3yDjnfjjyPYihMj5/ODIlmt+Bzu17OI+fiSRDW57QmU5SiN63exPRNJPKUzcc1INa1NXdrJ+MqHjUQ==
+
+"@typescript/typescript-linux-arm@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-arm/-/typescript-linux-arm-7.0.2.tgz#ad94b41e1aee2a4dcc6a298c7b67c43345fde32e"
+  integrity sha512-gffT3xPz9sR7j/YJExkyPntrI0P2EP9XbOyWzth2/Gs0RstK+90RBcO0ncXoXy/beYll1SXw846Nf2zdnEz0QQ==
+
+"@typescript/typescript-linux-loong64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-loong64/-/typescript-linux-loong64-7.0.2.tgz#2965aee4fc873360139d893daafe6397a29138ad"
+  integrity sha512-uEHck9i8hoAzXPiYRib1O7miOnz23SxIeVl6F4LXox+qov1K35jHcEW6VHKvZI+pyvl7fZEP4MCU5LYvIq1GuQ==
+
+"@typescript/typescript-linux-mips64el@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-mips64el/-/typescript-linux-mips64el-7.0.2.tgz#1a887a311bed3a833f80bfd4a9ed37c271936cf0"
+  integrity sha512-R4KvAMnE43W5Qeqb0Ly56O3mWMWIAgsMyz36DCaycd5nbg/9kzm0liw3JocfRqyJY0KPmzFjbswozXyW0DnIYA==
+
+"@typescript/typescript-linux-ppc64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-ppc64/-/typescript-linux-ppc64-7.0.2.tgz#8b63c9b2f445b393eb4e43ec21da225dade3577d"
+  integrity sha512-DORx5b3sd/4S7eayxm4FQv+A7CrkUIGRaHiwI8oiHTAI1fAPWhF4J0vAlkC8biAlHSVVwxMQ3tjZ2/DVbnQiiA==
+
+"@typescript/typescript-linux-riscv64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-riscv64/-/typescript-linux-riscv64-7.0.2.tgz#b6e8a35c289b3ea97a92a41d461aaeed0d3b36e1"
+  integrity sha512-wf0jqEDOjrPRnKwYRyyJDRo11KMbvMFrU+q4zqKyChODBzvlkbhNQfKvLxQCcwTpdDaXSHZTVuh0JoCrKCUMHQ==
+
+"@typescript/typescript-linux-s390x@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-s390x/-/typescript-linux-s390x-7.0.2.tgz#2ef96693be4861f6d17965427e5b009cbbed1a3e"
+  integrity sha512-IkwJc3L7yhytWd/ewjyxNDfOmswCm9GWMJT/ue/dU4aZNbwZeYAetq42VyLmsmSjvoX7z74X6ZaYCtzAr0EuGw==
+
+"@typescript/typescript-linux-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-linux-x64/-/typescript-linux-x64-7.0.2.tgz#73269cb0baba50aea0ca060445a6b88e583f1ce2"
+  integrity sha512-EYdf2cNg7rgCWJnxCdJ+F3V39O8ihb37eHAu1LK8oAFizgTQbPOK7zHHXbPt8rX24COqODXeI3sIf0fCXG7H/A==
+
+"@typescript/typescript-netbsd-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-netbsd-arm64/-/typescript-netbsd-arm64-7.0.2.tgz#3a3649f97fafa210b4e6e3798c15e06605c8a901"
+  integrity sha512-+polYF4MF04aPpO5FTkHran9yUQDSXqy5GiSDKpsll5jy3l3+g9QLhpf39T+ePtefhXLOGrLl0QIjkQP6VnelA==
+
+"@typescript/typescript-netbsd-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-netbsd-x64/-/typescript-netbsd-x64-7.0.2.tgz#47ec59491a40c470d2807dc4d2b825528fd979ab"
+  integrity sha512-8YIT0EHM/3dq10ZOVF/A7pc/YSMtbcecct4rWtexrnSCHOPcpC2KTLXfTCR6vDpnSiY12heNb1GiN/wu+T/FyA==
+
+"@typescript/typescript-openbsd-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-openbsd-arm64/-/typescript-openbsd-arm64-7.0.2.tgz#796be8da0bd989d8a3fb96f2801e38a8365b4baf"
+  integrity sha512-APT8+ClYnuYm1u9+kgGXoMj2VzWzcymwh2gNSQVySHfkRDGOTVkoWLjCmOQSaO+PoqQ57B0flRp9SA+7GnnkzQ==
+
+"@typescript/typescript-openbsd-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-openbsd-x64/-/typescript-openbsd-x64-7.0.2.tgz#d37fe2a729eb942c076c454ee7f1815faf7d560f"
+  integrity sha512-yX7s+Q0Dln0Dt9tEzZsAjXXR/+ytBM7AlglaqyeMPxQszJ1JhlJdZ6jLA+IzldHtflX81em7lDao1xXu+aRRkg==
+
+"@typescript/typescript-sunos-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-sunos-x64/-/typescript-sunos-x64-7.0.2.tgz#aba8d3464c3565a7044789baba96916bd4ab2c88"
+  integrity sha512-dLJDGaLZ1D4HPQn62u1n8mBDkJREwMsAkCdkwd4Ieqw+x3TUyTsqY0YiBCtE6H6OzzgGk3iuZ3vFWRS+E8/d1g==
+
+"@typescript/typescript-win32-arm64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-win32-arm64/-/typescript-win32-arm64-7.0.2.tgz#b9de50a17196383f62620b5f9d0a2f34ad3b60d7"
+  integrity sha512-Gyl1Vy6OsWesLzmq+EP0Fb7b4Nid5232AvcA2SFcdYreldpNtYFFofPjnt62y9hQy7VTaZp65ICJjuAQRaVcIQ==
+
+"@typescript/typescript-win32-x64@7.0.2":
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/@typescript/typescript-win32-x64/-/typescript-win32-x64-7.0.2.tgz#cf3b7b0d6ce5635daca4c8e01c189cdcde47ec3c"
+  integrity sha512-0BQ3HkAHHlKLSp1qRvf3SUhGpGsDuhB/jgFw75guyqbxJqEaS0Cw/VFO8i2nHglJUzQCRtMMR/IBAKE3ETMC4g==
+
 acorn-jsx@^5.3.2:
   version "5.3.2"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
@@ -451,10 +557,10 @@ brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-brace-expansion@^5.0.2:
-  version "5.0.2"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-5.0.2.tgz#b6c16d0791087af6c2bc463f52a8142046c06b6f"
-  integrity sha512-Pdk8c9poy+YhOgVWw1JNN22/HcivgKWwpxKq04M/jTmHyCZn12WPJebZxdjSa5TmBqISrUSgNYU3eRORljfCCw==
+brace-expansion@^5.0.8:
+  version "5.0.9"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-5.0.9.tgz#7c72438809b5fa5babf54199a1f1c281a6984fcf"
+  integrity sha512-ScQ4IuvIEF1TMlP7Zt+vjJ//9zlPb2SDcxWxM3bk8s6t6GGdJ7KO1dCcTidOPJKePW30LE/2cT7wCyPho9/Wxg==
   dependencies:
     balanced-match "^4.0.2"
 
@@ -775,15 +881,15 @@ eslint-visitor-keys@^5.0.0, eslint-visitor-keys@^5.0.1:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-5.0.1.tgz#9e3c9489697824d2d4ce3a8ad12628f91e9f59be"
   integrity sha512-tD40eHxA35h0PEIZNeIjkHoDR4YjjJp34biM0mDvplBe//mB+IHCqHDGV7pxF+7MklTvighcCPPZC7ynWyjdTA==
 
-eslint@^10.4.1:
-  version "10.4.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.4.1.tgz#f6640b176e0912246d9ddbf8fcfa5e8b7f02445a"
-  integrity sha512-AyIKhnOBuOAdueD7RB3xB+YeAWScb9jHsJBgH2Hcde8InP5JYhqrRR6iTMHyTEwgENK54Cp44e4v8BwNhsuHuw==
+eslint@^10.8.0:
+  version "10.8.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.8.0.tgz#e6d19907a3f090a53a022261ba34c5ff6d04908b"
+  integrity sha512-nuKKvN+oIBO0koN7Tm7dlkmnkc21mtt0QJLwAKzjLq14y6lRTdVG36MZHJ8eQHwdJMwZbQNMlPOYedMq/oVJvQ==
   dependencies:
     "@eslint-community/eslint-utils" "^4.8.0"
     "@eslint-community/regexpp" "^4.12.2"
     "@eslint/config-array" "^0.23.5"
-    "@eslint/config-helpers" "^0.6.0"
+    "@eslint/config-helpers" "^0.7.0"
     "@eslint/core" "^1.2.1"
     "@eslint/plugin-kit" "^0.7.2"
     "@humanfs/node" "^0.16.6"
@@ -807,7 +913,7 @@ eslint@^10.4.1:
     imurmurhash "^0.1.4"
     is-glob "^4.0.0"
     json-stable-stringify-without-jsonify "^1.0.1"
-    minimatch "^10.2.4"
+    minimatch "^10.2.5"
     natural-compare "^1.4.0"
     optionator "^0.9.3"
 
@@ -1279,10 +1385,10 @@ js-tiktoken@^1.0.12:
   dependencies:
     base64-js "^1.5.1"
 
-js-yaml@^4.1.1:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.1.1.tgz#854c292467705b699476e1a2decc0c8a3458806b"
-  integrity sha512-qQKT4zQxXl8lLwBtHMWwaTcGfFOZviOJet3Oy/xmGk2gZH677CJM9EvtfdSkgWcATZhj/55JZ0rmy3myCT5lsA==
+js-yaml@^4.3.0:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.3.1.tgz#01216c001d67f48e2cd560d708c7af21090a3848"
+  integrity sha512-CY6crGq313MX8GkwvB7tzgp99vjQxY1++5y10/BKN/GUfHqWaOGQMNZkBvqSzsZKWk/ijwHlWzzkLulsGHhjWQ==
   dependencies:
     argparse "^2.0.1"
 
@@ -1342,12 +1448,12 @@ math-intrinsics@^1.1.0:
   resolved "https://registry.yarnpkg.com/math-intrinsics/-/math-intrinsics-1.1.0.tgz#a0dd74be81e2aa5c2f27e65ce283605ee4e2b7f9"
   integrity sha512-/IXtbwEk5HTPyEwyKX6hGkYXxM9nbj64B+ilVJnC/R6B0pH5G4V3b0pVbL7DBj4tkhBAppbQUlf6F6Xl9LHu1g==
 
-minimatch@^10.2.2, minimatch@^10.2.4:
-  version "10.2.4"
-  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-10.2.4.tgz#465b3accbd0218b8281f5301e27cedc697f96fde"
-  integrity sha512-oRjTw/97aTBN0RHbYCdtF1MQfvusSIBQM0IZEgzl6426+8jSC0nF1a/GmnVLpfB9yyr6g6FTqWqiZVbxrtaCIg==
+minimatch@^10.2.2, minimatch@^10.2.4, minimatch@^10.2.5:
+  version "10.2.6"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-10.2.6.tgz#fd956bbe0b77241e9f15ac5dccb1c638060968ef"
+  integrity sha512-vpLQEs+VLCr1nU0BXS07maYoFwlDAH0gngQuuttxIwutDFEMHq2blX+8vpgxDdK3J1PwjCJiep77OitTZ4Ll1A==
   dependencies:
-    brace-expansion "^5.0.2"
+    brace-expansion "^5.0.8"
 
 minimatch@^3.1.2, minimatch@^3.1.5:
   version "3.1.5"
@@ -1546,10 +1652,10 @@ prettier-linter-helpers@^1.0.1:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^3.8.3:
-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.3.tgz#560f2de55bf01b4c0503bc629d5df99b9a1d09b0"
-  integrity sha512-7igPTM53cGHMW8xWuVTydi2KO233VFiTNyF5hLJqpilHfmn8C8gPf+PS7dUT64YcXFbiMGZxS9pCSxL/Dxm/Jw==
+prettier@^3.9.6:
+  version "3.9.6"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.9.6.tgz#b3ea5146515d40fc53f18aa63f74dfab1e10dbf6"
+  integrity sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==
 
 punycode@^2.1.0:
   version "2.3.1"
@@ -1802,17 +1908,17 @@ tsconfig-paths@^3.15.0:
     minimist "^1.2.6"
     strip-bom "^3.0.0"
 
-turbo@^2.9.16:
-  version "2.9.16"
-  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.9.16.tgz#ed72ff679c2c54bde0e3a2e40107416181e203a4"
-  integrity sha512-NqgRQy6j6dPYcdSdv0q1g9QsZg7SWg87RERM8otw/1AtKU2yTFVClOM7cbwKzOonZr/Ek1blTBucw64L9H0Bwg==
+turbo@^2.10.8:
+  version "2.10.8"
+  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.10.8.tgz#09457cb7db79710586da455a29bccc05f15b1b72"
+  integrity sha512-9+8YX5QOkGXzZxcIykTHgaooRHGMWO+jfdyRK0o+rN0U7hBIig2MrJ8r/aNzIPDPhdA73SGb0O+tIztaModTMg==
   optionalDependencies:
-    "@turbo/darwin-64" "2.9.16"
-    "@turbo/darwin-arm64" "2.9.16"
-    "@turbo/linux-64" "2.9.16"
-    "@turbo/linux-arm64" "2.9.16"
-    "@turbo/windows-64" "2.9.16"
-    "@turbo/windows-arm64" "2.9.16"
+    "@turbo/darwin-64" "2.10.8"
+    "@turbo/darwin-arm64" "2.10.8"
+    "@turbo/linux-64" "2.10.8"
+    "@turbo/linux-arm64" "2.10.8"
+    "@turbo/windows-64" "2.10.8"
+    "@turbo/windows-arm64" "2.10.8"
 
 type-check@^0.4.0, type-check@~0.4.0:
   version "0.4.0"
@@ -1866,10 +1972,31 @@ typed-array-length@^1.0.7:
     possible-typed-array-names "^1.0.0"
     reflect.getprototypeof "^1.0.6"
 
-typescript@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-6.0.3.tgz#90251dc007916e972786cb94d74d15b185577d21"
-  integrity sha512-y2TvuxSZPDyQakkFRPZHKFm+KKVqIisdg9/CZwm9ftvKXLP8NRWj38/ODjNbr43SsoXqNuAisEf1GdCxqWcdBw==
+typescript@^7.0.2:
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-7.0.2.tgz#9ec773d7954a8c182c17cc5bbd575aa28bc51582"
+  integrity sha512-8FYau96o3NKOhbjKi/qNvG/W5jhzxkbdm5sj9AbZ/5T5sWqn3hJgLfGx27sRKZWTvyzCP8dLRBTf5tBTSRVUNA==
+  optionalDependencies:
+    "@typescript/typescript-aix-ppc64" "7.0.2"
+    "@typescript/typescript-darwin-arm64" "7.0.2"
+    "@typescript/typescript-darwin-x64" "7.0.2"
+    "@typescript/typescript-freebsd-arm64" "7.0.2"
+    "@typescript/typescript-freebsd-x64" "7.0.2"
+    "@typescript/typescript-linux-arm" "7.0.2"
+    "@typescript/typescript-linux-arm64" "7.0.2"
+    "@typescript/typescript-linux-loong64" "7.0.2"
+    "@typescript/typescript-linux-mips64el" "7.0.2"
+    "@typescript/typescript-linux-ppc64" "7.0.2"
+    "@typescript/typescript-linux-riscv64" "7.0.2"
+    "@typescript/typescript-linux-s390x" "7.0.2"
+    "@typescript/typescript-linux-x64" "7.0.2"
+    "@typescript/typescript-netbsd-arm64" "7.0.2"
+    "@typescript/typescript-netbsd-x64" "7.0.2"
+    "@typescript/typescript-openbsd-arm64" "7.0.2"
+    "@typescript/typescript-openbsd-x64" "7.0.2"
+    "@typescript/typescript-sunos-x64" "7.0.2"
+    "@typescript/typescript-win32-arm64" "7.0.2"
+    "@typescript/typescript-win32-x64" "7.0.2"
 
 unbox-primitive@^1.1.0:
   version "1.1.0"
@@ -1888,11 +2015,6 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-uuid@^14.0.0:
-  version "14.0.0"
-  resolved "https://registry.yarnpkg.com/uuid/-/uuid-14.0.0.tgz#0af883220163d264ffe0c084f6b8a89b9666966d"
-  integrity sha512-Qo+uWgilfSmAhXCMav1uYFynlQO7fMFiMVZsQqZRMIXp0O7rR7qjkj+cPvBHLgBqi960QCoo/PH2/6ZtVqKvrg==
-
 which-boxed-primitive@^1.1.0, which-boxed-primitive@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/which-boxed-primitive/-/which-boxed-primitive-1.1.1.tgz#d76ec27df7fa165f18d5808374a5fe23c29b176e"

libs/cli/langgraph_cli/__init__.py

@@ -1 +1 @@
-__version__ = "0.4.29"
+__version__ = "0.4.31"

libs/cli/langgraph_cli/cli.py

@@ -159,7 +159,14 @@ OPT_POSTGRES_URI = click.option(
 OPT_API_VERSION = click.option(
     "--api-version",
     type=str,
-    help="API server version to use for the base image. If unspecified, the latest version will be used.",
+    help=(
+        "API server version to use for the base image. If unspecified, the "
+        "latest stable version will be used. Compatible ranges like "
+        "~=0.11.0.dev5 stay on 0.11.0.dev5 while only newer dev builds exist, "
+        "then resolve to the newest matching rc or stable release, for example "
+        "0.11.0rc1 or 0.11.0. Stable-floating ranges like >~=0.11.0.dev5 "
+        "can also pick up future stable releases, for example 0.12.0."
+    ),
 )
 
 OPT_ENGINE_RUNTIME_MODE = click.option(

libs/cli/langgraph_cli/config.py

@@ -9,6 +9,7 @@ from collections import Counter
 from typing import Literal, NamedTuple
 
 import click
+import httpx
 
 from langgraph_cli.schemas import Config, Distros
 from langgraph_cli.uv_lock import python_config_to_docker_uv_lock
@@ -41,6 +42,31 @@ _API_VERSION_PATTERN = re.compile(
     r"(?:\.(?P<patch>\d+))?"
     r"(?:(?:\.|)(?:[A-Za-z][0-9A-Za-z]*))?$"
 )
+_API_VERSION_RANGE_PATTERN = re.compile(r"^(?P<operator>~=|>~=)\s*(?P<version>.+)$")
+_API_VERSION_PART_PATTERN = re.compile(
+    r"^(?P<major>\d+)"
+    r"(?:\.(?P<minor>\d+))?"
+    r"(?:\.(?P<patch>\d+))?"
+    r"(?:(?:\.|)(?P<pre>dev|rc)(?P<pre_n>\d+))?$"
+)
+
+
+class _ParsedApiVersion(NamedTuple):
+    release: tuple[int, ...]
+    prerelease: str | None
+    prerelease_number: int
+
+
+class _ApiVersionRange(NamedTuple):
+    floor: _ParsedApiVersion
+    allow_future_stable: bool
+
+
+_PRERELEASE_ORDER = {
+    "dev": 0,
+    "rc": 1,
+    None: 2,
+}
 
 
 def has_disallowed_build_command_content(command: str) -> bool:
@@ -141,6 +167,133 @@ def _parse_api_version_parts(version_str: str) -> tuple[int, ...]:
     return tuple(int(part) for part in match.groups() if part is not None)
 
 
+def _parse_api_version(version_str: str) -> _ParsedApiVersion:
+    match = _API_VERSION_PART_PATTERN.fullmatch(version_str)
+    if not match:
+        raise ValueError("Version must be major or major.minor or major.minor.patch.")
+    release = tuple(
+        int(part)
+        for part in (
+            match.group("major"),
+            match.group("minor"),
+            match.group("patch"),
+        )
+        if part is not None
+    )
+    prerelease = match.group("pre")
+    prerelease_number = int(match.group("pre_n") or 0)
+    return _ParsedApiVersion(release, prerelease, prerelease_number)
+
+
+def _api_version_sort_key(
+    version: _ParsedApiVersion,
+) -> tuple[tuple[int, ...], int, int]:
+    return (
+        version.release,
+        _PRERELEASE_ORDER[version.prerelease],
+        version.prerelease_number,
+    )
+
+
+def _api_version_upper_bound(version: _ParsedApiVersion) -> tuple[int, ...]:
+    release = version.release
+    if len(release) <= 2:
+        return (release[0] + 1,)
+    return (release[0], release[1] + 1)
+
+
+def _is_compatible_api_version_candidate(
+    candidate: _ParsedApiVersion,
+    version_range: _ApiVersionRange,
+    upper_bound: tuple[int, ...],
+) -> bool:
+    floor = version_range.floor
+    if _api_version_sort_key(candidate) < _api_version_sort_key(floor):
+        return False
+    outside_compatible_range = candidate.release[: len(upper_bound)] >= upper_bound
+    if outside_compatible_range and not version_range.allow_future_stable:
+        return False
+    if outside_compatible_range and candidate.prerelease is not None:
+        return False
+    if floor.prerelease == "dev" and candidate.prerelease == "dev":
+        return candidate == floor
+    return True
+
+
+def _ensure_compatible_api_version_base_image(base_image: str) -> None:
+    if ":" in base_image:
+        raise click.UsageError(
+            "Compatible api_version ranges cannot be used with a tagged base_image."
+        )
+
+
+def _get_pypi_versions(package_name: str) -> list[str]:
+    try:
+        response = httpx.get(
+            f"https://pypi.org/pypi/{package_name}/json",
+            timeout=10,
+        )
+        response.raise_for_status()
+    except httpx.HTTPError as exc:
+        raise click.UsageError(
+            f"Failed to fetch PyPI versions for {package_name}: {exc}"
+        ) from None
+    payload = response.json()
+    releases = payload.get("releases", {})
+    if not isinstance(releases, dict):
+        raise click.UsageError(
+            f"Failed to fetch PyPI versions for {package_name}: invalid response."
+        )
+    return [version for version in releases if isinstance(version, str)]
+
+
+def _resolve_compatible_api_version(
+    api_version: str,
+    base_image: str,
+    version_distro_tag: str,
+) -> str:
+    match = _API_VERSION_RANGE_PATTERN.fullmatch(api_version)
+    if not match:
+        return api_version
+
+    floor_str = match.group("version").strip()
+    try:
+        floor = _parse_api_version(floor_str)
+    except ValueError:
+        raise click.UsageError(
+            f"Invalid compatible api_version range: {api_version}.\n\n"
+            "Use a compatible version range, e.g.:\n"
+            '  "api_version": "~=0.11.0.dev5"\n'
+            "or a stable-floating range, e.g.:\n"
+            '  "api_version": ">~=0.11.0.dev5"'
+        ) from None
+
+    version_range = _ApiVersionRange(
+        floor=floor,
+        allow_future_stable=match.group("operator") == ">~=",
+    )
+    _ensure_compatible_api_version_base_image(base_image)
+    pypi_versions = _get_pypi_versions("langgraph-api")
+
+    candidates: list[tuple[_ParsedApiVersion, str]] = []
+    upper_bound = _api_version_upper_bound(floor)
+    for candidate_str in pypi_versions:
+        try:
+            candidate = _parse_api_version(candidate_str)
+        except ValueError:
+            continue
+        if _is_compatible_api_version_candidate(candidate, version_range, upper_bound):
+            candidates.append((candidate, candidate_str))
+
+    if not candidates:
+        raise click.UsageError(
+            f"No PyPI releases match compatible api_version range {api_version!r} "
+            f"for {base_image} with {version_distro_tag!r}."
+        )
+
+    return max(candidates, key=lambda item: _api_version_sort_key(item[0]))[1]
+
+
 def _is_node_graph(spec: str | dict) -> bool:
     """Check if a graph is a Node.js graph based on the file extension."""
     if isinstance(spec, dict):
@@ -194,7 +347,12 @@ def validate_config(config: Config) -> Config:
             )
     if api_version:
         try:
-            parts = _parse_api_version_parts(api_version)
+            compatible_match = _API_VERSION_RANGE_PATTERN.fullmatch(api_version)
+            parts = _parse_api_version_parts(
+                compatible_match.group("version").strip()
+                if compatible_match
+                else api_version
+            )
             if len(parts) > 3:
                 raise ValueError(
                     "Version must be major or major.minor or major.minor.patch."
@@ -1430,6 +1588,9 @@ def docker_tag(
 
     # Prepend API version if provided
     if api_version:
+        api_version = _resolve_compatible_api_version(
+            api_version, base_image, f"{language}{version_distro_tag}"
+        )
         full_tag = f"{api_version}-{language}{version_distro_tag}"
     elif "/langgraph-server" in base_image and version_distro_tag not in base_image:
         return f"{base_image}-{language}{version_distro_tag}"

libs/cli/langgraph_cli/deploy.py

@@ -366,6 +366,42 @@ def normalize_image_tag(value: str) -> str:
     return value
 
 
+def _validate_prebuilt_image(runner, image: str, *, verbose: bool) -> None:
+    """Ensure a prebuilt image exists locally for linux/amd64."""
+    try:
+        stdout, _ = runner.run(
+            subp_exec(
+                "docker",
+                "image",
+                "inspect",
+                "--format",
+                "{{.Os}}/{{.Architecture}}",
+                image,
+                verbose=verbose,
+                collect=True,
+            )
+        )
+    except FileNotFoundError:
+        raise click.ClickException(
+            "Docker is required but not installed.\n"
+            "Install Docker Desktop: https://docs.docker.com/get-docker/"
+        ) from None
+    except click.exceptions.Exit:
+        raise click.ClickException(
+            f"Docker image '{image}' was not found locally. Build or pull the image "
+            "before deploying with --image."
+        ) from None
+
+    image_platform = (stdout or "").strip()
+    if image_platform != "linux/amd64":
+        detected = image_platform or "unknown"
+        raise click.ClickException(
+            f"Docker image '{image}' targets {detected}, but LangSmith Deployment "
+            "requires linux/amd64. Rebuild or pull the image for linux/amd64 before "
+            "deploying with --image."
+        )
+
+
 def _extract_deployment_url(deployment: dict[str, object]) -> str:
     source_config = deployment.get("source_config")
     if isinstance(source_config, dict):
@@ -525,12 +561,18 @@ def _secrets_from_env(
 
 def _resolve_build_mode(
     remote_build_flag: bool | None,
+    *,
+    force_local: bool = False,
 ) -> tuple[bool, str | None]:
     """Determine whether to use a remote build.
 
     Returns (use_remote_build, local_build_error).  Raises UsageError when
-    --no-remote is set but the machine cannot build locally.
+    --no-remote is set but the machine cannot build locally. When
+    `force_local` is set, the function short-circuits and always selects a
+    local build.
     """
+    if force_local:
+        return False, None
     local_build_supported, local_build_error = can_build_locally()
 
     if remote_build_flag is True:
@@ -897,6 +939,7 @@ def _run_local_build(
     api_version: str | None,
     base_image: str | None,
     image_name: str | None,
+    prebuilt_image: str | None,
     name: str | None,
     tag: str,
     install_command: str | None,
@@ -910,51 +953,57 @@ def _run_local_build(
     # (e.g. Apple Silicon). On amd64 hosts, plain docker build is sufficient.
     needs_buildx = platform.machine() != "x86_64"
     local_tag = f"langgraph-deploy-tmp:{int(time.time())}"
+    image_to_push = prebuilt_image or local_tag
 
     with Runner() as runner:
-        # -- Step: Build image --
-        _log_deploy_step(step, "Building image")
-        if needs_buildx:
-            build_flags: list[str] = [
-                "--platform",
-                "linux/amd64",
-                "--load",
-            ]
-            if not verbose:
-                build_flags.append("--progress=quiet")
-            with Progress(message="Building...", elapsed=not verbose):
-                build_docker_image(
-                    runner,
-                    lambda _msg: None,
-                    config,
-                    config_json,
-                    base_image,
-                    api_version,
-                    pull,
-                    local_tag,
-                    docker_build_args,
-                    install_command,
-                    build_command,
-                    docker_command=("docker", "buildx", "build"),
-                    extra_flags=build_flags,
-                    verbose=verbose,
-                )
+        if prebuilt_image:
+            _log_deploy_step(step, f"Validating image {prebuilt_image}")
+            _validate_prebuilt_image(runner, prebuilt_image, verbose=verbose)
+            click.secho("   Image is available for linux/amd64", fg="green")
         else:
-            with Progress(message="Building...", elapsed=not verbose):
-                build_docker_image(
-                    runner,
-                    lambda _msg: None,
-                    config,
-                    config_json,
-                    base_image,
-                    api_version,
-                    pull,
-                    local_tag,
-                    docker_build_args,
-                    install_command,
-                    build_command,
-                    verbose=verbose,
-                )
+            # -- Step: Build image --
+            _log_deploy_step(step, "Building image")
+            if needs_buildx:
+                build_flags: list[str] = [
+                    "--platform",
+                    "linux/amd64",
+                    "--load",
+                ]
+                if not verbose:
+                    build_flags.append("--progress=quiet")
+                with Progress(message="Building...", elapsed=not verbose):
+                    build_docker_image(
+                        runner,
+                        lambda _msg: None,
+                        config,
+                        config_json,
+                        base_image,
+                        api_version,
+                        pull,
+                        local_tag,
+                        docker_build_args,
+                        install_command,
+                        build_command,
+                        docker_command=("docker", "buildx", "build"),
+                        extra_flags=build_flags,
+                        verbose=verbose,
+                    )
+            else:
+                with Progress(message="Building...", elapsed=not verbose):
+                    build_docker_image(
+                        runner,
+                        lambda _msg: None,
+                        config,
+                        config_json,
+                        base_image,
+                        api_version,
+                        pull,
+                        local_tag,
+                        docker_build_args,
+                        install_command,
+                        build_command,
+                        verbose=verbose,
+                    )
         step += 1
 
         # -- Step: Get push token and authenticate --
@@ -1023,7 +1072,7 @@ def _run_local_build(
                 subp_exec(
                     "docker",
                     "tag",
-                    local_tag,
+                    image_to_push,
                     remote_image,
                     verbose=verbose,
                 )
@@ -1423,6 +1472,13 @@ def _deploy_base_options(
                 show_default=True,
                 help="Tag to use for the pushed deployment image.",
             ),
+            click.option(
+                "--image",
+                help=(
+                    "Use an existing local image reference (e.g. repo:tag) and "
+                    "skip building. The image must target linux/amd64."
+                ),
+            ),
             click.option(
                 "--config",
                 "-c",
@@ -1523,6 +1579,7 @@ def _deploy_cmd(
     deployment_type: str,
     name: str | None,
     image_name: str | None,
+    image: str | None,
     tag: str,
     base_image: str | None,
     install_command: str | None,
@@ -1569,7 +1626,12 @@ def _deploy_cmd(
 
     secrets = _secrets_from_env(_env_without_deployment_name(env_vars))
 
-    use_remote_build, local_build_error = _resolve_build_mode(remote_build_flag)
+    if image and remote_build_flag is True:
+        raise click.UsageError("--image cannot be combined with --remote builds.")
+
+    use_remote_build, local_build_error = _resolve_build_mode(
+        remote_build_flag, force_local=image is not None
+    )
     if use_remote_build and remote_build_flag is None and local_build_error:
         em.note(f"{local_build_error}\nUsing remote build instead.")
         if not json_output:
@@ -1639,6 +1701,7 @@ def _deploy_cmd(
             api_version=api_version,
             base_image=base_image,
             image_name=image_name,
+            prebuilt_image=image,
             name=name,
             tag=tag,
             install_command=install_command,
@@ -1723,8 +1786,12 @@ def deploy_list(api_key: str | None, host_url: str | None, name_contains: str) -
         client,
         lambda c: c.list_deployments(name_contains=name_contains),
     )
-    resources = response.get("resources", []) if isinstance(response, dict) else []
-    deployments = [item for item in resources if isinstance(item, dict)]
+    resources = response.get("resources") if isinstance(response, dict) else None
+    deployments = (
+        [item for item in resources if isinstance(item, dict)]
+        if isinstance(resources, list)
+        else []
+    )
     if not deployments:
         click.echo("No deployments found.")
         return
@@ -1768,8 +1835,12 @@ def deploy_revisions_list(
         client,
         lambda c: c.list_revisions(deployment_id, limit=limit),
     )
-    resources = response.get("resources", []) if isinstance(response, dict) else []
-    revisions = [item for item in resources if isinstance(item, dict)]
+    resources = response.get("resources") if isinstance(response, dict) else None
+    revisions = (
+        [item for item in resources if isinstance(item, dict)]
+        if isinstance(resources, list)
+        else []
+    )
     if not revisions:
         click.echo(f"No revisions found for deployment {deployment_id}.")
         return

libs/cli/pyproject.toml

@@ -23,7 +23,7 @@ dependencies = [
 path = "langgraph_cli/__init__.py"
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.5.35,<0.12.0a0 ; python_version >= '3.11'",
+    "langgraph-api>=0.5.35,<1.0.0 ; python_version >= '3.11'",
     "langgraph-runtime-inmem>=0.7 ; python_version >= '3.11'",
 ]
 
@@ -72,9 +72,15 @@ 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_cli/**" = ["PLC0415"], "generate_schema.py" = ["PLC0415"] }
 target-version = "py310"
 
 [tool.ty.rules]

libs/cli/tests/unit_tests/test_archive.py

@@ -11,6 +11,7 @@ from langgraph_cli.archive import (
     _tar_filter,
     create_archive,
 )
+from langgraph_cli.config import LocalDeps
 
 # ---------------------------------------------------------------------------
 # _tar_filter
@@ -198,7 +199,6 @@ class TestCreateArchive:
 
     @patch("langgraph_cli.archive._assemble_local_deps")
     def test_yields_archive_with_config(self, mock_deps, tmp_path):
-        from langgraph_cli.config import LocalDeps
 
         config_file = self._make_project(tmp_path)
         mock_deps.return_value = LocalDeps(
@@ -218,7 +218,6 @@ class TestCreateArchive:
 
     @patch("langgraph_cli.archive._assemble_local_deps")
     def test_excludes_pycache(self, mock_deps, tmp_path):
-        from langgraph_cli.config import LocalDeps
 
         config_file = self._make_project(tmp_path)
         mock_deps.return_value = LocalDeps(
@@ -232,7 +231,6 @@ class TestCreateArchive:
 
     @patch("langgraph_cli.archive._assemble_local_deps")
     def test_cleans_up_tmp_dir_on_normal_exit(self, mock_deps, tmp_path):
-        from langgraph_cli.config import LocalDeps
 
         config_file = self._make_project(tmp_path)
         mock_deps.return_value = LocalDeps(
@@ -247,7 +245,6 @@ class TestCreateArchive:
 
     @patch("langgraph_cli.archive._assemble_local_deps")
     def test_cleans_up_tmp_dir_on_exception(self, mock_deps, tmp_path):
-        from langgraph_cli.config import LocalDeps
 
         config_file = self._make_project(tmp_path)
         mock_deps.return_value = LocalDeps(
@@ -264,7 +261,6 @@ class TestCreateArchive:
     @patch("langgraph_cli.archive._assemble_local_deps")
     @patch("langgraph_cli.archive._MAX_SIZE", 10)
     def test_raises_on_oversized_archive(self, mock_deps, tmp_path):
-        from langgraph_cli.config import LocalDeps
 
         config_file = self._make_project(tmp_path)
         mock_deps.return_value = LocalDeps(
@@ -278,7 +274,6 @@ class TestCreateArchive:
     @patch("langgraph_cli.archive._assemble_local_deps")
     def test_handles_extra_contexts(self, mock_deps, tmp_path):
         """Monorepo case: project + sibling dependency directory."""
-        from langgraph_cli.config import LocalDeps
 
         project = tmp_path / "myproject"
         project.mkdir()

libs/cli/tests/unit_tests/test_config.py

@@ -2961,6 +2961,163 @@ def test_docker_tag_with_prerelease_api_version(version: str, in_config: bool):
     assert tag == f"langchain/langgraph-api:{version}-py3.11"
 
 
+def test_docker_tag_with_compatible_api_version_promotes_to_latest_patch():
+    config = validate_config(
+        {
+            "python_version": "3.12",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "image_distro": "wolfi",
+            "api_version": "~=0.11.0.dev5",
+        }
+    )
+
+    with patch(
+        "langgraph_cli.config._get_pypi_versions",
+        return_value=[
+            "0.11.0.dev5",
+            "0.11.0.dev6",
+            "0.11.0rc1",
+            "0.11.0",
+            "0.11.1rc1",
+            "0.11.1",
+            "0.12.0rc1",
+        ],
+    ) as get_versions:
+        tag = docker_tag(config)
+
+    get_versions.assert_called_once_with("langgraph-api")
+    assert tag == "langchain/langgraph-api:0.11.1-py3.12-wolfi"
+
+
+def test_docker_tag_with_compatible_api_version_freezes_dev_until_rc():
+    config = validate_config(
+        {
+            "python_version": "3.12",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "api_version": "~=0.11.0.dev5",
+        }
+    )
+
+    with patch(
+        "langgraph_cli.config._get_pypi_versions",
+        return_value=[
+            "0.11.0.dev5",
+            "0.11.0.dev6",
+            "0.11.0.dev7",
+        ],
+    ):
+        tag = docker_tag(config)
+
+    assert tag == "langchain/langgraph-api:0.11.0.dev5-py3.12"
+
+
+def test_docker_tag_with_stable_floating_api_version_promotes_to_future_stable():
+    config = validate_config(
+        {
+            "python_version": "3.12",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "image_distro": "wolfi",
+            "api_version": ">~=0.11.0.dev5",
+        }
+    )
+
+    with patch(
+        "langgraph_cli.config._get_pypi_versions",
+        return_value=[
+            "0.11.0.dev5",
+            "0.11.0.dev6",
+            "0.11.0rc1",
+            "0.11.0",
+            "0.11.1",
+            "0.12.0rc1",
+            "0.12.0",
+            "0.13.0.dev1",
+            "0.13.0",
+        ],
+    ) as get_versions:
+        tag = docker_tag(config)
+
+    get_versions.assert_called_once_with("langgraph-api")
+    assert tag == "langchain/langgraph-api:0.13.0-py3.12-wolfi"
+
+
+def test_docker_tag_with_stable_floating_api_version_ignores_future_prereleases():
+    config = validate_config(
+        {
+            "python_version": "3.12",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "api_version": ">~=0.11.0.dev5",
+        }
+    )
+
+    with patch(
+        "langgraph_cli.config._get_pypi_versions",
+        return_value=[
+            "0.11.0.dev5",
+            "0.11.0",
+            "0.12.0rc1",
+            "0.12.0.dev1",
+        ],
+    ):
+        tag = docker_tag(config)
+
+    assert tag == "langchain/langgraph-api:0.11.0-py3.12"
+
+
+def test_validate_config_rejects_unrecognized_api_version_range_operator():
+    with pytest.raises(click.UsageError, match="Invalid version format"):
+        validate_config(
+            {
+                "python_version": "3.12",
+                "dependencies": ["."],
+                "graphs": {"agent": "./agent.py:graph"},
+                "api_version": "~>=0.11.0.dev5",
+            }
+        )
+
+
+def test_docker_tag_with_compatible_api_version_supports_node_images():
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+            "image_distro": "wolfi",
+            "api_version": "~=1.2.4",
+        }
+    )
+
+    with patch(
+        "langgraph_cli.config._get_pypi_versions",
+        return_value=[
+            "1.2.4",
+            "1.2.5",
+            "1.3.0",
+        ],
+    ) as get_versions:
+        tag = docker_tag(config)
+
+    get_versions.assert_called_once_with("langgraph-api")
+    assert tag == "langchain/langgraphjs-api:1.2.5-node20-wolfi"
+
+
+def test_docker_tag_with_compatible_api_version_rejects_tagged_base_image():
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "api_version": "~=0.11.0.dev5",
+        }
+    )
+
+    with pytest.raises(click.UsageError, match="tagged base_image"):
+        docker_tag(config, base_image="langchain/langgraph-api:0.11.0")
+
+
 def test_config_to_docker_with_api_version():
     """Test config_to_docker function with api_version parameter."""
 

libs/cli/tests/unit_tests/test_deploy_helpers.py

@@ -1,3 +1,4 @@
+import asyncio
 import base64
 import io
 import json
@@ -6,9 +7,11 @@ import sys
 from unittest.mock import MagicMock
 
 import click
+import click.exceptions
 import httpx
 import pytest
 
+import langgraph_cli.deploy as deploy_mod
 from langgraph_cli.deploy import (
     _call_host_backend_with_optional_tenant,
     _create_host_backend_client,
@@ -19,6 +22,7 @@ from langgraph_cli.deploy import (
     _resolve_env_path,
     _resolve_pushed_image_digest,
     _smith_dashboard_base_url,
+    _validate_prebuilt_image,
     normalize_image_tag,
     normalize_name,
 )
@@ -95,6 +99,65 @@ class TestNormalizeImageTag:
             normalize_image_tag("has space")
 
 
+class _FakeRunner:
+    def run(self, coro):
+        return asyncio.run(coro)
+
+
+class TestValidatePrebuiltImage:
+    def test_accepts_linux_amd64(self, monkeypatch):
+        calls = []
+
+        async def fake_subp_exec(*args, **kwargs):
+            calls.append((args, kwargs))
+            return "linux/amd64\n", None
+
+        monkeypatch.setattr(deploy_mod, "subp_exec", fake_subp_exec)
+
+        _validate_prebuilt_image(_FakeRunner(), "repo/app:tag", verbose=False)
+
+        assert calls == [
+            (
+                (
+                    "docker",
+                    "image",
+                    "inspect",
+                    "--format",
+                    "{{.Os}}/{{.Architecture}}",
+                    "repo/app:tag",
+                ),
+                {"verbose": False, "collect": True},
+            )
+        ]
+
+    def test_missing_docker_binary_raises_actionable_error(self, monkeypatch):
+        async def fake_subp_exec(*args, **kwargs):
+            raise FileNotFoundError("docker")
+
+        monkeypatch.setattr(deploy_mod, "subp_exec", fake_subp_exec)
+
+        with pytest.raises(click.ClickException, match="Docker is required"):
+            _validate_prebuilt_image(_FakeRunner(), "repo/app:tag", verbose=False)
+
+    def test_missing_image_raises_actionable_error(self, monkeypatch):
+        async def fake_subp_exec(*args, **kwargs):
+            raise click.exceptions.Exit(1)
+
+        monkeypatch.setattr(deploy_mod, "subp_exec", fake_subp_exec)
+
+        with pytest.raises(click.ClickException, match="not found locally"):
+            _validate_prebuilt_image(_FakeRunner(), "missing:tag", verbose=False)
+
+    def test_rejects_non_amd64_platform(self, monkeypatch):
+        async def fake_subp_exec(*args, **kwargs):
+            return "linux/arm64\n", None
+
+        monkeypatch.setattr(deploy_mod, "subp_exec", fake_subp_exec)
+
+        with pytest.raises(click.ClickException, match="requires linux/amd64"):
+            _validate_prebuilt_image(_FakeRunner(), "repo/app:arm", verbose=False)
+
+
 class TestParseEnvFromConfig:
     def test_env_dict(self, tmp_path):
         config_path = tmp_path / "langgraph.json"
@@ -284,7 +347,6 @@ class TestCallHostBackendWithOptionalTenant:
 
     def test_workspace_prompt_blocked_by_no_input(self, monkeypatch):
         """With _no_input=True, 403 requiring workspace should raise ClickException."""
-        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
 
@@ -452,7 +514,6 @@ class TestEmitterTextMode:
 
 class TestCreateHostBackendClientNoInput:
     def test_raises_when_no_api_key_and_no_input(self, monkeypatch, tmp_path):
-        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
         monkeypatch.delenv("LANGSMITH_API_KEY", raising=False)
@@ -467,7 +528,6 @@ class TestCreateHostBackendClientNoInput:
             )
 
     def test_succeeds_with_api_key_in_env(self, monkeypatch, tmp_path):
-        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
         monkeypatch.setenv("LANGSMITH_API_KEY", "lsv2_test")

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

@@ -237,14 +237,14 @@ wheels = [
 
 [[package]]
 name = "langchain-protocol"
-version = "0.0.15"
+version = "0.0.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/4f/24/9777489d6fbbee64af0c8f96d4f840239c408cf694f3394672807dafc490/langchain_protocol-0.0.15.tar.gz", hash = "sha256:9ab2d11ee73944754f10e037e717098d3a6796f0e58afa9cadda6154e7655ade", size = 5862, upload-time = "2026-05-01T22:30:04.748Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/44/b3/4e2429876c7a35585618caa2b9f9089f7162a6b50562b614ad82ac11c17e/langchain_protocol-0.0.17.tar.gz", hash = "sha256:e7cbe58c205df4b4fd87dc6d5bb23f10e13b236d0e2e1b0b9d05bc2b648f3eea", size = 6026, upload-time = "2026-06-12T18:39:51.923Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/7a/9c97a7b9cbe4c5dc6a44cdb1545450c28f0c8ce89b9c1f0ee7fbad896263/langchain_protocol-0.0.15-py3-none-any.whl", hash = "sha256:461eb794358f83d5e42635a5797799ffec7b4702314e34edf73ac21e75d3ef79", size = 6982, upload-time = "2026-05-01T22:30:03.877Z" },
+    { url = "https://files.pythonhosted.org/packages/13/0a/a1bfe72c6ec856e99773bbd96c8086421e554b3693d0142b9ea009c6ac92/langchain_protocol-0.0.17-py3-none-any.whl", hash = "sha256:982a08fe152586ed10d4ff3d538c2e0b5766e5f307cdea325e10be3f2c17cae6", size = 7096, upload-time = "2026-06-12T18:39:50.973Z" },
 ]
 
 [[package]]

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

@@ -211,14 +211,14 @@ wheels = [
 
 [[package]]
 name = "langchain-protocol"
-version = "0.0.15"
+version = "0.0.17"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/4f/24/9777489d6fbbee64af0c8f96d4f840239c408cf694f3394672807dafc490/langchain_protocol-0.0.15.tar.gz", hash = "sha256:9ab2d11ee73944754f10e037e717098d3a6796f0e58afa9cadda6154e7655ade", size = 5862, upload-time = "2026-05-01T22:30:04.748Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/44/b3/4e2429876c7a35585618caa2b9f9089f7162a6b50562b614ad82ac11c17e/langchain_protocol-0.0.17.tar.gz", hash = "sha256:e7cbe58c205df4b4fd87dc6d5bb23f10e13b236d0e2e1b0b9d05bc2b648f3eea", size = 6026, upload-time = "2026-06-12T18:39:51.923Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/7a/9c97a7b9cbe4c5dc6a44cdb1545450c28f0c8ce89b9c1f0ee7fbad896263/langchain_protocol-0.0.15-py3-none-any.whl", hash = "sha256:461eb794358f83d5e42635a5797799ffec7b4702314e34edf73ac21e75d3ef79", size = 6982, upload-time = "2026-05-01T22:30:03.877Z" },
+    { url = "https://files.pythonhosted.org/packages/13/0a/a1bfe72c6ec856e99773bbd96c8086421e554b3693d0142b9ea009c6ac92/langchain_protocol-0.0.17-py3-none-any.whl", hash = "sha256:982a08fe152586ed10d4ff3d538c2e0b5766e5f307cdea325e10be3f2c17cae6", size = 7096, upload-time = "2026-06-12T18:39:50.973Z" },
 ]
 
 [[package]]

libs/langgraph/README.md

@@ -1,100 +1,45 @@
-<div align="center">
-  <a href="https://www.langchain.com/langgraph">
-    <picture>
-      <source media="(prefers-color-scheme: dark)" srcset="../../.github/images/logo-dark.svg">
-      <source media="(prefers-color-scheme: light)" srcset="../../.github/images/logo-light.svg">
-      <img alt="LangGraph Logo" src=".github/images/logo-dark.svg" width="50%">
-    </picture>
-  </a>
-</div>
+# 🦜🕸️ LangGraph
 
-<div align="center">
-  <h3>Low-level orchestration framework for building stateful agents.</h3>
-</div>
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph?label=%20)](https://pypi.org/project/langgraph/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph)](https://pypistats.org/packages/langgraph)
+[![Open Issues](https://img.shields.io/github/issues-raw/langchain-ai/langgraph)](https://github.com/langchain-ai/langgraph/issues)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
 
-<div align="center">
-  <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://github.com/langchain-ai/langgraph/issues" target="_blank"><img src="https://img.shields.io/github/issues-raw/langchain-ai/langgraph" alt="Open Issues"></a>
-  <a href="https://docs.langchain.com/oss/python/langgraph/overview" target="_blank"><img src="https://img.shields.io/badge/docs-latest-blue" alt="Docs"></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>
-</div>
+Looking for the JS/TS version? Check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs).
 
-<br>
+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.
 
-Trusted by companies shaping the future of agents – including Klarna, Replit, Elastic, and more – LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful agents.
+## Quick Install
 
-## Get started
-
-Install LangGraph:
-
-```
-pip install -U langgraph
+```bash
+uv add langgraph
 ```
 
-Create a simple workflow:
+## 🤔 What is this?
 
-```python
-from langgraph.graph import START, StateGraph
-from typing_extensions import TypedDict
+LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful agents. LangGraph provides the infrastructure for durable execution, streaming, human-in-the-loop, persistence, memory, and more.
 
+We recommend you use LangGraph when you have advanced needs that require a combination of deterministic and agentic workflows, heavy customization, and carefully controlled latency. Use [LangChain](https://docs.langchain.com/oss/python/langchain/overview) when you want to quickly build agents and applications powered by LLMs using pre-built agent architectures and model integrations.
 
-class State(TypedDict):
-    text: str
+LangChain [agents](https://docs.langchain.com/oss/python/langchain/agents) are built on top of LangGraph in order to provide durable execution, streaming, human-in-the-loop, persistence, and more. (You do not need to know LangGraph for basic LangChain agent usage.)
 
+Trusted by companies shaping the future of agents – including Klarna, Replit, Elastic, and more – LangGraph is used to ship AI applications at scale.
 
-def node_a(state: State) -> dict:
-    return {"text": state["text"] + "a"}
+## 📖 Documentation
 
+For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph/). For conceptual guides, tutorials, and examples on using LangGraph, 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).
 
-def node_b(state: State) -> dict:
-    return {"text": state["text"] + "b"}
+## 📕 Releases & Versioning
 
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
 
-graph = StateGraph(State)
-graph.add_node("node_a", node_a)
-graph.add_node("node_b", node_b)
-graph.add_edge(START, "node_a")
-graph.add_edge("node_a", "node_b")
+## 💁 Contributing
 
-print(graph.compile().invoke({"text": ""}))
-# {'text': 'ab'}
-```
+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.
 
-Get started with the [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart).
-
-To quickly build agents with LangChain's `create_agent` (built on LangGraph), see the [LangChain Agents documentation](https://docs.langchain.com/oss/python/langchain/agents).
-
-## Core benefits
-
-LangGraph provides low-level supporting infrastructure for *any* long-running, stateful workflow or agent. LangGraph does not abstract prompts or architecture, and provides the following central benefits:
-
-- [Durable execution](https://docs.langchain.com/oss/python/langgraph/durable-execution): Build agents that persist through failures and can run for extended periods, automatically resuming from exactly where they left off.
-- [Human-in-the-loop](https://docs.langchain.com/oss/python/langgraph/interrupts): Seamlessly incorporate human oversight by inspecting and modifying agent state at any point during execution.
-- [Comprehensive memory](https://docs.langchain.com/oss/python/langgraph/memory): Create truly stateful agents with both short-term working memory for ongoing reasoning and long-term persistent memory across sessions.
-- [Debugging with LangSmith](http://www.langchain.com/langsmith): Gain deep visibility into complex agent behavior with visualization tools that trace execution paths, capture state transitions, and provide detailed runtime metrics.
-- [Production-ready deployment](https://docs.langchain.com/langsmith/app-development): Deploy sophisticated agent systems confidently with scalable infrastructure designed to handle the unique challenges of stateful, long-running workflows.
-
-## LangGraph’s ecosystem
-
-While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents. To improve your LLM application development, pair LangGraph with:
-
-- [LangSmith](http://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 [LangGraph Studio](https://docs.langchain.com/oss/python/langgraph/studio).
-- [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
-
-> [!NOTE]
-> Looking for the JS version of LangGraph? See the [JS repo](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
-
-## Additional resources
-
-- [Guides](https://docs.langchain.com/oss/python/langgraph/guides): Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
-- [Reference](https://reference.langchain.com/python/langgraph/): Detailed reference on core classes, methods, how to use the graph and checkpointing APIs, and higher-level prebuilt components.
-- [Examples](https://docs.langchain.com/oss/python/langgraph/agentic-rag): Guided examples on getting started with LangGraph.
-- [LangChain Forum](https://forum.langchain.com/): Connect with the community and share all of your technical questions, ideas, and feedback.
-- [LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph): Learn the basics of LangGraph in our free, structured course.
-- [Case studies](https://www.langchain.com/built-with-langgraph): Hear how industry leaders use LangGraph to ship AI applications at scale.
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).
 
 ## Acknowledgements
 

libs/langgraph/langgraph/_internal/_config.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from collections import ChainMap
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from os import getenv
 from typing import Any, cast
 
@@ -20,6 +20,7 @@ from langchain_core.runnables.config import (
 from langgraph.checkpoint.base import CheckpointMetadata
 
 from langgraph._internal._constants import (
+    _CHECKPOINT_COORDINATE_KEYS,
     CONF,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_MAP,
@@ -79,6 +80,42 @@ def patch_checkpoint_map(
         return config
 
 
+def _copy_mapping_value(value: Any) -> Any:
+    return dict(value) if isinstance(value, Mapping) else value
+
+
+def _merge_metadata(
+    base: Mapping[str, Any] | None, new: Mapping[str, Any] | None
+) -> dict[str, Any]:
+    """Merge metadata without mutating inputs.
+
+    Top-level keys merge with newer values winning. `lc_versions` is the only
+    mapping-valued key that merges one level deeper, so independent LangChain
+    packages can contribute package versions without changing generic metadata
+    semantics. Mapping values are copied one level, so deeper nested objects
+    remain shared. `None` inputs are treated as empty metadata.
+
+    Mirrors `langchain_core.runnables.config._merge_metadata_dicts` so configs
+    that pass through LangGraph's merge keep the same `lc_versions` semantics;
+    keep the two in sync. Unlike lc-core, this copies mapping values one level
+    (intentionally more defensive — do not "simplify" back to a shared ref).
+    """
+    merged = {key: _copy_mapping_value(value) for key, value in (base or {}).items()}
+    for key, value in (new or {}).items():
+        if (
+            key == "lc_versions"
+            and isinstance(merged.get(key), Mapping)
+            and isinstance(value, Mapping)
+        ):
+            merged[key] = {
+                **cast(Mapping[str, Any], merged[key]),
+                **value,
+            }
+        else:
+            merged[key] = _copy_mapping_value(value)
+    return merged
+
+
 def _merge_callbacks(base: Callbacks, new: Callbacks) -> Callbacks:
     """Merge two callbacks values (None / list / BaseCallbackManager).
 
@@ -126,10 +163,10 @@ def merge_configs(*configs: RunnableConfig | None) -> RunnableConfig:
             if not value:
                 continue
             if key == "metadata":
-                if base_value := base.get(key):
-                    base[key] = {**base_value, **value}  # type: ignore
-                else:
-                    base[key] = value  # type: ignore[literal-required]
+                base[key] = _merge_metadata(
+                    cast(Mapping[str, Any] | None, base.get(key)),
+                    cast(Mapping[str, Any], value),
+                )
             elif key == "tags":
                 if base_value := base.get(key):
                     base[key] = [*base_value, *value]  # type: ignore
@@ -306,6 +343,28 @@ def ensure_config(*configs: RunnableConfig | None) -> RunnableConfig:
                 if _is_not_empty(v)
             },
         )
+    # An explicit config that supplies its own checkpoint coordinate (a
+    # thread_id, or any checkpoint_ns/checkpoint_id/checkpoint_map) is addressing
+    # its own checkpoint lineage, so drop the inherited ambient configurable
+    # rather than merging over it: a child graph invoked inside a parent node
+    # would otherwise write its checkpoints under the parent's namespace and
+    # never find them again. An explicit thread_id resets even when it equals the
+    # ambient one, since a child reusing the parent's thread id still addresses
+    # its own root namespace, not the parent task's. Configs that only refine
+    # other keys keep the ambient and shallow-merge over it below.
+    if empty.get(CONF):
+        for config in configs:
+            if config is None:
+                continue
+            explicit_configurable = config.get(CONF)
+            if not explicit_configurable:
+                continue
+            if any(
+                _is_not_empty(explicit_configurable.get(k))
+                for k in _CHECKPOINT_COORDINATE_KEYS
+            ):
+                empty[CONF] = {}
+                break
     for config in configs:
         if config is None:
             continue
@@ -327,14 +386,11 @@ def ensure_config(*configs: RunnableConfig | None) -> RunnableConfig:
                         empty.get("callbacks"), cast(Callbacks, v)
                     )
                 elif k == "metadata":
-                    # Shallow-merge metadata dicts across configs so values
-                    # bound via with_config(...) (e.g. user_id) are preserved
-                    # when later configs supply other metadata keys.
-                    existing = empty.get("metadata")
-                    empty["metadata"] = (
-                        {**cast(dict, existing), **cast(dict, v)}
-                        if existing
-                        else cast(dict, v).copy()
+                    # Matches merge_configs: top-level metadata keys merge, and
+                    # only `lc_versions` merges one level deeper.
+                    empty["metadata"] = _merge_metadata(
+                        cast(Mapping[str, Any] | None, empty.get("metadata")),
+                        cast(Mapping[str, Any], v),
                     )
                 elif k == "tags":
                     # Concatenate tags across configs so values bound via

libs/langgraph/langgraph/_internal/_constants.py

@@ -95,6 +95,15 @@ NULL_TASK_ID = sys.intern("00000000-0000-0000-0000-000000000000")
 OVERWRITE = sys.intern("__overwrite__")
 # dict key for the overwrite value, used as `{'__overwrite__': value}`
 
+# Checkpoint coordinate keys: when any of these appear in an explicit
+# configurable, the caller is addressing its own checkpoint lineage.
+_CHECKPOINT_COORDINATE_KEYS = (
+    CONFIG_KEY_THREAD_ID,
+    CONFIG_KEY_CHECKPOINT_NS,
+    CONFIG_KEY_CHECKPOINT_ID,
+    CONFIG_KEY_CHECKPOINT_MAP,
+)
+
 # redefined to avoid circular import with langgraph.constants
 _TAG_HIDDEN = sys.intern("langsmith:hidden")
 

libs/langgraph/langgraph/_internal/_pydantic.py

@@ -68,7 +68,7 @@ def _create_root_model(
 
     def schema(
         cls: type[BaseModel],
-        by_alias: bool = True,  # noqa: FBT001,FBT002
+        by_alias: bool = True,
         ref_template: str = DEFAULT_REF_TEMPLATE,
     ) -> dict[str, Any]:
         # Complains about schema not being defined in superclass
@@ -80,7 +80,7 @@ def _create_root_model(
 
     def model_json_schema(
         cls: type[BaseModel],
-        by_alias: bool = True,  # noqa: FBT001,FBT002
+        by_alias: bool = True,
         ref_template: str = DEFAULT_REF_TEMPLATE,
         schema_generator: type[GenerateJsonSchema] = GenerateJsonSchema,
         mode: JsonSchemaMode = "validation",

libs/langgraph/langgraph/_internal/_runnable.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import asyncio
 import enum
 import inspect
+import logging
 import sys
 import warnings
 from collections.abc import (
@@ -63,6 +64,26 @@ try:
 except ImportError:
     _StreamingCallbackHandler = None  # type: ignore
 
+logger = logging.getLogger(__name__)
+
+
+def _trace_payload(value: Any, transform: Callable[[Any], Any] | None) -> Any:
+    """Return the payload to record on a run for `value`.
+
+    When `transform` is unset this is a passthrough, so unspecified nodes record exactly
+    as before. When set it always runs (regardless of tracing), but never affects
+    execution: if it raises, the untransformed value is recorded instead.
+    """
+    if transform is None:
+        return value
+    try:
+        return transform(value)
+    except Exception:
+        logger.exception(
+            "trace input/output processor raised; recording untransformed payload"
+        )
+        return value
+
 
 def _set_config_context(
     config: RunnableConfig, run: Any = None
@@ -572,6 +593,7 @@ class RunnableSeq(Runnable):
         *steps: RunnableLike,
         name: str | None = None,
         trace_inputs: Callable[[Any], Any] | None = None,
+        trace_outputs: Callable[[Any], Any] | None = None,
     ) -> None:
         """Create a new RunnableSeq.
 
@@ -597,6 +619,7 @@ class RunnableSeq(Runnable):
         self.steps = steps_flat
         self.name = name
         self.trace_inputs = trace_inputs
+        self.trace_outputs = trace_outputs
 
     def __or__(
         self,
@@ -658,7 +681,7 @@ class RunnableSeq(Runnable):
         # start the root run
         run_manager = callback_manager.on_chain_start(
             None,
-            self.trace_inputs(input) if self.trace_inputs is not None else input,
+            _trace_payload(input, self.trace_inputs),
             name=config.get("run_name") or self.get_name(),
             run_id=config.pop("run_id", None),
         )
@@ -689,7 +712,7 @@ class RunnableSeq(Runnable):
             run_manager.on_chain_error(e)
             raise
         else:
-            run_manager.on_chain_end(input)
+            run_manager.on_chain_end(_trace_payload(input, self.trace_outputs))
             return input
 
     async def ainvoke(
@@ -705,7 +728,7 @@ class RunnableSeq(Runnable):
         # start the root run
         run_manager = await callback_manager.on_chain_start(
             None,
-            self.trace_inputs(input) if self.trace_inputs is not None else input,
+            _trace_payload(input, self.trace_inputs),
             name=config.get("run_name") or self.get_name(),
             run_id=config.pop("run_id", None),
         )
@@ -742,7 +765,7 @@ class RunnableSeq(Runnable):
             await run_manager.on_chain_error(e)
             raise
         else:
-            await run_manager.on_chain_end(input)
+            await run_manager.on_chain_end(_trace_payload(input, self.trace_outputs))
             return input
 
     def stream(
@@ -758,7 +781,7 @@ class RunnableSeq(Runnable):
         # start the root run
         run_manager = callback_manager.on_chain_start(
             None,
-            self.trace_inputs(input) if self.trace_inputs is not None else input,
+            _trace_payload(input, self.trace_inputs),
             name=config.get("run_name") or self.get_name(),
             run_id=config.pop("run_id", None),
         )
@@ -803,7 +826,7 @@ class RunnableSeq(Runnable):
                 run_manager.on_chain_error(e)
                 raise
             else:
-                run_manager.on_chain_end(output)
+                run_manager.on_chain_end(_trace_payload(output, self.trace_outputs))
 
     async def astream(
         self,
@@ -818,7 +841,7 @@ class RunnableSeq(Runnable):
         # start the root run
         run_manager = await callback_manager.on_chain_start(
             None,
-            self.trace_inputs(input) if self.trace_inputs is not None else input,
+            _trace_payload(input, self.trace_inputs),
             name=config.get("run_name") or self.get_name(),
             run_id=config.pop("run_id", None),
         )
@@ -873,7 +896,9 @@ class RunnableSeq(Runnable):
                     await run_manager.on_chain_error(e)
                     raise
                 else:
-                    await run_manager.on_chain_end(output)
+                    await run_manager.on_chain_end(
+                        _trace_payload(output, self.trace_outputs)
+                    )
         else:
             try:
                 async with AsyncExitStack() as stack:
@@ -903,7 +928,9 @@ class RunnableSeq(Runnable):
                 await run_manager.on_chain_error(e)
                 raise
             else:
-                await run_manager.on_chain_end(output)
+                await run_manager.on_chain_end(
+                    _trace_payload(output, self.trace_outputs)
+                )
 
 
 def _consume_iter(it: Iterator[Any]) -> Any:

libs/langgraph/langgraph/_internal/_serde.py

@@ -22,7 +22,7 @@ from pydantic import BaseModel
 from typing_extensions import NotRequired, Required, is_typeddict
 
 try:
-    from langgraph.checkpoint.serde._msgpack import (  # noqa: F401
+    from langgraph.checkpoint.serde._msgpack import (
         STRICT_MSGPACK_ENABLED,
     )
 except ImportError:

libs/langgraph/langgraph/channels/binop.py

@@ -29,11 +29,25 @@ def _strip_extras(t):  # type: ignore[no-untyped-def]
 
 
 def _get_overwrite(value: Any) -> tuple[bool, Any]:
-    """Inspects the given value and returns (is_overwrite, overwrite_value)."""
+    """Inspects the given value and returns (is_overwrite, overwrite_value).
+
+    Recognises three forms:
+
+    * The typed `Overwrite` dataclass instance.
+    * The sentinel-keyed `{"__overwrite__": value}` dict form.
+    * The dataclass-erased `{"value": ..., "type": "__overwrite__"}` form that
+      results from JSON-serialising an `Overwrite` (e.g. an `orjson`-encoded
+      state update routed through the LangGraph API server). This keeps the
+      `Overwrite` semantics intact across JSON boundaries that strip dataclass
+      types.
+    """
     if isinstance(value, Overwrite):
         return True, value.value
-    if isinstance(value, dict) and len(value) == 1 and OVERWRITE in value:
-        return True, value[OVERWRITE]
+    if isinstance(value, dict):
+        if len(value) == 1 and OVERWRITE in value:
+            return True, value[OVERWRITE]
+        if value.get("type") == OVERWRITE and "value" in value:
+            return True, value["value"]
     return False, None
 
 

libs/langgraph/langgraph/channels/delta.py

@@ -172,13 +172,11 @@ class DeltaChannel(Generic[Value], BaseChannel[Any, Any, Any]):
                 overwrite_idx = i
         if overwrite_idx is not None:
             _, overwrite_value = _get_overwrite(values[overwrite_idx])
-            base = (
+            self.value = (
                 _copy.copy(overwrite_value)
                 if overwrite_value is not None
                 else self.typ()
             )
-            remaining = [v for i, v in enumerate(values) if i != overwrite_idx]
-            self.value = self.reducer(base, remaining) if remaining else base
             return True
         base = self.typ() if self.value is MISSING else self.value
         self.value = self.reducer(base, list(values))

libs/langgraph/langgraph/errors.py

@@ -7,7 +7,7 @@ from typing import Any, Literal
 from warnings import warn
 
 # EmptyChannelError is re-exported from langgraph.channels.base
-from langgraph.checkpoint.base import EmptyChannelError  # noqa: F401
+from langgraph.checkpoint.base import EmptyChannelError
 from typing_extensions import deprecated
 
 from langgraph.types import Command, Interrupt

libs/langgraph/langgraph/graph/_node.py

@@ -9,7 +9,13 @@ from langgraph.store.base import BaseStore
 
 from langgraph._internal._typing import EMPTY_SEQ
 from langgraph.runtime import Runtime
-from langgraph.types import CachePolicy, RetryPolicy, StreamWriter, TimeoutPolicy
+from langgraph.types import (
+    CachePolicy,
+    RetryPolicy,
+    StreamWriter,
+    TimeoutPolicy,
+    TracePolicy,
+)
 from langgraph.typing import ContextT, NodeInputT, NodeInputT_contra
 
 
@@ -93,3 +99,5 @@ class StateNodeSpec(Generic[NodeInputT, ContextT]):
     ends: tuple[str, ...] | dict[str, str] | None = EMPTY_SEQ
     defer: bool = False
     timeout: TimeoutPolicy | None = None
+    trace_policy: TracePolicy | None = None
+    """Optional policy controlling what this node records on its trace run."""

libs/langgraph/langgraph/graph/state.py

@@ -85,6 +85,7 @@ from langgraph.types import (
     RetryPolicy,
     Send,
     TimeoutPolicy,
+    TracePolicy,
     ensure_valid_checkpointer,
 )
 from langgraph.typing import ContextT, InputT, NodeInputT, OutputT, StateT
@@ -384,6 +385,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
         timeout: float | timedelta | TimeoutPolicy | None = None,
+        trace_policy: TracePolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is inferred as the state schema.
@@ -453,6 +455,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
         timeout: float | timedelta | TimeoutPolicy | None = None,
+        trace_policy: TracePolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph` where input schema is specified.
@@ -527,6 +530,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
         timeout: float | timedelta | TimeoutPolicy | None = None,
+        trace_policy: TracePolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is inferred as the state schema.
@@ -596,6 +600,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
         timeout: float | timedelta | TimeoutPolicy | None = None,
+        trace_policy: TracePolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is specified.
@@ -672,6 +677,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
         timeout: float | timedelta | TimeoutPolicy | None = None,
+        trace_policy: TracePolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`.
@@ -691,6 +697,10 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 If a sequence is provided, the first matching policy will be applied.
             cache_policy: The cache policy for the node.
             error_handler: Optional node-level error handler callable for this node.
+            trace_policy: Optional policy controlling how this node's run is traced. Its
+                `process_inputs` callable transforms the node's input before it is
+                recorded (e.g. to omit or summarize large message history) without
+                changing the value passed to the node. Does not affect execution.
             destinations: Destinations that indicate where a node can route to.
 
                 Useful for edgeless graphs with nodes that return `Command` objects.
@@ -880,6 +890,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 ends=ends,
                 defer=defer,
                 timeout=timeout,
+                trace_policy=trace_policy,
             )
         elif inferred_input_schema is not None:
             self.nodes[node] = StateNodeSpec(
@@ -892,6 +903,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 ends=ends,
                 defer=defer,
                 timeout=timeout,
+                trace_policy=trace_policy,
             )
         else:
             self.nodes[node] = StateNodeSpec[StateT, ContextT](
@@ -904,6 +916,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 ends=ends,
                 defer=defer,
                 timeout=timeout,
+                trace_policy=trace_policy,
             )
 
         input_schema = input_schema or inferred_input_schema
@@ -995,7 +1008,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             Without type hints on the `path` function's return value (e.g., `-> Literal["foo", "__end__"]:`)
             or a path_map, the graph visualization assumes the edge could transition to any node in the graph.
 
-        """  # noqa: E501
+        """
         if self.compiled:
             logger.warning(
                 "Adding an edge to a graph that has already been compiled. This will "
@@ -1530,6 +1543,7 @@ class CompiledStateGraph(
                 error_handler_node=node.error_handler_node,
                 bound=node.runnable,  # type: ignore[arg-type]
                 timeout=node.timeout,
+                trace_policy=node.trace_policy,
             )
         else:
             raise RuntimeError

libs/langgraph/langgraph/pregel/_checkpoint.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
-from collections.abc import Callable, Mapping
+import uuid
+from collections.abc import Callable, Iterable, Mapping
 from datetime import datetime, timezone
 from typing import Any, cast
 
@@ -13,6 +14,7 @@ from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.types import _DeltaSnapshot
 
 from langgraph._internal._config import DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT
+from langgraph._internal._constants import PUSH
 from langgraph._internal._typing import MISSING
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.delta import DeltaChannel
@@ -34,6 +36,17 @@ def empty_checkpoint() -> Checkpoint:
     )
 
 
+def exit_delta_task_id(step: int, task_id: str) -> str:
+    """Synthetic task id for exit-mode DeltaChannel writes.
+
+    Embeds the superstep in the first UUID group so `ORDER BY task_id, idx`
+    preserves chronological order while remaining a valid RFC UUID (required by
+    Postgres `checkpoint_writes.task_id uuid` columns).
+    """
+    parts = str(uuid.UUID(task_id)).split("-")
+    return f"{step:08d}-{parts[1]}-{parts[2]}-{parts[3]}-{parts[4]}"
+
+
 def delta_channels_to_snapshot(
     channels: Mapping[str, BaseChannel],
     counters_since_delta_snapshot: Mapping[str, tuple[int, int]],
@@ -58,6 +71,81 @@ def delta_channels_to_snapshot(
     return result
 
 
+def get_updated_channels_from_tasks(
+    run_tasks: Iterable[Any],
+) -> set[str]:
+    """Channel names written by an update_state superstep (excluding PUSH)."""
+    return {c for task in run_tasks for c, _ in task.writes if c != PUSH}
+
+
+def get_delta_channels_from_all_channels(
+    channels: Mapping[str, BaseChannel],
+) -> set[str]:
+    """DeltaChannels to snapshot on the first update_state of a fresh thread."""
+    return {
+        k
+        for k, ch in channels.items()
+        if isinstance(ch, DeltaChannel) and ch.is_available()
+    }
+
+
+def create_metadata_for_update_state_api(
+    channels: Mapping[str, BaseChannel],
+    updated_channels: set[str],
+    *,
+    prev_metadata: Mapping[str, Any] | None,
+) -> dict[str, tuple[int, int]]:
+    """Advance ``counters_since_delta_snapshot`` for update_state on a non-fresh thread.
+
+    Mirrors the per-superstep counter bump in ``_loop._put_checkpoint``.
+    """
+    prev_counters = dict(
+        (prev_metadata or {}).get("counters_since_delta_snapshot") or {}
+    )
+    new_counters: dict[str, tuple[int, int]] = {}
+    for ch_name, ch in channels.items():
+        if not isinstance(ch, DeltaChannel):
+            continue
+        u, s = prev_counters.get(ch_name, (0, 0))
+        s += 1
+        if ch_name in updated_channels:
+            u += 1
+        new_counters[ch_name] = (u, s)
+    return new_counters
+
+
+def create_checkpoint_plan_for_update_state_api(
+    channels: Mapping[str, BaseChannel],
+    updated_channels: set[str],
+    *,
+    step: int,
+    parents: dict[str, Any],
+    saved_metadata: Mapping[str, Any] | None,
+    is_fresh_thread: bool,
+) -> tuple[set[str], dict[str, Any]]:
+    """Return ``(channels_to_snapshot, metadata)`` for an update_state head."""
+    metadata: dict[str, Any] = {
+        "source": "update",
+        "step": step,
+        "parents": parents,
+    }
+    if is_fresh_thread:
+        return get_delta_channels_from_all_channels(channels), metadata
+
+    new_counters = create_metadata_for_update_state_api(
+        channels,
+        updated_channels,
+        prev_metadata=saved_metadata,
+    )
+    channels_to_snapshot = delta_channels_to_snapshot(channels, new_counters)
+    for k in channels_to_snapshot:
+        new_counters[k] = (0, 0)
+    non_zero = {k: v for k, v in new_counters.items() if v != (0, 0)}
+    if non_zero:
+        metadata["counters_since_delta_snapshot"] = non_zero
+    return channels_to_snapshot, metadata
+
+
 def create_checkpoint(
     checkpoint: Checkpoint,
     channels: Mapping[str, BaseChannel] | None,
@@ -90,6 +178,11 @@ def create_checkpoint(
                 continue
             ch = channels[k]
             if k in channels_to_snapshot:
+                # Callers force a full snapshot blob here: exit mode when a
+                # delta channel reaches its snapshot cadence, and update_state
+                # on a fresh thread (no ancestor to replay writes from). The
+                # manual version-bump below only applies to the exit-mode case.
+                #
                 # In exit mode, the snapshot decision is deferred to exit
                 # time (intermediate steps have do_checkpoint=False). The
                 # channel's count may have reached snapshot_frequency over

libs/langgraph/langgraph/pregel/_loop.py

@@ -70,6 +70,7 @@ from langgraph.callbacks import (
     GraphResumeEvent,
 )
 from langgraph.channels.base import BaseChannel
+from langgraph.channels.binop import _get_overwrite
 from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.constants import TAG_HIDDEN
@@ -102,6 +103,7 @@ from langgraph.pregel._checkpoint import (
     create_checkpoint,
     delta_channels_to_snapshot,
     empty_checkpoint,
+    exit_delta_task_id,
 )
 from langgraph.pregel._executor import (
     AsyncBackgroundExecutor,
@@ -220,6 +222,11 @@ class PregelLoop:
     # under the saver's `ORDER BY task_id, idx` sorting.
     _exit_delta_writes: list[tuple[int, str, str, Any]] | None = None
 
+    # Delta channels that saw an Overwrite since the last checkpoint. These
+    # channels must snapshot after live update applies overwrite semantics so
+    # sparse replay starts from the same post-overwrite value.
+    _delta_channels_with_overwrite: set[str]
+
     # The checkpoint_config that points at the parent loaded at `__enter__`
     # (or the synthetic-empty checkpoint, on first run). We capture it
     # eagerly because every `_put_checkpoint` advances `self.checkpoint_config`
@@ -676,6 +683,11 @@ class PregelLoop:
     def after_tick(self) -> None:
         # finish superstep
         writes = [w for t in self.tasks.values() for w in t.writes]
+        self._delta_channels_with_overwrite.update(
+            ch
+            for ch, v in writes
+            if isinstance(self.specs.get(ch), DeltaChannel) and _get_overwrite(v)[0]
+        )
         # all tasks have finished
         self.updated_channels = apply_writes(
             self.checkpoint,
@@ -979,6 +991,11 @@ class PregelLoop:
                 manager=None,
                 updated_channels=updated_channels,
             )
+            self._delta_channels_with_overwrite.update(
+                c
+                for c, v in input_writes
+                if isinstance(self.specs.get(c), DeltaChannel) and _get_overwrite(v)[0]
+            )
             # apply input writes
             updated_channels = apply_writes(
                 self.checkpoint,
@@ -1119,6 +1136,7 @@ class PregelLoop:
         # create new checkpoint
         channels_to_snapshot = (
             delta_channels_to_snapshot(self.channels, new_counters)
+            | self._delta_channels_with_overwrite
             if do_checkpoint
             else set()
         )
@@ -1135,6 +1153,8 @@ class PregelLoop:
         )
         for k in channels_to_snapshot:
             new_counters[k] = (0, 0)
+        if do_checkpoint:
+            self._delta_channels_with_overwrite.difference_update(channels_to_snapshot)
         non_zero = {k: v for k, v in new_counters.items() if v != (0, 0)}
         if non_zero:
             self.checkpoint_metadata["counters_since_delta_snapshot"] = non_zero
@@ -1217,7 +1237,10 @@ class PregelLoop:
         counters = dict(
             self.checkpoint_metadata.get("counters_since_delta_snapshot") or {}
         )
-        channels_to_snapshot = delta_channels_to_snapshot(self.channels, counters)
+        channels_to_snapshot = (
+            delta_channels_to_snapshot(self.channels, counters)
+            | self._delta_channels_with_overwrite
+        )
 
         pending = [
             (step, tid, ch, v)
@@ -1272,7 +1295,7 @@ class PregelLoop:
             },
         )
         for (step, tid), entries in grouped.items():
-            synth_tid = f"{step:08d}-{tid}"
+            synth_tid = exit_delta_task_id(step, tid)
             if self.checkpointer_put_writes_accepts_task_path:
                 fut = self.submit(
                     self.checkpointer_put_writes,
@@ -1661,6 +1684,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
         )
         self._delta_write_futs = []
         self._error_handler_write_futs = []
+        self._delta_channels_with_overwrite = set()
         self._exit_delta_writes = (
             [] if self.durability == "exit" and self.checkpointer is not None else None
         )
@@ -1918,6 +1942,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
         )
         self._delta_write_futs = []
         self._error_handler_write_futs = []
+        self._delta_channels_with_overwrite = set()
         self._exit_delta_writes = (
             [] if self.durability == "exit" and self.checkpointer is not None else None
         )

libs/langgraph/langgraph/pregel/_read.py

@@ -16,7 +16,7 @@ from langgraph._internal._timeout import coerce_timeout_policy
 from langgraph.pregel._utils import find_subgraph_pregel
 from langgraph.pregel._write import ChannelWrite
 from langgraph.pregel.protocol import PregelProtocol
-from langgraph.types import CachePolicy, RetryPolicy, TimeoutPolicy
+from langgraph.types import CachePolicy, RetryPolicy, TimeoutPolicy, TracePolicy
 
 READ_TYPE = Callable[[str | Sequence[str], bool], Any | dict[str, Any]]
 INPUT_CACHE_KEY_TYPE = tuple[Callable[..., Any], tuple[str, ...]]
@@ -138,6 +138,9 @@ class PregelNode:
     metadata: Mapping[str, Any] | None
     """Metadata to attach to the node for tracing."""
 
+    trace_policy: TracePolicy | None
+    """Optional policy controlling what this node records on its trace run."""
+
     is_error_handler: bool
     """Whether this node is registered as an error handler node."""
 
@@ -156,6 +159,7 @@ class PregelNode:
         writers: list[Runnable] | None = None,
         tags: list[str] | None = None,
         metadata: Mapping[str, Any] | None = None,
+        trace_policy: TracePolicy | None = None,
         bound: Runnable[Any, Any] | None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
@@ -177,6 +181,7 @@ class PregelNode:
         self.timeout = coerce_timeout_policy(timeout)
         self.tags = tags
         self.metadata = metadata
+        self.trace_policy = trace_policy
         self.is_error_handler = is_error_handler
         self.error_handler_node = error_handler_node
         if subgraphs is not None:
@@ -222,14 +227,23 @@ class PregelNode:
     def node(self) -> Runnable[Any, Any] | None:
         """Get a runnable that combines `bound` and `writers`."""
         writers = self.flat_writers
+        trace_inputs = self.trace_policy.process_inputs if self.trace_policy else None
+        trace_outputs = self.trace_policy.process_outputs if self.trace_policy else None
         if self.bound is DEFAULT_BOUND and not writers:
             return None
         elif self.bound is DEFAULT_BOUND and len(writers) == 1:
             return writers[0]
         elif self.bound is DEFAULT_BOUND:
-            return RunnableSeq(*writers)
+            return RunnableSeq(
+                *writers, trace_inputs=trace_inputs, trace_outputs=trace_outputs
+            )
         elif writers:
-            return RunnableSeq(self.bound, *writers)
+            return RunnableSeq(
+                self.bound,
+                *writers,
+                trace_inputs=trace_inputs,
+                trace_outputs=trace_outputs,
+            )
         else:
             return self.bound
 

libs/langgraph/langgraph/pregel/_utils.py

@@ -1,11 +1,10 @@
 from __future__ import annotations
 
-import ast
-import inspect
+import dis
 import re
-import textwrap
 from collections.abc import Callable, Sequence
 from functools import partial
+from types import CodeType, FunctionType
 from typing import Any
 
 from langchain_core.runnables import (
@@ -17,7 +16,6 @@ from langchain_core.runnables import (
 from langchain_core.runnables.base import RunnableBindingBase
 from langchain_core.runnables.config import run_in_executor
 from langgraph.checkpoint.base import ChannelVersions
-from typing_extensions import override
 
 from langgraph._internal._runnable import RunnableCallable, RunnableSeq
 from langgraph._internal._timeout import sync_timeout_unsupported
@@ -137,155 +135,87 @@ def validate_timeout_supported(runnable: Runnable, *, name: str) -> None:
         raise sync_timeout_unsupported(name)
 
 
+# Values treated as dead ends when deciding whether to walk a function's
+# bytecode. A container can hold a graph, but `find_subgraph_pregel` does not
+# look inside one, so skipping it costs nothing while that holds. Matched by
+# exact type, since a subclass of a builtin can carry attributes.
+_LEAF_TYPES = frozenset(
+    {
+        int,
+        float,
+        complex,
+        bool,
+        str,
+        bytes,
+        bytearray,
+        list,
+        tuple,
+        dict,
+        set,
+        frozenset,
+        type(None),
+    }
+)
+
+
 def get_function_nonlocals(func: Callable) -> list[Any]:
-    """Get the nonlocal variables accessed by a function.
+    """Get the values a function reaches from outside its own scope.
 
     Args:
         func: The function to check.
 
     Returns:
-        List[Any]: The nonlocal variables accessed by the function.
+        Every captured cell value, the globals the function names, and each
+        value along an attribute path it loads. Over-approximates: a value can
+        come back without the function reaching it at runtime.
     """
-    try:
-        code = inspect.getsource(func)
-        tree = ast.parse(textwrap.dedent(code))
-        visitor = FunctionNonLocals()
-        visitor.visit(tree)
-        values: list[Any] = []
-        closure = (
-            inspect.getclosurevars(func.__wrapped__)
-            if hasattr(func, "__wrapped__") and callable(func.__wrapped__)
-            else inspect.getclosurevars(func)
-        )
-        candidates = {**closure.globals, **closure.nonlocals}
-        for k, v in candidates.items():
-            if k in visitor.nonlocals:
-                values.append(v)
-            for kk in visitor.nonlocals:
-                if "." in kk and kk.startswith(k):
-                    vv = v
-                    for part in kk.split(".")[1:]:
-                        if vv is None:
-                            break
-                        else:
-                            try:
-                                vv = getattr(vv, part)
-                            except AttributeError:
-                                break
-                    else:
-                        values.append(vv)
-    except (SyntaxError, TypeError, OSError, SystemError):
+    func = getattr(func, "__func__", func)  # bound method -> function
+    wrapped = getattr(func, "__wrapped__", None)
+    if callable(wrapped):
+        func = getattr(wrapped, "__func__", wrapped)
+    if not isinstance(func, FunctionType):
         return []
+    code = func.__code__
 
+    cells: dict[str, Any] = {}
+    for name, cell in zip(code.co_freevars, func.__closure__ or ()):
+        try:
+            cells[name] = cell.cell_contents
+        except ValueError:
+            continue  # empty cell: a recursive def not yet bound
+
+    # Every captured value counts, referenced or not: over-declaring costs an
+    # introspection entry, under-declaring drops the subgraph's checkpoints and
+    # stream events. Checking each cell against the bytecode would cost more and
+    # only trade the cheap error for the expensive one.
+    values: list[Any] = list(cells.values())
+    global_ns = func.__globals__
+    globals_ = {name: global_ns[name] for name in code.co_names if name in global_ns}
+    if all(type(v) in _LEAF_TYPES for v in (*cells.values(), *globals_.values())):
+        return values
+
+    # Nested code objects hold the references made by inner defs, lambdas and
+    # comprehensions, which resolve against the namespaces gathered above.
+    codes = [code]
+    for c in codes:
+        codes.extend(k for k in c.co_consts if isinstance(k, CodeType))
+        value: Any = None
+        for instruction in dis.get_instructions(c):
+            opname = instruction.opname
+            if opname == "LOAD_GLOBAL":
+                value = globals_.get(instruction.argval)
+            elif opname == "LOAD_DEREF":
+                value = cells.get(instruction.argval)
+            elif opname in ("LOAD_ATTR", "LOAD_METHOD"):
+                value = getattr(value, instruction.argval, None)
+            else:
+                value = None  # anything else ends the chain: `a, b.c` is not `a.c`
+                continue
+            if value is not None:
+                values.append(value)
     return values
 
 
-class FunctionNonLocals(ast.NodeVisitor):
-    """Get the nonlocal variables accessed of a function."""
-
-    def __init__(self) -> None:
-        self.nonlocals: set[str] = set()
-
-    @override
-    def visit_FunctionDef(self, node: ast.FunctionDef) -> Any:
-        """Visit a function definition.
-
-        Args:
-            node: The node to visit.
-
-        Returns:
-            Any: The result of the visit.
-        """
-        visitor = NonLocals()
-        visitor.visit(node)
-        self.nonlocals.update(visitor.loads - visitor.stores)
-
-    @override
-    def visit_AsyncFunctionDef(self, node: ast.AsyncFunctionDef) -> Any:
-        """Visit an async function definition.
-
-        Args:
-            node: The node to visit.
-
-        Returns:
-            Any: The result of the visit.
-        """
-        visitor = NonLocals()
-        visitor.visit(node)
-        self.nonlocals.update(visitor.loads - visitor.stores)
-
-    @override
-    def visit_Lambda(self, node: ast.Lambda) -> Any:
-        """Visit a lambda function.
-
-        Args:
-            node: The node to visit.
-
-        Returns:
-            Any: The result of the visit.
-        """
-        visitor = NonLocals()
-        visitor.visit(node)
-        self.nonlocals.update(visitor.loads - visitor.stores)
-
-
-class NonLocals(ast.NodeVisitor):
-    """Get nonlocal variables accessed."""
-
-    def __init__(self) -> None:
-        self.loads: set[str] = set()
-        self.stores: set[str] = set()
-
-    @override
-    def visit_Name(self, node: ast.Name) -> Any:
-        """Visit a name node.
-
-        Args:
-            node: The node to visit.
-
-        Returns:
-            Any: The result of the visit.
-        """
-        if isinstance(node.ctx, ast.Load):
-            self.loads.add(node.id)
-        elif isinstance(node.ctx, ast.Store):
-            self.stores.add(node.id)
-
-    @override
-    def visit_Attribute(self, node: ast.Attribute) -> Any:
-        """Visit an attribute node.
-
-        Args:
-            node: The node to visit.
-
-        Returns:
-            Any: The result of the visit.
-        """
-        if isinstance(node.ctx, ast.Load):
-            parent = node.value
-            attr_expr = node.attr
-            while isinstance(parent, ast.Attribute):
-                attr_expr = parent.attr + "." + attr_expr
-                parent = parent.value
-            if isinstance(parent, ast.Name):
-                self.loads.add(parent.id + "." + attr_expr)
-                self.loads.discard(parent.id)
-            elif isinstance(parent, ast.Call):
-                if isinstance(parent.func, ast.Name):
-                    self.loads.add(parent.func.id)
-                else:
-                    parent = parent.func
-                    attr_expr = ""
-                    while isinstance(parent, ast.Attribute):
-                        if attr_expr:
-                            attr_expr = parent.attr + "." + attr_expr
-                        else:
-                            attr_expr = parent.attr
-                        parent = parent.value
-                    if isinstance(parent, ast.Name):
-                        self.loads.add(parent.id + "." + attr_expr)
-
-
 def is_xxh3_128_hexdigest(value: str) -> bool:
     """Check if the given string matches the format of xxh3_128_hexdigest."""
     return bool(re.fullmatch(r"[0-9a-f]{32}", value))

libs/langgraph/langgraph/pregel/main.py

@@ -108,7 +108,6 @@ from langgraph.callbacks import (
     get_sync_graph_callback_manager_for_config,
 )
 from langgraph.channels.base import BaseChannel
-from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.topic import Topic
 from langgraph.config import get_config
 from langgraph.constants import END
@@ -133,7 +132,9 @@ from langgraph.pregel._checkpoint import (
     channels_from_checkpoint,
     copy_checkpoint,
     create_checkpoint,
+    create_checkpoint_plan_for_update_state_api,
     empty_checkpoint,
+    get_updated_channels_from_tasks,
 )
 from langgraph.pregel._draw import draw_graph
 from langgraph.pregel._io import map_input, read_channels
@@ -1996,35 +1997,14 @@ class Pregel(
                         },
                     ),
                 )
-            # save task writes
-            has_delta_writes = any(
-                isinstance(channels.get(c), DeltaChannel)
-                for task in run_tasks
-                for c, _ in task.writes
-            )
-            should_put_writes = saved is not None or has_delta_writes
-
-            if saved is None and has_delta_writes:
-                # If there is no previous checkpoint, we need to create a stub checkpoint
-                # so the first delta writes has a parent to anchor under.
-                # This is the model of DeltaChannel.
-                stub = empty_checkpoint()
-                checkpoint_config = checkpointer.put(
-                    patch_configurable(
-                        checkpoint_config, {CONFIG_KEY_CHECKPOINT_ID: None}
-                    ),
-                    stub,
-                    {"source": "update", "step": -1, "parents": {}},
-                    {},
-                )
-
-            for task_id, task in zip(run_task_ids, run_tasks):
-                # channel writes are saved to current checkpoint
-                channel_writes = [w for w in task.writes if w[0] != PUSH]
-                if should_put_writes and channel_writes:
-                    checkpointer.put_writes(checkpoint_config, channel_writes, task_id)
-
-            # apply to checkpoint and save
+            updated_channels = get_updated_channels_from_tasks(run_tasks)
+            if saved is not None:
+                for task_id, task in zip(run_task_ids, run_tasks):
+                    channel_writes = [w for w in task.writes if w[0] != PUSH]
+                    if channel_writes:
+                        checkpointer.put_writes(
+                            checkpoint_config, channel_writes, task_id
+                        )
             apply_writes(
                 checkpoint,
                 channels,
@@ -2032,21 +2012,35 @@ class Pregel(
                 checkpointer.get_next_version,
                 self.trigger_to_nodes,
             )
-            checkpoint = create_checkpoint(checkpoint, channels, step + 1)
+            channels_to_snapshot, checkpoint_metadata = (
+                create_checkpoint_plan_for_update_state_api(
+                    channels,
+                    updated_channels,
+                    step=step + 1,
+                    parents=saved.metadata.get("parents", {}) if saved else {},
+                    saved_metadata=saved.metadata if saved else None,
+                    is_fresh_thread=saved is None,
+                )
+            )
+            checkpoint = create_checkpoint(
+                checkpoint,
+                channels,
+                step + 1,
+                updated_channels=updated_channels if channels_to_snapshot else None,
+                get_next_version=checkpointer.get_next_version
+                if channels_to_snapshot
+                else None,
+                channels_to_snapshot=channels_to_snapshot,
+            )
             next_config = checkpointer.put(
                 checkpoint_config,
                 checkpoint,
-                {
-                    "source": "update",
-                    "step": step + 1,
-                    "parents": saved.metadata.get("parents", {}) if saved else {},
-                },
+                checkpoint_metadata,
                 get_new_channel_versions(
                     checkpoint_previous_versions, checkpoint["channel_versions"]
                 ),
             )
             for task_id, task in zip(run_task_ids, run_tasks):
-                # save push writes
                 if push_writes := [w for w in task.writes if w[0] == PUSH]:
                     checkpointer.put_writes(next_config, push_writes, task_id)
 
@@ -2463,36 +2457,14 @@ class Pregel(
                         },
                     ),
                 )
-            # save task writes
-            has_delta_writes = any(
-                isinstance(channels.get(c), DeltaChannel)
-                for task in run_tasks
-                for c, _ in task.writes
-            )
-            should_put_writes = saved is not None or has_delta_writes
-
-            if saved is None and has_delta_writes:
-                # If there is no previous checkpoint, we need to create a stub checkpoint
-                # so the first delta writes has a parent to anchor under.
-                # This is the model of DeltaChannel.
-                stub = empty_checkpoint()
-                checkpoint_config = await checkpointer.aput(
-                    patch_configurable(
-                        checkpoint_config, {CONFIG_KEY_CHECKPOINT_ID: None}
-                    ),
-                    stub,
-                    {"source": "update", "step": -1, "parents": {}},
-                    {},
-                )
-
-            for task_id, task in zip(run_task_ids, run_tasks):
-                # channel writes are saved to current checkpoint
-                channel_writes = [w for w in task.writes if w[0] != PUSH]
-                if should_put_writes and channel_writes:
-                    await checkpointer.aput_writes(
-                        checkpoint_config, channel_writes, task_id
-                    )
-            # apply to checkpoint and save
+            updated_channels = get_updated_channels_from_tasks(run_tasks)
+            if saved is not None:
+                for task_id, task in zip(run_task_ids, run_tasks):
+                    channel_writes = [w for w in task.writes if w[0] != PUSH]
+                    if channel_writes:
+                        await checkpointer.aput_writes(
+                            checkpoint_config, channel_writes, task_id
+                        )
             apply_writes(
                 checkpoint,
                 channels,
@@ -2500,22 +2472,35 @@ class Pregel(
                 checkpointer.get_next_version,
                 self.trigger_to_nodes,
             )
-            checkpoint = create_checkpoint(checkpoint, channels, step + 1)
-            # save checkpoint, after applying writes
+            channels_to_snapshot, checkpoint_metadata = (
+                create_checkpoint_plan_for_update_state_api(
+                    channels,
+                    updated_channels,
+                    step=step + 1,
+                    parents=saved.metadata.get("parents", {}) if saved else {},
+                    saved_metadata=saved.metadata if saved else None,
+                    is_fresh_thread=saved is None,
+                )
+            )
+            checkpoint = create_checkpoint(
+                checkpoint,
+                channels,
+                step + 1,
+                updated_channels=updated_channels if channels_to_snapshot else None,
+                get_next_version=checkpointer.get_next_version
+                if channels_to_snapshot
+                else None,
+                channels_to_snapshot=channels_to_snapshot,
+            )
             next_config = await checkpointer.aput(
                 checkpoint_config,
                 checkpoint,
-                {
-                    "source": "update",
-                    "step": step + 1,
-                    "parents": saved.metadata.get("parents", {}) if saved else {},
-                },
+                checkpoint_metadata,
                 get_new_channel_versions(
                     checkpoint_previous_versions, checkpoint["channel_versions"]
                 ),
             )
             for task_id, task in zip(run_task_ids, run_tasks):
-                # save push writes
                 if push_writes := [w for w in task.writes if w[0] == PUSH]:
                     await checkpointer.aput_writes(next_config, push_writes, task_id)
             return patch_checkpoint_map(next_config, saved.metadata if saved else None)
@@ -3527,7 +3512,7 @@ class Pregel(
         control: RunControl | None = None,
         transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
         **kwargs: Any,
-    ) -> Any:
+    ) -> GraphRunStream:
         """Internal v3 sync streaming implementation. Public entry: stream_events(version='v3').
 
         Extra keyword arguments are forwarded to the underlying ``stream(...)``
@@ -3583,7 +3568,7 @@ class Pregel(
         control: RunControl | None = None,
         transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
         **kwargs: Any,
-    ) -> Any:
+    ) -> AsyncGraphRunStream:
         """Internal v3 async streaming implementation. Public entry: astream_events(version='v3').
 
         Extra keyword arguments are forwarded to the underlying ``astream(...)``
@@ -3648,7 +3633,7 @@ class Pregel(
         control: RunControl | None = None,
         transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
         **kwargs: Any,
-    ) -> Any: ...
+    ) -> GraphRunStream: ...
 
     def stream_events(
         self,
@@ -3753,7 +3738,7 @@ class Pregel(
         control: RunControl | None = None,
         transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
         **kwargs: Any,
-    ) -> Awaitable[Any]: ...
+    ) -> Awaitable[AsyncGraphRunStream]: ...
 
     def astream_events(
         self,

libs/langgraph/langgraph/stream/run_stream.py

@@ -12,7 +12,13 @@ from langgraph.stream._mux import StreamMux
 from langgraph.stream._types import ProtocolEvent
 
 if TYPE_CHECKING:
-    from langgraph.stream.transformers import SubgraphStatus
+    from langchain_core.language_models.chat_model_stream import (
+        AsyncChatModelStream,
+        ChatModelStream,
+    )
+
+    from langgraph.stream.stream_channel import StreamChannel
+    from langgraph.stream.transformers import LifecyclePayload, SubgraphStatus
 
 
 def _drive_until_done(pump: Callable[[], bool]) -> None:
@@ -48,6 +54,16 @@ class GraphRunStream:
         experimental and may change.
     """
 
+    # Native projections always registered by `stream_events(version="v3")`.
+    # Attached dynamically by the `setattr` loop in `__init__`; declared here
+    # so type checkers see them. Opt-in native projections (`updates`,
+    # `custom`, `checkpoints`, `debug`, `tasks`) are only present when their
+    # transformer is registered, so they are reached via `extensions[...]`.
+    values: StreamChannel[dict[str, Any]]
+    messages: StreamChannel[ChatModelStream]
+    lifecycle: StreamChannel[LifecyclePayload]
+    subgraphs: StreamChannel[SubgraphRunStream]
+
     def __init__(
         self,
         graph_iter: Iterator[Any] | None,
@@ -132,13 +148,23 @@ class GraphRunStream:
     def abort(self) -> None:
         """Stop the run early.
 
-        Closes the mux and marks the stream exhausted. The graph
-        iterator is dropped; any in-flight nodes see the closure on
-        their next yield point. Idempotent.
+        Closes the underlying graph iterator (propagating `GeneratorExit`
+        so in-flight nodes and subgraphs are cancelled), closes the mux,
+        and marks the stream exhausted. Idempotent.
         """
         if self._exhausted:
             return
         self._exhausted = True
+        graph_iter = self._graph_iter
+        self._graph_iter = None
+        if (
+            graph_iter is not None
+            and (close := getattr(graph_iter, "close", None)) is not None
+        ):
+            try:
+                close()
+            except Exception:
+                pass
         try:
             self._mux.close()
         except Exception:
@@ -319,6 +345,16 @@ class AsyncGraphRunStream:
         experimental and may change.
     """
 
+    # Native projections always registered by `astream_events(version="v3")`.
+    # Attached dynamically by the `setattr` loop in `__init__`; declared here
+    # so type checkers see them. Opt-in native projections (`updates`,
+    # `custom`, `checkpoints`, `debug`, `tasks`) are only present when their
+    # transformer is registered, so they are reached via `extensions[...]`.
+    values: StreamChannel[dict[str, Any]]
+    messages: StreamChannel[AsyncChatModelStream]
+    lifecycle: StreamChannel[LifecyclePayload]
+    subgraphs: StreamChannel[AsyncSubgraphRunStream]
+
     def __init__(
         self,
         graph_aiter: AsyncIterator[Any] | None,
@@ -348,6 +384,8 @@ class AsyncGraphRunStream:
         self._scope_list: list[str] = list(mux.scope)
         self._pump_cond = asyncio.Condition()
         self._pumping = False
+        self._anext_task: asyncio.Future[Any] | None = None
+        self._aborting = False
         for key in mux.native_keys:
             setattr(self, key, mux.extensions[key])
         if wire_pump:
@@ -407,7 +445,25 @@ class AsyncGraphRunStream:
 
         try:
             try:
-                part = await self._graph_aiter.__anext__()
+                # Run the pull as a child task so `abort()` can cancel it
+                # mid-flight. Cancelling propagates `CancelledError` into the
+                # graph generator frame -> Pregel loop -> nested subgraph
+                # nodes, which a bare `aclose()` cannot do while the generator
+                # is running ("asynchronous generator is already running").
+                self._anext_task = asyncio.ensure_future(self._graph_aiter.__anext__())
+                try:
+                    part = await self._anext_task
+                except asyncio.CancelledError:
+                    if self._aborting:
+                        # Abort-initiated cancel: stop gracefully.
+                        self._exhausted = True
+                        return False
+                    # Genuine external cancel of this task: also stop the
+                    # in-flight pull, then propagate.
+                    self._anext_task.cancel()
+                    raise
+                finally:
+                    self._anext_task = None
                 event = convert_to_protocol_event(part)
                 self._observe_event(event)
                 await self._mux.apush(event)
@@ -428,15 +484,40 @@ class AsyncGraphRunStream:
     async def abort(self) -> None:
         """Stop the run early.
 
-        Marks the stream exhausted, wakes any pump-waiters, and closes
-        the mux. Any `apush` blocked on backpressure wakes and returns
-        without appending. Idempotent.
+        Marks the stream exhausted and wakes any pump-waiters. Cancels an
+        in-flight pull if one is running, then closes the underlying graph
+        iterator, so running nodes and nested subgraphs are cancelled
+        whether or not a pump is mid-pull. Closes the mux; any `apush`
+        blocked on backpressure wakes and returns without appending.
+        Idempotent.
         """
         async with self._pump_cond:
             if self._exhausted:
                 return
             self._exhausted = True
+            self._aborting = True
+            graph_aiter = self._graph_aiter
+            self._graph_aiter = None
+            anext_task = self._anext_task
             self._pump_cond.notify_all()
+        # If a pump is mid-pull, cancel it so the cancellation propagates
+        # into running nodes and nested subgraphs. Once it settles the
+        # generator is no longer running, so the `aclose()` below is a safe
+        # final cleanup (and handles the no-in-flight-pull case directly).
+        if anext_task is not None and not anext_task.done():
+            anext_task.cancel()
+            try:
+                await anext_task
+            except (asyncio.CancelledError, Exception):
+                pass
+        if (
+            graph_aiter is not None
+            and (aclose := getattr(graph_aiter, "aclose", None)) is not None
+        ):
+            try:
+                await aclose()
+            except Exception:
+                pass
         try:
             await self._mux.aclose()
         except Exception:

libs/langgraph/langgraph/types.py

@@ -70,6 +70,8 @@ __all__ = (
     "RetryPolicy",
     "TimeoutPolicy",
     "CachePolicy",
+    "TracePolicy",
+    "omit_payload",
     "Interrupt",
     "StateUpdate",
     "PregelTask",
@@ -527,6 +529,44 @@ class CachePolicy(Generic[KeyFuncT]):
     """Time to live for the cache entry in seconds. If `None`, the entry never expires."""
 
 
+@dataclass(**_DC_KWARGS)
+class TracePolicy:
+    """Configuration for how a node's run is traced.
+
+    Scope: this only transforms what the node's *own* run records. Child runs created
+    by a traced `bound` runnable and the root graph run are not affected. Plain
+    function nodes are traced with `trace=False`, so they have no such child runs.
+
+    Not intended to redact secrets. To redact inputs/outputs across all runs
+    (children included), use the LangSmith client's
+    `hide_inputs`/`hide_outputs`/`anonymizer` instead.
+
+    Each processor receives the node's raw input/output value (not a normalized
+    kwargs dict) and returns the value to record.
+    """
+
+    process_inputs: Callable[[Any], Any] | None = None
+    """Optional callable to transform the node's input before it is recorded on the
+    node's trace run. Can be used to omit or summarize large payloads
+    (e.g. message history). Not intended to affect the value passed to the node; avoid
+    mutating arguments in place."""
+
+    process_outputs: Callable[[Any], Any] | None = None
+    """Optional callable to transform the node's output before it is recorded on the
+    node's trace run. Can be used to omit or summarize large payloads
+    (e.g. message history). Not intended to affect the value returned by the node; avoid
+    mutating arguments in place."""
+
+
+def omit_payload(_value: Any) -> dict[str, Any]:
+    """`TracePolicy` helper that records an empty payload, dropping the value entirely.
+
+    Use as `process_inputs` and/or `process_outputs` on a `TracePolicy` to keep a node's
+    span and its timing while omitting its inputs/outputs from the trace.
+    """
+    return {}
+
+
 _DEFAULT_INTERRUPT_ID = "placeholder-id"
 
 
@@ -976,3 +1016,9 @@ class Overwrite:
 
     value: Any
     """The value to write directly to the channel, bypassing any reducer."""
+
+    type: Literal["__overwrite__"] = "__overwrite__"
+    """Discriminator field. Lets the channel reducer recognise an `Overwrite`
+    even after its dataclass form is JSON-serialised and the typed instance
+    is lost (e.g. an `orjson`-encoded state update routed through the
+    LangGraph API server)."""

libs/langgraph/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph"
-version = "1.2.4"
+version = "1.2.11"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -24,7 +24,7 @@ classifiers = [
     'Programming Language :: Python :: 3.13',
 ]
 dependencies = [
-    "langchain-core>=1.4.0,<2",
+    "langchain-core>=1.4.7,<2",
     "langgraph-checkpoint>=4.1.0,<5.0.0",
     "langgraph-sdk>=0.4.2,<0.5.0",
     "langgraph-prebuilt>=1.1.0,<1.2.0",
@@ -89,8 +89,12 @@ langgraph-sdk = { path = "../sdk-py", editable = true }
 langgraph-cli = { path = "../cli", editable = true }
 
 [tool.ruff]
-lint.select = [ "E", "F", "I", "TID251", "UP" ]
+lint.select = [ "E", "F", "I", "PLC0415", "RUF100", "TID251", "UP" ]
 lint.ignore = [ "E501" ]
+# 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"] }
 line-length = 88
 indent-width = 4
 extend-include = ["*.ipynb"]

libs/langgraph/tests/memory_assert.py

@@ -1,5 +1,6 @@
 import os
 import tempfile
+import time
 from collections import defaultdict
 from functools import partial
 from typing import Any
@@ -73,8 +74,6 @@ class MemorySaverAssertImmutable(InMemorySaver):
         new_versions: ChannelVersions,
     ) -> None:
         if self.put_sleep:
-            import time
-
             time.sleep(self.put_sleep)
         # assert checkpoint hasn't been modified since last written
         thread_id = config["configurable"]["thread_id"]

libs/langgraph/tests/test_channels.py

@@ -2,14 +2,16 @@ import operator
 from collections.abc import Sequence
 from typing import Annotated
 
+import orjson
 import pytest
 from langchain_core.messages import AIMessage, HumanMessage, RemoveMessage
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from typing_extensions import NotRequired, TypedDict
 
+from langgraph._internal._constants import OVERWRITE
 from langgraph._internal._typing import MISSING
-from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.binop import BinaryOperatorAggregate, _get_overwrite
 from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.topic import Topic
@@ -186,6 +188,43 @@ def test_delta_channel_overwrite() -> None:
     assert ch.get()[0].content == "new"
 
 
+def test_overwrite_dataclass_form_survives_json_roundtrip() -> None:
+    """`Overwrite` serialised with `orjson` collapses to a plain dict but
+    must still be recognised as an overwrite by the channel reducer.
+
+    Without the `type` discriminator the dataclass-erased shape (`{"value":
+    ...}`) is indistinguishable from a literal channel value, and downstream
+    reducers raise `MESSAGE_COERCION_FAILURE` (or similar) on read.
+    """
+
+    ow = Overwrite(value=[HumanMessage(content="new", id="h2")])
+    erased = orjson.loads(orjson.dumps(ow, default=lambda o: o.model_dump()))
+
+    assert erased["type"] == OVERWRITE
+    is_overwrite, value = _get_overwrite(erased)
+    assert is_overwrite
+    assert isinstance(value, list)
+    assert value[0]["content"] == "new"
+
+
+def test_overwrite_sentinel_dict_still_recognised() -> None:
+    """The pre-existing `{"__overwrite__": value}` dict form continues to be
+    recognised. This is the canonical sentinel emitted by producers that do
+    not have an `Overwrite` dataclass available."""
+
+    is_overwrite, value = _get_overwrite({OVERWRITE: ["b"]})
+    assert is_overwrite
+    assert value == ["b"]
+
+
+def test_overwrite_non_matching_dict_not_recognised() -> None:
+    """Dicts that resemble the erased shape but do not carry the
+    `__overwrite__` discriminator must not be misclassified as overwrites."""
+
+    assert _get_overwrite({"value": ["b"]}) == (False, None)
+    assert _get_overwrite({"type": "human", "value": "hi"}) == (False, None)
+
+
 def test_delta_channel_remove_message_and_replay() -> None:
     """RemoveMessage must round-trip correctly when writes are replayed."""
     spec = DeltaChannel(_messages_delta_reducer, list)
@@ -397,6 +436,93 @@ def test_delta_channel_inmemory_saver_assembles_writes() -> None:
     assert len(state.values["messages"]) == 4  # 2 human + 2 AI
 
 
+def test_delta_channel_overwrite_superstep_snapshots() -> None:
+    def reducer(state: list[str], writes: Sequence[list[str]]) -> list[str]:
+        result = list(state)
+        for write in writes:
+            result.extend(write)
+        return result
+
+    class State(TypedDict):
+        items: Annotated[
+            list[str], DeltaChannel(reducer, list, snapshot_frequency=1000)
+        ]
+
+    def node_a(state: State) -> dict:
+        return {"items": ["a"]}
+
+    def node_b(state: State) -> dict:
+        return {"items": Overwrite(["b"])}
+
+    def node_c(state: State) -> dict:
+        return {"items": ["c"]}
+
+    builder = StateGraph(State)
+    builder.add_node("node_a", node_a)
+    builder.add_node("node_b", node_b)
+    builder.add_node("node_c", node_c)
+    builder.add_edge(START, "node_a")
+    builder.add_edge("node_a", "node_b")
+    builder.add_edge("node_a", "node_c")
+
+    saver = InMemorySaver()
+    graph = builder.compile(checkpointer=saver)
+    config = {"configurable": {"thread_id": "overwrite-snapshot"}}
+
+    result = graph.invoke({"items": ["START"]}, config)
+    assert result == {"items": ["b"]}
+
+    saved = saver.get_tuple(config)
+    assert saved is not None
+    snapshot = saved.checkpoint["channel_values"].get("items")
+    assert isinstance(snapshot, _DeltaSnapshot)
+    assert snapshot.value == ["b"]
+    assert saved.metadata.get("counters_since_delta_snapshot", {}).get("items") is None
+
+
+def test_delta_channel_replay_after_overwrite_snapshot() -> None:
+    def reducer(state: list[str], writes: Sequence[list[str]]) -> list[str]:
+        result = list(state)
+        for write in writes:
+            result.extend(write)
+        return result
+
+    class State(TypedDict):
+        items: Annotated[
+            list[str], DeltaChannel(reducer, list, snapshot_frequency=1000)
+        ]
+
+    calls = 0
+
+    def node(state: State) -> dict:
+        nonlocal calls
+        calls += 1
+        if calls == 1:
+            return {"items": Overwrite(["reset"])}
+        return {"items": ["after"]}
+
+    builder = StateGraph(State)
+    builder.add_node("node", node)
+    builder.add_edge(START, "node")
+
+    saver = InMemorySaver()
+    graph = builder.compile(checkpointer=saver)
+    config = {"configurable": {"thread_id": "overwrite-replay"}}
+
+    assert graph.invoke({"items": ["before"]}, config) == {"items": ["reset"]}
+    first_saved = saver.get_tuple(config)
+    assert first_saved is not None
+    assert isinstance(
+        first_saved.checkpoint["channel_values"].get("items"), _DeltaSnapshot
+    )
+
+    assert graph.invoke({"items": []}, config) == {"items": ["reset", "after"]}
+    second_saved = saver.get_tuple(config)
+    assert second_saved is not None
+    assert "items" not in second_saved.checkpoint["channel_values"]
+    assert graph.get_state(config).values == {"items": ["reset", "after"]}
+
+
 # ---------------------------------------------------------------------------
 # DeltaChannel — dict reducer
 # ---------------------------------------------------------------------------