release(langgraph): 1.2.3 (#7945)

## Problem

Fixes #7953.

The v3 SSE and WebSocket stream transports build their default paths by
interpolating `thread_id` directly into the URL:

```python
self._commands_url = commands_path or f"/threads/{thread_id}/commands"
self._stream_url   = stream_path   or f"/threads/{thread_id}/stream/events"
```

This skips the `_quote_path_param` escaping that the rest of the SDK
adopted in #7893. A `thread_id` containing reserved characters or
dot-segments is then normalized by the HTTP/WebSocket stack before
transmission. For example, `thread_id = "../assistants/abc"`:

| | before |
|---|---|
| constructed | `/threads/../assistants/abc/commands` |
| wire path | `/assistants/abc/commands` |

So the value stops being one opaque identifier under
`/threads/{thread_id}/...` and silently hits a different resource.

## Fix

Reuse the existing `_quote_path_param` helper for the **default** paths
in all four transports (`http`, `sync_http`, `ws`, `sync_ws`). Explicit
`commands_path` / `stream_path` overrides are left untouched, so callers
that pass their own paths opt out of encoding as before.

`_quote_path_param("../assistants/abc")` → `..%2Fassistants%2Fabc`,
which the HTTP/WS stack no longer collapses.

## Tests

Adds `tests/streaming/test_transport_path_encoding.py` covering all four
transports:
- default `_commands_url` / `_stream_url` / `_stream_path` are
percent-encoded,
- the actual SSE wire path (async + sync) stays under `/threads/`,
- the built WebSocket URL (async + sync) stays under `/threads/`,
- explicit path overrides are left untouched.

`make format`, `make lint`, and `make test` all pass in `libs/sdk-py`
(491 passed).

.github/workflows/_integration_test.yml

@@ -121,8 +121,8 @@ jobs:
             exit 1
           fi
           LANGCHAIN_OPENAI_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-openai'); print(v);")
-          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.0.1" ]; then
-            echo "LANGCHAIN_OPENAI_VERSION != 1.0.1; $LANGCHAIN_OPENAI_VERSION"
+          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.1.14" ]; then
+            echo "LANGCHAIN_OPENAI_VERSION != 1.1.14; $LANGCHAIN_OPENAI_VERSION"
             exit 1
           fi
           LANGCHAIN_ANTHROPIC_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-anthropic'); print(v);")

.github/workflows/_sdk_integration_test.yml

@@ -0,0 +1,85 @@
+name: sdk-py integration test
+
+on:
+  workflow_call:
+    secrets:
+      LANGSMITH_API_KEY:
+        required: false
+      DOCKERHUB_USERNAME:
+        required: false
+      DOCKERHUB_RO_TOKEN:
+        required: false
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: "sdk-py integration"
+    defaults:
+      run:
+        working-directory: libs/sdk-py
+    env:
+      HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: ./.github/actions/uv_setup
+        with:
+          python-version: "3.13"
+          cache-suffix: sdk-py-integration
+          working-directory: libs/sdk-py
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
+        if: ${{ !github.event.pull_request.head.repo.fork }}
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_RO_TOKEN }}
+
+      - name: Install dependencies
+        shell: bash
+        run: uv sync --frozen --group test --no-dev
+
+      - name: Skip if LANGSMITH_API_KEY is not available
+        if: env.HAS_LANGSMITH_API_KEY != 'true'
+        run: |
+          echo "LANGSMITH_API_KEY is not set (likely a fork PR). Skipping integration tests."
+          exit 0
+
+      - name: Bring up integration stack
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        env:
+          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+        run: docker compose up -d --build
+
+      - name: Wait for API healthcheck
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        run: |
+          for i in $(seq 1 60); do
+            if curl -sf http://localhost:2024/ok >/dev/null; then
+              echo "API ready after ${i}s"
+              exit 0
+            fi
+            sleep 2
+          done
+          echo "API failed to become healthy within 120s"
+          docker compose -f libs/sdk-py/integration/docker-compose.yml logs api | tail -100
+          exit 1
+
+      - name: Run integration suite
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        run: uv run pytest tests/integration/ -m integration
+
+      - name: Dump api logs on failure
+        if: failure() && env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        run: docker compose logs api | tail -200
+
+      - name: Tear down stack
+        if: always() && env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        run: docker compose down -v

.github/workflows/_test.yml

@@ -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@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
+        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_langgraph.yml

@@ -31,7 +31,7 @@ jobs:
           cache-suffix: "test-langgraph"
           working-directory: libs/langgraph
       - name: Login to Docker Hub
-        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
+        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_release.yml

@@ -82,7 +82,7 @@ jobs:
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true

.github/workflows/bench.yml

@@ -57,15 +57,19 @@ jobs:
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Annotation
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
+        env:
+          CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
+          BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}
+          COMPARE_OUTPUT: ${{ steps.compare.outputs.OUTPUT }}
         with:
           script: |
-            const file = JSON.parse(`${{ steps.files.outputs.added_modified_renamed }}`)[0]
-            core.notice(`${{ steps.benchmark.outputs.OUTPUT }}`, {
+            const file = JSON.parse(process.env.CHANGED_FILES || "[]")[0]
+            core.notice(process.env.BENCHMARK_OUTPUT || "", {
               title: 'Benchmark results',
               file,
             })
-            core.notice(`${{ steps.compare.outputs.OUTPUT }}`, {
+            core.notice(process.env.COMPARE_OUTPUT || "", {
               title: 'Comparison against main',
               file,
             })

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
     outputs:
       python: ${{ steps.filter.outputs.python || 'true' }}
       deps: ${{ steps.filter.outputs.deps || 'true' }}
+      sdk_py: ${{ steps.filter.outputs.sdk_py || 'true' }}
     steps:
       - uses: actions/checkout@v6
       - uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4
@@ -47,6 +48,10 @@ jobs:
             deps:
               - '**/pyproject.toml'
               - '**/uv.lock'
+            sdk_py:
+              - 'libs/sdk-py/**'
+              - 'libs/langgraph/langgraph/pregel/remote.py'
+              - 'libs/langgraph/langgraph/pregel/_remote_run_stream.py'
 
   lint:
     needs: changes
@@ -156,6 +161,13 @@ jobs:
     uses: ./.github/workflows/_integration_test.yml
     secrets: inherit
 
+  sdk-py-integration-test:
+    needs: changes
+    if: needs.changes.outputs.sdk_py == 'true'
+    name: "sdk-py integration test"
+    uses: ./.github/workflows/_sdk_integration_test.yml
+    secrets: inherit
+
   ci_success:
     name: "CI Success"
     needs:
@@ -166,6 +178,7 @@ jobs:
         check-sdk-methods,
         check-schema,
         integration-test,
+        sdk-py-integration-test,
       ]
     if: |
       always()

.github/workflows/deploy-redirects.yml

@@ -40,7 +40,7 @@ jobs:
         uses: actions/configure-pages@v6
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v5
         with:
           path: 'docs/_site'
 

.github/workflows/release.yml

@@ -32,6 +32,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           cache-suffix: "release"
+          enable-cache: false
           working-directory: ${{ inputs.working-directory }}
 
       # We want to keep this build stage *separate* from the release stage,
@@ -268,6 +269,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           cache-suffix: "release"
+          enable-cache: false
           working-directory: ${{ inputs.working-directory }}
 
       - uses: actions/download-artifact@v8
@@ -276,7 +278,7 @@ jobs:
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true
@@ -309,6 +311,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
           cache-suffix: "release"
+          enable-cache: false
           working-directory: ${{ inputs.working-directory }}
 
       - uses: actions/download-artifact@v8

.github/workflows/reopen_on_assignment.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Find and reopen matching PRs
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         with:
           script: |
             const { owner, repo } = context.repo;

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

@@ -63,7 +63,7 @@ jobs:
       - name: Check if contributor is external
         if: steps.app-token.outcome == 'success'
         id: check-membership
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
@@ -196,7 +196,7 @@ jobs:
           private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
 
       - name: Backfill labels
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         with:
           github-token: ${{ steps.app-token.outputs.token }}
           script: |

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

@@ -48,7 +48,7 @@ jobs:
       - name: Check if contributor is external
         if: steps.app-token.outcome == 'success'
         id: check-membership
-        uses: actions/github-script@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         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@v8
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |

.github/workflows/uv_lock_ugprade.yml

@@ -28,7 +28,7 @@ jobs:
         run: make lock-upgrade
           
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0 # v8
+        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "chore(deps): upgrade dependencies with `uv lock --upgrade`"

.gitignore

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

README.md

@@ -16,7 +16,7 @@
   <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langgraph" alt="PyPI - License"></a>
   <a href="https://pypistats.org/packages/langgraph" target="_blank"><img src="https://img.shields.io/pepy/dt/langgraph" alt="PyPI - Downloads"></a>
   <a href="https://pypi.org/project/langgraph/" target="_blank"><img src="https://img.shields.io/pypi/v/langgraph.svg?label=%20" alt="Version"></a>
-  <a href="https://x.com/langchain" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
+  <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>
 
 <br>
@@ -27,10 +27,10 @@ Trusted by companies shaping the future of agents – including Klarna, Replit,
 pip install -U langgraph
 ```
 
-If you're looking to quickly build agents with LangChain's `create_agent` (built on LangGraph), check out the [LangChain Agents documentation](https://docs.langchain.com/oss/python/langchain/agents).
+> [!TIP]
+> If you're looking to quickly build agents, check out **[Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview)** — a higher-level package built on LangGraph for agents that can plan, use subagents, and leverage file systems for complex tasks.
 
-> [!NOTE]
-> Looking for the JS/TS library? Check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
+For an equivalent JS/TS library, check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
 
 ## Why use LangGraph?
 
@@ -51,7 +51,7 @@ While LangGraph can be used standalone, it also integrates seamlessly with any L
 
 To improve your LLM application development, pair LangGraph with:
 
-- [Deep Agents](https://github.com/langchain-ai/deepagents) *(new!)* – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
+- [Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview) – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
 - [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
 - [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
 - [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).

libs/checkpoint-conformance/README.md

@@ -63,6 +63,7 @@ The suite tests **base** capabilities (required) and **extended** capabilities (
 | `delete_for_runs` | no | `adelete_for_runs` |
 | `copy_thread` | no | `acopy_thread` |
 | `prune` | no | `aprune` |
+| `delta_channel_history` | no | `aget_delta_channel_history` |
 
 Extended capabilities are detected by checking whether the method is overridden from `BaseCheckpointSaver`. If not overridden, those tests are skipped.
 

libs/checkpoint-conformance/langgraph/checkpoint/conformance/capabilities.py

@@ -23,6 +23,7 @@ class Capability(str, Enum):
     DELETE_FOR_RUNS = "delete_for_runs"
     COPY_THREAD = "copy_thread"
     PRUNE = "prune"
+    DELTA_CHANNEL_HISTORY = "delta_channel_history"
 
 
 # Capabilities that every checkpointer must support.
@@ -42,6 +43,7 @@ EXTENDED_CAPABILITIES = frozenset(
         Capability.DELETE_FOR_RUNS,
         Capability.COPY_THREAD,
         Capability.PRUNE,
+        Capability.DELTA_CHANNEL_HISTORY,
     }
 )
 
@@ -57,6 +59,7 @@ _CAPABILITY_METHOD_MAP: dict[Capability, str] = {
     Capability.DELETE_FOR_RUNS: "adelete_for_runs",
     Capability.COPY_THREAD: "acopy_thread",
     Capability.PRUNE: "aprune",
+    Capability.DELTA_CHANNEL_HISTORY: "aget_delta_channel_history",
 }
 
 

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

@@ -9,6 +9,9 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
     run_delete_thread_tests,
 )
+from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
+    run_delta_channel_history_tests,
+)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -24,4 +27,5 @@ __all__ = [
     "run_delete_for_runs_tests",
     "run_copy_thread_tests",
     "run_prune_tests",
+    "run_delta_channel_history_tests",
 ]

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

@@ -0,0 +1,99 @@
+"""Shared fixtures for delta-channel conformance tests.
+
+Builds a parent chain with `_DeltaSnapshot` blobs at known positions via
+direct `aput` / `aput_writes` calls. No langgraph or Pregel dependency.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+from typing import Any
+from uuid import uuid4
+
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
+from langgraph.checkpoint.base.id import uuid6
+
+from langgraph.checkpoint.conformance.test_utils import generate_metadata
+
+
+async def build_delta_chain(
+    saver: BaseCheckpointSaver,
+    *,
+    thread_id: str | None = None,
+    checkpoint_ns: str = "",
+    channel: str = "messages",
+    snapshots_at_steps: Sequence[int] = (0,),
+    total_steps: int = 6,
+    write_value_fn: Any | None = None,
+) -> list[RunnableConfig]:
+    """Build a parent chain with `_DeltaSnapshot` at known positions.
+
+    Args:
+        saver: Checkpointer instance.
+        thread_id: Defaults to a random UUID.
+        checkpoint_ns: Namespace (default root).
+        channel: Channel name used for snapshots and writes.
+        snapshots_at_steps: Steps at which a `_DeltaSnapshot` blob is stored
+            in `channel_values[channel]`. Step 0 is the oldest checkpoint.
+        total_steps: Number of checkpoints in the chain.
+        write_value_fn: Callable(step) -> write value. Defaults to step index.
+
+    Returns:
+        List of stored configs (oldest first), one per step.
+    """
+    if write_value_fn is None:
+
+        def write_value_fn(step: int) -> Any:
+            return step
+
+    from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+    thread_id = thread_id or str(uuid4())
+    snapshot_set = set(snapshots_at_steps)
+    stored: list[RunnableConfig] = []
+    parent_cfg: RunnableConfig | None = None
+
+    for step in range(total_steps):
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": checkpoint_ns,
+            }
+        }
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+
+        channel_values: dict[str, Any] = {}
+        channel_versions: dict[str, int] = {}
+        if step in snapshot_set:
+            channel_values[channel] = _DeltaSnapshot(
+                write_value_fn(step),
+            )
+            channel_versions[channel] = step + 1
+
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=channel_values,
+            channel_versions=channel_versions,
+            versions_seen={},
+            updated_channels=None,
+        )
+        new_versions = dict(channel_versions)
+        parent_cfg = await saver.aput(
+            config, cp, generate_metadata(step=step), new_versions
+        )
+        stored.append(parent_cfg)
+
+        # Write a pending write for non-snapshot steps so the walk has
+        # something to collect.
+        if step not in snapshot_set:
+            await saver.aput_writes(
+                parent_cfg, [(channel, write_value_fn(step))], str(uuid4())
+            )
+
+    return stored

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

@@ -0,0 +1,247 @@
+"""DELTA_CHANNEL_HISTORY capability tests — aget_delta_channel_history contract."""
+
+from __future__ import annotations
+
+import traceback
+from collections.abc import Callable
+from uuid import uuid4
+
+from langgraph.checkpoint.base import BaseCheckpointSaver
+
+from langgraph.checkpoint.conformance.spec._delta_fixtures import build_delta_chain
+
+
+async def test_history_returns_writes_oldest_first(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Writes are returned oldest-to-newest."""
+    tid = str(uuid4())
+    # 5 steps: snapshot at 0, writes at 1,2,3,4.
+    # Head is step 4. Walk starts at step 3 (parent of head).
+    # Collects writes from steps 1,2,3 (between snapshot at 0 and head's parent).
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=5
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert values == [1, 2, 3], f"Expected [1,2,3], got {values}"
+
+
+async def test_history_seed_is_nearest_snapshot(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Seed is the value from the nearest ancestor with channel_values populated."""
+    tid = str(uuid4())
+    # 6 steps: snapshots at 0 and 3, writes at 1,2,4,5.
+    # Head is step 5. Walk from step 4 backward stops at step 3 (snapshot).
+    # Collects writes from step 4 only (between step 3 and head's parent step 4).
+    configs = await build_delta_chain(
+        saver,
+        thread_id=tid,
+        channel="ch",
+        snapshots_at_steps=[0, 3],
+        total_steps=6,
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    assert "seed" in result["ch"], "Expected seed from snapshot at step 3"
+    seed = result["ch"]["seed"]
+    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"]
+    values = [w[2] for w in writes]
+    assert values == [4], f"Expected [4], got {values}"
+
+
+async def test_history_excludes_target_pending_writes(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Target's own pending_writes are NOT included in the history."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
+    )
+    head = configs[-1]
+    # Add writes directly to the head checkpoint
+    await saver.aput_writes(head, [("ch", "extra")], str(uuid4()))
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert "extra" not in values, f"Target's writes should be excluded, got {values}"
+
+
+async def test_history_multi_channel(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Multiple channels have independent walk termination."""
+    tid = str(uuid4())
+    configs: list = []
+    parent_cfg = None
+    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": ""}}
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+        cv: dict = {}
+        cvs: dict = {}
+        if step == 1:
+            cv["a"] = _DeltaSnapshot("snap_a")
+            cvs["a"] = step + 1
+        if step == 3:
+            cv["b"] = _DeltaSnapshot("snap_b")
+            cvs["b"] = step + 1
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=cv,
+            channel_versions=cvs,
+            versions_seen={},
+            updated_channels=None,
+        )
+        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
+        configs.append(parent_cfg)
+        await saver.aput_writes(parent_cfg, [("a", step), ("b", step)], str(uuid4()))
+
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["a", "b"])
+    a_writes = [w[2] for w in result["a"]["writes"]]
+    b_writes = [w[2] for w in result["b"]["writes"]]
+    assert a_writes == [1, 2, 3], f"Expected a writes [1,2,3], got {a_writes}"
+    assert b_writes == [3], f"Expected b writes [3], got {b_writes}"
+
+
+async def test_history_empty_channels_returns_empty(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Empty channels list returns empty mapping."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
+    )
+    result = await saver.aget_delta_channel_history(config=configs[-1], channels=[])
+    assert result == {}
+
+
+async def test_history_walk_to_root_no_seed(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Walk reaches root without finding seed — no 'seed' key in result."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver,
+        thread_id=tid,
+        channel="ch",
+        snapshots_at_steps=[],
+        total_steps=4,
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    assert "seed" not in result["ch"], f"Expected no seed, got {result['ch']}"
+
+
+async def test_history_migration_plain_value_as_seed(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Pre-delta plain value in channel_values acts as seed (migration case).
+
+    When a thread was originally using a regular channel (BinaryOperatorAggregate)
+    and later switches to DeltaChannel, the old checkpoint has a plain value in
+    channel_values[ch] (not a _DeltaSnapshot). The walk should treat it as the
+    seed and terminate there.
+    """
+    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
+
+    for step in range(4):
+        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+        cv: dict = {}
+        cvs: dict = {}
+        # Step 1: plain value (migration case — old checkpoint before delta)
+        if step == 1:
+            cv["ch"] = [10, 20, 30]
+            cvs["ch"] = step + 1
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=cv,
+            channel_versions=cvs,
+            versions_seen={},
+            updated_channels=None,
+        )
+        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
+        configs.append(parent_cfg)
+        if step != 1:
+            await saver.aput_writes(parent_cfg, [("ch", step)], str(uuid4()))
+
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    # Seed should be the plain value from step 1
+    assert "seed" in result["ch"], "Expected seed from migration plain value at step 1"
+    seed = result["ch"]["seed"]
+    assert seed == [10, 20, 30], f"Expected plain value [10,20,30], got {seed}"
+    # Writes should be from step 2 only (between seed at step 1 and head's parent step 2)
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert values == [2], f"Expected [2], got {values}"
+
+
+ALL_DELTA_CHANNEL_HISTORY_TESTS = [
+    test_history_returns_writes_oldest_first,
+    test_history_seed_is_nearest_snapshot,
+    test_history_excludes_target_pending_writes,
+    test_history_multi_channel,
+    test_history_empty_channels_returns_empty,
+    test_history_walk_to_root_no_seed,
+    test_history_migration_plain_value_as_seed,
+]
+
+
+async def run_delta_channel_history_tests(
+    saver: BaseCheckpointSaver,
+    on_test_result: Callable[[str, str, bool, str | None], None] | None = None,
+) -> tuple[int, int, list[str]]:
+    """Run all delta_channel_history tests. Returns (passed, failed, failure_names)."""
+    passed = 0
+    failed = 0
+    failures: list[str] = []
+    for test_fn in ALL_DELTA_CHANNEL_HISTORY_TESTS:
+        try:
+            await test_fn(saver)
+            passed += 1
+            if on_test_result:
+                on_test_result("delta_channel_history", test_fn.__name__, True, None)
+        except Exception:
+            failed += 1
+            msg = f"{test_fn.__name__}: {traceback.format_exc()}"
+            failures.append(msg)
+            if on_test_result:
+                on_test_result(
+                    "delta_channel_history",
+                    test_fn.__name__,
+                    False,
+                    traceback.format_exc(),
+                )
+    return passed, failed, failures

libs/checkpoint-conformance/langgraph/checkpoint/conformance/validate.py

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

libs/checkpoint-conformance/pyproject.toml

@@ -43,7 +43,11 @@ asyncio_mode = "auto"
 # The extended methods (acopy_thread, adelete_for_runs, aprune) are checked
 # at runtime via capability detection and may not exist on the installed
 # base class. Dict literal inference is also overly strict for RunnableConfig.
+# Delta-channel tests import from `langgraph` (not a declared dep of this
+# package — at test time it is installed alongside); private `_DeltaSnapshot`
+# imports are intentional (beta surface).
 unresolved-attribute = "ignore"
+unresolved-import = "ignore"
 invalid-argument-type = "ignore"
 invalid-return-type = "ignore"
 
@@ -58,6 +62,9 @@ lint.select = [
 lint.ignore = ["E501", "B008"]
 target-version = "py310"
 
+[tool.uv.sources]
+langgraph-checkpoint = {path = "../checkpoint", editable = true}
+
 [[tool.uv.index]]
 name = "testpypi"
 url = "https://test.pypi.org/simple/"

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

@@ -2,9 +2,9 @@ from __future__ import annotations
 
 import threading
 from collections import defaultdict
-from collections.abc import Iterator, Sequence
+from collections.abc import Iterator, Mapping, Sequence
 from contextlib import contextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,17 +13,25 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import Capabilities, Connection, Cursor, Pipeline
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import ConnectionPool
 
 from langgraph.checkpoint.postgres import _internal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    _DELTA_PAGE_SIZE,
+    BasePostgresSaver,
+    _build_delta_stage1_sql,
+    _build_delta_stage2_sql,
+    _DeltaStage2Row,
+)
 from langgraph.checkpoint.postgres.shallow import ShallowPostgresSaver
 
 Conn = _internal.Conn  # For backward compatibility
@@ -302,7 +310,10 @@ class PostgresSaver(BasePostgresSaver):
         # others are stored in blobs table
         blob_values = {}
         for k, v in checkpoint["channel_values"].items():
-            if v is None or isinstance(v, (str, int, float, bool)):
+            if isinstance(v, _DeltaSnapshot):
+                blob_values[k] = copy["channel_values"].pop(k)
+                copy["channel_values"][k] = True
+            elif v is None or isinstance(v, (str, int, float, bool)):
                 pass
             else:
                 blob_values[k] = copy["channel_values"].pop(k)
@@ -430,6 +441,114 @@ class PostgresSaver(BasePostgresSaver):
                 with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
+
+        Two-stage query, both stages cover ALL requested channels:
+
+        * Stage 1 (paged): dynamic SELECT over `checkpoints` with K parallel
+          JSONB key lookups (one column pair per channel) — no subquery, no
+          aggregation. Pages newest-first by `checkpoint_id` with a cursor;
+          page size is `_DELTA_PAGE_SIZE`. Stops paging when every channel
+          has found its seed or the chain is exhausted.
+
+        * Stage 2 (per-channel UNION ALL): one branch per channel reading
+          `checkpoint_writes` filtered to that channel's specific
+          `chain_cids`, plus one branch per channel that has a seed reading
+          `checkpoint_blobs` for that channel + version. Avoids the
+          over-fetch of a single `channel = ANY(channels)` filter when
+          channels have different chain depths.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = self.get_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        # Stage 1: paged K-JSONB-lookup scan, walking the parent chain in
+        # Python after each page. Stops as soon as every channel has its seed.
+        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
+        parent_of: dict[str, str | None] = {}
+        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
+        hs_by_i_by_cid: list[dict[str, bool]] = [{} 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}
+        walk_cursor_by_ch: dict[str, str | None] = {}
+        seeded: set[str] = set()
+        cursor: str | None = None
+
+        with self._cursor() as cur:
+            while True:
+                stage1_params: list[Any] = []
+                for ch in channels:
+                    stage1_params.extend([ch, ch])
+                stage1_params.extend(
+                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
+                )
+                cur.execute(stage1_sql, stage1_params)
+                page = cur.fetchall()
+                if not page:
+                    break
+                oldest = self._ingest_stage1_page(
+                    cast("list[Mapping[str, Any]]", page),
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hs_by_i_by_cid,
+                )
+                self._try_advance_walks(
+                    checkpoint_id,
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hs_by_i_by_cid,
+                    chain_by_ch,
+                    seed_ver_by_ch,
+                    walk_cursor_by_ch,
+                    seeded,
+                )
+                # Stop if every channel is seeded, or the page was short
+                # (chain exhausted — no more rows to fetch).
+                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
+                    break
+                cursor = oldest
+
+        # Stage 2: per-channel UNION ALL — one writes branch per channel
+        # with non-empty chain, plus one blob branch per seeded channel.
+        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
+        stage2_sql = _build_delta_stage2_sql(
+            channels_with_chain=channels_with_chain,
+            channels_with_seed=channels_with_seed,
+        )
+
+        if stage2_sql:
+            stage2_params: list[Any] = []
+            for ch in channels_with_chain:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
+            for ch in channels_with_seed:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
+            with self._cursor() as cur:
+                cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cur.fetchall()
+        else:
+            stage2_rows = []
+
+        return self._build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_ver_by_ch=seed_ver_by_ch,
+            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
+        )
+
     def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.

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

@@ -2,9 +2,9 @@ from __future__ import annotations
 
 import asyncio
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import asynccontextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,17 +13,25 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import AsyncConnection, AsyncCursor, AsyncPipeline, Capabilities
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import AsyncConnectionPool
 
 from langgraph.checkpoint.postgres import _ainternal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    _DELTA_PAGE_SIZE,
+    BasePostgresSaver,
+    _build_delta_stage1_sql,
+    _build_delta_stage2_sql,
+    _DeltaStage2Row,
+)
 from langgraph.checkpoint.postgres.shallow import AsyncShallowPostgresSaver
 
 Conn = _ainternal.Conn  # For backward compatibility
@@ -261,7 +269,10 @@ class AsyncPostgresSaver(BasePostgresSaver):
         # others are stored in blobs table
         blob_values = {}
         for k, v in checkpoint["channel_values"].items():
-            if v is None or isinstance(v, (str, int, float, bool)):
+            if isinstance(v, _DeltaSnapshot):
+                blob_values[k] = copy["channel_values"].pop(k)
+                copy["channel_values"][k] = True
+            elif v is None or isinstance(v, (str, int, float, bool)):
                 pass
             else:
                 blob_values[k] = copy["channel_values"].pop(k)
@@ -391,6 +402,97 @@ class AsyncPostgresSaver(BasePostgresSaver):
                 async with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
+
+        See `PostgresSaver.get_delta_channel_history` for design notes; this is
+        the async equivalent with internal stage-1 paging and per-channel
+        UNION ALL stage-2.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = await self.aget_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
+        parent_of: dict[str, str | None] = {}
+        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
+        hs_by_i_by_cid: list[dict[str, bool]] = [{} 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}
+        walk_cursor_by_ch: dict[str, str | None] = {}
+        seeded: set[str] = set()
+        cursor: str | None = None
+
+        async with self._cursor() as cur:
+            while True:
+                stage1_params: list[Any] = []
+                for ch in channels:
+                    stage1_params.extend([ch, ch])
+                stage1_params.extend(
+                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
+                )
+                await cur.execute(stage1_sql, stage1_params)
+                page = await cur.fetchall()
+                if not page:
+                    break
+                oldest = self._ingest_stage1_page(
+                    cast("list[Mapping[str, Any]]", page),
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hs_by_i_by_cid,
+                )
+                self._try_advance_walks(
+                    checkpoint_id,
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hs_by_i_by_cid,
+                    chain_by_ch,
+                    seed_ver_by_ch,
+                    walk_cursor_by_ch,
+                    seeded,
+                )
+                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
+                    break
+                cursor = oldest
+
+        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
+        stage2_sql = _build_delta_stage2_sql(
+            channels_with_chain=channels_with_chain,
+            channels_with_seed=channels_with_seed,
+        )
+
+        if stage2_sql:
+            stage2_params: list[Any] = []
+            for ch in channels_with_chain:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
+            for ch in channels_with_seed:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
+            async with self._cursor() as cur:
+                await cur.execute(stage2_sql, stage2_params)
+                stage2_rows = await cur.fetchall()
+        else:
+            stage2_rows = []
+
+        return self._build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_ver_by_ch=seed_ver_by_ch,
+            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
+        )
+
     async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.

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

@@ -2,20 +2,26 @@ from __future__ import annotations
 
 import random
 import warnings
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from importlib.metadata import version as get_version
-from typing import Any, cast
+from typing import Any, TypedDict, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
     WRITES_IDX_MAP,
     BaseCheckpointSaver,
     ChannelVersions,
+    DeltaChannelHistory,
+    PendingWrite,
     get_checkpoint_id,
 )
 from langgraph.checkpoint.serde.types import TASKS
 from psycopg.types.json import Jsonb
 
+# Page size for stage-1 paged scan in `get_delta_channel_history`. Internal
+# constant — exposing this as a kwarg is left as a follow-up.
+_DELTA_PAGE_SIZE = 1024
+
 MetadataInput = dict[str, Any] | None
 
 try:
@@ -153,6 +159,141 @@ INSERT_CHECKPOINT_WRITES_SQL = """
 """
 
 
+class _DeltaStage2Row(TypedDict, total=False):
+    """One row from `_build_delta_stage2_sql` (a UNION ALL of writes and blobs)."""
+
+    _kind: str  # "w" or "b"
+    checkpoint_id: str | None  # "w" rows only
+    channel: str | None  # set on both "w" and "b" rows
+    type: str | None
+    blob: bytes | None
+    task_id: str | None  # "w" rows only
+    idx: int | None  # "w" rows only
+    version: str | None  # "b" rows only
+
+
+# Multi-channel two-stage DeltaChannel reconstruction.
+#
+# Stage 1 scans checkpoint metadata (no blob bytes) and emits one row per
+# checkpoint with K parallel JSONB key lookups (one column pair per
+# requested delta channel: ver_i / hs_i).  No subqueries, no aggregation.
+# Python walks the parent chain once across all channels.
+#
+# Stage 2 fetches all writes and the seed blobs for ALL channels in a
+# single roundtrip via `channel = ANY(%s)` and chain/seed-version
+# filtering.
+#
+# Empirical comparison vs an alternative "ship full channel_versions /
+# channel_values JSONB and let Python pick" form (1000 checkpoints,
+# 8 total channels in graph, 3 delta channels requested):
+#
+#   Postgres execution:    A=0.24ms vs B=0.38ms   (both negligible)
+#   End-to-end latency:    A=6.83ms vs B=2.28ms   (B is 3.0x faster)
+#   Wire payload:          A=836KB  vs B=330KB    (61% smaller)
+#   Buffer hits:           identical (167 blocks)
+#
+# B (this dynamic-columns design) wins because it avoids JSONB
+# serialization on the wire and JSONB-to-dict deserialization in
+# psycopg.  Even at K=8 (8 delta channels = 16 dynamic columns), B
+# still beats A end-to-end (4.2ms vs 6.8ms).
+
+
+def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
+    """Build stage 1 SQL with 2K parallel JSONB key lookups.
+
+    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,
+               checkpoint -> 'channel_versions' ->> %s AS ver_1,
+               (checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_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).
+
+    Caller must extend params with `[ch_0, ch_0, ch_1, ch_1, ...,
+    thread_id, ns, cursor, cursor, page_size]` when `paged=True`.
+
+    When `paged=False`, the WHERE has no cursor predicate and there's no
+    LIMIT/ORDER BY — kept as a non-public helper for tests/diagnostics.
+    """
+    cols = []
+    for i in range(len(channels)):
+        cols.append(
+            f"checkpoint -> 'channel_versions' ->> %s AS ver_{i}, "
+            f"(checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_{i}"
+        )
+    sql = (
+        "SELECT checkpoint_id, parent_checkpoint_id, "
+        + ", ".join(cols)
+        + " FROM checkpoints WHERE thread_id = %s AND checkpoint_ns = %s"
+    )
+    if paged:
+        sql += (
+            " AND (%s::text IS NULL OR checkpoint_id < %s)"
+            " ORDER BY checkpoint_id DESC LIMIT %s"
+        )
+    return sql
+
+
+def _build_delta_stage2_sql(
+    *,
+    channels_with_chain: Sequence[str],
+    channels_with_seed: Sequence[str],
+) -> str:
+    """Build stage 2 SQL as a per-channel UNION ALL.
+
+    For each channel with a non-empty chain, emit one branch reading
+    `checkpoint_writes` for that specific channel + chain_cids. For each
+    channel with a seed_version, emit one branch reading `checkpoint_blobs`
+    for that channel + version. This avoids the over-fetch of the prior
+    `channel = ANY(channels) AND checkpoint_id = ANY(union)` form when
+    channels have different chain depths.
+
+    The caller must pass parameters in matching order:
+
+        for ch in channels_with_chain:
+            params += [thread_id, checkpoint_ns, ch, chain_cids[ch]]
+        for ch in channels_with_seed:
+            params += [thread_id, checkpoint_ns, ch, seed_version[ch]]
+
+    Returns an empty SQL string if both channel lists are empty (caller
+    must skip executing in that case).
+    """
+    branches: list[str] = []
+    for _ in channels_with_chain:
+        branches.append(
+            "SELECT 'w'::text AS _kind, "
+            "checkpoint_id, channel, "
+            "type, blob, task_id, idx, NULL::text AS version "
+            "FROM checkpoint_writes "
+            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
+            "AND checkpoint_id = ANY(%s)"
+        )
+    for _ in channels_with_seed:
+        branches.append(
+            "SELECT 'b'::text AS _kind, NULL::text AS checkpoint_id, channel, "
+            "type, blob, NULL::text AS task_id, NULL::int AS idx, version "
+            "FROM checkpoint_blobs "
+            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
+            "AND version = %s"
+        )
+    return " UNION ALL ".join(branches)
+
+
+# Stage 1 rows are dynamic-shape dicts: {checkpoint_id, parent_checkpoint_id,
+# ver_0, hs_0, ver_1, hs_1, ...}.  Walking is parameterized by the channel
+# list to map indices back to channel names — no static TypedDict here.
+# `dict[str, Any]` is the practical signature.
+
+
 class BasePostgresSaver(BaseCheckpointSaver[str]):
     SELECT_SQL = SELECT_SQL
     SELECT_PENDING_SENDS_SQL = SELECT_PENDING_SENDS_SQL
@@ -195,6 +336,146 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
             if t.decode() != "empty"
         }
 
+    @staticmethod
+    def _ingest_stage1_page(
+        stage1_rows: Sequence[Mapping[str, Any]],
+        channels: Sequence[str],
+        parent_of: dict[str, str | None],
+        ver_by_i_by_cid: list[dict[str, str | None]],
+        hs_by_i_by_cid: list[dict[str, bool]],
+    ) -> str | None:
+        """Fold one stage-1 page into the running walk-state mappings.
+
+        Returns the oldest checkpoint_id seen on this page (smallest, since
+        pages come back DESC). Caller uses it as the cursor for the next
+        page (`AND checkpoint_id < cursor`).
+        """
+        oldest: str | None = None
+        for r in stage1_rows:
+            cid = cast(str, r["checkpoint_id"])
+            parent_of[cid] = cast("str | None", r["parent_checkpoint_id"])
+            for i in range(len(channels)):
+                ver_by_i_by_cid[i][cid] = cast("str | None", r.get(f"ver_{i}"))
+                hs_by_i_by_cid[i][cid] = bool(r.get(f"hs_{i}"))
+            # Rows are DESC; the last one is the smallest cid in the page.
+            oldest = cid
+        return oldest
+
+    @staticmethod
+    def _try_advance_walks(
+        target_id: str,
+        channels: Sequence[str],
+        parent_of: Mapping[str, str | None],
+        ver_by_i_by_cid: Sequence[Mapping[str, str | None]],
+        hs_by_i_by_cid: Sequence[Mapping[str, bool]],
+        chain_by_ch: dict[str, list[str]],
+        seed_ver_by_ch: dict[str, str | None],
+        walk_cursor_by_ch: dict[str, str | None],
+        seeded: set[str],
+    ) -> None:
+        """Advance each not-yet-seeded channel's walk as far as possible.
+
+        Uses the partial `parent_of` map accumulated so far. A walk stops
+        either because:
+          (a) it found a snapshot for its channel (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.
+        """
+        for i, ch in enumerate(channels):
+            if ch in seeded:
+                continue
+            # First-time entry: cursor starts at the target's parent.
+            if ch not in walk_cursor_by_ch:
+                walk_cursor_by_ch[ch] = parent_of.get(target_id)
+            cur_cid = walk_cursor_by_ch[ch]
+            ch_chain = chain_by_ch[ch]
+            hs_i = hs_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):
+                    seed_ver_by_ch[ch] = ver_i.get(cur_cid)
+                    seeded.add(ch)
+                    cur_cid = None
+                    break
+                cur_cid = parent_of[cur_cid]
+            walk_cursor_by_ch[ch] = cur_cid
+
+    def _build_delta_channels_writes_history(
+        self,
+        *,
+        channels: Sequence[str],
+        chain_by_ch: Mapping[str, list[str]],
+        seed_ver_by_ch: Mapping[str, str | None],
+        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".
+        """
+        # writes_by_ch_by_cid[channel][cid] = list of (type, blob, task_id, idx)
+        writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
+            ch: {} for ch in channels
+        }
+        # seed_blob_by_ver[(channel, version)] = (type, blob)
+        seed_blob_by_ver: dict[tuple[str, str], tuple[str, bytes]] = {}
+
+        for r in stage2_rows:
+            ch = cast(str, r["channel"])
+            kind = r["_kind"]
+            if kind == "w":
+                cid = cast(str, r["checkpoint_id"])
+                writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
+                    cast(
+                        "tuple[str, bytes, str, int]",
+                        (r["type"], r["blob"], r["task_id"], r["idx"]),
+                    )
+                )
+            else:  # kind == "b"
+                ver = cast(str, r["version"])
+                seed_blob_by_ver[(ch, ver)] = cast(
+                    "tuple[str, bytes]", (r["type"], r["blob"])
+                )
+
+        # Sort writes per (channel, cid) newest-first by (task_id, idx)
+        for cid_map in writes_by_ch_by_cid.values():
+            for ws in cid_map.values():
+                ws.sort(key=lambda w: (w[2], w[3]), reverse=True)
+
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            chain_cids = chain_by_ch.get(ch, [])
+            seed_version = seed_ver_by_ch.get(ch)
+
+            collected: list[PendingWrite] = []
+            cid_writes = writes_by_ch_by_cid.get(ch, {})
+            for cid in chain_cids:
+                for type_tag, write_blob, task_id, _idx in cid_writes.get(cid, []):
+                    val = self.serde.loads_typed((type_tag, write_blob))
+                    collected.append((task_id, ch, val))
+            collected.reverse()
+
+            entry: DeltaChannelHistory = {"writes": collected}
+            if seed_version is not None:
+                blob = seed_blob_by_ver.get((ch, seed_version))
+                if blob is not None and blob[0] != "empty":
+                    entry["seed"] = self.serde.loads_typed(blob)
+            result[ch] = entry
+        return result
+
     def _dump_blobs(
         self,
         thread_id: str,

libs/checkpoint-postgres/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.0.5"
+version = "3.1.0"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=2.1.2,<5.0.0",
+  "langgraph-checkpoint>=4.1.0,<5.0.0",
   "orjson>=3.11.5",
   "psycopg>=3.2.0",
   "psycopg-pool>=3.2.0",
@@ -20,7 +20,7 @@ dependencies = [
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-postgres"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 

libs/checkpoint-postgres/tests/test_async.py

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

libs/checkpoint-postgres/uv.lock

@@ -1,6 +1,10 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
+resolution-markers = [
+    "python_full_version >= '3.15'",
+    "python_full_version < '3.15'",
+]
 
 [[package]]
 name = "annotated-types"
@@ -201,11 +205,11 @@ wheels = [
 
 [[package]]
 name = "idna"
-version = "3.11"
+version = "3.15"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/6f/6d/0703ccc57f3a7233505399edb88de3cbd678da106337b9fcde432b65ed60/idna-3.11.tar.gz", hash = "sha256:795dafcc9c04ed0c1fb032c2aa73654d8e8c5023a7df64a53f39190ada629902", size = 194582, upload-time = "2025-10-12T14:55:20.501Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/82/77/7b3966d0b9d1d31a36ddf1746926a11dface89a83409bf1483f0237aa758/idna-3.15.tar.gz", hash = "sha256:ca962446ea538f7092a95e057da437618e886f4d349216d2b1e294abfdb65fdc", size = 199245, upload-time = "2026-05-12T22:45:57.011Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/0e/61/66938bbb5fc52dbdf84594873d5b51fb1f7c7794e9c0f5bd885f30bc507b/idna-3.11-py3-none-any.whl", hash = "sha256:771a87f49d9defaf64091e6e6fe9c18d4833f140bd19464795bc32d966ca37ea", size = 71008, upload-time = "2025-10-12T14:55:18.883Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/23/408243171aa9aaba178d3e2559159c24c1171a641aa83b67bdd3394ead8e/idna-3.15-py3-none-any.whl", hash = "sha256:048adeaf8c2d788c40fee287673ccaa74c24ffd8dcf09ffa555a2fbb59f10ac8", size = 72340, upload-time = "2026-05-12T22:45:55.733Z" },
 ]
 
 [[package]]
@@ -240,10 +244,11 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.28"
+version = "1.3.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -252,14 +257,26 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d3/ae/8b74458fc3850ec3d150eb9f45e857db129dafa801fb5cf173dfc9f8bbf3/langchain_core-1.3.3.tar.gz", hash = "sha256:fa510a5db8efdc0c6ff41c0939fb5c00a0183c11f6b84233e892e3227ff69182", size = 915041, upload-time = "2026-05-05T19:02:36.612Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
+    { url = "https://files.pythonhosted.org/packages/1f/01/4771b7ab2af1d1aba5b710bd8f13d9225c609425214b357590a17b01be77/langchain_core-1.3.3-py3-none-any.whl", hash = "sha256:18aae8506f37da7f74398492279a7d6efcee4f8e23c4c41c7af080eeb7ef7bd1", size = 543857, upload-time = "2026-05-05T19:02:34.52Z" },
+]
+
+[[package]]
+name = "langchain-protocol"
+version = "0.0.15"
+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" }
+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" },
 ]
 
 [[package]]
 name = "langgraph-checkpoint"
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+]
+
 [[package]]
 name = "zstandard"
 version = "0.25.0"

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

@@ -4,7 +4,7 @@ import json
 import random
 import sqlite3
 import threading
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import closing, contextmanager
 from typing import Any, cast
 
@@ -16,12 +16,19 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
 
+from langgraph.checkpoint.sqlite._delta import (
+    DELTA_STAGE1_SQL,
+    build_delta_channels_writes_history,
+    build_delta_stage2_sql,
+    step_walk_with_row,
+)
 from langgraph.checkpoint.sqlite.utils import search_where
 
 _AIO_ERROR_MSG = (
@@ -493,6 +500,88 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                 (str(thread_id),),
             )
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
+
+        Two-stage query:
+
+        * Stage 1 (paged): newest-first slice of `checkpoints` returning
+          `(checkpoint_id, parent_checkpoint_id, type, checkpoint)` per
+          ancestor. Sqlite has no JSONB, so we ship the full serialized
+          checkpoint blob and inspect `channel_values` in Python. Pages
+          newest-first by `checkpoint_id` with a `< cursor` predicate;
+          page size is `DELTA_PAGE_SIZE`. Stops paging when every channel
+          has found its seed or the chain is exhausted.
+
+        * Stage 2 (per-channel UNION ALL): one branch per channel reading
+          `writes` filtered to that channel's specific `chain_cids`. No
+          separate seed-blob fetch — sqlite stores `channel_values` inline
+          in the checkpoint blob, so seeds come back from stage 1.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = self.get_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_val_by_ch: dict[str, Any] = {}
+        walk_state: dict[str, Any] = {}
+        seeded: set[str] = set()
+
+        with self.cursor(transaction=False) as cur:
+            cur.execute(DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id))
+            for row in cur:
+                cid, parent_cid, type_tag, blob = row
+                if step_walk_with_row(
+                    cid=cid,
+                    parent_cid=parent_cid,
+                    type_tag=type_tag,
+                    blob=blob,
+                    target_id=checkpoint_id,
+                    serde=self.serde,
+                    chain_by_ch=chain_by_ch,
+                    seed_val_by_ch=seed_val_by_ch,
+                    walk_state=walk_state,
+                    seeded=seeded,
+                    channels=channels,
+                ):
+                    break
+
+            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+            stage2_sql = build_delta_stage2_sql(
+                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
+            )
+            if stage2_sql:
+                stage2_params: list[Any] = []
+                for ch in channels_with_chain:
+                    stage2_params.extend(
+                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
+                    )
+                cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cast(
+                    "list[tuple[str, str, str, int, str, bytes]]", cur.fetchall()
+                )
+            else:
+                stage2_rows = []
+
+        return build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_val_by_ch=seed_val_by_ch,
+            seeded=seeded,
+            stage2_rows=stage2_rows,
+            serde=self.serde,
+        )
+
     async def aget_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the database asynchronously.
 

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

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

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

@@ -4,7 +4,7 @@ import asyncio
 import json
 import random
 import threading
-from collections.abc import AsyncIterator, Callable, Iterator, Sequence
+from collections.abc import AsyncIterator, Callable, Iterator, Mapping, Sequence
 from contextlib import asynccontextmanager
 from typing import Any, TypeVar, cast
 
@@ -17,12 +17,19 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
 
+from langgraph.checkpoint.sqlite._delta import (
+    DELTA_STAGE1_SQL,
+    build_delta_channels_writes_history,
+    build_delta_stage2_sql,
+    step_walk_with_row,
+)
 from langgraph.checkpoint.sqlite.utils import search_where
 
 T = TypeVar("T", bound=Callable)
@@ -272,6 +279,29 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
             self.adelete_thread(thread_id), self.loop
         ).result()
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Sync bridge to `aget_delta_channel_history`.
+
+        Mirrors the same cross-thread guard as `get_tuple` /
+        `delete_thread` — calling from the loop thread raises rather than
+        deadlocking.
+        """
+        try:
+            if asyncio.get_running_loop() is self.loop:
+                raise asyncio.InvalidStateError(
+                    "Synchronous calls to AsyncSqliteSaver are only allowed from a "
+                    "different thread. From the main thread, use the async interface. "
+                    "For example, use `await checkpointer.aget_delta_channel_history(...)`."
+                )
+        except RuntimeError:
+            pass
+        return asyncio.run_coroutine_threadsafe(
+            self.aget_delta_channel_history(config=config, channels=channels),
+            self.loop,
+        ).result()
+
     async def setup(self) -> None:
         """Set up the checkpoint database asynchronously.
 
@@ -589,6 +619,83 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
             )
             await self.conn.commit()
 
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
+
+        See `SqliteSaver.get_delta_channel_history` for design notes; this
+        is the async equivalent using `aiosqlite` cursors. Stage 1 pages
+        the parent chain newest-first and Python-deserializes each
+        checkpoint blob to find per-channel snapshots; stage 2 fetches
+        only the relevant writes via per-channel UNION ALL.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        await self.setup()
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = await self.aget_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_val_by_ch: dict[str, Any] = {}
+        walk_state: dict[str, Any] = {}
+        seeded: set[str] = set()
+
+        async with self.lock, self.conn.cursor() as cur:
+            await cur.execute(
+                DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id)
+            )
+            async for row in cur:
+                cid, parent_cid, type_tag, blob = row
+                if step_walk_with_row(
+                    cid=cid,
+                    parent_cid=parent_cid,
+                    type_tag=type_tag,
+                    blob=blob,
+                    target_id=checkpoint_id,
+                    serde=self.serde,
+                    chain_by_ch=chain_by_ch,
+                    seed_val_by_ch=seed_val_by_ch,
+                    walk_state=walk_state,
+                    seeded=seeded,
+                    channels=channels,
+                ):
+                    break
+
+            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+            stage2_sql = build_delta_stage2_sql(
+                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
+            )
+            if stage2_sql:
+                stage2_params: list[Any] = []
+                for ch in channels_with_chain:
+                    stage2_params.extend(
+                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
+                    )
+                await cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cast(
+                    "list[tuple[str, str, str, int, str, bytes]]",
+                    await cur.fetchall(),
+                )
+            else:
+                stage2_rows = []
+
+        return build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_val_by_ch=seed_val_by_ch,
+            seeded=seeded,
+            stage2_rows=stage2_rows,
+            serde=self.serde,
+        )
+
     def get_next_version(self, current: str | None, channel: None) -> str:
         """Generate the next version ID for a channel.
 

libs/checkpoint-sqlite/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-sqlite"
-version = "3.0.3"
+version = "3.1.0"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,14 +12,14 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=3,<5.0.0",
+    "langgraph-checkpoint>=4.1.0,<5.0.0",
     "aiosqlite>=0.20",
     "sqlite-vec>=0.1.6",
 ]
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-sqlite"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 

libs/checkpoint-sqlite/tests/test_conformance_delta.py

@@ -0,0 +1,35 @@
+"""Run delta-channel conformance capabilities against AsyncSqliteSaver."""
+
+from __future__ import annotations
+
+import pytest
+
+pytest.importorskip(
+    "langgraph.checkpoint.conformance",
+    reason="langgraph-checkpoint-conformance not installed",
+)
+pytest.importorskip("aiosqlite", reason="aiosqlite not installed")
+
+
+@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:
+            yield saver
+
+    report = await validate(
+        sqlite_saver,
+        capabilities={
+            "delta_channel_history",
+        },
+    )
+    for cap, result in report.results.items():
+        if result.passed is False:
+            details = "\n".join(result.failures or [])
+            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint-sqlite/tests/test_delta_channel_migration.py

@@ -0,0 +1,170 @@
+"""Sqlite-specific migration smoke tests: BinaryOperatorAggregate -> DeltaChannel.
+
+Mirrors `libs/langgraph/tests/test_delta_channel_migration.py` (which
+covers `InMemorySaver` + a third-party fallback to the base default
+impl). This file exercises the same migration scenario through the
+sqlite-specific `SqliteSaver.get_delta_channel_history` override —
+specifically that the streaming ancestor walk finds a pre-migration
+plain `channel_values[ch]` entry and surfaces it as the `seed`, with
+post-migration writes folding on top through the reducer.
+
+Pre-migration checkpoints under `BinaryOperatorAggregate` carry the
+full accumulated value at every settled super-step boundary. The
+override has to identify those as "real" seeds (not `_DeltaSnapshot`
+sentinels) — the saver layer is intentionally delta-agnostic and just
+returns whatever is stored in `channel_values[ch]`.
+"""
+
+from __future__ import annotations
+
+import operator
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+
+# `langgraph` core isn't a dep of `langgraph-checkpoint-sqlite`. Skip the
+# whole module rather than importerror-ing in the standalone CI shape.
+pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
+pytest.importorskip("langgraph.channels.binop", reason="langgraph core not installed")
+pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
+
+from langgraph.channels.binop import BinaryOperatorAggregate  # type: ignore[import-untyped]  # noqa: 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.checkpoint.sqlite import SqliteSaver  # noqa: E402
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver  # noqa: E402
+
+pytestmark = pytest.mark.anyio
+
+
+def _noop(_state: Any) -> dict:
+    return {}
+
+
+def _list_concat(state: list, writes: list) -> list:
+    result = list(state)
+    for w in writes:
+        result.extend(w if isinstance(w, list) else [w])
+    return result
+
+
+def _binop_graph(checkpointer: Any) -> Any:
+    class BinopState(TypedDict):
+        items: Annotated[list, BinaryOperatorAggregate(list, operator.add)]
+
+    return (
+        StateGraph(BinopState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _delta_graph(checkpointer: Any) -> Any:
+    class DeltaState(TypedDict):
+        items: Annotated[list, DeltaChannel(_list_concat)]
+
+    return (
+        StateGraph(DeltaState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _drive(graph: Any, config: RunnableConfig, tag: str, n: int) -> None:
+    for i in range(n):
+        graph.invoke({"items": [f"{tag}{i}"]}, config)
+
+
+async def _adrive(graph: Any, config: RunnableConfig, tag: str, n: int) -> None:
+    for i in range(n):
+        await graph.ainvoke({"items": [f"{tag}{i}"]}, config)
+
+
+def _settled_boundaries(history: list) -> list[tuple[RunnableConfig, list]]:
+    """`(config, items)` for every checkpoint with `next == ('__start__',)`
+    — the stable inter-invoke boundaries that round-trip predictably.
+    """
+    return [
+        (s.config, list(s.values.get("items", [])))
+        for s in history
+        if s.next == ("__start__",)
+    ]
+
+
+def test_migration_preserves_pre_migration_state_sync() -> None:
+    """Drive 3 invokes under `BinaryOperatorAggregate`, swap the
+    annotation to `DeltaChannel` on the same sqlite-backed thread, and
+    verify every settled pre-migration boundary round-trips exactly.
+
+    The override's streaming walk must identify the plain accumulated
+    list at each pre-migration ancestor as a valid `seed` even though
+    no `_DeltaSnapshot` was ever written there.
+    """
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-sync"}}
+
+        binop = _binop_graph(saver)
+        _drive(binop, config, "u", 3)
+
+        pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
+        assert len(pre_boundaries) >= 2, "expected multiple settled boundaries"
+
+        delta = _delta_graph(saver)
+        for cfg, items in pre_boundaries:
+            snap = delta.get_state(cfg)
+            assert list(snap.values.get("items", [])) == items, (
+                f"snapshot mismatch at {cfg['configurable']['checkpoint_id']}: "
+                f"expected {items}, got {snap.values.get('items', [])}"
+            )
+
+
+def test_migration_continued_thread_folds_deltas_on_seed_sync() -> None:
+    """After migration, driving one more super-step extends the
+    pre-migration accumulated state via the delta reducer — the seed
+    plus a single new write.
+    """
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-continue-sync"}}
+
+        binop = _binop_graph(saver)
+        _drive(binop, config, "u", 3)
+
+        pre_history = list(binop.get_state_history(config))
+        pre_boundaries = _settled_boundaries(pre_history)
+        # Latest settled boundary — the leaf pre-migration state.
+        leaf_cfg, leaf_items = pre_boundaries[0]
+        assert leaf_items, "expected non-empty pre-migration leaf"
+
+        delta = _delta_graph(saver)
+        delta.invoke({"items": ["after-migration"]}, leaf_cfg)
+        new_state = delta.get_state(config).values["items"]
+        assert new_state[: len(leaf_items)] == leaf_items
+        assert "after-migration" in new_state
+
+
+async def test_migration_preserves_pre_migration_state_async() -> None:
+    """Async equivalent of the basic-migration round-trip check on
+    `AsyncSqliteSaver`."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-async"}}
+
+        binop = _binop_graph(saver)
+        await _adrive(binop, config, "u", 3)
+
+        pre_history = [s async for s in binop.aget_state_history(config)]
+        pre_boundaries = _settled_boundaries(pre_history)
+        assert len(pre_boundaries) >= 2
+
+        delta = _delta_graph(saver)
+        for cfg, items in pre_boundaries:
+            snap = await delta.aget_state(cfg)
+            assert list(snap.values.get("items", [])) == items, (
+                f"async snapshot mismatch at {cfg['configurable']['checkpoint_id']}"
+            )

libs/checkpoint-sqlite/tests/test_get_delta_channel_history.py

@@ -0,0 +1,271 @@
+"""Smoke tests for `BaseCheckpointSaver.get_delta_channel_history` on sqlite.
+
+`SqliteSaver` (and `AsyncSqliteSaver`) deliberately don't override the
+default implementation in `BaseCheckpointSaver` — these tests pin the
+default impl to behave correctly end-to-end against a real persistent
+saver and a real `DeltaChannel`-backed graph.
+
+Scenarios covered:
+
+* Empty `channels` argument returns an empty mapping (no I/O).
+* On a non-trivial multi-checkpoint thread, per-channel writes come back
+  oldest→newest.
+* When the walk reaches the root without ever finding a stored value,
+  `seed` is omitted from the entry (consumer treats absence as "start
+  empty").
+* When a `_DeltaSnapshot` blob is present at an ancestor, it is returned
+  as the `seed`.
+* The async saver returns the same shape via `aget_delta_channel_history`.
+"""
+
+from __future__ import annotations
+
+import operator
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+
+# `langgraph` is not a dep of `langgraph-checkpoint-sqlite`. When tests run
+# in the sqlite lib's standalone CI environment without it installed, skip
+# the whole module rather than failing at import.
+pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
+pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
+
+from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: 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.checkpoint.sqlite import SqliteSaver  # noqa: E402
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver  # noqa: E402
+
+pytestmark = pytest.mark.anyio
+
+
+# ---------------------------------------------------------------------------
+# Graph helpers
+# ---------------------------------------------------------------------------
+
+
+def _noop(_state: Any) -> dict[str, Any]:
+    return {}
+
+
+class _DeltaState(TypedDict):
+    items: Annotated[list, DeltaChannel(operator.add)]
+
+
+def _delta_graph(checkpointer: Any) -> Any:
+    return (
+        StateGraph(_DeltaState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _drive(graph: Any, config: RunnableConfig, n: int) -> None:
+    for i in range(n):
+        graph.invoke({"items": [f"v{i}"]}, config)
+
+
+async def _adrive(graph: Any, config: RunnableConfig, n: int) -> None:
+    for i in range(n):
+        await graph.ainvoke({"items": [f"v{i}"]}, config)
+
+
+def _pick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
+    """Return a config pointing at a checkpoint that has at least one ancestor.
+
+    `get_delta_channel_history` walks the parent chain — calling it on the root
+    checkpoint produces `writes=[]` and no `seed`, which is uninteresting
+    for the multi-step assertions below.
+    """
+    history = list(saver.list(config))
+    assert history, "expected non-empty history"
+    # `list` yields newest→oldest; the second entry has the first entry
+    # as its parent, so its parent_config is non-None.
+    for tup in history:
+        if tup.parent_config is not None:
+            return tup.config
+    raise AssertionError("no checkpoint with a parent in history")
+
+
+async def _apick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
+    history = [tup async for tup in saver.alist(config)]
+    assert history, "expected non-empty history"
+    for tup in history:
+        if tup.parent_config is not None:
+            return tup.config
+    raise AssertionError("no checkpoint with a parent in history")
+
+
+# ---------------------------------------------------------------------------
+# Sync: SqliteSaver
+# ---------------------------------------------------------------------------
+
+
+def test_empty_channels_returns_empty_mapping_sync() -> None:
+    """Empty `channels` short-circuits to `{}` without touching storage."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "empty"}}
+        assert saver.get_delta_channel_history(config=config, channels=[]) == {}
+
+
+def test_writes_history_oldest_to_newest_sync() -> None:
+    """Per-channel writes accumulated across the walk come back oldest→newest."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "history-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 3)
+
+        target_cfg = _pick_non_root(saver, config)
+        result = saver.get_delta_channel_history(config=target_cfg, channels=["items"])
+
+        assert "items" in result
+        entry = result["items"]
+        assert isinstance(entry["writes"], list)
+
+        # If any writes were collected, their values should be in oldest→newest
+        # order — i.e. tagged 'v0', 'v1', ... matching invoke order.
+        write_values: list[Any] = []
+        for _task_id, channel, value in entry["writes"]:
+            assert channel == "items"
+            write_values.extend(value if isinstance(value, list) else [value])
+
+        # `_drive` invokes with payloads ['v0'], ['v1'], ['v2']. Whatever
+        # subset shows up in the chain must be a contiguous prefix in order.
+        for idx, val in enumerate(write_values):
+            assert val == f"v{idx}", (
+                f"writes not in oldest→newest order: {write_values}"
+            )
+
+
+def test_seed_present_when_snapshot_in_ancestor_sync() -> None:
+    """Inserting a `_DeltaSnapshot` blob at an ancestor → walk returns it as `seed`."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "seed-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 2)
+
+        # Find the oldest non-root checkpoint, then walk to its parent and
+        # rewrite that parent's `channel_values["items"]` to a real
+        # `_DeltaSnapshot`. After this surgery, calling `get_delta_channel_history`
+        # at the leaf must return the snapshot value as `seed`.
+        history = list(saver.list(config))
+        assert len(history) >= 2
+        leaf_tup = history[0]
+        # Walk to an ancestor with a parent_config (any non-root will do).
+        ancestor_tup = next(
+            (tup for tup in history if tup.parent_config is not None), None
+        )
+        assert ancestor_tup is not None
+        parent_cfg = ancestor_tup.parent_config
+        assert parent_cfg is not None
+        parent_tup = saver.get_tuple(parent_cfg)
+        assert parent_tup is not None
+
+        snapshot_value = ["seeded", "items"]
+        parent_tup.checkpoint["channel_values"]["items"] = _DeltaSnapshot(
+            snapshot_value
+        )
+        # Make sure the channel has a version so the optimized blob lookup
+        # in any future override has something to hit.
+        parent_tup.checkpoint["channel_versions"].setdefault("items", 1)
+        saver.put(
+            parent_tup.parent_config or {"configurable": parent_cfg["configurable"]},
+            parent_tup.checkpoint,
+            parent_tup.metadata,
+            {},
+        )
+
+        result = saver.get_delta_channel_history(
+            config=leaf_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" in entry, f"expected seed to be present, got {entry}"
+        seed = entry["seed"]
+        assert isinstance(seed, _DeltaSnapshot), (
+            f"expected _DeltaSnapshot, got {seed!r}"
+        )
+        assert seed.value == snapshot_value
+
+
+def test_seed_omitted_when_walk_reaches_root_sync() -> None:
+    """`get_delta_channel_history` on the root checkpoint → no `seed` key, no writes."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "root-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 1)
+
+        history = list(saver.list(config))
+        # Root is the oldest checkpoint (no parent_config).
+        root_tup = history[-1]
+        assert root_tup.parent_config is None
+
+        result = saver.get_delta_channel_history(
+            config=root_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
+        assert entry["writes"] == []
+
+
+# ---------------------------------------------------------------------------
+# Async: AsyncSqliteSaver
+# ---------------------------------------------------------------------------
+
+
+async def test_empty_channels_returns_empty_mapping_async() -> None:
+    """Async equivalent of the empty-channels short-circuit."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "empty-async"}}
+        assert await saver.aget_delta_channel_history(config=config, channels=[]) == {}
+
+
+async def test_writes_history_oldest_to_newest_async() -> None:
+    """Async equivalent of the oldest→newest ordering check."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "history-async"}}
+        graph = _delta_graph(saver)
+        await _adrive(graph, config, 3)
+
+        target_cfg = await _apick_non_root(saver, config)
+        result = await saver.aget_delta_channel_history(
+            config=target_cfg, channels=["items"]
+        )
+
+        assert "items" in result
+        entry = result["items"]
+        assert isinstance(entry["writes"], list)
+
+        write_values: list[Any] = []
+        for _task_id, channel, value in entry["writes"]:
+            assert channel == "items"
+            write_values.extend(value if isinstance(value, list) else [value])
+
+        for idx, val in enumerate(write_values):
+            assert val == f"v{idx}", (
+                f"writes not in oldest→newest order: {write_values}"
+            )
+
+
+async def test_seed_omitted_when_walk_reaches_root_async() -> None:
+    """Async equivalent of the root-walk seed-absence check."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "root-async"}}
+        graph = _delta_graph(saver)
+        await _adrive(graph, config, 1)
+
+        history = [tup async for tup in saver.alist(config)]
+        root_tup = history[-1]
+        assert root_tup.parent_config is None
+
+        result = await saver.aget_delta_channel_history(
+            config=root_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
+        assert entry["writes"] == []

libs/checkpoint-sqlite/uv.lock

@@ -1,6 +1,10 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
+resolution-markers = [
+    "python_full_version >= '3.15'",
+    "python_full_version < '3.15'",
+]
 
 [[package]]
 name = "aiosqlite"
@@ -210,11 +214,11 @@ wheels = [
 
 [[package]]
 name = "idna"
-version = "3.11"
+version = "3.15"
 source = { registry = "https://pypi.org/simple" }
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+
 [[package]]
 name = "zstandard"
 version = "0.25.0"

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

@@ -3,7 +3,7 @@ from __future__ import annotations
 import copy
 import logging
 from collections.abc import AsyncIterator, Collection, Iterator, Mapping, Sequence
-from typing import (  # noqa: UP035
+from typing import (
     Any,
     Generic,
     Literal,
@@ -13,6 +13,7 @@ from typing import (  # noqa: UP035
 )
 
 from langchain_core.runnables import RunnableConfig
+from typing_extensions import NotRequired
 
 from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_methods
@@ -28,6 +29,8 @@ from langgraph.checkpoint.serde.types import (
 
 V = TypeVar("V", int, float, str)
 PendingWrite = tuple[str, str, Any]
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -57,6 +60,30 @@ class CheckpointMetadata(TypedDict, total=False):
     """
     run_id: str
     """The ID of the run that created this checkpoint."""
+    counters_since_delta_snapshot: dict[str, tuple[int, int]]
+    """Per-channel counters since the last `_DeltaSnapshot` was written.
+
+    !!! warning "Beta"
+
+        This metadata field backs `DeltaChannel` (beta). The key name and
+        contents may change while the delta-channel design stabilizes.
+
+    Maps channel name -> `(updates, supersteps)`:
+
+    - index 0 (`updates`): number of supersteps that wrote to this channel
+      since its last snapshot blob.
+    - index 1 (`supersteps`): total supersteps elapsed since this channel's
+      last snapshot, regardless of whether the channel was written.
+
+    A snapshot fires when EITHER `updates >= ch.snapshot_frequency` OR
+    `supersteps >= DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT` (system-wide bound,
+    default 5000, env `LANGGRAPH_DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`).
+    The supersteps bound prevents unbounded ancestor walks on threads where
+    a delta channel exists but is no longer being updated.
+
+    Absent on threads that don't use delta channels. Persisted as a
+    2-element list in JSON (no native tuple).
+    """
 
 
 ChannelVersions = dict[str, str | int | float]
@@ -119,6 +146,33 @@ class CheckpointTuple(NamedTuple):
     pending_writes: list[PendingWrite] | None = None
 
 
+class DeltaChannelHistory(TypedDict):
+    """Per-channel result entry from `BaseCheckpointSaver.get_delta_channel_history`.
+
+    !!! warning "Beta"
+
+        Part of the `DeltaChannel` support surface; in beta. Field names and
+        semantics may change.
+
+    Storage-level view of what one channel contributed across the ancestor
+    chain of a target checkpoint:
+
+    * `writes` — on-path deltas oldest→newest as `PendingWrite` tuples.
+      Always present; possibly empty. Already filtered to one channel.
+      Writes stored at the target checkpoint itself are pending for the
+      next super-step and are excluded.
+    * `seed` — the stored value at the nearest ancestor whose
+      `channel_values[ch]` is populated. Omitted if the walk reached the
+      root without finding any stored value (consumer treats absence as
+      "start empty"). Typically a `_DeltaSnapshot` for delta channels with
+      finite snapshot frequency, or a plain value for threads migrated
+      from a pre-delta channel type.
+    """
+
+    writes: list[PendingWrite]
+    seed: NotRequired[Any]
+
+
 class BaseCheckpointSaver(Generic[V]):
     """Base class for creating a graph checkpointer.
 
@@ -282,6 +336,14 @@ class BaseCheckpointSaver(Generic[V]):
 
         Args:
             run_ids: The run IDs whose checkpoints should be deleted.
+
+        !!! warning "DeltaChannel"
+
+            Deleting a run that produced ancestor `checkpoint_writes` — or
+            the only `_DeltaSnapshot` blob — for a still-live thread will
+            break reconstruction of any `DeltaChannel` whose history
+            depended on those rows. See the `DeltaChannel` note on `prune`
+            for safe-recovery strategies.
         """
         raise NotImplementedError
 
@@ -295,6 +357,17 @@ class BaseCheckpointSaver(Generic[V]):
         Args:
             source_thread_id: The thread ID to copy from.
             target_thread_id: The thread ID to copy to.
+
+        !!! warning "DeltaChannel"
+
+            Implementations must copy the **complete** parent chain (all
+            ancestor checkpoints and their `checkpoint_writes`) — copying
+            only the head checkpoint will leave the target thread with
+            `DeltaChannel` state that cannot be reconstructed (no path back
+            to a `_DeltaSnapshot` ancestor). Equivalently, the copy must
+            include enough ancestors that every `DeltaChannel`-backed key
+            has either a `_DeltaSnapshot` in `channel_values` somewhere in
+            the chain, or a complete write history back to the chain root.
         """
         raise NotImplementedError
 
@@ -310,6 +383,34 @@ class BaseCheckpointSaver(Generic[V]):
             thread_ids: The thread IDs to prune.
             strategy: The pruning strategy. `"keep_latest"` retains only the most
                 recent checkpoint per namespace. `"delete"` removes all checkpoints.
+
+        !!! warning "DeltaChannel"
+
+            Custom implementations must be `DeltaChannel`-aware. `DeltaChannel`
+            stores only a sentinel in `channel_values` for non-snapshot steps;
+            reconstruction walks the parent chain via
+            `get_delta_channel_history`, accumulating rows from
+            `checkpoint_writes` until it reaches an ancestor whose
+            `channel_values` contains a `_DeltaSnapshot` blob (written every
+            `snapshot_frequency` updates).
+
+            A naive `"keep_latest"` that drops intermediate checkpoints and
+            their writes can sever that chain: the surviving "latest"
+            checkpoint is rarely a snapshot point itself, so its delta
+            channels would silently reconstruct as empty (no error raised —
+            `get_delta_channel_history` simply returns no `seed`). Safe
+            options when the graph uses `DeltaChannel`:
+
+            * Walk back from each kept checkpoint and preserve every
+              ancestor (plus its `checkpoint_writes`) up to the nearest one
+              whose `channel_values` already contains a `_DeltaSnapshot` for
+              every `DeltaChannel`-backed key.
+            * Force a fresh snapshot on the kept checkpoint before deleting
+              ancestors — rewrite `channel_values[k] = _DeltaSnapshot(value)`
+              for each delta channel `k` (resolving `value` via the existing
+              ancestor walk first), then prune.
+            * Skip pruning threads whose graph uses `DeltaChannel` until one
+              of the above is implemented.
         """
         raise NotImplementedError
 
@@ -426,6 +527,13 @@ class BaseCheckpointSaver(Generic[V]):
 
         Args:
             run_ids: The run IDs whose checkpoints should be deleted.
+
+        !!! warning "DeltaChannel"
+
+            See `delete_for_runs` — deleting rows a still-live thread's
+            `DeltaChannel` reconstruction depends on (writes between the
+            head and its nearest `_DeltaSnapshot` ancestor) will silently
+            corrupt that channel's state.
         """
         raise NotImplementedError
 
@@ -439,6 +547,13 @@ class BaseCheckpointSaver(Generic[V]):
         Args:
             source_thread_id: The thread ID to copy from.
             target_thread_id: The thread ID to copy to.
+
+        !!! warning "DeltaChannel"
+
+            See `copy_thread` — the copy must carry the complete parent
+            chain (or at least back to a `_DeltaSnapshot` ancestor for every
+            `DeltaChannel`) so the target thread can reconstruct delta
+            state.
         """
         raise NotImplementedError
 
@@ -454,9 +569,126 @@ class BaseCheckpointSaver(Generic[V]):
             thread_ids: The thread IDs to prune.
             strategy: The pruning strategy. `"keep_latest"` retains only the most
                 recent checkpoint per namespace. `"delete"` removes all checkpoints.
+
+        !!! warning "DeltaChannel"
+
+            See `prune` for the full `DeltaChannel` caveat. In short:
+            `"keep_latest"` must not drop ancestor checkpoints / writes that
+            sit between the kept checkpoint and the nearest `_DeltaSnapshot`
+            ancestor, or delta channels will silently reconstruct as empty.
         """
         raise NotImplementedError
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Walk the parent chain returning per-channel writes + seed.
+
+        !!! warning "Beta"
+
+            This method is part of the `DeltaChannel` support surface and is
+            in beta. The signature, return shape (`DeltaChannelHistory`), and
+            interaction with `_DeltaSnapshot` blobs may change. Override at
+            your own risk; the default implementation will continue to work
+            against the public `BaseCheckpointSaver` contract.
+
+        For each requested channel, walks ancestors of the checkpoint
+        identified by `config` (following `parent_config`) and accumulates
+        `pending_writes` for that channel. The walk terminates per-channel
+        at the nearest ancestor whose `channel_values[ch]` is populated;
+        that value is returned as `seed`. If the walk reaches the root
+        without finding a stored value, `seed` is omitted from that
+        channel's entry — the consumer treats the absence as "start
+        empty."
+
+        Walks the **parent chain** (not `list(before=...)`): for forked
+        threads, only on-path ancestors contribute.
+
+        The default implementation walks `get_tuple` + `parent_config`
+        once for all channels — each ancestor visited once, not once per
+        channel. Savers with direct storage access (`InMemorySaver`,
+        `PostgresSaver`) override for performance; the return contract is
+        fixed here.
+
+        Args:
+            config: Configuration identifying the target checkpoint.
+            channels: Channel names to walk for. Empty → empty mapping.
+
+        Returns:
+            Per-channel `DeltaChannelHistory` for every name in `channels`.
+        """
+        if not channels:
+            return {}
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+        target_tuple = self.get_tuple(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None and remaining:
+            tup = self.get_tuple(cursor_config)
+            if tup is None:
+                break
+            if tup.pending_writes:
+                for write in reversed(tup.pending_writes):
+                    ch = write[1]
+                    if ch in remaining:
+                        collected_by_ch[ch].append(write)
+            for ch in list(remaining):
+                if ch in tup.checkpoint["channel_values"]:
+                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
+                    remaining.discard(ch)
+            cursor_config = tup.parent_config
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
+            if ch in seed_by_ch:
+                entry["seed"] = seed_by_ch[ch]
+            result[ch] = entry
+        return result
+
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Async version of `get_delta_channel_history`.
+
+        !!! warning "Beta"
+
+            This method is part of the `DeltaChannel` support surface and is
+            in beta. See `get_delta_channel_history` for caveats.
+        """
+        if not channels:
+            return {}
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+        target_tuple = await self.aget_tuple(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None and remaining:
+            tup = await self.aget_tuple(cursor_config)
+            if tup is None:
+                break
+            if tup.pending_writes:
+                for write in reversed(tup.pending_writes):
+                    ch = write[1]
+                    if ch in remaining:
+                        collected_by_ch[ch].append(write)
+            for ch in list(remaining):
+                if ch in tup.checkpoint["channel_values"]:
+                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
+                    remaining.discard(ch)
+            cursor_config = tup.parent_config
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
+            if ch in seed_by_ch:
+                entry["seed"] = seed_by_ch[ch]
+            result[ch] = entry
+        return result
+
     def get_next_version(self, current: V | None, channel: None) -> V:
         """Generate the next version ID for a channel.
 

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

@@ -6,7 +6,7 @@ import pickle
 import random
 import shutil
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import AbstractAsyncContextManager, AbstractContextManager, ExitStack
 from types import TracebackType
 from typing import Any
@@ -20,6 +20,8 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
+    PendingWrite,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
@@ -121,16 +123,115 @@ class InMemorySaver(
         return self.stack.__exit__(__exc_type, __exc_value, __traceback)
 
     def _load_blobs(
-        self, thread_id: str, checkpoint_ns: str, versions: ChannelVersions
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        versions: ChannelVersions,
     ) -> dict[str, Any]:
-        channel_values: dict[str, Any] = {}
-        for k, v in versions.items():
-            kk = (thread_id, checkpoint_ns, k, v)
-            if kk in self.blobs:
-                vv = self.blobs[kk]
-                if vv[0] != "empty":
-                    channel_values[k] = self.serde.loads_typed(vv)
-        return channel_values
+        result: dict[str, Any] = {}
+        for k, ver in versions.items():
+            kk = (thread_id, checkpoint_ns, k, ver)
+            if kk not in self.blobs:
+                continue
+            vv = self.blobs[kk]
+            if vv[0] == "empty":
+                continue
+            result[k] = self.serde.loads_typed(vv)
+        return result
+
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Override: walk the parent chain ONCE for all requested channels.
+
+        Each channel terminates independently at the nearest ancestor
+        whose stored blob is non-empty. Other channels keep walking until
+        they find their own terminator or hit the root.
+
+        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).
+        """
+        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", "")
+        ns_storage = self.storage.get(thread_id, {}).get(checkpoint_ns, {})
+
+        chain: list[str] = []
+        target_entry = ns_storage.get(checkpoint_id)
+        current: str | None = target_entry[2] if target_entry is not None else None
+        while current is not None:
+            entry = ns_storage.get(current)
+            if entry is None:
+                break
+            chain.append(current)
+            _, _, parent = entry
+            current = parent
+
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+
+        for cp_id in chain:
+            if not remaining:
+                break
+            entry = ns_storage.get(cp_id)
+            ckpt = self.serde.loads_typed(entry[0]) if entry is not None else None
+
+            terminated_here: set[str] = set()
+            blob_value_by_ch: dict[str, Any] = {}
+            if ckpt is not None:
+                versions = ckpt.get("channel_versions", {})
+                for ch in remaining:
+                    ver = versions.get(ch)
+                    if ver is None:
+                        continue
+                    blob_entry = self.blobs.get((thread_id, checkpoint_ns, ch, ver))
+                    if blob_entry is None or blob_entry[0] == "empty":
+                        continue
+                    blob_value_by_ch[ch] = self.serde.loads_typed(blob_entry)
+                    terminated_here.add(ch)
+
+            step_writes = self.writes.get((thread_id, checkpoint_ns, cp_id), {})
+            for (_task_id, _idx), (tid, ch, serialized, _) in sorted(
+                step_writes.items(), reverse=True
+            ):
+                if ch not in remaining:
+                    continue
+                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))
+                )
+
+            for ch in terminated_here:
+                seed_by_ch[ch] = blob_value_by_ch[ch]
+                remaining.discard(ch)
+
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry_h: DeltaChannelHistory = {
+                "writes": list(reversed(collected_by_ch[ch]))
+            }
+            if ch in seed_by_ch:
+                entry_h["seed"] = seed_by_ch[ch]
+            result[ch] = entry_h
+        return result
+
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        return self.get_delta_channel_history(config=config, channels=channels)
 
     def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the in-memory storage.

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

@@ -73,6 +73,7 @@ SAFE_MSGPACK_TYPES: frozenset[tuple[str, ...]] = frozenset(
         ("langchain_core.documents.base", "Document"),
         # langgraph
         ("langgraph.types", "Send"),
+        ("langgraph.types", "TimeoutPolicy"),
         ("langgraph.types", "Interrupt"),
         ("langgraph.types", "Command"),
         ("langgraph.types", "StateSnapshot"),

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

@@ -33,19 +33,51 @@ from langchain_core.load.load import Reviver
 from langgraph.checkpoint.serde import _msgpack as _lg_msgpack
 from langgraph.checkpoint.serde.base import SerializerProtocol
 from langgraph.checkpoint.serde.event_hooks import emit_serde_event
-from langgraph.checkpoint.serde.types import SendProtocol
+from langgraph.checkpoint.serde.types import (
+    SendProtocol,
+    _DeltaSnapshot,
+)
 from langgraph.store.base import Item
 
 if TYPE_CHECKING:
     from langgraph.checkpoint.serde._msgpack import (
         AllowedMsgpackModules,
     )
-    from langgraph.checkpoint.serde.types import SendProtocol
 
-LC_REVIVER = Reviver()
+LC_REVIVER = Reviver(allowed_objects="core")
 EMPTY_BYTES = b""
 logger = logging.getLogger(__name__)
 
+# Dedup log warnings across process lifetime; cap bounds state if types are
+# dynamically generated (also acts as a circuit breaker on warning volume).
+# Dedup is best-effort: racing threads may each emit once for the same key,
+# and warnings are silently dropped once _MAX_WARNED_TYPES is reached.
+_MAX_WARNED_TYPES = 1000
+_warned_unregistered_types: set[tuple[str, str]] = set()
+_warned_blocked_types: set[tuple[str, str]] = set()
+
+
+def _is_safe_json_type(id_list: list[str]) -> bool:
+    """Return True if an lc=2 id refers to a type in SAFE_MSGPACK_TYPES.
+
+    Safe types bypass the ``allowed_json_modules`` gate so that old "json" format
+    checkpoints (written before the msgpack migration) can be resumed without
+    requiring users to configure an explicit allowlist.
+    """
+    if len(id_list) < 2:
+        return False
+    module_name = ".".join(id_list[:-1])
+    return (module_name, id_list[-1]) in _lg_msgpack.SAFE_MSGPACK_TYPES
+
+
+def _warn_once(
+    seen: set[tuple[str, str]], key: tuple[str, str], msg: str, *args: object
+) -> None:
+    if key in seen or len(seen) >= _MAX_WARNED_TYPES:
+        return
+    seen.add(key)
+    logger.warning(msg, *args)
+
 
 class JsonPlusSerializer(SerializerProtocol):
     """Serializer that uses ormsgpack, with optional fallbacks.
@@ -125,41 +157,24 @@ class JsonPlusSerializer(SerializerProtocol):
             )
         return clone
 
-    def _encode_constructor_args(
-        self,
-        constructor: Callable | type[Any],
-        *,
-        method: None | str | Sequence[None | str] = None,
-        args: Sequence[Any] | None = None,
-        kwargs: dict[str, Any] | None = None,
-    ) -> dict[str, Any]:
-        out = {
-            "lc": 2,
-            "type": "constructor",
-            "id": (*constructor.__module__.split("."), constructor.__name__),
-        }
-        if method is not None:
-            out["method"] = method
-        if args is not None:
-            out["args"] = args
-        if kwargs is not None:
-            out["kwargs"] = kwargs
-        return out
-
     def _reviver(self, value: dict[str, Any]) -> Any:
-        if self._allowed_json_modules and (
+        if (
             value.get("lc", None) == 2
             and value.get("type", None) == "constructor"
             and value.get("id", None) is not None
         ):
-            try:
-                return self._revive_lc2(value)
-            except InvalidModuleError as e:
-                logger.warning(
-                    "Object %s is not in the deserialization allowlist.\n%s",
-                    value["id"],
-                    e.message,
-                )
+            id_list = value["id"]
+            is_safe = _is_safe_json_type(id_list)
+            if self._allowed_json_modules or is_safe:
+                try:
+                    return self._revive_lc2(value)
+                except InvalidModuleError as e:
+                    if not is_safe:
+                        logger.warning(
+                            "Object %s is not in the deserialization allowlist.\n%s",
+                            value["id"],
+                            e.message,
+                        )
 
         return LC_REVIVER(value)
 
@@ -167,49 +182,57 @@ class JsonPlusSerializer(SerializerProtocol):
         self._check_allowed_json_modules(value)
 
         [*module, name] = value["id"]
+        # The `method` field on lc:2 envelopes is intentionally ignored.
+        # Revival is restricted to the default constructor (no `getattr`
+        # dispatch on attacker-influenced names). The framework's own
+        # encoder has not emitted `method=` since the msgpack migration,
+        # and the only legacy emission was `method=(None, "construct")`
+        # for pydantic models, where the first entry (`None`) already
+        # meant "default constructor", which is what we do here.
         try:
             mod = importlib.import_module(".".join(module))
             cls = getattr(mod, name)
-            method = value.get("method")
-            if isinstance(method, str):
-                methods = [getattr(cls, method)]
-            elif isinstance(method, list):
-                methods = [cls if m is None else getattr(cls, m) for m in method]
-            else:
-                methods = [cls]
+            if isclass(cls) and issubclass(cls, BaseException):
+                return None
             args = value.get("args")
             kwargs = value.get("kwargs")
-            for method in methods:
-                try:
-                    if isclass(method) and issubclass(method, BaseException):
-                        return None
-                    if args and kwargs:
-                        return method(*args, **kwargs)
-                    elif args:
-                        return method(*args)
-                    elif kwargs:
-                        return method(**kwargs)
-                    else:
-                        return method()
-                except Exception:
-                    continue
-        except Exception:
+            if args and kwargs:
+                return cls(*args, **kwargs)
+            elif args:
+                return cls(*args)
+            elif kwargs:
+                return cls(**kwargs)
+            else:
+                return cls()
+        except Exception as exc:
+            # Method-field dispatch has been removed (GHSA-fjqc-hq36-qh5p), so
+            # legacy pydantic payloads emitting `method=[None, "construct"]`
+            # no longer fall back to `cls.construct(**kwargs)` when the
+            # default constructor rejects the serialized kwargs. Surface a
+            # one-line warning so operators can spot payloads that now revive
+            # to `None` instead of silently degrading to the raw envelope.
+            logger.warning(
+                "Failed to revive lc:2 envelope %s "
+                "(legacy_method_field=%s, error=%s); returning None",
+                ".".join((*module, name)),
+                "method" in value,
+                type(exc).__name__,
+            )
             return None
 
     def _check_allowed_json_modules(self, value: dict[str, Any]) -> None:
         needed = tuple(value["id"])
-        method = value.get("method")
-        if isinstance(method, list):
-            method_display = ",".join(m or "<init>" for m in method)
-        elif isinstance(method, str):
-            method_display = method
-        else:
-            method_display = "<init>"
-
         dotted = ".".join(needed)
+        # Safe types (the same set already allowed for msgpack deserialization) are
+        # permitted without an explicit allowlist — they are known-safe LangGraph and
+        # LangChain types.  This restores backwards-compat for old "json" checkpoints
+        # that pre-date the msgpack migration without reopening the broader security gate.
+        if _is_safe_json_type(list(needed)):
+            return
+
         if not self._allowed_json_modules:
             raise InvalidModuleError(
-                f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
+                f"Refused to deserialize JSON constructor: {dotted}. "
                 "No allowed_json_modules configured.\n\n"
                 "Unblock with ONE of:\n"
                 f"  • JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -224,7 +247,7 @@ class JsonPlusSerializer(SerializerProtocol):
             return
 
         raise InvalidModuleError(
-            f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
+            f"Refused to deserialize JSON constructor: {dotted}. "
             "Symbol is not in the deserialization allowlist.\n\n"
             "Add exactly this symbol to unblock:\n"
             f"  JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -276,10 +299,13 @@ EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
 EXT_NUMPY_ARRAY = 6
+EXT_DELTA_SNAPSHOT = 7
 
 
 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
-    if hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
+    if isinstance(obj, _DeltaSnapshot):
+        return ormsgpack.Ext(EXT_DELTA_SNAPSHOT, _msgpack_enc(obj.value))
+    elif hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
         return ormsgpack.Ext(
             EXT_PYDANTIC_V2,
             _msgpack_enc(
@@ -451,10 +477,13 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
             ),
         )
     elif isinstance(obj, SendProtocol):
+        args: tuple[Any, ...] = (obj.node, obj.arg)
+        if (timeout := getattr(obj, "timeout", None)) is not None:
+            args = (obj.node, obj.arg, timeout)
         return ormsgpack.Ext(
             EXT_CONSTRUCTOR_POS_ARGS,
             _msgpack_enc(
-                (obj.__class__.__module__, obj.__class__.__name__, (obj.node, obj.arg)),
+                (obj.__class__.__module__, obj.__class__.__name__, args),
             ),
         )
     elif dataclasses.is_dataclass(obj):
@@ -505,6 +534,15 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
         raise TypeError(f"Object of type {obj.__class__.__name__} is not serializable")
 
 
+def _send_from_args(args: Sequence[Any]) -> Any:
+    # ya we have a cyclic import here ¯\_(ツ)_/¯
+    from langgraph.types import Send  # type: ignore
+
+    if len(args) == 2:
+        return Send(*args)
+    return Send(args[0], args[1], timeout=args[2])
+
+
 def _create_msgpack_ext_hook(
     allowed_modules: set[tuple[str, ...]] | Literal[True] | None,
 ) -> Callable[[int, bytes], Any]:
@@ -534,7 +572,9 @@ def _create_msgpack_ext_hook(
                     "name": name,
                 }
             )
-            logger.warning(
+            _warn_once(
+                _warned_unregistered_types,
+                key,
                 "Deserializing unregistered type %s.%s from checkpoint. "
                 "This will be blocked in a future version. "
                 "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
@@ -556,7 +596,9 @@ def _create_msgpack_ext_hook(
                 "name": name,
             }
         )
-        logger.warning(
+        _warn_once(
+            _warned_blocked_types,
+            key,
             "Blocked deserialization of %s.%s - not in allowed_msgpack_modules. "
             "Add to allowed_msgpack_modules to allow: [(%r, %r)]",
             module,
@@ -589,7 +631,13 @@ def _create_msgpack_ext_hook(
         return False
 
     def ext_hook(code: int, data: bytes) -> Any:
-        if code == EXT_CONSTRUCTOR_SINGLE_ARG:
+        if code == EXT_DELTA_SNAPSHOT:
+            return _DeltaSnapshot(
+                ormsgpack.unpackb(
+                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+                )
+            )
+        elif code == EXT_CONSTRUCTOR_SINGLE_ARG:
             try:
                 tup = ormsgpack.unpackb(
                     data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
@@ -610,6 +658,8 @@ def _create_msgpack_ext_hook(
                 )
                 if not _check_allowed(tup[0], tup[1]):
                     return tup[2]
+                if tup[0] == "langgraph.types" and tup[1] == "Send":
+                    return _send_from_args(tup[2])
                 # module, name, args
                 return getattr(importlib.import_module(tup[0]), tup[1])(*tup[2])
             except Exception:
@@ -723,9 +773,7 @@ def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
                 option=ormsgpack.OPT_NON_STR_KEYS,
             )
             if tup[0] == "langgraph.types" and tup[1] == "Send":
-                from langgraph.types import Send  # type: ignore
-
-                return Send(*tup[2])
+                return _send_from_args(tup[2])
             # module, name, args
             return tup[2]
         except Exception:

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

@@ -1,6 +1,7 @@
 from collections.abc import Sequence
 from typing import (
     Any,
+    NamedTuple,
     Protocol,
     TypeVar,
     runtime_checkable,
@@ -14,6 +15,22 @@ INTERRUPT = "__interrupt__"
 RESUME = "__resume__"
 TASKS = "__pregel_tasks"
 
+
+class _DeltaSnapshot(NamedTuple):
+    """Snapshot blob for a DeltaChannel with finite snapshot_frequency.
+
+    Stored in checkpoint_blobs via the `EXT_DELTA_SNAPSHOT` msgpack ext code.
+    The ancestor walk in `BaseCheckpointSaver.get_delta_channel_history` terminates
+    when it encounters this type (any non-empty channel_values entry stops
+    the walk for that channel).
+
+    `from_checkpoint` reconstructs the channel value directly from `.value`
+    without replaying writes — the snapshot IS the accumulated state.
+    """
+
+    value: Any
+
+
 Value = TypeVar("Value", covariant=True)
 Update = TypeVar("Update", contravariant=True)
 C = TypeVar("C")

libs/checkpoint/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.1.1"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -18,7 +18,7 @@ dependencies = [
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 

libs/checkpoint/tests/test_conformance_delta.py

@@ -0,0 +1,33 @@
+"""Run delta-channel conformance capabilities against InMemorySaver."""
+
+from __future__ import annotations
+
+import pytest
+
+conformance = pytest.importorskip(
+    "langgraph.checkpoint.conformance",
+    reason="langgraph-checkpoint-conformance not installed",
+)
+
+
+@pytest.mark.asyncio
+async def test_delta_channel_conformance():
+    from langgraph.checkpoint.conformance import validate
+    from langgraph.checkpoint.conformance.initializer import checkpointer_test
+
+    from langgraph.checkpoint.memory import InMemorySaver
+
+    @checkpointer_test(name="InMemorySaver")
+    async def mem_saver():
+        yield InMemorySaver()
+
+    report = await validate(
+        mem_saver,
+        capabilities={
+            "delta_channel_history",
+        },
+    )
+    for cap, result in report.results.items():
+        if result.passed is False:
+            details = "\n".join(result.failures or [])
+            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint/tests/test_encrypted.py

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

libs/checkpoint/tests/test_jsonplus.py

@@ -35,6 +35,8 @@ from langgraph.checkpoint.serde.jsonplus import (
     JsonPlusSerializer,
     _msgpack_enc,
     _msgpack_ext_hook_to_json,
+    _warned_blocked_types,
+    _warned_unregistered_types,
 )
 from langgraph.store.base import Item
 
@@ -331,6 +333,57 @@ def test_serde_jsonplus_bytes() -> None:
     assert serde.loads_typed(dumped) == some_bytes
 
 
+def test_lc2_json_safe_type_revives_without_allowlist() -> None:
+    """Old 'json' blobs with lc=2 for safe types must revive without an explicit allowlist.
+
+    Regression test for: https://github.com/langchain-ai/langgraph/issues/7498
+    Threads checkpointed before v1.0.1 (pre-msgpack) stored messages as lc=2 JSON
+    constructor dicts. Resuming those threads must reconstruct proper BaseMessage objects
+    rather than returning raw dicts that cause MESSAGE_COERCION_FAILURE in add_messages.
+    """
+    from langchain_core.messages import AIMessage
+
+    serde = JsonPlusSerializer()  # default: _allowed_json_modules=None
+
+    human_blob = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "human", "HumanMessage"],
+        "kwargs": {"content": "hello", "type": "human"},
+    }
+    ai_blob = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "kwargs": {"content": "hi there", "type": "ai"},
+    }
+    result = serde.loads_typed(("json", json.dumps([human_blob, ai_blob]).encode()))
+
+    assert len(result) == 2
+    assert isinstance(result[0], HumanMessage), (
+        f"Expected HumanMessage, got {type(result[0])}: {result[0]!r}\n"
+        "lc=2 JSON blobs for safe types must deserialize without an explicit allowlist"
+    )
+    assert result[0].content == "hello"
+    assert isinstance(result[1], AIMessage)
+    assert result[1].content == "hi there"
+
+
+def test_lc2_json_unknown_type_stays_blocked_without_allowlist() -> None:
+    """lc=2 JSON blobs for types NOT in SAFE_MSGPACK_TYPES still require an allowlist."""
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["pprint", "pprint"],
+        "kwargs": {"object": "HELLO"},
+    }
+    # No allowlist configured → raw dict returned (not raised, not reconstructed)
+    result = serde.loads_typed(("json", json.dumps(load).encode()))
+    assert isinstance(result, dict), "Unknown lc=2 type must stay as raw dict"
+    assert result.get("lc") == 2
+
+
 def test_deserde_invalid_module() -> None:
     serde = JsonPlusSerializer()
     load = {
@@ -345,6 +398,193 @@ def test_deserde_invalid_module() -> None:
     serde.loads_typed(("json", json.dumps(load).encode("utf-8")))
 
 
+def test_lc2_json_method_field_is_ignored() -> None:
+    """The `method` field on lc=2 envelopes is ignored.
+
+    Regression test for GHSA-fjqc-hq36-qh5p: `_revive_lc2` previously resolved
+    `getattr(cls, method)` from the envelope, which let an attacker pivot a
+    safe pydantic class (e.g., AIMessage) to `parse_raw(..., allow_pickle=True)`
+    and reach `pickle.loads`. Revival now uses only the default constructor.
+
+    Verifies that an envelope carrying ``method="parse_raw"`` does not dispatch
+    to that method: the result is whatever ``AIMessage(*args, **kwargs)`` would
+    produce, which proves the default constructor ran instead of ``parse_raw``.
+    """
+    from langchain_core.messages import AIMessage
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": ["default-ctor-ran"],
+        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
+    }
+    result = serde._revive_lc2(load)
+    # Default constructor accepts `content` as first positional arg. If parse_raw
+    # had been invoked instead, it would have attempted JSON/pickle parsing and
+    # raised (or executed the pickle gadget); neither would produce this result.
+    assert isinstance(result, AIMessage)
+    assert result.content == "default-ctor-ran"
+
+
+def test_lc2_json_method_field_is_ignored_for_allowlisted_types() -> None:
+    """The `method` field is ignored even when the class is explicitly allowlisted.
+
+    A user who configures ``allowed_json_modules`` for a class no longer gets
+    method dispatch as a side effect. Revival is restricted to the default
+    constructor regardless of how the class reached the revival path.
+    """
+    from langchain_core.messages import AIMessage
+
+    serde = JsonPlusSerializer(
+        allowed_json_modules=[("langchain_core.messages.ai", "AIMessage")]
+    )
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": ["default-ctor-ran"],
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "default-ctor-ran"
+
+
+def test_lc2_json_safe_type_init_still_works() -> None:
+    """SAFE-type lc=2 revival without a `method` field still constructs the class."""
+    from langchain_core.messages import AIMessage
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "kwargs": {"content": "hi", "type": "ai"},
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "hi"
+
+
+def test_lc2_json_legacy_pydantic_method_list_falls_back_to_default() -> None:
+    """Legacy ``method=(None, "construct")`` envelopes still revive via the default ctor.
+
+    Pre-October-2025 langgraph emitted pydantic models with
+    ``method=(None, "construct")`` meaning "try default constructor, fall back
+    to pydantic ``construct``". The first entry (``None``) was always the
+    default constructor, which is what we now do unconditionally. Envelopes of
+    this shape continue to revive correctly as long as the default constructor
+    accepts the serialized kwargs.
+    """
+    from langchain_core.messages import AIMessage
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": [None, "construct"],
+        "kwargs": {"content": "legacy", "type": "ai"},
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "legacy"
+
+
+def test_lc2_json_legacy_construct_payload_logs_warning_when_default_init_rejects(
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Legacy `method=[None, "construct"]` envelopes whose kwargs the default
+    `__init__` rejects now revive to `None` and emit an observable warning.
+
+    Pre-October-2025 langgraph emitted pydantic payloads with
+    `method=[None, "construct"]` so the reviver could fall back to
+    `cls.construct(**kwargs)` when the default constructor raised a
+    validation error. That fallback was removed with method-field dispatch
+    (GHSA-fjqc-hq36-qh5p), so these payloads now silently fail validation. A
+    `logger.warning` makes the regression observable to operators instead of
+    letting the envelope quietly degrade to its raw-dict form.
+    """
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        # Legacy two-entry method tuple: try default ctor, fall back to construct.
+        "method": [None, "construct"],
+        # ``type="not-a-real-message-type"`` fails AIMessage's Literal["ai"]
+        # validator under the default constructor. Before the GHSA patch this
+        # would have fallen back to ``cls.construct(**kwargs)``; now it must
+        # return None and log.
+        "kwargs": {"content": "legacy", "type": "not-a-real-message-type"},
+    }
+
+    with caplog.at_level(logging.WARNING, logger="langgraph.checkpoint.serde.jsonplus"):
+        result = serde._revive_lc2(load)
+
+    assert result is None, (
+        "Legacy method=[None, 'construct'] payloads with kwargs the default "
+        "ctor rejects must now return None (no construct() fallback)."
+    )
+
+    matching = [
+        r
+        for r in caplog.records
+        if r.name == "langgraph.checkpoint.serde.jsonplus"
+        and r.levelno == logging.WARNING
+        and "langchain_core.messages.ai.AIMessage" in r.getMessage()
+        and "legacy_method_field=True" in r.getMessage()
+    ]
+    assert matching, (
+        "Expected a WARNING from langgraph.checkpoint.serde.jsonplus "
+        "referencing the class id and legacy_method_field=True; "
+        f"got records: {[(r.name, r.levelname, r.getMessage()) for r in caplog.records]}"
+    )
+
+
+def test_lc2_json_safe_type_pickle_payload_does_not_execute() -> None:
+    """End-to-end: a `parse_raw` pickle gadget payload on a SAFE type must not run.
+
+    With method dispatch removed from `_revive_lc2`, the gadget bytes are never
+    passed to `parse_raw` and therefore never reach `pickle.loads`.
+    """
+    import os
+    import pickle
+    import tempfile
+
+    marker = tempfile.NamedTemporaryFile(
+        prefix="lc2_block_proof_", suffix=".out", delete=False
+    ).name
+    os.remove(marker)  # ensure absent before the test runs
+
+    class _Gadget:
+        def __reduce__(self) -> tuple:
+            return (os.system, (f"touch {marker}",))
+
+    gadget_bytes = pickle.dumps(_Gadget(), protocol=0).decode("latin1")
+    envelope = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": [gadget_bytes],
+        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
+    }
+
+    serde = JsonPlusSerializer()
+    try:
+        serde.loads_typed(("json", json.dumps(envelope).encode()))
+    except Exception:
+        pass
+
+    assert not os.path.exists(marker), (
+        "Pickle gadget executed via parse_raw on AIMessage lc=2 envelope"
+    )
+
+
 def test_serde_jsonplus_bytearray() -> None:
     serde = JsonPlusSerializer()
 
@@ -580,6 +820,14 @@ def test_msgpack_safe_types_no_warning(caplog: pytest.LogCaptureFixture) -> None
         assert result is not None
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) -> None:
     """Pydantic models not in allowlist should log warning but still deserialize."""
     current = _lg_msgpack.STRICT_MSGPACK_ENABLED
@@ -595,6 +843,12 @@ def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) ->
     assert "unregistered type" in caplog.text.lower()
     assert "allowed_msgpack_modules" in caplog.text
     assert result == obj
+
+    # Second deserialization of the same type should NOT produce another warning
+    caplog.clear()
+    result2 = serde.loads_typed(dumped)
+    assert "unregistered type" not in caplog.text.lower()
+    assert result2 == obj
     _lg_msgpack.STRICT_MSGPACK_ENABLED = current
 
 
@@ -639,7 +893,6 @@ def test_msgpack_allowlist_silences_warning(caplog: pytest.LogCaptureFixture) ->
 
 def test_msgpack_none_blocks_unregistered(caplog: pytest.LogCaptureFixture) -> None:
     """allowed_msgpack_modules=None should block unregistered types."""
-
     serde = JsonPlusSerializer(allowed_msgpack_modules=None)
 
     obj = MyPydantic(foo="test", bar=42, inner=InnerPydantic(hello="world"))
@@ -657,7 +910,6 @@ def test_msgpack_allowlist_blocks_non_listed(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Allowlists should block unregistered types even if msgpack is enabled."""
-
     serde = JsonPlusSerializer(
         allowed_msgpack_modules=[("tests.test_jsonplus", "MyPydantic")]
     )

libs/checkpoint/tests/test_memory.py

@@ -12,13 +12,25 @@ from langgraph.checkpoint.base import (
     empty_checkpoint,
 )
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+from langgraph.checkpoint.serde.jsonplus import (
+    JsonPlusSerializer,
+    _warned_blocked_types,
+    _warned_unregistered_types,
+)
 
 
 class MemoryPydantic(BaseModel):
     foo: str
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 class TestMemorySaver:
     @pytest.fixture(autouse=True)
     def setup(self) -> None:
@@ -196,8 +208,6 @@ class TestMemorySaver:
 
 
 async def test_memory_saver() -> None:
-    from langgraph.checkpoint.memory import InMemorySaver
-
     memory_saver = InMemorySaver()
     assert isinstance(memory_saver, InMemorySaver)
 
@@ -308,3 +318,363 @@ def test_memory_saver_with_allowlist_proxy_isolated() -> None:
     assert direct is not None
     expected = obj.model_dump() if hasattr(obj, "model_dump") else obj.dict()
     assert direct.checkpoint["channel_values"]["foo"] == expected
+
+
+class TestInMemorySaverDeltaChannel:
+    def test_load_blobs_omits_delta_channel(self) -> None:
+        """_load_blobs omits delta channels (stored as 'empty'); reconstruction deferred."""
+        saver = InMemorySaver()
+
+        thread_id, ns, channel = "t1", "", "messages"
+        v1 = "00000000000000000000000000000001.0000000000000000"
+
+        saver.blobs[(thread_id, ns, channel, v1)] = ("empty", b"")
+
+        result = saver._load_blobs(thread_id, ns, {channel: v1})
+        assert channel not in result
+
+    def test_get_channel_writes_collects_ancestor_writes_only(self) -> None:
+        """`get_delta_channel_history` collects ancestor writes oldest→newest, and
+        excludes writes stored at the target checkpoint itself (those are
+        pending writes for the next step, applied separately by pregel).
+
+        When the walk reaches the root without finding any stored value for
+        the channel, the per-channel entry has no `seed` key (TypedDict
+        absence indicates "start empty").
+        """
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+        }
+        # Writes stored at cp1 produced the cp1 snapshot; part of history.
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "hi"}),
+            "",
+        )
+        # Writes stored at cp2 are pending — they will produce cp3 when the
+        # step that loaded cp2 completes. They MUST NOT appear in the
+        # reconstructed snapshot value at cp2.
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp2",
+            }
+        }
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+        # Walk reached the root without finding a stored value → no `seed` key.
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "hi"}]
+
+    def test_get_channel_writes_at_root_returns_empty(self) -> None:
+        """Reconstructing the root checkpoint's state: no ancestors → []."""
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+        }
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp1",
+            }
+        }
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+        # No ancestors → no seed found, no writes accumulated.
+        assert "seed" not in result
+        assert result["writes"] == []
+
+
+class TestBaseFallbackGetChannelWrites:
+    """Exercises the `BaseCheckpointSaver.get_delta_channel_history` default
+    implementation — the path third-party savers inherit when they don't
+    override `get_delta_channel_history` themselves.
+
+    Regression guard for a bug where the fallback passed the caller's config
+    (with `checkpoint_id`) straight to `self.list()`, which most savers
+    collapse to a single row — causing the fallback to return `[]`.
+    """
+
+    def _build_saver_with_chain(self) -> tuple[InMemorySaver, str, str]:
+        """Build an InMemorySaver with a 3-checkpoint chain and per-step writes
+        for a `messages` channel.
+
+        Returns `(saver, thread_id, namespace)`. The saver subclass deletes the
+        InMemorySaver override so the base class fallback is exercised.
+        """
+
+        class _ThirdPartyStyleSaver(InMemorySaver):
+            get_delta_channel_history = (
+                InMemorySaver.__mro__[1].get_delta_channel_history  # type: ignore[attr-defined]
+            )
+            aget_delta_channel_history = (
+                InMemorySaver.__mro__[1].aget_delta_channel_history  # type: ignore[attr-defined]
+            )
+
+        saver = _ThirdPartyStyleSaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp0 = empty_checkpoint()
+        cp0["id"] = "00000000000000000000000000000001.0000000000000000"
+        cp1 = empty_checkpoint()
+        cp1["id"] = "00000000000000000000000000000002.0000000000000000"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "00000000000000000000000000000003.0000000000000000"
+        saver.storage[thread_id][ns] = {
+            cp0["id"]: (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
+            cp1["id"]: (serde.dumps_typed(cp1), serde.dumps_typed({}), cp0["id"]),
+            cp2["id"]: (serde.dumps_typed(cp2), serde.dumps_typed({}), cp1["id"]),
+        }
+        # Writes under cp0 produced cp1's state; writes under cp1 produced cp2's.
+        saver.writes[(thread_id, ns, cp0["id"])][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "first"}),
+            "",
+        )
+        saver.writes[(thread_id, ns, cp1["id"])][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "second"}),
+            "",
+        )
+        return saver, thread_id, ns
+
+    def test_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=["messages"])[
+            "messages"
+        ]
+
+        # Walk reached root without a stored value → `seed` key absent.
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = (
+            await saver.aget_delta_channel_history(config=config, channels=["messages"])
+        )["messages"]
+
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_concurrent_tasks_do_not_interfere(self) -> None:
+        """Regression: the re-entrancy guard must be task-local, not thread-local.
+
+        Two concurrent `aget_delta_channel_history` calls on the same event-loop
+        thread must each see their full reconstructed writes. A
+        `threading.local()` guard would let whichever task set it first
+        short-circuit the other to `writes=[]`.
+        """
+        import asyncio
+
+        saver, thread_id, ns = self._build_saver_with_chain()
+
+        # Force the two tasks to interleave across the `set(True)` boundary:
+        # each `aget_tuple` yields control, so if the guard were thread-local
+        # the second task would observe `active=True` set by the first.
+        orig_aget_tuple = saver.aget_tuple
+
+        async def slow_aget_tuple(config: RunnableConfig) -> Any:
+            await asyncio.sleep(0)
+            return await orig_aget_tuple(config)
+
+        saver.aget_tuple = slow_aget_tuple  # type: ignore[method-assign]
+
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        results = await asyncio.gather(
+            saver.aget_delta_channel_history(config=config, channels=["messages"]),
+            saver.aget_delta_channel_history(config=config, channels=["messages"]),
+        )
+
+        expected_values = [{"content": "first"}, {"content": "second"}]
+        for result_map in results:
+            result = result_map["messages"]
+            assert "seed" not in result
+            values = [v for _, _, v in result["writes"]]
+            assert values == expected_values
+
+
+class TestPreDeltaBlobTerminator:
+    """Verify the pre-delta blob terminator: when the ancestor walk hits a
+    checkpoint whose blob for the channel is a real value, reconstruction
+    seeds from it and stops. This guards
+
+      * back-compat: a thread written by pre-delta code, then extended under
+        delta — reconstruction must return the correct value without walking
+        past the last pre-delta ancestor;
+      * perf: without the terminator, every reconstruct-after-migration would
+        walk all the way to the thread root.
+
+    Under the new public API a found seed populates `seed` in the
+    `DeltaChannelHistory` TypedDict; absence of the `seed` key means the walk
+    reached root without finding a stored value.
+    """
+
+    def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
+        """Three-checkpoint chain: cp1 (pre-delta, blob=[A]), cp2 (delta,
+        write=B), cp3 (delta, write=C). Reconstructing at cp3 must yield
+        seed=[A] + writes=[B, C].
+
+        Returns `(saver, thread_id, ns, channel, cp3_id)`.
+        """
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        v1 = "00000000000000000000000000000001.0"
+        v2 = "00000000000000000000000000000002.0"
+        v3 = "00000000000000000000000000000003.0"
+
+        # Pre-delta: cp1 stored a real blob for the channel.
+        saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(["A"])
+        # Delta-era: cp2 and cp3 store "empty"; real writes in checkpoint_writes.
+        saver.blobs[(thread_id, ns, channel, v2)] = ("empty", b"")
+        saver.blobs[(thread_id, ns, channel, v3)] = ("empty", b"")
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp1["channel_versions"][channel] = v1
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        cp2["channel_versions"][channel] = v2
+        cp3 = empty_checkpoint()
+        cp3["id"] = "cp3"
+        cp3["channel_versions"][channel] = v3
+
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+            "cp3": (serde.dumps_typed(cp3), serde.dumps_typed({}), "cp2"),
+        }
+        # Write under cp1 would be from the pre-delta era and MUST be ignored
+        # (the blob already captures it). We add one and assert it is not
+        # folded into the reconstructed result.
+        saver.writes[(thread_id, ns, "cp1")][("task0", 0)] = (
+            "task0",
+            channel,
+            serde.dumps_typed("PRE-DELTA-WRITE"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed("B"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp3")][("task3", 0)] = (
+            "task3",
+            channel,
+            serde.dumps_typed("PENDING-AT-TARGET"),
+            "",
+        )
+        return saver, thread_id, ns, channel, "cp3"
+
+    def test_seed_from_pre_delta_ancestor_blob(self) -> None:
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+
+        # Seed came from the pre-delta blob at cp1.
+        assert result["seed"] == ["A"]
+        # Delta-era writes from cp2 replay through the reducer on top of seed.
+        # cp3 is the target — its own write is pending for the NEXT step and
+        # must be excluded.
+        values = [v for _, _, v in result["writes"]]
+        assert values == ["B"]
+
+    def test_pre_delta_blob_terminates_walk_before_older_writes(self) -> None:
+        """Writes stored at the pre-delta ancestor itself must not be replayed
+        (the blob subsumes them)."""
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+
+        values = [v for _, _, v in result["writes"]]
+        # The pre-delta write under cp1 must not appear (the blob subsumes it).
+        assert "PRE-DELTA-WRITE" not in values
+        # And the pending write at the target is never folded in.
+        assert "PENDING-AT-TARGET" not in values

libs/checkpoint/uv.lock

@@ -2,7 +2,8 @@ version = 1
 revision = 3
 requires-python = ">=3.10"
 resolution-markers = [
-    "python_full_version >= '3.12'",
+    "python_full_version >= '3.15'",
+    "python_full_version >= '3.12' and python_full_version < '3.15'",
     "python_full_version == '3.11.*'",
     "python_full_version < '3.11'",
 ]
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@@ -267,10 +268,11 @@ wheels = [
 
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-version = "1.2.28"
+version = "1.3.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -279,14 +281,26 @@ dependencies = [
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+[[package]]
+name = "langchain-protocol"
+version = "0.0.15"
+source = { registry = "https://pypi.org/simple" }
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+    { name = "typing-extensions" },
+]
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 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.1.1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
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+version = "0.8.0"
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@@ -379,11 +393,12 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
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+    { name = "xxhash" },
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 [[package]]
 name = "zstandard"
 version = "0.25.0"

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

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

libs/cli/examples/graph_prerelease_reqs/pyproject.toml

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

libs/cli/examples/graph_prerelease_reqs_fail/pyproject.toml

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

libs/cli/js-examples/package.json

@@ -21,25 +21,25 @@
     "test:all": "yarn test && yarn test:int && yarn lint:langgraph"
   },
   "dependencies": {
-    "@langchain/core": "^1.1.38",
-    "@langchain/langgraph": "^1.2.6"
+    "@langchain/core": "^1.1.42",
+    "@langchain/langgraph": "^1.2.9"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.5",
     "@eslint/js": "^10.0.1",
     "@tsconfig/recommended": "^1.0.13",
     "@types/jest": "^30.0.0",
-    "@typescript-eslint/eslint-plugin": "^8.58.0",
-    "@typescript-eslint/parser": "^8.58.0",
-    "dotenv": "^17.3.1",
-    "eslint": "^10.1.0",
+    "@typescript-eslint/eslint-plugin": "^8.59.1",
+    "@typescript-eslint/parser": "^8.59.1",
+    "dotenv": "^17.4.2",
+    "eslint": "^10.2.1",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-no-instanceof": "^1.0.1",
     "eslint-plugin-prettier": "^5.5.5",
     "jest": "^30.3.0",
-    "prettier": "^3.8.1",
-    "ts-jest": "^29.4.6",
+    "prettier": "^3.8.3",
+    "ts-jest": "^29.4.9",
     "typescript": "^5.9.3"
   }
 }

libs/cli/js-examples/yarn.lock

@@ -474,26 +474,26 @@
   resolved "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.12.2.tgz#bccdf615bcf7b6e8db830ec0b8d21c9a25de597b"
   integrity sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==
 
-"@eslint/config-array@^0.23.3":
-  version "0.23.3"
-  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.23.3.tgz#3f4a93dd546169c09130cbd10f2415b13a20a219"
-  integrity sha512-j+eEWmB6YYLwcNOdlwQ6L2OsptI/LO6lNBuLIqe5R7RetD658HLoF+Mn7LzYmAWWNNzdC6cqP+L6r8ujeYXWLw==
+"@eslint/config-array@^0.23.5":
+  version "0.23.5"
+  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.23.5.tgz#56e86d243049195d8acc0c06a1b3dfdc3fa3de95"
+  integrity sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==
   dependencies:
-    "@eslint/object-schema" "^3.0.3"
+    "@eslint/object-schema" "^3.0.5"
     debug "^4.3.1"
     minimatch "^10.2.4"
 
-"@eslint/config-helpers@^0.5.3":
-  version "0.5.3"
-  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.5.3.tgz#721fe6bbb90d74b0c80d6ff2428e5bbcb002becb"
-  integrity sha512-lzGN0onllOZCGroKJmRwY6QcEHxbjBw1gwB8SgRSqK8YbbtEXMvKynsXc3553ckIEBxsbMBU7oOZXKIPGZNeZw==
+"@eslint/config-helpers@^0.5.5":
+  version "0.5.5"
+  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.5.5.tgz#ae16134e4792ac5fbdc533548a24ac1ea9f7f3ae"
+  integrity sha512-eIJYKTCECbP/nsKaaruF6LW967mtbQbsw4JTtSVkUQc9MneSkbrgPJAbKl9nWr0ZeowV8BfsarBmPpBzGelA2w==
   dependencies:
-    "@eslint/core" "^1.1.1"
+    "@eslint/core" "^1.2.1"
 
-"@eslint/core@^1.1.1":
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-1.1.1.tgz#450f3d2be2d463ccd51119544092256b4e88df32"
-  integrity sha512-QUPblTtE51/7/Zhfv8BDwO0qkkzQL7P/aWWbqcf4xWLEYn1oKjdO0gglQBB4GAsu7u6wjijbCmzsUTy6mnk6oQ==
+"@eslint/core@^1.2.1":
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-1.2.1.tgz#c1da7cd1b82fa8787f98b5629fb811848a1b63ce"
+  integrity sha512-MwcE1P+AZ4C6DWlpin/OmOA54mmIZ/+xZuJiQd4SyB29oAJjN30UW9wkKNptW2ctp4cEsvhlLY/CsQ1uoHDloQ==
   dependencies:
     "@types/json-schema" "^7.0.15"
 
@@ -517,17 +517,17 @@
   resolved "https://registry.yarnpkg.com/@eslint/js/-/js-10.0.1.tgz#1e8a876f50117af8ab67e47d5ad94d38d6622583"
   integrity sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==
 
-"@eslint/object-schema@^3.0.3":
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-3.0.3.tgz#5bf671e52e382e4adc47a9906f2699374637db6b"
-  integrity sha512-iM869Pugn9Nsxbh/YHRqYiqd23AmIbxJOcpUMOuWCVNdoQJ5ZtwL6h3t0bcZzJUlC3Dq9jCFCESBZnX0GTv7iQ==
+"@eslint/object-schema@^3.0.5":
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-3.0.5.tgz#88e9bf4d11d2b19c082e78ebe7ce88724a5eb091"
+  integrity sha512-vqTaUEgxzm+YDSdElad6PiRoX4t8VGDjCtt05zn4nU810UIx/uNEV7/lZJ6KwFThKZOzOxzXy48da+No7HZaMw==
 
-"@eslint/plugin-kit@^0.6.1":
-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.6.1.tgz#eb9e6689b56ce8bc1855bb33090e63f3fc115e8e"
-  integrity sha512-iH1B076HoAshH1mLpHMgwdGeTs0CYwL0SPMkGuSebZrwBp16v415e9NZXg2jtrqPVQjf6IANe2Vtlr5KswtcZQ==
+"@eslint/plugin-kit@^0.7.1":
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.7.1.tgz#c4125fd015eceeb09b793109fdbcd4dd0a02d346"
+  integrity sha512-rZAP3aVgB9ds9KOeUSL+zZ21hPmo8dh6fnIFwRQj5EAZl9gzR7wxYbYXYysAM8CTqGmUGyp2S4kUdV17MnGuWQ==
   dependencies:
-    "@eslint/core" "^1.1.1"
+    "@eslint/core" "^1.2.1"
     levn "^0.4.1"
 
 "@humanfs/core@^0.19.1":
@@ -890,10 +890,10 @@
     "@jridgewell/resolve-uri" "^3.1.0"
     "@jridgewell/sourcemap-codec" "^1.4.14"
 
-"@langchain/core@^1.1.38":
-  version "1.1.38"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.38.tgz#b5939b2e77af408771c9bb95bf56a5ad8183313e"
-  integrity sha512-C340wH1YL10CiVOFlEpQMp0zQE85/eBLKX/gi1Lv7shAyUmR3CQ0t/mXlCd5RsZa6ntAN1kDJnp64ArWey9XAA==
+"@langchain/core@^1.1.42":
+  version "1.1.42"
+  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.42.tgz#607bfd34c1414c9cbeb2859fda1b254a14c28085"
+  integrity sha512-d0tN96BrwPMryYyWR9VfyAntSivn7EQrZCe5Kpxum93tcjTXbKKmKvItFec8AluQt88iTcmAJrahUZUNfzGwTA==
   dependencies:
     "@cfworker/json-schema" "^4.0.2"
     "@standard-schema/spec" "^1.1.0"
@@ -904,7 +904,6 @@
     langsmith ">=0.5.0 <1.0.0"
     mustache "^4.2.0"
     p-queue "^6.6.2"
-    uuid "^11.1.0"
     zod "^3.25.76 || ^4"
 
 "@langchain/langgraph-checkpoint@^1.0.1":
@@ -914,23 +913,23 @@
   dependencies:
     uuid "^10.0.0"
 
-"@langchain/langgraph-sdk@~1.8.1":
-  version "1.8.3"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.8.3.tgz#deedc9bddd863693c6ab5f3a74058548b040377d"
-  integrity sha512-Py0S5yVtlOHz410aEsSGLRKjtsK2giDvfPS1JjAjTdcs71khuJufFtUZFwmwdJCbsG4DaGurRLHOAJu9jO4a0g==
+"@langchain/langgraph-sdk@~1.8.9":
+  version "1.8.10"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.8.10.tgz#bd175cda1ab629845ef28b22b45f3bdd1f65b029"
+  integrity sha512-wrB3rkRw5KAmsqezwvKP3midT4qJrV6Hj9XJMYo+cbvXC4HYpSAmyY/VriSyeTFRbLG/OP/pY2Yz+9Z54nSaXQ==
   dependencies:
     "@types/json-schema" "^7.0.15"
     p-queue "^9.0.1"
     p-retry "^7.1.1"
     uuid "^13.0.0"
 
-"@langchain/langgraph@^1.2.6":
-  version "1.2.6"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.6.tgz#e6a578f96fbbc1c54ba78e0298884671dad5d195"
-  integrity sha512-5cX402dNGN6w9+0mlMU2dgUiKx6Y1tlENp7x05e9ByDbQCHSDc0kyqRWNFLGc7vatQ92S4ylxQrcCJvi8Fr4SQ==
+"@langchain/langgraph@^1.2.9":
+  version "1.2.9"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.9.tgz#4f0ba159062c3649c83cf5f621ef926b96933e32"
+  integrity sha512-3c7BtGycHC2v9p6w/Hv8L7kEl1YnZYOQTDJtmAp3knk6JOedO7d2bYP3y0SRyhv5orUEGf/KGvx8ZsB/ideP7g==
   dependencies:
     "@langchain/langgraph-checkpoint" "^1.0.1"
-    "@langchain/langgraph-sdk" "~1.8.1"
+    "@langchain/langgraph-sdk" "~1.8.9"
     "@standard-schema/spec" "1.1.0"
     uuid "^10.0.0"
 
@@ -1098,100 +1097,100 @@
   dependencies:
     "@types/yargs-parser" "*"
 
-"@typescript-eslint/eslint-plugin@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.58.0.tgz#ad40e492f1931f46da1bd888e52b9e56df9063aa"
-  integrity sha512-RLkVSiNuUP1C2ROIWfqX+YcUfLaSnxGE/8M+Y57lopVwg9VTYYfhuz15Yf1IzCKgZj6/rIbYTmJCUSqr76r0Wg==
+"@typescript-eslint/eslint-plugin@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.59.1.tgz#781bc6f9002982cfaf75a185240e24ad7276628a"
+  integrity sha512-BOziFIfE+6osHO9FoJG4zjoHUcvI7fTNBSpdAwrNH0/TLvzjsk2oo8XSSOT2HhqUyhZPfHv4UOffoJ9oEEQ7Ag==
   dependencies:
     "@eslint-community/regexpp" "^4.12.2"
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/type-utils" "8.58.0"
-    "@typescript-eslint/utils" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/type-utils" "8.59.1"
+    "@typescript-eslint/utils" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     ignore "^7.0.5"
     natural-compare "^1.4.0"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/parser@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.58.0.tgz#da04ece1967b6c2fe8f10c3473dabf3825795ef7"
-  integrity sha512-rLoGZIf9afaRBYsPUMtvkDWykwXwUPL60HebR4JgTI8mxfFe2cQTu3AGitANp4b9B2QlVru6WzjgB2IzJKiCSA==
+"@typescript-eslint/parser@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.59.1.tgz#835d20a62350659a082a1ae2a60b822c40488905"
+  integrity sha512-HDQH9O/47Dxi1ceDhBXdaldtf/WV9yRYMjbjCuNk3qnaTD564qwv61Y7+gTxwxRKzSrgO5uhtw584igXVuuZkA==
   dependencies:
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     debug "^4.4.3"
 
-"@typescript-eslint/project-service@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.58.0.tgz#66ceda0aabf7427aec3e2713fa43eb278dead2aa"
-  integrity sha512-8Q/wBPWLQP1j16NxoPNIKpDZFMaxl7yWIoqXWYeWO+Bbd2mjgvoF0dxP2jKZg5+x49rgKdf7Ck473M8PC3V9lg==
+"@typescript-eslint/project-service@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.59.1.tgz#49efe87c37ef84262f23df8bf62fdc56698ca6fe"
+  integrity sha512-+MuHQlHiEr00Of/IQbE/MmEoi44znZHbR/Pz7Opq4HryUOlRi+/44dro9Ycy8Fyo+/024IWtw8m4JUMCGTYxDg==
   dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.58.0"
-    "@typescript-eslint/types" "^8.58.0"
+    "@typescript-eslint/tsconfig-utils" "^8.59.1"
+    "@typescript-eslint/types" "^8.59.1"
     debug "^4.4.3"
 
-"@typescript-eslint/scope-manager@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.58.0.tgz#e304142775e49a1b7ac3c8bf2536714447c72cab"
-  integrity sha512-W1Lur1oF50FxSnNdGp3Vs6P+yBRSmZiw4IIjEeYxd8UQJwhUF0gDgDD/W/Tgmh73mxgEU3qX0Bzdl/NGuSPEpQ==
+"@typescript-eslint/scope-manager@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.59.1.tgz#ed90d054fc3db2d0c81464db3a953a94fb85bb58"
+  integrity sha512-LwuHQI4pDOYVKvmH2dkaJo6YZCSgouVgnS/z7yBPKBMvgtBvyLqiLy9Z6b7+m/TRcX1NFYUqZetI5Y+aT4GEfg==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
 
-"@typescript-eslint/tsconfig-utils@8.58.0", "@typescript-eslint/tsconfig-utils@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.58.0.tgz#c5a8edb21f31e0fdee565724e1b984171c559482"
-  integrity sha512-doNSZEVJsWEu4htiVC+PR6NpM+pa+a4ClH9INRWOWCUzMst/VA9c4gXq92F8GUD1rwhNvRLkgjfYtFXegXQF7A==
+"@typescript-eslint/tsconfig-utils@8.59.1", "@typescript-eslint/tsconfig-utils@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.59.1.tgz#ba2a779a444f1d5cb92a606f9b209d239fd4cab1"
+  integrity sha512-/0nEyPbX7gRsk0Uwfe4ALwwgxuA66d/l2mhRDNlAvaj4U3juhUtJNq0DsY8M2AYwwb9rEq2hrC3IcIcEt++iJA==
 
-"@typescript-eslint/type-utils@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.58.0.tgz#ce0e72cd967ffbbe8de322db6089bd4374be352f"
-  integrity sha512-aGsCQImkDIqMyx1u4PrVlbi/krmDsQUs4zAcCV6M7yPcPev+RqVlndsJy9kJ8TLihW9TZ0kbDAzctpLn5o+lOg==
+"@typescript-eslint/type-utils@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.59.1.tgz#9c83d3f2ed9187a815e8120f72c08317e513e409"
+  integrity sha512-klWPBR2ciQHS3f++ug/mVnWKPjBUo7icEL3FAO1lhAR1Z1i5NQYZ1EannMSRYcq5qCv5wNALlXr6fksRHyYl7w==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
-    "@typescript-eslint/utils" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/utils" "8.59.1"
     debug "^4.4.3"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/types@8.58.0", "@typescript-eslint/types@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.58.0.tgz#e94ae7abdc1c6530e71183c1007b61fa93112a5a"
-  integrity sha512-O9CjxypDT89fbHxRfETNoAnHj/i6IpRK0CvbVN3qibxlLdo5p5hcLmUuCCrHMpxiWSwKyI8mCP7qRNYuOJ0Uww==
+"@typescript-eslint/types@8.59.1", "@typescript-eslint/types@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.59.1.tgz#c1d014d3f03a97e0113a8899fc9d4e45a7fb0ca9"
+  integrity sha512-ZDCjgccSdYPw5Bxh+my4Z0lJU96ZDN7jbBzvmEn0FZx3RtU1C7VWl6NbDx94bwY3V5YsgwRzJPOgeY2Q/nLG8A==
 
-"@typescript-eslint/typescript-estree@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.58.0.tgz#ed233faa8e2f2a2e1357c3e7d553d6465a0ee59a"
-  integrity sha512-7vv5UWbHqew/dvs+D3e1RvLv1v2eeZ9txRHPnEEBUgSNLx5ghdzjHa0sgLWYVKssH+lYmV0JaWdoubo0ncGYLA==
+"@typescript-eslint/typescript-estree@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.59.1.tgz#4391fadf98a22c869c5b6522dbf4e491e53e351a"
+  integrity sha512-OUd+vJS05sSkOip+BkZ/2NS8RMxrAAJemsC6vU3kmfLyeaJT0TftHkV9mcx2107MmsBVXXexhVu4F0TZXyMl4g==
   dependencies:
-    "@typescript-eslint/project-service" "8.58.0"
-    "@typescript-eslint/tsconfig-utils" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/project-service" "8.59.1"
+    "@typescript-eslint/tsconfig-utils" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     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@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.58.0.tgz#21a74a7963b0d288b719a4121c7dd555adaab3c3"
-  integrity sha512-RfeSqcFeHMHlAWzt4TBjWOAtoW9lnsAGiP3GbaX9uVgTYYrMbVnGONEfUCiSss+xMHFl+eHZiipmA8WkQ7FuNA==
+"@typescript-eslint/utils@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.59.1.tgz#cf6204d69701bbbc5b150f98c18aeef0a42c10bd"
+  integrity sha512-3pIeoXhCeYH9FSCBI8P3iNwJlGuzPlYKkTlen2O9T1DSeeg8UG8jstq6BLk+Mda0qup7mgk4z4XL4OzRaxZ8LA==
   dependencies:
     "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
 
-"@typescript-eslint/visitor-keys@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.58.0.tgz#2abd55a4be70fd55967aceaba4330b9ba9f45189"
-  integrity sha512-XJ9UD9+bbDo4a4epraTwG3TsNPeiB9aShrUneAVXy8q4LuwowN+qu89/6ByLMINqvIMeI9H9hOHQtg/ijrYXzQ==
+"@typescript-eslint/visitor-keys@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.59.1.tgz#b5cba576287a3eeb0b400b62813189abcc3f976a"
+  integrity sha512-LdDNl6C5iJExcM0Yh0PwAIBb9PrSiCsWamF/JyEZawm3kFDnRoaq3LGE4bpyRao/fWeGKKyw7icx0YxrLFC5Cg==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
     eslint-visitor-keys "^5.0.0"
 
 "@ungap/structured-clone@^1.3.0":
@@ -1909,10 +1908,10 @@ doctrine@^2.1.0:
   dependencies:
     esutils "^2.0.2"
 
-dotenv@^17.3.1:
-  version "17.3.1"
-  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-17.3.1.tgz#2706f5b0165e45a1503348187b8468f87fe6aae2"
-  integrity sha512-IO8C/dzEb6O3F9/twg6ZLXz164a2fhTnEWb95H23Dm4OuN+92NmEAlTrupP9VW6Jm3sO26tQlqyvyi4CsnY9GA==
+dotenv@^17.4.2:
+  version "17.4.2"
+  resolved "https://registry.yarnpkg.com/dotenv/-/dotenv-17.4.2.tgz#c07e54a746e11eba021dd9e1047ced5afdc1c034"
+  integrity sha512-nI4U3TottKAcAD9LLud4Cb7b2QztQMUEfHbvhTH09bqXTxnSie8WnjPALV/WMCrJZ6UV/qHJ6L03OqO3LcdYZw==
 
 dunder-proto@^1.0.0, dunder-proto@^1.0.1:
   version "1.0.1"
@@ -2263,17 +2262,17 @@ 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@^10.1.0:
-  version "10.1.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.1.0.tgz#9ca98e654e642ab2e1af6d1e9d8613857ac341b4"
-  integrity sha512-S9jlY/ELKEUwwQnqWDO+f+m6sercqOPSqXM5Go94l7DOmxHVDgmSFGWEzeE/gwgTAr0W103BWt0QLe/7mabIvA==
+eslint@^10.2.1:
+  version "10.2.1"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.2.1.tgz#224b2a6caeb34473eddcf918762363e2e063222a"
+  integrity sha512-wiyGaKsDgqXvF40P8mDwiUp/KQjE1FdrIEJsM8PZ3XCiniTMXS3OHWWUe5FI5agoCnr8x4xPrTDZuxsBlNHl+Q==
   dependencies:
     "@eslint-community/eslint-utils" "^4.8.0"
     "@eslint-community/regexpp" "^4.12.2"
-    "@eslint/config-array" "^0.23.3"
-    "@eslint/config-helpers" "^0.5.3"
-    "@eslint/core" "^1.1.1"
-    "@eslint/plugin-kit" "^0.6.1"
+    "@eslint/config-array" "^0.23.5"
+    "@eslint/config-helpers" "^0.5.5"
+    "@eslint/core" "^1.2.1"
+    "@eslint/plugin-kit" "^0.7.1"
     "@humanfs/node" "^0.16.6"
     "@humanwhocodes/module-importer" "^1.0.1"
     "@humanwhocodes/retry" "^0.4.2"
@@ -2683,7 +2682,7 @@ graceful-fs@^4.2.11:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.11.tgz#4183e4e8bf08bb6e05bbb2f7d2e0c8f712ca40e3"
   integrity sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==
 
-handlebars@^4.7.8:
+handlebars@^4.7.9:
   version "4.7.9"
   resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.9.tgz#6f139082ab58dc4e5a0e51efe7db5ae890d56a0f"
   integrity sha512-4E71E0rpOaQuJR2A3xDZ+GM1HyWYv1clR58tC8emQNeQe3RH7MAzSbat+V0wG78LQBo6m6bzSG/L4pBuCsgnUQ==
@@ -3676,12 +3675,11 @@ keyv@^4.5.4:
     json-buffer "3.0.1"
 
 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.18"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.18.tgz#c691ad23614f0b46eaf07d982e0ac988e1f43880"
-  integrity sha512-3zuZUWffTHQ+73EAwnodADtf534VNEZUpXr9jC12qyG8/IQuJET7PRsCpTb9wX2lmBspakwLUpqpj3tNm/0bVA==
+  version "0.6.3"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.6.3.tgz#a3d8ad58d66a47d3697e3c69b2be3f6df5233190"
+  integrity sha512-pXrQ4/4myQvjFFOAUmt5pWRrLEZR20gzIJD7MNdUH+5/S5nLI4ZRBo/SYKC6coaYj9pYTfQdBIzcs+3kfJ5uDA==
   dependencies:
     p-queue "6.6.2"
-    uuid "10.0.0"
 
 leven@^3.1.0:
   version "3.1.0"
@@ -4130,10 +4128,10 @@ prettier-linter-helpers@^1.0.1:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^3.8.1:
-  version "3.8.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
-  integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==
+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==
 
 pretty-format@30.2.0, pretty-format@^30.0.0:
   version "30.2.0"
@@ -4287,7 +4285,7 @@ semver@^6.3.1:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
   integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==
 
-semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3:
+semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3, semver@^7.7.4:
   version "7.7.4"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.4.tgz#28464e36060e991fa7a11d0279d2d3f3b57a7e8a"
   integrity sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==
@@ -4623,18 +4621,18 @@ ts-api-utils@^2.5.0:
   resolved "https://registry.yarnpkg.com/ts-api-utils/-/ts-api-utils-2.5.0.tgz#4acd4a155e22734990a5ed1fe9e97f113bcb37c1"
   integrity sha512-OJ/ibxhPlqrMM0UiNHJ/0CKQkoKF243/AEmplt3qpRgkW8VG7IfOS41h7V8TjITqdByHzrjcS/2si+y4lIh8NA==
 
-ts-jest@^29.4.6:
-  version "29.4.6"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-29.4.6.tgz#51cb7c133f227396818b71297ad7409bb77106e9"
-  integrity sha512-fSpWtOO/1AjSNQguk43hb/JCo16oJDnMJf3CdEGNkqsEX3t0KX96xvyX1D7PfLCpVoKu4MfVrqUkFyblYoY4lA==
+ts-jest@^29.4.9:
+  version "29.4.9"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-29.4.9.tgz#47dc33d0f5c36bddcedd16afefae285e0b049d2d"
+  integrity sha512-LTb9496gYPMCqjeDLdPrKuXtncudeV1yRZnF4Wo5l3SFi0RYEnYRNgMrFIdg+FHvfzjCyQk1cLncWVqiSX+EvQ==
   dependencies:
     bs-logger "^0.2.6"
     fast-json-stable-stringify "^2.1.0"
-    handlebars "^4.7.8"
+    handlebars "^4.7.9"
     json5 "^2.2.3"
     lodash.memoize "^4.1.2"
     make-error "^1.3.6"
-    semver "^7.7.3"
+    semver "^7.7.4"
     type-fest "^4.41.0"
     yargs-parser "^21.1.1"
 
@@ -4849,16 +4847,11 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-uuid@10.0.0, uuid@^10.0.0:
+uuid@^10.0.0:
   version "10.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-10.0.0.tgz#5a95aa454e6e002725c79055fd42aaba30ca6294"
   integrity sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==
 
-uuid@^11.1.0:
-  version "11.1.0"
-  resolved "https://registry.yarnpkg.com/uuid/-/uuid-11.1.0.tgz#9549028be1753bb934fc96e2bca09bb4105ae912"
-  integrity sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==
-
 uuid@^13.0.0:
   version "13.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-13.0.0.tgz#263dc341b19b4d755eb8fe36b78d95a6b65707e8"

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

@@ -9,8 +9,8 @@
   },
   "dependencies": {
     "@js-monorepo-example/shared": "*",
-    "@langchain/core": "^1.1.38",
-    "@langchain/langgraph": "^1.2.6"
+    "@langchain/core": "^1.1.42",
+    "@langchain/langgraph": "^1.2.9"
   },
   "devDependencies": {
     "typescript": "^5.9.3"

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

@@ -17,18 +17,18 @@
     "lint": "eslint 'apps/**/*.ts' 'libs/**/*.ts'"
   },
   "devDependencies": {
-    "turbo": "^2.9.3",
+    "turbo": "^2.9.14",
     "typescript": "^5.9.3",
     "@tsconfig/recommended": "^1.0.13",
     "@eslint/eslintrc": "^3.3.5",
     "@eslint/js": "^10.0.1",
-    "eslint": "^10.1.0",
+    "eslint": "^10.2.1",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.27.5",
     "eslint-plugin-no-instanceof": "^1.0.1",
     "eslint-plugin-prettier": "^5.5.5",
-    "@typescript-eslint/eslint-plugin": "^8.58.0",
-    "@typescript-eslint/parser": "^8.58.0",
-    "prettier": "^3.8.1"
+    "@typescript-eslint/eslint-plugin": "^8.59.1",
+    "@typescript-eslint/parser": "^8.59.1",
+    "prettier": "^3.8.3"
   }
 }

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

@@ -19,26 +19,26 @@
   resolved "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.12.2.tgz#bccdf615bcf7b6e8db830ec0b8d21c9a25de597b"
   integrity sha512-EriSTlt5OC9/7SXkRSCAhfSxxoSUgBm33OH+IkwbdpgoqsSsUg7y3uh+IICI/Qg4BBWr3U2i39RpmycbxMq4ew==
 
-"@eslint/config-array@^0.23.3":
-  version "0.23.3"
-  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.23.3.tgz#3f4a93dd546169c09130cbd10f2415b13a20a219"
-  integrity sha512-j+eEWmB6YYLwcNOdlwQ6L2OsptI/LO6lNBuLIqe5R7RetD658HLoF+Mn7LzYmAWWNNzdC6cqP+L6r8ujeYXWLw==
+"@eslint/config-array@^0.23.5":
+  version "0.23.5"
+  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.23.5.tgz#56e86d243049195d8acc0c06a1b3dfdc3fa3de95"
+  integrity sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==
   dependencies:
-    "@eslint/object-schema" "^3.0.3"
+    "@eslint/object-schema" "^3.0.5"
     debug "^4.3.1"
     minimatch "^10.2.4"
 
-"@eslint/config-helpers@^0.5.3":
-  version "0.5.3"
-  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.5.3.tgz#721fe6bbb90d74b0c80d6ff2428e5bbcb002becb"
-  integrity sha512-lzGN0onllOZCGroKJmRwY6QcEHxbjBw1gwB8SgRSqK8YbbtEXMvKynsXc3553ckIEBxsbMBU7oOZXKIPGZNeZw==
+"@eslint/config-helpers@^0.5.5":
+  version "0.5.5"
+  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.5.5.tgz#ae16134e4792ac5fbdc533548a24ac1ea9f7f3ae"
+  integrity sha512-eIJYKTCECbP/nsKaaruF6LW967mtbQbsw4JTtSVkUQc9MneSkbrgPJAbKl9nWr0ZeowV8BfsarBmPpBzGelA2w==
   dependencies:
-    "@eslint/core" "^1.1.1"
+    "@eslint/core" "^1.2.1"
 
-"@eslint/core@^1.1.1":
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-1.1.1.tgz#450f3d2be2d463ccd51119544092256b4e88df32"
-  integrity sha512-QUPblTtE51/7/Zhfv8BDwO0qkkzQL7P/aWWbqcf4xWLEYn1oKjdO0gglQBB4GAsu7u6wjijbCmzsUTy6mnk6oQ==
+"@eslint/core@^1.2.1":
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-1.2.1.tgz#c1da7cd1b82fa8787f98b5629fb811848a1b63ce"
+  integrity sha512-MwcE1P+AZ4C6DWlpin/OmOA54mmIZ/+xZuJiQd4SyB29oAJjN30UW9wkKNptW2ctp4cEsvhlLY/CsQ1uoHDloQ==
   dependencies:
     "@types/json-schema" "^7.0.15"
 
@@ -62,17 +62,17 @@
   resolved "https://registry.yarnpkg.com/@eslint/js/-/js-10.0.1.tgz#1e8a876f50117af8ab67e47d5ad94d38d6622583"
   integrity sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==
 
-"@eslint/object-schema@^3.0.3":
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-3.0.3.tgz#5bf671e52e382e4adc47a9906f2699374637db6b"
-  integrity sha512-iM869Pugn9Nsxbh/YHRqYiqd23AmIbxJOcpUMOuWCVNdoQJ5ZtwL6h3t0bcZzJUlC3Dq9jCFCESBZnX0GTv7iQ==
+"@eslint/object-schema@^3.0.5":
+  version "3.0.5"
+  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-3.0.5.tgz#88e9bf4d11d2b19c082e78ebe7ce88724a5eb091"
+  integrity sha512-vqTaUEgxzm+YDSdElad6PiRoX4t8VGDjCtt05zn4nU810UIx/uNEV7/lZJ6KwFThKZOzOxzXy48da+No7HZaMw==
 
-"@eslint/plugin-kit@^0.6.1":
-  version "0.6.1"
-  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.6.1.tgz#eb9e6689b56ce8bc1855bb33090e63f3fc115e8e"
-  integrity sha512-iH1B076HoAshH1mLpHMgwdGeTs0CYwL0SPMkGuSebZrwBp16v415e9NZXg2jtrqPVQjf6IANe2Vtlr5KswtcZQ==
+"@eslint/plugin-kit@^0.7.1":
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.7.1.tgz#c4125fd015eceeb09b793109fdbcd4dd0a02d346"
+  integrity sha512-rZAP3aVgB9ds9KOeUSL+zZ21hPmo8dh6fnIFwRQj5EAZl9gzR7wxYbYXYysAM8CTqGmUGyp2S4kUdV17MnGuWQ==
   dependencies:
-    "@eslint/core" "^1.1.1"
+    "@eslint/core" "^1.2.1"
     levn "^0.4.1"
 
 "@humanfs/core@^0.19.1":
@@ -103,10 +103,10 @@
   resolved "https://registry.yarnpkg.com/@isaacs/cliui/-/cliui-9.0.0.tgz#4d0a3f127058043bf2e7ee169eaf30ed901302f3"
   integrity sha512-AokJm4tuBHillT+FpMtxQ60n8ObyXBatq7jD2/JA9dxbDDokKQm8KMht5ibGzLVU9IJDIKK4TPKgMHEYMn3lMg==
 
-"@langchain/core@^1.1.38":
-  version "1.1.38"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.38.tgz#b5939b2e77af408771c9bb95bf56a5ad8183313e"
-  integrity sha512-C340wH1YL10CiVOFlEpQMp0zQE85/eBLKX/gi1Lv7shAyUmR3CQ0t/mXlCd5RsZa6ntAN1kDJnp64ArWey9XAA==
+"@langchain/core@^1.1.42":
+  version "1.1.42"
+  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.42.tgz#607bfd34c1414c9cbeb2859fda1b254a14c28085"
+  integrity sha512-d0tN96BrwPMryYyWR9VfyAntSivn7EQrZCe5Kpxum93tcjTXbKKmKvItFec8AluQt88iTcmAJrahUZUNfzGwTA==
   dependencies:
     "@cfworker/json-schema" "^4.0.2"
     "@standard-schema/spec" "^1.1.0"
@@ -117,7 +117,6 @@
     langsmith ">=0.5.0 <1.0.0"
     mustache "^4.2.0"
     p-queue "^6.6.2"
-    uuid "^11.1.0"
     zod "^3.25.76 || ^4"
 
 "@langchain/langgraph-checkpoint@^1.0.1":
@@ -127,23 +126,23 @@
   dependencies:
     uuid "^10.0.0"
 
-"@langchain/langgraph-sdk@~1.8.1":
-  version "1.8.3"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.8.3.tgz#deedc9bddd863693c6ab5f3a74058548b040377d"
-  integrity sha512-Py0S5yVtlOHz410aEsSGLRKjtsK2giDvfPS1JjAjTdcs71khuJufFtUZFwmwdJCbsG4DaGurRLHOAJu9jO4a0g==
+"@langchain/langgraph-sdk@~1.8.9":
+  version "1.8.10"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.8.10.tgz#bd175cda1ab629845ef28b22b45f3bdd1f65b029"
+  integrity sha512-wrB3rkRw5KAmsqezwvKP3midT4qJrV6Hj9XJMYo+cbvXC4HYpSAmyY/VriSyeTFRbLG/OP/pY2Yz+9Z54nSaXQ==
   dependencies:
     "@types/json-schema" "^7.0.15"
     p-queue "^9.0.1"
     p-retry "^7.1.1"
     uuid "^13.0.0"
 
-"@langchain/langgraph@^1.2.6":
-  version "1.2.6"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.6.tgz#e6a578f96fbbc1c54ba78e0298884671dad5d195"
-  integrity sha512-5cX402dNGN6w9+0mlMU2dgUiKx6Y1tlENp7x05e9ByDbQCHSDc0kyqRWNFLGc7vatQ92S4ylxQrcCJvi8Fr4SQ==
+"@langchain/langgraph@^1.2.9":
+  version "1.2.9"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.9.tgz#4f0ba159062c3649c83cf5f621ef926b96933e32"
+  integrity sha512-3c7BtGycHC2v9p6w/Hv8L7kEl1YnZYOQTDJtmAp3knk6JOedO7d2bYP3y0SRyhv5orUEGf/KGvx8ZsB/ideP7g==
   dependencies:
     "@langchain/langgraph-checkpoint" "^1.0.1"
-    "@langchain/langgraph-sdk" "~1.8.1"
+    "@langchain/langgraph-sdk" "~1.8.9"
     "@standard-schema/spec" "1.1.0"
     uuid "^10.0.0"
 
@@ -167,35 +166,35 @@
   resolved "https://registry.yarnpkg.com/@tsconfig/recommended/-/recommended-1.0.13.tgz#269fce3ad04ca70b93269ff44cca81b950f542da"
   integrity sha512-sySRuBfMKyKO/j2ZAhR8kSembhjuPEV4Ra3AHtmWLq51+iGaudr45crPSzNC5b7/Ctrh9dfUpBuTlYrH6rM58Q==
 
-"@turbo/darwin-64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.9.3.tgz#5d782d341ddebc20822d09ba1393238d4467ae7b"
-  integrity sha512-P8foouaP+y/p+hhEGBoZpzMbpVvUMwPjDpcy6wN7EYfvvyISD1USuV27qWkczecihwuPJzQ1lDBuL8ERcavTyg==
+"@turbo/darwin-64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.9.14.tgz#b9ec6ac637b9c5fdba5dae9d743f5d121f091242"
+  integrity sha512-t7QiPflaEyBE4oayeZtSmu4mEfjgIrcNlNNl1z1dmIVPqEdtA7+CfTf8d7KXsOGPh6aNgWjKxyvQg9uGfDQF+A==
 
-"@turbo/darwin-arm64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.9.3.tgz#75cd662d9c2a572532ce82d7cae1a30e2497d693"
-  integrity sha512-SIzEkvtNdzdI50FJDaIQ6kQGqgSSdFPcdn0wqmmONN6iGKjy6hsT+EH99GP65FsfV7DLZTh2NmtTIRl2kdoz5Q==
+"@turbo/darwin-arm64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.9.14.tgz#99d19f3e59842c595d2828c72a2e4ef537408f38"
+  integrity sha512-d23147mC9BsCPA9mJ0h/ubcpbRgcJBXbcG3+Vq7YLhjz3IXuvQsJ1UXH8f4MD76ZjJ4m/E4aRdJV+MW88CDfbw==
 
-"@turbo/linux-64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.9.3.tgz#de693a996071654a0bea51c7ed9dc6fdc3950ae8"
-  integrity sha512-pLRwFmcHHNBvsCySLS6OFabr/07kDT2pxEt/k6eBf/3asiVQZKJ7Rk88AafQx2aYA641qek4RsXvYO3JYpiBug==
+"@turbo/linux-64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.9.14.tgz#9c907434f091cd75529f5496516f79b71935d2bb"
+  integrity sha512-P3ZKB5tuUDdDQWuAsACGUR1qv9W7BNWxdxqVJ0kZNuNNPRaVYTPPikLcp79+GiEcW3npsR+KyP38lnQiBc5aSA==
 
-"@turbo/linux-arm64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.9.3.tgz#88fc6fe572d83c5488eeae9b564b57c335f4d856"
-  integrity sha512-gy6ApUroC2Nzv+qjGtE/uPNkhHAFU4c8God+zd5Aiv9L9uBgHlxVJpHT3XWl5xwlJZ2KWuMrlHTaS5kmNB+q1Q==
+"@turbo/linux-arm64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.9.14.tgz#79ae9060e6ee9e0fb784ae0747e980f582e75313"
+  integrity sha512-ZRTlzcUMrrPv9ZuDzRF9n60Ym13bKeG9jDB8WjxyLhWNzV+AJQN+zdpIk3NJYf2zQsGUm1mNar2P0elRzLw25g==
 
-"@turbo/windows-64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.9.3.tgz#a7812e4f33972f74daed93b2ac8845f88a68c775"
-  integrity sha512-d0YelTX6hAsB7kIEtGB3PzIzSfAg3yDoUlHwuwJc3adBXUsyUIs0YLG+1NNtuhcDOUGnWQeKUoJ2pGWvbpRj7w==
+"@turbo/windows-64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.9.14.tgz#68a80f299f35189314184c88301caad982d1c0c2"
+  integrity sha512-exanwN6sIduZwykYeiTQj8kCmOhazP5WOz3bvXMcYtjhL6Z3iRWLewKrXCBq0bqwSP3iBMb/AerRCnHI4lx46A==
 
-"@turbo/windows-arm64@2.9.3":
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.9.3.tgz#1891a89fe87d501e63a7a4367082f3afec18fa6f"
-  integrity sha512-/08CwpKJl3oRY8nOlh2YgilZVJDHsr60XTNxRhuDeuFXONpUZ5X+Nv65izbG/xBew9qxcJFbDX9/sAmAX+ITcQ==
+"@turbo/windows-arm64@2.9.14":
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.9.14.tgz#4dc16684f0ddce53fafe56ad8f55205c4473d17a"
+  integrity sha512-fVdCsnmYoKICsycbWuuGp6Jvi51/3G/UluFWuAUCvR8PIW5IJkAk5BM9UF8PSm0Q2IphWHFZjYEgjHsh3B9y/g==
 
 "@types/esrecurse@^4.3.1":
   version "4.3.1"
@@ -217,100 +216,100 @@
   resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
   integrity sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==
 
-"@typescript-eslint/eslint-plugin@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.58.0.tgz#ad40e492f1931f46da1bd888e52b9e56df9063aa"
-  integrity sha512-RLkVSiNuUP1C2ROIWfqX+YcUfLaSnxGE/8M+Y57lopVwg9VTYYfhuz15Yf1IzCKgZj6/rIbYTmJCUSqr76r0Wg==
+"@typescript-eslint/eslint-plugin@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.59.1.tgz#781bc6f9002982cfaf75a185240e24ad7276628a"
+  integrity sha512-BOziFIfE+6osHO9FoJG4zjoHUcvI7fTNBSpdAwrNH0/TLvzjsk2oo8XSSOT2HhqUyhZPfHv4UOffoJ9oEEQ7Ag==
   dependencies:
     "@eslint-community/regexpp" "^4.12.2"
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/type-utils" "8.58.0"
-    "@typescript-eslint/utils" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/type-utils" "8.59.1"
+    "@typescript-eslint/utils" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     ignore "^7.0.5"
     natural-compare "^1.4.0"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/parser@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.58.0.tgz#da04ece1967b6c2fe8f10c3473dabf3825795ef7"
-  integrity sha512-rLoGZIf9afaRBYsPUMtvkDWykwXwUPL60HebR4JgTI8mxfFe2cQTu3AGitANp4b9B2QlVru6WzjgB2IzJKiCSA==
+"@typescript-eslint/parser@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.59.1.tgz#835d20a62350659a082a1ae2a60b822c40488905"
+  integrity sha512-HDQH9O/47Dxi1ceDhBXdaldtf/WV9yRYMjbjCuNk3qnaTD564qwv61Y7+gTxwxRKzSrgO5uhtw584igXVuuZkA==
   dependencies:
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     debug "^4.4.3"
 
-"@typescript-eslint/project-service@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.58.0.tgz#66ceda0aabf7427aec3e2713fa43eb278dead2aa"
-  integrity sha512-8Q/wBPWLQP1j16NxoPNIKpDZFMaxl7yWIoqXWYeWO+Bbd2mjgvoF0dxP2jKZg5+x49rgKdf7Ck473M8PC3V9lg==
+"@typescript-eslint/project-service@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.59.1.tgz#49efe87c37ef84262f23df8bf62fdc56698ca6fe"
+  integrity sha512-+MuHQlHiEr00Of/IQbE/MmEoi44znZHbR/Pz7Opq4HryUOlRi+/44dro9Ycy8Fyo+/024IWtw8m4JUMCGTYxDg==
   dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.58.0"
-    "@typescript-eslint/types" "^8.58.0"
+    "@typescript-eslint/tsconfig-utils" "^8.59.1"
+    "@typescript-eslint/types" "^8.59.1"
     debug "^4.4.3"
 
-"@typescript-eslint/scope-manager@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.58.0.tgz#e304142775e49a1b7ac3c8bf2536714447c72cab"
-  integrity sha512-W1Lur1oF50FxSnNdGp3Vs6P+yBRSmZiw4IIjEeYxd8UQJwhUF0gDgDD/W/Tgmh73mxgEU3qX0Bzdl/NGuSPEpQ==
+"@typescript-eslint/scope-manager@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.59.1.tgz#ed90d054fc3db2d0c81464db3a953a94fb85bb58"
+  integrity sha512-LwuHQI4pDOYVKvmH2dkaJo6YZCSgouVgnS/z7yBPKBMvgtBvyLqiLy9Z6b7+m/TRcX1NFYUqZetI5Y+aT4GEfg==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
 
-"@typescript-eslint/tsconfig-utils@8.58.0", "@typescript-eslint/tsconfig-utils@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.58.0.tgz#c5a8edb21f31e0fdee565724e1b984171c559482"
-  integrity sha512-doNSZEVJsWEu4htiVC+PR6NpM+pa+a4ClH9INRWOWCUzMst/VA9c4gXq92F8GUD1rwhNvRLkgjfYtFXegXQF7A==
+"@typescript-eslint/tsconfig-utils@8.59.1", "@typescript-eslint/tsconfig-utils@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.59.1.tgz#ba2a779a444f1d5cb92a606f9b209d239fd4cab1"
+  integrity sha512-/0nEyPbX7gRsk0Uwfe4ALwwgxuA66d/l2mhRDNlAvaj4U3juhUtJNq0DsY8M2AYwwb9rEq2hrC3IcIcEt++iJA==
 
-"@typescript-eslint/type-utils@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.58.0.tgz#ce0e72cd967ffbbe8de322db6089bd4374be352f"
-  integrity sha512-aGsCQImkDIqMyx1u4PrVlbi/krmDsQUs4zAcCV6M7yPcPev+RqVlndsJy9kJ8TLihW9TZ0kbDAzctpLn5o+lOg==
+"@typescript-eslint/type-utils@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.59.1.tgz#9c83d3f2ed9187a815e8120f72c08317e513e409"
+  integrity sha512-klWPBR2ciQHS3f++ug/mVnWKPjBUo7icEL3FAO1lhAR1Z1i5NQYZ1EannMSRYcq5qCv5wNALlXr6fksRHyYl7w==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
-    "@typescript-eslint/utils" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/utils" "8.59.1"
     debug "^4.4.3"
     ts-api-utils "^2.5.0"
 
-"@typescript-eslint/types@8.58.0", "@typescript-eslint/types@^8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.58.0.tgz#e94ae7abdc1c6530e71183c1007b61fa93112a5a"
-  integrity sha512-O9CjxypDT89fbHxRfETNoAnHj/i6IpRK0CvbVN3qibxlLdo5p5hcLmUuCCrHMpxiWSwKyI8mCP7qRNYuOJ0Uww==
+"@typescript-eslint/types@8.59.1", "@typescript-eslint/types@^8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.59.1.tgz#c1d014d3f03a97e0113a8899fc9d4e45a7fb0ca9"
+  integrity sha512-ZDCjgccSdYPw5Bxh+my4Z0lJU96ZDN7jbBzvmEn0FZx3RtU1C7VWl6NbDx94bwY3V5YsgwRzJPOgeY2Q/nLG8A==
 
-"@typescript-eslint/typescript-estree@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.58.0.tgz#ed233faa8e2f2a2e1357c3e7d553d6465a0ee59a"
-  integrity sha512-7vv5UWbHqew/dvs+D3e1RvLv1v2eeZ9txRHPnEEBUgSNLx5ghdzjHa0sgLWYVKssH+lYmV0JaWdoubo0ncGYLA==
+"@typescript-eslint/typescript-estree@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.59.1.tgz#4391fadf98a22c869c5b6522dbf4e491e53e351a"
+  integrity sha512-OUd+vJS05sSkOip+BkZ/2NS8RMxrAAJemsC6vU3kmfLyeaJT0TftHkV9mcx2107MmsBVXXexhVu4F0TZXyMl4g==
   dependencies:
-    "@typescript-eslint/project-service" "8.58.0"
-    "@typescript-eslint/tsconfig-utils" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/visitor-keys" "8.58.0"
+    "@typescript-eslint/project-service" "8.59.1"
+    "@typescript-eslint/tsconfig-utils" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/visitor-keys" "8.59.1"
     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@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.58.0.tgz#21a74a7963b0d288b719a4121c7dd555adaab3c3"
-  integrity sha512-RfeSqcFeHMHlAWzt4TBjWOAtoW9lnsAGiP3GbaX9uVgTYYrMbVnGONEfUCiSss+xMHFl+eHZiipmA8WkQ7FuNA==
+"@typescript-eslint/utils@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.59.1.tgz#cf6204d69701bbbc5b150f98c18aeef0a42c10bd"
+  integrity sha512-3pIeoXhCeYH9FSCBI8P3iNwJlGuzPlYKkTlen2O9T1DSeeg8UG8jstq6BLk+Mda0qup7mgk4z4XL4OzRaxZ8LA==
   dependencies:
     "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.58.0"
-    "@typescript-eslint/types" "8.58.0"
-    "@typescript-eslint/typescript-estree" "8.58.0"
+    "@typescript-eslint/scope-manager" "8.59.1"
+    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/typescript-estree" "8.59.1"
 
-"@typescript-eslint/visitor-keys@8.58.0":
-  version "8.58.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.58.0.tgz#2abd55a4be70fd55967aceaba4330b9ba9f45189"
-  integrity sha512-XJ9UD9+bbDo4a4epraTwG3TsNPeiB9aShrUneAVXy8q4LuwowN+qu89/6ByLMINqvIMeI9H9hOHQtg/ijrYXzQ==
+"@typescript-eslint/visitor-keys@8.59.1":
+  version "8.59.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.59.1.tgz#b5cba576287a3eeb0b400b62813189abcc3f976a"
+  integrity sha512-LdDNl6C5iJExcM0Yh0PwAIBb9PrSiCsWamF/JyEZawm3kFDnRoaq3LGE4bpyRao/fWeGKKyw7icx0YxrLFC5Cg==
   dependencies:
-    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/types" "8.59.1"
     eslint-visitor-keys "^5.0.0"
 
 acorn-jsx@^5.3.2:
@@ -787,17 +786,17 @@ 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@^10.1.0:
-  version "10.1.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.1.0.tgz#9ca98e654e642ab2e1af6d1e9d8613857ac341b4"
-  integrity sha512-S9jlY/ELKEUwwQnqWDO+f+m6sercqOPSqXM5Go94l7DOmxHVDgmSFGWEzeE/gwgTAr0W103BWt0QLe/7mabIvA==
+eslint@^10.2.1:
+  version "10.2.1"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.2.1.tgz#224b2a6caeb34473eddcf918762363e2e063222a"
+  integrity sha512-wiyGaKsDgqXvF40P8mDwiUp/KQjE1FdrIEJsM8PZ3XCiniTMXS3OHWWUe5FI5agoCnr8x4xPrTDZuxsBlNHl+Q==
   dependencies:
     "@eslint-community/eslint-utils" "^4.8.0"
     "@eslint-community/regexpp" "^4.12.2"
-    "@eslint/config-array" "^0.23.3"
-    "@eslint/config-helpers" "^0.5.3"
-    "@eslint/core" "^1.1.1"
-    "@eslint/plugin-kit" "^0.6.1"
+    "@eslint/config-array" "^0.23.5"
+    "@eslint/config-helpers" "^0.5.5"
+    "@eslint/core" "^1.2.1"
+    "@eslint/plugin-kit" "^0.7.1"
     "@humanfs/node" "^0.16.6"
     "@humanwhocodes/module-importer" "^1.0.1"
     "@humanwhocodes/retry" "^0.4.2"
@@ -1328,12 +1327,11 @@ keyv@^4.5.4:
     json-buffer "3.0.1"
 
 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.18"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.18.tgz#c691ad23614f0b46eaf07d982e0ac988e1f43880"
-  integrity sha512-3zuZUWffTHQ+73EAwnodADtf534VNEZUpXr9jC12qyG8/IQuJET7PRsCpTb9wX2lmBspakwLUpqpj3tNm/0bVA==
+  version "0.7.1"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.7.1.tgz#d721ad2e5211f9a5373e8a84eb4fed36b5621971"
+  integrity sha512-Wjk90UjNoY5cBHMlNAC/eZx5clI8jnjBOBW8uJu8+MWBtx0QesNjsUiLtjI+I3UnrpxFFpDqGXcnhBjH654Mqg==
   dependencies:
     p-queue "6.6.2"
-    uuid "10.0.0"
 
 levn@^0.4.1:
   version "0.4.1"
@@ -1559,10 +1557,10 @@ prettier-linter-helpers@^1.0.1:
   dependencies:
     fast-diff "^1.1.2"
 
-prettier@^3.8.1:
-  version "3.8.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
-  integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==
+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==
 
 punycode@^2.1.0:
   version "2.3.1"
@@ -1815,17 +1813,17 @@ tsconfig-paths@^3.15.0:
     minimist "^1.2.6"
     strip-bom "^3.0.0"
 
-turbo@^2.9.3:
-  version "2.9.3"
-  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.9.3.tgz#4f0adf2c8677edd7b46d400629c99e9e26e58e44"
-  integrity sha512-J/VUvsGRykPb9R8Kh8dHVBOqioDexLk9BhLCU/ZybRR+HN9UR3cURdazFvNgMDt9zPP8TF6K73Z+tplfmi0PqQ==
+turbo@^2.9.14:
+  version "2.9.14"
+  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.9.14.tgz#d412fcc4c9bd8dba29cec5bbd54d5a74ab2b1bee"
+  integrity sha512-BQqXRr4UoWI3UPFrtznCLykYHxwxWh53iCB57x092jPMjIlW1wnm3N895g5irpiXmnxUhREBB0n6+y8BHhs4nw==
   optionalDependencies:
-    "@turbo/darwin-64" "2.9.3"
-    "@turbo/darwin-arm64" "2.9.3"
-    "@turbo/linux-64" "2.9.3"
-    "@turbo/linux-arm64" "2.9.3"
-    "@turbo/windows-64" "2.9.3"
-    "@turbo/windows-arm64" "2.9.3"
+    "@turbo/darwin-64" "2.9.14"
+    "@turbo/darwin-arm64" "2.9.14"
+    "@turbo/linux-64" "2.9.14"
+    "@turbo/linux-arm64" "2.9.14"
+    "@turbo/windows-64" "2.9.14"
+    "@turbo/windows-arm64" "2.9.14"
 
 type-check@^0.4.0, type-check@~0.4.0:
   version "0.4.0"
@@ -1901,16 +1899,11 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
-uuid@10.0.0, uuid@^10.0.0:
+uuid@^10.0.0:
   version "10.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-10.0.0.tgz#5a95aa454e6e002725c79055fd42aaba30ca6294"
   integrity sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==
 
-uuid@^11.1.0:
-  version "11.1.0"
-  resolved "https://registry.yarnpkg.com/uuid/-/uuid-11.1.0.tgz#9549028be1753bb934fc96e2bca09bb4105ae912"
-  integrity sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==
-
 uuid@^13.0.0:
   version "13.0.0"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-13.0.0.tgz#263dc341b19b4d755eb8fe36b78d95a6b65707e8"

libs/cli/langgraph_cli/__init__.py

@@ -1 +1 @@
-__version__ = "0.4.21"
+__version__ = "0.4.27"

libs/cli/langgraph_cli/_ignore.py

@@ -0,0 +1,124 @@
+"""Shared ignore-file handling for local source filtering."""
+
+import pathlib
+from dataclasses import dataclass
+
+import pathspec
+
+_ALWAYS_EXCLUDE = [
+    "__pycache__/",
+    ".git/",
+    ".venv/",
+    "venv/",
+    "node_modules/",
+    ".tox/",
+    ".mypy_cache/",
+]
+_ALWAYS_EXCLUDE_NAMES = frozenset(
+    pattern.rstrip("/").split("/")[-1] for pattern in _ALWAYS_EXCLUDE
+)
+_GLOB_CHARS = frozenset("*?[")
+
+
+@dataclass(frozen=True, slots=True)
+class _NegatedDockerignoreHints:
+    exact_dirs: frozenset[pathlib.PurePosixPath] = frozenset()
+    wildcard_prefixes: frozenset[pathlib.PurePosixPath] = frozenset()
+    recurse_all: bool = False
+
+    def requires_dir_walk(self, path: pathlib.PurePosixPath) -> bool:
+        if self.recurse_all or path in self.exact_dirs:
+            return True
+        return any(
+            path == prefix or path in prefix.parents or prefix in path.parents
+            for prefix in self.wildcard_prefixes
+        )
+
+
+def _build_ignore_spec(
+    directory: pathlib.Path, *, include_gitignore: bool = True
+) -> pathspec.PathSpec:
+    """Build a PathSpec combining built-in exclusions with ignore files.
+
+    Always excludes common non-source directories (`_ALWAYS_EXCLUDE`). On top
+    of that, patterns from `.dockerignore` are merged in. `.gitignore` patterns
+    are optional because some callers need Docker build-context semantics,
+    while archive creation wants both files.
+    """
+    lines: list[str] = list(_ALWAYS_EXCLUDE)
+    ignore_files = [".dockerignore"]
+    if include_gitignore:
+        ignore_files.append(".gitignore")
+    for name in ignore_files:
+        ignore_file = directory / name
+        if ignore_file.is_file():
+            lines.extend(ignore_file.read_text(encoding="utf-8").splitlines())
+    return pathspec.PathSpec.from_lines("gitwildmatch", lines)
+
+
+def _is_always_excluded(path: pathlib.PurePosixPath, *, is_dir: bool) -> bool:
+    """Whether `path` lives inside a built-in excluded directory."""
+    parent_parts = path.parts if is_dir else path.parts[:-1]
+    return any(part in _ALWAYS_EXCLUDE_NAMES for part in parent_parts)
+
+
+def _build_dockerignore_negation_hints(
+    directory: pathlib.Path,
+) -> _NegatedDockerignoreHints:
+    """Summarize which ignored directories must still be traversed.
+
+    Most negations only require walking a small, concrete chain of parent
+    directories (for example `!assets/keep.txt` requires entering `assets/`).
+    Broader glob negations may force a wider walk.
+    """
+    ignore_file = directory / ".dockerignore"
+    if not ignore_file.is_file():
+        return _NegatedDockerignoreHints()
+
+    exact_dirs: set[pathlib.PurePosixPath] = set()
+    wildcard_prefixes: set[pathlib.PurePosixPath] = set()
+    recurse_all = False
+
+    for raw_line in ignore_file.read_text(encoding="utf-8").splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith("#") or line.startswith("\\!"):
+            continue
+        if line.startswith("\\#"):
+            line = line[1:]
+        if not line.startswith("!"):
+            continue
+
+        pattern = line[1:].lstrip("/")
+        while pattern.startswith("./"):
+            pattern = pattern[2:]
+        pattern = pattern.rstrip("/")
+        parts = [part for part in pattern.split("/") if part and part != "."]
+        if not parts:
+            recurse_all = True
+            continue
+
+        wildcard_index = next(
+            (
+                idx
+                for idx, part in enumerate(parts)
+                if any(char in part for char in _GLOB_CHARS)
+            ),
+            None,
+        )
+        if wildcard_index is not None:
+            literal_parts = parts[:wildcard_index]
+            if not literal_parts:
+                recurse_all = True
+                continue
+            wildcard_prefixes.add(pathlib.PurePosixPath(*literal_parts))
+            continue
+
+        parent_parts = parts[:-1]
+        for idx in range(1, len(parent_parts) + 1):
+            exact_dirs.add(pathlib.PurePosixPath(*parent_parts[:idx]))
+
+    return _NegatedDockerignoreHints(
+        exact_dirs=frozenset(exact_dirs),
+        wildcard_prefixes=frozenset(wildcard_prefixes),
+        recurse_all=recurse_all,
+    )

libs/cli/langgraph_cli/analytics.py

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

libs/cli/langgraph_cli/archive.py

@@ -9,35 +9,12 @@ from contextlib import contextmanager
 import click
 import pathspec
 
+from langgraph_cli._ignore import _build_ignore_spec
 from langgraph_cli.config import Config, _assemble_local_deps
 
 _WARN_SIZE = 50 * 1024 * 1024  # 50 MB
 _MAX_SIZE = 200 * 1024 * 1024  # 200 MB
 
-_ALWAYS_EXCLUDE = [
-    "__pycache__/",
-    ".git/",
-    ".venv/",
-    "venv/",
-    "node_modules/",
-    ".tox/",
-    ".mypy_cache/",
-]
-
-
-def _build_ignore_spec(directory: pathlib.Path) -> pathspec.PathSpec:
-    """Build a PathSpec combining built-in exclusions with .dockerignore and .gitignore.
-
-    Always excludes common non-source directories (_ALWAYS_EXCLUDE).  On top of
-    that, patterns from .dockerignore and .gitignore (if present) are merged in.
-    """
-    lines: list[str] = list(_ALWAYS_EXCLUDE)
-    for name in (".dockerignore", ".gitignore"):
-        ignore_file = directory / name
-        if ignore_file.is_file():
-            lines.extend(ignore_file.read_text(encoding="utf-8").splitlines())
-    return pathspec.PathSpec.from_lines("gitwildmatch", lines)
-
 
 def _tar_filter(tarinfo: tarfile.TarInfo) -> tarfile.TarInfo | None:
     """Strip symlinks, hardlinks, and traversal paths from archive."""

libs/cli/langgraph_cli/config.py

@@ -35,6 +35,12 @@ DISALLOWED_BUILD_COMMAND_CHARS = [
 # This blocks background execution (cmd &) while allowing command
 # chaining (cmd1 && cmd2) which is common in build commands.
 _SINGLE_AMPERSAND_RE = re.compile(r"(?<!&)&(?:&&)*(?!&)")
+_API_VERSION_PATTERN = re.compile(
+    r"^(?P<major>\d+)"
+    r"(?:\.(?P<minor>\d+))?"
+    r"(?:\.(?P<patch>\d+))?"
+    r"(?:(?:\.|)(?:[A-Za-z][0-9A-Za-z]*))?$"
+)
 
 
 def has_disallowed_build_command_content(command: str) -> bool:
@@ -123,6 +129,18 @@ def _parse_node_version(version_str: str) -> int:
         ) from None
 
 
+def _parse_api_version_parts(version_str: str) -> tuple[int, ...]:
+    """Parse an API version into numeric components.
+
+    Supports optional prerelease suffixes, e.g. `0.9.0rc1`.
+    """
+    version_core = version_str.split("-", 1)[0]
+    match = _API_VERSION_PATTERN.fullmatch(version_core)
+    if not match:
+        raise ValueError("Version must be major or major.minor or major.minor.patch.")
+    return tuple(int(part) for part in match.groups() if part is not None)
+
+
 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):
@@ -176,12 +194,12 @@ def validate_config(config: Config) -> Config:
             )
     if api_version:
         try:
-            parts = tuple(map(int, api_version.split("-")[0].split(".")))
+            parts = _parse_api_version_parts(api_version)
             if len(parts) > 3:
                 raise ValueError(
                     "Version must be major or major.minor or major.minor.patch."
                 )
-        except TypeError:
+        except (TypeError, ValueError):
             raise click.UsageError(
                 f"Invalid version format: {api_version}.\n\n"
                 "Pin to a minor version, e.g.:\n"

libs/cli/langgraph_cli/dependency_tracking.py

@@ -0,0 +1,141 @@
+"""Detection of tracked Python packages in a local LangGraph project.
+
+Mirrors host-backend's `host.models.dependency_tracking` so that CLI-based
+deploys report the same `tracked_packages` revision metadata that
+GitHub-based deploys do. The host backend strictly validates each entry
+against `<package-name>:<version>` with package-name in `TRACKED_PACKAGES`,
+so the detection rules here must match exactly.
+"""
+
+from __future__ import annotations
+
+import pathlib
+import re
+
+# Single source of truth for which packages the host backend cares about.
+# Keep in sync with host-backend/host/models/tracked_packages.py.
+TRACKED_PACKAGES: tuple[str, ...] = ("google-adk",)
+
+_MAX_READ_BYTES = 5 * 1024 * 1024
+
+_PACKAGES_ALT = "|".join(re.escape(p) for p in TRACKED_PACKAGES)
+
+_DEPS_RE = re.compile(
+    rf"(?<![a-zA-Z0-9_-])({_PACKAGES_ALT})"
+    r"(?:\[[^\]]*\])?"
+    r"\s*((?:(?:==|>=|<=|~=|!=|>|<)\s*[\w.*]+\s*,?\s*)+)"
+)
+
+_UV_LOCK_RE = re.compile(
+    rf'name\s*=\s*"({_PACKAGES_ALT})"\s*\n\s*version\s*=\s*"([^"]+)"'
+)
+
+_BARE_RE = re.compile(rf'(?<![a-zA-Z0-9_-])({_PACKAGES_ALT})(?:\[[^\]]*\])?\s*[,"\'\n]')
+
+_EXTRAS_BRACKET_RE = re.compile(r"\[([a-zA-Z0-9_.\- ,\t]+)\]")
+
+
+def _appears_in_extras(content: str, pkg: str) -> bool:
+    for m in _EXTRAS_BRACKET_RE.finditer(content):
+        for token in m.group(1).split(","):
+            if token.strip() == pkg:
+                return True
+    return False
+
+
+def _read_text(path: pathlib.Path) -> str | None:
+    try:
+        if not path.is_file():
+            return None
+        with open(path, "rb") as f:
+            data = f.read(_MAX_READ_BYTES + 1)
+    except OSError:
+        return None
+    if len(data) > _MAX_READ_BYTES:
+        data = data[:_MAX_READ_BYTES]
+    return data.decode("utf-8", errors="replace")
+
+
+def _find_version_for(
+    pkg: str,
+    lock_content: str | None,
+    pyproject_content: str | None,
+    requirements_content: str | None,
+) -> str | None:
+    if lock_content is not None:
+        for m in _UV_LOCK_RE.finditer(lock_content):
+            if m.group(1) == pkg:
+                return m.group(2)
+    for content in (pyproject_content, requirements_content):
+        if content is None:
+            continue
+        for m in _DEPS_RE.finditer(content):
+            if m.group(1) == pkg:
+                return m.group(2).strip().rstrip(",")
+        for m in _BARE_RE.finditer(content):
+            if m.group(1) == pkg:
+                return "unknown"
+        if _appears_in_extras(content, pkg):
+            return "unknown"
+    return None
+
+
+def _resolved_dep_base(
+    project_root: pathlib.Path, dep_path: str
+) -> pathlib.Path | None:
+    """Return the resolved dep directory if it stays inside the project root."""
+    try:
+        candidate = (project_root / dep_path).resolve()
+    except (OSError, RuntimeError):
+        return None
+    try:
+        candidate.relative_to(project_root)
+    except ValueError:
+        return None
+    return candidate
+
+
+def find_tracked_packages(
+    config: pathlib.Path,
+    config_json: dict,
+) -> list[str]:
+    """Return every tracked package found in deps as `<name>:<version>` entries.
+
+    `config` is the absolute path to `langgraph.json`; dep paths in
+    `config_json["dependencies"]` are resolved relative to its parent.
+    Detection precedence per package: uv.lock resolved > pyproject.toml /
+    requirements.txt specifier > bare reference > extras bracket (last
+    two recorded as "unknown"). Output is ordered by `TRACKED_PACKAGES`.
+    """
+    try:
+        project_root = config.parent.resolve()
+    except (OSError, RuntimeError):
+        return []
+
+    dep_paths = config_json.get("dependencies") or ["."]
+
+    found: dict[str, str] = {}
+
+    for dep_path in dep_paths:
+        if all(pkg in found for pkg in TRACKED_PACKAGES):
+            break
+        if not isinstance(dep_path, str):
+            continue
+        base = _resolved_dep_base(project_root, dep_path)
+        if base is None or not base.is_dir():
+            continue
+
+        lock_content = _read_text(base / "uv.lock")
+        pyproject_content = _read_text(base / "pyproject.toml")
+        requirements_content = _read_text(base / "requirements.txt")
+
+        for pkg in TRACKED_PACKAGES:
+            if pkg in found:
+                continue
+            version = _find_version_for(
+                pkg, lock_content, pyproject_content, requirements_content
+            )
+            if version is not None:
+                found[pkg] = version
+
+    return [f"{pkg}:{found[pkg]}" for pkg in TRACKED_PACKAGES if pkg in found]

libs/cli/langgraph_cli/deploy.py

@@ -20,6 +20,7 @@ from dotenv import dotenv_values, set_key
 import langgraph_cli.config
 from langgraph_cli.analytics import log_command
 from langgraph_cli.constants import DEFAULT_CONFIG
+from langgraph_cli.dependency_tracking import find_tracked_packages
 from langgraph_cli.docker import build_docker_image, can_build_locally
 from langgraph_cli.exec import Runner, subp_exec
 from langgraph_cli.host_backend import HostBackendClient, HostBackendError
@@ -115,6 +116,172 @@ class BuildResult:
     show_build_logs_on_failure: bool = False
 
 
+# ---------------------------------------------------------------------------
+# Structured output emitter
+# ---------------------------------------------------------------------------
+
+_emitter: "_Emitter | None" = None
+_no_input: bool = False
+
+
+class _Emitter:
+    """Dual-mode output: JSON-lines (``--json``) or human-readable click text."""
+
+    def __init__(self, json_mode: bool) -> None:
+        self._json = json_mode
+
+    @property
+    def json_mode(self) -> bool:
+        return self._json
+
+    # -- Structured event helpers ------------------------------------------
+
+    def step(self, step: int, message: str, **extra: object) -> None:
+        if self._json:
+            self._write({"event": "step", "step": step, "message": message, **extra})
+        else:
+            click.secho(f"{step}. {message}", fg="cyan")
+
+    def info(self, message: str, **extra: object) -> None:
+        if self._json:
+            self._write({"event": "info", "message": message, **extra})
+        else:
+            click.secho(f"   {message}", fg="green")
+
+    def warn(self, message: str, **extra: object) -> None:
+        """Warning nested under a step. Text mode indents; JSON mode strips leading whitespace."""
+        if self._json:
+            self._write({"event": "warn", "message": message.lstrip(), **extra})
+        else:
+            click.secho(f"   {message}", fg="yellow")
+
+    def note(self, message: str, **extra: object) -> None:
+        """Top-level banner (pre-step). Text mode does not indent."""
+        if self._json:
+            self._write({"event": "note", "message": message, **extra})
+        else:
+            click.secho(message, fg="yellow")
+
+    def error(self, message: str, **extra: object) -> None:
+        if self._json:
+            self._write({"event": "error", "message": message, **extra})
+        else:
+            click.secho(f"   {message}", fg="red")
+
+    def status_change(
+        self,
+        status: str,
+        elapsed_seconds: float,
+        finished: bool = False,
+    ) -> None:
+        mins, secs = divmod(int(elapsed_seconds), 60)
+        elapsed_str = f"{mins}m {secs:02d}s" if mins else f"{secs}s"
+        if self._json:
+            self._write(
+                {
+                    "event": "status_change",
+                    "status": status,
+                    "elapsed_seconds": round(elapsed_seconds, 1),
+                    "message": f"{status}... ({elapsed_str})",
+                }
+            )
+        else:
+            click.echo(f"   {status}... ({elapsed_str})")
+
+    def log(self, message: str) -> None:
+        if self._json:
+            self._write({"event": "log", "message": message})
+        else:
+            click.echo(f"   | {message}")
+
+    def status_url(self, url: str) -> None:
+        if self._json:
+            self._write({"event": "status_url", "url": url})
+        else:
+            click.secho(f"   View status: {url}", fg="cyan")
+
+    def result(
+        self,
+        status: str,
+        *,
+        deployment_id: str,
+        url: str | None = None,
+        status_url: str | None = None,
+        fallback_status_message: str | None = None,
+    ) -> None:
+        if self._json:
+            if status == "succeeded":
+                message = "Deployment successful!"
+            elif status == "failed":
+                message = "Deployment failed"
+            else:
+                message = "Timed out waiting for deployment."
+            payload: dict = {
+                "event": "result",
+                "status": status,
+                "deployment_id": deployment_id,
+                "message": message,
+            }
+            if url:
+                payload["url"] = url
+            if status_url:
+                payload["status_url"] = status_url
+            self._write(payload)
+        else:
+            if status == "succeeded":
+                click.secho("   Deployment successful!", fg="green")
+                if url:
+                    click.secho(f"   URL: {url}", fg="green")
+                if status_url:
+                    click.secho(f"   View status: {status_url}", fg="green")
+            elif status == "failed":
+                click.secho("   Deployment failed", fg="red")
+                if status_url:
+                    click.secho(f"   View status: {status_url}", fg="red")
+            elif status == "timed_out":
+                click.secho("   Timed out waiting for deployment.", fg="yellow")
+                if status_url:
+                    click.secho(f"   Check status at: {status_url}", fg="yellow")
+                elif fallback_status_message:
+                    click.secho(f"   {fallback_status_message}", fg="yellow")
+
+    def heartbeat(self, status: str, elapsed_seconds: float) -> None:
+        if self._json:
+            mins, secs = divmod(int(elapsed_seconds), 60)
+            elapsed_str = f"{mins}m {secs:02d}s" if mins else f"{secs}s"
+            self._write(
+                {
+                    "event": "heartbeat",
+                    "status": status,
+                    "elapsed_seconds": round(elapsed_seconds, 1),
+                    "message": f"{status}... ({elapsed_str})",
+                }
+            )
+
+    def upload_progress(self, size_mb: float, pct: int) -> None:
+        if self._json:
+            self._write(
+                {
+                    "event": "upload_progress",
+                    "size_mb": round(size_mb, 1),
+                    "pct": pct,
+                }
+            )
+        else:
+            click.echo(f"\r   Uploading ({size_mb:.1f} MB)... {pct}%", nl=False)
+
+    def _write(self, obj: dict) -> None:
+        import sys as _sys
+
+        _sys.stdout.write(json_mod.dumps(obj, default=str) + "\n")
+        _sys.stdout.flush()
+
+
+def _get_emitter() -> _Emitter:
+    """Return the module-level emitter (falls back to text mode)."""
+    return _emitter or _Emitter(json_mode=False)
+
+
 # ---------------------------------------------------------------------------
 # Validators
 # ---------------------------------------------------------------------------
@@ -172,15 +339,16 @@ def find_deployment_id_by_name(
 # ---------------------------------------------------------------------------
 
 
-def normalize_image_name(value: str | None) -> str:
-    """Sanitize a deployment/directory name into a valid Docker repository name.
+def normalize_name(value: str | None) -> str:
+    """Sanitize a deployment/directory name into a valid deployment name.
 
-    Docker repository names must be lowercase and may only contain
-    [a-z0-9._-].  Invalid characters are replaced with hyphens.
+    LangSmith Deployment names only allow lowercase
+    alphanumeric characters and hyphens ([a-z0-9-]).
+    Invalid characters are replaced with hyphens.
     """
     if not value:
         return "app"
-    slug = re.sub(r"[^a-z0-9._-]+", "-", value.lower()).strip("-.")
+    slug = re.sub(r"[^a-z0-9-]+", "-", value.lower()).strip("-")
     return slug or "app"
 
 
@@ -307,9 +475,8 @@ def _resolve_env_path(
     if isinstance(env_field, str):
         env_path = (config_path.parent / env_field).resolve()
         if not env_path.exists():
-            click.secho(
-                f"Warning: env file '{env_field}' specified in langgraph.json not found.",
-                fg="yellow",
+            _get_emitter().note(
+                f"Warning: env file '{env_field}' specified in langgraph.json not found."
             )
             return None
         return env_path
@@ -343,7 +510,7 @@ def _secrets_from_env(
     secrets: list[dict[str, str]] = []
     for name, value in env_vars.items():
         if name in RESERVED_ENV_VARS:
-            click.secho(f"   Skipping reserved env var: {name}", fg="yellow")
+            _get_emitter().note(f"Skipping reserved env var: {name}")
             continue
         if not value:
             continue
@@ -386,8 +553,8 @@ def _resolve_build_mode(
 # ---------------------------------------------------------------------------
 
 
-def _log_deploy_step(step: int, message: str) -> None:
-    click.secho(f"{step}. {message}", fg="cyan")
+def _log_deploy_step(step: int, message: str, **extra: object) -> None:
+    _get_emitter().step(step, message, **extra)
 
 
 def _resolve_deployment(
@@ -411,12 +578,13 @@ def _resolve_deployment(
     found_id = _call_host_backend_with_optional_tenant(
         client, lambda c: find_deployment_id_by_name(c, name)
     )
+    em = _get_emitter()
     if found_id:
         deployment_id = str(found_id)
-        click.secho(f"   Found existing deployment (ID: {deployment_id})", fg="green")
+        em.info(f"Found existing deployment (ID: {deployment_id})")
     else:
         needs_creation = True
-        click.secho(not_found_message, fg="yellow")
+        em.warn(not_found_message)
     return deployment_id, needs_creation, step + 1
 
 
@@ -444,7 +612,7 @@ def _create_deployment(
         raise HostBackendError(
             "POST /v2/deployments succeeded but response missing a valid 'id'"
         )
-    click.secho(f"   Deployment ID: {created_id}", fg="green")
+    _get_emitter().info(f"Deployment ID: {created_id}", deployment_id=created_id)
     return created_id, step + 1
 
 
@@ -458,21 +626,36 @@ def _smith_dashboard_base_url(host_url: str | None) -> str:
     hostname = parsed.hostname or ""
     if hostname in ("localhost", "127.0.0.1"):
         return host_url.rstrip("/")
-    if hostname.startswith("eu."):
-        return "https://eu.smith.langchain.com"
+
+    api_host_suffix = "api.host.langchain.com"
+    if hostname == api_host_suffix:
+        return "https://smith.langchain.com"
+    if hostname.endswith(f".{api_host_suffix}"):
+        prefix = hostname[: -(len(api_host_suffix) + 1)]
+        return f"https://{prefix}.smith.langchain.com"
+
     return "https://smith.langchain.com"
 
 
-def _print_deployment_status_url(
+def _get_deployment_status_url(
     updated: object, deployment_id: str, host_url: str | None = None
-) -> None:
-    """Print the deployment status URL when tenant metadata is available."""
+) -> str | None:
+    """Compute the LangSmith dashboard URL for a deployment, if possible."""
     tenant_id = updated.get("tenant_id") if isinstance(updated, dict) else None
     if not tenant_id:
-        return
+        return None
     base = _smith_dashboard_base_url(host_url)
-    status_url = f"{base}/o/{tenant_id}/host/deployments/{deployment_id}"
-    click.secho(f"   View status: {status_url}", fg="cyan")
+    return f"{base}/o/{tenant_id}/host/deployments/{deployment_id}"
+
+
+def _emit_deployment_status_url(
+    updated: object, deployment_id: str, host_url: str | None = None
+) -> str | None:
+    """Emit the deployment status URL and return it."""
+    url = _get_deployment_status_url(updated, deployment_id, host_url)
+    if url:
+        _get_emitter().status_url(url)
+    return url
 
 
 def _poll_revision_status(
@@ -486,6 +669,7 @@ def _poll_revision_status(
     on_interrupt: Callable[[str], None] | None = None,
 ) -> tuple[str, str | None]:
     """Poll latest revision status until terminal status or timeout."""
+    em = _get_emitter()
     revisions_resp = client.list_revisions(deployment_id, limit=1)
     resources = (
         revisions_resp.get("resources", []) if isinstance(revisions_resp, dict) else []
@@ -497,7 +681,11 @@ def _poll_revision_status(
     last_status = ""
     deadline = time.time() + timeout_seconds
     start_time = time.monotonic()
-    with Progress(message=progress_message, elapsed=True) as set_progress:
+    last_heartbeat = start_time
+    json_mode = em.json_mode
+    with Progress(
+        message=progress_message, elapsed=True, json_mode=json_mode
+    ) as set_progress:
         while time.time() < deadline:
             try:
                 rev = client.get_revision(deployment_id, revision_id)
@@ -514,14 +702,15 @@ def _poll_revision_status(
             if status != last_status:
                 set_progress("")
                 if last_status:
-                    elapsed = time.monotonic() - start_time
-                    mins, secs = divmod(int(elapsed), 60)
-                    elapsed_str = f"{mins}m {secs:02d}s" if mins else f"{secs}s"
-                    click.echo(f"   {last_status}... ({elapsed_str})")
+                    em.status_change(last_status, time.monotonic() - start_time)
                 last_status = status
                 if status in _TERMINAL_STATUSES:
                     break
                 set_progress(f"{status}...")
+                last_heartbeat = time.monotonic()
+            elif json_mode and time.monotonic() - last_heartbeat > 10:
+                em.heartbeat(last_status, time.monotonic() - start_time)
+                last_heartbeat = time.monotonic()
 
             if on_poll is not None:
                 on_poll(status, revision_id, set_progress)
@@ -538,8 +727,10 @@ def _print_deployment_result(
     last_status: str,
     *,
     dashboard_label: str,
+    status_url: str | None = None,
 ) -> None:
     """Print final deployment status and raise on failure."""
+    em = _get_emitter()
     dep_info = client.get_deployment(deployment_id)
     custom_url = None
     if isinstance(dep_info, dict):
@@ -548,24 +739,28 @@ def _print_deployment_result(
             custom_url = sc.get("custom_url")
 
     if last_status == "DEPLOYED":
-        click.secho("   Deployment successful!", fg="green")
-        if custom_url:
-            click.secho(f"   URL: {custom_url}", fg="green")
+        em.result(
+            "succeeded",
+            deployment_id=deployment_id,
+            url=custom_url,
+            status_url=status_url,
+        )
     elif last_status in ("BUILD_FAILED", "DEPLOY_FAILED", "CREATE_FAILED"):
-        click.secho(f"   Deployment failed: {last_status}", fg="red")
+        em.result(
+            "failed",
+            deployment_id=deployment_id,
+            status_url=status_url,
+        )
         raise click.exceptions.Exit(1)
     else:
-        click.secho(
-            f"   Timed out waiting for deployment (last status: {last_status}).",
-            fg="yellow",
+        em.result(
+            "timed_out",
+            deployment_id=deployment_id,
+            status_url=status_url,
+            fallback_status_message=(
+                f"Check status in the LangSmith {dashboard_label}."
+            ),
         )
-        if custom_url:
-            click.secho(f"   Check status at: {custom_url}", fg="yellow")
-        else:
-            click.secho(
-                f"   Check status in the LangSmith {dashboard_label}.",
-                fg="yellow",
-            )
 
 
 # ---------------------------------------------------------------------------
@@ -594,14 +789,16 @@ def _docker_config_for_token(registry_host: str, token: str):
 # ---------------------------------------------------------------------------
 
 _UPLOAD_TIMEOUT_SECONDS = 300
+_BYTES_PER_MIB = 1_048_576
 
 
 class _ProgressReader:
-    """File-like wrapper that displays upload progress via click."""
+    """File-like wrapper that reports upload progress via the emitter."""
 
-    def __init__(self, fobj, file_size: int):
+    def __init__(self, fobj, file_size: int, emitter: "_Emitter"):
         self._fobj = fobj
         self._file_size = file_size
+        self._emitter = emitter
         self._uploaded = 0
 
     def read(self, size=-1):
@@ -611,10 +808,7 @@ class _ProgressReader:
             pct = (
                 int(self._uploaded * 100 / self._file_size) if self._file_size else 100
             )
-            click.echo(
-                f"\r   Uploading ({self._file_size / 1_048_576:.1f} MB)... {pct}%",
-                nl=False,
-            )
+            self._emitter.upload_progress(self._file_size / _BYTES_PER_MIB, pct)
         return data
 
     def __len__(self):
@@ -626,10 +820,13 @@ def _upload_to_gcs(signed_url: str, file_path: str, file_size: int) -> None:
     import urllib.error
     import urllib.request
 
+    em = _get_emitter()
+
     with open(file_path, "rb") as f:
+        reader = _ProgressReader(f, file_size, em)
         req = urllib.request.Request(
             signed_url,
-            data=_ProgressReader(f, file_size),
+            data=reader,
             method="PUT",
             headers={
                 "Content-Type": "application/gzip",
@@ -644,7 +841,8 @@ def _upload_to_gcs(signed_url: str, file_path: str, file_size: int) -> None:
             raise click.ClickException(
                 f"Upload failed with status {err.code}: {detail}"
             ) from None
-    click.echo()
+    if not em.json_mode:
+        click.echo()
 
 
 # ---------------------------------------------------------------------------
@@ -652,6 +850,41 @@ def _upload_to_gcs(signed_url: str, file_path: str, file_size: int) -> None:
 # ---------------------------------------------------------------------------
 
 
+def _resolve_pushed_image_digest(
+    runner,
+    *,
+    remote_image: str,
+    docker_config_dir: str | None,
+    verbose: bool,
+) -> str:
+    """Return ``{registry}/{repo}@sha256:<hex>`` for a freshly-pushed image.
+
+    Reads ``RepoDigests`` via ``docker image inspect`` — the local daemon
+    records the registry's manifest digest there after a successful push.
+    Falls back to ``remote_image`` with a warning if no matching digest is
+    found, rather than failing the deploy.
+    """
+    # rsplit preserves ``:port`` in the registry host.
+    repo_no_tag = remote_image.rsplit(":", 1)[0]
+    args: list[str] = ["docker"]
+    if docker_config_dir:
+        args += ["--config", docker_config_dir]
+    args += ["image", "inspect", "--format", "{{json .RepoDigests}}", remote_image]
+    stdout, _ = runner.run(subp_exec(*args, collect=True, verbose=verbose))
+    try:
+        digests = json_mod.loads(stdout or "[]") or []
+    except json_mod.JSONDecodeError:
+        digests = []
+    for d in digests:
+        if isinstance(d, str) and d.startswith(f"{repo_no_tag}@sha256:"):
+            return d
+    _get_emitter().warn(
+        f"Could not resolve image digest for {remote_image}; "
+        "falling back to the tag-based reference. Re-run with --verbose for details."
+    )
+    return remote_image
+
+
 def _run_local_build(
     *,
     client: HostBackendClient,
@@ -670,6 +903,7 @@ def _run_local_build(
     build_command: str | None,
     docker_build_args: Sequence[str],
     secrets: list[dict[str, str]],
+    tracked_packages: list[str] | None,
 ) -> BuildResult:
     """Build locally with Docker, push to registry, update deployment."""
     # Use buildx to cross-compile for amd64 when running on a non-x86_64 host
@@ -752,7 +986,7 @@ def _run_local_build(
         if "://" in normalized_registry:
             normalized_registry = normalized_registry.split("//", 1)[1]
         repo_seed = image_name or name or config.parent.name
-        repo_name = normalize_image_name(repo_seed)
+        repo_name = normalize_name(repo_seed)
         tag_value = normalize_image_tag(tag)
         remote_image = f"{normalized_registry}/{repo_name}:{tag_value}"
 
@@ -811,17 +1045,28 @@ def _run_local_build(
                     break
                 except click.exceptions.Exit:
                     if attempt < max_push_retries - 1:
-                        click.secho(
-                            f"   Push failed, retrying (attempt {attempt + 2} of {max_push_retries})...",
-                            fg="yellow",
+                        _get_emitter().warn(
+                            f"   Push failed, retrying (attempt {attempt + 2} of {max_push_retries})..."
                         )
                     else:
                         raise
         step += 1
 
+        resolved_image = _resolve_pushed_image_digest(
+            runner,
+            remote_image=remote_image,
+            docker_config_dir=None,
+            verbose=verbose,
+        )
+
         # -- Step: Update deployment --
         _log_deploy_step(step, f"Updating deployment {deployment_id}")
-        updated = client.update_deployment(deployment_id, remote_image, secrets=secrets)
+        updated = client.update_deployment(
+            deployment_id,
+            resolved_image,
+            secrets=secrets,
+            tracked_packages=tracked_packages,
+        )
 
     return BuildResult(
         updated=updated if isinstance(updated, dict) else {},
@@ -843,13 +1088,15 @@ def _run_remote_build(
     install_command: str | None,
     build_command: str | None,
     secrets: list[dict[str, str]],
+    tracked_packages: list[str] | None,
 ) -> BuildResult:
     """Upload source tarball and trigger a remote build."""
     from langgraph_cli.archive import create_archive
 
+    em = _get_emitter()
     _log_deploy_step(step, "Creating source archive")
     with create_archive(config, config_json) as (archive_path, file_size, config_rel):
-        click.secho(f"   Archive created ({file_size / 1_048_576:.1f} MB)", fg="green")
+        em.info(f"Archive created ({file_size / _BYTES_PER_MIB:.1f} MB)")
         step += 1
 
         _log_deploy_step(step, "Requesting upload URL")
@@ -872,6 +1119,7 @@ def _run_remote_build(
         secrets=secrets,
         install_command=install_command,
         build_command=build_command,
+        tracked_packages=tracked_packages,
     )
 
     log_offset: str | None = None
@@ -897,12 +1145,12 @@ def _run_remote_build(
                 if has_output:
                     set_progress("")
                     if not logs_header_printed:
-                        click.echo(f"   {status} (build logs):")
+                        em.info(f"{status} (build logs):")
                         logs_header_printed = True
                 for entry in entries:
                     msg = entry.get("message", "")
                     if msg:
-                        click.echo(f"   | {msg}")
+                        em.log(msg)
                 log_offset = logs_resp.get("next_offset") or log_offset
                 if has_output:
                     set_progress(f"{status}...")
@@ -910,11 +1158,10 @@ def _run_remote_build(
             pass
 
     def _handle_interrupt(revision_id: str) -> None:
-        click.secho(
-            f"\n   Interrupted. Deployment ID: {deployment_id}, Revision ID: {revision_id}",
-            fg="yellow",
+        em.warn(
+            f"\nInterrupted. Deployment ID: {deployment_id}, Revision ID: {revision_id}"
         )
-        click.secho("   The build will continue remotely.", fg="yellow")
+        em.warn("The build will continue remotely.")
 
     return BuildResult(
         updated=updated if isinstance(updated, dict) else {},
@@ -952,12 +1199,20 @@ def _create_host_backend_client(
                 resolved_api_key = val
                 break
     if not resolved_api_key:
+        if _no_input:
+            raise click.ClickException(
+                "No LangSmith API key found. Set LANGSMITH_API_KEY in the "
+                "environment or .env file."
+            )
         click.secho(
             "No LangSmith API key found. Create one at Settings > API Keys in LangSmith.",
             fg="yellow",
         )
         resolved_api_key = click.prompt("Enter LangSmith API key", hide_input=True)
-    return HostBackendClient(host_url, resolved_api_key)
+    tenant_id = env_vars.get("LANGSMITH_TENANT_ID") or os.environ.get(
+        "LANGSMITH_TENANT_ID"
+    )
+    return HostBackendClient(host_url, resolved_api_key, tenant_id=tenant_id)
 
 
 def _call_host_backend_with_optional_tenant(
@@ -982,6 +1237,12 @@ def _call_host_backend_with_optional_tenant(
                 and err.status_code == 403
                 and "requires workspace specification" in err.message
             ):
+                if _no_input:
+                    raise click.ClickException(
+                        "API key is org-scoped and requires a workspace ID. "
+                        "Set LANGSMITH_TENANT_ID in your .env file or "
+                        "use a workspace-scoped API key."
+                    ) from None
                 click.secho(
                     "Your API key is org-scoped and requires a workspace ID.",
                     fg="yellow",
@@ -1189,6 +1450,19 @@ def _deploy_base_options(
                     "if Docker is not available locally."
                 ),
             ),
+            click.option(
+                "--json",
+                "json_output",
+                is_flag=True,
+                default=False,
+                help="Emit structured JSON-lines to stdout instead of human-readable text.",
+            ),
+            click.option(
+                "--no-input",
+                is_flag=True,
+                default=False,
+                help="Never prompt for input; fail with an error if a required value is missing.",
+            ),
         ]
         if include_docker_args:
             # Only attach build args to the default command; on the group they
@@ -1256,36 +1530,50 @@ def _deploy_cmd(
     no_wait: bool,
     remote_build_flag: bool | None,
     docker_build_args: Sequence[str],
+    json_output: bool,
+    no_input: bool,
 ):
-    click.secho(
-        "Note: 'langgraph deploy' is in beta. Expect frequent updates and improvements.",
-        fg="yellow",
+    global _emitter, _no_input
+    _emitter = _Emitter(json_mode=json_output)
+    _no_input = no_input
+    em = _emitter
+
+    em.note(
+        "Note: 'langgraph deploy' is in beta. Expect frequent updates and improvements."
     )
-    click.echo()
+    if not json_output:
+        click.echo()
 
     # -- 1. Preflight --
     validate_deploy_commands(install_command, build_command)
     config_json = langgraph_cli.config.validate_config_file(config)
-    warn_non_wolfi_distro(config_json)
+    warn_non_wolfi_distro(config_json, emit=em.note)
 
     env_vars = _parse_env_from_config(config_json, config)
 
     if not deployment_id and not name:
         name = env_vars.get(_DEPLOYMENT_NAME_ENV)
     if not deployment_id and not name:
-        default_name = normalize_image_name(pathlib.Path.cwd().name)
-        name = click.prompt("Deployment name", default=default_name)
-        env_path = _resolve_env_path(config_json, config)
-        if env_path is not None:
-            set_key(str(env_path), _DEPLOYMENT_NAME_ENV, name)
-            click.echo(f"Saved deployment name to {env_path}")
+        default_name = normalize_name(pathlib.Path.cwd().name)
+        if no_input:
+            name = default_name
+        else:
+            name = click.prompt("Deployment name", default=default_name)
+    if name and not deployment_id:
+        name = normalize_name(name)
+        if not no_input:
+            env_path = _resolve_env_path(config_json, config)
+            if env_path is not None:
+                set_key(str(env_path), _DEPLOYMENT_NAME_ENV, name)
+                em.info(f"Saved deployment name to {env_path}")
 
     secrets = _secrets_from_env(_env_without_deployment_name(env_vars))
 
     use_remote_build, local_build_error = _resolve_build_mode(remote_build_flag)
     if use_remote_build and remote_build_flag is None and local_build_error:
-        click.secho(f"{local_build_error}\nUsing remote build instead.", fg="yellow")
-        click.echo()
+        em.note(f"{local_build_error}\nUsing remote build instead.")
+        if not json_output:
+            click.echo()
 
     # -- 2. Resolve / create deployment --
     client = _create_host_backend_client(host_url, api_key, env_vars=env_vars)
@@ -1297,9 +1585,9 @@ def _deploy_cmd(
         deployment_id,
         name,
         not_found_message=(
-            "   No deployment found. Will create."
+            "No deployment found. Will create."
             if use_remote_build
-            else "   No deployment found. Will create after build."
+            else "No deployment found. Will create after build."
         ),
     )
 
@@ -1316,6 +1604,15 @@ def _deploy_cmd(
     if not deployment_id:
         raise click.ClickException("Failed to determine deployment ID")
 
+    # Scan local sources for tracked packages so the new revision carries
+    # the same metadata GitHub-backed deploys produce. Failures must never
+    # block a deploy.
+    try:
+        tracked_packages = find_tracked_packages(config, config_json) or None
+    except Exception as exc:
+        em.warn(f"Skipped tracked-package scan: {exc}")
+        tracked_packages = None
+
     # -- 3. Build (divergent path) --
     if use_remote_build:
         build_result = _run_remote_build(
@@ -1328,6 +1625,7 @@ def _deploy_cmd(
             install_command=install_command,
             build_command=build_command,
             secrets=secrets,
+            tracked_packages=tracked_packages,
         )
     else:
         build_result = _run_local_build(
@@ -1347,13 +1645,18 @@ def _deploy_cmd(
             build_command=build_command,
             docker_build_args=docker_build_args,
             secrets=secrets,
+            tracked_packages=tracked_packages,
         )
 
     # -- 4. Shared wait + result --
-    _print_deployment_status_url(build_result.updated, deployment_id, host_url)
+    dep_status_url = _emit_deployment_status_url(
+        build_result.updated,
+        deployment_id,
+        host_url,
+    )
 
     if no_wait:
-        click.secho(f"   {build_result.no_result_message}", fg="green")
+        em.info(build_result.no_result_message)
         return
 
     last_status, revision_id = _poll_revision_status(
@@ -1366,7 +1669,7 @@ def _deploy_cmd(
         on_interrupt=build_result.on_interrupt,
     )
     if not last_status:
-        click.secho(f"   {build_result.no_result_message}", fg="green")
+        em.info(build_result.no_result_message)
         return
 
     if (
@@ -1375,7 +1678,7 @@ def _deploy_cmd(
         and not verbose
         and revision_id is not None
     ):
-        click.secho("   Last build log lines:", fg="red")
+        em.error("Last build log lines:")
         try:
             logs_resp = client.get_build_logs(
                 deployment_id,
@@ -1387,19 +1690,17 @@ def _deploy_cmd(
                 for entry in entries:
                     msg = entry.get("message", "")
                     if msg:
-                        click.echo(f"   | {msg}")
+                        em.log(msg)
         except Exception:
-            click.secho("   (failed to fetch build logs)", fg="red")
-        click.secho(
-            "   Re-run with --verbose to see full build output.",
-            fg="yellow",
-        )
+            em.error("(failed to fetch build logs)")
+        em.warn("Re-run with --verbose to see full build output.")
 
     _print_deployment_result(
         client,
         deployment_id,
         last_status,
         dashboard_label="Deployment dashboard",
+        status_url=dep_status_url,
     )
 
 

libs/cli/langgraph_cli/host_backend.py

@@ -122,11 +122,14 @@ class HostBackendClient:
         deployment_id: str,
         image_uri: str,
         secrets: list[dict[str, str]] | None = None,
+        tracked_packages: list[str] | None = None,
     ) -> dict[str, Any]:
         payload: dict[str, Any] = {
             "revision_source": "internal_docker",
             "source_revision_config": {"image_uri": image_uri},
         }
+        if tracked_packages:
+            payload["tracked_packages"] = tracked_packages
         if secrets is not None:
             payload["secrets"] = secrets
         return self._request(
@@ -143,6 +146,7 @@ class HostBackendClient:
         secrets: list[dict[str, str]] | None = None,
         install_command: str | None = None,
         build_command: str | None = None,
+        tracked_packages: list[str] | None = None,
     ) -> dict[str, Any]:
         """Trigger a remote build revision with the uploaded tarball."""
         payload: dict[str, Any] = {
@@ -152,6 +156,8 @@ class HostBackendClient:
                 "langgraph_config_path": config_path,
             },
         }
+        if tracked_packages:
+            payload["tracked_packages"] = tracked_packages
 
         source_config: dict[str, Any] = {}
         if install_command is not None:

libs/cli/langgraph_cli/progress.py

@@ -12,10 +12,11 @@ class Progress:
         while True:
             yield from "|/-\\"
 
-    def __init__(self, *, message="", elapsed: bool = False):
+    def __init__(self, *, message="", elapsed: bool = False, json_mode: bool = False):
         self.message = message
         self._base_message = message
         self._show_elapsed = elapsed
+        self._json_mode = json_mode
         # use this to make sure we don't kill thread when we set msg to ""
         self._stop = threading.Event()
         # signalled when the spinner has no text on screen
@@ -69,6 +70,9 @@ class Progress:
             self._line_clear.set()
 
     def __enter__(self) -> Callable[[str], None]:
+        if self._json_mode:
+            return lambda message: None
+
         if sys.stdout.isatty():
             self.thread = threading.Thread(target=self.spinner_task)
             self.thread.start()
@@ -90,6 +94,8 @@ class Progress:
             return set_message
 
     def __exit__(self, exception, value, tb):
+        if self._json_mode:
+            return
         if sys.stdout.isatty():
             self.message = ""
             self._stop.set()

libs/cli/langgraph_cli/util.py

@@ -1,5 +1,7 @@
 """General-purpose utilities shared across the LangGraph CLI."""
 
+from collections.abc import Callable
+
 import click
 
 
@@ -7,21 +9,42 @@ def clean_empty_lines(input_str: str):
     return "\n".join(filter(None, input_str.splitlines()))
 
 
-def warn_non_wolfi_distro(config_json: dict) -> None:
-    """Show warning if image_distro is not set to 'wolfi'."""
+def warn_non_wolfi_distro(
+    config_json: dict,
+    *,
+    emit: Callable[[str], None] | None = None,
+) -> None:
+    """Show warning if image_distro is not set to 'wolfi'.
+
+    When ``emit`` is provided, each warning line is sent through it (used by
+    callers that need JSON-aware output). Otherwise falls back to colored
+    ``click.secho`` output.
+    """
     image_distro = config_json.get("image_distro", "debian")  # Default is debian
-    if image_distro != "wolfi":
-        click.secho(
-            "⚠️  Security Recommendation: Consider switching to Wolfi Linux for enhanced security.",
-            fg="yellow",
-            bold=True,
+    if image_distro == "wolfi":
+        return
+    if emit is not None:
+        emit(
+            "⚠️  Security Recommendation: Consider switching to Wolfi Linux for enhanced security."
         )
-        click.secho(
-            "   Wolfi is a security-oriented, minimal Linux distribution designed for containers.",
-            fg="yellow",
+        emit(
+            "   Wolfi is a security-oriented, minimal Linux distribution designed for containers."
         )
-        click.secho(
-            '   To switch, add \'"image_distro": "wolfi"\' to your langgraph.json config file.',
-            fg="yellow",
+        emit(
+            '   To switch, add \'"image_distro": "wolfi"\' to your langgraph.json config file.'
         )
-        click.secho("")  # Empty line for better readability
+        return
+    click.secho(
+        "⚠️  Security Recommendation: Consider switching to Wolfi Linux for enhanced security.",
+        fg="yellow",
+        bold=True,
+    )
+    click.secho(
+        "   Wolfi is a security-oriented, minimal Linux distribution designed for containers.",
+        fg="yellow",
+    )
+    click.secho(
+        '   To switch, add \'"image_distro": "wolfi"\' to your langgraph.json config file.',
+        fg="yellow",
+    )
+    click.secho("")  # Empty line for better readability

libs/cli/langgraph_cli/uv_lock.py

@@ -10,7 +10,13 @@ except ModuleNotFoundError:  # pragma: no cover - exercised on Python 3.10.
     import tomli as tomllib
 
 import click
+import pathspec
 
+from langgraph_cli._ignore import (
+    _build_dockerignore_negation_hints,
+    _build_ignore_spec,
+    _is_always_excluded,
+)
 from langgraph_cli.schemas import Config
 
 
@@ -440,16 +446,32 @@ def _container_root_for_uv_lock_package(
 
 
 def _uv_lock_package_copy_items(
-    package: UvLockPackage, plan: UvLockPlan
+    package: UvLockPackage,
+    plan: UvLockPlan,
+    ignore_spec: pathspec.PathSpec,
 ) -> tuple[tuple[pathlib.PurePosixPath, pathlib.PurePosixPath], ...]:
+    # Skip entries that .dockerignore / built-in exclusions would strip from
+    # the build context. Emitting `ADD <path>` for a file that Docker has
+    # filtered out causes the build to fail with
+    # "failed to compute cache key: <path> not found".
     if package.root != plan.project_root:
         relative_root = pathlib.PurePosixPath(
             *package.root.relative_to(plan.project_root).parts
         )
+        if _is_always_excluded(relative_root, is_dir=True) or ignore_spec.match_file(
+            f"{relative_root.as_posix()}/"
+        ):
+            raise click.UsageError(
+                f"Workspace member '{package.name}' at {relative_root} is "
+                "excluded from the Docker build context, but uv.lock requires "
+                "it to be copied into the build context. Remove the matching "
+                "pattern or drop the member from [tool.uv.workspace].members."
+            )
         return ((relative_root, plan.container_roots[package.root]),)
 
     root_container = plan.container_roots[package.root]
     workspace_member_roots = plan.all_workspace_roots - {plan.project_root}
+    negated_dockerignore_hints = _build_dockerignore_negation_hints(plan.project_root)
 
     def iter_entries(
         current_dir: pathlib.Path,
@@ -461,18 +483,32 @@ def _uv_lock_package_copy_items(
                 # and excluded entirely otherwise.
                 continue
 
-            descendant_member_roots = [
-                ws_root
-                for ws_root in workspace_member_roots
-                if child in ws_root.parents
-            ]
-            if child.is_dir() and descendant_member_roots:
-                entries.extend(iter_entries(child))
-                continue
-
             relative_child = pathlib.PurePosixPath(
                 *child.relative_to(plan.project_root).parts
             )
+            is_dir = child.is_dir()
+            if _is_always_excluded(relative_child, is_dir=is_dir):
+                continue
+            ignored = ignore_spec.match_file(
+                f"{relative_child.as_posix()}/" if is_dir else relative_child.as_posix()
+            )
+            is_workspace_parent = is_dir and any(
+                child in ws_root.parents for ws_root in workspace_member_roots
+            )
+
+            if is_workspace_parent:
+                entries.extend(iter_entries(child))
+                continue
+            if (
+                is_dir
+                and ignored
+                and negated_dockerignore_hints.requires_dir_walk(relative_child)
+            ):
+                entries.extend(iter_entries(child))
+                continue
+            if ignored:
+                continue
+
             entries.append(
                 (relative_child, root_container.joinpath(*relative_child.parts))
             )
@@ -956,10 +992,13 @@ def python_config_to_docker_uv_lock(
     docker_plan.add_raw("# -- End of uv.lock dependencies install --")
     docker_plan.add_blank()
 
+    ignore_spec = _build_ignore_spec(plan.project_root, include_gitignore=False)
     for package in plan.install_order:
         package_label = package.root.relative_to(plan.project_root).as_posix() or "."
         docker_plan.add_raw(f"# -- Adding workspace package {package_label} --")
-        for source, destination in _uv_lock_package_copy_items(package, plan):
+        for source, destination in _uv_lock_package_copy_items(
+            package, plan, ignore_spec
+        ):
             docker_plan.add_raw(copy_from_project_root(source, destination.as_posix()))
         docker_plan.add_instruction(
             "WORKDIR", plan.container_roots[package.root].as_posix()

libs/cli/pyproject.toml

@@ -23,13 +23,13 @@ dependencies = [
 path = "langgraph_cli/__init__.py"
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.5.35,<0.8.0 ; python_version >= '3.11'",
+    "langgraph-api>=0.5.35,<0.10.0 ; python_version >= '3.11'",
     "langgraph-runtime-inmem>=0.7 ; python_version >= '3.11'",
 ]
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/cli"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 

libs/cli/tests/unit_tests/test_archive.py

@@ -99,6 +99,13 @@ class TestBuildIgnoreSpec:
         assert spec.match_file("app.log")
         assert spec.match_file("mod.pyc")
 
+    def test_can_skip_gitignore(self, tmp_path):
+        (tmp_path / ".dockerignore").write_text("*.log\n")
+        (tmp_path / ".gitignore").write_text("*.pyc\n")
+        spec = _build_ignore_spec(tmp_path, include_gitignore=False)
+        assert spec.match_file("app.log")
+        assert not spec.match_file("mod.pyc")
+
     def test_no_ignore_files_only_builtins(self, tmp_path):
         spec = _build_ignore_spec(tmp_path)
         assert spec.match_file("__pycache__/")

libs/cli/tests/unit_tests/test_config.py

@@ -4,6 +4,7 @@ import os
 import pathlib
 import tempfile
 import textwrap
+from unittest.mock import patch
 
 import click
 import pytest
@@ -1855,6 +1856,364 @@ def test_config_to_docker_uv_lock_supports_single_uv_project_root():
         assert additional_contexts == {}
 
 
+def test_config_to_docker_uv_lock_skips_dockerignore_entries():
+    """Entries filtered by .dockerignore / built-in excludes must not appear
+    as ADD lines. Docker fails to compute the cache key for paths that the
+    build context has stripped."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root = tmpdir_path / "single"
+        project_root.mkdir()
+        (project_root / "uv.lock").write_text("# uv lock file\n")
+        (project_root / "pyproject.toml").write_text(
+            textwrap.dedent(
+                """
+                [project]
+                name = "single-app"
+                version = "0.1.0"
+                dependencies = ["httpx>=0.28"]
+
+                [build-system]
+                requires = ["setuptools>=61"]
+                build-backend = "setuptools.build_meta"
+                """
+            ).strip()
+            + "\n"
+        )
+        (project_root / "langgraph.json").write_text("{}\n")
+        (project_root / "src").mkdir()
+        (project_root / "src" / "agent.py").write_text("graph = object()\n")
+        (project_root / "README.md").write_text("# hi\n")
+
+        # Built-in exclusions — must never appear as ADD lines.
+        (project_root / ".git").mkdir()
+        (project_root / ".git" / "HEAD").write_text("ref: refs/heads/main\n")
+        (project_root / ".venv").mkdir()
+        (project_root / ".venv" / "pyvenv.cfg").write_text("home = /usr\n")
+        (project_root / "__pycache__").mkdir()
+        (project_root / "__pycache__" / "x.cpython-311.pyc").write_bytes(b"\x00")
+
+        # .dockerignore excludes .gitignore and a custom path.
+        (project_root / ".dockerignore").write_text(".gitignore\nsecrets.env\n")
+        (project_root / ".gitignore").write_text("*.pyc\n")
+        (project_root / "secrets.env").write_text("TOKEN=abc\n")
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "./src/agent.py:graph"},
+                "source": {"kind": "uv"},
+            }
+        )
+        docker, _ = config_to_docker(
+            project_root / "langgraph.json",
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+        for excluded in (
+            "ADD .git ",
+            "ADD .gitignore ",
+            "ADD .venv ",
+            "ADD __pycache__ ",
+            "ADD secrets.env ",
+        ):
+            assert excluded not in docker, (
+                f"{excluded!r} should be filtered out of Dockerfile:\n{docker}"
+            )
+
+        # The .dockerignore itself is still part of the context and should be
+        # ADDed (Docker needs it at build time, and archive.py includes it).
+        assert "ADD .dockerignore /deps/workspace/.dockerignore" in docker
+        assert "ADD src /deps/workspace/src" in docker
+        assert "ADD README.md /deps/workspace/README.md" in docker
+
+
+def test_config_to_docker_uv_lock_does_not_apply_gitignore():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root = tmpdir_path / "single"
+        project_root.mkdir()
+        (project_root / "uv.lock").write_text("# uv lock file\n")
+        (project_root / "pyproject.toml").write_text(
+            textwrap.dedent(
+                """
+                [project]
+                name = "single-app"
+                version = "0.1.0"
+                dependencies = ["httpx>=0.28"]
+
+                [build-system]
+                requires = ["setuptools>=61"]
+                build-backend = "setuptools.build_meta"
+                """
+            ).strip()
+            + "\n"
+        )
+        (project_root / "langgraph.json").write_text("{}\n")
+        (project_root / "src").mkdir()
+        (project_root / "src" / "agent.py").write_text("graph = object()\n")
+        (project_root / "README.md").write_text("# hi\n")
+        (project_root / ".gitignore").write_text("README.md\n")
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "./src/agent.py:graph"},
+                "source": {"kind": "uv"},
+            }
+        )
+        docker, _ = config_to_docker(
+            project_root / "langgraph.json",
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+        assert "ADD README.md /deps/workspace/README.md" in docker
+
+
+def test_config_to_docker_uv_lock_skips_dockerignore_entries_in_workspace():
+    """Multi-member workspace: ignore patterns must filter root-level entries
+    AND entries encountered while recursing into directories that contain
+    workspace members (the `descendant_member_roots` branch)."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root, config_path = _write_uv_lock_workspace(
+            tmpdir_path,
+            agent_dependencies=["workspace-root", "shared", "httpx>=0.28"],
+            root_sources="[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
+            agent_sources="[tool.uv.sources]\nshared = { workspace = true }\nworkspace-root = { workspace = true }",
+        )
+        root_src = project_root / "src" / "workspace_root"
+        root_src.mkdir(parents=True)
+        (root_src / "__init__.py").write_text("__all__ = []\n")
+        (project_root / "README.md").write_text("workspace root package\n")
+
+        # A non-member sibling of the `apps/agent` member that should be
+        # filtered out via .dockerignore. This exercises the recursion into
+        # `apps/` where `apps/agent` is kept (it's a member) but its sibling is
+        # filtered.
+        (project_root / "apps" / "scratch.txt").write_text("scratch\n")
+        # A root-level path that .dockerignore excludes.
+        (project_root / "secrets.env").write_text("TOKEN=abc\n")
+        (project_root / ".dockerignore").write_text("secrets.env\napps/scratch.txt\n")
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {
+                    "agent": "../../apps/agent/src/agent/graph.py:graph",
+                },
+                "source": {"kind": "uv", "root": "../..", "package": "agent"},
+            }
+        )
+        docker, _ = config_to_docker(
+            config_path, config, base_image="langchain/langgraph-api:0.2.47"
+        )
+
+        assert "COPY --from=uv-workspace-root src /deps/workspace/src" in docker
+        assert (
+            "COPY --from=uv-workspace-root README.md /deps/workspace/README.md"
+            in docker
+        )
+        assert (
+            "COPY --from=uv-workspace-root .dockerignore /deps/workspace/.dockerignore"
+            in docker
+        )
+        assert "secrets.env" not in docker
+        assert "apps/scratch.txt" not in docker
+        # Workspace members themselves are still copied via their own per-member
+        # COPY line — the sibling filter must not disturb this.
+        assert (
+            "COPY --from=uv-workspace-root apps/agent /deps/workspace/apps/agent"
+            in docker
+        )
+
+
+def test_config_to_docker_uv_lock_preserves_negated_dockerignore_descendants():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root = tmpdir_path / "single"
+        project_root.mkdir()
+        (project_root / "uv.lock").write_text("# uv lock file\n")
+        (project_root / "pyproject.toml").write_text(
+            textwrap.dedent(
+                """
+                [project]
+                name = "single-app"
+                version = "0.1.0"
+                dependencies = ["httpx>=0.28"]
+
+                [build-system]
+                requires = ["setuptools>=61"]
+                build-backend = "setuptools.build_meta"
+                """
+            ).strip()
+            + "\n"
+        )
+        (project_root / "langgraph.json").write_text("{}\n")
+        (project_root / "src").mkdir()
+        (project_root / "src" / "agent.py").write_text("graph = object()\n")
+        (project_root / "assets").mkdir()
+        (project_root / "assets" / "keep.txt").write_text("keep\n")
+        (project_root / "assets" / "drop.txt").write_text("drop\n")
+        (project_root / ".dockerignore").write_text("assets/\n!assets/keep.txt\n")
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "./src/agent.py:graph"},
+                "source": {"kind": "uv"},
+            }
+        )
+        docker, _ = config_to_docker(
+            project_root / "langgraph.json",
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+        assert "ADD assets /deps/workspace/assets" not in docker
+        assert "ADD assets/keep.txt /deps/workspace/assets/keep.txt" in docker
+        assert "assets/drop.txt" not in docker
+
+
+def test_config_to_docker_uv_lock_prunes_unrelated_ignored_subtrees():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root = tmpdir_path / "single"
+        project_root.mkdir()
+        (project_root / "uv.lock").write_text("# uv lock file\n")
+        (project_root / "pyproject.toml").write_text(
+            textwrap.dedent(
+                """
+                [project]
+                name = "single-app"
+                version = "0.1.0"
+                dependencies = ["httpx>=0.28"]
+
+                [build-system]
+                requires = ["setuptools>=61"]
+                build-backend = "setuptools.build_meta"
+                """
+            ).strip()
+            + "\n"
+        )
+        (project_root / "langgraph.json").write_text("{}\n")
+        (project_root / "src").mkdir()
+        (project_root / "src" / "agent.py").write_text("graph = object()\n")
+        (project_root / "assets").mkdir()
+        (project_root / "assets" / "keep.txt").write_text("keep\n")
+        (project_root / "vendor").mkdir()
+        (project_root / "vendor" / "huge.txt").write_text("large\n")
+        (project_root / ".dockerignore").write_text(
+            "vendor/\nassets/\n!assets/keep.txt\n"
+        )
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "./src/agent.py:graph"},
+                "source": {"kind": "uv"},
+            }
+        )
+
+        original_iterdir = pathlib.Path.iterdir
+
+        def guarded_iterdir(self):
+            if self == project_root / "vendor":
+                raise AssertionError("should not walk unrelated ignored subtree")
+            return original_iterdir(self)
+
+        with patch.object(
+            pathlib.Path, "iterdir", autospec=True, side_effect=guarded_iterdir
+        ):
+            docker, _ = config_to_docker(
+                project_root / "langgraph.json",
+                config,
+                base_image="langchain/langgraph-api:0.2.47",
+            )
+
+        assert "ADD assets/keep.txt /deps/workspace/assets/keep.txt" in docker
+        assert "vendor/huge.txt" not in docker
+
+
+def test_config_to_docker_uv_lock_never_reincludes_always_excluded_subtrees():
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root = tmpdir_path / "single"
+        project_root.mkdir()
+        (project_root / "uv.lock").write_text("# uv lock file\n")
+        (project_root / "pyproject.toml").write_text(
+            textwrap.dedent(
+                """
+                [project]
+                name = "single-app"
+                version = "0.1.0"
+                dependencies = ["httpx>=0.28"]
+
+                [build-system]
+                requires = ["setuptools>=61"]
+                build-backend = "setuptools.build_meta"
+                """
+            ).strip()
+            + "\n"
+        )
+        (project_root / "langgraph.json").write_text("{}\n")
+        (project_root / "src").mkdir()
+        (project_root / "src" / "agent.py").write_text("graph = object()\n")
+        (project_root / ".venv" / "pkg").mkdir(parents=True)
+        (project_root / ".venv" / "pkg" / "keep.txt").write_text("keep\n")
+        (project_root / "node_modules" / "pkg").mkdir(parents=True)
+        (project_root / "node_modules" / "pkg" / "package.json").write_text("{}\n")
+        (project_root / ".dockerignore").write_text(
+            "!.venv/pkg/keep.txt\n!node_modules/pkg/package.json\n"
+        )
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "./src/agent.py:graph"},
+                "source": {"kind": "uv"},
+            }
+        )
+        docker, _ = config_to_docker(
+            project_root / "langgraph.json",
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+        assert ".venv/pkg/keep.txt" not in docker
+        assert "node_modules/pkg/package.json" not in docker
+        assert "ADD src /deps/workspace/src" in docker
+
+
+def test_config_to_docker_uv_lock_rejects_ignored_workspace_member():
+    """A workspace member matched by .dockerignore cannot be copied into the
+    build context — uv.lock requires it, so fail loudly with a clear message."""
+    with tempfile.TemporaryDirectory() as tmpdir:
+        tmpdir_path = pathlib.Path(tmpdir)
+        project_root, config_path = _write_uv_lock_workspace(
+            tmpdir_path,
+            agent_sources="[tool.uv.sources]\nshared = { workspace = true }",
+        )
+        (project_root / ".dockerignore").write_text("libs/shared\n")
+
+        config = validate_config(
+            {
+                "python_version": "3.11",
+                "graphs": {"agent": "../../apps/agent/src/agent/graph.py:graph"},
+                "source": {"kind": "uv", "root": "../..", "package": "agent"},
+                "auth": {"path": "../../libs/shared/src/shared/auth.py:create_auth"},
+            }
+        )
+        with pytest.raises(
+            click.UsageError, match=r"Workspace member 'shared' at libs/shared"
+        ):
+            config_to_docker(
+                config_path, config, base_image="langchain/langgraph-api:0.2.47"
+            )
+
+
 def test_config_to_docker_uv_lock_rejects_invalid_source_package_type():
     with tempfile.TemporaryDirectory() as tmpdir:
         tmpdir_path = pathlib.Path(tmpdir)
@@ -2585,6 +2944,23 @@ def test_docker_tag_with_api_version(in_config: bool):
     assert tag == f"langchain/langgraph-server:{version}-py3.11"
 
 
+@pytest.mark.parametrize("in_config", [False, True])
+@pytest.mark.parametrize("version", ["0.9.0rc1", "0.9.0.dev1"])
+def test_docker_tag_with_prerelease_api_version(version: str, in_config: bool):
+    """Test docker_tag with prerelease and dev api_version values."""
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "api_version": version if in_config else None,
+        }
+    )
+
+    tag = docker_tag(config, api_version=version if not in_config else None)
+    assert tag == f"langchain/langgraph-api:{version}-py3.11"
+
+
 def test_config_to_docker_with_api_version():
     """Test config_to_docker function with api_version parameter."""
 

libs/cli/tests/unit_tests/test_dependency_tracking.py

@@ -0,0 +1,134 @@
+import pathlib
+
+import pytest
+
+from langgraph_cli.dependency_tracking import (
+    TRACKED_PACKAGES,
+    find_tracked_packages,
+)
+
+
+def _write_project(
+    tmp_path: pathlib.Path,
+    *,
+    dep_subdir: str = ".",
+    uv_lock: str | None = None,
+    pyproject: str | None = None,
+    requirements: str | None = None,
+    dependencies: list[str] | None = None,
+) -> tuple[pathlib.Path, dict]:
+    project_root = tmp_path
+    dep_dir = (project_root / dep_subdir).resolve()
+    dep_dir.mkdir(parents=True, exist_ok=True)
+    if uv_lock is not None:
+        (dep_dir / "uv.lock").write_text(uv_lock)
+    if pyproject is not None:
+        (dep_dir / "pyproject.toml").write_text(pyproject)
+    if requirements is not None:
+        (dep_dir / "requirements.txt").write_text(requirements)
+    config = project_root / "langgraph.json"
+    config.write_text("{}")
+    config_json = {"dependencies": dependencies or [dep_subdir]}
+    return config, config_json
+
+
+def test_uv_lock_resolved_version_preferred(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        uv_lock='name = "google-adk"\nversion = "1.2.3"\n',
+        pyproject='dependencies = ["google-adk>=0.5"]',
+    )
+    assert find_tracked_packages(config, config_json) == ["google-adk:1.2.3"]
+
+
+def test_pyproject_specifier_used_when_no_lock(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        pyproject='dependencies = ["google-adk>=0.5,<2"]',
+    )
+    assert find_tracked_packages(config, config_json) == ["google-adk:>=0.5,<2"]
+
+
+def test_requirements_txt_specifier(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        requirements="google-adk==1.0.0\n",
+    )
+    assert find_tracked_packages(config, config_json) == ["google-adk:==1.0.0"]
+
+
+def test_bare_reference_records_unknown(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        requirements="google-adk\nother-pkg==1.0\n",
+    )
+    assert find_tracked_packages(config, config_json) == ["google-adk:unknown"]
+
+
+def test_extras_bracket_records_unknown(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        pyproject='dependencies = ["deployments-wrap-sdk[google-adk]>=0.0.1"]',
+    )
+    assert find_tracked_packages(config, config_json) == ["google-adk:unknown"]
+
+
+def test_no_match_returns_empty(tmp_path: pathlib.Path) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        pyproject='dependencies = ["langgraph>=0.2"]',
+    )
+    assert find_tracked_packages(config, config_json) == []
+
+
+def test_traversal_dep_path_is_skipped(tmp_path: pathlib.Path) -> None:
+    outside = tmp_path.parent / "outside-project"
+    outside.mkdir(exist_ok=True)
+    (outside / "uv.lock").write_text('name = "google-adk"\nversion = "9.9.9"\n')
+    project_root = tmp_path / "project"
+    project_root.mkdir()
+    config = project_root / "langgraph.json"
+    config.write_text("{}")
+    config_json = {"dependencies": ["../outside-project"]}
+    assert find_tracked_packages(config, config_json) == []
+
+
+def test_dep_paths_scanned_in_order(tmp_path: pathlib.Path) -> None:
+    project_root = tmp_path
+    (project_root / "first").mkdir()
+    (project_root / "second").mkdir()
+    (project_root / "second" / "uv.lock").write_text(
+        'name = "google-adk"\nversion = "2.0.0"\n'
+    )
+    config = project_root / "langgraph.json"
+    config.write_text("{}")
+    config_json = {"dependencies": ["first", "second"]}
+    assert find_tracked_packages(config, config_json) == ["google-adk:2.0.0"]
+
+
+def test_non_string_dep_entry_ignored(tmp_path: pathlib.Path) -> None:
+    project_root = tmp_path
+    config = project_root / "langgraph.json"
+    config.write_text("{}")
+    config_json = {"dependencies": [123, None]}
+    assert find_tracked_packages(config, config_json) == []
+
+
+def test_oversized_file_is_truncated_not_raised(tmp_path: pathlib.Path) -> None:
+    project_root = tmp_path
+    config = project_root / "langgraph.json"
+    config.write_text("{}")
+    # 6 MB of irrelevant content followed by the tracked-package marker —
+    # the read cap drops the marker, so nothing should be found.
+    padded = ("x" * (6 * 1024 * 1024)) + '\nname = "google-adk"\nversion = "1.0.0"\n'
+    (project_root / "uv.lock").write_text(padded)
+    assert find_tracked_packages(config, {"dependencies": ["."]}) == []
+
+
+@pytest.mark.parametrize("pkg", TRACKED_PACKAGES)
+def test_every_tracked_package_is_detectable(tmp_path: pathlib.Path, pkg: str) -> None:
+    config, config_json = _write_project(
+        tmp_path,
+        uv_lock=f'name = "{pkg}"\nversion = "1.0.0"\n',
+    )
+    assert find_tracked_packages(config, config_json) == [f"{pkg}:1.0.0"]

libs/cli/tests/unit_tests/test_deploy_helpers.py

@@ -1,6 +1,9 @@
 import base64
+import io
 import json
 import os
+import sys
+from unittest.mock import MagicMock
 
 import click
 import httpx
@@ -8,12 +11,16 @@ import pytest
 
 from langgraph_cli.deploy import (
     _call_host_backend_with_optional_tenant,
+    _create_host_backend_client,
     _docker_config_for_token,
+    _Emitter,
     _env_without_deployment_name,
     _parse_env_from_config,
     _resolve_env_path,
-    normalize_image_name,
+    _resolve_pushed_image_digest,
+    _smith_dashboard_base_url,
     normalize_image_tag,
+    normalize_name,
 )
 from langgraph_cli.host_backend import HostBackendClient, HostBackendError
 
@@ -40,30 +47,33 @@ class TestDockerConfigForToken:
             assert "gcr.io" in data["auths"]
 
 
-class TestNormalizeImageName:
+class TestNormalizeName:
     def test_simple_name(self):
-        assert normalize_image_name("myapp") == "myapp"
+        assert normalize_name("myapp") == "myapp"
 
     def test_uppercase_lowered(self):
-        assert normalize_image_name("MyApp") == "myapp"
+        assert normalize_name("MyApp") == "myapp"
 
     def test_special_chars_replaced(self):
-        assert normalize_image_name("my app!@#v2") == "my-app-v2"
+        assert normalize_name("my app!@#v2") == "my-app-v2"
 
-    def test_dots_and_hyphens_kept(self):
-        assert normalize_image_name("my-app.v2") == "my-app.v2"
+    def test_dots_replaced_with_hyphens(self):
+        assert normalize_name("my-app.v2") == "my-app-v2"
+
+    def test_underscores_replaced_with_hyphens(self):
+        assert normalize_name("simple_graph_name") == "simple-graph-name"
 
     def test_leading_trailing_stripped(self):
-        assert normalize_image_name("--my-app..") == "my-app"
+        assert normalize_name("--my-app..") == "my-app"
 
     def test_empty_string_returns_app(self):
-        assert normalize_image_name("") == "app"
+        assert normalize_name("") == "app"
 
     def test_none_returns_app(self):
-        assert normalize_image_name(None) == "app"
+        assert normalize_name(None) == "app"
 
     def test_all_invalid_chars_returns_app(self):
-        assert normalize_image_name("!!!") == "app"
+        assert normalize_name("!!!") == "app"
 
 
 class TestNormalizeImageTag:
@@ -271,3 +281,409 @@ class TestCallHostBackendWithOptionalTenant:
             _call_host_backend_with_optional_tenant(
                 client, lambda c: c.list_deployments()
             )
+
+    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)
+
+        requires_workspace = '{"detail":"requires workspace specification"}'
+        client = self._make_client(
+            lambda req: httpx.Response(403, text=requires_workspace)
+        )
+        with pytest.raises(click.ClickException, match="workspace"):
+            _call_host_backend_with_optional_tenant(
+                client, lambda c: c.list_deployments()
+            )
+
+
+# ---------------------------------------------------------------------------
+# _Emitter JSON mode
+# ---------------------------------------------------------------------------
+
+
+class TestEmitterJsonMode:
+    """Verify that _Emitter in json_mode writes valid JSON-lines to stdout."""
+
+    def _capture(self, fn):
+        """Run fn with stdout captured and return parsed JSON objects."""
+        buf = io.StringIO()
+        old = sys.stdout
+        sys.stdout = buf
+        try:
+            fn()
+        finally:
+            sys.stdout = old
+        lines = [line for line in buf.getvalue().splitlines() if line.strip()]
+        return [json.loads(line) for line in lines]
+
+    def test_step_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.step(1, "Building image"))
+        assert len(events) == 1
+        assert events[0]["event"] == "step"
+        assert events[0]["step"] == 1
+        assert events[0]["message"] == "Building image"
+
+    def test_info_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.info("All good"))
+        assert events[0]["event"] == "info"
+        assert events[0]["message"] == "All good"
+
+    def test_warn_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.warn("Careful"))
+        assert events[0]["event"] == "warn"
+
+    def test_error_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.error("Boom"))
+        assert events[0]["event"] == "error"
+        assert events[0]["message"] == "Boom"
+
+    def test_status_change_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.status_change("building", 12.345))
+        assert events[0]["event"] == "status_change"
+        assert events[0]["status"] == "building"
+        assert events[0]["elapsed_seconds"] == 12.3
+        assert events[0]["message"] == "building... (12s)"
+
+    def test_status_change_event_with_minutes(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.status_change("deploying", 95.0))
+        assert events[0]["message"] == "deploying... (1m 35s)"
+
+    def test_log_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.log("some output"))
+        assert events[0] == {"event": "log", "message": "some output"}
+
+    def test_status_url_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(
+            lambda: em.status_url("https://smith.langchain.com/deploy/123")
+        )
+        assert events[0]["event"] == "status_url"
+        assert events[0]["url"] == "https://smith.langchain.com/deploy/123"
+
+    def test_result_event_full(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(
+            lambda: em.result(
+                "succeeded",
+                deployment_id="dep-1",
+                url="https://app.example.com",
+                status_url="https://smith.langchain.com/deploy/dep-1",
+            )
+        )
+        assert events[0]["event"] == "result"
+        assert events[0]["status"] == "succeeded"
+        assert events[0]["deployment_id"] == "dep-1"
+        assert events[0]["message"] == "Deployment successful!"
+        assert events[0]["url"] == "https://app.example.com"
+        assert events[0]["status_url"] == "https://smith.langchain.com/deploy/dep-1"
+
+    def test_result_event_minimal(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.result("failed", deployment_id="dep-2"))
+        assert events[0]["event"] == "result"
+        assert events[0]["status"] == "failed"
+        assert events[0]["message"] == "Deployment failed"
+        assert "url" not in events[0]
+        assert "status_url" not in events[0]
+
+    def test_heartbeat_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.heartbeat("building", 30.789))
+        assert events[0]["event"] == "heartbeat"
+        assert events[0]["elapsed_seconds"] == 30.8
+        assert events[0]["message"] == "building... (30s)"
+
+    def test_heartbeat_silent_in_text_mode(self, capsys):
+        em = _Emitter(json_mode=False)
+        em.heartbeat("building", 10.0)
+        captured = capsys.readouterr()
+        assert captured.out == ""
+
+    def test_upload_progress_event(self):
+        em = _Emitter(json_mode=True)
+        events = self._capture(lambda: em.upload_progress(5.678, 42))
+        assert events[0]["event"] == "upload_progress"
+        assert events[0]["size_mb"] == 5.7
+        assert events[0]["pct"] == 42
+
+
+# ---------------------------------------------------------------------------
+# _Emitter text mode (non-json)
+# ---------------------------------------------------------------------------
+
+
+class TestEmitterTextMode:
+    """Verify that _Emitter in text mode uses click.echo/click.secho."""
+
+    def test_step_writes_text(self, capsys):
+        em = _Emitter(json_mode=False)
+        em.step(1, "Hello")
+        captured = capsys.readouterr()
+        assert "1. Hello" in captured.out
+
+    def test_log_writes_text(self, capsys):
+        em = _Emitter(json_mode=False)
+        em.log("my line")
+        captured = capsys.readouterr()
+        assert "my line" in captured.out
+
+    def test_result_succeeded_text(self, capsys):
+        em = _Emitter(json_mode=False)
+        em.result("succeeded", deployment_id="d1", url="https://app.test")
+        captured = capsys.readouterr()
+        lines = [line.strip() for line in captured.out.splitlines() if line.strip()]
+        assert "Deployment successful!" in lines
+        assert "URL: https://app.test" in lines
+
+
+# ---------------------------------------------------------------------------
+# --no-input guard on _create_host_backend_client
+# ---------------------------------------------------------------------------
+
+
+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)
+        monkeypatch.delenv("LANGCHAIN_API_KEY", raising=False)
+        monkeypatch.delenv("LANGGRAPH_HOST_API_KEY", raising=False)
+
+        with pytest.raises(click.ClickException, match="API key"):
+            _create_host_backend_client(
+                host_url="https://api.example.com",
+                api_key=None,
+                env_vars={},
+            )
+
+    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")
+
+        client = _create_host_backend_client(
+            host_url="https://api.example.com",
+            api_key=None,
+            env_vars={},
+        )
+        assert client is not None
+
+
+class TestSmithDashboardBaseUrl:
+    def test_none_returns_default(self):
+        assert _smith_dashboard_base_url(None) == "https://smith.langchain.com"
+
+    def test_empty_returns_default(self):
+        assert _smith_dashboard_base_url("") == "https://smith.langchain.com"
+
+    def test_prod_host_url(self):
+        assert (
+            _smith_dashboard_base_url("https://api.host.langchain.com")
+            == "https://smith.langchain.com"
+        )
+
+    def test_dev_host_url(self):
+        assert (
+            _smith_dashboard_base_url("https://dev.api.host.langchain.com")
+            == "https://dev.smith.langchain.com"
+        )
+
+    def test_eu_host_url(self):
+        assert (
+            _smith_dashboard_base_url("https://eu.api.host.langchain.com")
+            == "https://eu.smith.langchain.com"
+        )
+
+    def test_staging_host_url(self):
+        assert (
+            _smith_dashboard_base_url("https://staging.api.host.langchain.com")
+            == "https://staging.smith.langchain.com"
+        )
+
+    def test_localhost(self):
+        assert (
+            _smith_dashboard_base_url("http://localhost:8080")
+            == "http://localhost:8080"
+        )
+
+    def test_localhost_trailing_slash(self):
+        assert (
+            _smith_dashboard_base_url("http://localhost:8080/")
+            == "http://localhost:8080"
+        )
+
+    def test_127_0_0_1(self):
+        assert (
+            _smith_dashboard_base_url("http://127.0.0.1:3000")
+            == "http://127.0.0.1:3000"
+        )
+
+    def test_unknown_domain_returns_default(self):
+        assert (
+            _smith_dashboard_base_url("https://custom.example.com")
+            == "https://smith.langchain.com"
+        )
+
+
+class TestResolvePushedImageDigest:
+    """Tests for ``_resolve_pushed_image_digest`` — runner is mocked to
+    return the ``(stdout, stderr)`` tuple that ``subp_exec(collect=True)``
+    would produce.
+    """
+
+    @staticmethod
+    def _runner(stdout: str | None) -> MagicMock:
+        # Close the unawaited subp_exec coroutine to silence gc warnings.
+        runner = MagicMock()
+
+        def _run(coro, *args, **kwargs):
+            if hasattr(coro, "close"):
+                coro.close()
+            return (stdout, "")
+
+        runner.run.side_effect = _run
+        return runner
+
+    def test_happy_path_returns_digest(self):
+        runner = self._runner('["us-central1-docker.pkg.dev/proj/repo@sha256:abc123"]')
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image="us-central1-docker.pkg.dev/proj/repo:latest",
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == "us-central1-docker.pkg.dev/proj/repo@sha256:abc123"
+
+    def test_filters_to_matching_repo(self):
+        # Same image ID can hold digests for multiple repos — pick the one
+        # matching the just-pushed repo.
+        runner = self._runner(
+            json.dumps(
+                [
+                    "other-registry.example.com/some/repo@sha256:000000",
+                    "us-central1-docker.pkg.dev/proj/repo@sha256:abc123",
+                ]
+            )
+        )
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image="us-central1-docker.pkg.dev/proj/repo:v1.2.3",
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == "us-central1-docker.pkg.dev/proj/repo@sha256:abc123"
+
+    def test_empty_repodigests_falls_back_with_warning(self, mocker):
+        emitter = mocker.MagicMock()
+        mocker.patch("langgraph_cli.deploy._get_emitter", return_value=emitter)
+        runner = self._runner("[]")
+        remote = "us-central1-docker.pkg.dev/proj/repo:latest"
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image=remote,
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == remote
+        assert emitter.warn.called
+        assert remote in emitter.warn.call_args.args[0]
+
+    def test_null_repodigests_falls_back_with_warning(self, mocker):
+        # ``docker inspect --format '{{json .RepoDigests}}'`` emits ``null``
+        # when the field is absent.
+        emitter = mocker.MagicMock()
+        mocker.patch("langgraph_cli.deploy._get_emitter", return_value=emitter)
+        runner = self._runner("null")
+        remote = "us-central1-docker.pkg.dev/proj/repo:latest"
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image=remote,
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == remote
+        assert emitter.warn.called
+
+    def test_no_matching_repo_falls_back_with_warning(self, mocker):
+        # No matching digest for the pushed repo — warn and fall back to the
+        # tag-based ref rather than failing the deploy.
+        emitter = mocker.MagicMock()
+        mocker.patch("langgraph_cli.deploy._get_emitter", return_value=emitter)
+        runner = self._runner('["other-registry.example.com/some/repo@sha256:000000"]')
+        remote = "us-central1-docker.pkg.dev/proj/repo:latest"
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image=remote,
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == remote
+        assert emitter.warn.called
+
+    def test_registry_with_port_in_host(self):
+        # Only the rightmost ``:`` (the ``:latest`` tag) should be stripped.
+        runner = self._runner('["localhost:5000/repo@sha256:deadbeef"]')
+        out = _resolve_pushed_image_digest(
+            runner,
+            remote_image="localhost:5000/repo:latest",
+            docker_config_dir=None,
+            verbose=False,
+        )
+        assert out == "localhost:5000/repo@sha256:deadbeef"
+
+    @staticmethod
+    def _capturing_runner(stdout: str) -> tuple[MagicMock, dict]:
+        """Like ``_runner`` but exposes the coroutine for arg introspection.
+        Caller must close ``captured["coro"]``.
+        """
+        runner = MagicMock()
+        captured: dict = {}
+
+        def _run(coro, *args, **kwargs):
+            captured["coro"] = coro
+            return (stdout, "")
+
+        runner.run.side_effect = _run
+        return runner, captured
+
+    def test_passes_docker_config_dir(self):
+        runner, captured = self._capturing_runner(
+            '["us-central1-docker.pkg.dev/proj/repo@sha256:abc"]'
+        )
+        _resolve_pushed_image_digest(
+            runner,
+            remote_image="us-central1-docker.pkg.dev/proj/repo:latest",
+            docker_config_dir="/tmp/some-cfg",
+            verbose=False,
+        )
+        frame_locals = captured["coro"].cr_frame.f_locals
+        assert frame_locals["cmd"] == "docker"
+        assert "--config" in frame_locals["args"]
+        cfg_idx = frame_locals["args"].index("--config")
+        assert frame_locals["args"][cfg_idx + 1] == "/tmp/some-cfg"
+        captured["coro"].close()
+
+    def test_omits_docker_config_dir_when_none(self):
+        runner, captured = self._capturing_runner(
+            '["us-central1-docker.pkg.dev/proj/repo@sha256:abc"]'
+        )
+        _resolve_pushed_image_digest(
+            runner,
+            remote_image="us-central1-docker.pkg.dev/proj/repo:latest",
+            docker_config_dir=None,
+            verbose=False,
+        )
+        frame_locals = captured["coro"].cr_frame.f_locals
+        assert "--config" not in frame_locals["args"]
+        captured["coro"].close()

libs/cli/tests/unit_tests/test_host_backend.py

@@ -1,3 +1,5 @@
+import json
+
 import httpx
 import pytest
 
@@ -176,6 +178,69 @@ def test_update_deployment_no_secrets(client):
     assert result == {"ok": True}
 
 
+def _capturing_client(captured: dict) -> HostBackendClient:
+    def handler(req: httpx.Request) -> httpx.Response:
+        captured["body"] = req.read()
+        return httpx.Response(200, json={"ok": True})
+
+    c = HostBackendClient("https://api.example.com", "key")
+    c._client = httpx.Client(
+        base_url="https://api.example.com",
+        transport=httpx.MockTransport(handler),
+        headers={"X-Api-Key": "key", "Accept": "application/json"},
+        timeout=30,
+    )
+    return c
+
+
+def test_update_deployment_forwards_tracked_packages():
+    captured: dict = {}
+    c = _capturing_client(captured)
+    c.update_deployment(
+        "dep-123",
+        "image:latest",
+        tracked_packages=["google-adk:1.0.0"],
+    )
+    body = json.loads(captured["body"])
+    assert body["tracked_packages"] == ["google-adk:1.0.0"]
+    assert "tracked_packages" not in body["source_revision_config"]
+
+
+def test_update_deployment_omits_tracked_packages_when_absent():
+    captured: dict = {}
+    c = _capturing_client(captured)
+    c.update_deployment("dep-123", "image:latest")
+    body = json.loads(captured["body"])
+    assert "tracked_packages" not in body
+
+
+def test_update_deployment_internal_source_forwards_tracked_packages():
+    captured: dict = {}
+    c = _capturing_client(captured)
+    c.update_deployment_internal_source(
+        "dep-123",
+        source_tarball_path="path/to/tarball",
+        config_path="langgraph.json",
+        tracked_packages=["google-adk:>=0.5"],
+    )
+    body = json.loads(captured["body"])
+    assert body["tracked_packages"] == ["google-adk:>=0.5"]
+    assert body["source_revision_config"]["source_tarball_path"] == "path/to/tarball"
+    assert "tracked_packages" not in body["source_revision_config"]
+
+
+def test_update_deployment_internal_source_omits_tracked_packages_when_absent():
+    captured: dict = {}
+    c = _capturing_client(captured)
+    c.update_deployment_internal_source(
+        "dep-123",
+        source_tarball_path="path/to/tarball",
+        config_path="langgraph.json",
+    )
+    body = json.loads(captured["body"])
+    assert "tracked_packages" not in body
+
+
 def test_list_revisions(client):
     result = client.list_revisions("dep-123", limit=5)
     assert result == {"ok": True}

libs/cli/uv-examples/monorepo/apps/agent/pyproject.toml

@@ -7,6 +7,7 @@ dependencies = [
     "langgraph>=0.6.0,<2",
     "langchain-core>=0.2.14",
     "shared",
+    "langgraph-checkpoint-postgres>=3.0.0"
 ]
 
 [build-system]

libs/cli/uv-examples/monorepo/pyproject.toml

@@ -5,7 +5,8 @@ description = "uv workspace monorepo example for LangGraph CLI integration test"
 requires-python = ">=3.11"
 dependencies = [
     "langgraph>=0.6.0,<2",
-    "langchain-core>=0.2.14",
+    "langchain-core>=1.3.3",
+    "langgraph-checkpoint-postgres>=3.0.0"
 ]
 
 [tool.uv.workspace]

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

@@ -16,6 +16,7 @@ source = { editable = "apps/agent" }
 dependencies = [
     { name = "langchain-core" },
     { name = "langgraph" },
+    { name = "langgraph-checkpoint-postgres" },
     { name = "shared" },
 ]
 
@@ -23,6 +24,7 @@ dependencies = [
 requires-dist = [
     { name = "langchain-core", specifier = ">=0.2.14" },
     { name = "langgraph", specifier = ">=0.6.0,<2" },
+    { name = "langgraph-checkpoint-postgres", specifier = ">=3.0.0" },
     { name = "shared", editable = "libs/shared" },
 ]
 
@@ -215,10 +217,11 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.28"
+version = "1.3.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -227,9 +230,21 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d3/ae/8b74458fc3850ec3d150eb9f45e857db129dafa801fb5cf173dfc9f8bbf3/langchain_core-1.3.3.tar.gz", hash = "sha256:fa510a5db8efdc0c6ff41c0939fb5c00a0183c11f6b84233e892e3227ff69182", size = 915041, upload-time = "2026-05-05T19:02:36.612Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
+    { url = "https://files.pythonhosted.org/packages/1f/01/4771b7ab2af1d1aba5b710bd8f13d9225c609425214b357590a17b01be77/langchain_core-1.3.3-py3-none-any.whl", hash = "sha256:18aae8506f37da7f74398492279a7d6efcee4f8e23c4c41c7af080eeb7ef7bd1", size = 543857, upload-time = "2026-05-05T19:02:34.52Z" },
+]
+
+[[package]]
+name = "langchain-protocol"
+version = "0.0.15"
+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" }
+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" },
 ]
 
 [[package]]
@@ -262,6 +277,21 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/65/4c/09a4a0c42f5d2fc38d6c4d67884788eff7fd2cfdf367fdf7033de908b4c0/langgraph_checkpoint-4.0.1-py3-none-any.whl", hash = "sha256:e3adcd7a0e0166f3b48b8cf508ce0ea366e7420b5a73aa81289888727769b034", size = 50453, upload-time = "2026-02-27T21:06:14.293Z" },
 ]
 
+[[package]]
+name = "langgraph-checkpoint-postgres"
+version = "3.0.5"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "langgraph-checkpoint" },
+    { name = "orjson" },
+    { name = "psycopg" },
+    { name = "psycopg-pool" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/95/7a/8f439966643d32111248a225e6cb33a182d07c90de780c4dbfc1e0377832/langgraph_checkpoint_postgres-3.0.5.tar.gz", hash = "sha256:a8fd7278a63f4f849b5cbc7884a15ca8f41e7d5f7467d0a66b31e8c24492f7eb", size = 127856, upload-time = "2026-03-18T21:25:29.785Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/e8/87/b0f98b33a67204bca9d5619bcd9574222f6b025cf3c125eedcec9a50ecbc/langgraph_checkpoint_postgres-3.0.5-py3-none-any.whl", hash = "sha256:86d7040a88fd70087eaafb72251d796696a0a2d856168f5c11ef620771411552", size = 42907, upload-time = "2026-03-18T21:25:28.75Z" },
+]
+
 [[package]]
 name = "langgraph-prebuilt"
 version = "1.0.9"
@@ -290,7 +320,7 @@ wheels = [
 
 [[package]]
 name = "langsmith"
-version = "0.7.26"
+version = "0.8.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -303,9 +333,9 @@ dependencies = [
     { name = "xxhash" },
     { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a8/64/95f1f013531395f4e8ed73caeee780f65c7c58fe028cb543f8937b45611b/langsmith-0.8.0.tar.gz", hash = "sha256:59fe5b2a56bbbe14a08aa76691f84b49e8675dd21e11b57d80c6db8c08bac2e3", size = 4432996, upload-time = "2026-04-30T22:13:07.341Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
+    { url = "https://files.pythonhosted.org/packages/f3/e1/a4be2e696c9473bb53298df398237da5674704d781d4b748ed35aeef592a/langsmith-0.8.0-py3-none-any.whl", hash = "sha256:12cc4bc5622b835a6d841964d6034df3617bdb912dae0c1381fd0a68a9b3a3ef", size = 393268, upload-time = "2026-04-30T22:13:05.56Z" },
 ]
 
 [[package]]
@@ -433,6 +463,31 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/b7/b9/c538f279a4e237a006a2c98387d081e9eb060d203d8ed34467cc0f0b9b53/packaging-26.0-py3-none-any.whl", hash = "sha256:b36f1fef9334a5588b4166f8bcd26a14e521f2b55e6b9de3aaa80d3ff7a37529", size = 74366, upload-time = "2026-01-21T20:50:37.788Z" },
 ]
 
+[[package]]
+name = "psycopg"
+version = "3.3.4"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "tzdata", marker = "sys_platform == 'win32'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/db/2f/cb91e5502ec9de1de6f1b76cfbf69531932725361168bb06963620c77e2e/psycopg-3.3.4.tar.gz", hash = "sha256:e21207764952cff81b6b8bdacad9a3939f2793367fdac2987b3aac36a651b5bc", size = 165799, upload-time = "2026-05-01T23:31:55.179Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/5c/e0/7b3dee031daae7743609ce3c746565d4a3ed7c2c186479eb48e34e838c64/psycopg-3.3.4-py3-none-any.whl", hash = "sha256:b6bbc25ccf05c8fad3b061d9db2ef0909a555171b84b07f29458a447253d679a", size = 213001, upload-time = "2026-05-01T23:20:50.816Z" },
+]
+
+[[package]]
+name = "psycopg-pool"
+version = "3.3.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/90/82/7a23d26039827ecd4ebe93905651029ddd307c5182ad59296dfb6f67b528/psycopg_pool-3.3.1.tar.gz", hash = "sha256:b10b10b7a175d5cc1592147dc5b7eec8a9e0834eb3ed2c4a92c858e2f51eb63c", size = 31661, upload-time = "2026-05-01T23:31:59.809Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/37/ed/89c2c620af0e1660354cd8aabf9f5b21f911597ce22acb37c805d6c86bc8/psycopg_pool-3.3.1-py3-none-any.whl", hash = "sha256:2af5b432941c4c9ad5c87b3fa410aec910ec8f7c122855897983a06c45f2e4b5", size = 40023, upload-time = "2026-05-01T23:31:53.136Z" },
+]
+
 [[package]]
 name = "pydantic"
 version = "2.12.5"
@@ -663,12 +718,21 @@ wheels = [
 ]
 
 [[package]]
-name = "urllib3"
-version = "2.6.3"
+name = "tzdata"
+version = "2026.2"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/c7/24/5f1b3bdffd70275f6661c76461e25f024d5a38a46f04aaca912426a2b1d3/urllib3-2.6.3.tar.gz", hash = "sha256:1b62b6884944a57dbe321509ab94fd4d3b307075e0c2eae991ac71ee15ad38ed", size = 435556, upload-time = "2026-01-07T16:24:43.925Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/ba/19/1b9b0e29f30c6d35cb345486df41110984ea67ae69dddbc0e8a100999493/tzdata-2026.2.tar.gz", hash = "sha256:9173fde7d80d9018e02a662e168e5a2d04f87c41ea174b139fbef642eda62d10", size = 198254, upload-time = "2026-04-24T15:22:08.651Z" }
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+    { url = "https://files.pythonhosted.org/packages/ce/e4/dccd7f47c4b64213ac01ef921a1337ee6e30e8c6466046018326977efd95/tzdata-2026.2-py2.py3-none-any.whl", hash = "sha256:bbe9af844f658da81a5f95019480da3a89415801f6cc966806612cc7169bffe7", size = 349321, upload-time = "2026-04-24T15:22:05.876Z" },
+]
+
+[[package]]
+name = "urllib3"
+version = "2.7.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/53/0c/06f8b233b8fd13b9e5ee11424ef85419ba0d8ba0b3138bf360be2ff56953/urllib3-2.7.0.tar.gz", hash = "sha256:231e0ec3b63ceb14667c67be60f2f2c40a518cb38b03af60abc813da26505f4c", size = 433602, upload-time = "2026-05-07T16:13:18.596Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/7f/3e/5db95bcf282c52709639744ca2a8b149baccf648e39c8cc87553df9eae0c/urllib3-2.7.0-py3-none-any.whl", hash = "sha256:9fb4c81ebbb1ce9531cce37674bbc6f1360472bc18ca9a553ede278ef7276897", size = 131087, upload-time = "2026-05-07T16:13:17.151Z" },
 ]
 
 [[package]]
@@ -707,12 +771,14 @@ source = { virtual = "." }
 dependencies = [
     { name = "langchain-core" },
     { name = "langgraph" },
+    { name = "langgraph-checkpoint-postgres" },
 ]
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.2.14" },
+    { name = "langchain-core", specifier = ">=1.3.3" },
     { name = "langgraph", specifier = ">=0.6.0,<2" },
+    { name = "langgraph-checkpoint-postgres", specifier = ">=3.0.0" },
 ]
 
 [[package]]

libs/cli/uv-examples/simple/pyproject.toml

@@ -5,7 +5,7 @@ description = "Simple single-package uv example for LangGraph CLI integration te
 requires-python = ">=3.11"
 dependencies = [
     "langgraph>=0.6.0,<2",
-    "langchain-core>=0.2.14",
+    "langchain-core>=1.3.3",
 ]
 
 [build-system]

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

@@ -26,11 +26,11 @@ wheels = [
 
 [[package]]
 name = "certifi"
-version = "2026.2.25"
+version = "2026.5.20"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/af/2d/7bf41579a8986e348fa033a31cdd0e4121114f6bce2457e8876010b092dd/certifi-2026.2.25.tar.gz", hash = "sha256:e887ab5cee78ea814d3472169153c2d12cd43b14bd03329a39a9c6e2e80bfba7", size = 155029, upload-time = "2026-02-25T02:54:17.342Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f3/ce/ee2ecad540810a79593028e88299baeae54d346cc7a0d94b6199988b89b1/certifi-2026.5.20.tar.gz", hash = "sha256:69dea482ab64caa7b9f6aba1c6bf48bb6a5448d1c0f1b17ab42ad8c763a5344d", size = 135422, upload-time = "2026-05-20T11:46:50.073Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/59/8c/57e832b7af6d7c5abe66eb3fbe3a3a32f4d11ea23a1aa7131371035be991/certifi-2026.5.20-py3-none-any.whl", hash = "sha256:3c52e209ba0a4ad7aebe60436a4ab349c39e1e602e8c134221e546902ad25897", size = 134134, upload-time = "2026-05-20T11:46:48.578Z" },
 ]
 
 [[package]]
@@ -161,11 +161,11 @@ wheels = [
 
 [[package]]
 name = "idna"
-version = "3.11"
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 ]
 
 [[package]]

libs/langgraph/README.md

@@ -18,7 +18,7 @@
   <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" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
+  <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>
 
 <br>

libs/langgraph/langgraph/_internal/_config.py

@@ -29,6 +29,9 @@ from langgraph._internal._constants import (
 )
 
 DEFAULT_RECURSION_LIMIT = int(getenv("LANGGRAPH_DEFAULT_RECURSION_LIMIT", "10007"))
+DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT = int(
+    getenv("LANGGRAPH_DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT", "5000")
+)
 
 
 def recast_checkpoint_ns(ns: str) -> str:
@@ -76,6 +79,34 @@ def patch_checkpoint_map(
         return config
 
 
+def _merge_callbacks(base: Callbacks, new: Callbacks) -> Callbacks:
+    """Merge two callbacks values (None / list / BaseCallbackManager).
+
+    Six cases total (3 base types x 2 non-None new types).
+    """
+    if new is None:
+        return base
+    if base is None:
+        return new.copy() if isinstance(new, (list, BaseCallbackManager)) else new
+    if isinstance(new, list):
+        if isinstance(base, list):
+            return base + new
+        if isinstance(base, BaseCallbackManager):
+            mngr = base.copy()
+            for cb in new:
+                mngr.add_handler(cb, inherit=True)
+            return mngr
+    elif isinstance(new, BaseCallbackManager):
+        if isinstance(base, list):
+            mngr = new.copy()
+            for cb in base:
+                mngr.add_handler(cb, inherit=True)
+            return mngr
+        if isinstance(base, BaseCallbackManager):
+            return base.merge(new)
+    raise NotImplementedError(f"Unsupported callback types: {type(base)}, {type(new)}")
+
+
 def merge_configs(*configs: RunnableConfig | None) -> RunnableConfig:
     """Merge multiple configs into one.
 
@@ -110,34 +141,9 @@ def merge_configs(*configs: RunnableConfig | None) -> RunnableConfig:
                 else:
                     base[key] = value
             elif key == "callbacks":
-                base_callbacks = base.get("callbacks")
-                # callbacks can be either None, list[handler] or manager
-                # so merging two callbacks values has 6 cases
-                if isinstance(value, list):
-                    if base_callbacks is None:
-                        base["callbacks"] = value.copy()
-                    elif isinstance(base_callbacks, list):
-                        base["callbacks"] = base_callbacks + value
-                    else:
-                        # base_callbacks is a manager
-                        mngr = base_callbacks.copy()
-                        for callback in value:
-                            mngr.add_handler(callback, inherit=True)
-                        base["callbacks"] = mngr
-                elif isinstance(value, BaseCallbackManager):
-                    # value is a manager
-                    if base_callbacks is None:
-                        base["callbacks"] = value.copy()
-                    elif isinstance(base_callbacks, list):
-                        mngr = value.copy()
-                        for callback in base_callbacks:
-                            mngr.add_handler(callback, inherit=True)
-                        base["callbacks"] = mngr
-                    else:
-                        # base_callbacks is also a manager
-                        base["callbacks"] = base_callbacks.merge(value)
-                else:
-                    raise NotImplementedError
+                base["callbacks"] = _merge_callbacks(
+                    base.get("callbacks"), cast(Callbacks, value)
+                )
             elif key == "recursion_limit":
                 if config["recursion_limit"] != DEFAULT_RECURSION_LIMIT:
                     base["recursion_limit"] = config["recursion_limit"]
@@ -306,7 +312,40 @@ def ensure_config(*configs: RunnableConfig | None) -> RunnableConfig:
         for k, v in config.items():
             if _is_not_empty(v) and k in CONFIG_KEYS:
                 if k == CONF:
-                    empty[k] = cast(dict, v).copy()
+                    # Shallow-merge configurable dicts across configs so values
+                    # bound via with_config(...) (e.g. ls_agent_type) are
+                    # preserved when later configs (e.g. invoke-time) only
+                    # specify a subset of keys like thread_id.
+                    existing = empty.get(k)
+                    empty[k] = (
+                        {**cast(dict, existing), **cast(dict, v)}
+                        if existing
+                        else cast(dict, v).copy()
+                    )
+                elif k == "callbacks":
+                    empty["callbacks"] = _merge_callbacks(
+                        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()
+                    )
+                elif k == "tags":
+                    # Concatenate tags across configs so values bound via
+                    # with_config(...) are preserved when later configs
+                    # supply additional tags. Matches merge_configs.
+                    existing_tags: list[str] | None = empty.get("tags")
+                    empty["tags"] = (
+                        [*existing_tags, *cast(list, v)]
+                        if existing_tags
+                        else list(cast(list, v))
+                    )
                 else:
                     empty[k] = v  # type: ignore[literal-required]
         for k, v in config.items():
@@ -363,3 +402,17 @@ _PROPAGATE_TO_METADATA = frozenset(
         "graph_id",
     )
 )
+
+
+def filter_to_user_tags(tags: Sequence[str] | None) -> list[str] | None:
+    """Drop langgraph's internal `seq:step:*` bookkeeping tags.
+
+    `seq:step:N` tags are added internally to mark sequence steps; everything
+    else (user-supplied tags and any other framework tags) is kept. Returns the
+    surviving tags, or `None` if none remain. Shared by the `messages` and
+    `tasks` stream handlers so both surface the same tag set on their metadata.
+    """
+    if not tags:
+        return None
+    filtered = [t for t in tags if not t.startswith("seq:step")]
+    return filtered or None

libs/langgraph/langgraph/_internal/_constants.py

@@ -12,6 +12,9 @@ RESUME = sys.intern("__resume__")
 # for values passed to resume a node after an interrupt
 ERROR = sys.intern("__error__")
 # for errors raised by nodes
+ERROR_SOURCE_NODE = sys.intern("__error_source_node__")
+# failed source node name for node-level error handlers
+# value format in pending writes: `(task_id, ERROR_SOURCE_NODE, node_name: str)`
 NO_WRITES = sys.intern("__no_writes__")
 # marker to signal node didn't write anything
 TASKS = sys.intern("__pregel_tasks")
@@ -56,6 +59,8 @@ CONFIG_KEY_CHECKPOINT_NS = sys.intern("checkpoint_ns")
 # holds the current checkpoint_ns, "" for root graph
 CONFIG_KEY_NODE_FINISHED = sys.intern("__pregel_node_finished")
 # holds a callback to be called when a node is finished
+CONFIG_KEY_TIMED_ATTEMPT_OBSERVER = sys.intern("__pregel_timed_attempt_observer")
+# holds a callback to be called when an idle-timed node attempt starts or finishes
 CONFIG_KEY_SCRATCHPAD = sys.intern("__pregel_scratchpad")
 # holds a mutable dict for temporary storage scoped to the current task
 CONFIG_KEY_RUNNER_SUBMIT = sys.intern("__pregel_runner_submit")
@@ -66,6 +71,13 @@ CONFIG_KEY_RUNTIME = sys.intern("__pregel_runtime")
 # holds a `Runtime` instance with context, store, stream writer, etc.
 CONFIG_KEY_RESUME_MAP = sys.intern("__pregel_resume_map")
 # holds a mapping of task ns -> resume value for resuming tasks
+CONFIG_KEY_STREAM_MESSAGES_V2 = sys.intern("__pregel_stream_messages_v2")
+# when True, attach StreamMessagesHandlerV2 so content-block (v2) events
+# flow through stream_mode="messages"; set by StreamingHandler only.
+CONFIG_KEY_NODE_ERROR = sys.intern("__pregel_node_error")
+# holds a `NodeError` (failed source node + exception) for the current
+# node-level error handler invocation, injected when handler signature
+# requests `error: NodeError`
 
 # --- Other constants ---
 PUSH = sys.intern("__pregel_push")
@@ -93,6 +105,7 @@ RESERVED = {
     INTERRUPT,
     RESUME,
     ERROR,
+    ERROR_SOURCE_NODE,
     NO_WRITES,
     # reserved config.configurable keys
     CONFIG_KEY_SEND,
@@ -106,7 +119,9 @@ RESERVED = {
     CONFIG_KEY_CHECKPOINT_MAP,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_NS,
+    CONFIG_KEY_TIMED_ATTEMPT_OBSERVER,
     CONFIG_KEY_RESUME_MAP,
+    CONFIG_KEY_STREAM_MESSAGES_V2,
     # other constants
     PUSH,
     PULL,

libs/langgraph/langgraph/_internal/_runnable.py

@@ -51,9 +51,11 @@ from langgraph._internal._config import (
 )
 from langgraph._internal._constants import (
     CONF,
+    CONFIG_KEY_NODE_ERROR,
     CONFIG_KEY_RUNTIME,
 )
 from langgraph._internal._typing import MISSING
+from langgraph.errors import NodeError
 from langgraph.types import StreamWriter
 
 try:
@@ -117,6 +119,19 @@ def set_config_context(
         ctx.run(_unset_config_context, config_token, run)
 
 
+def create_task_in_config_context(
+    coro_factory: Callable[[], Coroutine[Any, Any, Any]], config: RunnableConfig
+) -> asyncio.Task[Any]:
+    """Create an asyncio.Task that inherits `config` as the child runnable context.
+
+    `asyncio.create_task` snapshots the current contextvars onto the new task,
+    so calling `create_task` while the config context is set ensures the task
+    sees `config` via `var_child_runnable_config` and any tracing parent.
+    """
+    with set_config_context(config) as context:
+        return context.run(lambda: asyncio.create_task(coro_factory()))
+
+
 # Before Python 3.11 native StrEnum is not available
 class StrEnum(str, enum.Enum):
     """A string enum."""
@@ -181,6 +196,15 @@ KWARGS_CONFIG_KEYS: tuple[tuple[str, tuple[Any, ...], str, Any], ...] = (
         "N/A",
         inspect.Parameter.empty,
     ),
+    (
+        "error",
+        (NodeError, "NodeError"),
+        # we never hit this block, we read directly from configurable
+        "N/A",
+        # default to None so non-handler nodes that happen to type a parameter
+        # `error: NodeError` don't blow up; handlers always receive a NodeError.
+        None,
+    ),
 )
 """List of kwargs that can be passed to functions, and their corresponding
 config keys, default values and type annotations.
@@ -354,6 +378,8 @@ class RunnableCallable(Runnable):
             kw_value: Any = MISSING
             if kw == "config":
                 kw_value = config
+            elif kw == "error":
+                kw_value = config.get(CONF, {}).get(CONFIG_KEY_NODE_ERROR, MISSING)
             elif runtime:
                 if kw == "runtime":
                     kw_value = runtime
@@ -426,6 +452,8 @@ class RunnableCallable(Runnable):
             kw_value: Any = MISSING
             if kw == "config":
                 kw_value = config
+            elif kw == "error":
+                kw_value = config.get(CONF, {}).get(CONFIG_KEY_NODE_ERROR, MISSING)
             elif runtime:
                 if kw == "runtime":
                     kw_value = runtime

libs/langgraph/langgraph/_internal/_timeout.py

@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+from datetime import timedelta
+from typing import Literal
+
+from langgraph.types import TimeoutPolicy
+
+_SYNC_TIMEOUT_PREFIX = (
+    "Node timeouts are only supported for async nodes because sync Python "
+    "execution cannot be safely cancelled in-process."
+)
+
+
+def coerce_timeout_policy(
+    value: float | timedelta | TimeoutPolicy | None,
+) -> TimeoutPolicy | None:
+    """Normalize a timeout value to positive-second policy fields."""
+    return TimeoutPolicy.coerce(value)
+
+
+def sync_timeout_unsupported(
+    name: str, *, kind: Literal["Node", "Task"] = "Node"
+) -> ValueError:
+    """Build the canonical error for using `timeout` with a sync target."""
+    return ValueError(f"{_SYNC_TIMEOUT_PREFIX} {kind} {name!r} is sync.")

libs/langgraph/langgraph/callbacks.py

@@ -245,15 +245,6 @@ class _GraphCallbackManager(BaseCallbackManager):
             run_id=run_id,
         )
 
-    def add_handler(
-        self,
-        handler: BaseCallbackHandler,
-        inherit: bool = True,  # noqa: FBT001,FBT002
-    ) -> None:
-        if not isinstance(handler, GraphCallbackHandler):
-            raise TypeError("handlers must inherit GraphCallbackHandler")
-        super().add_handler(handler, inherit=inherit)
-
     def copy(
         self,
         *,
@@ -321,15 +312,6 @@ class _AsyncGraphCallbackManager(BaseCallbackManager):
             run_id=run_id,
         )
 
-    def add_handler(
-        self,
-        handler: BaseCallbackHandler,
-        inherit: bool = True,  # noqa: FBT001,FBT002
-    ) -> None:
-        if not isinstance(handler, GraphCallbackHandler):
-            raise TypeError("handlers must inherit GraphCallbackHandler")
-        super().add_handler(handler, inherit=inherit)
-
     def copy(
         self,
         *,

libs/langgraph/langgraph/channels/__init__.py

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

libs/langgraph/langgraph/channels/binop.py

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

libs/langgraph/langgraph/channels/delta.py

@@ -0,0 +1,204 @@
+from __future__ import annotations
+
+import collections.abc
+import copy as _copy
+from collections.abc import Callable, Sequence
+from typing import Any, Generic
+
+from langgraph.checkpoint.base import PendingWrite
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from typing_extensions import Self
+
+from langgraph._internal._typing import MISSING
+from langgraph.channels.base import BaseChannel, Value
+from langgraph.channels.binop import _get_overwrite, _operators_equal, _strip_extras
+from langgraph.errors import (
+    EmptyChannelError,
+    ErrorCode,
+    InvalidUpdateError,
+    create_error_message,
+)
+
+__all__ = ("DeltaChannel",)
+
+
+class DeltaChannel(Generic[Value], BaseChannel[Any, Any, Any]):
+    """Reducer channel that stores only a sentinel in checkpoint blobs and
+    reconstructs state by replaying ancestor writes through the reducer.
+
+    !!! warning "Beta"
+
+        `DeltaChannel` is in beta. The API and on-disk representation may
+        change in future releases. Threads written with `DeltaChannel` today
+        are expected to remain readable, but the surrounding contract
+        (`BaseCheckpointSaver.get_delta_channel_history`, the
+        `_DeltaSnapshot` blob shape, the `counters_since_delta_snapshot`
+        metadata field) is not yet stable.
+
+    The reducer receives the current accumulated value and a batch of writes
+    in one call: `reducer(state, [write1, write2, ...]) -> new_state`.
+
+    Reducers must be deterministic and batching-invariant (associative across
+    folds): applying two consecutive write batches separately must produce the
+    same state as applying their concatenation once:
+
+        reducer(reducer(state, xs), ys) == reducer(state, xs + ys)
+
+    This lets LangGraph replay checkpointed writes in larger batches than they
+    were originally produced without changing reconstructed state.
+
+    Snapshot cadence is driven by two counters: per-channel update count and
+    total supersteps since last snapshot. `create_checkpoint` writes a full
+    `_DeltaSnapshot` blob when EITHER the update count reaches
+    `snapshot_frequency` OR the supersteps count reaches the system-wide
+    `DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT` bound (default 5000), bounding
+    replay depth even for channels that stop receiving writes.
+
+    Parameters:
+        reducer: `(state, list[writes]) -> new_state`. Must be deterministic
+            and batching-invariant as described above.
+        typ: The value type (e.g. `list`, `dict`). Inferred automatically
+            from the outer type when used inside `Annotated[T, DeltaChannel(...)]`.
+        snapshot_frequency: Every Nth update to this channel writes a snapshot
+            blob (default `1000`). Must be a positive int.
+    """
+
+    __slots__ = ("value", "reducer", "snapshot_frequency")
+    value: Value | Any
+
+    def __init__(
+        self,
+        reducer: Callable[[Any, Sequence[Any]], Any],
+        typ: type[Value] | None = None,
+        *,
+        snapshot_frequency: int = 1000,
+    ) -> None:
+        if snapshot_frequency <= 0:
+            raise ValueError(
+                f"snapshot_frequency must be a positive int, got {snapshot_frequency}"
+            )
+        if typ is None:
+            typ = list  # type: ignore[assignment]  # placeholder; overridden by _is_field_channel
+        super().__init__(typ)
+        self.reducer = reducer
+        self.snapshot_frequency = snapshot_frequency
+        typ = _strip_extras(typ)
+        if typ in (collections.abc.Sequence, collections.abc.MutableSequence):
+            typ = list
+        if typ in (collections.abc.Set, collections.abc.MutableSet):
+            typ = set
+        if typ in (collections.abc.Mapping, collections.abc.MutableMapping):
+            typ = dict
+        self.typ = typ
+        self.value: Any = MISSING
+
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, DeltaChannel):
+            return False
+        if self.snapshot_frequency != other.snapshot_frequency:
+            return False
+        return _operators_equal(self.reducer, other.reducer)
+
+    @property
+    def ValueType(self) -> Any:
+        return self.typ
+
+    @property
+    def UpdateType(self) -> Any:
+        return self.typ
+
+    def copy(self) -> Self:
+        new = self.__class__(
+            self.reducer, self.typ, snapshot_frequency=self.snapshot_frequency
+        )
+        new.key = self.key
+        new.value = self.value if self.value is MISSING else _copy.copy(self.value)
+        return new
+
+    def from_checkpoint(self, checkpoint: Any) -> Self:
+        """Initialize from a stored blob.
+
+        Blob types:
+          * `MISSING`: start empty; caller replays writes.
+          * `_DeltaSnapshot(value)`: restore value directly from snapshot.
+          * plain value (migration from old `BinaryOperatorAggregate` blobs):
+            use directly.
+        """
+        new = self.__class__(
+            self.reducer, self.typ, snapshot_frequency=self.snapshot_frequency
+        )
+        new.key = self.key
+        if checkpoint is MISSING:
+            new.value = self.typ()
+        elif isinstance(checkpoint, _DeltaSnapshot):
+            new.value = checkpoint.value
+        else:
+            new.value = checkpoint
+        return new
+
+    def replay_writes(self, writes: Sequence[PendingWrite]) -> None:
+        """Apply ancestor writes oldest-to-newest via a single reducer call.
+
+        If any write is an Overwrite, the last one in the sequence acts as
+        the reset point: its value becomes the new base and only writes
+        after it are passed to the reducer.
+        """
+        values = [v for _, _, v in writes]
+        if not values:
+            return
+        base = self.value
+        start = 0
+        for i, v in enumerate(values):
+            is_ow, ow_value = _get_overwrite(v)
+            if is_ow:
+                base = _copy.copy(ow_value) if ow_value is not None else self.typ()
+                start = i + 1
+        remaining = values[start:]
+        self.value = self.reducer(base, remaining) if remaining else base
+
+    def update(self, values: Sequence[Any]) -> bool:
+        if not values:
+            return False
+        overwrite_idx: int | None = None
+        for i, v in enumerate(values):
+            is_ow, _ = _get_overwrite(v)
+            if is_ow:
+                if overwrite_idx is not None:
+                    msg = create_error_message(
+                        message="Can receive only one Overwrite value per super-step.",
+                        error_code=ErrorCode.INVALID_CONCURRENT_GRAPH_UPDATE,
+                    )
+                    raise InvalidUpdateError(msg)
+                overwrite_idx = i
+        if overwrite_idx is not None:
+            _, overwrite_value = _get_overwrite(values[overwrite_idx])
+            base = (
+                _copy.copy(overwrite_value)
+                if overwrite_value is not None
+                else self.typ()
+            )
+            remaining = [v for i, v in enumerate(values) if i != overwrite_idx]
+            self.value = self.reducer(base, remaining) if remaining else base
+            return True
+        base = self.typ() if self.value is MISSING else self.value
+        self.value = self.reducer(base, list(values))
+        return True
+
+    def get(self) -> Any:
+        if self.value is MISSING:
+            raise EmptyChannelError()
+        return self.value
+
+    def is_available(self) -> bool:
+        return self.value is not MISSING
+
+    def checkpoint(self) -> Any:
+        """Return stored representation: always `MISSING`.
+
+        Snapshot decisions live in `create_checkpoint` (which has the channel
+        version) and write `_DeltaSnapshot(ch.get())` directly into
+        `channel_values`. For non-snapshot steps the channel does not appear
+        in `channel_values`; reconstruction walks ancestor writes via the
+        saver's `get_delta_channel_history`.
+        """
+        return MISSING

libs/langgraph/langgraph/errors.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
 from collections.abc import Sequence
+from dataclasses import dataclass
 from enum import Enum
-from typing import Any
+from typing import Any, Literal
 from warnings import warn
 
 # EmptyChannelError is re-exported from langgraph.channels.base
@@ -15,11 +16,15 @@ from langgraph.warnings import LangGraphDeprecatedSinceV10
 __all__ = (
     "EmptyChannelError",
     "ErrorCode",
+    "GraphDrained",
     "GraphRecursionError",
     "InvalidUpdateError",
     "GraphBubbleUp",
     "GraphInterrupt",
+    "NodeCancelledError",
+    "NodeError",
     "NodeInterrupt",
+    "NodeTimeoutError",
     "ParentCommand",
     "EmptyInputError",
     "TaskNotFound",
@@ -42,6 +47,23 @@ def create_error_message(*, message: str, error_code: ErrorCode) -> str:
     )
 
 
+class GraphBubbleUp(Exception):
+    pass
+
+
+class GraphDrained(GraphBubbleUp):
+    """Raised when a graph run exits early due to a drain request.
+
+    This indicates the graph stopped cooperatively at a superstep boundary
+    because `RunControl.request_drain()` was called (e.g., in response to
+    SIGTERM). The checkpoint is saved and the run can be resumed later.
+    """
+
+    def __init__(self, reason: str = "shutdown") -> None:
+        self.reason = reason
+        super().__init__(f"Graph drained: {reason}")
+
+
 class GraphRecursionError(RecursionError):
     """Raised when the graph has exhausted the maximum number of steps.
 
@@ -77,10 +99,6 @@ class InvalidUpdateError(Exception):
     pass
 
 
-class GraphBubbleUp(Exception):
-    pass
-
-
 class GraphInterrupt(GraphBubbleUp):
     """Raised when a subgraph is interrupted, suppressed by the root graph.
     Never raised directly, or surfaced to the user."""
@@ -125,3 +143,99 @@ class TaskNotFound(Exception):
     """Raised when the executor is unable to find a task (for distributed mode)."""
 
     pass
+
+
+@dataclass(frozen=True, slots=True)
+class NodeError:
+    """Failure context passed to a node-level error handler.
+
+    Inject by adding a parameter typed `NodeError` to a handler registered via
+    `StateGraph.add_node(..., error_handler=...)`:
+
+    ```python
+    def handler(state: State, error: NodeError) -> Command:
+        return Command(update={"status": f"recovered from {error.node}: {error.error}"})
+    ```
+    """
+
+    node: str
+    """Name of the node whose execution failed."""
+
+    error: BaseException
+    """Exception raised by the failed node."""
+
+
+class NodeCancelledError(Exception):
+    """Raised when a node body raises ``asyncio.CancelledError`` itself.
+
+    ``asyncio.CancelledError`` is a ``BaseException`` and the pregel runner
+    treats cancelled task futures as silent tear-down (e.g. when it stops
+    sibling tasks after a peer fails). That is the correct behaviour for
+    *framework-initiated* cancellation, but a user node that raises
+    ``asyncio.CancelledError`` from its own body should surface as a node
+    failure, the same way any other exception would.
+
+    The retry layer converts user-raised ``asyncio.CancelledError`` into this
+    type so it flows through the normal error path and the run reports as
+    ``error`` instead of silently succeeding.
+    """
+
+    node: str
+
+    def __init__(self, node: str, message: str | None = None) -> None:
+        super().__init__(message or f"Node {node!r} raised asyncio.CancelledError")
+        self.node = node
+
+
+class NodeTimeoutError(Exception):
+    """Raised when a node invocation exceeds one of its configured timeouts.
+
+    Does **not** inherit from the built-in `TimeoutError` (a subclass of
+    `OSError`) so that the default `RetryPolicy` treats it as retryable.
+
+    Both `idle_timeout` and `run_timeout` reflect the configured policy at the
+    time of the failure (each is `None` if not configured). `kind` and
+    `timeout` identify which one fired.
+    """
+
+    node: str
+    timeout: float
+    run_timeout: float | None
+    idle_timeout: float | None
+    elapsed: float
+    kind: Literal["idle", "run"]
+
+    def __init__(
+        self,
+        node: str,
+        elapsed: float,
+        *,
+        kind: Literal["idle", "run"],
+        idle_timeout: float | None = None,
+        run_timeout: float | None = None,
+    ) -> None:
+        if kind == "idle":
+            if idle_timeout is None:
+                raise ValueError("idle_timeout is required when kind='idle'")
+            message = (
+                f"Node '{node}' exceeded its idle timeout of "
+                f"{idle_timeout:.3f}s without making progress "
+                f"(elapsed: {elapsed:.3f}s)."
+            )
+            self.timeout = idle_timeout
+        elif kind == "run":
+            if run_timeout is None:
+                raise ValueError("run_timeout is required when kind='run'")
+            message = (
+                f"Node '{node}' exceeded its run timeout of "
+                f"{run_timeout:.3f}s (elapsed: {elapsed:.3f}s)."
+            )
+            self.timeout = run_timeout
+        else:
+            raise ValueError("kind must be 'idle' or 'run'")
+        super().__init__(message)
+        self.node = node
+        self.elapsed = elapsed
+        self.kind = kind
+        self.idle_timeout = idle_timeout
+        self.run_timeout = run_timeout

libs/langgraph/langgraph/func/__init__.py

@@ -5,6 +5,7 @@ import inspect
 import warnings
 from collections.abc import Awaitable, Callable, Sequence
 from dataclasses import dataclass
+from datetime import timedelta
 from typing import (
     Any,
     Generic,
@@ -22,6 +23,11 @@ from typing_extensions import Unpack
 
 from langgraph._internal import _serde
 from langgraph._internal._constants import CACHE_NS_WRITES, PREVIOUS
+from langgraph._internal._runnable import is_async_callable
+from langgraph._internal._timeout import (
+    coerce_timeout_policy,
+    sync_timeout_unsupported,
+)
 from langgraph._internal._typing import MISSING, DeprecatedKwargs
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue
@@ -31,13 +37,19 @@ from langgraph.pregel._call import (
     P,
     SyncAsyncFuture,
     T,
-    call,
+    _call_with_options,
     get_runnable_for_entrypoint,
     identifier,
 )
 from langgraph.pregel._read import PregelNode
 from langgraph.pregel._write import ChannelWrite, ChannelWriteEntry
-from langgraph.types import _DC_KWARGS, CachePolicy, RetryPolicy, StreamMode
+from langgraph.types import (
+    _DC_KWARGS,
+    CachePolicy,
+    RetryPolicy,
+    StreamMode,
+    TimeoutPolicy,
+)
 from langgraph.typing import ContextT
 from langgraph.warnings import LangGraphDeprecatedSinceV05, LangGraphDeprecatedSinceV10
 
@@ -51,6 +63,7 @@ class _TaskFunction(Generic[P, T]):
         *,
         retry_policy: Sequence[RetryPolicy],
         cache_policy: CachePolicy[Callable[P, str | bytes]] | None = None,
+        timeout: TimeoutPolicy | None = None,
         name: str | None = None,
     ) -> None:
         if name is not None:
@@ -67,15 +80,17 @@ class _TaskFunction(Generic[P, T]):
         self.func = func
         self.retry_policy = retry_policy
         self.cache_policy = cache_policy
+        self.timeout = timeout
         functools.update_wrapper(self, func)
 
     def __call__(self, *args: P.args, **kwargs: P.kwargs) -> SyncAsyncFuture[T]:
-        return call(
+        return _call_with_options(
             self.func,
+            args,
+            kwargs,
             retry_policy=self.retry_policy,
             cache_policy=self.cache_policy,
-            *args,
-            **kwargs,
+            timeout=self.timeout,
         )
 
     def clear_cache(self, cache: BaseCache) -> None:
@@ -98,6 +113,7 @@ def task(
     name: str | None = None,
     retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
     cache_policy: CachePolicy[Callable[P, str | bytes]] | None = None,
+    timeout: float | timedelta | TimeoutPolicy | None = None,
     **kwargs: Unpack[DeprecatedKwargs],
 ) -> Callable[
     [Callable[P, Awaitable[T]] | Callable[P, T]],
@@ -119,6 +135,7 @@ def task(
     name: str | None = None,
     retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
     cache_policy: CachePolicy[Callable[P, str | bytes]] | None = None,
+    timeout: float | timedelta | TimeoutPolicy | None = None,
     **kwargs: Unpack[DeprecatedKwargs],
 ) -> (
     Callable[[Callable[P, Awaitable[T]] | Callable[P, T]], _TaskFunction[P, T]]
@@ -142,6 +159,14 @@ def task(
         name: An optional name for the task. If not provided, the function name will be used.
         retry_policy: An optional retry policy (or list of policies) to use for the task in case of a failure.
         cache_policy: An optional cache policy to use for the task. This allows caching of the task results.
+        timeout: Timeout for each task attempt. A number or `timedelta` is a hard
+            wall-clock cap and is not refreshed. Use `TimeoutPolicy` to configure
+            both a wall-clock `run_timeout` and an `idle_timeout` refreshed by
+            progress signals. For long-running work that doesn't naturally emit
+            progress, call `runtime.heartbeat()` from inside the task. When the
+            timeout fires, `NodeTimeoutError` is raised and the retry policy (if
+            any) decides whether to retry. Supported only for async tasks; sync
+            tasks cannot be safely cancelled in-process.
 
     Returns:
         A callable function when used as a decorator.
@@ -196,6 +221,7 @@ def task(
         )
         if retry_policy is None:
             retry_policy = retry  # type: ignore[assignment]
+    timeout_policy = coerce_timeout_policy(timeout)
 
     retry_policies: Sequence[RetryPolicy] = (
         ()
@@ -208,8 +234,15 @@ def task(
     def decorator(
         func: Callable[P, Awaitable[T]] | Callable[P, T],
     ) -> Callable[P, SyncAsyncFuture[T]]:
+        if timeout_policy is not None and not is_async_callable(func):
+            name_ = name or getattr(func, "__name__", func.__class__.__name__)
+            raise sync_timeout_unsupported(str(name_), kind="Task")
         return _TaskFunction(
-            func, retry_policy=retry_policies, cache_policy=cache_policy, name=name
+            func,
+            retry_policy=retry_policies,
+            cache_policy=cache_policy,
+            timeout=timeout_policy,
+            name=name,
         )
 
     if __func_or_none__ is not None:
@@ -268,6 +301,15 @@ class entrypoint(Generic[ContextT]):
             passed to the workflow.
         cache_policy: A cache policy to use for caching the results of the workflow.
         retry_policy: A retry policy (or list of policies) to use for the workflow in case of a failure.
+        timeout: Timeout for each workflow attempt. A number or `timedelta` is a
+            hard wall-clock cap and is not refreshed. Use `TimeoutPolicy` to
+            configure both a wall-clock `run_timeout` and an `idle_timeout`
+            refreshed by progress signals. For long-running work that doesn't
+            naturally emit progress, call `runtime.heartbeat()` from inside the
+            workflow. When the timeout fires, `NodeTimeoutError` is raised and
+            the retry policy (if any) decides whether to retry. Supported only
+            for async workflows; sync workflows cannot be safely cancelled
+            in-process.
 
     !!! warning "`config_schema` Deprecated"
         The `config_schema` parameter is deprecated in v0.6.0 and support will be removed in v2.0.0.
@@ -400,6 +442,7 @@ class entrypoint(Generic[ContextT]):
         context_schema: type[ContextT] | None = None,
         cache_policy: CachePolicy | None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> None:
         """Initialize the entrypoint decorator."""
@@ -426,6 +469,7 @@ class entrypoint(Generic[ContextT]):
         self.cache = cache
         self.cache_policy = cache_policy
         self.retry_policy = retry_policy
+        self.timeout = coerce_timeout_policy(timeout)
         self.context_schema = context_schema
 
     @dataclass(**_DC_KWARGS)
@@ -535,6 +579,7 @@ class entrypoint(Generic[ContextT]):
                     bound=bound,
                     triggers=[START],
                     channels=START,
+                    timeout=self.timeout,
                     writers=[
                         ChannelWrite(
                             [

libs/langgraph/langgraph/graph/_node.py

@@ -9,7 +9,7 @@ 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
+from langgraph.types import CachePolicy, RetryPolicy, StreamWriter, TimeoutPolicy
 from langgraph.typing import ContextT, NodeInputT, NodeInputT_contra
 
 
@@ -88,5 +88,8 @@ class StateNodeSpec(Generic[NodeInputT, ContextT]):
     input_schema: type[NodeInputT]
     retry_policy: RetryPolicy | Sequence[RetryPolicy] | None
     cache_policy: CachePolicy | None
+    is_error_handler: bool = False
+    error_handler_node: str | None = None
     ends: tuple[str, ...] | dict[str, str] | None = EMPTY_SEQ
     defer: bool = False
+    timeout: TimeoutPolicy | None = None

libs/langgraph/langgraph/graph/message.py

@@ -244,6 +244,71 @@ def add_messages(
     return merged
 
 
+def _messages_delta_reducer(
+    state: list[AnyMessage], writes: list[list[AnyMessage]]
+) -> list[AnyMessage]:
+    """**Experimental.** Batch reducer for use with `DeltaChannel`.
+
+    Processes all writes in one pass — dedup by ID, `RemoveMessage`
+    tombstoning — without calling `add_messages`.
+
+    This reducer is batching-invariant, as required by `DeltaChannel`:
+    `reducer(reducer(state, xs), ys) == reducer(state, xs + ys)`.
+
+    Raw dict / string / tuple inputs are coerced to typed `BaseMessage`
+    objects so that HTTP-driven graphs work without a separate coercion
+    step. This is not full `add_messages` parity — `REMOVE_ALL_MESSAGES`,
+    unknown-id `RemoveMessage` errors, missing-id UUID assignment, and
+    `BaseMessageChunk` conversion are not handled here.
+
+    Example::
+
+        from typing import Annotated
+        from langgraph.channels.delta import DeltaChannel
+        from langgraph.graph.message import _messages_delta_reducer
+
+        class State(TypedDict):
+            messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+    """
+
+    # Each write is either a list of message-likes or a single message-like
+    # (BaseMessage / dict / str / tuple). Only lists flatten; everything
+    # else is one message.
+    flat: list[Any] = []
+    for w in writes:
+        if isinstance(w, list):
+            flat.extend(w)
+        else:
+            flat.append(w)
+    # Steady state: the reducer's own output is already typed, so skip
+    # `convert_to_messages` on state when the first element is a BaseMessage.
+    # Only raw input (initial dicts, deserialized blobs) hits the slow path.
+    if state and isinstance(state[0], BaseMessage):
+        state_msgs = state
+    else:
+        state_msgs = cast("list[AnyMessage]", convert_to_messages(state))
+    msgs = cast("list[AnyMessage]", convert_to_messages(flat))
+
+    index: dict[str, int] = {
+        m.id: i for i, m in enumerate(state_msgs) if m.id is not None
+    }
+    result: list[AnyMessage | None] = list(state_msgs)
+    for msg in msgs:
+        mid = msg.id
+        if mid is None:
+            result.append(msg)
+        elif isinstance(msg, RemoveMessage):
+            if mid in index:
+                result[index[mid]] = None
+                del index[mid]
+        elif mid in index:
+            result[index[mid]] = msg
+        else:
+            index[mid] = len(result)
+            result.append(msg)
+    return [m for m in result if m is not None]
+
+
 @deprecated(
     "MessageGraph is deprecated in langgraph 1.0.0, to be removed in 2.0.0. Please use StateGraph with a `messages` key instead.",
     category=None,

libs/langgraph/langgraph/graph/state.py

@@ -6,7 +6,8 @@ import typing
 import warnings
 from collections import defaultdict
 from collections.abc import Awaitable, Callable, Hashable, Sequence
-from dataclasses import is_dataclass
+from dataclasses import dataclass, is_dataclass
+from datetime import timedelta
 from functools import partial
 from inspect import isclass, isfunction, ismethod, signature
 from types import FunctionType
@@ -45,9 +46,11 @@ from langgraph._internal._fields import (
 )
 from langgraph._internal._pydantic import create_model
 from langgraph._internal._runnable import coerce_to_runnable
+from langgraph._internal._timeout import coerce_timeout_policy
 from langgraph._internal._typing import EMPTY_SEQ, MISSING, DeprecatedKwargs
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.binop import BinaryOperatorAggregate
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.ephemeral_value import EphemeralValue
 from langgraph.channels.last_value import LastValue, LastValueAfterFinish
 from langgraph.channels.named_barrier_value import (
@@ -81,6 +84,7 @@ from langgraph.types import (
     Command,
     RetryPolicy,
     Send,
+    TimeoutPolicy,
     ensure_valid_checkpointer,
 )
 from langgraph.typing import ContextT, InputT, NodeInputT, OutputT, StateT
@@ -91,6 +95,17 @@ __all__ = ("StateGraph", "CompiledStateGraph")
 logger = logging.getLogger(__name__)
 
 _CHANNEL_BRANCH_TO = "branch:to:{}"
+_DEFAULT_ERROR_HANDLER_NODE = "__default_error_handler__"
+
+
+@dataclass(slots=True)
+class _NodeDefaults:
+    """Default node policies applied to every node at compile time."""
+
+    retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None
+    cache_policy: CachePolicy | None = None
+    error_handler: StateNode[Any, Any] | None = None
+    timeout: TimeoutPolicy | None = None
 
 
 def _warn_invalid_state_schema(schema: type[Any] | Any) -> None:
@@ -247,10 +262,77 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         self.output_schema = cast(type[OutputT], output_schema or state_schema)
         self.context_schema = context_schema
 
+        self._node_defaults: _NodeDefaults = _NodeDefaults()
+
         self._add_schema(self.state_schema)
         self._add_schema(self.input_schema, allow_managed=False)
         self._add_schema(self.output_schema, allow_managed=False)
 
+    def set_node_defaults(
+        self,
+        *,
+        retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
+        cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
+    ) -> Self:
+        """Set default node policies that apply to every node in this graph.
+
+        Per-node values passed to `add_node` always take precedence over these
+        defaults. Defaults are applied at `compile()` time. Policies set here
+        are **not** inherited by subgraphs.
+
+        `retry_policy` and `timeout` defaults apply to **all** nodes,
+        including error-handler nodes. `cache_policy` and `error_handler`
+        defaults only apply to regular nodes -- caching error-handler results
+        is unsafe, and handlers must never catch themselves.
+
+        Args:
+            retry_policy: Default retry policy for nodes that don't specify
+                their own via `add_node(..., retry_policy=...)`. Also applies
+                to error-handler nodes.
+            cache_policy: Default cache policy for nodes that don't specify
+                their own via `add_node(..., cache_policy=...)`. Does **not**
+                apply to error-handler nodes.
+            error_handler: Default error handler invoked when any regular node
+                raises and does not have its own `error_handler` set via
+                `add_node`. The handler is **not** invoked when an
+                error-handler node itself raises -- handler failures fail the
+                run.
+            timeout: Default timeout policy for nodes that don't specify their
+                own via `add_node(..., timeout=...)`. Also applies to
+                error-handler nodes. Accepts a `TimeoutPolicy`, a number of
+                seconds (`float`), or a `timedelta`.
+
+        Returns:
+            Self: The builder instance, for chaining.
+
+        Example:
+            ```python
+            graph = (
+                StateGraph(State)
+                .set_node_defaults(
+                    retry_policy=RetryPolicy(max_attempts=3),
+                    error_handler=my_fallback_handler,
+                )
+                .add_node("a", node_a)
+                .add_node("b", node_b, retry_policy=custom_retry)  # overrides default
+                .add_edge(START, "a")
+                .compile()
+            )
+            ```
+        """
+        defaults = self._node_defaults
+        if retry_policy is not None:
+            defaults.retry_policy = retry_policy
+        if cache_policy is not None:
+            defaults.cache_policy = cache_policy
+        if error_handler is not None:
+            defaults.error_handler = error_handler
+        if timeout is not None:
+            defaults.timeout = coerce_timeout_policy(timeout)
+        return self
+
     @property
     def _all_edges(self) -> set[tuple[str, str]]:
         return self.edges | {
@@ -299,7 +381,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         input_schema: None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is inferred as the state schema.
@@ -366,7 +450,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         input_schema: type[NodeInputT],
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph` where input schema is specified.
@@ -438,7 +524,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         input_schema: None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is inferred as the state schema.
@@ -505,7 +593,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         input_schema: type[NodeInputT],
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`, input schema is specified.
@@ -579,7 +669,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         input_schema: type[NodeInputT] | None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        error_handler: StateNode[Any, ContextT] | None = None,
         destinations: dict[str, str] | tuple[str, ...] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
         **kwargs: Unpack[DeprecatedKwargs],
     ) -> Self:
         """Add a new node to the `StateGraph`.
@@ -598,6 +690,7 @@ 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.
             destinations: Destinations that indicate where a node can route to.
 
                 Useful for edgeless graphs with nodes that return `Command` objects.
@@ -609,6 +702,14 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 !!! warning
 
                     This is only used for graph rendering and doesn't have any effect on the graph execution.
+            timeout: Timeout for each node attempt. A number or `timedelta` is
+                a hard wall-clock cap and is not refreshed. Use `TimeoutPolicy`
+                to configure both a wall-clock `run_timeout` and an
+                `idle_timeout` refreshed by progress signals. When exceeded, a
+                [`NodeTimeoutError`][langgraph.errors.NodeTimeoutError] is raised
+                and the retry policy (if any) decides whether to retry. Timeouts
+                are supported only for async nodes; sync nodes cannot be safely
+                cancelled in-process.
 
         Example:
             ```python
@@ -662,6 +763,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             )
             if input_schema is None:
                 input_schema = cast(type[NodeInputT] | None, input_)
+        timeout = coerce_timeout_policy(timeout)
 
         if not isinstance(node, str):
             action = node
@@ -748,6 +850,25 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         if destinations is not None:
             ends = destinations
 
+        resolved_input_schema: type[Any] = (
+            input_schema or inferred_input_schema or self.state_schema
+        )
+        handler_node_name: str | None = None
+        if error_handler is not None:
+            handler_node_name = f"__error_handler__{node}"
+            if handler_node_name in self.nodes:
+                raise ValueError(
+                    f"Auto-generated error handler node `{handler_node_name}` already exists."
+                )
+            self.nodes[handler_node_name] = StateNodeSpec[Any, ContextT](
+                coerce_to_runnable(error_handler, name=handler_node_name, trace=False),  # type: ignore[arg-type]
+                metadata=None,
+                input_schema=resolved_input_schema,
+                retry_policy=None,
+                cache_policy=None,
+                is_error_handler=True,
+            )
+
         if input_schema is not None:
             self.nodes[node] = StateNodeSpec[NodeInputT, ContextT](
                 coerce_to_runnable(action, name=node, trace=False),  # type: ignore[arg-type]
@@ -755,8 +876,10 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 input_schema=input_schema,
                 retry_policy=retry_policy,
                 cache_policy=cache_policy,
+                error_handler_node=handler_node_name,
                 ends=ends,
                 defer=defer,
+                timeout=timeout,
             )
         elif inferred_input_schema is not None:
             self.nodes[node] = StateNodeSpec(
@@ -765,8 +888,10 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 input_schema=inferred_input_schema,
                 retry_policy=retry_policy,
                 cache_policy=cache_policy,
+                error_handler_node=handler_node_name,
                 ends=ends,
                 defer=defer,
+                timeout=timeout,
             )
         else:
             self.nodes[node] = StateNodeSpec[StateT, ContextT](
@@ -775,8 +900,10 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 input_schema=self.state_schema,
                 retry_policy=retry_policy,
                 cache_policy=cache_policy,
+                error_handler_node=handler_node_name,
                 ends=ends,
                 defer=defer,
+                timeout=timeout,
             )
 
         input_schema = input_schema or inferred_input_schema
@@ -1031,7 +1158,6 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             for node in interrupt:
                 if node not in self.nodes:
                     raise ValueError(f"Interrupt node `{node}` not found")
-
         self.compiled = True
         return self
 
@@ -1045,6 +1171,7 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
         interrupt_after: All | list[str] | None = None,
         debug: bool = False,
         name: str | None = None,
+        transformers: Sequence[Callable[[tuple[str, ...]], Any]] | None = None,
     ) -> CompiledStateGraph[StateT, ContextT, InputT, OutputT]:
         """Compiles the `StateGraph` into a `CompiledStateGraph` object.
 
@@ -1077,11 +1204,19 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             interrupt_after: An optional list of node names to interrupt after.
             debug: A flag indicating whether to enable debug mode.
             name: The name to use for the compiled graph.
+            transformers: Optional sequence of `StreamTransformer` classes or
+                configured factories. Classes and factories are instantiated
+                per run whenever `stream_events(version="v3")` / `astream_events(version="v3")` is called and are
+                propagated to subgraph scopes. Custom factories should follow
+                the standard `StreamTransformer` constructor shape by
+                accepting `scope` as their first argument. Appended after the
+                built-in stream transformers.
 
         Returns:
             CompiledStateGraph: The compiled `StateGraph`.
         """
         checkpointer = ensure_valid_checkpointer(checkpointer)
+
         serde_allowlist: set[tuple[str, ...]] | None = None
         if _serde.STRICT_MSGPACK_ENABLED:
             schema_types: list[type[Any]] = [
@@ -1136,6 +1271,64 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
                 key for key, val in self.channels.items() if not is_managed_value(val)
             ]
         )
+        # Apply builder defaults to node specs. Per-node values always win.
+        # Error-handler routing and cache_policy are only assigned to regular
+        # nodes. Retry and timeout defaults also apply to error-handler nodes.
+        defaults = self._node_defaults
+        default_handler_name: str | None = None
+        if defaults.error_handler is not None:
+            if _DEFAULT_ERROR_HANDLER_NODE in self.nodes:
+                raise ValueError(
+                    f"Auto-generated default error handler node "
+                    f"`{_DEFAULT_ERROR_HANDLER_NODE}` already exists."
+                )
+            default_handler_name = _DEFAULT_ERROR_HANDLER_NODE
+            self.nodes[default_handler_name] = StateNodeSpec[Any, ContextT](
+                coerce_to_runnable(
+                    defaults.error_handler,  # type: ignore[arg-type]
+                    name=default_handler_name,
+                    trace=False,
+                ),
+                metadata=None,
+                input_schema=self.state_schema,
+                retry_policy=None,
+                cache_policy=None,
+                is_error_handler=True,
+            )
+
+        # Apply builder defaults to node specs. Per-node values always win.
+        for spec in self.nodes.values():
+            # error_handler: regular nodes only — handlers must never
+            # catch themselves or other handlers.
+            if (
+                not spec.is_error_handler
+                and default_handler_name is not None
+                and spec.error_handler_node is None
+            ):
+                spec.error_handler_node = default_handler_name
+            # retry: all nodes — handlers should be retried on transient
+            # failures just like regular nodes.
+            if defaults.retry_policy is not None and spec.retry_policy is None:
+                spec.retry_policy = defaults.retry_policy
+            # cache: regular nodes only — caching an error-handler result
+            # is unsafe because the input (failed-node state) may differ
+            # across failures even when the cache key matches.
+            if (
+                not spec.is_error_handler
+                and defaults.cache_policy is not None
+                and spec.cache_policy is None
+            ):
+                spec.cache_policy = defaults.cache_policy
+            # timeout: all nodes — a stuck handler should be cancelled the
+            # same way a stuck regular node would be.
+            if defaults.timeout is not None and spec.timeout is None:
+                spec.timeout = defaults.timeout
+
+        node_error_handler_map = {
+            node_name: spec.error_handler_node
+            for node_name, spec in self.nodes.items()
+            if not spec.is_error_handler and spec.error_handler_node is not None
+        }
 
         compiled = CompiledStateGraph[StateT, ContextT, InputT, OutputT](
             builder=self,
@@ -1158,7 +1351,9 @@ class StateGraph(Generic[StateT, ContextT, InputT, OutputT]):
             debug=debug,
             store=store,
             cache=cache,
+            node_error_handler_map=node_error_handler_map,
             name=name or "LangGraph",
+            stream_transformers=transformers,
         )
         compiled._serde_allowlist = serde_allowlist
 
@@ -1331,7 +1526,10 @@ class CompiledStateGraph(
                 metadata=node.metadata,
                 retry_policy=node.retry_policy,
                 cache_policy=node.cache_policy,
+                is_error_handler=node.is_error_handler,
+                error_handler_node=node.error_handler_node,
                 bound=node.runnable,  # type: ignore[arg-type]
+                timeout=node.timeout,
             )
         else:
             raise RuntimeError
@@ -1667,6 +1865,20 @@ def _is_field_channel(typ: type[Any]) -> BaseChannel | None:
         # Search through all annotated medata to find channel annotations
         for item in meta:
             if isinstance(item, BaseChannel):
+                if isinstance(item, DeltaChannel) and hasattr(typ, "__origin__"):
+                    origin = typ.__origin__
+                    # Unwrap parameterized Required[X]/NotRequired[X] to X
+                    # (e.g. Annotated[NotRequired[dict[...]], ...]).
+                    if hasattr(origin, "__origin__") and origin.__origin__ in (
+                        Required,
+                        NotRequired,
+                    ):
+                        origin = origin.__args__[0]
+                    item = item.__class__(
+                        item.reducer,
+                        origin,
+                        snapshot_frequency=item.snapshot_frequency,
+                    )
                 return item
             elif isclass(item) and issubclass(item, BaseChannel):
                 # ex, Annotated[int, EphemeralValue, SomeOtherAnnotation]

libs/langgraph/langgraph/pregel/_algo.py

@@ -39,6 +39,7 @@ from langgraph._internal._constants import (
     CONFIG_KEY_CHECKPOINT_MAP,
     CONFIG_KEY_CHECKPOINT_NS,
     CONFIG_KEY_CHECKPOINTER,
+    CONFIG_KEY_NODE_ERROR,
     CONFIG_KEY_READ,
     CONFIG_KEY_RESUME_MAP,
     CONFIG_KEY_RUNTIME,
@@ -47,6 +48,7 @@ from langgraph._internal._constants import (
     CONFIG_KEY_TASK_ID,
     CONFIG_KEY_THREAD_ID,
     ERROR,
+    ERROR_SOURCE_NODE,
     INTERRUPT,
     NO_WRITES,
     NS_END,
@@ -66,6 +68,7 @@ from langgraph.channels.base import BaseChannel
 from langgraph.channels.topic import Topic
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.constants import TAG_HIDDEN
+from langgraph.errors import NodeError
 from langgraph.managed.base import ManagedValueMapping
 from langgraph.pregel._call import get_runnable_for_task, identifier
 from langgraph.pregel._io import read_channels
@@ -80,6 +83,7 @@ from langgraph.types import (
     PregelTask,
     RetryPolicy,
     Send,
+    TimeoutPolicy,
 )
 
 GetNextVersion = Callable[[V | None, None], V]
@@ -114,13 +118,21 @@ class PregelTaskWrites(NamedTuple):
 
 
 class Call:
-    __slots__ = ("func", "input", "retry_policy", "cache_policy", "callbacks")
+    __slots__ = (
+        "func",
+        "input",
+        "retry_policy",
+        "cache_policy",
+        "callbacks",
+        "timeout",
+    )
 
     func: Callable
     input: tuple[tuple[Any, ...], dict[str, Any]]
     retry_policy: Sequence[RetryPolicy] | None
     cache_policy: CachePolicy | None
     callbacks: Callbacks
+    timeout: TimeoutPolicy | None
 
     def __init__(
         self,
@@ -130,12 +142,14 @@ class Call:
         retry_policy: Sequence[RetryPolicy] | None,
         cache_policy: CachePolicy | None,
         callbacks: Callbacks,
+        timeout: TimeoutPolicy | None = None,
     ) -> None:
         self.func = func
         self.input = input
         self.retry_policy = retry_policy
         self.cache_policy = cache_policy
         self.callbacks = callbacks
+        self.timeout = timeout
 
 
 def should_interrupt(
@@ -281,7 +295,15 @@ def apply_writes(
     pending_writes_by_channel: dict[str, list[Any]] = defaultdict(list)
     for task in tasks:
         for chan, val in task.writes:
-            if chan in (NO_WRITES, PUSH, RESUME, INTERRUPT, RETURN, ERROR):
+            if chan in (
+                NO_WRITES,
+                PUSH,
+                RESUME,
+                INTERRUPT,
+                RETURN,
+                ERROR,
+                ERROR_SOURCE_NODE,
+            ):
                 pass
             elif chan in channels:
                 pending_writes_by_channel[chan].append(val)
@@ -733,11 +755,48 @@ def prepare_single_task(
                         task_path[:3],
                         writers=proc.flat_writers,
                         subgraphs=proc.subgraphs,
+                        timeout=proc.timeout,
                     )
             else:
                 return PregelTask(task_id, name, task_path[:3])
 
 
+def _coerce_pending_error(value: Any) -> BaseException:
+    if isinstance(value, BaseException):
+        return value
+    return Exception(str(value))
+
+
+def _read_errors_from_pending_writes(
+    pending_writes: list[PendingWrite],
+) -> list[BaseException]:
+    errors: list[BaseException] = []
+    for _, channel, value in pending_writes:
+        if channel == ERROR:
+            errors.append(_coerce_pending_error(value))
+    return errors
+
+
+def _read_error_for_task_id_from_pending_writes(
+    pending_writes: list[PendingWrite], task_id: str
+) -> BaseException | None:
+    for pending_task_id, channel, value in reversed(pending_writes):
+        if pending_task_id == task_id and channel == ERROR:
+            return _coerce_pending_error(value)
+    return None
+
+
+def _read_error_source_node_from_pending_writes(
+    pending_writes: list[PendingWrite], task_id: str
+) -> str | None:
+    for pending_task_id, channel, value in reversed(pending_writes):
+        if pending_task_id == task_id and channel == ERROR_SOURCE_NODE:
+            if isinstance(value, str):
+                return value
+            return str(value)
+    return None
+
+
 def prepare_push_task_functional(
     task_path: tuple[str, tuple, int, str, Call],
     # (PUSH, parent task path, idx of PUSH write, id of parent task, Call)
@@ -870,6 +929,7 @@ def prepare_push_task_functional(
             cache_key,
             task_id,
             in_progress_task_path,
+            timeout=call.timeout,
         )
     else:
         return PregelTask(task_id, name, in_progress_task_path)
@@ -1041,11 +1101,153 @@ def prepare_push_task_send(
             translated_task_path,
             writers=proc.flat_writers,
             subgraphs=proc.subgraphs,
+            timeout=packet.timeout if packet.timeout is not None else proc.timeout,
         )
     else:
         return PregelTask(task_id, packet.node, translated_task_path)
 
 
+def prepare_node_error_handler_task(
+    failed_task: PregelExecutableTask,
+    *,
+    handler_node_name: str,
+    failed_error: BaseException,
+    checkpoint: Checkpoint,
+    pending_writes: list[PendingWrite],
+    processes: Mapping[str, PregelNode],
+    channels: Mapping[str, BaseChannel],
+    managed: ManagedValueMapping,
+    config: RunnableConfig,
+    step: int,
+    stop: int,
+    store: BaseStore | None = None,
+    checkpointer: BaseCheckpointSaver | None = None,
+    manager: None | ParentRunManager | AsyncParentRunManager = None,
+    cache_policy: CachePolicy | None = None,
+    retry_policy: Sequence[RetryPolicy] = (),
+) -> PregelExecutableTask | None:
+    """Prepare an immediate node-level error handler task for a failed task."""
+    if handler_node_name not in processes:
+        return None
+    proc = processes[handler_node_name]
+    proc_node = proc.node
+    if proc_node is None:
+        return None
+
+    checkpoint_id_bytes = binascii.unhexlify(checkpoint["id"].replace("-", ""))
+    task_id_func = _xxhash_str if checkpoint["v"] > 1 else _uuid5_str
+    configurable = config.get(CONF, {})
+    parent_ns = configurable.get(CONFIG_KEY_CHECKPOINT_NS, "")
+    checkpoint_ns = (
+        f"{parent_ns}{NS_SEP}{handler_node_name}" if parent_ns else handler_node_name
+    )
+    task_id = task_id_func(
+        checkpoint_id_bytes,
+        checkpoint_ns,
+        str(step),
+        handler_node_name,
+        PUSH,
+        "node_error_handler",
+        failed_task.id,
+    )
+    task_checkpoint_ns = f"{checkpoint_ns}:{task_id}"
+    translated_task_path = (*failed_task.path[:3], "node_error_handler", False)
+    metadata = {
+        "langgraph_step": step,
+        "langgraph_node": handler_node_name,
+        "langgraph_triggers": PUSH_TRIGGER,
+        "langgraph_path": translated_task_path,
+        "langgraph_checkpoint_ns": task_checkpoint_ns,
+    }
+    if proc.metadata:
+        metadata.update(proc.metadata)
+    writes: deque[tuple[str, Any]] = deque()
+
+    effective_retry_policy = proc.retry_policy or retry_policy
+    effective_cache_policy = proc.cache_policy or cache_policy
+    if effective_cache_policy:
+        args_key = effective_cache_policy.key_func(failed_task.input)
+        cache_key = CacheKey(
+            (
+                CACHE_NS_WRITES,
+                (identifier(proc) or "__dynamic__"),
+                handler_node_name,
+            ),
+            xxh3_128_hexdigest(
+                args_key.encode() if isinstance(args_key, str) else args_key
+            ),
+            effective_cache_policy.ttl,
+        )
+    else:
+        cache_key = None
+
+    scratchpad = _scratchpad(
+        config[CONF].get(CONFIG_KEY_SCRATCHPAD),
+        pending_writes,
+        task_id,
+        xxh3_128_hexdigest(task_checkpoint_ns.encode()),
+        config[CONF].get(CONFIG_KEY_RESUME_MAP),
+        step,
+        stop,
+    )
+    runtime = cast(Runtime, configurable.get(CONFIG_KEY_RUNTIME, DEFAULT_RUNTIME))
+    runtime = runtime.override(
+        store=store, previous=checkpoint["channel_values"].get(PREVIOUS, None)
+    )
+    additional_config: RunnableConfig = {
+        "metadata": metadata,
+        "tags": proc.tags,
+    }
+    return PregelExecutableTask(
+        handler_node_name,
+        failed_task.input,
+        proc_node,
+        writes,
+        patch_config(
+            merge_configs(config, additional_config),
+            run_name=handler_node_name,
+            callbacks=manager.get_child(f"graph:step:{step}") if manager else None,
+            configurable={
+                CONFIG_KEY_TASK_ID: task_id,
+                CONFIG_KEY_SEND: writes.extend,
+                CONFIG_KEY_READ: partial(
+                    local_read,
+                    scratchpad,
+                    channels,
+                    managed,
+                    PregelTaskWrites(
+                        translated_task_path,
+                        handler_node_name,
+                        writes,
+                        PUSH_TRIGGER,
+                    ),
+                ),
+                CONFIG_KEY_CHECKPOINTER: (
+                    checkpointer or configurable.get(CONFIG_KEY_CHECKPOINTER)
+                ),
+                CONFIG_KEY_CHECKPOINT_MAP: {
+                    **configurable.get(CONFIG_KEY_CHECKPOINT_MAP, {}),
+                    parent_ns: checkpoint["id"],
+                },
+                CONFIG_KEY_CHECKPOINT_ID: None,
+                CONFIG_KEY_CHECKPOINT_NS: task_checkpoint_ns,
+                CONFIG_KEY_SCRATCHPAD: scratchpad,
+                CONFIG_KEY_RUNTIME: runtime,
+                CONFIG_KEY_NODE_ERROR: NodeError(
+                    node=failed_task.name, error=failed_error
+                ),
+            },
+        ),
+        PUSH_TRIGGER,
+        effective_retry_policy,
+        cache_key,
+        task_id,
+        translated_task_path,
+        writers=proc.flat_writers,
+        subgraphs=proc.subgraphs,
+    )
+
+
 def checkpoint_null_version(
     checkpoint: Checkpoint,
 ) -> V | None:
@@ -1255,4 +1457,4 @@ def sanitize_untracked_values_in_send(
         for k, v in packet.arg.items()
         if not isinstance(channels.get(k), UntrackedValue)
     }
-    return Send(node=packet.node, arg=sanitized_arg)
+    return Send(node=packet.node, arg=sanitized_arg, timeout=packet.timeout)

libs/langgraph/langgraph/pregel/_call.py

@@ -8,6 +8,7 @@ import inspect
 import sys
 import types
 from collections.abc import Awaitable, Callable, Generator, Sequence
+from datetime import timedelta
 from typing import Any, Generic, TypeVar, cast
 
 from langchain_core.runnables import Runnable
@@ -20,9 +21,13 @@ from langgraph._internal._runnable import (
     is_async_callable,
     run_in_executor,
 )
+from langgraph._internal._timeout import (
+    coerce_timeout_policy,
+    sync_timeout_unsupported,
+)
 from langgraph.config import get_config
 from langgraph.pregel._write import ChannelWrite, ChannelWriteEntry
-from langgraph.types import CachePolicy, RetryPolicy
+from langgraph.types import CachePolicy, RetryPolicy, TimeoutPolicy
 
 ##
 # Utilities borrowed from cloudpickle.
@@ -255,8 +260,31 @@ def call(
     *args: Any,
     retry_policy: Sequence[RetryPolicy] | None = None,
     cache_policy: CachePolicy | None = None,
+    timeout: float | timedelta | TimeoutPolicy | None = None,
     **kwargs: Any,
 ) -> SyncAsyncFuture[T]:
+    return _call_with_options(
+        func,
+        args,
+        kwargs,
+        retry_policy=retry_policy,
+        cache_policy=cache_policy,
+        timeout=coerce_timeout_policy(timeout),
+    )
+
+
+def _call_with_options(
+    func: Callable[P, Awaitable[T]] | Callable[P, T],
+    args: tuple[Any, ...],
+    kwargs: dict[str, Any],
+    *,
+    retry_policy: Sequence[RetryPolicy] | None = None,
+    cache_policy: CachePolicy | None = None,
+    timeout: TimeoutPolicy | None = None,
+) -> SyncAsyncFuture[T]:
+    if timeout is not None and not is_async_callable(func):
+        name = getattr(func, "__name__", func.__class__.__name__)
+        raise sync_timeout_unsupported(name, kind="Task")
     config = get_config()
     impl = config[CONF][CONFIG_KEY_CALL]
     fut = impl(
@@ -265,5 +293,6 @@ def call(
         retry_policy=retry_policy,
         cache_policy=cache_policy,
         callbacks=config["callbacks"],
+        timeout=timeout,
     )
     return fut

libs/langgraph/langgraph/pregel/_checkpoint.py

@@ -1,17 +1,27 @@
 from __future__ import annotations
 
-from collections.abc import Mapping
+from collections.abc import Callable, Mapping
 from datetime import datetime, timezone
+from typing import Any, cast
 
-from langgraph.checkpoint.base import Checkpoint
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import (
+    BaseCheckpointSaver,
+    Checkpoint,
+)
 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._typing import MISSING
 from langgraph.channels.base import BaseChannel
+from langgraph.channels.delta import DeltaChannel
 from langgraph.managed.base import ManagedValueMapping, ManagedValueSpec
 
 LATEST_VERSION = 4
 
+GetNextVersion = Callable[[Any, None], Any]
+
 
 def empty_checkpoint() -> Checkpoint:
     return Checkpoint(
@@ -24,6 +34,30 @@ def empty_checkpoint() -> Checkpoint:
     )
 
 
+def delta_channels_to_snapshot(
+    channels: Mapping[str, BaseChannel],
+    counters_since_delta_snapshot: Mapping[str, tuple[int, int]],
+) -> set[str]:
+    """Return the set of DeltaChannel names that should snapshot now.
+
+    A channel snapshots when EITHER its accumulated update count reaches
+    `snapshot_frequency` OR the total supersteps since its last snapshot
+    reaches `DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`. This is a pure
+    predicate — no mutation.
+    """
+    result: set[str] = set()
+    for name, ch in channels.items():
+        if not isinstance(ch, DeltaChannel) or not ch.is_available():
+            continue
+        updates, supersteps = counters_since_delta_snapshot.get(name, (0, 0))
+        if (
+            updates >= ch.snapshot_frequency
+            or supersteps >= DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT
+        ):
+            result.add(name)
+    return result
+
+
 def create_checkpoint(
     checkpoint: Checkpoint,
     channels: Mapping[str, BaseChannel] | None,
@@ -31,35 +65,91 @@ def create_checkpoint(
     *,
     id: str | None = None,
     updated_channels: set[str] | None = None,
+    get_next_version: GetNextVersion | None = None,
+    channels_to_snapshot: set[str] | None = None,
 ) -> Checkpoint:
-    """Create a checkpoint for the given channels."""
+    """Build a new Checkpoint from the previous one and live channel state.
+
+    For each name in `channels_to_snapshot`, a `_DeltaSnapshot(value)` blob
+    is written into `channel_values[k]`. Other delta channels are omitted
+    from `channel_values` — the ancestor walk reconstructs their state
+    from `checkpoint_writes`. Callers compute the set via
+    `delta_channels_to_snapshot(channels, counters)`; defaults to empty
+    (no snapshots) when not provided.
+    """
     ts = datetime.now(timezone.utc).isoformat()
+    channels_to_snapshot = channels_to_snapshot or set()
     if channels is None:
         values = checkpoint["channel_values"]
+        channel_versions = checkpoint["channel_versions"]
     else:
         values = {}
+        channel_versions = dict(checkpoint["channel_versions"])
         for k in channels:
-            if k not in checkpoint["channel_versions"]:
+            if k not in channel_versions:
                 continue
-            v = channels[k].checkpoint()
-            if v is not MISSING:
-                values[k] = v
+            ch = channels[k]
+            if k in channels_to_snapshot:
+                # 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
+                # several supersteps, but the LAST superstep may not have
+                # written to this channel. In that case apply_writes()
+                # (in _algo.py) didn't bump this channel's version, so
+                # saver.put() wouldn't include it in new_versions and
+                # the snapshot blob would be silently dropped. The manual
+                # bump below closes the gap. In sync/async durability this
+                # branch is effectively dead code (the step that pushes
+                # the count to freq always writes the channel).
+                if get_next_version is not None and (
+                    updated_channels is None or k not in updated_channels
+                ):
+                    channel_versions[k] = get_next_version(channel_versions[k], None)
+                values[k] = _DeltaSnapshot(ch.get())
+            else:
+                v = ch.checkpoint()
+                if v is not MISSING:
+                    values[k] = v
     return Checkpoint(
         v=LATEST_VERSION,
         ts=ts,
         id=id or str(uuid6(clock_seq=step)),
         channel_values=values,
-        channel_versions=checkpoint["channel_versions"],
+        channel_versions=channel_versions,
         versions_seen=checkpoint["versions_seen"],
         updated_channels=None if updated_channels is None else sorted(updated_channels),
     )
 
 
+def _needs_replay(spec: BaseChannel, stored: object) -> bool:
+    """True if `spec` is a `DeltaChannel` and no value is stored at this
+    checkpoint, requiring an ancestor walk to reconstruct.
+
+    `_DeltaSnapshot` blobs and plain values (migration) resolve directly via
+    `from_checkpoint` — only absence (`MISSING`) triggers replay.
+    """
+    if not isinstance(spec, DeltaChannel):
+        return False
+    return stored is MISSING
+
+
 def channels_from_checkpoint(
     specs: Mapping[str, BaseChannel | ManagedValueSpec],
     checkpoint: Checkpoint,
+    *,
+    saver: BaseCheckpointSaver | None = None,
+    config: RunnableConfig | None = None,
 ) -> tuple[Mapping[str, BaseChannel], ManagedValueMapping]:
-    """Get channels from a checkpoint."""
+    """Hydrate channels from a checkpoint.
+
+    For most channels, `spec.from_checkpoint(checkpoint["channel_values"][k])`
+    is sufficient. `DeltaChannel` is the exception: when the channel is
+    absent from `channel_values`, an ancestor walk via
+    `saver.get_delta_channel_history` is required to find the nearest seed
+    (`_DeltaSnapshot` blob or pre-migration plain value) and accumulate
+    the writes between it and the target. All delta channels needing
+    replay are batched into a single saver call.
+    """
     channel_specs: dict[str, BaseChannel] = {}
     managed_specs: dict[str, ManagedValueSpec] = {}
     for k, v in specs.items():
@@ -67,13 +157,73 @@ def channels_from_checkpoint(
             channel_specs[k] = v
         else:
             managed_specs[k] = v
-    return (
-        {
-            k: v.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
-            for k, v in channel_specs.items()
-        },
-        managed_specs,
-    )
+
+    delta_channels: list[str] = [
+        k
+        for k, spec in channel_specs.items()
+        if _needs_replay(spec, checkpoint["channel_values"].get(k, MISSING))
+    ]
+    histories: Mapping[str, Any] = {}
+    if delta_channels and saver is not None and config is not None:
+        histories = saver.get_delta_channel_history(
+            config=config, channels=delta_channels
+        )
+
+    channels: dict[str, BaseChannel] = {}
+    for k, spec in channel_specs.items():
+        ch: BaseChannel
+        if k in histories:
+            delta_spec = cast(DeltaChannel, spec)
+            history = histories[k]
+            replay_ch = delta_spec.from_checkpoint(history.get("seed", MISSING))
+            replay_ch.replay_writes(history["writes"])
+            ch = replay_ch
+        else:
+            ch = spec.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
+        channels[k] = ch
+    return channels, managed_specs
+
+
+async def achannels_from_checkpoint(
+    specs: Mapping[str, BaseChannel | ManagedValueSpec],
+    checkpoint: Checkpoint,
+    *,
+    saver: BaseCheckpointSaver | None = None,
+    config: RunnableConfig | None = None,
+) -> tuple[Mapping[str, BaseChannel], ManagedValueMapping]:
+    """Async version of `channels_from_checkpoint`. See docstring there."""
+    channel_specs: dict[str, BaseChannel] = {}
+    managed_specs: dict[str, ManagedValueSpec] = {}
+    for k, v in specs.items():
+        if isinstance(v, BaseChannel):
+            channel_specs[k] = v
+        else:
+            managed_specs[k] = v
+
+    delta_channels: list[str] = [
+        k
+        for k, spec in channel_specs.items()
+        if _needs_replay(spec, checkpoint["channel_values"].get(k, MISSING))
+    ]
+    histories: Mapping[str, Any] = {}
+    if delta_channels and saver is not None and config is not None:
+        histories = await saver.aget_delta_channel_history(
+            config=config, channels=delta_channels
+        )
+
+    channels: dict[str, BaseChannel] = {}
+    for k, spec in channel_specs.items():
+        ch: BaseChannel
+        if k in histories:
+            delta_spec = cast(DeltaChannel, spec)
+            history = histories[k]
+            replay_ch = delta_spec.from_checkpoint(history.get("seed", MISSING))
+            replay_ch.replay_writes(history["writes"])
+            ch = replay_ch
+        else:
+            ch = spec.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
+        channels[k] = ch
+    return channels, managed_specs
 
 
 def copy_checkpoint(checkpoint: Checkpoint) -> Checkpoint:

libs/langgraph/langgraph/pregel/_loop.py

@@ -45,11 +45,13 @@ from langgraph._internal._constants import (
     CONFIG_KEY_REPLAY_STATE,
     CONFIG_KEY_RESUME_MAP,
     CONFIG_KEY_RESUMING,
+    CONFIG_KEY_RUNTIME,
     CONFIG_KEY_SCRATCHPAD,
     CONFIG_KEY_STREAM,
     CONFIG_KEY_TASK_ID,
     CONFIG_KEY_THREAD_ID,
     ERROR,
+    ERROR_SOURCE_NODE,
     INPUT,
     INTERRUPT,
     NS_END,
@@ -68,6 +70,7 @@ from langgraph.callbacks import (
     GraphResumeEvent,
 )
 from langgraph.channels.base import BaseChannel
+from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.constants import TAG_HIDDEN
 from langgraph.errors import (
@@ -86,15 +89,18 @@ from langgraph.pregel._algo import (
     checkpoint_null_version,
     increment,
     prepare_next_tasks,
+    prepare_node_error_handler_task,
     prepare_single_task,
     sanitize_untracked_values_in_send,
     should_interrupt,
     task_path_str,
 )
 from langgraph.pregel._checkpoint import (
+    achannels_from_checkpoint,
     channels_from_checkpoint,
     copy_checkpoint,
     create_checkpoint,
+    delta_channels_to_snapshot,
     empty_checkpoint,
 )
 from langgraph.pregel._executor import (
@@ -109,6 +115,7 @@ from langgraph.pregel._io import (
     map_output_values,
     read_channels,
 )
+from langgraph.pregel._messages import ensure_message_ids
 from langgraph.pregel._read import PregelNode
 from langgraph.pregel._utils import get_new_channel_versions, is_xxh3_128_hexdigest
 from langgraph.pregel.debug import (
@@ -117,6 +124,7 @@ from langgraph.pregel.debug import (
     map_debug_tasks,
 )
 from langgraph.pregel.protocol import StreamChunk, StreamProtocol
+from langgraph.runtime import RunControl, Runtime
 from langgraph.types import (
     All,
     CachePolicy,
@@ -188,6 +196,46 @@ class PregelLoop:
     _migrate_checkpoint: Callable[[Checkpoint], None] | None
     submit: Submit
     channels: Mapping[str, BaseChannel]
+    # Futures from `checkpointer.put_writes` calls that produced delta-channel
+    # writes. `_checkpointer_put_after_previous` drains this list (swap to a
+    # local `futs` then reset to `[]` and wait/gather) before putting the
+    # next checkpoint, so a checkpoint never becomes durable before the
+    # writes that produced it. Initialised to `[]` in both sync and async
+    # `__enter__`; stays `None` only when no checkpointer.
+    _delta_write_futs: list[Any] | None = None
+
+    # Same pattern as `_delta_write_futs` but for error-handler writes.
+    # When `put_writes` persists an ERROR_SOURCE_NODE marker, the future is
+    # appended here.  `schedule_error_handler` / `aschedule_error_handler`
+    # drain this list so the write is durable before the handler starts.
+    _error_handler_write_futs: list[Any] | None = None
+
+    # Exit-mode accumulator: every delta-channel write produced during this
+    # run (input writes from `_first` + per-superstep writes captured in
+    # `after_tick`). At exit, `_put_exit_delta_writes` filters out channels
+    # that will snapshot, then persists the rest under an anchor parent.
+    # `None` when not in exit mode (so the capture sites are no-ops).
+    # Each tuple is `(step, task_id, channel, value)` — `step` drives the
+    # synthetic step-prefixed task_id used to preserve chronological order
+    # under the saver's `ORDER BY task_id, idx` sorting.
+    _exit_delta_writes: list[tuple[int, str, str, Any]] | None = None
+
+    # 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`
+    # to the newly-saved checkpoint's id — by exit time the original parent
+    # config would otherwise be lost. `_put_exit_delta_writes` uses this:
+    # on resumed runs as the anchor for exit delta writes; on first runs
+    # to derive the lazy stub's config (its `checkpoint_id` is the
+    # synthetic-empty id we want the stub persisted under).
+    _initial_checkpoint_config: RunnableConfig
+
+    # True iff the saver actually returned a tuple at `__enter__`. False
+    # on the first-ever run for a thread (no parent persisted yet).
+    # `_put_exit_delta_writes` uses this to decide between anchoring on
+    # the existing parent (True) or creating a lazy stub (False).
+    _has_persisted_parent: bool = False
+
     managed: ManagedValueMapping
     checkpoint: Checkpoint
     checkpoint_id_saved: str
@@ -202,10 +250,12 @@ class PregelLoop:
         "input",
         "pending",
         "done",
+        "draining",
         "interrupt_before",
         "interrupt_after",
         "out_of_steps",
     ]
+    control: RunControl | None
     tasks: dict[str, PregelExecutableTask]
     output: None | dict[str, Any] | Any = None
     updated_channels: set[str] | None = None
@@ -313,6 +363,8 @@ class PregelLoop:
             else ()
         )
         self.prev_checkpoint_config = None
+        runtime = self.config[CONF].get(CONFIG_KEY_RUNTIME)
+        self.control = runtime.control if isinstance(runtime, Runtime) else None
 
     def _push_graph_lifecycle_event(
         self,
@@ -320,11 +372,16 @@ class PregelLoop:
         *,
         interrupts: tuple[Interrupt, ...] = (),
     ) -> None:
+        # drain status never reaches lifecycle events: tick() returns False
+        # before pushing, and interrupts are raised through GraphInterrupt
+        if self.status == "draining":
+            raise RuntimeError("Draining status cannot emit lifecycle events")
+        status = self.status
         if kind == "resume":
             self._graph_lifecycle_events.append(
                 GraphResumeEvent(
                     run_id=None,
-                    status=self.status,
+                    status=status,
                     checkpoint_id=self.checkpoint["id"],
                     checkpoint_ns=self.checkpoint_ns,
                 )
@@ -333,7 +390,7 @@ class PregelLoop:
             self._graph_lifecycle_events.append(
                 GraphInterruptEvent(
                     run_id=None,
-                    status=self.status,
+                    status=status,
                     checkpoint_id=self.checkpoint["id"],
                     checkpoint_ns=self.checkpoint_ns,
                     interrupts=interrupts,
@@ -391,6 +448,14 @@ class PregelLoop:
 
         # save writes
         self.checkpoint_pending_writes.extend((task_id, c, v) for c, v in writes)
+        # Assign stable IDs to any id=None BaseMessages in DeltaChannel writes
+        # before the background thread serialises them. Without this, reducers
+        # that assign IDs inside apply_writes() race with serialisation and
+        # store id=None, causing get_state() replays to produce a different UUID
+        # on every call.
+        for c, v in writes_to_save:
+            if isinstance(self.specs.get(c), DeltaChannel):
+                ensure_message_ids(v)
         if self.durability != "exit" and self.checkpointer_put_writes is not None:
             config = patch_configurable(
                 self.checkpoint_config,
@@ -406,7 +471,7 @@ class PregelLoop:
                     task = self.tasks.get(task_id)
                 else:
                     task = None
-                self.submit(
+                fut = self.submit(
                     self.checkpointer_put_writes,
                     config,
                     writes_to_save,
@@ -414,12 +479,23 @@ class PregelLoop:
                     task_path_str(task.path) if task else "",
                 )
             else:
-                self.submit(
+                fut = self.submit(
                     self.checkpointer_put_writes,
                     config,
                     writes_to_save,
                     task_id,
                 )
+            if self._delta_write_futs is not None and any(
+                isinstance(self.specs.get(c), DeltaChannel) for c, _ in writes_to_save
+            ):
+                self._delta_write_futs.append(fut)
+            # ERROR_SOURCE_NODE is only appended by commit() when the task
+            # has an error handler (_should_route_to_error_handler), so this
+            # check naturally limits future collection to those tasks.
+            if self._error_handler_write_futs is not None and any(
+                c == ERROR_SOURCE_NODE for c, _ in writes
+            ):
+                self._error_handler_write_futs.append(fut)
         # output writes
         if hasattr(self, "tasks"):
             self.output_writes(task_id, writes)
@@ -499,10 +575,20 @@ class PregelLoop:
             self.tasks[pushed.id] = pushed
             # match any pending writes to the new task
             if not self.is_replaying:
-                self._match_writes({pushed.id: pushed})
+                self._reapply_writes_to_succeeded_nodes({pushed.id: pushed})
             # return the new task, to be started if not run before
             return pushed
 
+    def schedule_error_handler(
+        self, failed_task: PregelExecutableTask, error: BaseException
+    ) -> PregelExecutableTask | None:
+        raise NotImplementedError
+
+    async def aschedule_error_handler(
+        self, failed_task: PregelExecutableTask, error: BaseException
+    ) -> PregelExecutableTask | None:
+        raise NotImplementedError
+
     def tick(self) -> bool:
         """Execute a single iteration of the Pregel loop.
 
@@ -561,9 +647,14 @@ class PregelLoop:
             self.status = "done"
             return False
 
+        if self.control is not None and self.control.drain_requested:
+            self.status = "draining"
+            return False
+
         # if there are pending writes from a previous loop, apply them
         if not self.is_replaying and self.checkpoint_pending_writes:
-            self._match_writes(self.tasks)
+            self._reapply_writes_to_succeeded_nodes(self.tasks)
+            self._resume_error_handlers_if_applicable()
 
         # before execution, check if we should interrupt
         if self.interrupt_before and should_interrupt(
@@ -602,6 +693,11 @@ class PregelLoop:
             self._emit(
                 "values", map_output_values, self.output_keys, writes, self.channels
             )
+        # capture delta-channel writes for exit-mode accumulator before clearing
+        if self._exit_delta_writes is not None:
+            for tid, ch, v in self.checkpoint_pending_writes:
+                if isinstance(self.specs.get(ch), DeltaChannel):
+                    self._exit_delta_writes.append((self.step, tid, ch, v))
         # clear pending writes
         self.checkpoint_pending_writes.clear()
         # only replay (re-execute) done tasks on the first tick
@@ -625,13 +721,88 @@ class PregelLoop:
 
     # private
 
-    def _match_writes(self, tasks: Mapping[str, PregelExecutableTask]) -> None:
+    def _reapply_writes_to_succeeded_nodes(
+        self, tasks: Mapping[str, PregelExecutableTask]
+    ) -> None:
+        """Restore successful channel writes from checkpoint to in-memory tasks.
+
+        Skips control signals (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME)
+        so that failed/interrupted tasks remain with empty writes and will be
+        re-executed (or routed to error handlers) by the runner.
+        """
         for tid, k, v in self.checkpoint_pending_writes:
-            if k in (ERROR, INTERRUPT, RESUME):
+            if k in (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME):
                 continue
             if task := tasks.get(tid):
                 task.writes.append((k, v))
 
+    def _resume_error_handlers_if_applicable(self) -> None:
+        """On resume, schedule error handlers for tasks that failed in a prior run.
+
+        Called right after ``_reapply_writes_to_succeeded_nodes`` during ``tick()``.
+        At that point, ``_reapply_writes_to_succeeded_nodes`` has already skipped
+        ERROR / ERROR_SOURCE_NODE writes, so a previously-failed task still has
+        empty ``writes``.  Without intervention the runner (which executes only
+        tasks where ``not t.writes``) would re-run the original node.
+
+        This method prevents that re-execution for nodes that have an error
+        handler:
+
+        1. Scan ``checkpoint_pending_writes`` for ERROR_SOURCE_NODE markers
+           persisted by a prior ``commit()``.  Each marker means "this task
+           already failed and was routed to an error handler".
+        2. For each such task, write ``(ERROR, error)`` into ``task.writes``
+           so the task is no longer empty — the runner will skip it.
+        3. Prepare a fresh error-handler task and add it to ``self.tasks``.
+           Because the handler task starts with empty ``writes``, the runner
+           will pick it up and execute it.
+        """
+        # Phase 1: collect task-ids that have ERROR_SOURCE_NODE + ERROR pairs.
+        failed: dict[str, BaseException] = {}
+        for tid, chan, val in self.checkpoint_pending_writes:
+            if chan == ERROR_SOURCE_NODE:
+                error = next(
+                    (
+                        v
+                        for t, c, v in self.checkpoint_pending_writes
+                        if t == tid and c == ERROR
+                    ),
+                    None,
+                )
+                if error is not None:
+                    failed[tid] = error
+        # Phase 2: mark originals as done, schedule handler tasks.
+        for task_id, error in failed.items():
+            task = self.tasks.get(task_id)
+            if task is None:
+                continue
+            handler_node = self.nodes[task.name].error_handler_node
+            if not handler_node:
+                continue
+            # Non-empty writes → runner's `not t.writes` filter skips this task.
+            task.writes.append((ERROR, error))
+            # The handler task starts with empty writes → runner will execute it.
+            handler_task = prepare_node_error_handler_task(
+                task,
+                handler_node_name=handler_node,
+                failed_error=error,
+                checkpoint=self.checkpoint,
+                pending_writes=self.checkpoint_pending_writes,
+                processes=self.nodes,
+                channels=self.channels,
+                managed=self.managed,
+                config=task.config,
+                step=self.step,
+                stop=self.stop,
+                store=self.store,
+                checkpointer=self.checkpointer,
+                manager=self.manager,
+                retry_policy=self.retry_policy,
+                cache_policy=self.cache_policy,
+            )
+            if handler_task is not None:
+                self.tasks[handler_task.id] = handler_task
+
     def _pending_interrupts(self) -> set[str]:
         """Return the set of interrupt ids that are pending without corresponding resume values."""
         # mapping of task ids to interrupt ids
@@ -692,7 +863,7 @@ class PregelLoop:
         # writes so that interrupt() calls re-fire instead of returning
         # stale values. But if we're actively resuming, keep them —
         # multi-interrupt scenarios need previously resolved values preserved.
-        if self.is_replaying and (
+        is_time_traveling = self.is_replaying and (
             # Time-travel to a subgraph checkpoint: the parent sets
             # RESUMING=True (it can't distinguish time-travel from resume),
             # so we check if this subgraph's own ns is in checkpoint_map.
@@ -710,7 +881,8 @@ class PregelLoop:
                 # (subgraph input is a Send arg, not a Command)
                 or configurable.get(CONFIG_KEY_RESUMING, False)
             )
-        ):
+        )
+        if is_time_traveling:
             self.checkpoint_pending_writes = [
                 w for w in self.checkpoint_pending_writes if w[1] != RESUME
             ]
@@ -765,6 +937,26 @@ class PregelLoop:
                 if k in self.checkpoint["channel_versions"]:
                     version = self.checkpoint["channel_versions"][k]
                     self.checkpoint["versions_seen"][INTERRUPT][k] = version
+            # When time-traveling (replaying from a specific checkpoint),
+            # save a fork checkpoint so the replayed execution creates a
+            # new branch. Without this, if the execution hits an interrupt
+            # before after_tick() runs, no new checkpoint is created —
+            # the parent's latest checkpoint remains the old one and
+            # subsequent resumes load the wrong state.
+            # Skip for update_state forks (source=update/fork) since they
+            # already have their own fork checkpoint.
+            if is_time_traveling and self.checkpoint_metadata.get("source") not in (
+                "update",
+                "fork",
+            ):
+                # Clear old INTERRUPT writes from the loaded checkpoint.
+                # The fork will have a new checkpoint_id which changes
+                # task IDs — stale interrupt writes would accumulate and
+                # confuse the multiple-interrupt check in future resumes.
+                self.checkpoint_pending_writes = [
+                    w for w in self.checkpoint_pending_writes if w[1] != INTERRUPT
+                ]
+                self._put_checkpoint({"source": "fork"})
             # produce values output
             self._emit(
                 "values", map_output_values, self.output_keys, True, self.channels
@@ -798,6 +990,27 @@ class PregelLoop:
                 self.checkpointer_get_next_version,
                 self.trigger_to_nodes,
             )
+            # Input writes go through `apply_writes` directly (above) — they
+            # never enter `checkpoint_pending_writes`, so the after_tick
+            # capture site does not see them. In exit mode, capture them
+            # here so `_exit_delta_writes` includes the input's delta writes
+            # alongside per-superstep writes; otherwise the input would be
+            # lost on read (it's not in final_checkpoint.channel_values for
+            # sub-freq channels, and walks ignore target.pending_writes).
+            if self._exit_delta_writes is not None:
+                for c, v in input_writes:
+                    if isinstance(self.specs.get(c), DeltaChannel):
+                        self._exit_delta_writes.append((self.step, NULL_TASK_ID, c, v))
+            # Persist delta-channel input writes so sub-freq inputs are
+            # recoverable via ancestor walk (mirrors the Command input path).
+            if self.durability != "exit":
+                delta_input = [
+                    (c, v)
+                    for c, v in input_writes
+                    if isinstance(self.specs.get(c), DeltaChannel)
+                ]
+                if delta_input:
+                    self.put_writes(NULL_TASK_ID, delta_input)
             # save input checkpoint
             self.updated_channels = updated_channels
             self._put_checkpoint({"source": "input"})
@@ -807,14 +1020,28 @@ class PregelLoop:
         if not self.is_nested:
             # Pass the resolved before-bound checkpoint ID so subgraphs can
             # find their corresponding checkpoint without re-fetching the
-            # parent. For forks (source=update), use the fork's parent
+            # parent. For forks (source=update/fork), use the fork's parent
             # checkpoint ID since the fork was created after the subgraph's
             # checkpoints from the original execution.
+            #
+            # Only gate on is_time_traveling (not is_replaying). When the
+            # client resumes with an explicit checkpoint_id that happens to
+            # point at the current head (e.g. LangGraph Studio sending
+            # `checkpoint: {checkpoint_id}` alongside Command(resume=...)),
+            # is_replaying is True but is_time_traveling is False. In that
+            # case subgraphs should load their latest checkpoint normally,
+            # not go through ReplayState's before-bound lookup which would
+            # miss subgraph checkpoints created during processing of the
+            # current parent step.
             replay_state: ReplayState | None = None
-            if self.is_replaying:
+            if is_time_traveling:
                 replay_checkpoint_id = self.checkpoint["id"]
                 if (
-                    self.checkpoint_metadata.get("source") == "update"
+                    self.checkpoint_metadata.get("source")
+                    in (
+                        "update",
+                        "fork",
+                    )
                     and self.prev_checkpoint_config
                 ):
                     replay_checkpoint_id = self.prev_checkpoint_config[CONF].get(
@@ -835,27 +1062,84 @@ class PregelLoop:
         return updated_channels
 
     def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
-        # assign step and parents
+        # `is` (object identity) — not `==`. Three of four call sites pass a
+        # fresh dict ({"source":"input"|"loop"|"fork"}); only
+        # `_suppress_interrupt`(will rename to _on_loop_exit soon)
+        # at exit reuses the existing `self.checkpoint_metadata` instance. So
+        # `metadata is self.checkpoint_metadata` is True only on the exit call,
+        # which is what we use to gate exit-only behaviour (skip count-bump,
+        # don't replace metadata). Could be replaced by an explicit
+        # `exiting: bool = False` parameter; left as-is to match the existing
+        # idiom in this file.
+        # TODO: replace with an explicit `exiting: bool = False` parameter.
         exiting = metadata is self.checkpoint_metadata
         if exiting and self.checkpoint["id"] == self.checkpoint_id_saved:
             # checkpoint already saved
             return
+        # Per-delta-channel counter bookkeeping.
+        #
+        # Each delta channel tracks a (updates, supersteps) tuple:
+        # - `updates` increments only when the channel is written this step.
+        # - `supersteps` increments every superstep regardless.
+        #
+        # `_put_checkpoint` is called once per superstep with a fresh
+        # metadata dict (source="input"|"loop"|"fork") — those are the
+        # intermediate calls that bump counters. In exit mode,
+        # `_suppress_interrupt`(will rename to _on_loop_exit soon)
+        # additionally calls `_put_checkpoint(self.checkpoint_metadata)` AT
+        # EXIT to commit the final checkpoint — this runs *after* the last
+        # intermediate call already counted the last superstep. So the
+        # exit call must NOT bump again or it would double-count the last
+        # superstep.
         if not exiting:
+            prev_counters = dict(
+                self.checkpoint_metadata.get("counters_since_delta_snapshot") or {}
+            )
+            new_counters: dict[str, tuple[int, int]] = {}
+            updated = self.updated_channels or set()
+            for ch_name, ch in self.channels.items():
+                if not isinstance(ch, DeltaChannel):
+                    continue
+                u, s = prev_counters.get(ch_name, (0, 0))
+                s += 1
+                if ch_name in updated:
+                    u += 1
+                new_counters[ch_name] = (u, s)
             metadata["step"] = self.step
             metadata["parents"] = self.config[CONF].get(CONFIG_KEY_CHECKPOINT_MAP, {})
             self.checkpoint_metadata = metadata
+        else:
+            new_counters = dict(
+                self.checkpoint_metadata.get("counters_since_delta_snapshot") or {}
+            )
         # do checkpoint?
         do_checkpoint = self._checkpointer_put_after_previous is not None and (
             exiting or self.durability != "exit"
         )
         # create new checkpoint
+        channels_to_snapshot = (
+            delta_channels_to_snapshot(self.channels, new_counters)
+            if do_checkpoint
+            else set()
+        )
         self.checkpoint = create_checkpoint(
             self.checkpoint,
             self.channels if do_checkpoint else None,
             self.step,
             id=self.checkpoint["id"] if exiting else None,
             updated_channels=self.updated_channels,
+            get_next_version=self.checkpointer_get_next_version
+            if do_checkpoint
+            else None,
+            channels_to_snapshot=channels_to_snapshot,
         )
+        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:
+            self.checkpoint_metadata["counters_since_delta_snapshot"] = non_zero
+        elif "counters_since_delta_snapshot" in self.checkpoint_metadata:
+            del self.checkpoint_metadata["counters_since_delta_snapshot"]
         # sanitize TASK channel in the checkpoint before saving (durability=="exit")
         if TASKS in self.checkpoint["channel_values"] and any(
             isinstance(channel, UntrackedValue) for channel in self.channels.values()
@@ -914,6 +1198,99 @@ class PregelLoop:
             # increment step
             self.step += 1
 
+    def _put_exit_delta_writes(self) -> None:
+        """Stage stub + accumulated delta writes so final_checkpoint's put
+        waits on them (visibility invariant: both must be durable before
+        final_checkpoint becomes visible to readers).
+
+        Stub is created lazily — only when no persisted parent exists AND at
+        least one delta channel has writes that won't be snapshotted.
+        """
+        if (
+            not self._exit_delta_writes
+            or self.checkpointer is None
+            or self._checkpointer_put_after_previous is None
+            or self.checkpointer_put_writes is None
+        ):
+            return
+
+        counters = dict(
+            self.checkpoint_metadata.get("counters_since_delta_snapshot") or {}
+        )
+        channels_to_snapshot = delta_channels_to_snapshot(self.channels, counters)
+
+        pending = [
+            (step, tid, ch, v)
+            for (step, tid, ch, v) in self._exit_delta_writes
+            if ch not in channels_to_snapshot
+        ]
+        if not pending:
+            return
+
+        if self._has_persisted_parent:
+            # _initial_checkpoint_config's checkpoint_id is the saved parent's
+            # id (saver returned a real tuple at __enter__).
+            anchor_config = self._initial_checkpoint_config
+        else:
+            stub_cp = empty_checkpoint()
+            stub_cp["id"] = self.checkpoint_id_saved
+            stub_cp["ts"] = datetime.now(timezone.utc).isoformat()
+            # Stub has no parent (checkpoint_id=None in config).
+            stub_put_config = patch_configurable(
+                self._initial_checkpoint_config,
+                {CONFIG_KEY_CHECKPOINT_ID: None},
+            )
+            # Anchor config for put_writes: checkpoint_id = stub's id.
+            anchor_config = patch_configurable(
+                self._initial_checkpoint_config,
+                {CONFIG_KEY_CHECKPOINT_ID: stub_cp["id"]},
+            )
+            self._put_checkpoint_fut = self.submit(
+                self._checkpointer_put_after_previous,
+                getattr(self, "_put_checkpoint_fut", None),
+                stub_put_config,
+                stub_cp,
+                {"step": -2},
+                {},
+            )
+            # Set checkpoint_config so final_checkpoint's _put_checkpoint
+            # sees the stub as its parent.
+            self.checkpoint_config = anchor_config
+
+        # Step-prefixed synthetic task_id preserves chronological superstep
+        # order under the saver's ORDER BY task_id, idx sorting.
+        grouped: dict[tuple[int, str], list[tuple[str, Any]]] = {}
+        for step, tid, ch, v in pending:
+            grouped.setdefault((step, tid), []).append((ch, v))
+        anchor_write_config = patch_configurable(
+            anchor_config,
+            {
+                CONFIG_KEY_CHECKPOINT_NS: self.config[CONF].get(
+                    CONFIG_KEY_CHECKPOINT_NS, ""
+                ),
+                CONFIG_KEY_CHECKPOINT_ID: anchor_config[CONF][CONFIG_KEY_CHECKPOINT_ID],
+            },
+        )
+        for (step, tid), entries in grouped.items():
+            synth_tid = f"{step:08d}-{tid}"
+            if self.checkpointer_put_writes_accepts_task_path:
+                fut = self.submit(
+                    self.checkpointer_put_writes,
+                    anchor_write_config,
+                    entries,
+                    synth_tid,
+                    "",
+                )
+            else:
+                fut = self.submit(
+                    self.checkpointer_put_writes,
+                    anchor_write_config,
+                    entries,
+                    synth_tid,
+                )
+            if self._delta_write_futs is not None:
+                self._delta_write_futs.append(fut)
+
     def _suppress_interrupt(
         self,
         exc_type: type[BaseException] | None,
@@ -929,6 +1306,7 @@ class PregelLoop:
             # or a nested graph with checkpointer=True
             or all(NS_END not in part for part in self.checkpoint_ns)
         ):
+            self._put_exit_delta_writes()
             self._put_checkpoint(self.checkpoint_metadata)
             self._put_pending_writes()
         # suppress interrupt
@@ -1134,6 +1512,9 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
         metadata: CheckpointMetadata,
         new_versions: ChannelVersions,
     ) -> RunnableConfig:
+        if self._delta_write_futs:
+            futs, self._delta_write_futs = self._delta_write_futs, []
+            concurrent.futures.wait(futs)
         try:
             if prev is not None:
                 prev.result()
@@ -1165,6 +1546,43 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
                 self.output_writes(task.id, task.writes, cached=True)
         return pushed
 
+    def schedule_error_handler(
+        self, failed_task: PregelExecutableTask, error: BaseException
+    ) -> PregelExecutableTask | None:
+        handler_node = self.nodes[failed_task.name].error_handler_node
+        if not handler_node:
+            return None
+        # ensure error + ERROR_SOURCE_NODE writes are durable before handler runs
+        if self._error_handler_write_futs:
+            futs, self._error_handler_write_futs = self._error_handler_write_futs, []
+            concurrent.futures.wait(futs)
+        handler_task = prepare_node_error_handler_task(
+            failed_task,
+            handler_node_name=handler_node,
+            failed_error=error,
+            checkpoint=self.checkpoint,
+            pending_writes=self.checkpoint_pending_writes,
+            processes=self.nodes,
+            channels=self.channels,
+            managed=self.managed,
+            config=failed_task.config,
+            step=self.step,
+            stop=self.stop,
+            store=self.store,
+            checkpointer=self.checkpointer,
+            manager=self.manager,
+            retry_policy=self.retry_policy,
+            cache_policy=self.cache_policy,
+        )
+        if handler_task is None:
+            return None
+        self.tasks[handler_task.id] = handler_task
+        if not self.is_replaying:
+            self._reapply_writes_to_succeeded_nodes({handler_task.id: handler_task})
+        for task in self.match_cached_writes():
+            self.output_writes(task.id, task.writes, cached=True)
+        return handler_task
+
     def put_writes(self, task_id: str, writes: WritesT) -> None:
         """Put writes for a task, to be read by the next tick."""
         super().put_writes(task_id, writes)
@@ -1212,6 +1630,10 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
             # graph/thread. Returns None on first invocation.
             saved = self.checkpointer.get_tuple(self.checkpoint_config)
 
+        # Capture before the synthetic-empty fallback below overwrites `saved`.
+        # `_put_exit_delta_writes` uses this on first run (no persisted parent)
+        # to lazy-create a stub instead of anchoring delta writes on a parent.
+        self._has_persisted_parent = saved is not None
         if saved is None:
             saved = CheckpointTuple(
                 self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
@@ -1227,6 +1649,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
                 **saved.config.get(CONF, {}),
             },
         }
+        self._initial_checkpoint_config = self.checkpoint_config
         self.prev_checkpoint_config = saved.parent_config
         self.checkpoint_id_saved = saved.checkpoint["id"]
         self.checkpoint = saved.checkpoint
@@ -1236,9 +1659,17 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
             if saved.pending_writes is not None
             else []
         )
+        self._delta_write_futs = []
+        self._error_handler_write_futs = []
+        self._exit_delta_writes = (
+            [] if self.durability == "exit" and self.checkpointer is not None else None
+        )
         self.submit = self.stack.enter_context(BackgroundExecutor(self.config))
         self.channels, self.managed = channels_from_checkpoint(
-            self.specs, self.checkpoint
+            self.specs,
+            self.checkpoint,
+            saver=self.checkpointer,
+            config=self.checkpoint_config,
         )
         self.stack.push(self._suppress_interrupt)
         self.status = "input"
@@ -1333,6 +1764,11 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
         metadata: CheckpointMetadata,
         new_versions: ChannelVersions,
     ) -> RunnableConfig:
+        # Drain DeltaChannel write futures before committing the checkpoint so
+        # ancestor walks never see a checkpoint without its backing writes.
+        if self._delta_write_futs:
+            futs, self._delta_write_futs = self._delta_write_futs, []
+            await asyncio.gather(*futs)
         try:
             if prev is not None:
                 await prev
@@ -1364,6 +1800,43 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
                 self.output_writes(task.id, task.writes, cached=True)
         return pushed
 
+    async def aschedule_error_handler(
+        self, failed_task: PregelExecutableTask, error: BaseException
+    ) -> PregelExecutableTask | None:
+        handler_node = self.nodes[failed_task.name].error_handler_node
+        if not handler_node:
+            return None
+        # ensure error + ERROR_SOURCE_NODE writes are durable before handler runs
+        if self._error_handler_write_futs:
+            futs, self._error_handler_write_futs = self._error_handler_write_futs, []
+            await asyncio.gather(*futs)
+        handler_task = prepare_node_error_handler_task(
+            failed_task,
+            handler_node_name=handler_node,
+            failed_error=error,
+            checkpoint=self.checkpoint,
+            pending_writes=self.checkpoint_pending_writes,
+            processes=self.nodes,
+            channels=self.channels,
+            managed=self.managed,
+            config=failed_task.config,
+            step=self.step,
+            stop=self.stop,
+            store=self.store,
+            checkpointer=self.checkpointer,
+            manager=self.manager,
+            retry_policy=self.retry_policy,
+            cache_policy=self.cache_policy,
+        )
+        if handler_task is None:
+            return None
+        self.tasks[handler_task.id] = handler_task
+        if not self.is_replaying:
+            self._reapply_writes_to_succeeded_nodes({handler_task.id: handler_task})
+        for task in await self.amatch_cached_writes():
+            self.output_writes(task.id, task.writes, cached=True)
+        return handler_task
+
     def put_writes(self, task_id: str, writes: WritesT) -> None:
         """Put writes for a task, to be read by the next tick."""
         super().put_writes(task_id, writes)
@@ -1414,6 +1887,10 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             # graph/thread. Returns None on first invocation.
             saved = await self.checkpointer.aget_tuple(self.checkpoint_config)
 
+        # Capture before the synthetic-empty fallback below overwrites `saved`.
+        # `_put_exit_delta_writes` uses this on first run (no persisted parent)
+        # to lazy-create a stub instead of anchoring delta writes on a parent.
+        self._has_persisted_parent = saved is not None
         if saved is None:
             saved = CheckpointTuple(
                 self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
@@ -1429,6 +1906,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
                 **saved.config.get(CONF, {}),
             },
         }
+        self._initial_checkpoint_config = self.checkpoint_config
         self.prev_checkpoint_config = saved.parent_config
         self.checkpoint_id_saved = saved.checkpoint["id"]
         self.checkpoint = saved.checkpoint
@@ -1438,11 +1916,19 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             if saved.pending_writes is not None
             else []
         )
+        self._delta_write_futs = []
+        self._error_handler_write_futs = []
+        self._exit_delta_writes = (
+            [] if self.durability == "exit" and self.checkpointer is not None else None
+        )
         self.submit = await self.stack.enter_async_context(
             AsyncBackgroundExecutor(self.config)
         )
-        self.channels, self.managed = channels_from_checkpoint(
-            self.specs, self.checkpoint
+        self.channels, self.managed = await achannels_from_checkpoint(
+            self.specs,
+            self.checkpoint,
+            saver=self.checkpointer,
+            config=self.checkpoint_config,
         )
         self.stack.push(self._suppress_interrupt)
         self.status = "input"

libs/langgraph/langgraph/pregel/_messages.py

@@ -10,11 +10,13 @@ from typing import (
 from uuid import UUID, uuid4
 
 from langchain_core.callbacks import BaseCallbackHandler
-from langchain_core.messages import BaseMessage
+from langchain_core.messages import BaseMessage, ToolMessage
+from langchain_core.messages.utils import convert_to_messages
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, LLMResult
 from pydantic import BaseModel
 
-from langgraph._internal._constants import NS_END, NS_SEP
+from langgraph._internal._config import filter_to_user_tags
+from langgraph._internal._constants import NS_SEP
 from langgraph.constants import TAG_HIDDEN, TAG_NOSTREAM
 from langgraph.pregel.protocol import StreamChunk
 from langgraph.types import Command
@@ -24,6 +26,11 @@ try:
 except ImportError:
     _StreamingCallbackHandler = object  # type: ignore
 
+try:
+    from langchain_core.tracers._streaming import _V2StreamingCallbackHandler
+except ImportError:
+    _V2StreamingCallbackHandler = object  # type: ignore
+
 T = TypeVar("T")
 Meta = tuple[tuple[str, ...], dict[str, Any]]
 
@@ -132,23 +139,14 @@ class StreamMessagesHandler(BaseCallbackHandler, _StreamingCallbackHandler):
         **kwargs: Any,
     ) -> Any:
         if metadata and (not tags or (TAG_NOSTREAM not in tags)):
-            task_checkpoint_ns = cast(str, metadata["langgraph_checkpoint_ns"])
-            checkpoint_ns = (
-                f"{task_checkpoint_ns.rsplit(NS_END, 1)[0]}{NS_END}"
-                if NS_END in task_checkpoint_ns
-                else task_checkpoint_ns
-            )
-            ns = tuple(task_checkpoint_ns.split(NS_SEP))[:-1]
+            ns = tuple(cast(str, metadata["langgraph_checkpoint_ns"]).split(NS_SEP))[
+                :-1
+            ]
             if not self.subgraphs and len(ns) > 0 and ns != self.parent_ns:
                 return
-            stream_metadata = dict(metadata)
-            stream_metadata["langgraph_checkpoint_ns"] = checkpoint_ns
-            # Preserve backwards-compatible streamed checkpoint metadata shape.
-            stream_metadata["checkpoint_ns"] = checkpoint_ns
-            if tags:
-                if filtered_tags := [t for t in tags if not t.startswith("seq:step")]:
-                    stream_metadata["tags"] = filtered_tags
-            self.metadata[run_id] = (ns, stream_metadata)
+            if (filtered_tags := filter_to_user_tags(tags)) is not None:
+                metadata["tags"] = filtered_tags
+            self.metadata[run_id] = (ns, metadata)
 
     def on_llm_new_token(
         self,
@@ -256,3 +254,208 @@ class StreamMessagesHandler(BaseCallbackHandler, _StreamingCallbackHandler):
         **kwargs: Any,
     ) -> Any:
         self.metadata.pop(run_id, None)
+
+
+class StreamMessagesHandlerV2(StreamMessagesHandler, _V2StreamingCallbackHandler):
+    """v2 variant of `StreamMessagesHandler`.
+
+    Declaring `_V2StreamingCallbackHandler` as a base flips
+    `BaseChatModel.invoke` to route through `_stream_chat_model_events`
+    (firing `on_stream_event`) instead of `_stream` (firing
+    `on_llm_new_token`). Inherits `on_stream_event` from the parent,
+    which forwards protocol events onto the messages stream channel.
+
+    Pregel attaches this class instead of the v1 handler only when
+    `StreamingHandler` opts in via the internal
+    `CONFIG_KEY_STREAM_MESSAGES_V2` config key; direct
+    `graph.stream(stream_mode="messages")` callers keep the v1
+    AIMessageChunk shape.
+    """
+
+    def on_llm_new_token(
+        self,
+        token: str,
+        *,
+        chunk: ChatGenerationChunk | None = None,
+        run_id: UUID,
+        parent_run_id: UUID | None = None,
+        tags: list[str] | None = None,
+        **kwargs: Any,
+    ) -> Any:
+        """Intentional no-op — v1 chunks are not used on v2-flagged runs.
+
+        The v2 marker already steers `invoke` to the event generator, so
+        `on_llm_new_token` should not fire under normal routing. This
+        override stays a pass-through (no call to `super()`) to make
+        the intent explicit and to guard against any caller (e.g. a
+        node that calls `model.stream()` directly, which still fires
+        the v1 callback) leaking AIMessageChunks onto a v2-flagged
+        messages stream.
+        """
+        # Intentionally empty: v2 handler does not forward v1 chunks.
+
+    def __init__(
+        self,
+        stream: Callable[[StreamChunk], None],
+        subgraphs: bool,
+        *,
+        parent_ns: tuple[str, ...] | None = None,
+    ) -> None:
+        super().__init__(stream, subgraphs, parent_ns=parent_ns)
+        self._streamed_run_ids: set[UUID] = set()
+
+    def _find_and_emit_messages(self, meta: Meta, response: Any) -> None:
+        """Like the v1 handler, but skip ToolMessage from node outputs.
+
+        Tool results belong on the tools channel / state in v3; v2-flagged streams
+        must not replay finalized ToolMessages as chat tokens (see MessagesTransformer).
+        Legacy v1-only `stream_mode="messages"` still emits ToolMessages (see subgraph
+        streaming tests).
+        """
+        if isinstance(response, BaseMessage) and not isinstance(response, ToolMessage):
+            self._emit(meta, response, dedupe=True)
+        elif isinstance(response, Sequence):
+            for value in response:
+                if isinstance(value, BaseMessage) and not isinstance(
+                    value, ToolMessage
+                ):
+                    self._emit(meta, value, dedupe=True)
+        else:
+            for value in _state_values(response):
+                if isinstance(value, BaseMessage) and not isinstance(
+                    value, ToolMessage
+                ):
+                    self._emit(meta, value, dedupe=True)
+                elif isinstance(value, Sequence):
+                    for item in value:
+                        if isinstance(item, BaseMessage) and not isinstance(
+                            item, ToolMessage
+                        ):
+                            self._emit(meta, item, dedupe=True)
+
+    def on_llm_end(
+        self,
+        response: LLMResult,
+        *,
+        run_id: UUID,
+        parent_run_id: UUID | None = None,
+        **kwargs: Any,
+    ) -> Any:
+        if meta := self.metadata.get(run_id):
+            if response.generations and response.generations[0]:
+                gen = response.generations[0][0]
+                if isinstance(gen, ChatGeneration):
+                    if run_id in self._streamed_run_ids:
+                        if gen.message.id is None:
+                            gen.message.id = str(uuid4())
+                        self.seen.add(gen.message.id)
+                    else:
+                        self._emit(meta, gen.message, dedupe=True)
+        self._streamed_run_ids.discard(run_id)
+        self.metadata.pop(run_id, None)
+
+    def on_llm_error(
+        self,
+        error: BaseException,
+        *,
+        run_id: UUID,
+        parent_run_id: UUID | None = None,
+        **kwargs: Any,
+    ) -> Any:
+        self._streamed_run_ids.discard(run_id)
+        super().on_llm_error(
+            error,
+            run_id=run_id,
+            parent_run_id=parent_run_id,
+            **kwargs,
+        )
+
+    def on_stream_event(
+        self,
+        event: dict[str, Any],
+        *,
+        run_id: UUID,
+        parent_run_id: UUID | None = None,
+        tags: list[str] | None = None,
+        **kwargs: Any,
+    ) -> Any:
+        """Forward a protocol event from `stream_events(version="v3")` as a messages stream part.
+
+        Fires once per `MessagesData` event (`message-start`, per-block
+        `content-block-*`, `message-finish`). The transformer layer
+        correlates events back to a single `ChatModelStream` via
+        `metadata["run_id"]` — attached here so the v1
+        `stream_mode="messages"` output (which emits
+        `(AIMessageChunk, metadata)` via `on_llm_new_token`) keeps its
+        original metadata shape.
+
+        Lives on the v2 handler rather than the v1 base: content-block
+        events are a v2-only concept, and forwarding them only when the
+        v2 handler is attached keeps the message channel's shape
+        predictable for v1 callers.
+        """
+        if meta := self.metadata.get(run_id):
+            # Record message_id on message-start so on_chain_end's
+            # dedupe skips the finalized AIMessage the node returns
+            # (otherwise the messages projection double-counts: once
+            # from streaming, once from the chain output).
+            if event.get("event") == "message-start":
+                self._streamed_run_ids.add(run_id)
+                msg_id = event.get("message_id")
+                if msg_id:
+                    self.seen.add(msg_id)
+            v2_meta = {**meta[1], "run_id": str(run_id)}
+            self.stream((meta[0], "messages", (event, v2_meta)))
+
+
+# Known role values (OpenAI-style) and type values (LangChain serialisation)
+# that identify a dict as a message. Checked before coercing to BaseMessage so
+# we don't accidentally touch unrelated dicts that happen to have a "role" key.
+_MESSAGE_ROLES: frozenset[str] = frozenset(
+    {"user", "human", "assistant", "ai", "tool", "system", "function"}
+)
+_MESSAGE_TYPES: frozenset[str] = frozenset(
+    {"human", "ai", "tool", "system", "function", "remove"}
+)
+
+
+def _is_message_dict(item: dict) -> bool:
+    return item.get("role") in _MESSAGE_ROLES or item.get("type") in _MESSAGE_TYPES
+
+
+def ensure_message_ids(value: Any) -> None:
+    """Coerce message-like write values to typed BaseMessages with stable IDs.
+
+    Called in put_writes() before DeltaChannel writes are submitted to the
+    checkpointer. Without this the checkpoint may store raw dicts or id=None
+    BaseMessages; every get_state() replay then produces a different UUID and
+    the same message appears with a different ID in each LangSmith trace.
+
+    Handles three input shapes:
+    - BaseMessage objects: assign a UUID if id is None.
+    - Dicts with a known "role" (OpenAI-style) or "type" (LangChain format) at
+      the root level: stamp "id" into the dict in-place. The reducer's
+      convert_to_messages call will forward the id to the resulting BaseMessage.
+    - Lists of the above: apply the same logic to each element, replacing dict
+      items with coerced BaseMessages so the shared list reference seen by
+      checkpoint_pending_writes and the background thread both get typed messages.
+
+    Mutating synchronously here (before the background thread is submitted) is
+    safe: the serialised bytes always reflect the post-coercion state.
+    """
+    if isinstance(value, BaseMessage):
+        if value.id is None:
+            value.id = str(uuid4())
+    elif isinstance(value, dict) and _is_message_dict(value):
+        if not value.get("id"):
+            value["id"] = str(uuid4())
+    elif isinstance(value, list):
+        for i, item in enumerate(value):
+            if isinstance(item, BaseMessage):
+                if item.id is None:
+                    item.id = str(uuid4())
+            elif isinstance(item, dict) and _is_message_dict(item):
+                msg = convert_to_messages([item])[0]
+                if msg.id is None:
+                    msg.id = str(uuid4())
+                value[i] = msg

libs/langgraph/langgraph/pregel/_read.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 from collections.abc import AsyncIterator, Callable, Iterator, Mapping, Sequence
+from datetime import timedelta
 from functools import cached_property
 from typing import (
     Any,
@@ -11,10 +12,11 @@ from langchain_core.runnables import Runnable, RunnableConfig
 from langgraph._internal._config import merge_configs
 from langgraph._internal._constants import CONF, CONFIG_KEY_READ
 from langgraph._internal._runnable import RunnableCallable, RunnableSeq
+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
+from langgraph.types import CachePolicy, RetryPolicy, TimeoutPolicy
 
 READ_TYPE = Callable[[str | Sequence[str], bool], Any | dict[str, Any]]
 INPUT_CACHE_KEY_TYPE = tuple[Callable[..., Any], tuple[str, ...]]
@@ -123,12 +125,25 @@ class PregelNode:
     cache_policy: CachePolicy | None
     """The cache policy to use when invoking the node."""
 
+    timeout: TimeoutPolicy | None
+    """Timeout policy for a single invocation.
+
+    If exceeded, `NodeTimeoutError` is raised and the retry policy (if any)
+    decides whether to retry. Supported only for async nodes.
+    """
+
     tags: Sequence[str] | None
     """Tags to attach to the node for tracing."""
 
     metadata: Mapping[str, Any] | None
     """Metadata to attach to the node for tracing."""
 
+    is_error_handler: bool
+    """Whether this node is registered as an error handler node."""
+
+    error_handler_node: str | None
+    """Optional handler node name for failures from this node."""
+
     subgraphs: Sequence[PregelProtocol]
     """Subgraphs used by the node."""
 
@@ -144,7 +159,10 @@ class PregelNode:
         bound: Runnable[Any, Any] | None = None,
         retry_policy: RetryPolicy | Sequence[RetryPolicy] | None = None,
         cache_policy: CachePolicy | None = None,
+        is_error_handler: bool = False,
+        error_handler_node: str | None = None,
         subgraphs: Sequence[PregelProtocol] | None = None,
+        timeout: float | timedelta | TimeoutPolicy | None = None,
     ) -> None:
         self.channels = channels
         self.triggers = list(triggers)
@@ -156,8 +174,11 @@ class PregelNode:
             self.retry_policy = (retry_policy,)
         else:
             self.retry_policy = retry_policy
+        self.timeout = coerce_timeout_policy(timeout)
         self.tags = tags
         self.metadata = metadata
+        self.is_error_handler = is_error_handler
+        self.error_handler_node = error_handler_node
         if subgraphs is not None:
             self.subgraphs = subgraphs
         elif self.bound is not DEFAULT_BOUND: