update

fun
foo
2026-08-26 17:42:24 +02:00 · 2026-04-21 15:43:24 -07:00 · 2026-04-21 14:31:43 -07:00 · 2026-04-21 13:52:00 -07:00 · 2026-04-21 13:04:40 -04:00 · 2026-04-21 11:03:58 -04:00
267 changed files with 6852 additions and 49865 deletions
@@ -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" != "1.1.14" ]; then
-            echo "LANGCHAIN_OPENAI_VERSION != 1.1.14; $LANGCHAIN_OPENAI_VERSION"
+          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.0.1" ]; then
+            echo "LANGCHAIN_OPENAI_VERSION != 1.0.1; $LANGCHAIN_OPENAI_VERSION"
            exit 1
          fi
          LANGCHAIN_ANTHROPIC_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-anthropic'); print(v);")
@@ -1,85 +0,0 @@
-name: sdk-py integration test
-
-on:
-  workflow_call:
-    secrets:
-      LANGSMITH_API_KEY:
-        required: false
-      DOCKERHUB_USERNAME:
-        required: false
-      DOCKERHUB_RO_TOKEN:
-        required: false
-
-permissions:
-  contents: read
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    name: "sdk-py integration"
-    defaults:
-      run:
-        working-directory: libs/sdk-py
-    env:
-      HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
-    steps:
-      - uses: actions/checkout@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 ${i}s"
-              exit 0
-            fi
-            sleep 2
-          done
-          echo "API failed to become healthy within 120s"
-          docker compose -f libs/sdk-py/integration/docker-compose.yml logs api | tail -100
-          exit 1
-
-      - name: Run integration suite
-        if: env.HAS_LANGSMITH_API_KEY == 'true'
-        run: uv run pytest tests/integration/ -m integration
-
-      - name: Dump api logs on failure
-        if: failure() && env.HAS_LANGSMITH_API_KEY == 'true'
-        working-directory: libs/sdk-py/integration
-        run: docker compose logs api | tail -200
-
-      - name: Tear down stack
-        if: always() && env.HAS_LANGSMITH_API_KEY == 'true'
-        working-directory: libs/sdk-py/integration
-        run: docker compose down -v
@@ -33,7 +33,7 @@ jobs:
          cache-suffix: test-${{ inputs.working-directory }}
          working-directory: ${{ inputs.working-directory }}
      - name: Login to Docker Hub
-        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
        if: ${{ !github.event.pull_request.head.repo.fork }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -31,7 +31,7 @@ jobs:
          cache-suffix: "test-langgraph"
          working-directory: libs/langgraph
      - name: Login to Docker Hub
-        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2 # v4
        if: ${{ !github.event.pull_request.head.repo.fork }}
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -82,7 +82,7 @@ jobs:
          path: ${{ inputs.working-directory }}/dist/

      - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
        with:
          packages-dir: ${{ inputs.working-directory }}/dist/
          verbose: true
@@ -57,19 +57,15 @@ jobs:
            echo EOF
          } >> "$GITHUB_OUTPUT"
      - name: Annotation
-        uses: actions/github-script@v9
-        env:
-          CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
-          BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}
-          COMPARE_OUTPUT: ${{ steps.compare.outputs.OUTPUT }}
+        uses: actions/github-script@v8
        with:
          script: |
-            const file = JSON.parse(process.env.CHANGED_FILES || "[]")[0]
-            core.notice(process.env.BENCHMARK_OUTPUT || "", {
+            const file = JSON.parse(`${{ steps.files.outputs.added_modified_renamed }}`)[0]
+            core.notice(`${{ steps.benchmark.outputs.OUTPUT }}`, {
              title: 'Benchmark results',
              file,
            })
-            core.notice(process.env.COMPARE_OUTPUT || "", {
+            core.notice(`${{ steps.compare.outputs.OUTPUT }}`, {
              title: 'Comparison against main',
              file,
            })
@@ -28,7 +28,6 @@ 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
@@ -48,10 +47,6 @@ 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
@@ -161,13 +156,6 @@ jobs:
    uses: ./.github/workflows/_integration_test.yml
    secrets: inherit

-  sdk-py-integration-test:
-    needs: changes
-    if: needs.changes.outputs.sdk_py == 'true'
-    name: "sdk-py integration test"
-    uses: ./.github/workflows/_sdk_integration_test.yml
-    secrets: inherit
-
  ci_success:
    name: "CI Success"
    needs:
@@ -178,7 +166,6 @@ jobs:
        check-sdk-methods,
        check-schema,
        integration-test,
-        sdk-py-integration-test,
      ]
    if: |
      always()
@@ -40,7 +40,7 @@ jobs:
        uses: actions/configure-pages@v6

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

@@ -32,7 +32,6 @@ 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,
@@ -269,7 +268,6 @@ jobs:
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache-suffix: "release"
-          enable-cache: false
          working-directory: ${{ inputs.working-directory }}

      - uses: actions/download-artifact@v8
@@ -278,7 +276,7 @@ jobs:
          path: ${{ inputs.working-directory }}/dist/

      - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # release/v1
        with:
          packages-dir: ${{ inputs.working-directory }}/dist/
          verbose: true
@@ -311,7 +309,6 @@ jobs:
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          cache-suffix: "release"
-          enable-cache: false
          working-directory: ${{ inputs.working-directory }}

      - uses: actions/download-artifact@v8
@@ -26,7 +26,7 @@ jobs:

    steps:
      - name: Find and reopen matching PRs
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -50,7 +50,7 @@ jobs:
    steps:
      - name: Check for issue link and assignee
        id: check-link
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -283,7 +283,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -312,7 +312,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          steps.check-link.outputs.has-link == 'true' && steps.check-link.outputs.is-assigned == 'true'
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -366,7 +366,7 @@ jobs:
        if: >-
          env.ENFORCE_ISSUE_LINK == 'true' &&
          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          script: |
            const { owner, repo } = context.repo;
@@ -63,7 +63,7 @@ jobs:
      - name: Check if contributor is external
        if: steps.app-token.outcome == 'success'
        id: check-membership
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -102,7 +102,7 @@ jobs:

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

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

      - name: Add internal label
        if: steps.check-membership.outputs.is-external == 'false'
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        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@v9
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -48,7 +48,7 @@ jobs:
      - name: Check if contributor is external
        if: steps.app-token.outcome == 'success'
        id: check-membership
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          github-token: ${{ steps.app-token.outputs.token }}
          script: |
@@ -90,7 +90,7 @@ jobs:
      # event fires and triggers require_issue_link.yml.
      - name: Apply contributor tier label
        if: steps.check-membership.outputs.is-external == 'true'
-        uses: actions/github-script@v9
+        uses: actions/github-script@v8
        with:
          # Use App token so the "labeled" event propagates to downstream
          # workflows (e.g. require_issue_link.yml).
@@ -145,7 +145,7 @@ jobs:

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

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

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

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

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

 ## Why use LangGraph?

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

 To improve your LLM application development, pair LangGraph with:

- [Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview) – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
+- [Deep Agents](https://github.com/langchain-ai/deepagents) *(new!)* – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
 - [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
 - [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
 - [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).
@@ -0,0 +1,405 @@
+# DiffChannel: Incremental Checkpoint Storage for Append-Style Reducers
+
+**Date:** 2026-04-17  
+**Status:** Approved for implementation  
+**Scope:** `libs/checkpoint`, `libs/langgraph`, `libs/checkpoint-postgres`
+
+---
+
+## Motivation
+
+LangGraph checkpoints today store the **full accumulated value** of every channel on every step. For a `messages` channel backed by `add_messages`, this means each checkpoint blob contains the entire conversation history. Storage cost grows O(N²) in the number of turns: step 1 stores 1 message, step 100 stores 100 messages, step 1000 stores 1000 messages. For long-running agentic conversations with high-token messages this is untenable.
+
+The fix is to store only the **delta** (new writes) per step, reconstructing the full accumulated value at load time by replaying the chain. This is an opt-in mechanism — existing graphs are unaffected.
+
+---
+
+## Non-Goals
+
+- **Compaction / materialized snapshots**: deferred. Load cost stays O(N) blob fetches but those fetches are batched into a single query — acceptable for now.
+- **SQLite saver support**: SQLite stores all channel values inline in one row (no per-channel blob table). Deferred to a follow-up.
+- **Automatic migration** of existing `BinaryOperatorAggregate` channels: users opt in explicitly. Old checkpoints load correctly via the backwards-compatibility path in `from_checkpoint`.
+
+---
+
+## Architecture Overview
+
+```
+User state definition
+  └── Annotated[list[AnyMessage], DiffChannel(add_messages)]
+
+Write path (per superstep)
+  DiffChannel.update()       — apply operator, accumulate writes in _pending
+  DiffChannel.checkpoint()   — return DiffDelta(delta=_pending, prev_version=_base_version)
+  serde.dumps_typed()        — serialize DiffDelta as ("diff", msgpack_bytes)
+  saver.put()                — store blob at (thread_id, ns, "messages", version_N)
+  DiffChannel.after_checkpoint(version_N) — advance _base_version, clear _pending
+
+Read path (on graph load or time-travel)
+  saver.get_tuple()          — fetch current-version blob per channel
+  saver._load_blobs()        — detect "diff" type → follow chain to reconstruct DiffChainValue
+  DiffChannel.from_checkpoint(DiffChainValue) — replay deltas with operator → full list
+  DiffChannel.after_checkpoint(version_N)     — set _base_version for next write
+```
+
+The pregel layer (`_checkpoint.py`, `_loop.py`) is unchanged except for two small additions to call the new `after_checkpoint` hook. The saver public interface (`BaseCheckpointSaver`) gains no new methods. All chain-following logic lives inside each saver's private `_load_blobs`.
+
+---
+
+## New Protocol Types
+
+**Location:** `libs/checkpoint/langgraph/checkpoint/base/__init__.py`
+
+Two dataclasses form the contract between `DiffChannel` and savers:
+
+```python
+@dataclass
+class DiffDelta:
+    """Returned by DiffChannel.checkpoint(). Written to the blob store."""
+    delta: list[Any]           # raw writes passed to update() this step
+    prev_version: str | None   # version of the previous diff blob; None = chain root
+```
+
+```python
+@dataclass
+class DiffChainValue:
+    """Passed to DiffChannel.from_checkpoint(). Assembled by _load_blobs()."""
+    base: list[Any] | None     # starting accumulated value (None = empty start)
+    deltas: list[list[Any]]    # write-sets ordered oldest → newest
+```
+
+`DiffDelta` lives in the checkpoint base package (not the channel module) so savers can import it without creating a circular dependency. `DiffChainValue` is there for the same reason.
+
+---
+
+## `BaseChannel.after_checkpoint()` Hook
+
+**Location:** `libs/langgraph/langgraph/channels/base.py`
+
+```python
+def after_checkpoint(self, version: Any) -> None:
+    """Called after checkpoint() (with the new version) and after from_checkpoint()
+    (with the current version). No-op by default; DiffChannel overrides."""
+    pass
+```
+
+This is a **non-abstract, no-op default** — fully backwards compatible. All existing channels inherit it silently. It is NOT in the abstract interface.
+
+---
+
+## `DiffChannel[V]`
+
+**Location:** `libs/langgraph/langgraph/channels/diff.py` (new file)
+
+### Internal state
+
+| Attribute | Type | Description |
+|---|---|---|
+| `value` | `list[V]` | Full accumulated value (the reconstructed list) |
+| `operator` | `Callable` | The binary reducer (e.g. `add_messages`) |
+| `_pending` | `list[Any]` | Raw writes accumulated since last `after_checkpoint` call |
+| `_base_version` | `str \| None` | Version this channel was last checkpointed at (= `prev_version` for next delta) |
+| `_overwritten` | `bool` | True if an `Overwrite` was applied since last `after_checkpoint`; makes next blob a chain root |
+
+### `update(values)`
+
+Mirrors `BinaryOperatorAggregate.update()` with two additions:
+
+1. For each non-Overwrite value: apply `self.operator(self.value, value)` as before; **also append the raw incoming value to `self._pending`**.
+2. For an `Overwrite(v)` value: set `self.value = v`; set `self._pending = list(v)` (full value becomes the new delta); set `self._overwritten = True`.
+
+The key: `_pending` stores the **incoming writes** (what was passed to `update()`), not the diff of `self.value`. This is important because `add_messages` handles removal and update-by-ID — replaying the writes with `operator` during reconstruction applies that logic correctly.
+
+### `checkpoint()`
+
+```python
+def checkpoint(self) -> DiffDelta:
+    return DiffDelta(
+        delta=self._pending[:],
+        prev_version=None if self._overwritten else self._base_version,
+    )
+```
+
+- Normal step: `prev_version = self._base_version` → chain link
+- After Overwrite: `prev_version = None` → chain root (reconstruction stops here and uses `delta` as the full base value)
+
+Returns `DiffDelta`, never the raw accumulated list. The serde handles serialization.
+
+### `from_checkpoint(checkpoint)`
+
+```python
+def from_checkpoint(self, checkpoint) -> Self:
+    new = DiffChannel(self.typ, self.operator)
+    new.key = self.key
+    if checkpoint is MISSING:
+        new.value = []
+    elif isinstance(checkpoint, DiffChainValue):
+        accumulated = checkpoint.base or []
+        for step_writes in checkpoint.deltas:
+            # Mirror update() exactly: apply each write individually so operator
+            # semantics (e.g. add_messages ID-based removal) are respected.
+            for write in step_writes:
+                accumulated = new.operator(accumulated, write)
+        new.value = accumulated
+    elif isinstance(checkpoint, DiffDelta):
+        # Unsupported saver: _load_blobs returned a raw DiffDelta instead of
+        # assembling a DiffChainValue. Raise rather than silently losing history.
+        raise ValueError(
+            "DiffChannel received a raw DiffDelta from the checkpoint saver. "
+            "Your saver does not support incremental channel storage. "
+            "Use InMemorySaver or PostgresSaver."
+        )
+    else:
+        # Backwards compat: plain list from old BinaryOperatorAggregate checkpoint.
+        new.value = checkpoint
+    new._pending = []
+    new._base_version = None  # set by the subsequent after_checkpoint() call
+    return new
+```
+
+The operator is available on `self` (the channel spec) so reconstruction is correct for any reducer — the saver never needs to know about `add_messages`.
+
+`_pending` stores **individual writes** (each `value` from `update()`'s `values` sequence), so each `step_writes` list in `DiffChainValue.deltas` is replayed write-by-write — identical to the `update()` loop.
+
+### `after_checkpoint(version)`
+
+```python
+def after_checkpoint(self, version: Any) -> None:
+    if version != self._base_version:
+        self._base_version = version
+        self._pending = []
+        self._overwritten = False
+```
+
+No-op when `version == self._base_version` (channel wasn't updated this step — blob was not written). Clears `_pending` and advances `_base_version` when the channel was actually checkpointed.
+
+### Opt-in API
+
+```python
+from langgraph.channels.diff import DiffChannel
+
+class State(TypedDict):
+    messages: Annotated[list[AnyMessage], DiffChannel(add_messages)]
+```
+
+`StateGraph` already handles `BaseChannel` instances as annotation metadata — `DiffChannel` inherits this without any changes to `StateGraph`.
+
+---
+
+## Serde Extension
+
+**Location:** `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py`
+
+Add one branch to `dumps_typed` (before the `else` msgpack fallback), using the existing module-level `_msgpack_enc` so message ext-types (Pydantic v2, etc.) are handled correctly:
+
+```python
+elif isinstance(obj, DiffDelta):
+    return "diff", _msgpack_enc({"d": obj.delta, "p": obj.prev_version})
+```
+
+Add one branch to `loads_typed` so savers can decode diff blobs without importing `ormsgpack` directly:
+
+```python
+elif type_ == "diff":
+    return ormsgpack.unpackb(
+        data_, ext_hook=self._unpack_ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+    )
+    # returns {"d": [writes...], "p": prev_version_str_or_none}
+```
+
+Savers call `serde.loads_typed(("diff", raw_bytes))` to decode a diff blob into `{"d": ..., "p": ...}`, then check `type_tag == "diff"` to trigger chain traversal. The serde layer is the only place that knows about `ormsgpack`.
+
+---
+
+## Saver Changes
+
+### InMemorySaver
+
+**`put()` — `libs/checkpoint/langgraph/checkpoint/memory/__init__.py`**
+
+No change needed. The existing `self.serde.dumps_typed(values[k])` call already handles `DiffDelta` via the new serde branch above, storing it as `("diff", bytes)`.
+
+**`_load_blobs()` — same file**
+
+After checking `vv[0] != "empty"`, add a branch for `"diff"` before calling `serde.loads_typed`:
+
+```python
+def _load_blobs(self, thread_id, checkpoint_ns, versions):
+    channel_values = {}
+    diff_channels = {}  # channel_name -> current_version for diff channels
+
+    for k, v in versions.items():
+        kk = (thread_id, checkpoint_ns, k, v)
+        if kk not in self.blobs:
+            continue
+        type_tag, blob_bytes = self.blobs[kk]
+        if type_tag == "diff":
+            diff_channels[k] = v  # handle below
+        elif type_tag != "empty":
+            channel_values[k] = self.serde.loads_typed((type_tag, blob_bytes))
+
+    for k, current_version in diff_channels.items():
+        # Follow chain: newest → oldest, then reverse
+        chain_deltas = []
+        base = None
+        version = current_version
+        while version is not None:
+            kk = (thread_id, checkpoint_ns, k, version)
+            if kk not in self.blobs:
+                break
+            type_tag, blob_bytes = self.blobs[kk]
+            if type_tag == "diff":
+                # Use serde so we don't need to import ormsgpack directly
+                payload = self.serde.loads_typed((type_tag, blob_bytes))
+                chain_deltas.append(payload["d"])
+                version = payload["p"]  # prev_version; None = root
+            else:
+                # Old non-diff blob encountered: treat as base accumulated value
+                base = self.serde.loads_typed((type_tag, blob_bytes))
+                break
+        chain_deltas.reverse()
+        channel_values[k] = DiffChainValue(base=base, deltas=chain_deltas)
+
+    return channel_values
+```
+
+Each blob lookup is O(1) on the dict. Total: N dict lookups for a chain of depth N. Memory usage is identical to loading a single full-list blob (same total bytes, split across N entries).
+
+### PostgresSaver
+
+**`_load_blobs()` — `libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py`**
+
+The existing `SELECT_SQL` fetches one blob per channel via a JOIN. After running that query, detect any `"diff"` channels in the result and issue one additional range query:
+
+```python
+def _load_blobs(self, blob_values):
+    if not blob_values:
+        return {}
+
+    result = {}
+    diff_channels = {}  # channel_name -> current_version (as str)
+
+    for k, t, v in blob_values:
+        channel = k.decode()
+        type_tag = t.decode()
+        if type_tag == "diff":
+            # Decode via serde — no direct ormsgpack import needed
+            payload = self.serde.loads_typed((type_tag, v))
+            diff_channels[channel] = payload  # store for chain fetch
+        elif type_tag != "empty":
+            result[channel] = self.serde.loads_typed((type_tag, v))
+
+    if diff_channels:
+        result.update(self._load_diff_chains(diff_channels))
+
+    return result
+```
+
+`_load_diff_chains` issues one SQL query per diff channel (typically just `messages`):
+
+```sql
+SELECT version, type, blob
+FROM checkpoint_blobs
+WHERE thread_id = %s
+  AND checkpoint_ns = %s
+  AND channel = %s
+  AND version <= %s
+ORDER BY version ASC
+```
+
+In Python, iterate rows in ascending version order: if `type = "diff"`, accumulate the delta; if any other type is encountered, treat it as the base accumulated value and stop. Return `DiffChainValue(base=..., deltas=[...])`.
+
+This results in **at most 2 queries total** for a graph with one `DiffChannel` — existing behaviour for all other channels is unchanged.
+
+**`put()` / `_dump_blobs()`**
+
+No change needed. `_dump_blobs` calls `self.serde.dumps_typed(v)` for each channel value in `new_versions`. When `v` is a `DiffDelta`, the serde produces `("diff", bytes)` which is stored as `type = "diff"` in `checkpoint_blobs`. The `ON CONFLICT DO NOTHING` semantics are preserved.
+
+### SQLite
+
+Deferred. `SqliteSaver` stores the entire checkpoint as a single serialized row — it has no per-channel blob table. Supporting `DiffChannel` on SQLite would require adding a new blobs table, which is a separate migration tracked separately.
+
+---
+
+## Pregel Layer Changes
+
+### `channels_from_checkpoint` — `libs/langgraph/langgraph/pregel/_checkpoint.py`
+
+After constructing each channel from its checkpoint value, call `after_checkpoint` so the channel records its current version:
+
+```python
+channels = {}
+for k, v in channel_specs.items():
+    ch = v.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
+    ch.after_checkpoint(checkpoint["channel_versions"].get(k))
+    channels[k] = ch
+return channels, managed_specs
+```
+
+Existing channels get the no-op `after_checkpoint`. `DiffChannel` uses it to set `_base_version`.
+
+### `PregelLoop._put_checkpoint` — `libs/langgraph/langgraph/pregel/_loop.py`
+
+After `create_checkpoint(self.checkpoint, self.channels, self.step, ...)` returns and `do_checkpoint is True` and `self.channels is not None`, iterate channels and notify:
+
+```python
+if do_checkpoint and self.channels:
+    for k, ch in self.channels.items():
+        ch.after_checkpoint(self.checkpoint["channel_versions"].get(k))
+```
+
+This is called after `create_checkpoint` updates `self.checkpoint["channel_versions"]`, so `get(k)` returns the new version for updated channels and the old version for unchanged ones. `DiffChannel.after_checkpoint` only clears `_pending` when `version != _base_version`, so unchanged channels are no-ops.
+
+---
+
+## Backwards Compatibility
+
+| Scenario | Behaviour |
+|---|---|
+| Existing graph using `add_messages` (BinaryOperatorAggregate) | Unaffected — no code changes, no data migration |
+| New graph with `DiffChannel`, loading old checkpoint blobs | `from_checkpoint` receives a plain `list` → used directly as accumulated value |
+| `DiffChannel` with `InMemorySaver` or `PostgresSaver` | Fully supported |
+| `DiffChannel` with `SqliteSaver` | `from_checkpoint` receives a raw `DiffDelta` (SqliteSaver stores channel_values inline), raises `ValueError` with a clear message pointing to supported savers |
+| Time-travel / fork to past checkpoint | Chain traversal uses the version at that checkpoint → reconstruction is correct |
+| `update_state` | Treated as a normal step: writes are deltas chained to history |
+| `Overwrite` value | Resets chain: next blob has `prev_version=None`; reconstruction starts fresh |
+
+---
+
+## Testing Strategy
+
+1. **Unit tests for `DiffChannel`** (`libs/langgraph/tests/`):
+   - `update` → `checkpoint` → `after_checkpoint` → `checkpoint` lifecycle (2 steps, verify delta isolation)
+   - `from_checkpoint(DiffChainValue)` correctly replays multi-step chains using the operator
+   - `from_checkpoint(plain_list)` backwards-compat path
+   - `Overwrite` creates a root blob (`prev_version=None`) and reconstruction ignores prior chain
+   - `after_checkpoint` no-ops when version is unchanged
+
+2. **Integration tests with `InMemorySaver`** (`libs/langgraph/tests/`):
+   - 10-step conversation: verify final loaded state equals full accumulated messages
+   - Time-travel: fork to step 5, verify only messages 1–5 are present
+   - Mixed graph: some channels `BinaryOperatorAggregate`, one `DiffChannel` — both reconstruct correctly
+
+3. **Serde tests** (`libs/checkpoint/tests/`):
+   - `DiffDelta` round-trips through `dumps_typed` / saver storage
+   - Old `"msgpack"` blob for a channel → `DiffChannel.from_checkpoint` handles it
+
+4. **Postgres integration tests** (`libs/checkpoint-postgres/tests/`):
+   - Range query reconstructs correct full list after N steps
+   - Time-travel to checkpoint M reconstructs correct list of M messages
+
+---
+
+## Files Changed
+
+| File | Change |
+|---|---|
+| `libs/checkpoint/langgraph/checkpoint/base/__init__.py` | Add `DiffDelta`, `DiffChainValue` dataclasses |
+| `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py` | Add `"diff"` branch in `dumps_typed` |
+| `libs/checkpoint/langgraph/checkpoint/memory/__init__.py` | Chain traversal in `_load_blobs` |
+| `libs/langgraph/langgraph/channels/base.py` | Add no-op `after_checkpoint` method |
+| `libs/langgraph/langgraph/channels/diff.py` | **New file** — `DiffChannel` implementation |
+| `libs/langgraph/langgraph/channels/__init__.py` | Export `DiffChannel` |
+| `libs/langgraph/langgraph/pregel/_checkpoint.py` | Call `after_checkpoint` in `channels_from_checkpoint` |
+| `libs/langgraph/langgraph/pregel/_loop.py` | Call `after_checkpoint` after `create_checkpoint` |
+| `libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py` | Range-query chain reconstruction in `_load_blobs` |
@@ -63,7 +63,6 @@ The suite tests **base** capabilities (required) and **extended** capabilities (
 | `delete_for_runs` | no | `adelete_for_runs` |
 | `copy_thread` | no | `acopy_thread` |
 | `prune` | no | `aprune` |
-| `delta_channel_history` | no | `aget_delta_channel_history` |

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

@@ -23,7 +23,6 @@ class Capability(str, Enum):
    DELETE_FOR_RUNS = "delete_for_runs"
    COPY_THREAD = "copy_thread"
    PRUNE = "prune"
-    DELTA_CHANNEL_HISTORY = "delta_channel_history"


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

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


@@ -9,9 +9,6 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
    run_delete_thread_tests,
 )
-from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
-    run_delta_channel_history_tests,
-)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -27,5 +24,4 @@ __all__ = [
    "run_delete_for_runs_tests",
    "run_copy_thread_tests",
    "run_prune_tests",
-    "run_delta_channel_history_tests",
 ]
@@ -1,99 +0,0 @@
-"""Shared fixtures for delta-channel conformance tests.
-
-Builds a parent chain with `_DeltaSnapshot` blobs at known positions via
-direct `aput` / `aput_writes` calls. No langgraph or Pregel dependency.
-"""
-
-from __future__ import annotations
-
-from collections.abc import Sequence
-from typing import Any
-from uuid import uuid4
-
-from langchain_core.runnables import RunnableConfig
-from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
-from langgraph.checkpoint.base.id import uuid6
-
-from langgraph.checkpoint.conformance.test_utils import generate_metadata
-
-
-async def build_delta_chain(
-    saver: BaseCheckpointSaver,
-    *,
-    thread_id: str | None = None,
-    checkpoint_ns: str = "",
-    channel: str = "messages",
-    snapshots_at_steps: Sequence[int] = (0,),
-    total_steps: int = 6,
-    write_value_fn: Any | None = None,
-) -> list[RunnableConfig]:
-    """Build a parent chain with `_DeltaSnapshot` at known positions.
-
-    Args:
-        saver: Checkpointer instance.
-        thread_id: Defaults to a random UUID.
-        checkpoint_ns: Namespace (default root).
-        channel: Channel name used for snapshots and writes.
-        snapshots_at_steps: Steps at which a `_DeltaSnapshot` blob is stored
-            in `channel_values[channel]`. Step 0 is the oldest checkpoint.
-        total_steps: Number of checkpoints in the chain.
-        write_value_fn: Callable(step) -> write value. Defaults to step index.
-
-    Returns:
-        List of stored configs (oldest first), one per step.
-    """
-    if write_value_fn is None:
-
-        def write_value_fn(step: int) -> Any:
-            return step
-
-    from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-    thread_id = thread_id or str(uuid4())
-    snapshot_set = set(snapshots_at_steps)
-    stored: list[RunnableConfig] = []
-    parent_cfg: RunnableConfig | None = None
-
-    for step in range(total_steps):
-        config: RunnableConfig = {
-            "configurable": {
-                "thread_id": thread_id,
-                "checkpoint_ns": checkpoint_ns,
-            }
-        }
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-
-        channel_values: dict[str, Any] = {}
-        channel_versions: dict[str, int] = {}
-        if step in snapshot_set:
-            channel_values[channel] = _DeltaSnapshot(
-                write_value_fn(step),
-            )
-            channel_versions[channel] = step + 1
-
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=channel_values,
-            channel_versions=channel_versions,
-            versions_seen={},
-            updated_channels=None,
-        )
-        new_versions = dict(channel_versions)
-        parent_cfg = await saver.aput(
-            config, cp, generate_metadata(step=step), new_versions
-        )
-        stored.append(parent_cfg)
-
-        # Write a pending write for non-snapshot steps so the walk has
-        # something to collect.
-        if step not in snapshot_set:
-            await saver.aput_writes(
-                parent_cfg, [(channel, write_value_fn(step))], str(uuid4())
-            )
-
-    return stored
@@ -1,247 +0,0 @@
-"""DELTA_CHANNEL_HISTORY capability tests — aget_delta_channel_history contract."""
-
-from __future__ import annotations
-
-import traceback
-from collections.abc import Callable
-from uuid import uuid4
-
-from langgraph.checkpoint.base import BaseCheckpointSaver
-
-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
@@ -19,9 +19,6 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
    run_delete_thread_tests,
 )
-from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
-    run_delta_channel_history_tests,
-)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -38,7 +35,6 @@ _RUNNERS = {
    Capability.DELETE_FOR_RUNS: run_delete_for_runs_tests,
    Capability.COPY_THREAD: run_copy_thread_tests,
    Capability.PRUNE: run_prune_tests,
-    Capability.DELTA_CHANNEL_HISTORY: run_delta_channel_history_tests,
 }


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

@@ -62,9 +58,6 @@ 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/"
@@ -2,9 +2,9 @@ from __future__ import annotations

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

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

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

 Conn = _internal.Conn  # For backward compatibility
@@ -310,10 +302,7 @@ class PostgresSaver(BasePostgresSaver):
        # others are stored in blobs table
        blob_values = {}
        for k, v in checkpoint["channel_values"].items():
-            if isinstance(v, _DeltaSnapshot):
-                blob_values[k] = copy["channel_values"].pop(k)
-                copy["channel_values"][k] = True
-            elif v is None or isinstance(v, (str, int, float, bool)):
+            if v is None or isinstance(v, (str, int, float, bool)):
                pass
            else:
                blob_values[k] = copy["channel_values"].pop(k)
@@ -441,113 +430,42 @@ 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
-
+    def get_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        """Look up a channel blob by checkpoint ID + channel via checkpoint_blobs."""
        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(
+            cur.execute(
+                """
+                SELECT cb.type, cb.blob
+                FROM checkpoint_blobs cb
+                WHERE cb.thread_id = %s
+                  AND cb.checkpoint_ns = %s
+                  AND cb.channel = %s
+                  AND cb.version = (
+                      SELECT checkpoint->'channel_versions'->>%s
+                      FROM checkpoints
+                      WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
+                  )
+                """,
+                (
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
                    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),
-        )
+                ),
+            )
+            row = cur.fetchone()
+        if row is None:
+            return NotImplemented
+        return self.serde.loads_typed((row["type"], row["blob"]))

    def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
        """
@@ -561,6 +479,13 @@ class PostgresSaver(BasePostgresSaver):
            including its configuration, metadata, parent checkpoint (if any),
            and pending writes.
        """
+        with self._cursor() as cur:
+            channel_values = self._load_blobs(
+                value["channel_values"],
+                thread_id=value["thread_id"],
+                checkpoint_ns=value["checkpoint_ns"],
+                cur=cur,
+            )
        return CheckpointTuple(
            {
                "configurable": {
@@ -573,7 +498,7 @@ class PostgresSaver(BasePostgresSaver):
                **value["checkpoint"],
                "channel_values": {
                    **(value["checkpoint"].get("channel_values") or {}),
-                    **self._load_blobs(value["channel_values"]),
+                    **channel_values,
                },
            },
            value["metadata"],
@@ -2,9 +2,9 @@ from __future__ import annotations

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

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

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

 Conn = _ainternal.Conn  # For backward compatibility
@@ -269,10 +261,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
        # others are stored in blobs table
        blob_values = {}
        for k, v in checkpoint["channel_values"].items():
-            if isinstance(v, _DeltaSnapshot):
-                blob_values[k] = copy["channel_values"].pop(k)
-                copy["channel_values"][k] = True
-            elif v is None or isinstance(v, (str, int, float, bool)):
+            if v is None or isinstance(v, (str, int, float, bool)):
                pass
            else:
                blob_values[k] = copy["channel_values"].pop(k)
@@ -402,96 +391,42 @@ 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 def aget_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        """Async look up of a channel blob by checkpoint ID + channel name."""
        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(
+            await cur.execute(
+                """
+                SELECT cb.type, cb.blob
+                FROM checkpoint_blobs cb
+                WHERE cb.thread_id = %s
+                  AND cb.checkpoint_ns = %s
+                  AND cb.channel = %s
+                  AND cb.version = (
+                      SELECT checkpoint->'channel_versions'->>%s
+                      FROM checkpoints
+                      WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
+                  )
+                """,
+                (
+                    thread_id,
+                    checkpoint_ns,
+                    channel,
+                    channel,
+                    thread_id,
+                    checkpoint_ns,
                    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),
-        )
+                ),
+            )
+            row = await cur.fetchone()
+        if row is None:
+            return NotImplemented
+        return self.serde.loads_typed((row["type"], row["blob"]))

    async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
        """
@@ -505,11 +440,19 @@ class AsyncPostgresSaver(BasePostgresSaver):
            including its configuration, metadata, parent checkpoint (if any),
            and pending writes.
        """
+        thread_id = value["thread_id"]
+        checkpoint_ns = value["checkpoint_ns"]
+        blob_values = value["channel_values"]
+
+        channel_values: dict[str, Any] = {}
+        if blob_values:
+            channel_values = self._load_blobs(blob_values)
+
        return CheckpointTuple(
            {
                "configurable": {
-                    "thread_id": value["thread_id"],
-                    "checkpoint_ns": value["checkpoint_ns"],
+                    "thread_id": thread_id,
+                    "checkpoint_ns": checkpoint_ns,
                    "checkpoint_id": value["checkpoint_id"],
                }
            },
@@ -517,15 +460,15 @@ class AsyncPostgresSaver(BasePostgresSaver):
                **value["checkpoint"],
                "channel_values": {
                    **(value["checkpoint"].get("channel_values") or {}),
-                    **self._load_blobs(value["channel_values"]),
+                    **channel_values,
                },
            },
            value["metadata"],
            (
                {
                    "configurable": {
-                        "thread_id": value["thread_id"],
-                        "checkpoint_ns": value["checkpoint_ns"],
+                        "thread_id": thread_id,
+                        "checkpoint_ns": checkpoint_ns,
                        "checkpoint_id": value["parent_checkpoint_id"],
                    }
                }
@@ -2,26 +2,20 @@ from __future__ import annotations

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

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

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

 try:
@@ -159,141 +153,6 @@ INSERT_CHECKPOINT_WRITES_SQL = """
 """


-class _DeltaStage2Row(TypedDict, total=False):
-    """One row from `_build_delta_stage2_sql` (a UNION ALL of writes and blobs)."""
-
-    _kind: str  # "w" or "b"
-    checkpoint_id: str | None  # "w" rows only
-    channel: str | None  # set on both "w" and "b" rows
-    type: str | None
-    blob: bytes | None
-    task_id: str | None  # "w" rows only
-    idx: int | None  # "w" rows only
-    version: str | None  # "b" rows only
-
-
-# Multi-channel two-stage DeltaChannel reconstruction.
-#
-# Stage 1 scans checkpoint metadata (no blob bytes) and emits one row per
-# checkpoint with K parallel JSONB key lookups (one column pair per
-# requested delta channel: ver_i / hs_i).  No subqueries, no aggregation.
-# Python walks the parent chain once across all channels.
-#
-# Stage 2 fetches all writes and the seed blobs for ALL channels in a
-# single roundtrip via `channel = ANY(%s)` and chain/seed-version
-# filtering.
-#
-# Empirical comparison vs an alternative "ship full channel_versions /
-# channel_values JSONB and let Python pick" form (1000 checkpoints,
-# 8 total channels in graph, 3 delta channels requested):
-#
-#   Postgres execution:    A=0.24ms vs B=0.38ms   (both negligible)
-#   End-to-end latency:    A=6.83ms vs B=2.28ms   (B is 3.0x faster)
-#   Wire payload:          A=836KB  vs B=330KB    (61% smaller)
-#   Buffer hits:           identical (167 blocks)
-#
-# B (this dynamic-columns design) wins because it avoids JSONB
-# serialization on the wire and JSONB-to-dict deserialization in
-# psycopg.  Even at K=8 (8 delta channels = 16 dynamic columns), B
-# still beats A end-to-end (4.2ms vs 6.8ms).
-
-
-def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
-    """Build stage 1 SQL with 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
@@ -326,154 +185,21 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
        )

    def _load_blobs(
-        self, blob_values: list[tuple[bytes, bytes, bytes]]
+        self,
+        blob_values: list[tuple[bytes, bytes, bytes]],
+        *,
+        thread_id: str = "",
+        checkpoint_ns: str = "",
+        cur: Any = None,
    ) -> dict[str, Any]:
        if not blob_values:
            return {}
-        return {
-            k.decode(): self.serde.loads_typed((t.decode(), v))
-            for k, t, v in blob_values
-            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
+        result: dict[str, Any] = {}
+        for k, t, v in blob_values:
+            channel = k.decode()
+            type_tag = t.decode()
+            if type_tag != "empty":
+                result[channel] = self.serde.loads_typed((type_tag, v))
        return result

    def _dump_blobs(
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.0"
+version = "3.0.5"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=4.1.0,<5.0.0",
+  "langgraph-checkpoint>=2.1.2,<5.0.0",
  "orjson>=3.11.5",
  "psycopg>=3.2.0",
  "psycopg-pool>=3.2.0",
@@ -20,7 +20,7 @@ dependencies = [

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

@@ -361,9 +361,9 @@ async def test_get_checkpoint_no_channel_values(

        load_checkpoint_tuple = saver._load_checkpoint_tuple

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

        monkeypatch.setattr(
            saver, "_load_checkpoint_tuple", patched_load_checkpoint_tuple
@@ -385,11 +385,11 @@ async def test_delta_channel_chain_reconstruction(saver_name: str) -> None:
    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 langgraph.graph.message import add_messages
    from typing_extensions import TypedDict

    class State(TypedDict):
-        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+        messages: Annotated[list, DeltaChannel(add_messages)]

    def respond(state: State) -> dict:
        n = len(state["messages"])
@@ -1,10 +1,6 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
-resolution-markers = [
-    "python_full_version >= '3.15'",
-    "python_full_version < '3.15'",
-]

 [[package]]
 name = "annotated-types"
@@ -205,11 +201,11 @@ wheels = [

 [[package]]
 name = "idna"
-version = "3.15"
+version = "3.11"
 source = { registry = "https://pypi.org/simple" }
-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" }
+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" }
 wheels = [
-    { 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" },
+    { 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" },
 ]

 [[package]]
@@ -244,11 +240,10 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.3.3"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
-    { name = "langchain-protocol" },
    { name = "langsmith" },
    { name = "packaging" },
    { name = "pydantic" },
@@ -257,26 +252,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-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" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/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" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.0.2"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -324,7 +307,7 @@ test = [

 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.0"
+version = "3.0.5"
 source = { editable = "." }
 dependencies = [
    { name = "langgraph-checkpoint" },
@@ -399,7 +382,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.8.0"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -412,9 +395,9 @@ dependencies = [
    { name = "xxhash" },
    { name = "zstandard" },
 ]
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 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
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 [[package]]
@@ -504,7 +487,7 @@ wheels = [

 [[package]]
 name = "mypy"
-version = "1.20.2"
+version = "1.20.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "librt", marker = "platform_python_implementation != 'PyPy'" },
@@ -513,51 +496,51 @@ dependencies = [
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    { name = "typing-extensions" },
 ]
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 [[package]]
@@ -4,7 +4,7 @@ import json
 import random
 import sqlite3
 import threading
-from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import closing, contextmanager
 from typing import Any, cast

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

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

 _AIO_ERROR_MSG = (
@@ -500,88 +493,6 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                (str(thread_id),),
            )

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

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

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

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

 T = TypeVar("T", bound=Callable)
@@ -279,29 +272,6 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
            self.adelete_thread(thread_id), self.loop
        ).result()

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

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

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

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint-sqlite"
-version = "3.1.0"
+version = "3.0.3"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,14 +12,14 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=4.1.0,<5.0.0",
+    "langgraph-checkpoint>=3,<5.0.0",
    "aiosqlite>=0.20",
    "sqlite-vec>=0.1.6",
 ]

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

@@ -1,35 +0,0 @@
-"""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}")
@@ -1,170 +0,0 @@
-"""Sqlite-specific migration smoke tests: BinaryOperatorAggregate -> DeltaChannel.
-
-Mirrors `libs/langgraph/tests/test_delta_channel_migration.py` (which
-covers `InMemorySaver` + a third-party fallback to the base default
-impl). This file exercises the same migration scenario through the
-sqlite-specific `SqliteSaver.get_delta_channel_history` override —
-specifically that the streaming ancestor walk finds a pre-migration
-plain `channel_values[ch]` entry and surfaces it as the `seed`, with
-post-migration writes folding on top through the reducer.
-
-Pre-migration checkpoints under `BinaryOperatorAggregate` carry the
-full accumulated value at every settled super-step boundary. The
-override has to identify those as "real" seeds (not `_DeltaSnapshot`
-sentinels) — the saver layer is intentionally delta-agnostic and just
-returns whatever is stored in `channel_values[ch]`.
-"""
-
-from __future__ import annotations
-
-import operator
-from typing import Annotated, Any
-
-import pytest
-from langchain_core.runnables import RunnableConfig
-
-# `langgraph` core isn't a dep of `langgraph-checkpoint-sqlite`. Skip the
-# whole module rather than importerror-ing in the standalone CI shape.
-pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
-pytest.importorskip("langgraph.channels.binop", reason="langgraph core not installed")
-pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
-
-from langgraph.channels.binop import BinaryOperatorAggregate  # type: ignore[import-untyped]  # noqa: 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']}"
-            )
@@ -1,271 +0,0 @@
-"""Smoke tests for `BaseCheckpointSaver.get_delta_channel_history` on sqlite.
-
-`SqliteSaver` (and `AsyncSqliteSaver`) deliberately don't override the
-default implementation in `BaseCheckpointSaver` — these tests pin the
-default impl to behave correctly end-to-end against a real persistent
-saver and a real `DeltaChannel`-backed graph.
-
-Scenarios covered:
-
-* Empty `channels` argument returns an empty mapping (no I/O).
-* On a non-trivial multi-checkpoint thread, per-channel writes come back
-  oldest→newest.
-* When the walk reaches the root without ever finding a stored value,
-  `seed` is omitted from the entry (consumer treats absence as "start
-  empty").
-* When a `_DeltaSnapshot` blob is present at an ancestor, it is returned
-  as the `seed`.
-* The async saver returns the same shape via `aget_delta_channel_history`.
-"""
-
-from __future__ import annotations
-
-import operator
-from typing import Annotated, Any
-
-import pytest
-from langchain_core.runnables import RunnableConfig
-
-# `langgraph` is not a dep of `langgraph-checkpoint-sqlite`. When tests run
-# in the sqlite lib's standalone CI environment without it installed, skip
-# the whole module rather than failing at import.
-pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
-pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
-
-from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: 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"] == []
@@ -1,10 +1,6 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
-resolution-markers = [
-    "python_full_version >= '3.15'",
-    "python_full_version < '3.15'",
-]

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 name = "aiosqlite"
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-version = "1.3.3"
+version = "1.2.28"
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    { name = "jsonpatch" },
-    { name = "langchain-protocol" },
    { name = "langsmith" },
    { name = "packaging" },
    { name = "pydantic" },
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-[[package]]
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-version = "0.0.15"
-source = { registry = "https://pypi.org/simple" }
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 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.0.2"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -333,7 +316,7 @@ test = [

 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "3.1.0"
+version = "3.0.3"
 source = { editable = "." }
 dependencies = [
    { name = "aiosqlite" },
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-version = "0.8.0"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
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+version = "1.20.0"
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 [[package]]
@@ -1161,11 +1144,11 @@ wheels = [

 [[package]]
 name = "urllib3"
-version = "2.7.0"
+version = "2.6.3"
 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" }
+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" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/39/08/aaaad47bc4e9dc8c725e68f9d04865dbcb2052843ff09c97b08904852d84/urllib3-2.6.3-py3-none-any.whl", hash = "sha256:bf272323e553dfb2e87d9bfd225ca7b0f467b919d7bbd355436d3fd37cb0acd4", size = 131584, upload-time = "2026-01-07T16:24:42.685Z" },
 ]

 [[package]]
@@ -1,9 +1,11 @@
 from __future__ import annotations

+import asyncio
 import copy
+import dataclasses
 import logging
 from collections.abc import AsyncIterator, Collection, Iterator, Mapping, Sequence
-from typing import (
+from typing import (  # noqa: UP035
    Any,
    Generic,
    Literal,
@@ -13,7 +15,6 @@ from typing import (
 )

 from langchain_core.runnables import RunnableConfig
-from typing_extensions import NotRequired

 from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_methods
@@ -31,7 +32,44 @@ V = TypeVar("V", int, float, str)
 PendingWrite = tuple[str, str, Any]


+@dataclasses.dataclass
+class DeltaValue:
+    """Returned by DeltaChannel.checkpoint(). Represents one step's writes."""
+
+    delta: list[Any]
+    prev_checkpoint_id: (
+        str | None
+    )  # ID of checkpoint containing previous blob; None = chain root
+
+
+@dataclasses.dataclass
+class DeltaChainValue:
+    """Passed to DeltaChannel.from_checkpoint(). Assembled during checkpoint hydration."""
+
+    base: list[Any] | None  # starting accumulated value; None = start from empty
+    deltas: list[list[Any]]  # per-step write-sets, ordered oldest → newest
+
+
+CheckpointHydrationKind = Literal["delta"]
+
+
+@dataclasses.dataclass(frozen=True)
+class IncrementalChannelSpec:
+    """Describes a checkpoint field that needs saver-side materialization."""
+
+    name: str
+    kind: CheckpointHydrationKind
+
+
+@dataclasses.dataclass(frozen=True)
+class CheckpointHydrationPlan:
+    """Lists the checkpoint fields eligible for saver-side materialization."""
+
+    channels: tuple[IncrementalChannelSpec, ...]
+
+
 logger = logging.getLogger(__name__)
+_MISSING_SENTINEL = object()


 # Marked as total=False to allow for future expansion.
@@ -60,30 +98,6 @@ class CheckpointMetadata(TypedDict, total=False):
    """
    run_id: str
    """The ID of the run that created this checkpoint."""
-    counters_since_delta_snapshot: dict[str, tuple[int, int]]
-    """Per-channel counters since the last `_DeltaSnapshot` was written.
-
-    !!! warning "Beta"
-
-        This metadata field backs `DeltaChannel` (beta). The key name and
-        contents may change while the delta-channel design stabilizes.
-
-    Maps channel name -> `(updates, supersteps)`:
-
-    - index 0 (`updates`): number of supersteps that wrote to this channel
-      since its last snapshot blob.
-    - index 1 (`supersteps`): total supersteps elapsed since this channel's
-      last snapshot, regardless of whether the channel was written.
-
-    A snapshot fires when EITHER `updates >= ch.snapshot_frequency` OR
-    `supersteps >= DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT` (system-wide bound,
-    default 5000, env `LANGGRAPH_DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`).
-    The supersteps bound prevents unbounded ancestor walks on threads where
-    a delta channel exists but is no longer being updated.
-
-    Absent on threads that don't use delta channels. Persisted as a
-    2-element list in JSON (no native tuple).
-    """


 ChannelVersions = dict[str, str | int | float]
@@ -146,33 +160,6 @@ class CheckpointTuple(NamedTuple):
    pending_writes: list[PendingWrite] | None = None


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

@@ -336,14 +323,6 @@ class BaseCheckpointSaver(Generic[V]):

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

@@ -357,17 +336,6 @@ class BaseCheckpointSaver(Generic[V]):
        Args:
            source_thread_id: The thread ID to copy from.
            target_thread_id: The thread ID to copy to.
-
-        !!! warning "DeltaChannel"
-
-            Implementations must copy the **complete** parent chain (all
-            ancestor checkpoints and their `checkpoint_writes`) — copying
-            only the head checkpoint will leave the target thread with
-            `DeltaChannel` state that cannot be reconstructed (no path back
-            to a `_DeltaSnapshot` ancestor). Equivalently, the copy must
-            include enough ancestors that every `DeltaChannel`-backed key
-            has either a `_DeltaSnapshot` in `channel_values` somewhere in
-            the chain, or a complete write history back to the chain root.
        """
        raise NotImplementedError

@@ -383,34 +351,6 @@ class BaseCheckpointSaver(Generic[V]):
            thread_ids: The thread IDs to prune.
            strategy: The pruning strategy. `"keep_latest"` retains only the most
                recent checkpoint per namespace. `"delete"` removes all checkpoints.
-
-        !!! warning "DeltaChannel"
-
-            Custom implementations must be `DeltaChannel`-aware. `DeltaChannel`
-            stores only a sentinel in `channel_values` for non-snapshot steps;
-            reconstruction walks the parent chain via
-            `get_delta_channel_history`, accumulating rows from
-            `checkpoint_writes` until it reaches an ancestor whose
-            `channel_values` contains a `_DeltaSnapshot` blob (written every
-            `snapshot_frequency` updates).
-
-            A naive `"keep_latest"` that drops intermediate checkpoints and
-            their writes can sever that chain: the surviving "latest"
-            checkpoint is rarely a snapshot point itself, so its delta
-            channels would silently reconstruct as empty (no error raised —
-            `get_delta_channel_history` simply returns no `seed`). Safe
-            options when the graph uses `DeltaChannel`:
-
-            * Walk back from each kept checkpoint and preserve every
-              ancestor (plus its `checkpoint_writes`) up to the nearest one
-              whose `channel_values` already contains a `_DeltaSnapshot` for
-              every `DeltaChannel`-backed key.
-            * Force a fresh snapshot on the kept checkpoint before deleting
-              ancestors — rewrite `channel_values[k] = _DeltaSnapshot(value)`
-              for each delta channel `k` (resolving `value` via the existing
-              ancestor walk first), then prune.
-            * Skip pruning threads whose graph uses `DeltaChannel` until one
-              of the above is implemented.
        """
        raise NotImplementedError

@@ -527,13 +467,6 @@ class BaseCheckpointSaver(Generic[V]):

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

@@ -547,13 +480,6 @@ class BaseCheckpointSaver(Generic[V]):
        Args:
            source_thread_id: The thread ID to copy from.
            target_thread_id: The thread ID to copy to.
-
-        !!! warning "DeltaChannel"
-
-            See `copy_thread` — the copy must carry the complete parent
-            chain (or at least back to a `_DeltaSnapshot` ancestor for every
-            `DeltaChannel`) so the target thread can reconstruct delta
-            state.
        """
        raise NotImplementedError

@@ -569,125 +495,174 @@ 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.
+    def materialize_checkpoint(
+        self,
+        config: RunnableConfig,
+        checkpoint: Checkpoint,
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> Checkpoint:
+        """Materialize any saver-managed incremental values in a checkpoint."""
+        if plan is None or not plan.channels:
+            return checkpoint

-        !!! warning "Beta"
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        current_checkpoint_id = checkpoint.get("id")
+        assembled: dict[str, Any] = {}

-            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 spec in plan.channels:
+            value = checkpoint["channel_values"].get(spec.name)
+            if spec.kind != "delta" or not isinstance(value, DeltaValue):
+                continue

-        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."
+            assembled_value = self._materialize_delta_channel(
+                thread_id=thread_id,
+                checkpoint_ns=checkpoint_ns,
+                current_checkpoint_id=current_checkpoint_id,
+                channel=spec.name,
+                value=value,
+            )
+            if assembled_value is not None:
+                assembled[spec.name] = assembled_value

-        Walks the **parent chain** (not `list(before=...)`): for forked
-        threads, only on-path ancestors contribute.
+        if not assembled:
+            return checkpoint

-        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.
+        return {
+            **checkpoint,
+            "channel_values": {**checkpoint["channel_values"], **assembled},
+        }

-        Args:
-            config: Configuration identifying the target checkpoint.
-            channels: Channel names to walk for. Empty → empty mapping.
+    def materialize_checkpoint_tuple(
+        self,
+        value: CheckpointTuple,
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> CheckpointTuple:
+        """Materialize incremental values for a single checkpoint tuple."""
+        checkpoint = self.materialize_checkpoint(value.config, value.checkpoint, plan)
+        if checkpoint is value.checkpoint:
+            return value
+        return value._replace(checkpoint=checkpoint)

-        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
+    def materialize_checkpoint_tuples(
+        self,
+        values: Sequence[CheckpointTuple],
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> Sequence[CheckpointTuple]:
+        """Materialize incremental values for a batch of checkpoint tuples."""
+        return [self.materialize_checkpoint_tuple(value, plan) for value in values]
+
+    async def amaterialize_checkpoint(
+        self,
+        config: RunnableConfig,
+        checkpoint: Checkpoint,
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> Checkpoint:
+        """Async materialization hook for saver-managed incremental values."""
+        if plan is None or not plan.channels:
+            return checkpoint
+
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        current_checkpoint_id = checkpoint.get("id")
+
+        targets = [
+            (spec, checkpoint["channel_values"][spec.name])
+            for spec in plan.channels
+            if spec.kind == "delta"
+            and isinstance(checkpoint["channel_values"].get(spec.name), DeltaValue)
+        ]
+        if not targets:
+            return checkpoint
+
+        # Walks for independent channels can run concurrently — each has its own chain.
+        results = await asyncio.gather(
+            *(
+                self._amaterialize_delta_channel(
+                    thread_id=thread_id,
+                    checkpoint_ns=checkpoint_ns,
+                    current_checkpoint_id=current_checkpoint_id,
+                    channel=spec.name,
+                    value=value,
+                )
+                for spec, value in targets
+            )
        )
-        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
+        assembled = {
+            spec.name: result
+            for (spec, _), result in zip(targets, results, strict=True)
+            if result is not None
+        }

-    async def aget_delta_channel_history(
-        self, *, config: RunnableConfig, channels: Sequence[str]
-    ) -> Mapping[str, DeltaChannelHistory]:
-        """Async version of `get_delta_channel_history`.
+        if not assembled:
+            return checkpoint

-        !!! warning "Beta"
+        return {
+            **checkpoint,
+            "channel_values": {**checkpoint["channel_values"], **assembled},
+        }

-            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
+    async def amaterialize_checkpoint_tuple(
+        self,
+        value: CheckpointTuple,
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> CheckpointTuple:
+        """Async materialization hook for a single checkpoint tuple."""
+        checkpoint = await self.amaterialize_checkpoint(
+            value.config, value.checkpoint, plan
        )
-        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
+        if checkpoint is value.checkpoint:
+            return value
+        return value._replace(checkpoint=checkpoint)
+
+    async def amaterialize_checkpoint_tuples(
+        self,
+        values: Sequence[CheckpointTuple],
+        plan: CheckpointHydrationPlan | None = None,
+    ) -> Sequence[CheckpointTuple]:
+        """Async materialization hook for a batch of checkpoint tuples."""
+        return [
+            await self.amaterialize_checkpoint_tuple(value, plan) for value in values
+        ]
+
+    def get_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        """Look up a single channel blob by checkpoint ID + channel name.
+
+        Returns NotImplemented if this saver does not support efficient
+        per-channel-version blob lookup. The pregel layer will fall back to
+        get_tuple() traversal in that case.
+
+        Savers with a dedicated blob store (InMemorySaver, PostgresSaver)
+        should override this for O(1) performance.
+        """
+        return NotImplemented
+
+    async def aget_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        """Look up a single channel blob by checkpoint ID + channel name (async).
+
+        Returns NotImplemented if this saver does not support efficient
+        per-channel-version blob lookup. The pregel layer will fall back to
+        aget_tuple() traversal in that case.
+
+        Savers with a dedicated blob store (InMemorySaver, PostgresSaver)
+        should override this for O(1) performance.
+        """
+        return NotImplemented

    def get_next_version(self, current: V | None, channel: None) -> V:
        """Generate the next version ID for a channel.
@@ -721,6 +696,138 @@ class BaseCheckpointSaver(Generic[V]):
        clone.serde = maybe_add_typed_methods(serde)
        return clone

+    def _materialize_delta_channel(
+        self,
+        *,
+        thread_id: str,
+        checkpoint_ns: str,
+        current_checkpoint_id: str | None,
+        channel: str,
+        value: DeltaValue,
+    ) -> DeltaChainValue | None:
+        chain_deltas: list[list[Any]] = []
+        base: list[Any] | None = None
+        cursor: DeltaValue = value
+        visited: set[str] = {current_checkpoint_id} if current_checkpoint_id else set()
+
+        while True:
+            chain_deltas.append(cursor.delta)
+            prev_id = cursor.prev_checkpoint_id
+            if prev_id is None:
+                break
+            if prev_id in visited:
+                logger.warning(
+                    "DeltaChannel chain cycle at checkpoint %r for channel %r; breaking",
+                    prev_id,
+                    channel,
+                )
+                break
+            visited.add(prev_id)
+
+            blob = self.get_channel_blob(thread_id, checkpoint_ns, prev_id, channel)
+            if blob is not NotImplemented:
+                if isinstance(blob, DeltaValue):
+                    cursor = blob
+                    continue
+                base = blob
+                break
+
+            parent_config: RunnableConfig = {
+                "configurable": {
+                    "thread_id": thread_id,
+                    "checkpoint_ns": checkpoint_ns,
+                    "checkpoint_id": prev_id,
+                }
+            }
+            parent_tuple = self.get_tuple(parent_config)
+            if parent_tuple is None:
+                logger.warning(
+                    "DeltaChannel chain broken: checkpoint %r not found for channel %r",
+                    prev_id,
+                    channel,
+                )
+                break
+            prev_val = parent_tuple.checkpoint["channel_values"].get(
+                channel, _MISSING_SENTINEL
+            )
+            if prev_val is _MISSING_SENTINEL:
+                break
+            if isinstance(prev_val, DeltaValue):
+                cursor = prev_val
+            else:
+                base = prev_val
+                break
+
+        chain_deltas.reverse()
+        return DeltaChainValue(base=base, deltas=chain_deltas)
+
+    async def _amaterialize_delta_channel(
+        self,
+        *,
+        thread_id: str,
+        checkpoint_ns: str,
+        current_checkpoint_id: str | None,
+        channel: str,
+        value: DeltaValue,
+    ) -> DeltaChainValue | None:
+        chain_deltas: list[list[Any]] = []
+        base: list[Any] | None = None
+        cursor: DeltaValue = value
+        visited: set[str] = {current_checkpoint_id} if current_checkpoint_id else set()
+
+        while True:
+            chain_deltas.append(cursor.delta)
+            prev_id = cursor.prev_checkpoint_id
+            if prev_id is None:
+                break
+            if prev_id in visited:
+                logger.warning(
+                    "DeltaChannel chain cycle at checkpoint %r for channel %r; breaking",
+                    prev_id,
+                    channel,
+                )
+                break
+            visited.add(prev_id)
+
+            blob = await self.aget_channel_blob(
+                thread_id, checkpoint_ns, prev_id, channel
+            )
+            if blob is not NotImplemented:
+                if isinstance(blob, DeltaValue):
+                    cursor = blob
+                    continue
+                base = blob
+                break
+
+            parent_config: RunnableConfig = {
+                "configurable": {
+                    "thread_id": thread_id,
+                    "checkpoint_ns": checkpoint_ns,
+                    "checkpoint_id": prev_id,
+                }
+            }
+            parent_tuple = await self.aget_tuple(parent_config)
+            if parent_tuple is None:
+                logger.warning(
+                    "DeltaChannel chain broken: checkpoint %r not found for channel %r",
+                    prev_id,
+                    channel,
+                )
+                break
+            prev_val = parent_tuple.checkpoint["channel_values"].get(
+                channel, _MISSING_SENTINEL
+            )
+            if prev_val is _MISSING_SENTINEL:
+                break
+            if isinstance(prev_val, DeltaValue):
+                cursor = prev_val
+            else:
+                base = prev_val
+                break
+
+        chain_deltas.reverse()
+        return DeltaChainValue(base=base, deltas=chain_deltas)
+

 def _with_msgpack_allowlist(
    serde: SerializerProtocol, extra_allowlist: Collection[tuple[str, ...]]
@@ -6,7 +6,7 @@ import pickle
 import random
 import shutil
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
+from collections.abc import AsyncIterator, Iterator, Sequence
 from contextlib import AbstractAsyncContextManager, AbstractContextManager, ExitStack
 from types import TracebackType
 from typing import Any
@@ -20,8 +20,6 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
-    DeltaChannelHistory,
-    PendingWrite,
    SerializerProtocol,
    get_checkpoint_id,
    get_checkpoint_metadata,
@@ -123,115 +121,50 @@ class InMemorySaver(
        return self.stack.__exit__(__exc_type, __exc_value, __traceback)

    def _load_blobs(
-        self,
-        thread_id: str,
-        checkpoint_ns: str,
-        versions: ChannelVersions,
+        self, thread_id: str, checkpoint_ns: str, versions: ChannelVersions
    ) -> dict[str, Any]:
-        result: dict[str, Any] = {}
-        for k, ver in versions.items():
-            kk = (thread_id, checkpoint_ns, k, ver)
+        channel_values: dict[str, Any] = {}
+        for k, v in versions.items():
+            kk = (thread_id, checkpoint_ns, k, v)
            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
+            if vv[0] != "empty":
+                channel_values[k] = self.serde.loads_typed(vv)
+        return channel_values

-    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", "")
+    def get_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        """Fast-path blob lookup: checkpoint → channel version → blob."""
        ns_storage = self.storage.get(thread_id, {}).get(checkpoint_ns, {})
+        entry = ns_storage.get(checkpoint_id)
+        if entry is None:
+            return NotImplemented
+        checkpoint = self.serde.loads_typed(entry[0])
+        version = checkpoint["channel_versions"].get(channel)
+        if version is None:
+            return NotImplemented
+        kk = (thread_id, checkpoint_ns, channel, version)
+        if kk not in self.blobs:
+            return NotImplemented
+        vv = self.blobs[kk]
+        if vv[0] == "empty":
+            return NotImplemented
+        return self.serde.loads_typed(vv)

-        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)
+    async def aget_channel_blob(
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        checkpoint_id: str,
+        channel: str,
+    ) -> Any:
+        return self.get_channel_blob(thread_id, checkpoint_ns, checkpoint_id, channel)

    def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
        """Get a checkpoint tuple from the in-memory storage.
@@ -73,7 +73,6 @@ SAFE_MSGPACK_TYPES: frozenset[tuple[str, ...]] = frozenset(
        ("langchain_core.documents.base", "Document"),
        # langgraph
        ("langgraph.types", "Send"),
-        ("langgraph.types", "TimeoutPolicy"),
        ("langgraph.types", "Interrupt"),
        ("langgraph.types", "Command"),
        ("langgraph.types", "StateSnapshot"),
@@ -81,6 +80,8 @@ SAFE_MSGPACK_TYPES: frozenset[tuple[str, ...]] = frozenset(
        ("langgraph.types", "Overwrite"),
        ("langgraph.store.base", "Item"),
        ("langgraph.store.base", "GetOp"),
+        # DeltaChannel checkpoint value type
+        ("langgraph.checkpoint.base", "DeltaValue"),
    }
 )

@@ -33,50 +33,24 @@ from langchain_core.load.load import Reviver
 from langgraph.checkpoint.serde import _msgpack as _lg_msgpack
 from langgraph.checkpoint.serde.base import SerializerProtocol
 from langgraph.checkpoint.serde.event_hooks import emit_serde_event
-from langgraph.checkpoint.serde.types import (
-    SendProtocol,
-    _DeltaSnapshot,
-)
+from langgraph.checkpoint.serde.types import SendProtocol
 from langgraph.store.base import Item

 if TYPE_CHECKING:
    from langgraph.checkpoint.serde._msgpack import (
        AllowedMsgpackModules,
    )
+    from langgraph.checkpoint.serde.types import SendProtocol

-LC_REVIVER = Reviver(allowed_objects="core")
+LC_REVIVER = Reviver()
 EMPTY_BYTES = b""
 logger = logging.getLogger(__name__)

-# Dedup log warnings across process lifetime; cap bounds state if types are
-# dynamically generated (also acts as a circuit breaker on warning volume).
-# Dedup is best-effort: racing threads may each emit once for the same key,
-# and warnings are silently dropped once _MAX_WARNED_TYPES is reached.
-_MAX_WARNED_TYPES = 1000
-_warned_unregistered_types: set[tuple[str, str]] = set()
-_warned_blocked_types: set[tuple[str, str]] = set()

+def _is_delta_value(obj: Any) -> bool:
+    from langgraph.checkpoint.base import DeltaValue  # lazy import avoids circular dep

-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)
+    return isinstance(obj, DeltaValue)


 class JsonPlusSerializer(SerializerProtocol):
@@ -157,24 +131,41 @@ class JsonPlusSerializer(SerializerProtocol):
            )
        return clone

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

        return LC_REVIVER(value)

@@ -182,57 +173,49 @@ class JsonPlusSerializer(SerializerProtocol):
        self._check_allowed_json_modules(value)

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

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

+        dotted = ".".join(needed)
        if not self._allowed_json_modules:
            raise InvalidModuleError(
-                f"Refused to deserialize JSON constructor: {dotted}. "
+                f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
                "No allowed_json_modules configured.\n\n"
                "Unblock with ONE of:\n"
                f"  • JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -247,7 +230,7 @@ class JsonPlusSerializer(SerializerProtocol):
            return

        raise InvalidModuleError(
-            f"Refused to deserialize JSON constructor: {dotted}. "
+            f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
            "Symbol is not in the deserialization allowlist.\n\n"
            "Add exactly this symbol to unblock:\n"
            f"  JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -262,6 +245,8 @@ class JsonPlusSerializer(SerializerProtocol):
            return "bytes", obj
        elif isinstance(obj, bytearray):
            return "bytearray", obj
+        elif _is_delta_value(obj):
+            return "delta", _msgpack_enc({"d": obj.delta, "c": obj.prev_checkpoint_id})
        else:
            try:
                return "msgpack", _msgpack_enc(obj)
@@ -284,6 +269,13 @@ class JsonPlusSerializer(SerializerProtocol):
            return ormsgpack.unpackb(
                data_, ext_hook=self._unpack_ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
            )
+        elif type_ == "delta":
+            from langgraph.checkpoint.base import DeltaValue  # lazy import
+
+            raw = ormsgpack.unpackb(
+                data_, ext_hook=self._unpack_ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+            )
+            return DeltaValue(delta=raw["d"], prev_checkpoint_id=raw.get("c"))
        elif self.pickle_fallback and type_ == "pickle":
            return pickle.loads(data_)
        else:
@@ -299,13 +291,10 @@ EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
 EXT_NUMPY_ARRAY = 6
-EXT_DELTA_SNAPSHOT = 7


 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
-    if isinstance(obj, _DeltaSnapshot):
-        return ormsgpack.Ext(EXT_DELTA_SNAPSHOT, _msgpack_enc(obj.value))
-    elif hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
+    if hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
        return ormsgpack.Ext(
            EXT_PYDANTIC_V2,
            _msgpack_enc(
@@ -477,13 +466,10 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
            ),
        )
    elif isinstance(obj, SendProtocol):
-        args: tuple[Any, ...] = (obj.node, obj.arg)
-        if (timeout := getattr(obj, "timeout", None)) is not None:
-            args = (obj.node, obj.arg, timeout)
        return ormsgpack.Ext(
            EXT_CONSTRUCTOR_POS_ARGS,
            _msgpack_enc(
-                (obj.__class__.__module__, obj.__class__.__name__, args),
+                (obj.__class__.__module__, obj.__class__.__name__, (obj.node, obj.arg)),
            ),
        )
    elif dataclasses.is_dataclass(obj):
@@ -534,15 +520,6 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
        raise TypeError(f"Object of type {obj.__class__.__name__} is not serializable")


-def _send_from_args(args: Sequence[Any]) -> Any:
-    # ya we have a cyclic import here ¯\_(ツ)_/¯
-    from langgraph.types import Send  # type: ignore
-
-    if len(args) == 2:
-        return Send(*args)
-    return Send(args[0], args[1], timeout=args[2])
-
-
 def _create_msgpack_ext_hook(
    allowed_modules: set[tuple[str, ...]] | Literal[True] | None,
 ) -> Callable[[int, bytes], Any]:
@@ -572,9 +549,7 @@ def _create_msgpack_ext_hook(
                    "name": name,
                }
            )
-            _warn_once(
-                _warned_unregistered_types,
-                key,
+            logger.warning(
                "Deserializing unregistered type %s.%s from checkpoint. "
                "This will be blocked in a future version. "
                "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
@@ -596,9 +571,7 @@ def _create_msgpack_ext_hook(
                "name": name,
            }
        )
-        _warn_once(
-            _warned_blocked_types,
-            key,
+        logger.warning(
            "Blocked deserialization of %s.%s - not in allowed_msgpack_modules. "
            "Add to allowed_msgpack_modules to allow: [(%r, %r)]",
            module,
@@ -631,13 +604,7 @@ def _create_msgpack_ext_hook(
        return False

    def ext_hook(code: int, data: bytes) -> Any:
-        if code == EXT_DELTA_SNAPSHOT:
-            return _DeltaSnapshot(
-                ormsgpack.unpackb(
-                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
-                )
-            )
-        elif code == EXT_CONSTRUCTOR_SINGLE_ARG:
+        if code == EXT_CONSTRUCTOR_SINGLE_ARG:
            try:
                tup = ormsgpack.unpackb(
                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
@@ -658,8 +625,6 @@ def _create_msgpack_ext_hook(
                )
                if not _check_allowed(tup[0], tup[1]):
                    return tup[2]
-                if tup[0] == "langgraph.types" and tup[1] == "Send":
-                    return _send_from_args(tup[2])
                # module, name, args
                return getattr(importlib.import_module(tup[0]), tup[1])(*tup[2])
            except Exception:
@@ -773,7 +738,9 @@ def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
                option=ormsgpack.OPT_NON_STR_KEYS,
            )
            if tup[0] == "langgraph.types" and tup[1] == "Send":
-                return _send_from_args(tup[2])
+                from langgraph.types import Send  # type: ignore
+
+                return Send(*tup[2])
            # module, name, args
            return tup[2]
        except Exception:
@@ -1,7 +1,6 @@
 from collections.abc import Sequence
 from typing import (
    Any,
-    NamedTuple,
    Protocol,
    TypeVar,
    runtime_checkable,
@@ -15,22 +14,6 @@ INTERRUPT = "__interrupt__"
 RESUME = "__resume__"
 TASKS = "__pregel_tasks"

-
-class _DeltaSnapshot(NamedTuple):
-    """Snapshot blob for a DeltaChannel with finite snapshot_frequency.
-
-    Stored in checkpoint_blobs via the `EXT_DELTA_SNAPSHOT` msgpack ext code.
-    The ancestor walk in `BaseCheckpointSaver.get_delta_channel_history` terminates
-    when it encounters this type (any non-empty channel_values entry stops
-    the walk for that channel).
-
-    `from_checkpoint` reconstructs the channel value directly from `.value`
-    without replaying writes — the snapshot IS the accumulated state.
-    """
-
-    value: Any
-
-
 Value = TypeVar("Value", covariant=True)
 Update = TypeVar("Update", contravariant=True)
 C = TypeVar("C")
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.0.2"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -18,7 +18,7 @@ dependencies = [

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

@@ -1,33 +0,0 @@
-"""Run delta-channel conformance capabilities against InMemorySaver."""
-
-from __future__ import annotations
-
-import pytest
-
-conformance = pytest.importorskip(
-    "langgraph.checkpoint.conformance",
-    reason="langgraph-checkpoint-conformance not installed",
-)
-
-
-@pytest.mark.asyncio
-async def test_delta_channel_conformance():
-    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}")
@@ -29,8 +29,6 @@ from langgraph.checkpoint.serde.jsonplus import (
    EXT_METHOD_SINGLE_ARG,
    JsonPlusSerializer,
    _msgpack_enc,
-    _warned_blocked_types,
-    _warned_unregistered_types,
 )


@@ -104,13 +102,6 @@ def test_msgpack_method_pathlib_blocked_encrypted_strict(
 class TestEncryptedSerializerMsgpackAllowlist:
    """Test msgpack allowlist behavior through EncryptedSerializer."""

-    @pytest.fixture(autouse=True)
-    def _reset_warned_types(self) -> None:
-        # Warning dedup state is process-global; reset per-test so each case
-        # sees a fresh slate and assertions about warning emission are stable.
-        _warned_unregistered_types.clear()
-        _warned_blocked_types.clear()
-
    def test_safe_types_no_warning(self, caplog: pytest.LogCaptureFixture) -> None:
        """Test safe types deserialize without warnings through encryption."""
        serde = _make_encrypted_serde()
@@ -35,8 +35,6 @@ from langgraph.checkpoint.serde.jsonplus import (
    JsonPlusSerializer,
    _msgpack_enc,
    _msgpack_ext_hook_to_json,
-    _warned_blocked_types,
-    _warned_unregistered_types,
 )
 from langgraph.store.base import Item

@@ -333,57 +331,6 @@ def test_serde_jsonplus_bytes() -> None:
    assert serde.loads_typed(dumped) == some_bytes


-def test_lc2_json_safe_type_revives_without_allowlist() -> None:
-    """Old 'json' blobs with lc=2 for safe types must revive without an explicit allowlist.
-
-    Regression test for: https://github.com/langchain-ai/langgraph/issues/7498
-    Threads checkpointed before v1.0.1 (pre-msgpack) stored messages as lc=2 JSON
-    constructor dicts. Resuming those threads must reconstruct proper BaseMessage objects
-    rather than returning raw dicts that cause MESSAGE_COERCION_FAILURE in add_messages.
-    """
-    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 = {
@@ -398,193 +345,6 @@ def test_deserde_invalid_module() -> None:
    serde.loads_typed(("json", json.dumps(load).encode("utf-8")))


-def test_lc2_json_method_field_is_ignored() -> None:
-    """The `method` field on lc=2 envelopes is ignored.
-
-    Regression test for GHSA-fjqc-hq36-qh5p: `_revive_lc2` previously resolved
-    `getattr(cls, method)` from the envelope, which let an attacker pivot a
-    safe pydantic class (e.g., AIMessage) to `parse_raw(..., allow_pickle=True)`
-    and reach `pickle.loads`. Revival now uses only the default constructor.
-
-    Verifies that an envelope carrying ``method="parse_raw"`` does not dispatch
-    to that method: the result is whatever ``AIMessage(*args, **kwargs)`` would
-    produce, which proves the default constructor ran instead of ``parse_raw``.
-    """
-    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()

@@ -820,14 +580,6 @@ def test_msgpack_safe_types_no_warning(caplog: pytest.LogCaptureFixture) -> None
        assert result is not None


-@pytest.fixture(autouse=True)
-def _reset_warned_types() -> None:
-    # Warning dedup state is process-global; reset per-test so each case sees
-    # a fresh slate and assertions about warning emission are stable.
-    _warned_unregistered_types.clear()
-    _warned_blocked_types.clear()
-
-
 def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) -> None:
    """Pydantic models not in allowlist should log warning but still deserialize."""
    current = _lg_msgpack.STRICT_MSGPACK_ENABLED
@@ -843,12 +595,6 @@ def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) ->
    assert "unregistered type" in caplog.text.lower()
    assert "allowed_msgpack_modules" in caplog.text
    assert result == obj
-
-    # Second deserialization of the same type should NOT produce another warning
-    caplog.clear()
-    result2 = serde.loads_typed(dumped)
-    assert "unregistered type" not in caplog.text.lower()
-    assert result2 == obj
    _lg_msgpack.STRICT_MSGPACK_ENABLED = current


@@ -893,6 +639,7 @@ def test_msgpack_allowlist_silences_warning(caplog: pytest.LogCaptureFixture) ->

 def test_msgpack_none_blocks_unregistered(caplog: pytest.LogCaptureFixture) -> None:
    """allowed_msgpack_modules=None should block unregistered types."""
+
    serde = JsonPlusSerializer(allowed_msgpack_modules=None)

    obj = MyPydantic(foo="test", bar=42, inner=InnerPydantic(hello="world"))
@@ -910,6 +657,7 @@ def test_msgpack_allowlist_blocks_non_listed(
    caplog: pytest.LogCaptureFixture,
 ) -> None:
    """Allowlists should block unregistered types even if msgpack is enabled."""
+
    serde = JsonPlusSerializer(
        allowed_msgpack_modules=[("tests.test_jsonplus", "MyPydantic")]
    )
@@ -1235,3 +983,31 @@ def test_msgpack_nested_pydantic_serializes_as_dict(
    # No blocking should occur - inner is serialized as dict, not ext
    assert "blocked" not in caplog.text.lower()
    assert result == obj
+
+
+def test_delta_value_serde_round_trip() -> None:
+    from langgraph.checkpoint.base import DeltaValue
+    from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+
+    serde = JsonPlusSerializer()
+    original = DeltaValue(
+        delta=[{"type": "human", "content": "hi"}], prev_checkpoint_id="abc-123"
+    )
+    type_tag, blob = serde.dumps_typed(original)
+    assert type_tag == "delta"
+    loaded = serde.loads_typed((type_tag, blob))
+    assert isinstance(loaded, DeltaValue)
+    assert loaded.delta == original.delta
+    assert loaded.prev_checkpoint_id == "abc-123"
+
+
+def test_delta_value_serde_chain_root() -> None:
+    from langgraph.checkpoint.base import DeltaValue
+    from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+
+    serde = JsonPlusSerializer()
+    original = DeltaValue(delta=[], prev_checkpoint_id=None)
+    type_tag, blob = serde.dumps_typed(original)
+    loaded = serde.loads_typed((type_tag, blob))
+    assert isinstance(loaded, DeltaValue)
+    assert loaded.prev_checkpoint_id is None
@@ -12,25 +12,13 @@ from langgraph.checkpoint.base import (
    empty_checkpoint,
 )
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.checkpoint.serde.jsonplus import (
-    JsonPlusSerializer,
-    _warned_blocked_types,
-    _warned_unregistered_types,
-)
+from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer


 class MemoryPydantic(BaseModel):
    foo: str


-@pytest.fixture(autouse=True)
-def _reset_warned_types() -> None:
-    # Warning dedup state is process-global; reset per-test so each case sees
-    # a fresh slate and assertions about warning emission are stable.
-    _warned_unregistered_types.clear()
-    _warned_blocked_types.clear()
-
-
 class TestMemorySaver:
    @pytest.fixture(autouse=True)
    def setup(self) -> None:
@@ -208,6 +196,8 @@ class TestMemorySaver:


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

@@ -321,360 +311,33 @@ def test_memory_saver_with_allowlist_proxy_isolated() -> None:


 class TestInMemorySaverDeltaChannel:
-    def test_load_blobs_omits_delta_channel(self) -> None:
-        """_load_blobs omits delta channels (stored as 'empty'); reconstruction deferred."""
-        saver = InMemorySaver()
+    def test_get_channel_blob(self) -> None:
+        """get_channel_blob returns the deserialized blob for a checkpoint+channel."""
+        from langgraph.checkpoint.base import DeltaValue, empty_checkpoint

-        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"
+        version = "00000000000000000000000000000001.0000000000000000"
+        delta = DeltaValue(delta=[{"content": "hi"}], prev_checkpoint_id=None)
+        saver.blobs[(thread_id, ns, channel, version)] = serde.dumps_typed(delta)

-        cp1 = empty_checkpoint()
-        cp1["id"] = "cp1"
-        cp2 = empty_checkpoint()
-        cp2["id"] = "cp2"
+        cp = empty_checkpoint()
+        cp["id"] = "cp1"
+        cp["channel_versions"][channel] = version
        saver.storage[thread_id][ns] = {
-            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
-            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+            "cp1": (serde.dumps_typed(cp), serde.dumps_typed({}), None)
        }
-        # 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"}]
+        result = saver.get_channel_blob(thread_id, ns, "cp1", channel)
+        assert isinstance(result, DeltaValue)
+        assert result.delta == [{"content": "hi"}]
+        assert result.prev_checkpoint_id is None

-    def test_get_channel_writes_at_root_returns_empty(self) -> None:
-        """Reconstructing the root checkpoint's state: no ancestors → []."""
+    def test_get_channel_blob_missing(self) -> None:
+        """get_channel_blob returns NotImplemented when checkpoint or channel not found."""
        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"}),
-            "",
+        assert (
+            saver.get_channel_blob("t1", "", "no-such-cp", "messages") is NotImplemented
        )
-
-        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
@@ -2,8 +2,7 @@ version = 1
 revision = 3
 requires-python = ">=3.10"
 resolution-markers = [
-    "python_full_version >= '3.15'",
-    "python_full_version >= '3.12' and python_full_version < '3.15'",
+    "python_full_version >= '3.12'",
    "python_full_version == '3.11.*'",
    "python_full_version < '3.11'",
 ]
@@ -229,11 +228,11 @@ wheels = [

 [[package]]
 name = "idna"
-version = "3.15"
+version = "3.11"
 source = { registry = "https://pypi.org/simple" }
-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" }
+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" }
 wheels = [
-    { 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" },
+    { 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" },
 ]

 [[package]]
@@ -268,11 +267,10 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.3.3"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
-    { name = "langchain-protocol" },
    { name = "langsmith" },
    { name = "packaging" },
    { name = "pydantic" },
@@ -281,26 +279,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-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" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/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" },
+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.1.1"
+version = "4.0.2"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
@@ -383,7 +369,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.8.0"
+version = "0.7.31"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -396,9 +382,9 @@ dependencies = [
    { name = "xxhash" },
    { name = "zstandard" },
 ]
-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" }
+sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
 ]

 [[package]]
@@ -500,7 +486,7 @@ wheels = [

 [[package]]
 name = "mypy"
-version = "1.20.2"
+version = "1.20.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "librt", marker = "platform_python_implementation != 'PyPy'" },
@@ -509,51 +495,51 @@ dependencies = [
    { name = "tomli", marker = "python_full_version < '3.11'" },
    { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/04/af/e3d4b3e9ec91a0ff9aabfdb38692952acf49bbb899c2e4c29acb3a6da3ae/mypy-1.20.2.tar.gz", hash = "sha256:e8222c26daaafd9e8626dec58ae36029f82585890589576f769a650dd20fd665", size = 3817349, upload-time = "2026-04-21T17:12:28.473Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/5c/b0089fe7fef0a994ae5ee07029ced0526082c6cfaaa4c10d40a10e33b097/mypy-1.20.0.tar.gz", hash = "sha256:eb96c84efcc33f0b5e0e04beacf00129dd963b67226b01c00b9dfc8affb464c3", size = 3815028, upload-time = "2026-03-31T16:55:14.959Z" }
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@@ -5,5 +5,5 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14"
+  "langchain-openai==1.0.1"
 ]
@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14",
+  "langchain-openai==1.0.0a2",
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 ]
@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.1.14",
+  "langchain-openai==1.0.0a2",
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 ]
@@ -21,25 +21,25 @@
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-    "@langchain/langgraph": "^1.2.9"
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+  resolved "https://registry.yarnpkg.com/@eslint/config-helpers/-/config-helpers-0.5.3.tgz#721fe6bbb90d74b0c80d6ff2428e5bbcb002becb"
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+"@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==
  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@^3.0.5":
-  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/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/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==
+"@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==
  dependencies:
-    "@eslint/core" "^1.2.1"
+    "@eslint/core" "^1.1.1"
    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@^1.1.42":
-  version "1.1.42"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.42.tgz#607bfd34c1414c9cbeb2859fda1b254a14c28085"
-  integrity sha512-d0tN96BrwPMryYyWR9VfyAntSivn7EQrZCe5Kpxum93tcjTXbKKmKvItFec8AluQt88iTcmAJrahUZUNfzGwTA==
+"@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==
  dependencies:
    "@cfworker/json-schema" "^4.0.2"
    "@standard-schema/spec" "^1.1.0"
@@ -904,6 +904,7 @@
    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":
@@ -913,23 +914,23 @@
  dependencies:
    uuid "^10.0.0"

-"@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==
+"@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==
  dependencies:
    "@types/json-schema" "^7.0.15"
    p-queue "^9.0.1"
    p-retry "^7.1.1"
    uuid "^13.0.0"

-"@langchain/langgraph@^1.2.9":
-  version "1.2.9"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.9.tgz#4f0ba159062c3649c83cf5f621ef926b96933e32"
-  integrity sha512-3c7BtGycHC2v9p6w/Hv8L7kEl1YnZYOQTDJtmAp3knk6JOedO7d2bYP3y0SRyhv5orUEGf/KGvx8ZsB/ideP7g==
+"@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==
  dependencies:
    "@langchain/langgraph-checkpoint" "^1.0.1"
-    "@langchain/langgraph-sdk" "~1.8.9"
+    "@langchain/langgraph-sdk" "~1.8.1"
    "@standard-schema/spec" "1.1.0"
    uuid "^10.0.0"

@@ -1097,100 +1098,100 @@
  dependencies:
    "@types/yargs-parser" "*"

-"@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==
+"@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==
  dependencies:
    "@eslint-community/regexpp" "^4.12.2"
-    "@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"
+    "@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"
    ignore "^7.0.5"
    natural-compare "^1.4.0"
    ts-api-utils "^2.5.0"

-"@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==
+"@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==
  dependencies:
-    "@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"
+    "@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"
    debug "^4.4.3"

-"@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==
+"@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==
  dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.59.1"
-    "@typescript-eslint/types" "^8.59.1"
+    "@typescript-eslint/tsconfig-utils" "^8.58.0"
+    "@typescript-eslint/types" "^8.58.0"
    debug "^4.4.3"

-"@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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/visitor-keys" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/visitor-keys" "8.58.0"

-"@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/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/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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/typescript-estree" "8.59.1"
-    "@typescript-eslint/utils" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/typescript-estree" "8.58.0"
+    "@typescript-eslint/utils" "8.58.0"
    debug "^4.4.3"
    ts-api-utils "^2.5.0"

-"@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/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/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==
+"@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==
  dependencies:
-    "@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"
+    "@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"
    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@8.59.1":
-  version "8.59.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.59.1.tgz#cf6204d69701bbbc5b150f98c18aeef0a42c10bd"
-  integrity sha512-3pIeoXhCeYH9FSCBI8P3iNwJlGuzPlYKkTlen2O9T1DSeeg8UG8jstq6BLk+Mda0qup7mgk4z4XL4OzRaxZ8LA==
+"@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==
  dependencies:
    "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.59.1"
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/scope-manager" "8.58.0"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/typescript-estree" "8.58.0"

-"@typescript-eslint/visitor-keys@8.59.1":
-  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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
    eslint-visitor-keys "^5.0.0"

 "@ungap/structured-clone@^1.3.0":
@@ -1908,10 +1909,10 @@ doctrine@^2.1.0:
  dependencies:
    esutils "^2.0.2"

-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==
+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==

 dunder-proto@^1.0.0, dunder-proto@^1.0.1:
  version "1.0.1"
@@ -2262,17 +2263,17 @@ 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@^10.2.1:
-  version "10.2.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.2.1.tgz#224b2a6caeb34473eddcf918762363e2e063222a"
-  integrity sha512-wiyGaKsDgqXvF40P8mDwiUp/KQjE1FdrIEJsM8PZ3XCiniTMXS3OHWWUe5FI5agoCnr8x4xPrTDZuxsBlNHl+Q==
+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==
  dependencies:
    "@eslint-community/eslint-utils" "^4.8.0"
    "@eslint-community/regexpp" "^4.12.2"
-    "@eslint/config-array" "^0.23.5"
-    "@eslint/config-helpers" "^0.5.5"
-    "@eslint/core" "^1.2.1"
-    "@eslint/plugin-kit" "^0.7.1"
+    "@eslint/config-array" "^0.23.3"
+    "@eslint/config-helpers" "^0.5.3"
+    "@eslint/core" "^1.1.1"
+    "@eslint/plugin-kit" "^0.6.1"
    "@humanfs/node" "^0.16.6"
    "@humanwhocodes/module-importer" "^1.0.1"
    "@humanwhocodes/retry" "^0.4.2"
@@ -2682,7 +2683,7 @@ 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@^4.7.9:
+handlebars@^4.7.8:
  version "4.7.9"
  resolved "https://registry.yarnpkg.com/handlebars/-/handlebars-4.7.9.tgz#6f139082ab58dc4e5a0e51efe7db5ae890d56a0f"
  integrity sha512-4E71E0rpOaQuJR2A3xDZ+GM1HyWYv1clR58tC8emQNeQe3RH7MAzSbat+V0wG78LQBo6m6bzSG/L4pBuCsgnUQ==
@@ -3675,11 +3676,12 @@ keyv@^4.5.4:
    json-buffer "3.0.1"

 "langsmith@>=0.5.0 <1.0.0":
-  version "0.6.3"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.6.3.tgz#a3d8ad58d66a47d3697e3c69b2be3f6df5233190"
-  integrity sha512-pXrQ4/4myQvjFFOAUmt5pWRrLEZR20gzIJD7MNdUH+5/S5nLI4ZRBo/SYKC6coaYj9pYTfQdBIzcs+3kfJ5uDA==
+  version "0.5.20"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
+  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
  dependencies:
    p-queue "6.6.2"
+    uuid "10.0.0"

 leven@^3.1.0:
  version "3.1.0"
@@ -4128,10 +4130,10 @@ prettier-linter-helpers@^1.0.1:
  dependencies:
    fast-diff "^1.1.2"

-prettier@^3.8.3:
-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.3.tgz#560f2de55bf01b4c0503bc629d5df99b9a1d09b0"
-  integrity sha512-7igPTM53cGHMW8xWuVTydi2KO233VFiTNyF5hLJqpilHfmn8C8gPf+PS7dUT64YcXFbiMGZxS9pCSxL/Dxm/Jw==
+prettier@^3.8.1:
+  version "3.8.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
+  integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==

 pretty-format@30.2.0, pretty-format@^30.0.0:
  version "30.2.0"
@@ -4285,7 +4287,7 @@ semver@^6.3.1:
  resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
  integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==

-semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3, semver@^7.7.4:
+semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3:
  version "7.7.4"
  resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.4.tgz#28464e36060e991fa7a11d0279d2d3f3b57a7e8a"
  integrity sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==
@@ -4621,18 +4623,18 @@ 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@^29.4.9:
-  version "29.4.9"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-29.4.9.tgz#47dc33d0f5c36bddcedd16afefae285e0b049d2d"
-  integrity sha512-LTb9496gYPMCqjeDLdPrKuXtncudeV1yRZnF4Wo5l3SFi0RYEnYRNgMrFIdg+FHvfzjCyQk1cLncWVqiSX+EvQ==
+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==
  dependencies:
    bs-logger "^0.2.6"
    fast-json-stable-stringify "^2.1.0"
-    handlebars "^4.7.9"
+    handlebars "^4.7.8"
    json5 "^2.2.3"
    lodash.memoize "^4.1.2"
    make-error "^1.3.6"
-    semver "^7.7.4"
+    semver "^7.7.3"
    type-fest "^4.41.0"
    yargs-parser "^21.1.1"

@@ -4847,11 +4849,16 @@ 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"
@@ -9,8 +9,8 @@
  },
  "dependencies": {
    "@js-monorepo-example/shared": "*",
-    "@langchain/core": "^1.1.42",
-    "@langchain/langgraph": "^1.2.9"
+    "@langchain/core": "^1.1.38",
+    "@langchain/langgraph": "^1.2.6"
  },
  "devDependencies": {
    "typescript": "^5.9.3"
@@ -17,18 +17,18 @@
    "lint": "eslint 'apps/**/*.ts' 'libs/**/*.ts'"
  },
  "devDependencies": {
-    "turbo": "^2.9.14",
+    "turbo": "^2.9.3",
    "typescript": "^5.9.3",
    "@tsconfig/recommended": "^1.0.13",
    "@eslint/eslintrc": "^3.3.5",
    "@eslint/js": "^10.0.1",
-    "eslint": "^10.2.1",
+    "eslint": "^10.1.0",
    "eslint-config-prettier": "^10.1.8",
    "eslint-plugin-import": "^2.27.5",
    "eslint-plugin-no-instanceof": "^1.0.1",
    "eslint-plugin-prettier": "^5.5.5",
-    "@typescript-eslint/eslint-plugin": "^8.59.1",
-    "@typescript-eslint/parser": "^8.59.1",
-    "prettier": "^3.8.3"
+    "@typescript-eslint/eslint-plugin": "^8.58.0",
+    "@typescript-eslint/parser": "^8.58.0",
+    "prettier": "^3.8.1"
  }
 }
@@ -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@^0.23.5":
-  version "0.23.5"
-  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.23.5.tgz#56e86d243049195d8acc0c06a1b3dfdc3fa3de95"
-  integrity sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==
+"@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==
  dependencies:
-    "@eslint/object-schema" "^3.0.5"
+    "@eslint/object-schema" "^3.0.3"
    debug "^4.3.1"
    minimatch "^10.2.4"

-"@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==
+"@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==
  dependencies:
-    "@eslint/core" "^1.2.1"
+    "@eslint/core" "^1.1.1"

-"@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==
+"@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==
  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@^3.0.5":
-  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/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/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==
+"@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==
  dependencies:
-    "@eslint/core" "^1.2.1"
+    "@eslint/core" "^1.1.1"
    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@^1.1.42":
-  version "1.1.42"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.1.42.tgz#607bfd34c1414c9cbeb2859fda1b254a14c28085"
-  integrity sha512-d0tN96BrwPMryYyWR9VfyAntSivn7EQrZCe5Kpxum93tcjTXbKKmKvItFec8AluQt88iTcmAJrahUZUNfzGwTA==
+"@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==
  dependencies:
    "@cfworker/json-schema" "^4.0.2"
    "@standard-schema/spec" "^1.1.0"
@@ -117,6 +117,7 @@
    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":
@@ -126,23 +127,23 @@
  dependencies:
    uuid "^10.0.0"

-"@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==
+"@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==
  dependencies:
    "@types/json-schema" "^7.0.15"
    p-queue "^9.0.1"
    p-retry "^7.1.1"
    uuid "^13.0.0"

-"@langchain/langgraph@^1.2.9":
-  version "1.2.9"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.2.9.tgz#4f0ba159062c3649c83cf5f621ef926b96933e32"
-  integrity sha512-3c7BtGycHC2v9p6w/Hv8L7kEl1YnZYOQTDJtmAp3knk6JOedO7d2bYP3y0SRyhv5orUEGf/KGvx8ZsB/ideP7g==
+"@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==
  dependencies:
    "@langchain/langgraph-checkpoint" "^1.0.1"
-    "@langchain/langgraph-sdk" "~1.8.9"
+    "@langchain/langgraph-sdk" "~1.8.1"
    "@standard-schema/spec" "1.1.0"
    uuid "^10.0.0"

@@ -166,35 +167,35 @@
  resolved "https://registry.yarnpkg.com/@tsconfig/recommended/-/recommended-1.0.13.tgz#269fce3ad04ca70b93269ff44cca81b950f542da"
  integrity sha512-sySRuBfMKyKO/j2ZAhR8kSembhjuPEV4Ra3AHtmWLq51+iGaudr45crPSzNC5b7/Ctrh9dfUpBuTlYrH6rM58Q==

-"@turbo/darwin-64@2.9.14":
-  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-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-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/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/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-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-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/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/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-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-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==
+"@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==

 "@types/esrecurse@^4.3.1":
  version "4.3.1"
@@ -216,100 +217,100 @@
  resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
  integrity sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==

-"@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==
+"@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==
  dependencies:
    "@eslint-community/regexpp" "^4.12.2"
-    "@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"
+    "@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"
    ignore "^7.0.5"
    natural-compare "^1.4.0"
    ts-api-utils "^2.5.0"

-"@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==
+"@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==
  dependencies:
-    "@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"
+    "@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"
    debug "^4.4.3"

-"@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==
+"@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==
  dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.59.1"
-    "@typescript-eslint/types" "^8.59.1"
+    "@typescript-eslint/tsconfig-utils" "^8.58.0"
+    "@typescript-eslint/types" "^8.58.0"
    debug "^4.4.3"

-"@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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/visitor-keys" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/visitor-keys" "8.58.0"

-"@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/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/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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/typescript-estree" "8.59.1"
-    "@typescript-eslint/utils" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/typescript-estree" "8.58.0"
+    "@typescript-eslint/utils" "8.58.0"
    debug "^4.4.3"
    ts-api-utils "^2.5.0"

-"@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/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/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==
+"@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==
  dependencies:
-    "@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"
+    "@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"
    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@8.59.1":
-  version "8.59.1"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.59.1.tgz#cf6204d69701bbbc5b150f98c18aeef0a42c10bd"
-  integrity sha512-3pIeoXhCeYH9FSCBI8P3iNwJlGuzPlYKkTlen2O9T1DSeeg8UG8jstq6BLk+Mda0qup7mgk4z4XL4OzRaxZ8LA==
+"@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==
  dependencies:
    "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.59.1"
-    "@typescript-eslint/types" "8.59.1"
-    "@typescript-eslint/typescript-estree" "8.59.1"
+    "@typescript-eslint/scope-manager" "8.58.0"
+    "@typescript-eslint/types" "8.58.0"
+    "@typescript-eslint/typescript-estree" "8.58.0"

-"@typescript-eslint/visitor-keys@8.59.1":
-  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==
+"@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==
  dependencies:
-    "@typescript-eslint/types" "8.59.1"
+    "@typescript-eslint/types" "8.58.0"
    eslint-visitor-keys "^5.0.0"

 acorn-jsx@^5.3.2:
@@ -786,17 +787,17 @@ 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@^10.2.1:
-  version "10.2.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.2.1.tgz#224b2a6caeb34473eddcf918762363e2e063222a"
-  integrity sha512-wiyGaKsDgqXvF40P8mDwiUp/KQjE1FdrIEJsM8PZ3XCiniTMXS3OHWWUe5FI5agoCnr8x4xPrTDZuxsBlNHl+Q==
+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==
  dependencies:
    "@eslint-community/eslint-utils" "^4.8.0"
    "@eslint-community/regexpp" "^4.12.2"
-    "@eslint/config-array" "^0.23.5"
-    "@eslint/config-helpers" "^0.5.5"
-    "@eslint/core" "^1.2.1"
-    "@eslint/plugin-kit" "^0.7.1"
+    "@eslint/config-array" "^0.23.3"
+    "@eslint/config-helpers" "^0.5.3"
+    "@eslint/core" "^1.1.1"
+    "@eslint/plugin-kit" "^0.6.1"
    "@humanfs/node" "^0.16.6"
    "@humanwhocodes/module-importer" "^1.0.1"
    "@humanwhocodes/retry" "^0.4.2"
@@ -1327,11 +1328,12 @@ keyv@^4.5.4:
    json-buffer "3.0.1"

 "langsmith@>=0.5.0 <1.0.0":
-  version "0.7.1"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.7.1.tgz#d721ad2e5211f9a5373e8a84eb4fed36b5621971"
-  integrity sha512-Wjk90UjNoY5cBHMlNAC/eZx5clI8jnjBOBW8uJu8+MWBtx0QesNjsUiLtjI+I3UnrpxFFpDqGXcnhBjH654Mqg==
+  version "0.5.20"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
+  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
  dependencies:
    p-queue "6.6.2"
+    uuid "10.0.0"

 levn@^0.4.1:
  version "0.4.1"
@@ -1557,10 +1559,10 @@ prettier-linter-helpers@^1.0.1:
  dependencies:
    fast-diff "^1.1.2"

-prettier@^3.8.3:
-  version "3.8.3"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.3.tgz#560f2de55bf01b4c0503bc629d5df99b9a1d09b0"
-  integrity sha512-7igPTM53cGHMW8xWuVTydi2KO233VFiTNyF5hLJqpilHfmn8C8gPf+PS7dUT64YcXFbiMGZxS9pCSxL/Dxm/Jw==
+prettier@^3.8.1:
+  version "3.8.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
+  integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==

 punycode@^2.1.0:
  version "2.3.1"
@@ -1813,17 +1815,17 @@ tsconfig-paths@^3.15.0:
    minimist "^1.2.6"
    strip-bom "^3.0.0"

-turbo@^2.9.14:
-  version "2.9.14"
-  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.9.14.tgz#d412fcc4c9bd8dba29cec5bbd54d5a74ab2b1bee"
-  integrity sha512-BQqXRr4UoWI3UPFrtznCLykYHxwxWh53iCB57x092jPMjIlW1wnm3N895g5irpiXmnxUhREBB0n6+y8BHhs4nw==
+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==
  optionalDependencies:
-    "@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"
+    "@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"

 type-check@^0.4.0, type-check@~0.4.0:
  version "0.4.0"
@@ -1899,11 +1901,16 @@ 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"
@@ -1 +1 @@
-__version__ = "0.4.27"
+__version__ = "0.4.22"
@@ -1,124 +0,0 @@
-"""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,
-    )
@@ -9,12 +9,35 @@ 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."""
@@ -35,12 +35,6 @@ 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:
@@ -129,18 +123,6 @@ 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):
@@ -194,12 +176,12 @@ def validate_config(config: Config) -> Config:
            )
    if api_version:
        try:
-            parts = _parse_api_version_parts(api_version)
+            parts = tuple(map(int, api_version.split("-")[0].split(".")))
            if len(parts) > 3:
                raise ValueError(
                    "Version must be major or major.minor or major.minor.patch."
                )
-        except (TypeError, ValueError):
+        except TypeError:
            raise click.UsageError(
                f"Invalid version format: {api_version}.\n\n"
                "Pin to a minor version, e.g.:\n"
@@ -1,141 +0,0 @@
-"""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]
@@ -20,7 +20,6 @@ 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
@@ -116,172 +115,6 @@ 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
 # ---------------------------------------------------------------------------
@@ -339,16 +172,15 @@ def find_deployment_id_by_name(
 # ---------------------------------------------------------------------------


-def normalize_name(value: str | None) -> str:
-    """Sanitize a deployment/directory name into a valid deployment name.
+def normalize_image_name(value: str | None) -> str:
+    """Sanitize a deployment/directory name into a valid Docker repository name.

-    LangSmith Deployment names only allow lowercase
-    alphanumeric characters and hyphens ([a-z0-9-]).
-    Invalid characters are replaced with hyphens.
+    Docker repository names must be lowercase and may only contain
+    [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"


@@ -475,8 +307,9 @@ def _resolve_env_path(
    if isinstance(env_field, str):
        env_path = (config_path.parent / env_field).resolve()
        if not env_path.exists():
-            _get_emitter().note(
-                f"Warning: env file '{env_field}' specified in langgraph.json not found."
+            click.secho(
+                f"Warning: env file '{env_field}' specified in langgraph.json not found.",
+                fg="yellow",
            )
            return None
        return env_path
@@ -510,7 +343,7 @@ def _secrets_from_env(
    secrets: list[dict[str, str]] = []
    for name, value in env_vars.items():
        if name in RESERVED_ENV_VARS:
-            _get_emitter().note(f"Skipping reserved env var: {name}")
+            click.secho(f"   Skipping reserved env var: {name}", fg="yellow")
            continue
        if not value:
            continue
@@ -553,8 +386,8 @@ def _resolve_build_mode(
 # ---------------------------------------------------------------------------


-def _log_deploy_step(step: int, message: str, **extra: object) -> None:
-    _get_emitter().step(step, message, **extra)
+def _log_deploy_step(step: int, message: str) -> None:
+    click.secho(f"{step}. {message}", fg="cyan")


 def _resolve_deployment(
@@ -578,13 +411,12 @@ 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)
-        em.info(f"Found existing deployment (ID: {deployment_id})")
+        click.secho(f"   Found existing deployment (ID: {deployment_id})", fg="green")
    else:
        needs_creation = True
-        em.warn(not_found_message)
+        click.secho(not_found_message, fg="yellow")
    return deployment_id, needs_creation, step + 1


@@ -612,7 +444,7 @@ def _create_deployment(
        raise HostBackendError(
            "POST /v2/deployments succeeded but response missing a valid 'id'"
        )
-    _get_emitter().info(f"Deployment ID: {created_id}", deployment_id=created_id)
+    click.secho(f"   Deployment ID: {created_id}", fg="green")
    return created_id, step + 1


@@ -626,36 +458,21 @@ 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("/")
-
-    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"
-
+    if hostname.startswith("eu."):
+        return "https://eu.smith.langchain.com"
    return "https://smith.langchain.com"


-def _get_deployment_status_url(
+def _print_deployment_status_url(
    updated: object, deployment_id: str, host_url: str | None = None
-) -> str | None:
-    """Compute the LangSmith dashboard URL for a deployment, if possible."""
+) -> None:
+    """Print the deployment status URL when tenant metadata is available."""
    tenant_id = updated.get("tenant_id") if isinstance(updated, dict) else None
    if not tenant_id:
-        return None
+        return
    base = _smith_dashboard_base_url(host_url)
-    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
+    status_url = f"{base}/o/{tenant_id}/host/deployments/{deployment_id}"
+    click.secho(f"   View status: {status_url}", fg="cyan")


 def _poll_revision_status(
@@ -669,7 +486,6 @@ 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 []
@@ -681,11 +497,7 @@ def _poll_revision_status(
    last_status = ""
    deadline = time.time() + timeout_seconds
    start_time = time.monotonic()
-    last_heartbeat = start_time
-    json_mode = em.json_mode
-    with Progress(
-        message=progress_message, elapsed=True, json_mode=json_mode
-    ) as set_progress:
+    with Progress(message=progress_message, elapsed=True) as set_progress:
        while time.time() < deadline:
            try:
                rev = client.get_revision(deployment_id, revision_id)
@@ -702,15 +514,14 @@ def _poll_revision_status(
            if status != last_status:
                set_progress("")
                if last_status:
-                    em.status_change(last_status, time.monotonic() - start_time)
+                    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})")
                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)
@@ -727,10 +538,8 @@ 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):
@@ -739,28 +548,24 @@ def _print_deployment_result(
            custom_url = sc.get("custom_url")

    if last_status == "DEPLOYED":
-        em.result(
-            "succeeded",
-            deployment_id=deployment_id,
-            url=custom_url,
-            status_url=status_url,
-        )
+        click.secho("   Deployment successful!", fg="green")
+        if custom_url:
+            click.secho(f"   URL: {custom_url}", fg="green")
    elif last_status in ("BUILD_FAILED", "DEPLOY_FAILED", "CREATE_FAILED"):
-        em.result(
-            "failed",
-            deployment_id=deployment_id,
-            status_url=status_url,
-        )
+        click.secho(f"   Deployment failed: {last_status}", fg="red")
        raise click.exceptions.Exit(1)
    else:
-        em.result(
-            "timed_out",
-            deployment_id=deployment_id,
-            status_url=status_url,
-            fallback_status_message=(
-                f"Check status in the LangSmith {dashboard_label}."
-            ),
+        click.secho(
+            f"   Timed out waiting for deployment (last status: {last_status}).",
+            fg="yellow",
        )
+        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",
+            )


 # ---------------------------------------------------------------------------
@@ -789,16 +594,14 @@ 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 reports upload progress via the emitter."""
+    """File-like wrapper that displays upload progress via click."""

-    def __init__(self, fobj, file_size: int, emitter: "_Emitter"):
+    def __init__(self, fobj, file_size: int):
        self._fobj = fobj
        self._file_size = file_size
-        self._emitter = emitter
        self._uploaded = 0

    def read(self, size=-1):
@@ -808,7 +611,10 @@ class _ProgressReader:
            pct = (
                int(self._uploaded * 100 / self._file_size) if self._file_size else 100
            )
-            self._emitter.upload_progress(self._file_size / _BYTES_PER_MIB, pct)
+            click.echo(
+                f"\r   Uploading ({self._file_size / 1_048_576:.1f} MB)... {pct}%",
+                nl=False,
+            )
        return data

    def __len__(self):
@@ -820,13 +626,10 @@ 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=reader,
+            data=_ProgressReader(f, file_size),
            method="PUT",
            headers={
                "Content-Type": "application/gzip",
@@ -841,8 +644,7 @@ 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
-    if not em.json_mode:
-        click.echo()
+    click.echo()


 # ---------------------------------------------------------------------------
@@ -850,41 +652,6 @@ 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,
@@ -903,7 +670,6 @@ 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
@@ -986,7 +752,7 @@ 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_name(repo_seed)
+        repo_name = normalize_image_name(repo_seed)
        tag_value = normalize_image_tag(tag)
        remote_image = f"{normalized_registry}/{repo_name}:{tag_value}"

@@ -1045,28 +811,17 @@ def _run_local_build(
                    break
                except click.exceptions.Exit:
                    if attempt < max_push_retries - 1:
-                        _get_emitter().warn(
-                            f"   Push failed, retrying (attempt {attempt + 2} of {max_push_retries})..."
+                        click.secho(
+                            f"   Push failed, retrying (attempt {attempt + 2} of {max_push_retries})...",
+                            fg="yellow",
                        )
                    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,
-            resolved_image,
-            secrets=secrets,
-            tracked_packages=tracked_packages,
-        )
+        updated = client.update_deployment(deployment_id, remote_image, secrets=secrets)

    return BuildResult(
        updated=updated if isinstance(updated, dict) else {},
@@ -1088,15 +843,13 @@ 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):
-        em.info(f"Archive created ({file_size / _BYTES_PER_MIB:.1f} MB)")
+        click.secho(f"   Archive created ({file_size / 1_048_576:.1f} MB)", fg="green")
        step += 1

        _log_deploy_step(step, "Requesting upload URL")
@@ -1119,7 +872,6 @@ def _run_remote_build(
        secrets=secrets,
        install_command=install_command,
        build_command=build_command,
-        tracked_packages=tracked_packages,
    )

    log_offset: str | None = None
@@ -1145,12 +897,12 @@ def _run_remote_build(
                if has_output:
                    set_progress("")
                    if not logs_header_printed:
-                        em.info(f"{status} (build logs):")
+                        click.echo(f"   {status} (build logs):")
                        logs_header_printed = True
                for entry in entries:
                    msg = entry.get("message", "")
                    if msg:
-                        em.log(msg)
+                        click.echo(f"   | {msg}")
                log_offset = logs_resp.get("next_offset") or log_offset
                if has_output:
                    set_progress(f"{status}...")
@@ -1158,10 +910,11 @@ def _run_remote_build(
            pass

    def _handle_interrupt(revision_id: str) -> None:
-        em.warn(
-            f"\nInterrupted. Deployment ID: {deployment_id}, Revision ID: {revision_id}"
+        click.secho(
+            f"\n   Interrupted. Deployment ID: {deployment_id}, Revision ID: {revision_id}",
+            fg="yellow",
        )
-        em.warn("The build will continue remotely.")
+        click.secho("   The build will continue remotely.", fg="yellow")

    return BuildResult(
        updated=updated if isinstance(updated, dict) else {},
@@ -1199,20 +952,12 @@ 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)
-    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)
+    return HostBackendClient(host_url, resolved_api_key)


 def _call_host_backend_with_optional_tenant(
@@ -1237,12 +982,6 @@ 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",
@@ -1450,19 +1189,6 @@ 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
@@ -1530,50 +1256,36 @@ def _deploy_cmd(
    no_wait: bool,
    remote_build_flag: bool | None,
    docker_build_args: Sequence[str],
-    json_output: bool,
-    no_input: bool,
 ):
-    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.secho(
+        "Note: 'langgraph deploy' is in beta. Expect frequent updates and improvements.",
+        fg="yellow",
    )
-    if not json_output:
-        click.echo()
+    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, emit=em.note)
+    warn_non_wolfi_distro(config_json)

    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_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}")
+        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}")

    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:
-        em.note(f"{local_build_error}\nUsing remote build instead.")
-        if not json_output:
-            click.echo()
+        click.secho(f"{local_build_error}\nUsing remote build instead.", fg="yellow")
+        click.echo()

    # -- 2. Resolve / create deployment --
    client = _create_host_backend_client(host_url, api_key, env_vars=env_vars)
@@ -1585,9 +1297,9 @@ 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."
        ),
    )

@@ -1604,15 +1316,6 @@ 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(
@@ -1625,7 +1328,6 @@ def _deploy_cmd(
            install_command=install_command,
            build_command=build_command,
            secrets=secrets,
-            tracked_packages=tracked_packages,
        )
    else:
        build_result = _run_local_build(
@@ -1645,18 +1347,13 @@ def _deploy_cmd(
            build_command=build_command,
            docker_build_args=docker_build_args,
            secrets=secrets,
-            tracked_packages=tracked_packages,
        )

    # -- 4. Shared wait + result --
-    dep_status_url = _emit_deployment_status_url(
-        build_result.updated,
-        deployment_id,
-        host_url,
-    )
+    _print_deployment_status_url(build_result.updated, deployment_id, host_url)

    if no_wait:
-        em.info(build_result.no_result_message)
+        click.secho(f"   {build_result.no_result_message}", fg="green")
        return

    last_status, revision_id = _poll_revision_status(
@@ -1669,7 +1366,7 @@ def _deploy_cmd(
        on_interrupt=build_result.on_interrupt,
    )
    if not last_status:
-        em.info(build_result.no_result_message)
+        click.secho(f"   {build_result.no_result_message}", fg="green")
        return

    if (
@@ -1678,7 +1375,7 @@ def _deploy_cmd(
        and not verbose
        and revision_id is not None
    ):
-        em.error("Last build log lines:")
+        click.secho("   Last build log lines:", fg="red")
        try:
            logs_resp = client.get_build_logs(
                deployment_id,
@@ -1690,17 +1387,19 @@ def _deploy_cmd(
                for entry in entries:
                    msg = entry.get("message", "")
                    if msg:
-                        em.log(msg)
+                        click.echo(f"   | {msg}")
        except Exception:
-            em.error("(failed to fetch build logs)")
-        em.warn("Re-run with --verbose to see full build output.")
+            click.secho("   (failed to fetch build logs)", fg="red")
+        click.secho(
+            "   Re-run with --verbose to see full build output.",
+            fg="yellow",
+        )

    _print_deployment_result(
        client,
        deployment_id,
        last_status,
        dashboard_label="Deployment dashboard",
-        status_url=dep_status_url,
    )


@@ -122,14 +122,11 @@ 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(
@@ -146,7 +143,6 @@ 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] = {
@@ -156,8 +152,6 @@ 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:
@@ -12,11 +12,10 @@ class Progress:
        while True:
            yield from "|/-\\"

-    def __init__(self, *, message="", elapsed: bool = False, json_mode: bool = False):
+    def __init__(self, *, message="", elapsed: 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
@@ -70,9 +69,6 @@ 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()
@@ -94,8 +90,6 @@ 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()
@@ -1,7 +1,5 @@
 """General-purpose utilities shared across the LangGraph CLI."""

-from collections.abc import Callable
-
 import click


@@ -9,42 +7,21 @@ def clean_empty_lines(input_str: str):
    return "\n".join(filter(None, input_str.splitlines()))


-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.
-    """
+def warn_non_wolfi_distro(config_json: dict) -> None:
+    """Show warning if image_distro is not set to 'wolfi'."""
    image_distro = config_json.get("image_distro", "debian")  # Default is debian
-    if image_distro == "wolfi":
-        return
-    if emit is not None:
-        emit(
-            "⚠️  Security Recommendation: Consider switching to Wolfi Linux for enhanced security."
+    if image_distro != "wolfi":
+        click.secho(
+            "⚠️  Security Recommendation: Consider switching to Wolfi Linux for enhanced security.",
+            fg="yellow",
+            bold=True,
        )
-        emit(
-            "   Wolfi is a security-oriented, minimal Linux distribution designed for containers."
+        click.secho(
+            "   Wolfi is a security-oriented, minimal Linux distribution designed for containers.",
+            fg="yellow",
        )
-        emit(
-            '   To switch, add \'"image_distro": "wolfi"\' to your langgraph.json config file.'
+        click.secho(
+            '   To switch, add \'"image_distro": "wolfi"\' to your langgraph.json config file.',
+            fg="yellow",
        )
-        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
+        click.secho("")  # Empty line for better readability
@@ -10,13 +10,7 @@ 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


@@ -446,32 +440,16 @@ def _container_root_for_uv_lock_package(


 def _uv_lock_package_copy_items(
-    package: UvLockPackage,
-    plan: UvLockPlan,
-    ignore_spec: pathspec.PathSpec,
+    package: UvLockPackage, plan: UvLockPlan
 ) -> 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,
@@ -483,32 +461,18 @@ 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))
            )
@@ -992,13 +956,10 @@ 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, ignore_spec
-        ):
+        for source, destination in _uv_lock_package_copy_items(package, plan):
            docker_plan.add_raw(copy_from_project_root(source, destination.as_posix()))
        docker_plan.add_instruction(
            "WORKDIR", plan.container_roots[package.root].as_posix()
@@ -23,13 +23,13 @@ dependencies = [
 path = "langgraph_cli/__init__.py"
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.5.35,<0.10.0 ; python_version >= '3.11'",
+    "langgraph-api>=0.5.35,<0.8.0 ; 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_oss"
+Twitter = "https://x.com/LangChain"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"

@@ -99,13 +99,6 @@ 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__/")
@@ -4,7 +4,6 @@ import os
 import pathlib
 import tempfile
 import textwrap
-from unittest.mock import patch

 import click
 import pytest
@@ -1856,364 +1855,6 @@ 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)
@@ -2944,23 +2585,6 @@ 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."""

@@ -1,134 +0,0 @@
-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"]
@@ -1,9 +1,6 @@
 import base64
-import io
 import json
 import os
-import sys
-from unittest.mock import MagicMock

 import click
 import httpx
@@ -11,16 +8,12 @@ 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,
-    _resolve_pushed_image_digest,
-    _smith_dashboard_base_url,
+    normalize_image_name,
    normalize_image_tag,
-    normalize_name,
 )
 from langgraph_cli.host_backend import HostBackendClient, HostBackendError

@@ -47,33 +40,30 @@ class TestDockerConfigForToken:
            assert "gcr.io" in data["auths"]


-class TestNormalizeName:
+class TestNormalizeImageName:
    def test_simple_name(self):
-        assert normalize_name("myapp") == "myapp"
+        assert normalize_image_name("myapp") == "myapp"

    def test_uppercase_lowered(self):
-        assert normalize_name("MyApp") == "myapp"
+        assert normalize_image_name("MyApp") == "myapp"

    def test_special_chars_replaced(self):
-        assert normalize_name("my app!@#v2") == "my-app-v2"
+        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_dots_and_hyphens_kept(self):
+        assert normalize_image_name("my-app.v2") == "my-app.v2"

    def test_leading_trailing_stripped(self):
-        assert normalize_name("--my-app..") == "my-app"
+        assert normalize_image_name("--my-app..") == "my-app"

    def test_empty_string_returns_app(self):
-        assert normalize_name("") == "app"
+        assert normalize_image_name("") == "app"

    def test_none_returns_app(self):
-        assert normalize_name(None) == "app"
+        assert normalize_image_name(None) == "app"

    def test_all_invalid_chars_returns_app(self):
-        assert normalize_name("!!!") == "app"
+        assert normalize_image_name("!!!") == "app"


 class TestNormalizeImageTag:
@@ -281,409 +271,3 @@ 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()
@@ -1,5 +1,3 @@
-import json
-
 import httpx
 import pytest

@@ -178,69 +176,6 @@ 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}
@@ -7,7 +7,6 @@ dependencies = [
    "langgraph>=0.6.0,<2",
    "langchain-core>=0.2.14",
    "shared",
-    "langgraph-checkpoint-postgres>=3.0.0"
 ]

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

 [tool.uv.workspace]
@@ -16,7 +16,6 @@ source = { editable = "apps/agent" }
 dependencies = [
    { name = "langchain-core" },
    { name = "langgraph" },
-    { name = "langgraph-checkpoint-postgres" },
    { name = "shared" },
 ]

@@ -24,7 +23,6 @@ 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" },
 ]

@@ -217,11 +215,10 @@ wheels = [

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-version = "1.3.3"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
-    { name = "langchain-protocol" },
    { name = "langsmith" },
    { name = "packaging" },
    { name = "pydantic" },
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-dependencies = [
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 name = "langgraph-prebuilt"
 version = "1.0.9"
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+version = "0.7.31"
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 [[package]]
@@ -771,14 +707,12 @@ source = { virtual = "." }
 dependencies = [
    { name = "langchain-core" },
    { name = "langgraph" },
-    { name = "langgraph-checkpoint-postgres" },
 ]

 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=1.3.3" },
+    { name = "langchain-core", specifier = ">=0.2.14" },
    { name = "langgraph", specifier = ">=0.6.0,<2" },
-    { name = "langgraph-checkpoint-postgres", specifier = ">=3.0.0" },
 ]

 [[package]]
@@ -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>=1.3.3",
+    "langchain-core>=0.2.14",
 ]

 [build-system]
@@ -26,11 +26,11 @@ wheels = [

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 ]

 [[package]]
@@ -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_oss" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
+  <a href="https://x.com/langchain" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
 </div>

 <br>
@@ -29,9 +29,6 @@ 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:
@@ -79,34 +76,6 @@ 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.

@@ -141,9 +110,34 @@ def merge_configs(*configs: RunnableConfig | None) -> RunnableConfig:
                else:
                    base[key] = value
            elif key == "callbacks":
-                base["callbacks"] = _merge_callbacks(
-                    base.get("callbacks"), cast(Callbacks, value)
-                )
+                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
            elif key == "recursion_limit":
                if config["recursion_limit"] != DEFAULT_RECURSION_LIMIT:
                    base["recursion_limit"] = config["recursion_limit"]
@@ -312,40 +306,7 @@ 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:
-                    # 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))
-                    )
+                    empty[k] = cast(dict, v).copy()
                else:
                    empty[k] = v  # type: ignore[literal-required]
        for k, v in config.items():
@@ -402,17 +363,3 @@ _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
@@ -12,9 +12,6 @@ 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")
@@ -59,8 +56,6 @@ 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")
@@ -71,13 +66,6 @@ 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")
@@ -105,7 +93,6 @@ RESERVED = {
    INTERRUPT,
    RESUME,
    ERROR,
-    ERROR_SOURCE_NODE,
    NO_WRITES,
    # reserved config.configurable keys
    CONFIG_KEY_SEND,
@@ -119,9 +106,7 @@ 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,
@@ -51,11 +51,9 @@ 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:
@@ -119,19 +117,6 @@ 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."""
@@ -196,15 +181,6 @@ 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.
@@ -378,8 +354,6 @@ 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
@@ -452,8 +426,6 @@ 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
@@ -1,25 +0,0 @@
-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.")
@@ -245,6 +245,15 @@ 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,
        *,
@@ -312,6 +321,15 @@ 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,
        *,
@@ -2,7 +2,7 @@ from __future__ import annotations

 from abc import ABC, abstractmethod
 from collections.abc import Sequence
-from typing import Any, Generic, TypeVar
+from typing import Any, Generic, Literal, TypeVar

 from typing_extensions import Self

@@ -119,3 +119,17 @@ class BaseChannel(Generic[Value, Update, Checkpoint], ABC):
        Returns `True` if the channel was updated, `False` otherwise.
        """
        return False
+
+    def after_checkpoint(self, version: Any, checkpoint_id: str | None = None) -> None:
+        """Called after checkpoint() with the assigned version, and after
+        from_checkpoint() with the current channel version.
+
+        No-op by default. Override in channels that track their own version
+        for incremental checkpointing (e.g. DeltaChannel).
+        """
+        pass
+
+    @property
+    def checkpoint_hydration_kind(self) -> Literal["delta"] | None:
+        """Return the saver hydration kind for this channel, if any."""
+        return None
@@ -22,9 +22,10 @@ __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


@@ -32,22 +33,11 @@ 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 len(value) == 1 and OVERWRITE in value:
+    if isinstance(value, dict) and set(value.keys()) == {OVERWRITE}:
        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.

@@ -78,8 +68,11 @@ class BinaryOperatorAggregate(Generic[Value], BaseChannel[Value, Value, Value]):
            self.value = MISSING

    def __eq__(self, value: object) -> bool:
-        return isinstance(value, BinaryOperatorAggregate) and _operators_equal(
-            self.operator, value.operator
+        return isinstance(value, BinaryOperatorAggregate) and (
+            value.operator is self.operator
+            if value.operator.__name__ != "<lambda>"
+            and self.operator.__name__ != "<lambda>"
+            else True
        )

    @property
@@ -1,190 +1,197 @@
 from __future__ import annotations

 import collections.abc
-import copy as _copy
 from collections.abc import Callable, Sequence
-from typing import Any, Generic
+from copy import copy
+from typing import Any, Generic, Literal

-from langgraph.checkpoint.base import PendingWrite
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from langgraph.checkpoint.base import DeltaChainValue, DeltaValue
 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,
-)
+from langgraph.channels.binop import _get_overwrite, _strip_extras
+from langgraph.errors import EmptyChannelError

 __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.
+def _copy_value(value: Any) -> Any:
+    if value is MISSING:
+        return value
+    try:
+        return value.copy()
+    except AttributeError:
+        return copy(value)

-    !!! 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.
+class DeltaChannel(Generic[Value], BaseChannel[list[Value], Value, DeltaValue]):
+    """A channel that stores only per-step write deltas in checkpoints.

-    The reducer receives the current accumulated value and a batch of writes
-    in one call: `reducer(state, [write1, write2, ...]) -> new_state`.
+    Reconstructs the full accumulated list at load time by replaying the
+    chain of deltas through the operator. Use with append-style reducers
+    (e.g. `add_messages`) on long-running threads to reduce checkpoint
+    storage from O(N²) to O(N).

-    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:
+    Works with all checkpointers. Savers with a dedicated blob store
+    (InMemorySaver, PostgresSaver) use an O(1) fast-path per chain step;
+    all others (SQLite, MongoDB, etc.) fall back to get_tuple traversal.

-        reducer(reducer(state, xs), ys) == reducer(state, xs + ys)
+    Use `snapshot_every=N` to cap chain traversal depth at N steps. Every N
+    steps a full snapshot is written as the chain root; subsequent deltas
+    chain back to it, so `get_state` / reload never traverses more than N
+    checkpoints regardless of thread length. Recommended for savers without
+    a dedicated blob store.

-    This lets LangGraph replay checkpointed writes in larger batches than they
-    were originally produced without changing reconstructed state.
+    Usage::

-    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.
+        class State(TypedDict):
+            messages: Annotated[list[AnyMessage], DeltaChannel(add_messages)]
+            # Cap reconstruction depth (recommended for SQLite / MongoDB savers):
+            messages: Annotated[list[AnyMessage], DeltaChannel(add_messages, snapshot_every=50)]
    """

-    __slots__ = ("value", "reducer", "snapshot_frequency")
-    value: Value | Any
+    __slots__ = (
+        "value",
+        "operator",
+        "snapshot_every",
+        "_pending",
+        "_base_version",
+        "_last_checkpoint_id",
+        "_overwritten",
+        "_steps_since_snapshot",
+    )

    def __init__(
        self,
-        reducer: Callable[[Any, Sequence[Any]], Any],
-        typ: type[Value] | None = None,
+        operator: Callable[[list[Value], Any], list[Value]],
+        typ: type = list,
        *,
-        snapshot_frequency: int = 1000,
+        snapshot_every: int | None = None,
    ) -> 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):
+        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
+        super().__init__(typ)
+        self.operator = operator
+        self.snapshot_every = snapshot_every
+        try:
+            self.value: list[Value] = typ()
+        except Exception:
+            self.value = []
+        self._pending: list[Any] = []
+        self._base_version: str | None = None
+        self._last_checkpoint_id: str | None = None
+        self._overwritten: bool = False
+        self._steps_since_snapshot: int = 0

    def __eq__(self, other: object) -> bool:
        if not isinstance(other, DeltaChannel):
            return False
-        if self.snapshot_frequency != other.snapshot_frequency:
+        if self.snapshot_every != other.snapshot_every:
            return False
-        return _operators_equal(self.reducer, other.reducer)
+        if (
+            self.operator.__name__ != "<lambda>"
+            and other.operator.__name__ != "<lambda>"
+        ):
+            return self.operator is other.operator
+        return True

    @property
    def ValueType(self) -> Any:
-        return self.typ
+        return list[self.typ]  # type: ignore[name-defined]

    @property
    def UpdateType(self) -> Any:
-        return self.typ
+        return self.typ | list[self.typ]  # type: ignore[name-defined]
+
+    @property
+    def checkpoint_hydration_kind(self) -> Literal["delta"]:
+        return "delta"

    def copy(self) -> Self:
-        new = self.__class__(
-            self.reducer, self.typ, snapshot_frequency=self.snapshot_frequency
-        )
+        new = DeltaChannel(self.operator, self.typ, snapshot_every=self.snapshot_every)
        new.key = self.key
-        new.value = self.value if self.value is MISSING else _copy.copy(self.value)
+        new.value = _copy_value(self.value)
+        new._pending = self._pending[:]
+        new._base_version = self._base_version
+        new._last_checkpoint_id = self._last_checkpoint_id
+        new._overwritten = self._overwritten
+        new._steps_since_snapshot = self._steps_since_snapshot
        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 = DeltaChannel(self.operator, self.typ, snapshot_every=self.snapshot_every)
        new.key = self.key
        if checkpoint is MISSING:
-            new.value = self.typ()
-        elif isinstance(checkpoint, _DeltaSnapshot):
-            new.value = checkpoint.value
+            pass
+        elif isinstance(checkpoint, DeltaChainValue):
+            accumulated: list[Value] = (
+                checkpoint.base if checkpoint.base is not None else new.typ()
+            )
+            for step_writes in checkpoint.deltas:
+                for write in step_writes:
+                    accumulated = new.operator(accumulated, write)
+            new.value = accumulated
+            # Seed the counter from actual chain depth so rehydration fires at
+            # the right time regardless of how many prior invocations there were.
+            new._steps_since_snapshot = len(checkpoint.deltas)
+        elif isinstance(checkpoint, DeltaValue):
+            # Should never reach here — checkpoint hydration should assemble
+            # DeltaValues into DeltaChainValue before calling from_checkpoint.
+            raise AssertionError(
+                "DeltaChannel.from_checkpoint received a raw DeltaValue. "
+                "This is a bug in checkpoint hydration — chain assembly should "
+                "have occurred before from_checkpoint was called."
+            )
        else:
-            new.value = checkpoint
+            # Backwards compat: plain value from old BinaryOperatorAggregate checkpoint
+            # or a full snapshot emitted by DeltaChannel.
+            new.value = _copy_value(checkpoint)
+        new._pending = []
+        new._base_version = None  # set by the subsequent after_checkpoint() call
+        new._overwritten = False
        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:
+        seen_overwrite = False
+        for value in values:
+            is_overwrite, overwrite_value = _get_overwrite(value)
+            if is_overwrite:
+                if seen_overwrite:
+                    from langgraph.errors import (
+                        ErrorCode,
+                        InvalidUpdateError,
+                        create_error_message,
+                    )
+
                    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))
+                self.value = (
+                    _copy_value(overwrite_value)
+                    if overwrite_value is not None
+                    else self.typ()
+                )
+                self._pending = (
+                    [] if overwrite_value is None else [_copy_value(self.value)]
+                )
+                self._overwritten = True
+                seen_overwrite = True
+            elif not seen_overwrite:
+                base = self.typ() if self.value is MISSING else self.value
+                self.value = self.operator(base, value)
+                self._pending.append(value)
        return True

-    def get(self) -> Any:
+    def get(self) -> list[Value]:
        if self.value is MISSING:
            raise EmptyChannelError()
        return self.value
@@ -193,12 +200,29 @@ class DeltaChannel(Generic[Value], BaseChannel[Any, Any, Any]):
        return self.value is not MISSING

    def checkpoint(self) -> Any:
-        """Return stored representation: always `MISSING`.
+        if (
+            self.snapshot_every is not None
+            and self._steps_since_snapshot >= self.snapshot_every
+        ):
+            # Emit a full snapshot to cap chain depth at snapshot_every.
+            # The saver stores this as a plain (non-diff) blob, so future
+            # deltas will chain back to it and traversal depth resets to 1.
+            return _copy_value(self.value)
+        return DeltaValue(
+            delta=self._pending[:],
+            prev_checkpoint_id=None if self._overwritten else self._last_checkpoint_id,
+        )

-        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
+    def after_checkpoint(self, version: Any, checkpoint_id: str | None = None) -> None:
+        if version != self._base_version:
+            if self._base_version is None:
+                pass  # First call after from_checkpoint — anchor without counting a step.
+            elif self.snapshot_every is not None:
+                if self._steps_since_snapshot >= self.snapshot_every:
+                    self._steps_since_snapshot = 0
+                else:
+                    self._steps_since_snapshot += 1
+            self._base_version = version
+            self._last_checkpoint_id = checkpoint_id
+            self._pending = []
+            self._overwritten = False
@@ -1,9 +1,8 @@
 from __future__ import annotations

 from collections.abc import Sequence
-from dataclasses import dataclass
 from enum import Enum
-from typing import Any, Literal
+from typing import Any
 from warnings import warn

 # EmptyChannelError is re-exported from langgraph.channels.base
@@ -16,15 +15,11 @@ from langgraph.warnings import LangGraphDeprecatedSinceV10
 __all__ = (
    "EmptyChannelError",
    "ErrorCode",
-    "GraphDrained",
    "GraphRecursionError",
    "InvalidUpdateError",
    "GraphBubbleUp",
    "GraphInterrupt",
-    "NodeCancelledError",
-    "NodeError",
    "NodeInterrupt",
-    "NodeTimeoutError",
    "ParentCommand",
    "EmptyInputError",
    "TaskNotFound",
@@ -47,23 +42,6 @@ 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.

@@ -99,6 +77,10 @@ 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."""
@@ -143,99 +125,3 @@ 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
@@ -5,7 +5,6 @@ import inspect
 import warnings
 from collections.abc import Awaitable, Callable, Sequence
 from dataclasses import dataclass
-from datetime import timedelta
 from typing import (
    Any,
    Generic,
@@ -23,11 +22,6 @@ 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
@@ -37,19 +31,13 @@ from langgraph.pregel._call import (
    P,
    SyncAsyncFuture,
    T,
-    _call_with_options,
+    call,
    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,
-    TimeoutPolicy,
-)
+from langgraph.types import _DC_KWARGS, CachePolicy, RetryPolicy, StreamMode
 from langgraph.typing import ContextT
 from langgraph.warnings import LangGraphDeprecatedSinceV05, LangGraphDeprecatedSinceV10

@@ -63,7 +51,6 @@ 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:
@@ -80,17 +67,15 @@ 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_with_options(
+        return call(
            self.func,
-            args,
-            kwargs,
            retry_policy=self.retry_policy,
            cache_policy=self.cache_policy,
-            timeout=self.timeout,
+            *args,
+            **kwargs,
        )

    def clear_cache(self, cache: BaseCache) -> None:
@@ -113,7 +98,6 @@ 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]],
@@ -135,7 +119,6 @@ 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]]
@@ -159,14 +142,6 @@ 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.
@@ -221,7 +196,6 @@ def task(
        )
        if retry_policy is None:
            retry_policy = retry  # type: ignore[assignment]
-    timeout_policy = coerce_timeout_policy(timeout)

    retry_policies: Sequence[RetryPolicy] = (
        ()
@@ -234,15 +208,8 @@ 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,
-            timeout=timeout_policy,
-            name=name,
+            func, retry_policy=retry_policies, cache_policy=cache_policy, name=name
        )

    if __func_or_none__ is not None:
@@ -301,15 +268,6 @@ 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.
@@ -442,7 +400,6 @@ 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."""
@@ -469,7 +426,6 @@ 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)
@@ -579,7 +535,6 @@ class entrypoint(Generic[ContextT]):
                    bound=bound,
                    triggers=[START],
                    channels=START,
-                    timeout=self.timeout,
                    writers=[
                        ChannelWrite(
                            [
@@ -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, TimeoutPolicy
+from langgraph.types import CachePolicy, RetryPolicy, StreamWriter
 from langgraph.typing import ContextT, NodeInputT, NodeInputT_contra


@@ -88,8 +88,5 @@ 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
@@ -244,71 +244,6 @@ 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,
@@ -6,8 +6,7 @@ import typing
 import warnings
 from collections import defaultdict
 from collections.abc import Awaitable, Callable, Hashable, Sequence
-from dataclasses import dataclass, is_dataclass
-from datetime import timedelta
+from dataclasses import is_dataclass
 from functools import partial
 from inspect import isclass, isfunction, ismethod, signature
 from types import FunctionType
@@ -46,11 +45,9 @@ 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 (
@@ -84,7 +81,6 @@ from langgraph.types import (
    Command,
    RetryPolicy,
    Send,
-    TimeoutPolicy,
    ensure_valid_checkpointer,
 )
 from langgraph.typing import ContextT, InputT, NodeInputT, OutputT, StateT
@@ -95,17 +91,6 @@ __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:
@@ -262,77 +247,10 @@ 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 | {
@@ -381,9 +299,7 @@ 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.
@@ -450,9 +366,7 @@ 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.
@@ -524,9 +438,7 @@ 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.
@@ -593,9 +505,7 @@ 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.
@@ -669,9 +579,7 @@ 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`.
@@ -690,7 +598,6 @@ 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.
@@ -702,14 +609,6 @@ 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
@@ -763,7 +662,6 @@ 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
@@ -850,25 +748,6 @@ 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]
@@ -876,10 +755,8 @@ 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(
@@ -888,10 +765,8 @@ 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](
@@ -900,10 +775,8 @@ 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
@@ -1158,6 +1031,7 @@ 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

@@ -1171,7 +1045,6 @@ 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.

@@ -1204,19 +1077,11 @@ 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]] = [
@@ -1271,64 +1136,6 @@ 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,
@@ -1351,9 +1158,7 @@ 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

@@ -1526,10 +1331,7 @@ 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
@@ -1865,20 +1667,6 @@ 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]
@@ -39,7 +39,6 @@ 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,
@@ -48,7 +47,6 @@ from langgraph._internal._constants import (
    CONFIG_KEY_TASK_ID,
    CONFIG_KEY_THREAD_ID,
    ERROR,
-    ERROR_SOURCE_NODE,
    INTERRUPT,
    NO_WRITES,
    NS_END,
@@ -68,7 +66,6 @@ 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
@@ -83,7 +80,6 @@ from langgraph.types import (
    PregelTask,
    RetryPolicy,
    Send,
-    TimeoutPolicy,
 )

 GetNextVersion = Callable[[V | None, None], V]
@@ -118,21 +114,13 @@ class PregelTaskWrites(NamedTuple):


 class Call:
-    __slots__ = (
-        "func",
-        "input",
-        "retry_policy",
-        "cache_policy",
-        "callbacks",
-        "timeout",
-    )
+    __slots__ = ("func", "input", "retry_policy", "cache_policy", "callbacks")

    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,
@@ -142,14 +130,12 @@ 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(
@@ -295,15 +281,7 @@ 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,
-                ERROR_SOURCE_NODE,
-            ):
+            if chan in (NO_WRITES, PUSH, RESUME, INTERRUPT, RETURN, ERROR):
                pass
            elif chan in channels:
                pending_writes_by_channel[chan].append(val)
@@ -755,48 +733,11 @@ 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)
@@ -929,7 +870,6 @@ 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)
@@ -1101,153 +1041,11 @@ 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:
@@ -1457,4 +1255,4 @@ 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, timeout=packet.timeout)
+    return Send(node=packet.node, arg=sanitized_arg)
@@ -8,7 +8,6 @@ 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
@@ -21,13 +20,9 @@ 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, TimeoutPolicy
+from langgraph.types import CachePolicy, RetryPolicy

 ##
 # Utilities borrowed from cloudpickle.
@@ -260,31 +255,8 @@ 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(
@@ -293,6 +265,5 @@ def _call_with_options(
        retry_policy=retry_policy,
        cache_policy=cache_policy,
        callbacks=config["callbacks"],
-        timeout=timeout,
    )
    return fut
@@ -1,26 +1,33 @@
 from __future__ import annotations

-from collections.abc import Callable, Mapping
+from collections.abc import Mapping
 from datetime import datetime, timezone
-from typing import Any, cast

-from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
-    BaseCheckpointSaver,
    Checkpoint,
+    CheckpointHydrationPlan,
+    IncrementalChannelSpec,
 )
 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 checkpoint_hydration_plan(
+    specs: Mapping[str, BaseChannel | ManagedValueSpec],
+) -> CheckpointHydrationPlan | None:
+    """Build a saver hydration plan from channel specs."""
+    channels = tuple(
+        IncrementalChannelSpec(name=name, kind=channel.checkpoint_hydration_kind)
+        for name, channel in specs.items()
+        if isinstance(channel, BaseChannel)
+        and channel.checkpoint_hydration_kind is not None
+    )
+    return CheckpointHydrationPlan(channels=channels) if channels else None


 def empty_checkpoint() -> Checkpoint:
@@ -34,30 +41,6 @@ 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,
@@ -65,91 +48,35 @@ 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:
-    """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.
-    """
+    """Create a checkpoint for the given channels."""
    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 channel_versions:
+            if k not in checkpoint["channel_versions"]:
                continue
-            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
+            v = channels[k].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=channel_versions,
+        channel_versions=checkpoint["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]:
-    """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.
-    """
+    """Get channels from a checkpoint."""
    channel_specs: dict[str, BaseChannel] = {}
    managed_specs: dict[str, ManagedValueSpec] = {}
    for k, v in specs.items():
@@ -157,71 +84,10 @@ def channels_from_checkpoint(
            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 = 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))
+    for k, v in channel_specs.items():
+        ch = v.from_checkpoint(checkpoint["channel_values"].get(k, MISSING))
+        ch.after_checkpoint(checkpoint["channel_versions"].get(k), checkpoint.get("id"))
        channels[k] = ch
    return channels, managed_specs

@@ -12,6 +12,7 @@ from contextlib import (
    ExitStack,
 )
 from datetime import datetime, timezone
+from functools import cached_property
 from inspect import signature
 from types import TracebackType
 from typing import (
@@ -29,6 +30,7 @@ from langgraph.checkpoint.base import (
    BaseCheckpointSaver,
    ChannelVersions,
    Checkpoint,
+    CheckpointHydrationPlan,
    CheckpointMetadata,
    CheckpointTuple,
    PendingWrite,
@@ -45,13 +47,11 @@ 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,
@@ -70,7 +70,6 @@ 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 (
@@ -89,18 +88,16 @@ 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,
+    checkpoint_hydration_plan,
    copy_checkpoint,
    create_checkpoint,
-    delta_channels_to_snapshot,
    empty_checkpoint,
 )
 from langgraph.pregel._executor import (
@@ -115,7 +112,6 @@ 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 (
@@ -124,7 +120,6 @@ 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,
@@ -196,46 +191,6 @@ 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
@@ -250,12 +205,10 @@ 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
@@ -363,8 +316,29 @@ 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
+
+    @cached_property
+    def _checkpoint_hydration_plan(self) -> CheckpointHydrationPlan | None:
+        """Build the saver hydration plan from this loop's channel specs."""
+        return checkpoint_hydration_plan(self.specs)
+
+    def _materialize_saved_checkpoint(
+        self, saved: CheckpointTuple | None
+    ) -> CheckpointTuple | None:
+        if saved is None or self.checkpointer is None:
+            return saved
+        return self.checkpointer.materialize_checkpoint_tuple(
+            saved, self._checkpoint_hydration_plan
+        )
+
+    async def _amaterialize_saved_checkpoint(
+        self, saved: CheckpointTuple | None
+    ) -> CheckpointTuple | None:
+        if saved is None or self.checkpointer is None:
+            return saved
+        return await self.checkpointer.amaterialize_checkpoint_tuple(
+            saved, self._checkpoint_hydration_plan
+        )

    def _push_graph_lifecycle_event(
        self,
@@ -372,16 +346,11 @@ 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=status,
+                    status=self.status,
                    checkpoint_id=self.checkpoint["id"],
                    checkpoint_ns=self.checkpoint_ns,
                )
@@ -390,7 +359,7 @@ class PregelLoop:
            self._graph_lifecycle_events.append(
                GraphInterruptEvent(
                    run_id=None,
-                    status=status,
+                    status=self.status,
                    checkpoint_id=self.checkpoint["id"],
                    checkpoint_ns=self.checkpoint_ns,
                    interrupts=interrupts,
@@ -448,14 +417,6 @@ 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,
@@ -471,7 +432,7 @@ class PregelLoop:
                    task = self.tasks.get(task_id)
                else:
                    task = None
-                fut = self.submit(
+                self.submit(
                    self.checkpointer_put_writes,
                    config,
                    writes_to_save,
@@ -479,23 +440,12 @@ class PregelLoop:
                    task_path_str(task.path) if task else "",
                )
            else:
-                fut = self.submit(
+                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)
@@ -575,20 +525,10 @@ class PregelLoop:
            self.tasks[pushed.id] = pushed
            # match any pending writes to the new task
            if not self.is_replaying:
-                self._reapply_writes_to_succeeded_nodes({pushed.id: pushed})
+                self._match_writes({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.

@@ -647,14 +587,9 @@ 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._reapply_writes_to_succeeded_nodes(self.tasks)
-            self._resume_error_handlers_if_applicable()
+            self._match_writes(self.tasks)

        # before execution, check if we should interrupt
        if self.interrupt_before and should_interrupt(
@@ -693,11 +628,6 @@ 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
@@ -721,88 +651,13 @@ class PregelLoop:

    # private

-    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.
-        """
+    def _match_writes(self, tasks: Mapping[str, PregelExecutableTask]) -> None:
        for tid, k, v in self.checkpoint_pending_writes:
-            if k in (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME):
+            if k in (ERROR, 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
@@ -990,27 +845,6 @@ 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"})
@@ -1023,18 +857,8 @@ class PregelLoop:
            # 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 is_time_traveling:
+            if self.is_replaying:
                replay_checkpoint_id = self.checkpoint["id"]
                if (
                    self.checkpoint_metadata.get("source")
@@ -1062,84 +886,33 @@ class PregelLoop:
        return updated_channels

    def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
-        # `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.
+        # assign step and parents
        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"]
+        if do_checkpoint and self.channels:
+            for k, ch in self.channels.items():
+                ch.after_checkpoint(
+                    self.checkpoint["channel_versions"].get(k),
+                    self.checkpoint.get("id"),
+                )
        # 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()
@@ -1198,99 +971,6 @@ 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,
@@ -1306,7 +986,6 @@ 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
@@ -1512,9 +1191,6 @@ 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()
@@ -1546,43 +1222,6 @@ 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)
@@ -1630,10 +1269,8 @@ 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
+        saved = self._materialize_saved_checkpoint(saved)
+
        if saved is None:
            saved = CheckpointTuple(
                self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
@@ -1649,7 +1286,6 @@ 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
@@ -1659,17 +1295,9 @@ 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,
-            saver=self.checkpointer,
-            config=self.checkpoint_config,
+            self.specs, self.checkpoint
        )
        self.stack.push(self._suppress_interrupt)
        self.status = "input"
@@ -1764,11 +1392,6 @@ 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
@@ -1800,43 +1423,6 @@ 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)
@@ -1887,10 +1473,8 @@ 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
+        saved = await self._amaterialize_saved_checkpoint(saved)
+
        if saved is None:
            saved = CheckpointTuple(
                self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
@@ -1906,7 +1490,6 @@ 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
@@ -1916,19 +1499,11 @@ 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 = await achannels_from_checkpoint(
-            self.specs,
-            self.checkpoint,
-            saver=self.checkpointer,
-            config=self.checkpoint_config,
+        self.channels, self.managed = channels_from_checkpoint(
+            self.specs, self.checkpoint
        )
        self.stack.push(self._suppress_interrupt)
        self.status = "input"
@@ -10,13 +10,11 @@ from typing import (
 from uuid import UUID, uuid4

 from langchain_core.callbacks import BaseCallbackHandler
-from langchain_core.messages import BaseMessage, ToolMessage
-from langchain_core.messages.utils import convert_to_messages
+from langchain_core.messages import BaseMessage
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, LLMResult
 from pydantic import BaseModel

-from langgraph._internal._config import filter_to_user_tags
-from langgraph._internal._constants import NS_SEP
+from langgraph._internal._constants import NS_END, NS_SEP
 from langgraph.constants import TAG_HIDDEN, TAG_NOSTREAM
 from langgraph.pregel.protocol import StreamChunk
 from langgraph.types import Command
@@ -26,11 +24,6 @@ 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]]

@@ -139,14 +132,23 @@ class StreamMessagesHandler(BaseCallbackHandler, _StreamingCallbackHandler):
        **kwargs: Any,
    ) -> Any:
        if metadata and (not tags or (TAG_NOSTREAM not in tags)):
-            ns = tuple(cast(str, metadata["langgraph_checkpoint_ns"]).split(NS_SEP))[
-                :-1
-            ]
+            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]
            if not self.subgraphs and len(ns) > 0 and ns != self.parent_ns:
                return
-            if (filtered_tags := filter_to_user_tags(tags)) is not None:
-                metadata["tags"] = filtered_tags
-            self.metadata[run_id] = (ns, metadata)
+            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)

    def on_llm_new_token(
        self,
@@ -254,208 +256,3 @@ 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
@@ -1,7 +1,6 @@
 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,
@@ -12,11 +11,10 @@ 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, TimeoutPolicy
+from langgraph.types import CachePolicy, RetryPolicy

 READ_TYPE = Callable[[str | Sequence[str], bool], Any | dict[str, Any]]
 INPUT_CACHE_KEY_TYPE = tuple[Callable[..., Any], tuple[str, ...]]
@@ -125,25 +123,12 @@ 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."""

@@ -159,10 +144,7 @@ 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)
@@ -174,11 +156,8 @@ 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:
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Will Fu-Hinthorn	9fac9da5f7	update	2026-04-21 15:43:24 -07:00
Will Fu-Hinthorn	def55a5ac5	fun	2026-04-21 14:31:43 -07:00
Will Fu-Hinthorn	6df1680436	foo	2026-04-21 13:52:00 -07:00
Sydney Runkle	43ecd9dc2d	fix(delta-channel): support non-list reducers (dict) and fix MISSING handling Use typ() instead of [] throughout DeltaChannel so reducers over dict (and other non-list types) work correctly. fromCheckpoint(MISSING) now leaves value as typ() from __init__ instead of overwriting with MISSING. copy() uses value.copy() to handle dicts. update() initialises base from typ() when value is MISSING. Add four tests covering the deepagents-style dict-merge / file-deletion reducer pattern.	2026-04-21 13:04:40 -04:00
Sydney RunkleandClaude Sonnet 4.6	c459079e52	chore(delta): rename _steps_since_rehydrate → _steps_since_snapshot; add audit tests - Rename `_steps_since_rehydrate` → `_steps_since_snapshot` in DeltaChannel for clarity (counts steps since the last snapshot, not since rehydration) - Pre-seed cycle-detection `visited` set with current checkpoint ID in both sync and async `_assemble_delta_channels` to prevent self-referential chains - Add 4 new unit tests: - `test_delta_channel_snapshot_every_emits_plain_list`: verifies counter semantics and snapshot/delta transitions - `test_delta_channel_snapshot_every_end_to_end`: graph-level smoke test - `test_delta_channel_assembly_fast_path_returns_delta_value`: exercises chain traversal via get_channel_blob returning DeltaValue then plain list - `test_delta_channel_assembly_broken_chain_logs_warning`: partial chain when get_tuple returns None Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 11:03:58 -04:00
Sydney RunkleandClaude Sonnet 4.6	ffda8b5472	chore: rename serde type tag "diff" → "delta" for DeltaValue Consistent with channel/type naming (DeltaChannel, DeltaValue). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 10:58:09 -04:00
Sydney RunkleandClaude Sonnet 4.6	374eebcd65	chore: apply format/lint fixes across checkpoint, checkpoint-postgres, prebuilt Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 10:50:27 -04:00
Sydney RunkleandClaude Sonnet 4.6	350182ed18	fix: register DeltaValue in SAFE_MSGPACK_TYPES; rename _is_diff_delta; cross-saver benchmark - Add DeltaValue to SAFE_MSGPACK_TYPES so SQLite and other msgpack-based savers don't emit "Deserializing unregistered type" warnings. - Rename _is_diff_delta → _is_delta_value (leftover from DiffChannel rename). - Parametrize benchmark by checkpointer: runs InMemory (fast-path) and SQLite (get_tuple fallback) in the same table, sharing the _run_turns helper. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 10:48:20 -04:00
Sydney RunkleandClaude Sonnet 4.6	4c2ce5c8a9	fix(delta-channel): fix chain assembly and get_state paths - Fix InMemorySaver.get_channel_blob: use correct storage[thread_id][ns] nesting and deserialize the checkpoint before extracting channel_versions. - Pass checkpoint_id to after_checkpoint() in channels_from_checkpoint so DeltaChannel seeds _last_checkpoint_id correctly on load; without this every turn broke the chain at its boundary. - Wire _assemble_delta_channels into _prepare_state_snapshot and _aprepare_state_snapshot (get_state / get_state_history paths) and into perform_superstep / aperform_superstep (update_state paths) — previously only the loop __enter__ path did assembly. - Fix test_get_channel_blob to use the correct storage structure. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 10:40:00 -04:00
Sydney Runkle	bae7486565	test(channels): replace unsupported-saver raise test with fallback assembly test	2026-04-21 10:06:51 -04:00
Sydney Runkle	b082584500	feat(postgres): remove _load_diff_chains; add get_channel_blob / aget_channel_blob	2026-04-21 10:06:13 -04:00
Sydney Runkle	503071c2aa	feat(memory): implement get_channel_blob; remove diff handling from _load_blobs	2026-04-21 10:05:08 -04:00
Sydney Runkle	c9913afef2	feat(pregel): wire DeltaChannel assembly into loop; pass checkpoint_id to after_checkpoint	2026-04-21 10:04:19 -04:00
Sydney Runkle	9fd6374302	feat(pregel): add _assemble_delta_channels helpers for universal DeltaChannel support	2026-04-21 09:37:49 -04:00
Sydney RunkleandClaude Sonnet 4.6	e6c065739f	feat(channels): DeltaChannel tracks checkpoint_id; emits prev_checkpoint_id in DeltaValue Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 09:34:44 -04:00
Sydney RunkleandClaude Sonnet 4.6	e18f8fff2b	feat(serde): diff type encodes prev_checkpoint_id; loads_typed returns DeltaValue Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-21 09:29:58 -04:00
Sydney Runkle	65438610e8	docs(checkpoint): expand aget_channel_blob docstring for parity	2026-04-21 09:28:21 -04:00
Sydney Runkle	4ebebd686a	chore: add .worktrees/ to .gitignore	2026-04-21 09:27:47 -04:00
Sydney Runkle	fca3f6d919	feat(checkpoint): DeltaValue uses prev_checkpoint_id; add get_channel_blob stubs	2026-04-21 09:27:22 -04:00
Sydney Runkle	599afd7585	chore: rename DiffChannel/DiffDelta/DiffChainValue to Delta* across libs Renames the diff-channel types to DeltaChannel, DeltaValue, and DeltaChainValue for consistency with the settled naming convention.	2026-04-21 07:56:43 -04:00
Sydney Runkle	c0e6062bfb	more tests	2026-04-20 12:53:54 -04:00
Sydney RunkleandClaude Sonnet 4.6	056d3143ff	chore: format/lint fixes for rehydrate_every benchmark Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 16:31:26 -04:00
Sydney RunkleandClaude Sonnet 4.6	1da43d412b	feat(channels): add rehydrate_every to DiffChannel for bounded chain traversal Periodic full-snapshot checkpoints cap chain depth, trading a small amount of extra storage for bounded reconstruction time. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 16:30:17 -04:00
Sydney RunkleandClaude Sonnet 4.6	df56b7cdf6	test(channels): add DiffChannel vs BinaryOperatorAggregate storage/time benchmark Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 16:21:28 -04:00
Sydney RunkleandClaude Sonnet 4.6	566a3150b2	chore: format and lint fixes for DiffChannel implementation Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 16:20:21 -04:00
Sydney RunkleandClaude Sonnet 4.6	1bb1811fbd	fix(checkpoint/postgres): pass cursor to avoid deadlock in diff chain traversal Fixes a critical deadlock that occurs when _load_diff_chains calls self._cursor() from within _load_blobs while the outer _load_checkpoint_tuple already holds self._cursor(). On bare (non-pool) connections, the threading.Lock is not reentrant, causing a deadlock. Solution: Pass the cursor as a parameter to _load_diff_chains and _load_blobs instead of acquiring a new cursor within those methods. Updated _load_checkpoint_tuple to acquire a cursor once at the top level and pass it through the call chain. Changes: - Updated _load_blobs signature to accept optional cur parameter - Updated _load_diff_chains signature (base and implementations) to accept optional cur parameter - Modified _load_checkpoint_tuple in PostgresSaver to acquire cursor and pass it - Modified _load_checkpoint_tuple_async to acquire cursor only when diff_payloads exist - Removed nested self._cursor() calls in _load_diff_chains and _load_diff_chains_async Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 16:05:58 -04:00
Sydney RunkleandClaude Sonnet 4.6	dd7f21e3ff	feat(checkpoint/postgres): diff chain reconstruction in async saver Add `_load_diff_chains_async` to `AsyncPostgresSaver` and override `_load_checkpoint_tuple` to inline blob-parsing and diff-chain resolution via async point-lookup traversal, mirroring the sync `PostgresSaver._load_diff_chains` implementation. Add integration test `test_diff_channel_chain_reconstruction` that skips gracefully when `langgraph` core is not installed. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 15:56:19 -04:00
Sydney RunkleandClaude Sonnet 4.6	d4e1efa1f6	feat(checkpoint/postgres): diff chain reconstruction in _load_blobs (sync) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 15:37:18 -04:00
Sydney RunkleandClaude Sonnet 4.6	dba1987c9b	test(pregel): strengthen DiffChannel time-travel and reply assertions Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 15:01:50 -04:00
Sydney RunkleandClaude Sonnet 4.6	9fb0493ac5	feat(pregel): call after_checkpoint hook when loading and saving channels Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:56:42 -04:00
Sydney RunkleandClaude Sonnet 4.6	1cb057e6bc	fix(checkpoint/memory): warn on broken diff chain, guard against cycles - Add logger.warning when a mid-chain blob is missing (fixes silent truncation bug) - Add cycle guard to prevent infinite loops on corrupt blob stores - Fix type annotation on diff_channels from dict[str, Any] to dict[str, str] Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:54:58 -04:00
Sydney RunkleandClaude Sonnet 4.6	d76127fbbf	feat(checkpoint/memory): chain-traverse diff blobs in _load_blobs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:52:34 -04:00
Sydney Runkle	94853fb14c	fix(channels): align DiffChannel.is_available with BinaryOperatorAggregate	2026-04-17 14:51:03 -04:00
Sydney RunkleandClaude Sonnet 4.6	e6fab22f0c	feat(channels): implement DiffChannel for incremental checkpoint storage Adds DiffChannel, a new channel type that stores only per-step write deltas in checkpoints and reconstructs the full list by replaying the chain through the operator at load time. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:35:46 -04:00
Sydney Runkle	ea644f413d	feat(channels): add no-op after_checkpoint hook to BaseChannel	2026-04-17 14:30:04 -04:00
Sydney RunkleandClaude Sonnet 4.6	3f86b1485d	fix(checkpoint/serde): use lazy isinstance check for DiffDelta Replace duck-typing check with lazy import inside _is_diff_delta helper function to avoid module-level circular dependency while using proper isinstance semantics. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:24:41 -04:00
Sydney RunkleandClaude Sonnet 4.5	9e40dee07f	feat(checkpoint/serde): serialize DiffDelta as 'diff' type tag Add serde support for DiffDelta by implementing dump/load for the "diff" type tag. This allows the checkpoint system to efficiently store delta objects by serializing them as msgpack-encoded dicts with {"d": delta, "p": prev_version} structure. The implementation uses runtime type checking to avoid circular imports and leverages the existing msgpack ext hooks for proper deserialization of complex types like LangChain messages. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>	2026-04-17 14:21:40 -04:00
Sydney RunkleandClaude Sonnet 4.6	4d1f4086eb	feat(checkpoint): add DiffDelta and DiffChainValue protocol types Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:18:09 -04:00
Sydney RunkleandClaude Sonnet 4.6	afcf6c03dd	docs: add DiffChannel implementation plan Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:14:50 -04:00
Sydney RunkleandClaude Sonnet 4.6	4b303ceb39	docs: add DiffChannel incremental checkpoint storage design spec Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-17 14:00:41 -04:00