fix(langgraph): don't save a checkpoint past a failed DeltaChannel write

A DeltaChannel is rebuilt from its writes along the parent chain, so a checkpoint saved without one of them reads back short for good. Each save now gets the delta writes submitted before it, and fails if one of them or the previous save failed. Co-authored-by: iroiro147 <265728356+iroiro147@users.noreply.github.com>
fix(langgraph): stop astream_events dropping control/interrupts on v1/v2 (#9219 )
2026-10-08 01:15:15 +02:00 · 2026-10-07 18:28:47 -04:00 · 2026-10-07 12:26:50 -04:00 · 2026-10-07 09:19:34 -04:00 · 2026-10-07 13:32:46 +01:00 · 2026-10-07 13:32:26 +01:00
80 changed files with 6865 additions and 1493 deletions
@@ -50,4 +50,4 @@ jobs:

      - name: Deploy to GitHub Pages
        id: deployment
-        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0
+        uses: actions/deploy-pages@368f82528645a54fb793d4d04e342629a3f51346 # v5.0.1
@@ -139,23 +139,10 @@ jobs:
            echo EOF
          } >> "$GITHUB_OUTPUT"

-  test-pypi-publish:
-    needs:
-      - build
-      - release-notes
-    permissions:
-      contents: read
-      id-token: write
-    uses: ./.github/workflows/_test_release.yml
-    with:
-      working-directory: ${{ inputs.working-directory }}
-    secrets: inherit
-
  pre-release-checks:
    needs:
      - build
      - release-notes
-      - test-pypi-publish
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -180,31 +167,20 @@ jobs:
          enable-cache: false
          working-directory: ${{ inputs.working-directory }}

-      - name: Import published package
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: dist
+          path: ${{ inputs.working-directory }}/dist/
+
+      - name: Import dist package
        shell: bash
        working-directory: ${{ inputs.working-directory }}
        env:
          PKG_NAME: ${{ needs.build.outputs.pkg-name }}
          VERSION: ${{ needs.build.outputs.version }}
-        # Here we use:
-        # - The default regular PyPI index as the *primary* index, meaning
-        #   that it takes priority (https://pypi.org/simple)
-        # - The test PyPI index as an extra index, so that any dependencies that
-        #   are not found on test PyPI can be resolved and installed anyway.
-        #   (https://test.pypi.org/simple). This will include the PKG_NAME==VERSION
-        #   package because VERSION will not have been uploaded to regular PyPI yet.
-        # - attempt install again after 5 seconds if it fails because there is
-        #   sometimes a delay in availability on test pypi
+        # Install directly from the locally-built wheel (no index resolution needed).
        run: |
-          uv run pip install \
-            --extra-index-url https://test.pypi.org/simple/ \
-            "$PKG_NAME==$VERSION" || \
-          ( \
-            sleep 5 && \
-            uv run pip install \
-              --extra-index-url https://test.pypi.org/simple/ \
-              "$PKG_NAME==$VERSION" \
-          )
+          uv run pip install dist/*.whl

          if [[ "$PKG_NAME" == *prebuilt* ]]; then
            uv run pip install langgraph
@@ -226,7 +202,7 @@ jobs:
        run: uv sync --group test
        working-directory: ${{ inputs.working-directory }}

-      # Overwrite the local version of the package with the test PyPI version.
+      # Overwrite the local version of the package with the built version
      - name: Import published package (again)
        working-directory: ${{ inputs.working-directory }}
        shell: bash
@@ -234,14 +210,25 @@ jobs:
          PKG_NAME: ${{ needs.build.outputs.pkg-name }}
          VERSION: ${{ needs.build.outputs.version }}
        run: |
-          uv run pip install \
-            --extra-index-url https://test.pypi.org/simple/ \
-            "$PKG_NAME==$VERSION"
+          uv run pip install dist/*.whl

      - name: Run unit tests
        run: make test
        working-directory: ${{ inputs.working-directory }}

+  test-pypi-publish:
+    needs:
+      - build
+      - release-notes
+      - pre-release-checks
+    permissions:
+      contents: read
+      id-token: write
+    uses: ./.github/workflows/_test_release.yml
+    with:
+      working-directory: ${{ inputs.working-directory }}
+    secrets: inherit
+
  publish:
    needs:
      - build
@@ -267,6 +267,61 @@ async def test_history_seed_ancestor_own_writes_are_replayed(
    )


+# Every uuid4 `build_delta_chain` tags its own writes with sorts between these
+# two, so task_id order is fixed and always disagrees with task_path order.
+TASK_ID_SORTS_FIRST = "00000000-0000-0000-0000-000000000000"
+TASK_ID_SORTS_LAST = "ffffffff-ffff-ffff-ffff-ffffffffffff"
+
+
+async def test_history_orders_parallel_writes_by_task_path(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Writes from parallel tasks replay in task_path order, not task_id order."""
+    configs = await build_delta_chain(
+        saver,
+        thread_id=str(uuid4()),
+        channel="ch",
+        snapshots_at_steps=[0],
+        total_steps=3,
+    )
+    step_1, head = configs[1], configs[2]
+    await saver.aput_writes(
+        step_1, [("ch", "second")], TASK_ID_SORTS_FIRST, "~pull, 02"
+    )
+    await saver.aput_writes(step_1, [("ch", "first")], TASK_ID_SORTS_LAST, "~pull, 01")
+
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    values = [w[2] for w in result["ch"]["writes"]]
+    assert values == [1, "first", "second"], (
+        f"Expected task_path order [1, 'first', 'second'], got {values}. "
+        "Ordering by (task_id, idx) alone yields [1, 'second', 'first']."
+    )
+
+
+async def test_history_orders_pathless_writes_first(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Writes stored without a task_path (graph input) replay before task writes."""
+    configs = await build_delta_chain(
+        saver,
+        thread_id=str(uuid4()),
+        channel="ch",
+        snapshots_at_steps=[0],
+        total_steps=3,
+    )
+    step_1, head = configs[1], configs[2]
+    await saver.aput_writes(
+        step_1, [("ch", "from_node")], TASK_ID_SORTS_FIRST, "~pull, a"
+    )
+    await saver.aput_writes(step_1, [("ch", "from_input")], TASK_ID_SORTS_LAST)
+
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    values = [w[2] for w in result["ch"]["writes"]]
+    assert values == [1, "from_input", "from_node"], (
+        f"Expected pathless writes first, got {values}"
+    )
+
+
 ALL_DELTA_CHANNEL_HISTORY_TESTS = [
    test_history_returns_writes_oldest_first,
    test_history_seed_is_nearest_snapshot,
@@ -276,6 +331,8 @@ ALL_DELTA_CHANNEL_HISTORY_TESTS = [
    test_history_walk_to_root_no_seed,
    test_history_migration_plain_value_as_seed,
    test_history_seed_ancestor_own_writes_are_replayed,
+    test_history_orders_parallel_writes_by_task_path,
+    test_history_orders_pathless_writes_first,
 ]


@@ -176,6 +176,35 @@ async def test_get_tuple_pending_writes(saver: BaseCheckpointSaver) -> None:
    )


+async def test_get_tuple_pending_writes_in_writes_sort_key_order(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """pending_writes come back in writes_sort_key order, not put or task_id order."""
+    config = generate_config(str(uuid4()))
+    stored = await saver.aput(config, generate_checkpoint(), generate_metadata(), {})
+    await saver.aput_writes(
+        stored, [("ch", "b")], "00000000-0000-0000-0000-000000000000", "~pull, 02"
+    )
+    await saver.aput_writes(
+        stored,
+        [("ch", "a1"), ("ch", "a2")],
+        "ffffffff-ffff-ffff-ffff-ffffffffffff",
+        "~pull, 01",
+    )
+    await saver.aput_writes(
+        stored, [("ch", "input")], "88888888-8888-8888-8888-888888888888"
+    )
+
+    tup = await saver.aget_tuple(stored)
+    assert tup is not None
+    values = [w[2] for w in tup.pending_writes or []]
+    assert values == ["input", "a1", "a2", "b"], (
+        f"Expected writes_sort_key order ['input', 'a1', 'a2', 'b'], got {values}. "
+        "Put order gives ['b', 'a1', 'a2', 'input'], task_id order gives "
+        "['b', 'input', 'a1', 'a2']."
+    )
+
+
 async def test_get_tuple_respects_namespace(saver: BaseCheckpointSaver) -> None:
    """checkpoint_ns filtering."""
    tid = str(uuid4())
@@ -223,6 +252,7 @@ ALL_GET_TUPLE_TESTS = [
    test_get_tuple_metadata,
    test_get_tuple_parent_config,
    test_get_tuple_pending_writes,
+    test_get_tuple_pending_writes_in_writes_sort_key_order,
    test_get_tuple_respects_namespace,
    test_get_tuple_nonexistent_checkpoint_id,
 ]
@@ -279,7 +279,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
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+version = "0.16.9"
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+sdist = { url = "https://files.pythonhosted.org/packages/96/bf/c935ca98e73fe8ce65b87ef08a280c0c1e85295d569228c15e87d8fdfaf1/ruff-0.16.9.tar.gz", hash = "sha256:12b625c6cfba78d285d9f48eda5f053374f1e53cb10ef17342a383750db99161", size = 4948764, upload-time = "2026-09-24T20:37:49.416Z" }
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-    { url = "https://files.pythonhosted.org/packages/7f/3e/5db95bcf282c52709639744ca2a8b149baccf648e39c8cc87553df9eae0c/urllib3-2.7.0-py3-none-any.whl", hash = "sha256:9fb4c81ebbb1ce9531cce37674bbc6f1360472bc18ca9a553ede278ef7276897", size = 131087, upload-time = "2026-05-07T16:13:17.151Z" },
+    { url = "https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl", hash = "sha256:0cf3cae568d36aa9576b28dfb35f11328f1cb974ca7647d9475ebb86c75ac6e3", size = 135717, upload-time = "2026-09-15T19:29:34.577Z" },
 ]

 [[package]]
@@ -448,11 +448,12 @@ class PostgresSaver(BasePostgresSaver):

        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 1 (paged): dynamic SELECT over `checkpoints` with three
+          columns per channel: its version, an `EXISTS` probe for a stored
+          blob at that version, and its inline value. 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 a page comes
+          back short.

        * Stage 2 (per-channel UNION ALL): one branch per channel reading
          `checkpoint_writes` filtered to that channel's specific
@@ -687,5 +687,23 @@ class AsyncPostgresSaver(BasePostgresSaver):
            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`, guarded like `get_tuple`."""
+        try:
+            if asyncio.get_running_loop() is self.loop:
+                raise asyncio.InvalidStateError(
+                    "Synchronous calls to AsyncPostgresSaver 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()
+

 __all__ = ["AsyncPostgresSaver", "AsyncShallowPostgresSaver", "Conn"]
@@ -14,6 +14,7 @@ from langgraph.checkpoint.base import (
    DeltaChannelHistory,
    PendingWrite,
    get_checkpoint_id,
+    writes_sort_key,
 )
 from langgraph.checkpoint.serde.types import TASKS
 from psycopg.types.json import Jsonb
@@ -109,7 +110,7 @@ select
    ) as channel_values,
    (
        select
-        array_agg(array[cw.task_id::text::bytea, cw.channel::bytea, cw.type::bytea, cw.blob] order by cw.task_id, cw.idx)
+        array_agg(array[cw.task_id::text::bytea, cw.channel::bytea, cw.type::bytea, cw.blob, convert_to(cw.task_path, 'UTF8'), cw.idx::text::bytea])
        from checkpoint_writes cw
        where cw.thread_id = checkpoints.thread_id
            and cw.checkpoint_ns = checkpoints.checkpoint_ns
@@ -168,34 +169,13 @@ class _DeltaStage2Row(TypedDict, total=False):
    type: str | None
    blob: bytes | None
    task_id: str | None  # "w" rows only
+    task_path: 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).
+# Delta history is rebuilt in two queries; `_build_delta_stage1_sql` and
+# `_build_delta_stage2_sql` document their shapes.


 def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
@@ -319,7 +299,7 @@ def _build_delta_stage2_sql(
        branches.append(
            "SELECT 'w'::text AS _kind, "
            "checkpoint_id, channel, "
-            "type, blob, task_id, idx, NULL::text AS version "
+            "type, blob, task_id, task_path, idx, NULL::text AS version "
            "FROM checkpoint_writes "
            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
            "AND checkpoint_id = ANY(%s)"
@@ -327,7 +307,8 @@ def _build_delta_stage2_sql(
    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 "
+            "type, blob, NULL::text AS task_id, NULL::text AS task_path, "
+            "NULL::int AS idx, version "
            "FROM checkpoint_blobs "
            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
            "AND version = %s"
@@ -335,10 +316,8 @@ def _build_delta_stage2_sql(
    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.
+# Stage 1 rows are dicts keyed by the per-channel aliases
+# `_build_delta_stage1_sql` emits, so there is no static TypedDict.


 class BasePostgresSaver(BaseCheckpointSaver[str]):
@@ -431,9 +410,11 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
          (a) it found a stored value for its channel — a blob or an inline
              primitive (channel becomes seeded),
          (b) it reached a real root (parent_of[cid] is None — fully
-              materialized at this point), or
+              materialized at this point),
          (c) the next ancestor cid isn't in `parent_of` yet (waiting for
-              a later page; the cursor stays put).
+              a later page; the cursor stays put), or
+          (d) the target's own row isn't in `parent_of` yet (the walk has
+              not started; no cursor is set, so a later page retries).

        Mutates `chain_by_ch`, `seed_ver_by_ch`, `seed_inline_by_ch`,
        `walk_cursor_by_ch`, and `seeded` in place.
@@ -441,9 +422,12 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
        for i, ch in enumerate(channels):
            if ch in seeded:
                continue
-            # First-time entry: cursor starts at the target's parent.
+            # Pages start at the thread head, so the target may not have
+            # loaded yet; a `None` cursor would read as "target is a root".
            if ch not in walk_cursor_by_ch:
-                walk_cursor_by_ch[ch] = parent_of.get(target_id)
+                if target_id not in parent_of:
+                    continue
+                walk_cursor_by_ch[ch] = parent_of[target_id]
            cur_cid = walk_cursor_by_ch[ch]
            ch_chain = chain_by_ch[ch]
            hb_i = hb_by_i_by_cid[i]
@@ -492,10 +476,11 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
        stored value, or when the seed blob is sentinel "empty" — in both cases
        the consumer treats absence as "start empty".
        """
-        # writes_by_ch_by_cid[channel][cid] = list of (type, blob, task_id, idx)
-        writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
-            ch: {} for ch in channels
-        }
+        # writes_by_ch_by_cid[channel][cid] = list of
+        # (type, blob, task_id, idx, task_path)
+        writes_by_ch_by_cid: dict[
+            str, dict[str, list[tuple[str, bytes, str, int, str]]]
+        ] = {ch: {} for ch in channels}
        # seed_blob_by_ver[(channel, version)] = (type, blob)
        seed_blob_by_ver: dict[tuple[str, str], tuple[str, bytes]] = {}

@@ -506,8 +491,14 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                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"]),
+                        "tuple[str, bytes, str, int, str]",
+                        (
+                            r["type"],
+                            r["blob"],
+                            r["task_id"],
+                            r["idx"],
+                            r["task_path"],
+                        ),
                    )
                )
            else:  # kind == "b"
@@ -516,10 +507,10 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                    "tuple[str, bytes]", (r["type"], r["blob"])
                )

-        # Sort writes per (channel, cid) newest-first by (task_id, idx)
+        # Sort writes per (channel, cid) newest-first
        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)
+                ws.sort(key=lambda w: writes_sort_key(w[4], w[2], w[3]), reverse=True)

        result: dict[str, DeltaChannelHistory] = {}
        for ch in channels:
@@ -529,7 +520,9 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
            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, []):
+                for type_tag, write_blob, task_id, _idx, _path in cid_writes.get(
+                    cid, []
+                ):
                    val = self.serde.loads_typed((type_tag, write_blob))
                    collected.append((task_id, ch, val))
            collected.reverse()
@@ -572,20 +565,15 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
        ]

    def _load_writes(
-        self, writes: list[tuple[bytes, bytes, bytes, bytes]]
+        self, writes: list[tuple[bytes, bytes, bytes, bytes, bytes, bytes]] | None
    ) -> list[tuple[str, str, Any]]:
-        return (
-            [
-                (
-                    tid.decode(),
-                    channel.decode(),
-                    self.serde.loads_typed((t.decode(), v)),
-                )
-                for tid, channel, t, v in writes
-            ]
-            if writes
-            else []
-        )
+        return [
+            (tid.decode(), channel.decode(), self.serde.loads_typed((t.decode(), v)))
+            for tid, channel, t, v, _, _ in sorted(
+                writes or [],
+                key=lambda w: writes_sort_key(w[4].decode(), w[0].decode(), int(w[5])),
+            )
+        ]

    def _dump_writes(
        self,
@@ -97,7 +97,7 @@ select
    ) as channel_values,
    (
        select
-        array_agg(array[cw.task_id::text::bytea, cw.channel::bytea, cw.type::bytea, cw.blob] order by cw.task_id, cw.idx)
+        array_agg(array[cw.task_id::text::bytea, cw.channel::bytea, cw.type::bytea, cw.blob, convert_to(cw.task_path, 'UTF8'), cw.idx::text::bytea])
        from checkpoint_writes cw
        where cw.thread_id = checkpoints.thread_id
            and cw.checkpoint_ns = checkpoints.checkpoint_ns
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=4.1.0,<5.0.0",
+  "langgraph-checkpoint>=4.3.0,<5.0.0",
  "orjson>=3.11.5",
  "psycopg>=3.2.0",
  "psycopg-pool>=3.2.0",
@@ -0,0 +1,132 @@
+from __future__ import annotations
+
+from typing import Any
+from uuid import uuid4
+
+import pytest
+from langgraph.checkpoint.base import (
+    Checkpoint,
+    DeltaChannelHistory,
+    empty_checkpoint,
+)
+from langgraph.checkpoint.base.id import uuid6
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+from langgraph.checkpoint.postgres import PostgresSaver
+from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
+from langgraph.checkpoint.postgres.base import _DELTA_PAGE_SIZE
+from tests.conftest import DEFAULT_URI
+
+CHANNEL = "items"
+STEPS = 8
+SEED_STEP = 1
+SEED_VALUE = [10, 20]
+TARGET_STEP = 4
+
+# The real page size is the control; the rest leave the target off the first
+# page (three checkpoints are newer than it).
+PAGE_SIZES = [_DELTA_PAGE_SIZE, 3, 2, 1]
+
+
+def _step_args(
+    thread_id: str, step: int, parent: dict | None
+) -> tuple[dict, Checkpoint, dict[str, Any]]:
+    config: dict = {"configurable": {"thread_id": thread_id, "checkpoint_ns": ""}}
+    if parent is not None:
+        config["configurable"]["checkpoint_id"] = parent["configurable"][
+            "checkpoint_id"
+        ]
+    checkpoint: Checkpoint = empty_checkpoint()
+    checkpoint["id"] = str(uuid6(clock_seq=step))
+    checkpoint["channel_versions"][CHANNEL] = f"v{step}"
+    if step == SEED_STEP:
+        checkpoint["channel_values"][CHANNEL] = _DeltaSnapshot(list(SEED_VALUE))
+        return config, checkpoint, {CHANNEL: f"v{step}"}
+    return config, checkpoint, {}
+
+
+async def _abuild_chain(saver: AsyncPostgresSaver) -> list[dict]:
+    thread_id = str(uuid4())
+    parent: dict | None = None
+    configs: list[dict] = []
+    for step in range(STEPS):
+        config, checkpoint, new_versions = _step_args(thread_id, step, parent)
+        parent = await saver.aput(
+            config,
+            checkpoint,
+            {"source": "loop", "step": step, "parents": {}},
+            new_versions,
+        )
+        await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
+        configs.append(parent)
+    return configs
+
+
+def _build_chain(saver: PostgresSaver) -> list[dict]:
+    thread_id = str(uuid4())
+    parent: dict | None = None
+    configs: list[dict] = []
+    for step in range(STEPS):
+        config, checkpoint, new_versions = _step_args(thread_id, step, parent)
+        parent = saver.put(
+            config,
+            checkpoint,
+            {"source": "loop", "step": step, "parents": {}},
+            new_versions,
+        )
+        saver.put_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
+        configs.append(parent)
+    return configs
+
+
+def _assert_history(entry: DeltaChannelHistory, page_size: int) -> None:
+    seed = entry.get("seed")
+    assert isinstance(seed, _DeltaSnapshot), (
+        f"page_size={page_size}: expected a snapshot seed, "
+        f"got {entry.get('seed', '<missing>')!r}"
+    )
+    assert seed.value == SEED_VALUE
+    assert [w[2] for w in entry["writes"]] == ["w1", "w2", "w3"], (
+        f"page_size={page_size}: got {[w[2] for w in entry['writes']]}"
+    )
+
+
+@pytest.mark.parametrize("page_size", PAGE_SIZES)
+async def test_async_target_older_than_the_first_page(
+    page_size: int, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setattr("langgraph.checkpoint.postgres.aio._DELTA_PAGE_SIZE", page_size)
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        configs = await _abuild_chain(saver)
+        result = await saver.aget_delta_channel_history(
+            config=configs[TARGET_STEP], channels=[CHANNEL]
+        )
+        _assert_history(result[CHANNEL], page_size)
+
+
+@pytest.mark.parametrize("page_size", PAGE_SIZES)
+def test_sync_target_older_than_the_first_page(
+    page_size: int, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    monkeypatch.setattr("langgraph.checkpoint.postgres._DELTA_PAGE_SIZE", page_size)
+    with PostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        saver.setup()
+        configs = _build_chain(saver)
+        result = saver.get_delta_channel_history(
+            config=configs[TARGET_STEP], channels=[CHANNEL]
+        )
+        _assert_history(result[CHANNEL], page_size)
+
+
+async def test_root_target_has_no_history_and_still_terminates(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setattr("langgraph.checkpoint.postgres.aio._DELTA_PAGE_SIZE", 1)
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        configs = await _abuild_chain(saver)
+        result = await saver.aget_delta_channel_history(
+            config=configs[0], channels=[CHANNEL]
+        )
+        assert result[CHANNEL] == {"writes": []}
@@ -17,16 +17,16 @@ wheels = [

 [[package]]
 name = "anyio"
-version = "4.14.2"
+version = "4.15.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "exceptiongroup", marker = "python_full_version < '3.11'" },
    { name = "idna" },
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/61/cc/a381afa6efea9f496eff839d4a6a1aed3bfafc7b3ab4b0d1b243a12573dd/anyio-4.14.2.tar.gz", hash = "sha256:cfa139f3ed1a23ee8f88a145ddb5ac7605b8bbfd8592baacd7ce3d8bb4313c7f", size = 260176, upload-time = "2026-07-12T20:29:07.082Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a9/d2/f4d173e22df740bc37b1db102b386ba719b66e95b0f0d751f556b387e6d2/anyio-4.15.1.tar.gz", hash = "sha256:9f28306018cbd6d329e64a36d58256edff76dd996fe423bc957326e578b82a94", size = 276966, upload-time = "2026-09-05T10:42:39.44Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/da/35/f2287558c17e29fafc8ef3daf819bb9834061cfa43bff8014f7df7f63bdc/anyio-4.14.2-py3-none-any.whl", hash = "sha256:9f505dda5ac9f0c8309b5e8bd445a8c2bf7246f3ce950121e45ea15bc41d1494", size = 125813, upload-time = "2026-07-12T20:29:05.763Z" },
+    { url = "https://files.pythonhosted.org/packages/12/b8/4bd346e22b28902df4d651910f5242c28d84e4a5c2435ca5c3f797ed7e2e/anyio-4.15.1-py3-none-any.whl", hash = "sha256:6152fdbbf9a77fdec97731721bebf7c4c44f7c29b424b0065826173efc7ed101", size = 132079, upload-time = "2026-09-05T10:42:37.923Z" },
 ]

 [[package]]
@@ -159,7 +159,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" } },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -254,7 +254,8 @@ dependencies = [
    { name = "pydantic" },
    { name = "pyyaml" },
    { name = "tenacity" },
-    { name = "typing-extensions" },
+    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
    { name = "uuid-utils" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/6e/58/3ad53096eee1e07728e8219ded30ae308b0f2b8b7b26b8ebb6371917c0f5/langchain_core-1.5.2.tar.gz", hash = "sha256:2d13ab35b42eec63d4669a483776b8cdd778ee764107149369fb369d84c08c41", size = 972322, upload-time = "2026-07-28T16:38:37.977Z" }
@@ -267,7 +268,8 @@ name = "langchain-protocol"
 version = "0.0.18"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/d2/59/b5959aea96faa9146e2e49a7a22882b3528c62efafe9a6a95beab30c2305/langchain_protocol-0.0.18.tar.gz", hash = "sha256:ec3e11782f1ed0c9db38e5a9ed01b0e7a0d3fba406faa8aef6594b73c56a63e6", size = 6150, upload-time = "2026-06-18T17:08:26.959Z" }
 wheels = [
@@ -276,7 +278,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "../checkpoint" }
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+version = "4.16.0"
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+]
+
 [[package]]
 name = "typing-inspection"
 version = "0.4.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.15'" },
+    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
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+version = "2.8.0"
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 [[package]]
@@ -40,24 +40,12 @@ with SqliteSaver.from_conn_string(":memory:") as checkpointer:
        "v": 4,
        "ts": "2024-07-31T20:14:19.804150+00:00",
        "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {
-            "my_key": "meow",
-            "node": "node"
-        },
-        "channel_versions": {
-            "__start__": 2,
-            "my_key": 3,
-            "start:node": 3,
-            "node": 3
-        },
+        "channel_values": {"my_key": "meow", "node": "node"},
+        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
        "versions_seen": {
            "__input__": {},
-            "__start__": {
-                "__start__": 1
-            },
-            "node": {
-                "start:node": 2
-            }
+            "__start__": {"__start__": 1},
+            "node": {"start:node": 2},
        },
    }

@@ -81,24 +69,12 @@ async with AsyncSqliteSaver.from_conn_string(":memory:") as checkpointer:
        "v": 4,
        "ts": "2024-07-31T20:14:19.804150+00:00",
        "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {
-            "my_key": "meow",
-            "node": "node"
-        },
-        "channel_versions": {
-            "__start__": 2,
-            "my_key": 3,
-            "start:node": 3,
-            "node": 3
-        },
+        "channel_values": {"my_key": "meow", "node": "node"},
+        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
        "versions_seen": {
            "__input__": {},
-            "__start__": {
-                "__start__": 1
-            },
-            "node": {
-                "start:node": 2
-            }
+            "__start__": {"__start__": 1},
+            "node": {"start:node": 2},
        },
    }

@@ -29,7 +29,11 @@ from langgraph.checkpoint.sqlite._delta import (
    build_delta_stage2_sql,
    step_walk_with_row,
 )
-from langgraph.checkpoint.sqlite.utils import search_where
+from langgraph.checkpoint.sqlite.utils import (
+    load_pending_writes,
+    pending_writes_sql,
+    search_where,
+)

 _AIO_ERROR_MSG = (
    "The SqliteSaver does not support async methods. "
@@ -81,6 +85,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):

    conn: sqlite3.Connection
    is_setup: bool
+    _has_task_path: bool = True

    def __init__(
        self,
@@ -154,6 +159,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                checkpoint_ns TEXT NOT NULL DEFAULT '',
                checkpoint_id TEXT NOT NULL,
                task_id TEXT NOT NULL,
+                task_path TEXT NOT NULL DEFAULT '',
                idx INTEGER NOT NULL,
                channel TEXT NOT NULL,
                type TEXT,
@@ -162,6 +168,19 @@ class SqliteSaver(BaseCheckpointSaver[str]):
            );
            """
        )
+        # sqlite has no ADD COLUMN IF NOT EXISTS; this migrates databases
+        # created before `task_path` existed and is a no-op on the rest.
+        try:
+            self.conn.execute(
+                "ALTER TABLE writes ADD COLUMN task_path TEXT NOT NULL DEFAULT ''"
+            )
+        except sqlite3.OperationalError as e:
+            # A read-only database from before the column can still be read;
+            # its rows would all read back as '' anyway.
+            if "readonly database" in str(e):
+                self._has_task_path = False
+            elif "duplicate column name" not in str(e):
+                raise

        self.is_setup = True

@@ -260,7 +279,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                    }
                # find any pending writes
                cur.execute(
-                    "SELECT task_id, channel, type, value FROM writes WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ? ORDER BY task_id, idx",
+                    pending_writes_sql(self._has_task_path),
                    (
                        str(config["configurable"]["thread_id"]),
                        checkpoint_ns,
@@ -286,10 +305,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                        if parent_checkpoint_id
                        else None
                    ),
-                    [
-                        (task_id, channel, self.serde.loads_typed((type, value)))
-                        for task_id, channel, type, value in cur
-                    ],
+                    load_pending_writes(cur, self.serde),
                )

    def list(
@@ -351,7 +367,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                metadata,
            ) in cur:
                wcur.execute(
-                    "SELECT task_id, channel, type, value FROM writes WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ? ORDER BY task_id, idx",
+                    pending_writes_sql(self._has_task_path),
                    (thread_id, checkpoint_ns, checkpoint_id),
                )
                yield CheckpointTuple(
@@ -378,10 +394,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                        if parent_checkpoint_id
                        else None
                    ),
-                    [
-                        (task_id, channel, self.serde.loads_typed((type, value)))
-                        for task_id, channel, type, value in wcur
-                    ],
+                    load_pending_writes(wcur, self.serde),
                )

    def put(
@@ -460,9 +473,9 @@ class SqliteSaver(BaseCheckpointSaver[str]):
            task_path: Path of the task creating the writes.
        """
        query = (
-            "INSERT OR REPLACE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"
+            "INSERT OR REPLACE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, task_path, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
            if all(w[0] in WRITES_IDX_MAP for w in writes)
-            else "INSERT OR IGNORE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"
+            else "INSERT OR IGNORE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, task_path, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
        )
        with self.cursor() as cur:
            cur.executemany(
@@ -473,6 +486,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                        str(config["configurable"]["checkpoint_ns"]),
                        str(config["configurable"]["checkpoint_id"]),
                        task_id,
+                        task_path,
                        WRITES_IDX_MAP.get(channel, idx),
                        channel,
                        *self.serde.dumps_typed(value),
@@ -507,13 +521,12 @@ class SqliteSaver(BaseCheckpointSaver[str]):

        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 1 (streamed): recursive CTE over `checkpoints` following
+          `parent_checkpoint_id` from the target, returning
+          `(checkpoint_id, type, checkpoint)` per ancestor. Sqlite has no
+          JSONB, so we ship the full serialized checkpoint blob and inspect
+          `channel_values` in Python. Stops reading 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
@@ -538,12 +551,14 @@ class SqliteSaver(BaseCheckpointSaver[str]):
        seeded: set[str] = set()

        with self.cursor(transaction=False) as cur:
-            cur.execute(DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id))
+            cur.execute(
+                DELTA_STAGE1_SQL,
+                (thread_id, checkpoint_ns, checkpoint_id, thread_id, checkpoint_ns),
+            )
            for row in cur:
-                cid, parent_cid, type_tag, blob = row
+                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,
@@ -558,6 +573,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):

            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
            stage2_sql = build_delta_stage2_sql(
+                has_task_path=self._has_task_path,
                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
            )
            if stage2_sql:
@@ -568,7 +584,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                    )
                cur.execute(stage2_sql, stage2_params)
                stage2_rows = cast(
-                    "list[tuple[str, str, str, int, str, bytes]]", cur.fetchall()
+                    "list[tuple[str, str, str, int, str, bytes, str]]", cur.fetchall()
                )
            else:
                stage2_rows = []
@@ -24,22 +24,45 @@ from __future__ import annotations
 from collections.abc import Mapping, Sequence
 from typing import Any

-from langgraph.checkpoint.base import DeltaChannelHistory, PendingWrite
+from langgraph.checkpoint.base import (
+    DeltaChannelHistory,
+    PendingWrite,
+    writes_sort_key,
+)

-# 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).
+# Stage 1 streams target, then its ancestors nearest-first, by following
+# `parent_checkpoint_id` rather than id order: ids are only monotonic within
+# one process, so a range scan by id can miss a parent whose id sorts above
+# its child's. Target is the anchor row; its own writes/seed are skipped
+# (matches the `BaseCheckpointSaver` contract).
+#
+# `put` is `INSERT OR REPLACE`, so re-putting an existing id under a
+# descendant's config makes the chain a loop. `step_walk_with_row` stops on a
+# repeated id; sqlite yields recursive rows lazily, so abandoning the cursor
+# ends the recursion.
+#
+# `CROSS JOIN` pins `ancestors` as the outer loop, so each step is one primary
+# key lookup. With a plain `JOIN` and no `ANALYZE` stats, sqlite can put
+# `checkpoints` outside and scan the whole thread per step.
 DELTA_STAGE1_SQL = (
+    "WITH RECURSIVE ancestors(checkpoint_id, parent_checkpoint_id, type, "
+    "checkpoint) AS ("
    "SELECT checkpoint_id, parent_checkpoint_id, type, checkpoint "
    "FROM checkpoints "
-    "WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id <= ? "
-    "ORDER BY checkpoint_id DESC"
+    "WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ? "
+    "UNION ALL "
+    "SELECT c.checkpoint_id, c.parent_checkpoint_id, c.type, c.checkpoint "
+    "FROM ancestors a CROSS JOIN checkpoints c "
+    "ON c.checkpoint_id = a.parent_checkpoint_id "
+    "WHERE c.thread_id = ? AND c.checkpoint_ns = ?"
+    ") "
+    "SELECT checkpoint_id, type, checkpoint FROM ancestors"
 )


-def build_delta_stage2_sql(*, chain_lens: Sequence[int]) -> str:
+def build_delta_stage2_sql(
+    *, chain_lens: Sequence[int], has_task_path: bool = True
+) -> str:
    """Stage-2 per-channel UNION ALL fetching writes from `writes`.

    One branch per channel with a non-empty chain. Each branch inlines its
@@ -53,11 +76,12 @@ def build_delta_stage2_sql(*, chain_lens: Sequence[int]) -> str:
    of a single `channel = ANY(channels)` filter when channels have
    different chain depths — same rationale as postgres.
    """
+    task_path = "task_path" if has_task_path else "''"
    branches: list[str] = []
    for n in chain_lens:
        cid_placeholders = ",".join("?" * n)
        branches.append(
-            "SELECT checkpoint_id, channel, task_id, idx, type, value "
+            f"SELECT checkpoint_id, channel, task_id, idx, type, value, {task_path} "
            "FROM writes "
            "WHERE thread_id = ? AND checkpoint_ns = ? AND channel = ? "
            f"AND checkpoint_id IN ({cid_placeholders})"
@@ -68,7 +92,6 @@ def build_delta_stage2_sql(*, chain_lens: Sequence[int]) -> str:
 def step_walk_with_row(
    *,
    cid: str,
-    parent_cid: str | None,
    type_tag: str,
    blob: bytes,
    target_id: str,
@@ -81,36 +104,32 @@ def step_walk_with_row(
 ) -> 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).
+    The cursor returns (cid, type, blob) rows in walk order starting at
+    target. The first row is target itself and is skipped (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
+    For each subsequent row 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.
+    Returns True when the caller can stop iterating and close the cursor:
+    every requested channel is seeded, or the chain revisited a checkpoint.
    """
    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}
+            walk_state["walked"] = {cid}
        # 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
+    walked: set[str] = walk_state["walked"]
+    if cid in walked:
+        return True
+    walked.add(cid)
    for ch in active:
        chain_by_ch[ch].append(cid)
    ckpt = serde.loads_typed((type_tag, blob))
@@ -120,7 +139,6 @@ def step_walk_with_row(
        seeded.add(ch)
        active.discard(ch)
    del ckpt, channel_values
-    walk_state["cur_cid"] = parent_cid
    return not active


@@ -130,29 +148,31 @@ def build_delta_channels_writes_history(
    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]],
+    stage2_rows: Sequence[tuple[str, str, str, int, str, bytes, str]],
    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`.
+    Stage-2 rows are
+    `(checkpoint_id, channel, task_id, idx, type, value, task_path)`.
+    Final write order is oldest→newest globally and `writes_sort_key`
+    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: dict[
+        str, dict[str, list[tuple[str, bytes, str, int, str]]]
+    ] = {ch: {} for ch in channels}
+    for cid, ch, task_id, idx, type_tag, value_blob, task_path in stage2_rows:
        writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
-            (type_tag, value_blob, task_id, idx)
+            (type_tag, value_blob, task_id, idx, task_path)
        )
    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]))
+            ws.sort(key=lambda w: writes_sort_key(w[4], w[2], w[3]))

    result: dict[str, DeltaChannelHistory] = {}
    for ch in channels:
@@ -161,7 +181,7 @@ def build_delta_channels_writes_history(
        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, []):
+            for type_tag, value_blob, task_id, _idx, _path in cid_writes.get(cid, []):
                collected.append(
                    (task_id, ch, serde.loads_typed((type_tag, value_blob)))
                )
@@ -30,7 +30,11 @@ from langgraph.checkpoint.sqlite._delta import (
    build_delta_stage2_sql,
    step_walk_with_row,
 )
-from langgraph.checkpoint.sqlite.utils import search_where
+from langgraph.checkpoint.sqlite.utils import (
+    load_pending_writes,
+    pending_writes_sql,
+    search_where,
+)

 T = TypeVar("T", bound=Callable)

@@ -114,6 +118,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):

    lock: asyncio.Lock
    is_setup: bool
+    _has_task_path: bool = True

    def __init__(
        self,
@@ -331,6 +336,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                    checkpoint_ns TEXT NOT NULL DEFAULT '',
                    checkpoint_id TEXT NOT NULL,
                    task_id TEXT NOT NULL,
+                    task_path TEXT NOT NULL DEFAULT '',
                    idx INTEGER NOT NULL,
                    channel TEXT NOT NULL,
                    type TEXT,
@@ -341,6 +347,21 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
            ):
                await self.conn.commit()

+            # sqlite has no ADD COLUMN IF NOT EXISTS; this migrates databases
+            # created before `task_path` existed and is a no-op on the rest.
+            try:
+                await self.conn.execute(
+                    "ALTER TABLE writes ADD COLUMN task_path TEXT NOT NULL DEFAULT ''"
+                )
+                await self.conn.commit()
+            except aiosqlite.OperationalError as e:
+                # A read-only database from before the column can still be read;
+                # its rows would all read back as '' anyway.
+                if "readonly database" in str(e):
+                    self._has_task_path = False
+                elif "duplicate column name" not in str(e):
+                    raise
+
            self.is_setup = True

    async def aget_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
@@ -395,7 +416,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                    }
                # find any pending writes
                await cur.execute(
-                    "SELECT task_id, channel, type, value FROM writes WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ? ORDER BY task_id, idx",
+                    pending_writes_sql(self._has_task_path),
                    (
                        str(config["configurable"]["thread_id"]),
                        checkpoint_ns,
@@ -421,10 +442,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                        if parent_checkpoint_id
                        else None
                    ),
-                    [
-                        (task_id, channel, self.serde.loads_typed((type, value)))
-                        async for task_id, channel, type, value in cur
-                    ],
+                    load_pending_writes(await cur.fetchall(), self.serde),
                )

    async def alist(
@@ -473,7 +491,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                metadata,
            ) in cur:
                await wcur.execute(
-                    "SELECT task_id, channel, type, value FROM writes WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ? ORDER BY task_id, idx",
+                    pending_writes_sql(self._has_task_path),
                    (thread_id, checkpoint_ns, checkpoint_id),
                )
                yield CheckpointTuple(
@@ -500,10 +518,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                        if parent_checkpoint_id
                        else None
                    ),
-                    [
-                        (task_id, channel, self.serde.loads_typed((type, value)))
-                        async for task_id, channel, type, value in wcur
-                    ],
+                    load_pending_writes(await wcur.fetchall(), self.serde),
                )

    async def aput(
@@ -576,9 +591,9 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
            task_path: Path of the task creating the writes.
        """
        query = (
-            "INSERT OR REPLACE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"
+            "INSERT OR REPLACE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, task_path, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
            if all(w[0] in WRITES_IDX_MAP for w in writes)
-            else "INSERT OR IGNORE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"
+            else "INSERT OR IGNORE INTO writes (thread_id, checkpoint_ns, checkpoint_id, task_id, task_path, idx, channel, type, value) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
        )
        await self.setup()
        async with self.lock, self.conn.cursor() as cur:
@@ -590,6 +605,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                        str(config["configurable"]["checkpoint_ns"]),
                        str(config["configurable"]["checkpoint_id"]),
                        task_id,
+                        task_path,
                        WRITES_IDX_MAP.get(channel, idx),
                        channel,
                        *self.serde.dumps_typed(value),
@@ -625,8 +641,8 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
        """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
+        is the async equivalent using `aiosqlite` cursors. Stage 1 streams
+        the parent chain from the target and Python-deserializes each
        checkpoint blob to find per-channel snapshots; stage 2 fetches
        only the relevant writes via per-channel UNION ALL.
        """
@@ -650,13 +666,13 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):

        async with self.lock, self.conn.cursor() as cur:
            await cur.execute(
-                DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id)
+                DELTA_STAGE1_SQL,
+                (thread_id, checkpoint_ns, checkpoint_id, thread_id, checkpoint_ns),
            )
            async for row in cur:
-                cid, parent_cid, type_tag, blob = row
+                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,
@@ -671,6 +687,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):

            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
            stage2_sql = build_delta_stage2_sql(
+                has_task_path=self._has_task_path,
                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
            )
            if stage2_sql:
@@ -681,7 +698,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
                    )
                await cur.execute(stage2_sql, stage2_params)
                stage2_rows = cast(
-                    "list[tuple[str, str, str, int, str, bytes]]",
+                    "list[tuple[str, str, str, int, str, bytes, str]]",
                    await cur.fetchall(),
                )
            else:
@@ -2,11 +2,12 @@ from __future__ import annotations

 import json
 import re
-from collections.abc import Sequence
+from collections.abc import Iterable, Sequence
 from typing import Any

 from langchain_core.runnables import RunnableConfig
-from langgraph.checkpoint.base import get_checkpoint_id
+from langgraph.checkpoint.base import PendingWrite, get_checkpoint_id, writes_sort_key
+from langgraph.checkpoint.serde.base import SerializerProtocol

 _FILTER_PATTERN = re.compile(r"^[a-zA-Z0-9_.-]+$")

@@ -114,3 +115,23 @@ def search_where(
        param_values.append(get_checkpoint_id(before))

    return ("WHERE " + " AND ".join(wheres) if wheres else "", param_values)
+
+
+def pending_writes_sql(has_task_path: bool) -> str:
+    task_path = "task_path" if has_task_path else "''"
+    return (
+        f"SELECT task_id, channel, type, value, {task_path}, idx FROM writes "
+        "WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id = ?"
+    )
+
+
+def load_pending_writes(
+    rows: Iterable[Any], serde: SerializerProtocol
+) -> list[PendingWrite]:
+    """Deserialize `pending_writes_sql` rows in `writes_sort_key` order."""
+    return [
+        (task_id, channel, serde.loads_typed((type_, value)))
+        for task_id, channel, type_, value, _, _ in sorted(
+            rows, key=lambda r: writes_sort_key(r[4], r[0], r[5])
+        )
+    ]
@@ -547,7 +547,7 @@ class AsyncSqliteStore(AsyncBatchedBaseStore, BaseSqliteStore):
            await cur.execute(query, params)
            rows = await cur.fetchall()

-            if needs_refresh and rows and self.ttl_config:
+            if needs_refresh and self.ttl_config:
                keys_to_refresh = []
                for row_data in rows:
                    # Assuming row_data[0] is prefix (text), row_data[1] is key (text)
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=4.1.0,<5.0.0",
+    "langgraph-checkpoint>=4.3.0,<5.0.0",
    "aiosqlite>=0.20",
    "sqlite-vec>=0.1.6",
 ]
@@ -0,0 +1,104 @@
+from __future__ import annotations
+
+from typing import Any
+
+import pytest
+from langgraph.checkpoint.base import (
+    BaseCheckpointSaver,
+    Checkpoint,
+    DeltaChannelHistory,
+    empty_checkpoint,
+)
+
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite._delta import DELTA_STAGE1_SQL
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+CHANNEL = "ch"
+CONFIG: dict[str, Any] = {"configurable": {"thread_id": "t", "checkpoint_ns": ""}}
+EXPECTED: DeltaChannelHistory = {
+    "writes": [("task", CHANNEL, "write-root")],
+    "seed": "seed",
+}
+
+
+def _checkpoint(checkpoint_id: str, values: dict[str, Any]) -> Checkpoint:
+    value = empty_checkpoint()
+    value["id"] = checkpoint_id
+    value["channel_values"] = values
+    return value
+
+
+PARENT_ID_ORDERS = [
+    pytest.param("z-older", "a-newer", id="parent_id_sorts_above_child"),
+    pytest.param("a-older", "z-newer", id="parent_id_sorts_below_child"),
+]
+
+
+@pytest.mark.parametrize(("root_id", "child_id"), PARENT_ID_ORDERS)
+def test_sync_walk_reaches_parent_whatever_the_id_order(
+    root_id: str, child_id: str
+) -> None:
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        root = saver.put(CONFIG, _checkpoint(root_id, {CHANNEL: "seed"}), {}, {})
+        saver.put_writes(root, [(CHANNEL, "write-root")], "task")
+        child = saver.put(root, _checkpoint(child_id, {}), {}, {})
+
+        got = saver.get_delta_channel_history(config=child, channels=[CHANNEL])
+        reference = BaseCheckpointSaver.get_delta_channel_history(
+            saver, config=child, channels=[CHANNEL]
+        )
+        assert got[CHANNEL] == EXPECTED
+        assert got[CHANNEL] == reference[CHANNEL], "fast path disagrees with base"
+
+
+@pytest.mark.parametrize(("root_id", "child_id"), PARENT_ID_ORDERS)
+async def test_async_walk_reaches_parent_whatever_the_id_order(
+    root_id: str, child_id: str
+) -> None:
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        root = await saver.aput(CONFIG, _checkpoint(root_id, {CHANNEL: "seed"}), {}, {})
+        await saver.aput_writes(root, [(CHANNEL, "write-root")], "task")
+        child = await saver.aput(root, _checkpoint(child_id, {}), {}, {})
+
+        got = await saver.aget_delta_channel_history(config=child, channels=[CHANNEL])
+        assert got[CHANNEL] == EXPECTED
+
+
+def test_walk_reaches_root_of_long_chain_with_descending_ids() -> None:
+    steps = 40
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        parent = saver.put(
+            CONFIG, _checkpoint(f"id-{steps:03d}", {CHANNEL: "seed"}), {}, {}
+        )
+        saver.put_writes(parent, [(CHANNEL, "write-root")], "task")
+        for step in range(steps - 1, 0, -1):
+            parent = saver.put(parent, _checkpoint(f"id-{step:03d}", {}), {}, {})
+
+        got = saver.get_delta_channel_history(config=parent, channels=[CHANNEL])
+        assert got[CHANNEL] == EXPECTED
+
+
+def test_walk_terminates_when_put_makes_the_parent_chain_cycle() -> None:
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        a = saver.put(CONFIG, _checkpoint("cid-a", {}), {}, {})
+        b = saver.put(a, _checkpoint("cid-b", {}), {}, {})
+        repoint_a_under_b = _checkpoint("cid-a", {})
+        saver.put(b, repoint_a_under_b, {}, {})
+
+        got = saver.get_delta_channel_history(config=b, channels=[CHANNEL])
+        assert got[CHANNEL] == {"writes": []}
+
+
+def test_walk_step_looks_up_the_parent_by_primary_key() -> None:
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        saver.setup()
+        plan = [
+            row[3]
+            for row in saver.conn.execute(
+                f"EXPLAIN QUERY PLAN {DELTA_STAGE1_SQL}", ("t", "", "id", "t", "")
+            )
+        ]
+    assert any(
+        step.startswith("SEARCH c ") and "checkpoint_id=?" in step for step in plan
+    ), f"recursive step should look up the parent by key, got {plan}"
@@ -0,0 +1,151 @@
+import sqlite3
+from collections.abc import Iterator
+from contextlib import closing
+from pathlib import Path
+
+import aiosqlite
+import pytest
+from langgraph.checkpoint.base import empty_checkpoint
+
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+WRITES_BEFORE_TASK_PATH = """
+CREATE TABLE writes (
+    thread_id TEXT NOT NULL,
+    checkpoint_ns TEXT NOT NULL DEFAULT '',
+    checkpoint_id TEXT NOT NULL,
+    task_id TEXT NOT NULL,
+    idx INTEGER NOT NULL,
+    channel TEXT NOT NULL,
+    type TEXT,
+    value BLOB,
+    PRIMARY KEY (thread_id, checkpoint_ns, checkpoint_id, task_id, idx)
+);
+INSERT INTO writes VALUES ('t', '', 'c', 'old-task', 0, 'ch', 'null', X'');
+"""
+
+
+@pytest.fixture
+def legacy_db(tmp_path: Path) -> Path:
+    db = tmp_path / "legacy.sqlite"
+    with sqlite3.connect(db) as conn:
+        conn.executescript(WRITES_BEFORE_TASK_PATH)
+    return db
+
+
+def test_setup_migrates_legacy_writes_table_repeatably(legacy_db: Path) -> None:
+    for _ in range(2):
+        with SqliteSaver.from_conn_string(str(legacy_db)) as saver:
+            saver.setup()
+            rows = saver.conn.execute(
+                "SELECT task_id, task_path FROM writes"
+            ).fetchall()
+            assert rows == [("old-task", "")]
+
+
+@pytest.mark.parametrize("fresh", [True, False], ids=["fresh", "legacy"])
+def test_put_writes_persists_task_path(
+    tmp_path: Path, legacy_db: Path, fresh: bool
+) -> None:
+    db = tmp_path / "fresh.sqlite" if fresh else legacy_db
+    with SqliteSaver.from_conn_string(str(db)) as saver:
+        config = saver.put(
+            {"configurable": {"thread_id": "t", "checkpoint_ns": ""}},
+            empty_checkpoint(),
+            {},
+            {},
+        )
+        saver.put_writes(config, [("ch", "v")], "task-1", "~__pregel_pull, node")
+        stored = saver.conn.execute(
+            "SELECT task_path FROM writes WHERE task_id = 'task-1'"
+        ).fetchall()
+    assert stored == [("~__pregel_pull, node",)]
+
+
+async def test_async_setup_migrates_legacy_writes_table_repeatably(
+    legacy_db: Path,
+) -> None:
+    for _ in range(2):
+        async with AsyncSqliteSaver.from_conn_string(str(legacy_db)) as saver:
+            await saver.setup()
+            config = await saver.aput(
+                {"configurable": {"thread_id": "t", "checkpoint_ns": ""}},
+                empty_checkpoint(),
+                {},
+                {},
+            )
+            await saver.aput_writes(
+                config, [("ch", "v")], "task-1", "~__pregel_pull, node"
+            )
+
+    async with aiosqlite.connect(legacy_db) as conn:
+        async with conn.execute(
+            "SELECT DISTINCT task_id, task_path FROM writes ORDER BY task_id"
+        ) as cur:
+            assert await cur.fetchall() == [
+                ("old-task", ""),
+                ("task-1", "~__pregel_pull, node"),
+            ]
+
+
+@pytest.fixture
+def busy_db(tmp_path: Path) -> Iterator[Path]:
+    db = tmp_path / "busy.sqlite"
+    with SqliteSaver.from_conn_string(str(db)) as saver:
+        saver.setup()
+    with closing(sqlite3.connect(db, isolation_level=None)) as writer:
+        writer.execute("BEGIN IMMEDIATE")
+        yield db
+        writer.execute("ROLLBACK")
+
+
+def test_setup_does_not_wait_on_another_writer(busy_db: Path) -> None:
+    with closing(sqlite3.connect(busy_db, timeout=0)) as conn:
+        SqliteSaver(conn).setup()
+
+
+async def test_async_setup_does_not_wait_on_another_writer(busy_db: Path) -> None:
+    async with aiosqlite.connect(busy_db, timeout=0) as conn:
+        await AsyncSqliteSaver(conn).setup()
+
+
+def _legacy_database_with_history(db: Path) -> dict:
+    root = empty_checkpoint()
+    root["channel_values"] = {"ch": "seed"}
+    root["channel_versions"] = {"ch": 1}
+    with SqliteSaver.from_conn_string(str(db)) as saver:
+        root_config = saver.put(
+            {"configurable": {"thread_id": "t", "checkpoint_ns": ""}},
+            root,
+            {},
+            {"ch": 1},
+        )
+        saver.put_writes(root_config, [("ch", "write")], "task", "~__pregel_pull, n")
+        child = saver.put(root_config, empty_checkpoint(), {}, {})
+        saver.conn.execute("ALTER TABLE writes DROP COLUMN task_path")
+        saver.conn.commit()
+    return child
+
+
+def test_read_only_legacy_database_still_reads_delta_history(tmp_path: Path) -> None:
+    db = tmp_path / "legacy.sqlite"
+    child = _legacy_database_with_history(db)
+
+    saver = SqliteSaver(sqlite3.connect(f"file:{db}?mode=ro", uri=True))
+    got = saver.get_delta_channel_history(config=child, channels=["ch"])
+
+    assert got["ch"] == {"seed": "seed", "writes": [("task", "ch", "write")]}
+
+
+async def test_async_read_only_legacy_database_still_reads_delta_history(
+    tmp_path: Path,
+) -> None:
+    db = tmp_path / "legacy.sqlite"
+    child = _legacy_database_with_history(db)
+
+    async with aiosqlite.connect(f"file:{db}?mode=ro", uri=True) as conn:
+        saver = AsyncSqliteSaver(conn)
+        got = await saver.aget_delta_channel_history(config=child, channels=["ch"])
+
+    assert got["ch"] == {"seed": "seed", "writes": [("task", "ch", "write")]}
@@ -285,7 +285,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -783,14 +783,14 @@ wheels = [

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+version = "3.16.0"
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+    { url = "https://files.pythonhosted.org/packages/db/5b/b83a9bf1a3b4ec222f9fa083147ff6816245223da0ab92370e7e056f113f/pytest_mock-3.16.0-py3-none-any.whl", hash = "sha256:007cfeb257801d88d9c0b2a7b5a15a15e73b71968dfd72e7bf8c4a2f8393aec8", size = 10016, upload-time = "2026-09-27T14:57:54.283Z" },
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 [[package]]
@@ -162,6 +162,14 @@ class DeltaChannelHistory(TypedDict):
      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.
+
+      Within a single checkpoint, writes are ordered by `writes_sort_key`,
+      `(task_path, task_id, idx)`, which is the order live execution applies
+      a super-step's task writes in. `task_id` is a hash of the path, so
+      ordering by it permutes parallel tasks writing one channel, and
+      reducers need not be order-invariant. Writes stored without a
+      `task_path` (graph input, `update_state` and `Command` updates, rows
+      predating the column) sort first, by `task_id`.
    * `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
@@ -174,6 +182,20 @@ class DeltaChannelHistory(TypedDict):
    seed: NotRequired[Any]


+def writes_sort_key(
+    task_path: str, task_id: str = "", idx: int = 0
+) -> tuple[str, str, int]:
+    """Sort key for the writes of one super-step.
+
+    Live execution applies a super-step's tasks in this order, so a saver
+    that replays stored writes, as `get_delta_channel_history` does, must
+    sort them by it too, or an order-sensitive reducer rebuilds a different
+    value than the run produced. `task_path` is the string passed to
+    `put_writes`.
+    """
+    return (task_path, task_id, idx)
+
+
 class BaseCheckpointSaver(Generic[V]):
    """Base class for creating a graph checkpointer.

@@ -244,7 +266,8 @@ class BaseCheckpointSaver(Generic[V]):
            config: Configuration specifying which checkpoint to retrieve.

        Returns:
-            The requested checkpoint tuple, or `None` if not found.
+            The requested checkpoint tuple, or `None` if not found. Its
+                `pending_writes` must be in `writes_sort_key` order.

        Raises:
            NotImplementedError: Implement this method in your custom checkpoint saver.
@@ -434,7 +457,8 @@ class BaseCheckpointSaver(Generic[V]):
            config: Configuration specifying which checkpoint to retrieve.

        Returns:
-            The requested checkpoint tuple, or `None` if not found.
+            The requested checkpoint tuple, or `None` if not found. Its
+                `pending_writes` must be in `writes_sort_key` order.

        Raises:
            NotImplementedError: Implement this method in your custom checkpoint saver.
@@ -611,6 +635,10 @@ class BaseCheckpointSaver(Generic[V]):
        `PostgresSaver`) override for performance; the return contract is
        fixed here.

+        `PendingWrite` carries no `task_path`, so this default replays each
+        checkpoint's writes in `get_tuple`'s `pending_writes` order, which
+        `get_tuple` must return in `writes_sort_key` order.
+
        Args:
            config: Configuration identifying the target checkpoint.
            channels: Channel names to walk for. Empty → empty mapping.
@@ -25,6 +25,7 @@ from langgraph.checkpoint.base import (
    SerializerProtocol,
    get_checkpoint_id,
    get_checkpoint_metadata,
+    writes_sort_key,
 )

 logger = logging.getLogger(__name__)
@@ -139,6 +140,15 @@ class InMemorySaver(
            result[k] = self.serde.loads_typed(vv)
        return result

+    def _ordered_writes(
+        self, thread_id: str, checkpoint_ns: str, checkpoint_id: str
+    ) -> list[tuple[str, str, tuple[str, bytes], str]]:
+        stored = self.writes.get((thread_id, checkpoint_ns, checkpoint_id), {})
+        return [
+            stored[k]
+            for k in sorted(stored, key=lambda k: writes_sort_key(stored[k][3], *k))
+        ]
+
    def get_delta_channel_history(
        self, *, config: RunnableConfig, channels: Sequence[str]
    ) -> Mapping[str, DeltaChannelHistory]:
@@ -198,9 +208,8 @@ class InMemorySaver(
                    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
+            for tid, ch, serialized, _ in reversed(
+                self._ordered_writes(thread_id, checkpoint_ns, cp_id)
            ):
                if ch not in remaining:
                    continue
@@ -246,7 +255,7 @@ class InMemorySaver(
        if checkpoint_id := get_checkpoint_id(config):
            if saved := self.storage[thread_id][checkpoint_ns].get(checkpoint_id):
                checkpoint, metadata, parent_checkpoint_id = saved
-                writes = self.writes[(thread_id, checkpoint_ns, checkpoint_id)].values()
+                writes = self._ordered_writes(thread_id, checkpoint_ns, checkpoint_id)
                checkpoint_: Checkpoint = self.serde.loads_typed(checkpoint)
                return CheckpointTuple(
                    config=config,
@@ -276,7 +285,7 @@ class InMemorySaver(
            if checkpoints := self.storage[thread_id][checkpoint_ns]:
                checkpoint_id = max(checkpoints.keys())
                checkpoint, metadata, parent_checkpoint_id = checkpoints[checkpoint_id]
-                writes = self.writes[(thread_id, checkpoint_ns, checkpoint_id)].values()
+                writes = self._ordered_writes(thread_id, checkpoint_ns, checkpoint_id)
                checkpoint_ = self.serde.loads_typed(checkpoint)
                return CheckpointTuple(
                    config={
@@ -379,9 +388,9 @@ class InMemorySaver(
                    elif limit is not None:
                        limit -= 1

-                    writes = self.writes[
-                        (thread_id, checkpoint_ns, checkpoint_id)
-                    ].values()
+                    writes = self._ordered_writes(
+                        thread_id, checkpoint_ns, checkpoint_id
+                    )

                    checkpoint_: Checkpoint = self.serde.loads_typed(checkpoint)

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

 [project]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -268,7 +268,7 @@ wheels = [

 [[package]]
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-version = "1.6.1"
+version = "1.6.5"
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    { name = "httpx" },
@@ -282,9 +282,9 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
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 [[package]]
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-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
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+    { url = "https://files.pythonhosted.org/packages/6d/1c/e6e91852b72566b1ab9aca504712857dfb89324c12092a5bd61d42d34427/ty-0.0.84-py3-none-win_arm64.whl", hash = "sha256:6c9d3718c4a0d318bc9c92af9b2aa85c3294e7dff54cf1d69ad79568f56516da", size = 13656453, upload-time = "2026-09-24T13:16:21.51Z" },
 ]

 [[package]]
@@ -1338,11 +1338,11 @@ wheels = [

 [[package]]
 name = "urllib3"
-version = "2.7.0"
+version = "2.8.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/53/0c/06f8b233b8fd13b9e5ee11424ef85419ba0d8ba0b3138bf360be2ff56953/urllib3-2.7.0.tar.gz", hash = "sha256:231e0ec3b63ceb14667c67be60f2f2c40a518cb38b03af60abc813da26505f4c", size = 433602, upload-time = "2026-05-07T16:13:18.596Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e3/05/b17359e1cefb4f909b5e40b1b90a496d987258916dbbf88e842c729f510e/urllib3-2.8.0.tar.gz", hash = "sha256:63bf2ead4c879426ebf22ef2a781eeb4aa3b4ae798a0435506f8687fd5bb9b63", size = 458972, upload-time = "2026-09-15T19:29:36.253Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/7f/3e/5db95bcf282c52709639744ca2a8b149baccf648e39c8cc87553df9eae0c/urllib3-2.7.0-py3-none-any.whl", hash = "sha256:9fb4c81ebbb1ce9531cce37674bbc6f1360472bc18ca9a553ede278ef7276897", size = 131087, upload-time = "2026-05-07T16:13:17.151Z" },
+    { url = "https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl", hash = "sha256:0cf3cae568d36aa9576b28dfb35f11328f1cb974ca7647d9475ebb86c75ac6e3", size = 135717, upload-time = "2026-09-15T19:29:34.577Z" },
 ]

 [[package]]
@@ -103,6 +103,8 @@ The CLI uses a `langgraph.json` configuration file with these key settings:
 }
 ```

+Git dependencies should use credential-free URLs. The CLI conservatively scans direct `langgraph.json` dependencies, common Python package files, uv project and lock files, and common Node.js package and lock files for HTTP Git URLs with userinfo. This check is not exhaustive: generated Docker builds can copy other files, including nested requirement or constraint files, into image layers without scanning them. For private dependencies, provide short-lived credentials through your build environment's secret-backed Git credential helper. Do not store credentials in copied files such as `langgraph.json` or `pip_config_file`.
+
 See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.

 ## Development
@@ -9,8 +9,8 @@
  },
  "dependencies": {
    "@js-monorepo-example/shared": "*",
-    "@langchain/core": "^1.2.9",
-    "@langchain/langgraph": "^1.4.13"
+    "@langchain/core": "^1.2.13",
+    "@langchain/langgraph": "^1.4.18"
  },
  "devDependencies": {
    "typescript": "^7.0.2"
@@ -17,18 +17,18 @@
    "lint": "eslint 'apps/**/*.ts' 'libs/**/*.ts'"
  },
  "devDependencies": {
-    "turbo": "^2.10.12",
+    "turbo": "^2.11.5",
    "typescript": "^7.0.2",
    "@tsconfig/recommended": "^1.0.13",
-    "@eslint/eslintrc": "^3.3.6",
+    "@eslint/eslintrc": "^3.3.7",
    "@eslint/js": "^10.0.1",
-    "eslint": "^10.9.1",
+    "eslint": "^10.11.0",
    "eslint-config-prettier": "^10.1.8",
    "eslint-plugin-import": "^2.27.5",
    "eslint-plugin-no-instanceof": "^1.0.1",
    "eslint-plugin-prettier": "^5.5.6",
-    "@typescript-eslint/eslint-plugin": "^8.68.0",
-    "@typescript-eslint/parser": "^8.68.0",
-    "prettier": "^3.9.6"
+    "@typescript-eslint/eslint-plugin": "^8.70.1",
+    "@typescript-eslint/parser": "^8.70.1",
+    "prettier": "^3.9.9"
  }
 }
@@ -2,6 +2,24 @@
 # yarn lockfile v1


+"@cacheable/memory@^2.2.0":
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/@cacheable/memory/-/memory-2.2.0.tgz#72aeb8b051f6d597d10ac8595b94ad8302bd2239"
+  integrity sha512-CTLKqLItRCEixEAewD3/j9DB3/o96gpTPD4eJ1v+DGOlxZRZncRQkGYqqnAGCscYd6RNeXfGeiuCphsPtqyIfQ==
+  dependencies:
+    "@cacheable/utils" "^2.5.0"
+    "@keyv/bigmap" "^1.3.1"
+    hookified "^1.15.1"
+    keyv "^5.6.0"
+
+"@cacheable/utils@^2.5.0":
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/@cacheable/utils/-/utils-2.5.0.tgz#534c91113aa48fe43baedb169550b6ee070ef303"
+  integrity sha512-buipgOVDkkPXNR5+xBpDw7Zk2n1EvU7qBJCNUcL7rhQ//kfpOXPAvQ511Os0vpLYJ1pZnvudNytkQt2hst3wqA==
+  dependencies:
+    hashery "^1.5.1"
+    keyv "^5.6.0"
+
 "@cfworker/json-schema@^4.0.2":
  version "4.1.1"
  resolved "https://registry.yarnpkg.com/@cfworker/json-schema/-/json-schema-4.1.1.tgz#4a2a3947ee9fa7b7c24be981422831b8674c3be6"
@@ -42,10 +60,10 @@
  dependencies:
    "@types/json-schema" "^7.0.15"

-"@eslint/eslintrc@^3.3.6":
-  version "3.3.6"
-  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.3.6.tgz#d22bfd6b3a7d8e1f2c0b2f2e6de111b53ec6e13e"
-  integrity sha512-l2Ul9PrHsPCKcEY/ac7VgFj9D80C7S68sOKc618SyHDPK36s1XcFebXY0iTzUVn4Yq+YbwvSnDmCz9yxjX+QrA==
+"@eslint/eslintrc@^3.3.7":
+  version "3.3.7"
+  resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.3.7.tgz#76d3dedec4a30ea32df797bf8a0085c1311b7316"
+  integrity sha512-F42g89Qd5oAWtp0k0nnSrjziAKza7w8SVT4mStc18LZMaRb4J1HQAHLCalEtDCxrTuksx7NU9qsmeLwpOfPqWw==
  dependencies:
    ajv "^6.14.0"
    debug "^4.3.2"
@@ -53,7 +71,7 @@
    globals "^14.0.0"
    ignore "^5.2.0"
    import-fresh "^3.2.1"
-    js-yaml "^4.3.0"
+    js-yaml "^4.3.2"
    minimatch "^3.1.5"
    strip-json-comments "^3.1.1"

@@ -67,10 +85,10 @@
  resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-3.0.5.tgz#88e9bf4d11d2b19c082e78ebe7ce88724a5eb091"
  integrity sha512-vqTaUEgxzm+YDSdElad6PiRoX4t8VGDjCtt05zn4nU810UIx/uNEV7/lZJ6KwFThKZOzOxzXy48da+No7HZaMw==

-"@eslint/plugin-kit@^0.7.2":
-  version "0.7.2"
-  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.7.2.tgz#4b0962f3f2c7ce8bc98b3ecfe34525c09d2cb729"
-  integrity sha512-+CNAzxglkrpNf/kKywqQfk74QjtceuOE7Qm+AF8miRvPF/wmmK5+OJOgVh3AVTT3RP2mH3+FOaxlE5v72owk0A==
+"@eslint/plugin-kit@^0.7.3":
+  version "0.7.3"
+  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.7.3.tgz#cc7268cc36405b331ef92db1bc37971f21d66fe1"
+  integrity sha512-IkO+/KEUvwbVpiURZg+P7zF74z5Jxe0UgJxVni+RtoHQ6IZieXaO02kmadomap/q+l6bc/jdPGGqTjhuZnuz1Q==
  dependencies:
    "@eslint/core" "^1.2.1"
    levn "^0.4.1"
@@ -103,10 +121,23 @@
  resolved "https://registry.yarnpkg.com/@isaacs/cliui/-/cliui-9.0.0.tgz#4d0a3f127058043bf2e7ee169eaf30ed901302f3"
  integrity sha512-AokJm4tuBHillT+FpMtxQ60n8ObyXBatq7jD2/JA9dxbDDokKQm8KMht5ibGzLVU9IJDIKK4TPKgMHEYMn3lMg==

-"@langchain/core@^1.2.9":
-  version "1.2.9"
-  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.2.9.tgz#4f5fb27ba07c51ce4fb8e1dc32eb36945737afa1"
-  integrity sha512-conzSEj9Zu1AyXJLXsSbgrtxtxinmI1yGqQ5CIJZSoV5rvv+yvQE/vgBnoySpBQ/bl3YPgj2FL/gbDjWykLSfg==
+"@keyv/bigmap@^1.3.1":
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/@keyv/bigmap/-/bigmap-1.3.1.tgz#fc82fa83947e7ff68c6798d08907db842771ef2c"
+  integrity sha512-WbzE9sdmQtKy8vrNPa9BRnwZh5UF4s1KTmSK0KUVLo3eff5BlQNNWDnFOouNpKfPKDnms9xynJjsMYjMaT/aFQ==
+  dependencies:
+    hashery "^1.4.0"
+    hookified "^1.15.0"
+
+"@keyv/serialize@^1.1.1":
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/@keyv/serialize/-/serialize-1.1.1.tgz#0c01dd3a3483882af7cf3878d4e71d505c81fc4a"
+  integrity sha512-dXn3FZhPv0US+7dtJsIi2R+c7qWYiReoEh5zUntWCf4oSpMNib8FDhSoed6m3QyZdx5hK7iLFkYk3rNxwt8vTA==
+
+"@langchain/core@^1.2.13":
+  version "1.2.13"
+  resolved "https://registry.yarnpkg.com/@langchain/core/-/core-1.2.13.tgz#4ea4eb0308a25af350f75de2fbf34aecb819177e"
+  integrity sha512-ADGTxZ84n3civruUX1LlTOdua/PDGoni2U6TmKTX7hvRU2Jlepu8vLJI4Wnwj45KUKhUCrW94Il12Q2bxE3e8A==
  dependencies:
    "@cfworker/json-schema" "^4.0.2"
    "@standard-schema/spec" "^1.1.0"
@@ -121,31 +152,26 @@
  resolved "https://registry.yarnpkg.com/@langchain/langgraph-checkpoint/-/langgraph-checkpoint-1.1.5.tgz#c793177f9afcce31a1e9922f317f88fec1254282"
  integrity sha512-BwDwl5VeTOh6CVuiIPgsUgfK51vTJDMSbFcSCUfjJWsl8/DPdK/mbv+ejxJstkSk/BlSPMP4JfXWcN6jD2ea2Q==

-"@langchain/langgraph-sdk@~1.10.0":
-  version "1.10.0"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.10.0.tgz#6ec1364a97caf615983161ae1f00b196897b9cd6"
-  integrity sha512-cPPkh+hMNgeOaGtJRrqs1AjZde45cG2+Ma9Sc10wz2RyvT8SKToCKS+VvkS18SsLajnmq6/FKVmthq6rnUVYOw==
+"@langchain/langgraph-sdk@~1.12.0":
+  version "1.12.0"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph-sdk/-/langgraph-sdk-1.12.0.tgz#b063a7eba0a66f51cbc841a824626a47eca1eec9"
+  integrity sha512-F3AOZjKZRUGmE3FzY+RaVZI6WzXOkwnuF7jqgto6rDPSnO9OdVdYGvwGDi3jjRGf5xLoDtX2dpsR9z5KptU+5A==
  dependencies:
    "@langchain/protocol" "^0.0.19"
    "@types/json-schema" "^7.0.15"
    p-queue "^9.0.1"
    p-retry "^7.1.1"

-"@langchain/langgraph@^1.4.13":
-  version "1.4.13"
-  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.4.13.tgz#168ab4f05c212fd5ab4b2816bcad2e963b345101"
-  integrity sha512-LO1ak6jNQ9jR13tm7Ay4Yh2/otrH7LNVUwWTAI7WJigVdW5Fb6LuYSZUzVn4S7sVSiyVFfnrUcDTd8c7eAzPrQ==
+"@langchain/langgraph@^1.4.18":
+  version "1.4.18"
+  resolved "https://registry.yarnpkg.com/@langchain/langgraph/-/langgraph-1.4.18.tgz#c8cc4ea734834262fdb00ae6a45a0849620e4fd2"
+  integrity sha512-yrMMJ9hk2NVMD2xU2WoVrgFawAU6s/RzEl/dX9BhlyxZHazo1wHY35z4K2BIBzTUh4z3giCzrUoqRAqW2CWpWg==
  dependencies:
    "@langchain/langgraph-checkpoint" "^1.1.5"
-    "@langchain/langgraph-sdk" "~1.10.0"
-    "@langchain/protocol" "^0.0.18"
+    "@langchain/langgraph-sdk" "~1.12.0"
+    "@langchain/protocol" "^0.0.19"
    "@standard-schema/spec" "1.1.0"

-"@langchain/protocol@^0.0.18":
-  version "0.0.18"
-  resolved "https://registry.yarnpkg.com/@langchain/protocol/-/protocol-0.0.18.tgz#6d96155e7263c958fbce6d4b7241b4725b72fbad"
-  integrity sha512-XW1egQtPfsGI41w2AMZNFZrUIwFSQHTjVMZs0OaTpCAvht/QLoaPN8FQcsysMVypOhupG28J29yOorrc70otBQ==
-
 "@langchain/protocol@^0.0.19":
  version "0.0.19"
  resolved "https://registry.yarnpkg.com/@langchain/protocol/-/protocol-0.0.19.tgz#7fe43fed115dc34b3b4c246e8d5283fbcbfab7b0"
@@ -171,35 +197,35 @@
  resolved "https://registry.yarnpkg.com/@tsconfig/recommended/-/recommended-1.0.13.tgz#269fce3ad04ca70b93269ff44cca81b950f542da"
  integrity sha512-sySRuBfMKyKO/j2ZAhR8kSembhjuPEV4Ra3AHtmWLq51+iGaudr45crPSzNC5b7/Ctrh9dfUpBuTlYrH6rM58Q==

-"@turbo/darwin-64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.10.12.tgz#719ac12ae47caf7b4be855d672582cdbfde177ea"
-  integrity sha512-9nKgKoF6ZOUsM+or0OtNf+TTJSfGvDNP7ZFv/ZGWVwOSCkumyctQiTeHwB4UNljHTnC41AqylgbunLDHoccNrA==
+"@turbo/darwin-64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-64/-/darwin-64-2.11.5.tgz#6ddc580c2b7d05e578ca1c06b3f61473f4b7b00e"
+  integrity sha512-KdY4y7BBjIisl+jAkb3FFaRjClGqHyaeHCcVcCT8LBzFFwUu6thgfxyRZAx0uL4KoxLmH+iOan8UhVf/aDDcaA==

-"@turbo/darwin-arm64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.10.12.tgz#ac2d3dde3a2407f8359ca2e3152690280cff2714"
-  integrity sha512-H4Elb1jqTZVeIC9bbcNwjSzemZ6RegoTOVHeuV5Osirt2Z8UguTyisMEkvZjPVZgMeN9J4ERZBFad40tFnkb7w==
+"@turbo/darwin-arm64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/darwin-arm64/-/darwin-arm64-2.11.5.tgz#a756c67bb828cd00d03e909769dd39453c1f1e69"
+  integrity sha512-ToZDGi2u410+TfRtC/O1/LpujGgvNJoRBZnwVXob7oO0+3OSlwIO3zofXKUvwQvlba7a8ZXPyCZwufjAXd7f0w==

-"@turbo/linux-64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.10.12.tgz#264a0ec88a1f69f93cf57dab20be1b4c50bf226c"
-  integrity sha512-lr7KIotukvjZwEXiFSYAeOH3BWzjFVBbSzTbv0fuGFsNukYyH0+g1hB5ecqnJkgkYU+KHEMG1edOhnjiKON1wQ==
+"@turbo/linux-64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-64/-/linux-64-2.11.5.tgz#b95c05218aebb06c06e5f991d48c55b78dc5e005"
+  integrity sha512-Ub2d/nAbdWLaSytcEaPp1wm/YuIvHEIqNrCRMI/UgOGyFdOhgxm8VyWPAJilQWRYxYVrqEUoy2K5S5K8SG50rA==

-"@turbo/linux-arm64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.10.12.tgz#3ee53d1f930d2bb65708e904971be0e765381e37"
-  integrity sha512-f0pZDTtvzB5SuNwuXBaKbZHUCMCukgc8nMlHEuvLmj91Fzec+MEbr3cAvGNor5htEDqZnO6Lxt9N/GPI/77oGA==
+"@turbo/linux-arm64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/linux-arm64/-/linux-arm64-2.11.5.tgz#c7a1d1a44c8c8dcff4b72fbafe9a5059c8fb668a"
+  integrity sha512-JQjmGxp724Wuft9FAxPMtmBur1CEdUyxJ+FVoIvKkgj63rXHl9PYCWrsU2tMjVi609XTQ3M8vZD9Yc9qVAVYrw==

-"@turbo/windows-64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.10.12.tgz#ac0a0b7794f9a541e68e930383f48747f7e648ab"
-  integrity sha512-SDOueJRjS/QcykWf2KCRtTLmIl5YMKsLbXkXQGhDwcTXvKXZiS5ih5lBl/gkwZIpYFjqA/rAlfMzlAFcVHNe0g==
+"@turbo/windows-64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-64/-/windows-64-2.11.5.tgz#60bdaaa7e8ba32f32623b31a1c75f6c3db400a0c"
+  integrity sha512-AFkbPmXNd8XgCi/66YEHR2bVl3gtusXyDihTIVEPAuSB+7ulLmJePvz1unWPVKLHdbCTTIdKq2mpJ1B1e3lJXw==

-"@turbo/windows-arm64@2.10.12":
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.10.12.tgz#50eb6c20a20d0aab216d2b6aa13cc3100ea44106"
-  integrity sha512-0i0mVUa4kKk+/B3RwEwPMf9CB+T7ul56hn5FFHNA4VUNTOoLBEd6aNf3FaKfCatDNZ6cicCEf6if9QUTVyzzcA==
+"@turbo/windows-arm64@2.11.5":
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/@turbo/windows-arm64/-/windows-arm64-2.11.5.tgz#18bd5a0ad30c4e094995786bd78916b6de6b5c1c"
+  integrity sha512-52ziXYP3snGOxjv19xA3WL1WDKv9Q6uDAa/7EKIR5j4hocMlYURkrOHbJ2ZZI+VfPU5MwKpcGeRfHxHJu7Y/Pw==

 "@types/esrecurse@^4.3.1":
  version "4.3.1"
@@ -221,110 +247,110 @@
  resolved "https://registry.yarnpkg.com/@types/json5/-/json5-0.0.29.tgz#ee28707ae94e11d2b827bcbe5270bcea7f3e71ee"
  integrity sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==

-"@typescript-eslint/eslint-plugin@^8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.68.0.tgz#a8fbdb1cf49aafaf16071b646daad890151bd149"
-  integrity sha512-WASHDpCm6qO5jj9g1a+8NiW5+GCkAyLReR56/4VruYmNgfUmqpxOfZ2Yfb8xGfJPWv5Qi6LSD8sXdces3vbp/Q==
+"@typescript-eslint/eslint-plugin@^8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/eslint-plugin/-/eslint-plugin-8.70.1.tgz#d404bac4cb04e4dcd20086e46e13c952bd0771e0"
+  integrity sha512-nDNrUQ/4ruSNYbu749TRY7cfrzPtoLHEXSNBI8aaNY32LlZCajixqRf3FqcKC4p5Cam4VOHYx/t+i5+nKXvrqA==
  dependencies:
    "@eslint-community/regexpp" "^4.12.2"
-    "@typescript-eslint/scope-manager" "8.68.0"
-    "@typescript-eslint/type-utils" "8.68.0"
-    "@typescript-eslint/utils" "8.68.0"
-    "@typescript-eslint/visitor-keys" "8.68.0"
+    "@typescript-eslint/scope-manager" "8.70.1"
+    "@typescript-eslint/type-utils" "8.70.1"
+    "@typescript-eslint/utils" "8.70.1"
+    "@typescript-eslint/visitor-keys" "8.70.1"
    ignore "^7.0.5"
    natural-compare "^1.4.0"
    ts-api-utils "^2.5.0"

-"@typescript-eslint/parser@^8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.68.0.tgz#61de31481354c50457bc9621a7ed746779f09ee7"
-  integrity sha512-fHq2VC1kpyYfvEcbiMjOpySY4WS7voEp89yAThrHRX5sm9j2lzYppCb2umFMEed4fWcyeLjHxrz0mpjNBaBxMQ==
+"@typescript-eslint/parser@^8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/parser/-/parser-8.70.1.tgz#6c99b7b954efc05dae179001c8b477d1a8948dcf"
+  integrity sha512-nO974WLllwhSFWQXnMLj6nDGa8f0khKEz1JzpPJ1u7Vm/4X1X6ZHajpoknU4bb41vJyMB0HHVyS2GqdhWfIXZw==
  dependencies:
-    "@typescript-eslint/scope-manager" "8.68.0"
-    "@typescript-eslint/types" "8.68.0"
-    "@typescript-eslint/typescript-estree" "8.68.0"
-    "@typescript-eslint/visitor-keys" "8.68.0"
+    "@typescript-eslint/scope-manager" "8.70.1"
+    "@typescript-eslint/types" "8.70.1"
+    "@typescript-eslint/typescript-estree" "8.70.1"
+    "@typescript-eslint/visitor-keys" "8.70.1"
    debug "^4.4.3"

-"@typescript-eslint/project-service@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.68.0.tgz#ea4b2869f59165c420cd7a4bbebc38039794e8cc"
-  integrity sha512-5GQtWZCXFcFYux955pvoS02WLc49pXNlvIxocKjS0clvwo3in1RdlzVKyiqQH9vE5AKWFLTaUgeQkOrTS+0Qxw==
+"@typescript-eslint/project-service@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/project-service/-/project-service-8.70.1.tgz#d5635594cc8a573f0e15a772b1704e93a00134c1"
+  integrity sha512-62xOgboPfwc3/IgPSX/W6oQR3ZbF04194FPGUGH8HL8iLFHbt/456/8Ph1wLNUgVF+s94FlHoipBsz+v7+LMnA==
  dependencies:
-    "@typescript-eslint/tsconfig-utils" "^8.68.0"
-    "@typescript-eslint/types" "^8.68.0"
+    "@typescript-eslint/tsconfig-utils" "^8.70.1"
+    "@typescript-eslint/types" "^8.70.1"
    debug "^4.4.3"

-"@typescript-eslint/scope-manager@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.68.0.tgz#e5a13a1159497faeab4e48279bf07576045b1499"
-  integrity sha512-T5eXpcaJNg8bhjHJ8Rjp68Vq/QBteYtTKY8TZqVNPaUbuz0f6jI9t6aDkylwvalpAB9XTTFeFOjrjXAZ3YvmVA==
+"@typescript-eslint/scope-manager@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/scope-manager/-/scope-manager-8.70.1.tgz#0feeae4da2d279b960cdbfe5e0a02fbf1195e93f"
+  integrity sha512-Pa0EeSeAusQc1WbjQMac+YfenewYTBu0KjgYvkUKwhXaHUKbFog23Dm/rp0DX/6tyYOQ3Xl1a+3EcFNZynGHCw==
  dependencies:
-    "@typescript-eslint/types" "8.68.0"
-    "@typescript-eslint/visitor-keys" "8.68.0"
+    "@typescript-eslint/types" "8.70.1"
+    "@typescript-eslint/visitor-keys" "8.70.1"

-"@typescript-eslint/tsconfig-utils@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.68.0.tgz#594d7a3c5952055b3c431fc563ca7fd1defcce18"
-  integrity sha512-F7zrGQfiJHojPwi8vhxZQC1tWtJzvL74cK/nqri2lk8YUXvYaYwl263xOJ69jDWPUk1hmcdoayFwk9lX09npVw==
+"@typescript-eslint/tsconfig-utils@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.70.1.tgz#e9353a6e5f3498a29b40946ca3e11f6166fef09e"
+  integrity sha512-jumze1fPI+sDOaM2TWGQdn39PDxTr7TZGeuyLkAbNyx2vtMT3uRnVKChN0hfht5V2TugphJzF6bYXvBcE09qqg==

-"@typescript-eslint/tsconfig-utils@^8.68.0":
-  version "8.69.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.69.0.tgz#d3b0ccc781ab252a90a0b3989b9d1eb85ab59469"
-  integrity sha512-xNqK7YTDZsLniQMV/4rpFR8Z5JlqeRvVjuG1YgF/mdPVH84HSD19L8CczMA0qg2RfwEV231GHH3VnToJDo4MfQ==
+"@typescript-eslint/tsconfig-utils@^8.70.1":
+  version "8.71.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/tsconfig-utils/-/tsconfig-utils-8.71.0.tgz#83a69c9a514af8f5ff099cc6c0d609c273e8f039"
+  integrity sha512-Z1UlWHADEK2Mlb9NpWfDeSjqoZ5EyrOv4R3eQpbkzqn/EwaIdOpXXupEA1+0ZIOSJSZZDBHG0BrQyN8zUG6Pwg==

-"@typescript-eslint/type-utils@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.68.0.tgz#8f3e838dbd740909db27053857468cd037b00220"
-  integrity sha512-X77zqoY1EjeWGs/0JNxeaMfp5C5lIz4Tw8y66F1Ne8Faq6g424sBNYM6xBAqElfGZPLpWS+CZAp0DXyKDzWiHg==
+"@typescript-eslint/type-utils@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/type-utils/-/type-utils-8.70.1.tgz#6ea36f2c7dc0776c1c8e1c380b4896f00bc4c27f"
+  integrity sha512-7zKTnyvaVWqzLZHPFQtX1hVHqgkMC+WebPWakNCSyrQVbIP1AM0L0TlBZtACldIRb6PptI8Odk+jyZ5kP3B1VA==
  dependencies:
-    "@typescript-eslint/types" "8.68.0"
-    "@typescript-eslint/typescript-estree" "8.68.0"
-    "@typescript-eslint/utils" "8.68.0"
+    "@typescript-eslint/types" "8.70.1"
+    "@typescript-eslint/typescript-estree" "8.70.1"
+    "@typescript-eslint/utils" "8.70.1"
    debug "^4.4.3"
    ts-api-utils "^2.5.0"

-"@typescript-eslint/types@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.68.0.tgz#3f9d4e62fbe5728f09403cdc7b4d58af842ac1af"
-  integrity sha512-9RnpsGJjrAllCMefGVVsImJM24YurhC0Q1h4UbvivtvOqXmR/vEJge2OoE++z9m6hyg8T1Q8t5SNT6tHSbrxcg==
+"@typescript-eslint/types@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.70.1.tgz#2022b9d07d057174eba25b9bbd289641d262a196"
+  integrity sha512-Dm1ypdhhrGCTyyehxElhgJ6kgk8MVCv5qXdoOVqPr1uqk42jX8KjrZqhROvdShczA8qrDoYiOWn1ykWlx2k81Q==

-"@typescript-eslint/types@^8.68.0":
-  version "8.69.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.69.0.tgz#5d9ad3f707c2e4f70a2db540031104df3e63bcf5"
-  integrity sha512-K3VrubUPhlo9VDBS6QdI8YB5j7ClpqLRdefcz6PFrhnwicehBweqQ9Evhl4l+FYz0HdDmMqIiSX0aldGRYtDCA==
+"@typescript-eslint/types@^8.70.1":
+  version "8.71.0"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/types/-/types-8.71.0.tgz#a230a121e71665060afe27d1f1ad110371f9451e"
+  integrity sha512-cJ4OoxPGWvFnBTnSZyaU+qJzGTqPTGJY+gDchj6cRyLRdmIdt4rcsE4twj+zPfrNiWuVi38wijHzShL++Z9atQ==

-"@typescript-eslint/typescript-estree@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.68.0.tgz#bf4165029825138ac27231a3ff02923ecd977f38"
-  integrity sha512-OKKsD0tYmoNiU5PW2zehO1yO56jYOm1ShYlxon/Z0SJNidAkdVg86eg9ruRuoXf8xfnuWZGbwDsStkoXbZtIIA==
+"@typescript-eslint/typescript-estree@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/typescript-estree/-/typescript-estree-8.70.1.tgz#ced48fee6f7043835d2edfed9786ae74813a3c99"
+  integrity sha512-TU8PwyGN0PQJUcE96mw8eCQ44SmxGdQlJmlWakHaHQ15eIuuvye5yNtmh/i6oS88jzXVQB71xdNkbkB/fMwL0g==
  dependencies:
-    "@typescript-eslint/project-service" "8.68.0"
-    "@typescript-eslint/tsconfig-utils" "8.68.0"
-    "@typescript-eslint/types" "8.68.0"
-    "@typescript-eslint/visitor-keys" "8.68.0"
+    "@typescript-eslint/project-service" "8.70.1"
+    "@typescript-eslint/tsconfig-utils" "8.70.1"
+    "@typescript-eslint/types" "8.70.1"
+    "@typescript-eslint/visitor-keys" "8.70.1"
    debug "^4.4.3"
    minimatch "^10.2.2"
    semver "^7.7.3"
    tinyglobby "^0.2.15"
    ts-api-utils "^2.5.0"

-"@typescript-eslint/utils@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.68.0.tgz#00547f2c8de8aca2a3c21752a9711f73206fd36d"
-  integrity sha512-PB5gJMMOg0Q5P1tsgWtEAqQacJXq0qEqRHDX/YJ4FaTMLfZPpHB3gjl2EJuiZyPABxmj4ZQYiY9m1bdAJ5y7tQ==
+"@typescript-eslint/utils@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/utils/-/utils-8.70.1.tgz#6a97887cee702df513692f5cdc7f79baeef48e02"
+  integrity sha512-Esgul8MsnKnRLdYU2Eb2cRV9bS5HJYtKj1ByJnOzzG2M58DGdSUQ1jUuILxipqcpB2h9WLrbD5GijIWUjX/Tqw==
  dependencies:
    "@eslint-community/eslint-utils" "^4.9.1"
-    "@typescript-eslint/scope-manager" "8.68.0"
-    "@typescript-eslint/types" "8.68.0"
-    "@typescript-eslint/typescript-estree" "8.68.0"
+    "@typescript-eslint/scope-manager" "8.70.1"
+    "@typescript-eslint/types" "8.70.1"
+    "@typescript-eslint/typescript-estree" "8.70.1"

-"@typescript-eslint/visitor-keys@8.68.0":
-  version "8.68.0"
-  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.68.0.tgz#78db3c9bb258a0309d9e2b1b617127c3a8fb1f54"
-  integrity sha512-YR65gGdGvTUAWLldC3xLOvOzamdGzB4A5/N8rehEaHs3Zvoe39BhgY+u0SPch1OvrVTfLcc55wsSgK2NcnTS/A==
+"@typescript-eslint/visitor-keys@8.70.1":
+  version "8.70.1"
+  resolved "https://registry.yarnpkg.com/@typescript-eslint/visitor-keys/-/visitor-keys-8.70.1.tgz#b4cde0ed16982bd963a6310fcae554f59fd14124"
+  integrity sha512-Vwj9lUIW5Xq3wQ9w6gv3R86g1hMK8f2zNOdGTAgeXUMMXFK78G9ruCjjqutHMNJc0+CH7LYRnHeUB9IT8wFmcw==
  dependencies:
-    "@typescript-eslint/types" "8.68.0"
+    "@typescript-eslint/types" "8.70.1"
    eslint-visitor-keys "^5.0.0"

 "@typescript/typescript-aix-ppc64@7.0.2":
@@ -569,6 +595,17 @@ brace-expansion@^5.0.8:
  dependencies:
    balanced-match "^4.0.2"

+cacheable@^2.5.0:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/cacheable/-/cacheable-2.5.0.tgz#d142d41043e5a865f6053cc70ef4e3ad068bd5ce"
+  integrity sha512-60cyAOytib/OzBw1JNSoSV/boK1AtHryDIjvVBk7XbN4ugfkM3+Sry7fEjNgPMGgOjuaZPAp8ruZ0Cxafwyq9g==
+  dependencies:
+    "@cacheable/memory" "^2.2.0"
+    "@cacheable/utils" "^2.5.0"
+    hookified "^1.15.0"
+    keyv "^5.6.0"
+    qified "^0.10.1"
+
 call-bind-apply-helpers@^1.0.0, call-bind-apply-helpers@^1.0.1, call-bind-apply-helpers@^1.0.2:
  version "1.0.2"
  resolved "https://registry.yarnpkg.com/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz#4b5428c222be985d79c3d82657479dbe0b59b2d6"
@@ -886,17 +923,17 @@ 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@^10.9.1:
-  version "10.9.1"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.9.1.tgz#409da5c41a5536d5a849f8555a18ca7ef1eb963b"
-  integrity sha512-9VaAkDURekixUQJy0oJYl2DcN6oKMfxay7XzaGYAWQwsb6qfKf+x76R2k1L8kb1boc+FyCAaTA9GmiKaaiaF+A==
+eslint@^10.11.0:
+  version "10.11.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-10.11.0.tgz#304d1591b7c6a327e3f64b4f550f99fda160ae20"
+  integrity sha512-P7a6UEEqb9G95MYAtqkmsTbVXIYyzIfl6NGOIJk162PaahFxFyeGcrlXYFSiagECg4sEm8IseJdZBKR3rx6MsQ==
  dependencies:
    "@eslint-community/eslint-utils" "^4.8.0"
    "@eslint-community/regexpp" "^4.12.2"
    "@eslint/config-array" "^0.23.5"
    "@eslint/config-helpers" "^0.7.0"
    "@eslint/core" "^1.2.1"
-    "@eslint/plugin-kit" "^0.7.2"
+    "@eslint/plugin-kit" "^0.7.3"
    "@humanfs/node" "^0.16.6"
    "@humanwhocodes/module-importer" "^1.0.1"
    "@humanwhocodes/retry" "^0.4.2"
@@ -911,7 +948,7 @@ eslint@^10.9.1:
    esquery "^1.7.0"
    esutils "^2.0.2"
    fast-deep-equal "^3.1.3"
-    file-entry-cache "^8.0.0"
+    file-entry-cache "11.1.5 || >11.1.6 <12"
    find-up "^5.0.0"
    glob-parent "^6.0.2"
    ignore "^5.2.0"
@@ -999,12 +1036,12 @@ fdir@^6.5.0:
  resolved "https://registry.yarnpkg.com/fdir/-/fdir-6.5.0.tgz#ed2ab967a331ade62f18d077dae192684d50d350"
  integrity sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg==

-file-entry-cache@^8.0.0:
-  version "8.0.0"
-  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-8.0.0.tgz#7787bddcf1131bffb92636c69457bbc0edd6d81f"
-  integrity sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ==
+"file-entry-cache@11.1.5 || >11.1.6 <12":
+  version "11.1.5"
+  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-11.1.5.tgz#c8210eb055de63e68685ccfb6a017e386d4577d0"
+  integrity sha512-+PFTHITI08JIGhnNpGNI8T8inUpgZfk3GNEqfT9R2zZV2iFXg3CvqzSl/uEhs7TSGujYRELEANyDvS8Fj7+S7Q==
  dependencies:
-    flat-cache "^4.0.0"
+    flat-cache "^6.1.23"

 find-up@^5.0.0:
  version "5.0.0"
@@ -1014,18 +1051,19 @@ find-up@^5.0.0:
    locate-path "^6.0.0"
    path-exists "^4.0.0"

-flat-cache@^4.0.0:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-4.0.1.tgz#0ece39fcb14ee012f4b0410bd33dd9c1f011127c"
-  integrity sha512-f7ccFPK3SXFHpx15UIGyRJ/FJQctuKZ0zVuN3frBo4HnK3cay9VEW0R6yPYFHC0AgqhukPzKjq22t5DmAyqGyw==
+flat-cache@^6.1.23:
+  version "6.1.23"
+  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-6.1.23.tgz#735dc888c271868d7301b3bbb8edba5028afb61d"
+  integrity sha512-f++BY9pTk+983xK1FLzlLpmM0i0z+jHmx3QESGkURMXujQZz1k5wzwX6hjnQ8goaD0B+sYnDK1yZ6MTyZfUaqA==
  dependencies:
-    flatted "^3.2.9"
-    keyv "^4.5.4"
+    cacheable "^2.5.0"
+    flatted "^3.4.2"
+    hookified "^1.15.0"

-flatted@^3.2.9:
-  version "3.4.2"
-  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.4.2.tgz#f5c23c107f0f37de8dbdf24f13722b3b98d52726"
-  integrity sha512-PjDse7RzhcPkIJwy5t7KPWQSZ9cAbzQXcafsetQoD7sOJRQlGikNbx7yZp2OotDnJyrDcbyRq3Ttb18iYOqkxA==
+flatted@^3.4.2:
+  version "3.4.4"
+  resolved "https://registry.yarnpkg.com/flatted/-/flatted-3.4.4.tgz#aeeca2a506303f0cee61c59e6c9f2a88d2f29fc6"
+  integrity sha512-5+ybhBZANEJxaH3X5evAFatUxLfEHSr7n6kYJ+1Qd0mUqr4eu9gIf6GDbWHf8RJijHrjjO8G+la14SlL2SeS1Q==

 for-each@^0.3.3, for-each@^0.3.5:
  version "0.3.5"
@@ -1145,6 +1183,13 @@ has-tostringtag@^1.0.2:
  dependencies:
    has-symbols "^1.0.3"

+hashery@^1.4.0, hashery@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/hashery/-/hashery-1.5.1.tgz#4ba82ad54911ac617467870845d57a9fe508a400"
+  integrity sha512-iZyKG96/JwPz1N55vj2Ie2vXbhu440zfUfJvSwEqEbeLluk7NnapfGqa7LH0mOsnDxTF85Mx8/dyR6HfqcbmbQ==
+  dependencies:
+    hookified "^1.15.0"
+
 hasown@^2.0.2:
  version "2.0.2"
  resolved "https://registry.yarnpkg.com/hasown/-/hasown-2.0.2.tgz#003eaf91be7adc372e84ec59dc37252cedb80003"
@@ -1152,6 +1197,16 @@ hasown@^2.0.2:
  dependencies:
    function-bind "^1.1.2"

+hookified@^1.15.0, hookified@^1.15.1:
+  version "1.15.1"
+  resolved "https://registry.yarnpkg.com/hookified/-/hookified-1.15.1.tgz#b1fafeaa5489cdc29cb85546a8f837ed4ffbbcb6"
+  integrity sha512-MvG/clsADq1GPM2KGo2nyfaWVyn9naPiXrqIe4jYjXNZQt238kWyOGrsyc/DmRAQ+Re6yeo6yX/yoNCG5KAEVg==
+
+hookified@^2.1.1:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/hookified/-/hookified-2.2.0.tgz#1d024ac1668973dd5bcc4a96ab9ccdb7639ef8d4"
+  integrity sha512-p/LgFzRN5FeoD3DLS6bkUapeye6E4SI6yJs6KetENd18S+FBthqYq2amJUWpt5z0EQwwHemidjY5OqJGEKm5uA==
+
 ignore@^5.2.0:
  version "5.3.2"
  resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.3.2.tgz#3cd40e729f3643fd87cb04e50bf0eb722bc596f5"
@@ -1390,18 +1445,13 @@ js-tiktoken@^1.0.12:
  dependencies:
    base64-js "^1.5.1"

-js-yaml@^4.3.0:
+js-yaml@^4.3.2:
  version "4.3.2"
  resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-4.3.2.tgz#8e44fb14a2643c59726bb15787b5f1512cb3d3fb"
  integrity sha512-SFNOvSJ+Dgf/9An904Yx+CgSlIPCkIpao4qo51lpee25TIRejdH3rhR4EZMGoNx3/TP3O+wzWuiTFl4sqbltzA==
  dependencies:
    argparse "^2.0.1"

-json-buffer@3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/json-buffer/-/json-buffer-3.0.1.tgz#9338802a30d3b6605fbe0613e094008ca8c05a13"
-  integrity sha512-4bV5BfR2mqfQTJm+V5tPPdf+ZpuhiIvTuAB5g8kcrXOZpTT/QwwVRWBywX1ozr6lEuPdbHxwaJlm9G6mI2sfSQ==
-
 json-schema-traverse@^0.4.1:
  version "0.4.1"
  resolved "https://registry.yarnpkg.com/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz#69f6a87d9513ab8bb8fe63bdb0979c448e684660"
@@ -1419,12 +1469,12 @@ json5@^1.0.2:
  dependencies:
    minimist "^1.2.0"

-keyv@^4.5.4:
-  version "4.5.4"
-  resolved "https://registry.yarnpkg.com/keyv/-/keyv-4.5.4.tgz#a879a99e29452f942439f2a405e3af8b31d4de93"
-  integrity sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==
+keyv@^5.6.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/keyv/-/keyv-5.6.0.tgz#03044074c6b4d072d0a62c7b9fa649537baf0105"
+  integrity sha512-CYDD3SOtsHtyXeEORYRx2qBtpDJFjRTGXUtmNEMGyzYOKj1TE3tycdlho7kA1Ufx9OYWZzg52QFBGALTirzDSw==
  dependencies:
-    json-buffer "3.0.1"
+    "@keyv/serialize" "^1.1.1"

 "langsmith@>=0.5.0 <1.0.0":
  version "0.7.1"
@@ -1657,16 +1707,23 @@ prettier-linter-helpers@^1.0.1:
  dependencies:
    fast-diff "^1.1.2"

-prettier@^3.9.6:
-  version "3.9.6"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.9.6.tgz#b3ea5146515d40fc53f18aa63f74dfab1e10dbf6"
-  integrity sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==
+prettier@^3.9.9:
+  version "3.9.9"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.9.9.tgz#09b826918c91cd4cbc80e0cbd1d2a922ff04f233"
+  integrity sha512-Z/CJHIkdujO/OtN7nXUii0Rf3VT5SRuhjBA82Xvu2XhBUgX3nhP67T0LHceBdQLex7OOFGTox+Q5Yg8Jk2Qivg==

 punycode@^2.1.0:
  version "2.3.1"
  resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.3.1.tgz#027422e2faec0b25e1549c3e1bd8309b9133b6e5"
  integrity sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==

+qified@^0.10.1:
+  version "0.10.1"
+  resolved "https://registry.yarnpkg.com/qified/-/qified-0.10.1.tgz#0640bf21bbe6ca540db290ad8f5fde4d870b8bda"
+  integrity sha512-+Owyggi9IxT1ePKGafcI87ubSmxol6smwJ+RAHDQlx9+9cPwFWDiKFFCPuWhr9ignlGpZ9vDQLw67N4dcTVFEA==
+  dependencies:
+    hookified "^2.1.1"
+
 reflect.getprototypeof@^1.0.6, reflect.getprototypeof@^1.0.9:
  version "1.0.10"
  resolved "https://registry.yarnpkg.com/reflect.getprototypeof/-/reflect.getprototypeof-1.0.10.tgz#c629219e78a3316d8b604c765ef68996964e7bf9"
@@ -1913,17 +1970,17 @@ tsconfig-paths@^3.15.0:
    minimist "^1.2.6"
    strip-bom "^3.0.0"

-turbo@^2.10.12:
-  version "2.10.12"
-  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.10.12.tgz#22f552bd88182d58365960a02e5f45e628fb965b"
-  integrity sha512-AswgMPnpOoaVZHrrSBejETzEbuIA69OVGwfkHwfrY0A23VjWXBANzgq9+OymWOHAIArB7D1+1z498WY8fGg1Jw==
+turbo@^2.11.5:
+  version "2.11.5"
+  resolved "https://registry.yarnpkg.com/turbo/-/turbo-2.11.5.tgz#e7223abd0555b978d3efe1b00ea9a98f43afb7ab"
+  integrity sha512-qLXheqz3TUvJpHIV6MUBwkNkvwKxMVG/QsimyiKT9DfNWPHJ294G/i5nDaH+fbHJt3UH7orubNNxAqYkbUNGAQ==
  optionalDependencies:
-    "@turbo/darwin-64" "2.10.12"
-    "@turbo/darwin-arm64" "2.10.12"
-    "@turbo/linux-64" "2.10.12"
-    "@turbo/linux-arm64" "2.10.12"
-    "@turbo/windows-64" "2.10.12"
-    "@turbo/windows-arm64" "2.10.12"
+    "@turbo/darwin-64" "2.11.5"
+    "@turbo/darwin-arm64" "2.11.5"
+    "@turbo/linux-64" "2.11.5"
+    "@turbo/linux-arm64" "2.11.5"
+    "@turbo/windows-64" "2.11.5"
+    "@turbo/windows-arm64" "2.11.5"

 type-check@^0.4.0, type-check@~0.4.0:
  version "0.4.0"
@@ -1 +1 @@
-__version__ = "0.4.32"
+__version__ = "0.4.33"
@@ -6,6 +6,7 @@ import re
 import shlex
 import textwrap
 from collections import Counter
+from collections.abc import Iterable
 from typing import Literal, NamedTuple

 import click
@@ -36,6 +37,10 @@ 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"(?<!&)&(?:&&)*(?!&)")
+_GIT_HTTP_AUTHORITY_RES = (
+    re.compile(r"git\+https?://(?P<authority>[^/\s\"']+)", re.I),
+    re.compile(r"\bgit\s*=\s*[\"']https?://(?P<authority>[^/\s\"']+)", re.I),
+)
 _API_VERSION_PATTERN = re.compile(
    r"^(?P<major>\d+)"
    r"(?:\.(?P<minor>\d+))?"
@@ -78,6 +83,62 @@ def has_disallowed_build_command_content(command: str) -> bool:
    return False


+def _has_git_http_url_userinfo(dependency: str) -> bool:
+    """Check whether a Git HTTP URL contains userinfo."""
+    return any(
+        "@" in match.group("authority")
+        for pattern in _GIT_HTTP_AUTHORITY_RES
+        for match in pattern.finditer(dependency)
+    )
+
+
+def _validate_git_http_url_userinfo(
+    values: Iterable[str], *, source: pathlib.Path | None = None
+) -> None:
+    """Reject credential-bearing Git HTTP URLs without echoing their values."""
+    if not any(_has_git_http_url_userinfo(value) for value in values):
+        return
+    message = (
+        "Git dependency URLs must not contain credentials or other URL "
+        "userinfo because generated Dockerfiles and image layers can retain "
+        "them. Use a credential-free Git URL and provide short-lived "
+        "credentials through your build environment's secret-backed Git "
+        "credential helper."
+    )
+    if source is not None:
+        message += f" Found in: {source}"
+    raise click.UsageError(message)
+
+
+def _validate_git_http_url_userinfo_files(paths: Iterable[pathlib.Path]) -> None:
+    """Reject credential-bearing Git HTTP URLs in dependency files."""
+    for path in paths:
+        path = path.resolve()
+        if not path.is_file():
+            continue
+        try:
+            contents = path.read_text(encoding="utf-8", errors="replace")
+        except OSError:
+            raise click.UsageError(
+                f"Could not inspect dependency file for embedded credentials: {path}"
+            ) from None
+        _validate_git_http_url_userinfo([contents], source=path)
+
+
+def _validate_local_dependency_files(config_path: pathlib.Path, config: Config) -> None:
+    """Validate dependency files copied into a non-uv Python image."""
+    paths: list[pathlib.Path] = []
+    for dependency in config["dependencies"]:
+        if not isinstance(dependency, str) or not dependency.startswith("."):
+            continue
+        root = (config_path.parent / dependency).resolve()
+        paths.extend(
+            root / name
+            for name in ("requirements.txt", "pyproject.toml", "setup.py", "setup.cfg")
+        )
+    _validate_git_http_url_userinfo_files(paths)
+
+
 MIN_PYTHON_VERSION = "3.11"
 DEFAULT_PYTHON_VERSION = "3.11"

@@ -320,7 +381,9 @@ def _get_source_kind(config: Config) -> str | None:
    return kind if isinstance(kind, str) else None


-def validate_config(config: Config) -> Config:
+def validate_config(
+    config: Config, *, source_path: pathlib.Path | None = None
+) -> Config:
    """Validate a configuration dictionary."""

    graphs = config.get("graphs", {})
@@ -415,6 +478,15 @@ def validate_config(config: Config) -> Config:
                '  "source": {"kind": "uv", "root": ".."}'
            )

+    _validate_git_http_url_userinfo(
+        (
+            dependency
+            for dependency in config["dependencies"]
+            if isinstance(dependency, str)
+        ),
+        source=source_path,
+    )
+
    source = config.get("source")
    source_kind = _get_source_kind(config)
    if source is not None and not isinstance(source, dict):
@@ -609,7 +681,7 @@ def validate_config_file(config_path: pathlib.Path) -> Config:
    """Load and validate a configuration file."""
    with open(config_path) as f:
        config = json.load(f)
-    validated = validate_config(config)
+    validated = validate_config(config, source_path=config_path.resolve())
    # Enforce the package.json doesn't enforce an
    # incompatible Node.js version
    if validated.get("node_version"):
@@ -1280,6 +1352,7 @@ def python_config_to_docker(
            api_version=api_version,
            build_tools_to_uninstall=build_tools_to_uninstall,
        )
+    _validate_local_dependency_files(config_path, config)
    if pip_installer == "auto":
        if _image_supports_uv(base_image):
            pip_installer = "uv"
@@ -1490,7 +1563,18 @@ def node_config_to_docker(
 ) -> tuple[str, dict[str, str]]:
    # Calculate paths for monorepo support
    install_root = (
-        pathlib.Path(build_context).resolve() if build_context else config_path.parent
+        pathlib.Path(build_context).resolve()
+        if build_context
+        else config_path.parent.resolve()
+    )
+    config_root = config_path.parent.resolve()
+    dependency_roots = (
+        (install_root, config_root) if install_root != config_root else (install_root,)
+    )
+    _validate_git_http_url_userinfo_files(
+        root / name
+        for root in dependency_roots
+        for name in ("package.json", "package-lock.json", "yarn.lock", "pnpm-lock.yaml")
    )
    install_cmd = install_command or _get_node_pm_install_cmd(install_root)
    if build_context:
@@ -32,7 +32,7 @@ from langgraph_cli.host_backend import (
    HostBackendError,
    SourceName,
 )
-from langgraph_cli.image_reference import ImageReference
+from langgraph_cli.image_reference import DIGEST_SEPARATOR, ImageReference
 from langgraph_cli.progress import Progress
 from langgraph_cli.util import warn_non_wolfi_distro

@@ -624,6 +624,41 @@ def format_deployments_table(deployments: Sequence[dict[str, object]]) -> str:
    return "\n".join(lines)


+def _extract_listener_namespaces(listener: dict[str, object]) -> str:
+    compute_config = listener.get("compute_config")
+    namespaces = (
+        compute_config.get("k8s_namespaces")
+        if isinstance(compute_config, dict)
+        else None
+    )
+    if isinstance(namespaces, list) and namespaces:
+        return ", ".join(str(namespace) for namespace in namespaces)
+    return "-"
+
+
+def format_listeners_table(listeners: Sequence[dict[str, object]]) -> str:
+    headers = ("Listener ID", "Compute ID", "Namespaces")
+    rows = [
+        (
+            str(listener.get("id", "-") or "-"),
+            str(listener.get("compute_id", "-") or "-"),
+            _extract_listener_namespaces(listener),
+        )
+        for listener in listeners
+    ]
+    widths = [
+        max(len(headers[index]), *(len(row[index]) for row in rows))
+        for index in range(len(headers))
+    ]
+
+    def format_row(row: Sequence[str]) -> str:
+        return "  ".join(value.ljust(widths[index]) for index, value in enumerate(row))
+
+    lines = [format_row(headers), format_row(tuple("-" * width for width in widths))]
+    lines.extend(format_row(row) for row in rows)
+    return "\n".join(lines)
+
+
 def format_revisions_table(revisions: Sequence[dict[str, object]]) -> str:
    headers = ("Revision ID", "Status", "Created At")
    latest_deployed_seen = False
@@ -1544,9 +1579,9 @@ def _ensure_customer_registry_source(existing: ExistingDeployment) -> None:
    if existing.source != _CUSTOMER_REGISTRY_SOURCE:
        raise click.UsageError(
            f"Deployment {existing.id} was not created from an external image "
-            "and cannot be updated with --push-to. Run without --push-to to keep "
-            "its current build mode, or use a different --name to create a new "
-            "deployment."
+            "and cannot be updated with --push-to or --image-uri. Run without "
+            "either flag to keep its current build mode, or use a different "
+            "--name to create a new deployment."
        )


@@ -1599,9 +1634,22 @@ class RemoteBuildSource:


@dataclass(frozen=True, slots=True)
-class CustomerRegistrySource:
+class BuildAndPush:
    reference: ImageReference
    prebuilt_image: str | None
+
+
+@dataclass(frozen=True, slots=True)
+class PublishedImage:
+    image_uri: str
+
+
+ImageSource = BuildAndPush | PublishedImage
+
+
+@dataclass(frozen=True, slots=True)
+class CustomerRegistrySource:
+    image: ImageSource
    requested_placement: RequestedPlacement

    def run(self, ctx: DeployContext) -> DeployOutcome:
@@ -1686,16 +1734,22 @@ class CustomerRegistrySource:
        )

    def _publish(self, ctx: DeployContext, step: int) -> tuple[str, int]:
-        image = str(self.reference)
+        if isinstance(self.image, PublishedImage):
+            return self.image.image_uri, step
+        image = str(self.image.reference)
        with Runner() as runner:
-            if self.prebuilt_image:
-                _log_deploy_step(step, f"Validating image {self.prebuilt_image}")
+            if self.image.prebuilt_image:
+                _log_deploy_step(step, f"Validating image {self.image.prebuilt_image}")
                _validate_prebuilt_image(
-                    runner, self.prebuilt_image, verbose=ctx.verbose
+                    runner, self.image.prebuilt_image, verbose=ctx.verbose
                )
                runner.run(
                    subp_exec(
-                        "docker", "tag", self.prebuilt_image, image, verbose=ctx.verbose
+                        "docker",
+                        "tag",
+                        self.image.prebuilt_image,
+                        image,
+                        verbose=ctx.verbose,
                    )
                )
            else:
@@ -1733,20 +1787,35 @@ def _push_reference(push_to: str, tag: str | None) -> ImageReference:
    return reference.with_tag(normalize_image_tag(tag or _DEFAULT_IMAGE_TAG))


+def _validate_image_uri(image_uri: str) -> str:
+    value = image_uri.strip()
+    if not value:
+        raise click.UsageError("--image-uri must not be empty.")
+    if DIGEST_SEPARATOR not in value:
+        raise click.UsageError(
+            "--image-uri must pin a digest, e.g. "
+            f"repository{DIGEST_SEPARATOR}<sha256 hex>. Kubernetes can cache "
+            "images by tag, so redeploying a mutable tag may silently keep "
+            "running the previous image."
+        )
+    return value
+
+
 def _select_source(
    *,
    push_to: str | None,
    image: str | None,
+    image_uri: str | None,
    image_name: str | None,
    tag: str | None,
    remote_build_flag: bool | None,
    placement: RequestedPlacement,
    selector: DeploymentSelector,
 ) -> DeploymentSource:
-    if push_to is None and placement.requested:
+    if push_to is None and image_uri is None and placement.requested:
        raise click.UsageError(
            "--listener-id and --k8s-namespace only apply when creating a "
-            "deployment with --push-to."
+            "deployment with --push-to or --image-uri."
        )
    if placement.requested and isinstance(selector, ById):
        raise click.UsageError(
@@ -1754,6 +1823,19 @@ def _select_source(
            "they cannot be set for an existing --deployment-id. Drop them, or "
            "create a new deployment with --name."
        )
+    if image_uri is not None:
+        if push_to is not None:
+            raise click.UsageError("--image-uri cannot be combined with --push-to.")
+        if image is not None:
+            raise click.UsageError("--image-uri cannot be combined with --image.")
+        if tag is not None:
+            raise click.UsageError("--image-uri cannot be combined with --tag.")
+        if remote_build_flag is not None:
+            raise click.UsageError("--image-uri cannot be combined with --remote.")
+        return CustomerRegistrySource(
+            image=PublishedImage(_validate_image_uri(image_uri)),
+            requested_placement=placement,
+        )
    if push_to is not None:
        if remote_build_flag is True:
            raise click.UsageError("--push-to cannot be combined with --remote.")
@@ -1761,8 +1843,7 @@ def _select_source(
        if image is None:
            _require_local_docker()
        return CustomerRegistrySource(
-            reference=reference,
-            prebuilt_image=image,
+            image=BuildAndPush(reference=reference, prebuilt_image=image),
            requested_placement=placement,
        )
    if image and remote_build_flag is True:
@@ -2075,19 +2156,30 @@ def _deploy_base_options(
                    "Give the tag here or with --tag (default: latest)."
                ),
            ),
+            click.option(
+                "--image-uri",
+                help=(
+                    "Deploy an image that's already in a registry you manage, "
+                    "without building, retagging, or pushing anything. For "
+                    "self-hosted and hybrid LangSmith. Give the full reference, "
+                    "e.g. 123456789.dkr.ecr.us-east-1.amazonaws.com/agents/"
+                    "my-agent:v1.2.3 or ...@sha256:<digest>. Cannot be combined "
+                    "with --push-to, --image, --tag, or --remote."
+                ),
+            ),
            click.option(
                "--listener-id",
                help=(
                    "Listener that will run the deployment, for workspaces that "
                    "deploy through a listener in your own cluster. Only used when "
-                    "creating a deployment with --push-to."
+                    "creating a deployment with --push-to or --image-uri."
                ),
            ),
            click.option(
                "--k8s-namespace",
                help=(
                    "Kubernetes namespace the listener deploys into. Only used when "
-                    "creating a deployment with --push-to."
+                    "creating a deployment with --push-to or --image-uri."
                ),
            ),
            click.option(
@@ -2200,6 +2292,7 @@ def _deploy_cmd(
    image_name: str | None,
    image: str | None,
    push_to: str | None,
+    image_uri: str | None,
    listener_id: str | None,
    k8s_namespace: str | None,
    tag: str | None,
@@ -2273,6 +2366,7 @@ def _deploy_cmd(
    source = _select_source(
        push_to=push_to,
        image=image,
+        image_uri=image_uri,
        image_name=image_name,
        tag=tag,
        remote_build_flag=remote_build_flag,
@@ -2408,6 +2502,41 @@ def deploy_list(
    click.echo(format_deployments_table(deployments))


+# ---------------------------------------------------------------------------
+# deploy listeners
+# ---------------------------------------------------------------------------
+
+
+@deploy.group(
+    "listeners",
+    cls=NestedHelpGroup,
+    help="[Beta] Inspect listeners available to this workspace.",
+)
+def deploy_listeners() -> None:
+    pass
+
+
+@OPT_HOST_API_KEY
+@OPT_HOST_URL
+@deploy_listeners.command(
+    "list",
+    help=(
+        "[Beta] List listeners available to this workspace.\n\n"
+        "Pass a listener's id to `langgraph deploy --push-to ... "
+        "--listener-id <id>` to deploy through it."
+    ),
+)
+def deploy_listeners_list(api_key: str | None, host_url: str | None) -> None:
+    client = _create_host_backend_client(host_url, api_key)
+    listeners = _call_host_backend_with_optional_tenant(
+        client, lambda c: c.list_listeners()
+    )
+    if not listeners:
+        click.echo("No listeners found for this workspace.")
+        return
+    click.echo(format_listeners_table(listeners))
+
+
 # ---------------------------------------------------------------------------
 # deploy revisions
 # ---------------------------------------------------------------------------
@@ -650,7 +650,8 @@ class Config(TypedDict, total=False):

    pip_config_file: str | None
    """Optional. Path to a pip config file (e.g., "/etc/pip.conf" or "pip.ini") for controlling
-    package installation (custom indices, credentials, etc.).
+    package installation (custom indices, timeouts, etc.). The file is copied into the
+    generated image, so it must not contain credentials or other secrets.

    Only relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.
    """
@@ -689,6 +690,9 @@ class Config(TypedDict, total=False):
      - "." or "./src" if you have a local Python package
      - str (aka "anthropic") for a PyPI package
      - "git+https://github.com/org/repo.git@main" for a Git-based package
+    Git HTTP URLs must not contain userinfo such as a username or token. For private
+    dependencies, provide short-lived credentials through the build environment's
+    secret-backed Git credential helper.
    Defaults to an empty list, meaning no additional packages installed beyond your base environment.

    This field is not supported when `source.kind` is `uv`.
@@ -880,6 +880,7 @@ def python_config_to_docker_uv_lock(
        _get_node_pm_install_cmd,
        _get_pip_cleanup_lines,
        _image_supports_uv,
+        _validate_git_http_url_userinfo_files,
        docker_tag,
    )

@@ -890,11 +891,20 @@ def python_config_to_docker_uv_lock(
        )

    config_root = config_path.parent.resolve()
+    source_root = config["source"].get("root", ".")
+    project_root = (config_root / source_root).resolve()
+    _validate_git_http_url_userinfo_files(
+        [project_root / "pyproject.toml", project_root / "uv.lock"]
+    )
+
    install_cmd = "uv pip install --system"
    _, global_reqs_pip_install, pip_config_file_str = _build_python_install_commands(
        config, install_cmd
    )
    plan = _plan_uv_lock_workspace(config_path, config)
+    _validate_git_http_url_userinfo_files(
+        package.pyproject_path for package in plan.install_order
+    )

    _update_uv_lock_graph_paths(config_path, config, plan)
    for section, key in [
@@ -28,7 +28,7 @@
                  "type": "null"
                }
              ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
            },
            "_INTERNAL_docker_tag": {
              "anyOf": [
@@ -270,7 +270,7 @@
                  "type": "null"
                }
              ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
            },
            "_INTERNAL_docker_tag": {
              "anyOf": [
@@ -28,7 +28,7 @@
                  "type": "null"
                }
              ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
            },
            "_INTERNAL_docker_tag": {
              "anyOf": [
@@ -270,7 +270,7 @@
                  "type": "null"
                }
              ],
-              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, credentials, etc.).\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
+              "description": "Optional. Path to a pip config file (e.g., \"/etc/pip.conf\" or \"pip.ini\") for controlling\npackage installation (custom indices, timeouts, etc.). The file is copied into the\ngenerated image, so it must not contain credentials or other secrets.\n\nOnly relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.\n"
            },
            "_INTERNAL_docker_tag": {
              "anyOf": [
@@ -453,6 +453,88 @@ def test_deploy_list_command_no_results(monkeypatch) -> None:
    assert result.output.strip() == "No deployments found."


+def test_deploy_listeners_list_command(monkeypatch) -> None:
+    runner = CliRunner()
+    captured: dict[str, str] = {}
+
+    class FakeClient:
+        def __init__(self, host_url: str, api_key: str, tenant_id: str | None = None):
+            captured["host_url"] = host_url
+            captured["api_key"] = api_key
+            captured["tenant_id"] = tenant_id or ""
+
+        def list_listeners(self):
+            return [
+                {
+                    "id": "listener-1",
+                    "compute_id": "prod-cluster",
+                    "compute_config": {"k8s_namespaces": ["agents"]},
+                },
+                {
+                    "id": "listener-2",
+                    "compute_id": "multi-cluster",
+                    "compute_config": {"k8s_namespaces": ["agents", "agents-staging"]},
+                },
+            ]
+
+    monkeypatch.setattr(deploy_module, "HostBackendClient", FakeClient)
+
+    result = runner.invoke(
+        cli,
+        [
+            "deploy",
+            "listeners",
+            "list",
+            "--api-key",
+            "test-key",
+            "--host-url",
+            "https://api.example.com",
+        ],
+    )
+
+    assert result.exit_code == 0, result.output
+    assert captured == {
+        "host_url": "https://api.example.com",
+        "api_key": "test-key",
+        "tenant_id": "",
+    }
+    assert "Listener ID" in result.output
+    assert "Compute ID" in result.output
+    assert "Namespaces" in result.output
+    assert "listener-1" in result.output
+    assert "prod-cluster" in result.output
+    assert "agents, agents-staging" in result.output
+
+
+def test_deploy_listeners_list_command_no_results(monkeypatch) -> None:
+    runner = CliRunner()
+
+    class FakeClient:
+        def __init__(self, host_url: str, api_key: str, tenant_id: str | None = None):
+            pass
+
+        def list_listeners(self):
+            return []
+
+    monkeypatch.setattr(deploy_module, "HostBackendClient", FakeClient)
+
+    result = runner.invoke(
+        cli,
+        [
+            "deploy",
+            "listeners",
+            "list",
+            "--api-key",
+            "test-key",
+            "--host-url",
+            "https://api.example.com",
+        ],
+    )
+
+    assert result.exit_code == 0, result.output
+    assert result.output.strip() == "No listeners found for this workspace."
+
+
 def test_deploy_revisions_list_command(monkeypatch) -> None:
    runner = CliRunner()
    captured: dict[str, str] = {}
@@ -695,6 +695,106 @@ def test_push_to_with_deployment_id_fetches_the_deployment_once(
    ]


+def test_image_uri_creates_an_external_deployment_without_any_docker_work(
+    deploy_project: DeployProject,
+) -> None:
+    result = deploy_project.run("--image-uri", EXTERNAL_DIGEST)
+
+    assert result.exit_code == 0, result.output
+    assert deploy_project.docker.verbs() == []
+    assert deploy_project.timeline == [LIST_DEPLOYMENTS, CREATE_DEPLOYMENT]
+    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT][
+        "source_revision_config"
+    ] == {"image_uri": EXTERNAL_DIGEST}
+
+
+def test_image_uri_updates_an_existing_external_deployment_without_any_docker_work(
+    deploy_project: DeployProject,
+) -> None:
+    deploy_project.control_plane.existing_deployments = [
+        {"id": "dep-ext", "name": "my-app", "source": "external_docker"}
+    ]
+
+    result = deploy_project.run("--image-uri", EXTERNAL_DIGEST)
+
+    assert result.exit_code == 0, result.output
+    assert deploy_project.docker.verbs() == []
+    assert deploy_project.timeline == [LIST_DEPLOYMENTS, _patch("dep-ext")]
+    assert deploy_project.control_plane.bodies[_patch("dep-ext")] == {
+        "source_revision_config": {"image_uri": EXTERNAL_DIGEST},
+        "secrets": [],
+        "tracked_packages": TRACKED_PACKAGES,
+    }
+
+
+def test_image_uri_places_a_new_deployment_on_the_only_listener(
+    deploy_project: DeployProject,
+) -> None:
+    deploy_project.control_plane.listeners = [LISTENER]
+
+    result = deploy_project.run(
+        "--image-uri", EXTERNAL_DIGEST, host_url=CLOUD_CONTROL_PLANE_URL
+    )
+
+    assert result.exit_code == 0, result.output
+    assert deploy_project.docker.verbs() == []
+    assert deploy_project.control_plane.bodies[CREATE_DEPLOYMENT]["source_config"] == {
+        "resource_spec": {},
+        "listener_id": LISTENER_ID,
+        "listener_config": {"k8s_namespace": "agents"},
+    }
+
+
+def test_image_uri_rejects_a_non_external_deployment_before_any_docker_work(
+    deploy_project: DeployProject,
+) -> None:
+    deploy_project.control_plane.existing_deployments = [
+        {"id": "dep-cli", "name": "my-app", "source": "internal_docker"}
+    ]
+
+    result = deploy_project.run("--image-uri", EXTERNAL_DIGEST)
+
+    assert result.exit_code != 0
+    assert "cannot be updated with --push-to or --image-uri" in result.output
+    assert deploy_project.docker.verbs() == []
+
+
+@pytest.mark.parametrize(
+    ("args", "message"),
+    [
+        pytest.param(
+            ("--image-uri", EXTERNAL_DIGEST, "--push-to", PUSH_REPOSITORY),
+            "--image-uri cannot be combined with --push-to.",
+            id="with_push_to",
+        ),
+        pytest.param(
+            ("--image-uri", EXTERNAL_DIGEST, "--image", "local/app:dev"),
+            "--image-uri cannot be combined with --image.",
+            id="with_image",
+        ),
+        pytest.param(
+            ("--image-uri", EXTERNAL_DIGEST, "--tag", "v2"),
+            "--image-uri cannot be combined with --tag.",
+            id="with_tag",
+        ),
+        pytest.param(
+            ("--image-uri", EXTERNAL_DIGEST, "--remote"),
+            "--image-uri cannot be combined with --remote.",
+            id="with_remote",
+        ),
+    ],
+)
+def test_image_uri_conflicting_flags_are_rejected_before_any_docker_work(
+    deploy_project: DeployProject, args: tuple[str, ...], message: str
+) -> None:
+    result = deploy_project.run(*args)
+
+    assert result.exit_code != 0
+    assert message in result.output
+    assert deploy_project.docker.verbs() == []
+    assert deploy_project.timeline == []
+
+
 def test_invalid_tag_fails_before_any_control_plane_call(
    deploy_project: DeployProject,
 ) -> None:
@@ -255,6 +255,243 @@ def test_validate_config():
        )


+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://user:secret-token@github.com/org/private.git@main",
+        "private-package @ git+http://token@github.com/org/private.git",
+        "git+HTTPS://user%40example.com:secret%2Ftoken@github.com/org/private.git",
+        "git+https://${GIT_TOKEN}@github.com/org/private.git",
+    ],
+)
+def test_validate_config_rejects_git_http_url_userinfo(dependency: str):
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config(
+            {
+                "python_version": "3.11",
+                "dependencies": [dependency],
+                "graphs": {"agent": "./agent.py:graph"},
+            }
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert "secret%2Ftoken" not in message
+
+
+def test_validate_config_file_reports_source_for_git_http_url_userinfo(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text(
+        json.dumps(
+            {
+                "python_version": "3.11",
+                "dependencies": ["git+https://secret-token@github.com/org/private.git"],
+                "graphs": {"agent": "./agent.py:graph"},
+            }
+        )
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config_file(config_path)
+
+    message = str(exc_info.value)
+    assert "secret-token" not in message
+    assert f"Found in: {config_path.resolve()}" in message
+
+
+@pytest.mark.parametrize(
+    "manifest", ["package.json", "package-lock.json", "yarn.lock", "pnpm-lock.yaml"]
+)
+def test_config_to_docker_rejects_git_http_url_userinfo_in_node_files(
+    tmp_path: pathlib.Path, manifest: str
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.js").write_text("export const graph = {};\n")
+    (tmp_path / "package.json").write_text('{"name":"agent"}\n')
+    (tmp_path / manifest).write_text(
+        '"priv": "git+https://user:secret-token@github.com/org/private.git"\n'
+    )
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraphjs-api",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert f"Found in: {(tmp_path / manifest).resolve()}" in message
+
+
+def test_config_to_docker_allows_node_git_urls_without_http_userinfo(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.js").write_text("export const graph = {};\n")
+    (tmp_path / "package.json").write_text(
+        '{"dependencies":{"public":"git+https://github.com/org/public.git"}}\n'
+    )
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    docker, _ = config_to_docker(
+        config_path,
+        config,
+        base_image="langchain/langgraphjs-api",
+    )
+
+    assert f"ADD . /deps/{tmp_path.name}" in docker
+
+
+def test_config_to_docker_rejects_git_http_url_userinfo_in_node_workspace(
+    tmp_path: pathlib.Path,
+):
+    config_root = tmp_path / "apps" / "agent"
+    config_root.mkdir(parents=True)
+    config_path = config_root / "langgraph.json"
+    config_path.write_text("{}\n")
+    (config_root / "agent.js").write_text("export const graph = {};\n")
+    (config_root / "package.json").write_text(
+        '{"dependencies":{"priv":"git+https://secret-token@github.com/org/private.git"}}\n'
+    )
+    (tmp_path / "package.json").write_text('{"name":"workspace"}\n')
+    config = validate_config(
+        {
+            "node_version": "20",
+            "graphs": {"agent": "./agent.js:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraphjs-api",
+            build_context=str(tmp_path),
+        )
+
+    message = str(exc_info.value)
+    assert "secret-token" not in message
+    assert f"Found in: {(config_root / 'package.json').resolve()}" in message
+
+
+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://github.com/org/public.git@main",
+        "private-package @ git+https://github.com/org/private.git@main",
+        "git+ssh://git@github.com/org/private.git@main",
+    ],
+)
+def test_validate_config_allows_git_urls_without_http_userinfo(dependency: str):
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": [dependency],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+
+    assert config["dependencies"] == [dependency]
+
+
+def test_config_to_docker_rejects_git_http_url_userinfo_in_requirements(
+    tmp_path: pathlib.Path,
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "agent.py").write_text("graph = object()\n")
+    (tmp_path / "requirements.txt").write_text(
+        "private @ git+https://secret-token@github.com/org/private.git\n"
+    )
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert f"Found in: {(tmp_path / 'requirements.txt').resolve()}" in message
+
+
+@pytest.mark.parametrize("manifest", ["pyproject.toml", "uv.lock"])
+def test_config_to_docker_rejects_git_http_url_userinfo_in_uv_files(
+    tmp_path: pathlib.Path, manifest: str
+):
+    config_path = tmp_path / "langgraph.json"
+    config_path.write_text("{}\n")
+    (tmp_path / "src").mkdir()
+    (tmp_path / "src" / "agent.py").write_text("graph = object()\n")
+    pyproject = textwrap.dedent(
+        """
+        [project]
+        name = "agent"
+        version = "0.1.0"
+        dependencies = ["private"]
+
+        [tool.uv.sources]
+        private = { git = "https://github.com/org/private.git" }
+        """
+    ).strip()
+    uv_lock = "# uv lock file\n"
+    if manifest == "pyproject.toml":
+        pyproject = pyproject.replace(
+            "https://github.com", "https://secret-token@github.com"
+        )
+    else:
+        uv_lock += (
+            'source = { git = "https://secret-token@github.com/org/private.git" }\n'
+        )
+    (tmp_path / "pyproject.toml").write_text(pyproject + "\n")
+    (tmp_path / "uv.lock").write_text(uv_lock)
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "graphs": {"agent": "./src/agent.py:graph"},
+            "source": {"kind": "uv"},
+        }
+    )
+
+    with pytest.raises(click.UsageError) as exc_info:
+        config_to_docker(
+            config_path,
+            config,
+            base_image="langchain/langgraph-api:0.2.47",
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+
+
 def test_validate_config_image_distro():
    """Test validation of image_distro field."""
    # Valid image_distro values should work
@@ -13,6 +13,7 @@ import pytest

 import langgraph_cli.deploy as deploy_mod
 from langgraph_cli.deploy import (
+    BuildAndPush,
    ById,
    ByName,
    CustomerRegistrySource,
@@ -21,6 +22,7 @@ from langgraph_cli.deploy import (
    Listener,
    ManagedRegistrySource,
    OnListener,
+    PublishedImage,
    RemoteBuildSource,
    RequestedPlacement,
    Unplaced,
@@ -614,6 +616,7 @@ class TestSelectSource:
    OPTIONS = {
        "push_to": None,
        "image": None,
+        "image_uri": None,
        "image_name": None,
        "tag": None,
        "remote_build_flag": None,
@@ -629,8 +632,10 @@ class TestSelectSource:
                {"push_to": REPOSITORY},
                True,
                CustomerRegistrySource(
-                    reference=ImageReference(REPOSITORY, "latest"),
-                    prebuilt_image=None,
+                    image=BuildAndPush(
+                        reference=ImageReference(REPOSITORY, "latest"),
+                        prebuilt_image=None,
+                    ),
                    requested_placement=RequestedPlacement(),
                ),
                id="push_to_selects_the_external_source_with_the_default_tag",
@@ -639,8 +644,10 @@ class TestSelectSource:
                {"push_to": f"{REPOSITORY}:v2"},
                True,
                CustomerRegistrySource(
-                    reference=ImageReference(REPOSITORY, "v2"),
-                    prebuilt_image=None,
+                    image=BuildAndPush(
+                        reference=ImageReference(REPOSITORY, "v2"),
+                        prebuilt_image=None,
+                    ),
                    requested_placement=RequestedPlacement(),
                ),
                id="push_to_keeps_a_tag_given_in_the_reference",
@@ -649,8 +656,10 @@ class TestSelectSource:
                {"push_to": REPOSITORY, "tag": "v3"},
                True,
                CustomerRegistrySource(
-                    reference=ImageReference(REPOSITORY, "v3"),
-                    prebuilt_image=None,
+                    image=BuildAndPush(
+                        reference=ImageReference(REPOSITORY, "v3"),
+                        prebuilt_image=None,
+                    ),
                    requested_placement=RequestedPlacement(),
                ),
                id="tag_flag_composes_with_push_to",
@@ -659,8 +668,10 @@ class TestSelectSource:
                {"push_to": REPOSITORY, "image": "app:dev"},
                False,
                CustomerRegistrySource(
-                    reference=ImageReference(REPOSITORY, "latest"),
-                    prebuilt_image="app:dev",
+                    image=BuildAndPush(
+                        reference=ImageReference(REPOSITORY, "latest"),
+                        prebuilt_image="app:dev",
+                    ),
                    requested_placement=RequestedPlacement(),
                ),
                id="prebuilt_image_is_retagged_for_push_to_without_docker_checks",
@@ -672,12 +683,44 @@ class TestSelectSource:
                },
                True,
                CustomerRegistrySource(
-                    reference=ImageReference(REPOSITORY, "latest"),
-                    prebuilt_image=None,
+                    image=BuildAndPush(
+                        reference=ImageReference(REPOSITORY, "latest"),
+                        prebuilt_image=None,
+                    ),
                    requested_placement=RequestedPlacement("listener-1", "agents"),
                ),
                id="push_to_carries_the_requested_placement",
            ),
+            pytest.param(
+                {"image_uri": f"{REPOSITORY}@sha256:abc123"},
+                True,
+                CustomerRegistrySource(
+                    image=PublishedImage(f"{REPOSITORY}@sha256:abc123"),
+                    requested_placement=RequestedPlacement(),
+                ),
+                id="image_uri_selects_the_published_image_source_by_digest",
+            ),
+            pytest.param(
+                {"image_uri": f"  {REPOSITORY}@sha256:abc123  "},
+                False,
+                CustomerRegistrySource(
+                    image=PublishedImage(f"{REPOSITORY}@sha256:abc123"),
+                    requested_placement=RequestedPlacement(),
+                ),
+                id="image_uri_needs_no_local_docker_and_is_trimmed",
+            ),
+            pytest.param(
+                {
+                    "image_uri": f"{REPOSITORY}@sha256:abc123",
+                    "placement": RequestedPlacement("listener-1", "agents"),
+                },
+                False,
+                CustomerRegistrySource(
+                    image=PublishedImage(f"{REPOSITORY}@sha256:abc123"),
+                    requested_placement=RequestedPlacement("listener-1", "agents"),
+                ),
+                id="image_uri_carries_the_requested_placement",
+            ),
            pytest.param(
                {"remote_build_flag": True},
                True,
@@ -763,6 +806,46 @@ class TestSelectSource:
                "only apply when creating a deployment with --push-to",
                id="namespace_without_push_to",
            ),
+            pytest.param(
+                {"image_uri": REPOSITORY, "push_to": REPOSITORY},
+                "--image-uri cannot be combined with --push-to.",
+                id="image_uri_with_push_to",
+            ),
+            pytest.param(
+                {"image_uri": REPOSITORY, "image": "app:dev"},
+                "--image-uri cannot be combined with --image.",
+                id="image_uri_with_image",
+            ),
+            pytest.param(
+                {"image_uri": REPOSITORY, "tag": "v2"},
+                "--image-uri cannot be combined with --tag.",
+                id="image_uri_with_tag",
+            ),
+            pytest.param(
+                {"image_uri": REPOSITORY, "remote_build_flag": True},
+                "--image-uri cannot be combined with --remote.",
+                id="image_uri_with_remote",
+            ),
+            pytest.param(
+                {"image_uri": ""},
+                "--image-uri must not be empty.",
+                id="image_uri_empty",
+            ),
+            pytest.param(
+                {"image_uri": "   "},
+                "--image-uri must not be empty.",
+                id="image_uri_blank",
+            ),
+            pytest.param(
+                {"image_uri": f"{REPOSITORY}:v1.2.3"},
+                "--image-uri must pin a digest",
+                id="image_uri_with_a_mutable_tag",
+            ),
+            pytest.param(
+                {"image_uri": REPOSITORY},
+                "--image-uri must pin a digest",
+                id="image_uri_without_any_tag_or_digest",
+            ),
        ],
    )
    def test_conflicting_flags_are_rejected(self, monkeypatch, flags, message):
@@ -1164,6 +1247,7 @@ def test_a_deployment_id_with_listener_flags_is_refused_without_probing_docker(
        _select_source(
            push_to="registry.example.com/app",
            image=None,
+            image_uri=None,
            image_name=None,
            tag=None,
            remote_build_flag=None,
@@ -3,6 +3,7 @@ from unittest.mock import patch
 from langgraph_cli.deploy import (
    _extract_deployment_url,
    format_deployments_table,
+    format_listeners_table,
    format_revisions_table,
 )
 from langgraph_cli.util import clean_empty_lines, warn_non_wolfi_distro
@@ -255,3 +256,34 @@ def test_format_revisions_table():
    assert "rev-456" in output
    assert "rev-789" in output
    assert "REPLACED" in output
+
+
+def test_format_listeners_table():
+    output = format_listeners_table(
+        [
+            {
+                "id": "listener-1",
+                "compute_id": "prod-cluster",
+                "compute_config": {"k8s_namespaces": ["agents"]},
+            },
+            {
+                "id": "listener-2",
+                "compute_id": "multi-cluster",
+                "compute_config": {"k8s_namespaces": ["agents", "agents-staging"]},
+            },
+            {
+                "id": "listener-3",
+                "compute_id": "broken-cluster",
+            },
+        ]
+    )
+    assert "Listener ID" in output
+    assert "Compute ID" in output
+    assert "Namespaces" in output
+    assert "listener-1" in output
+    assert "prod-cluster" in output
+    assert "agents" in output
+    assert "listener-2" in output
+    assert "agents, agents-staging" in output
+    assert "listener-3" in output
+    assert "broken-cluster" in output
@@ -732,11 +732,11 @@ wheels = [

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+    { url = "https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl", hash = "sha256:0cf3cae568d36aa9576b28dfb35f11328f1cb974ca7647d9475ebb86c75ac6e3", size = 135717, upload-time = "2026-09-15T19:29:34.577Z" },
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 [[package]]
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+version = "2.8.0"
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+version = "1.18.1"
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+version = "0.4.5"
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 [[package]]
@@ -2243,11 +2242,11 @@ wheels = [

 [[package]]
 name = "urllib3"
-version = "2.7.0"
+version = "2.8.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/53/0c/06f8b233b8fd13b9e5ee11424ef85419ba0d8ba0b3138bf360be2ff56953/urllib3-2.7.0.tar.gz", hash = "sha256:231e0ec3b63ceb14667c67be60f2f2c40a518cb38b03af60abc813da26505f4c", size = 433602, upload-time = "2026-05-07T16:13:18.596Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e3/05/b17359e1cefb4f909b5e40b1b90a496d987258916dbbf88e842c729f510e/urllib3-2.8.0.tar.gz", hash = "sha256:63bf2ead4c879426ebf22ef2a781eeb4aa3b4ae798a0435506f8687fd5bb9b63", size = 458972, upload-time = "2026-09-15T19:29:36.253Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl", hash = "sha256:0cf3cae568d36aa9576b28dfb35f11328f1cb974ca7647d9475ebb86c75ac6e3", size = 135717, upload-time = "2026-09-15T19:29:34.577Z" },
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 [[package]]
@@ -2376,7 +2375,7 @@ wheels = [

 [[package]]
 name = "virtualenv"
-version = "21.2.4"
+version = "21.7.13"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "distlib" },
@@ -2385,9 +2384,9 @@ dependencies = [
    { name = "python-discovery" },
    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/0c/98/3a7e644e19cb26133488caff231be390579860bbbb3da35913c49a1d0a46/virtualenv-21.2.4.tar.gz", hash = "sha256:b294ef68192638004d72524ce7ef303e9d0cf5a44c95ce2e54a7500a6381cada", size = 5850742, upload-time = "2026-04-14T22:15:31.438Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/13/50/c9b84eb106d0db420b9878dac0a386c5791726f127ce20b06897f6e3a1e9/virtualenv-21.7.13.tar.gz", hash = "sha256:0355558b6f33619aab31347e43643b0ebc97f61ea3acf617b2b69e1f8a843d11", size = 5360306, upload-time = "2026-09-18T04:35:49.354Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/9a/ce/e74453531b0c49a58d0e8a4f9bab4495705859fee4a4f7de27d58f4a791a/virtualenv-21.7.13-py3-none-any.whl", hash = "sha256:1bea5af7463f59c4719db48fe739579a2a4f569c96f26c086edda85c96da9f59", size = 5328680, upload-time = "2026-09-18T04:35:47.194Z" },
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 [[package]]
@@ -23,6 +23,9 @@ RETURN = sys.intern("__return__")
 # for writes of a task where we simply record the return value
 PREVIOUS = sys.intern("__previous__")
 # the implicit branch that handles each node's Control values
+SNAPSHOT_BUMPS = sys.intern("__snapshot_bumps__")
+# `versions_seen` key recording which entries a snapshot-only version bump
+# advanced, and the versions those nodes really read


 # --- Reserved cache namespaces ---
@@ -116,6 +119,7 @@ RESERVED = {
    ERROR,
    ERROR_SOURCE_NODE,
    NO_WRITES,
+    SNAPSHOT_BUMPS,
    # reserved config.configurable keys
    CONFIG_KEY_SEND,
    CONFIG_KEY_READ,
@@ -235,7 +235,7 @@ def add_messages(

    if format == "langchain-openai":
        merged = _format_messages(merged)
-    elif format:
+    elif cast(str | None, format):
        msg = f"Unrecognized {format=}. Expected one of 'langchain-openai', None."
        raise ValueError(msg)
    else:
@@ -27,6 +27,7 @@ from langgraph.checkpoint.base import (
    Checkpoint,
    PendingWrite,
    V,
+    writes_sort_key,
 )
 from langgraph.store.base import BaseStore
 from xxhash import xxh3_128_hexdigest
@@ -251,9 +252,7 @@ def apply_writes(
        Set of channels that were updated in this step.
    """
    # sort tasks on path, to ensure deterministic order for update application
-    # any path parts after the 3rd are ignored for sorting
-    # (we use them for eg. task ids which aren't good for sorting)
-    tasks = sorted(tasks, key=lambda t: task_path_str(t.path[:3]))
+    tasks = sorted(tasks, key=lambda t: writes_sort_key(task_path_str(t.path)))
    # if no task has triggers this is applying writes from the null task only
    # so we don't do anything other than update the channels written to
    bump_step = any(t.triggers for t in tasks)
@@ -3,18 +3,32 @@ from __future__ import annotations
 import uuid
 from collections.abc import Callable, Iterable, Mapping
 from datetime import datetime, timezone
-from typing import Any, cast
+from inspect import signature
+from typing import Any, Literal, cast

 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
    BaseCheckpointSaver,
+    ChannelVersions,
    Checkpoint,
+    CheckpointTuple,
+    PendingWrite,
 )
 from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.types import _DeltaSnapshot

-from langgraph._internal._config import DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT
-from langgraph._internal._constants import PUSH
+from langgraph._internal._config import (
+    DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT,
+    patch_configurable,
+)
+from langgraph._internal._constants import (
+    CONF,
+    CONFIG_KEY_CHECKPOINT_ID,
+    NS_END,
+    NS_SEP,
+    PUSH,
+    SNAPSHOT_BUMPS,
+)
 from langgraph._internal._typing import MISSING
 from langgraph.channels.base import BaseChannel
 from langgraph.channels.delta import DeltaChannel
@@ -36,6 +50,15 @@ def empty_checkpoint() -> Checkpoint:
    )


+def put_writes_accepts_task_path(put_writes: Callable[..., Any]) -> bool:
+    """Whether a saver's `put_writes` or `aput_writes` takes `task_path`.
+
+    Savers written before the parameter existed don't, so it is passed only
+    when this is true.
+    """
+    return signature(put_writes).parameters.get("task_path") is not None
+
+
 def exit_delta_task_id(step: int, task_id: str) -> str:
    """Synthetic task id for exit-mode DeltaChannel writes.

@@ -47,20 +70,36 @@ def exit_delta_task_id(step: int, task_id: str) -> str:
    return f"{step:08d}-{parts[1]}-{parts[2]}-{parts[3]}-{parts[4]}"


+def exit_delta_late_task_id(step: int, task_id: str) -> str:
+    """Synthetic task id for exit-mode writes of a superstep after the anchor's own.
+
+    Sorts after every real task id, in step order, so replay keeps them after
+    the anchor's own superstep whether a saver orders by task path or task id.
+    """
+    parts = str(uuid.UUID(task_id)).split("-")
+    return f"ffffffff-{step >> 16:04x}-{step & 0xFFFF:04x}-{parts[3]}-{parts[4]}"
+
+
 def delta_channels_to_snapshot(
    channels: Mapping[str, BaseChannel],
    counters_since_delta_snapshot: Mapping[str, tuple[int, int]],
+    channel_versions: ChannelVersions,
 ) -> 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.
+    reaches `DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`. A channel without a version
+    was never written on this branch, so it has nothing to 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():
+        if (
+            not isinstance(ch, DeltaChannel)
+            or not ch.is_available()
+            or name not in channel_versions
+        ):
            continue
        updates, supersteps = counters_since_delta_snapshot.get(name, (0, 0))
        if (
@@ -80,15 +119,63 @@ def get_updated_channels_from_tasks(

 def get_delta_channels_from_all_channels(
    channels: Mapping[str, BaseChannel],
+    channel_versions: ChannelVersions,
 ) -> set[str]:
-    """DeltaChannels to snapshot on the first update_state of a fresh thread."""
+    """DeltaChannels to snapshot on the first update_state of a fresh thread:
+    the ones it wrote, as the rest have no version and nothing to store."""
    return {
        k
        for k, ch in channels.items()
-        if isinstance(ch, DeltaChannel) and ch.is_available()
+        if isinstance(ch, DeltaChannel) and ch.is_available() and k in channel_versions
    }


+def delta_channels_with_pending_writes(
+    specs: Mapping[str, Any],
+    pending_writes: Iterable[PendingWrite] | None,
+) -> set[str]:
+    """DeltaChannels a branch starting from this checkpoint must snapshot.
+
+    A checkpoint's pending writes belong to the child that consumed them, and
+    nothing records which child that was. A new branch snapshots every delta
+    channel they touch, so its ancestor walk never replays them.
+    """
+    return {
+        ch
+        for _, ch, _ in pending_writes or ()
+        if isinstance(specs.get(ch), DeltaChannel)
+    }
+
+
+def checkpoint_superseded(
+    saver: BaseCheckpointSaver, config: RunnableConfig, saved: CheckpointTuple
+) -> bool:
+    """Whether the thread has moved past `saved`, the checkpoint `config` addressed.
+
+    A checkpoint with a child is never the latest put, so this misses none. A
+    leaf of an abandoned branch counts as well; telling it apart would mean
+    listing the thread to look for children, which the saver can't do cheaply.
+    """
+    if not config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
+        return False
+    latest = saver.get_tuple(
+        patch_configurable(config, {CONFIG_KEY_CHECKPOINT_ID: None})
+    )
+    return latest is not None and latest.checkpoint["id"] != saved.checkpoint["id"]
+
+
+async def acheckpoint_superseded(
+    saver: BaseCheckpointSaver, config: RunnableConfig, saved: CheckpointTuple
+) -> bool:
+    """Async `checkpoint_superseded`."""
+    if not config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
+        return False
+    latest = await saver.aget_tuple(
+        patch_configurable(config, {CONFIG_KEY_CHECKPOINT_ID: None})
+    )
+    return latest is not None and latest.checkpoint["id"] != saved.checkpoint["id"]
+
+
 def create_metadata_for_update_state_api(
    channels: Mapping[str, BaseChannel],
    updated_channels: set[str],
@@ -118,26 +205,34 @@ def create_checkpoint_plan_for_update_state_api(
    channels: Mapping[str, BaseChannel],
    updated_channels: set[str],
    *,
+    source: Literal["update", "input"],
    step: int,
    parents: dict[str, Any],
    saved_metadata: Mapping[str, Any] | None,
    is_fresh_thread: bool,
+    fork_channels: set[str],
+    channel_versions: ChannelVersions,
 ) -> tuple[set[str], dict[str, Any]]:
    """Return ``(channels_to_snapshot, metadata)`` for an update_state head."""
    metadata: dict[str, Any] = {
-        "source": "update",
+        "source": source,
        "step": step,
        "parents": parents,
    }
    if is_fresh_thread:
-        return get_delta_channels_from_all_channels(channels), metadata
+        return get_delta_channels_from_all_channels(
+            channels, channel_versions
+        ), metadata

    new_counters = create_metadata_for_update_state_api(
        channels,
        updated_channels,
        prev_metadata=saved_metadata,
    )
-    channels_to_snapshot = delta_channels_to_snapshot(channels, new_counters)
+    channels_to_snapshot = (
+        delta_channels_to_snapshot(channels, new_counters, channel_versions)
+        | fork_channels
+    )
    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)}
@@ -155,6 +250,7 @@ def create_checkpoint(
    updated_channels: set[str] | None = None,
    get_next_version: GetNextVersion | None = None,
    channels_to_snapshot: set[str] | None = None,
+    stored_versions: ChannelVersions | None = None,
 ) -> Checkpoint:
    """Build a new Checkpoint from the previous one and live channel state.

@@ -164,9 +260,14 @@ def create_checkpoint(
    from `checkpoint_writes`. Callers compute the set via
    `delta_channels_to_snapshot(channels, counters)`; defaults to empty
    (no snapshots) when not provided.
+
+    `stored_versions` are the channel versions of the last checkpoint the
+    saver stored. A snapshotted channel whose version has not moved since
+    then is bumped.
    """
    ts = datetime.now(timezone.utc).isoformat()
    channels_to_snapshot = channels_to_snapshot or set()
+    bumped: dict[str, tuple[Any, Any]] = {}
    if channels is None:
        values = checkpoint["channel_values"]
        channel_versions = checkpoint["channel_versions"]
@@ -174,30 +275,29 @@ def create_checkpoint(
        values = {}
        channel_versions = dict(checkpoint["channel_versions"])
        for k in channels:
-            if k not in channel_versions:
-                continue
            ch = channels[k]
+            if k not in channel_versions:
+                # A forced snapshot of a never-written channel still has to
+                # land to stop the ancestor walk, and `put` only stores blobs
+                # for versioned channels.
+                if k in channels_to_snapshot and get_next_version is not None:
+                    channel_versions[k] = get_next_version(None, None)
+                    bumped[k] = (None, channel_versions[k])
+                    values[k] = _DeltaSnapshot(ch.get())
+                continue
            if k in channels_to_snapshot:
-                # Callers force a full snapshot blob here: exit mode when a
-                # delta channel reaches its snapshot cadence, and update_state
-                # on a fresh thread (no ancestor to replay writes from). The
-                # manual version-bump below only applies to the exit-mode case.
-                #
-                # In exit mode, the snapshot decision is deferred to exit
-                # time (intermediate steps have do_checkpoint=False). The
-                # channel's count may have reached snapshot_frequency over
-                # 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
+                # `put` only stores a blob for a channel whose version moved,
+                # so snapshotting a channel this step did not write needs a
+                # bump: exit mode reaching the cadence on a superstep that
+                # skipped the channel, and a fork's first checkpoint.
+                if (
+                    get_next_version is not None
+                    and stored_versions is not None
+                    and channel_versions[k] == stored_versions.get(k)
                ):
-                    channel_versions[k] = get_next_version(channel_versions[k], None)
+                    old = channel_versions[k]
+                    channel_versions[k] = get_next_version(old, None)
+                    bumped[k] = (old, channel_versions[k])
                values[k] = _DeltaSnapshot(ch.get())
            else:
                v = ch.checkpoint()
@@ -209,21 +309,99 @@ def create_checkpoint(
        id=id or str(uuid6(clock_seq=step)),
        channel_values=values,
        channel_versions=channel_versions,
-        versions_seen=checkpoint["versions_seen"],
+        versions_seen=_mark_bumps_seen(checkpoint["versions_seen"], bumped),
        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.
+def _mark_bumps_seen(
+    versions_seen: dict[str, ChannelVersions],
+    bumped: Mapping[str, tuple[Any, Any]],
+) -> dict[str, ChannelVersions]:
+    """Advance whoever had seen a bumped channel's old version to the new one.

-    `_DeltaSnapshot` blobs and plain values (migration) resolve directly via
-    `from_checkpoint` — only absence (`MISSING`) triggers replay.
+    A bump that only stores a snapshot is not a write. Left unseen, it would
+    re-fire `interrupt_before` and rerun the channel's subscribers. For each
+    entry it advances, `SNAPSHOT_BUMPS` keeps the new version and the one the
+    node really read, so `versions_seen_without_bumps` can put the read back.
    """
-    if not isinstance(spec, DeltaChannel):
-        return False
-    return stored is MISSING
+    if not bumped:
+        return versions_seen
+    out = dict(versions_seen)
+    marks = dict(versions_seen.get(SNAPSHOT_BUMPS, {}))
+    for node, seen in versions_seen.items():
+        if node == SNAPSHOT_BUMPS:
+            continue
+        for k, (old, new) in bumped.items():
+            if seen.get(k) != old:
+                continue
+            advanced, read = _bump_keys(node, k)
+            # If an earlier bump set `old`, the real read is already recorded.
+            if old is not None and marks.get(advanced) != old:
+                marks[read] = old
+            marks[advanced] = new
+            out[node] = {**out[node], k: new}
+    if marks:
+        out[SNAPSHOT_BUMPS] = marks
+    return out
+
+
+def _bump_keys(node: str, channel: str) -> tuple[str, str]:
+    # Node names can't contain either separator, so the keys can't collide.
+    return f"{node}{NS_SEP}{channel}", f"{node}{NS_END}{channel}"
+
+
+def versions_seen_without_bumps(
+    versions_seen: dict[str, ChannelVersions],
+) -> dict[str, ChannelVersions]:
+    """`versions_seen` as the nodes read it: an entry a bump advanced goes back
+    to the version the node really read, or away if it never read one."""
+    if not (marks := versions_seen.get(SNAPSHOT_BUMPS)):
+        return versions_seen
+    out: dict[str, ChannelVersions] = {}
+    for node, seen in versions_seen.items():
+        if node == SNAPSHOT_BUMPS:
+            continue
+        out[node] = {}
+        for k, v in seen.items():
+            advanced, read = _bump_keys(node, k)
+            if marks.get(advanced) != v:
+                out[node][k] = v
+            elif read in marks:
+                out[node][k] = marks[read]
+    return out
+
+
+def _delta_channels_to_replay(
+    specs: Mapping[str, BaseChannel], checkpoint: Checkpoint
+) -> list[str]:
+    """DeltaChannels whose value at `checkpoint` the ancestor walk rebuilds.
+
+    A `_DeltaSnapshot` blob or a plain value (migration) resolves directly via
+    `from_checkpoint`, so only a channel with nothing stored here needs the
+    walk. A channel with no version was never written, so it is empty without
+    one; a walk for it would find no snapshot to stop at and read every
+    ancestor, every time the thread is loaded.
+    """
+    return [
+        k
+        for k, spec in specs.items()
+        if isinstance(spec, DeltaChannel)
+        and k in checkpoint["channel_versions"]
+        and checkpoint["channel_values"].get(k, MISSING) is MISSING
+    ]
+
+
+def _require_saver_for_history(
+    delta_channels: list[str],
+    saver: BaseCheckpointSaver | None,
+    config: RunnableConfig | None,
+) -> None:
+    if delta_channels and (saver is None or config is None):
+        raise ValueError(
+            f"DeltaChannel {delta_channels} has history to replay but no "
+            "checkpointer or config was passed to read it"
+        )


 def channels_from_checkpoint(
@@ -251,11 +429,8 @@ def channels_from_checkpoint(
        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))
-    ]
+    delta_channels = _delta_channels_to_replay(channel_specs, checkpoint)
+    _require_saver_for_history(delta_channels, saver, config)
    histories: Mapping[str, Any] = {}
    if delta_channels and saver is not None and config is not None:
        histories = saver.get_delta_channel_history(
@@ -293,11 +468,8 @@ async def achannels_from_checkpoint(
        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))
-    ]
+    delta_channels = _delta_channels_to_replay(channel_specs, checkpoint)
+    _require_saver_for_history(delta_channels, saver, config)
    histories: Mapping[str, Any] = {}
    if delta_channels and saver is not None and config is not None:
        histories = await saver.aget_delta_channel_history(
@@ -12,7 +12,6 @@ from contextlib import (
    ExitStack,
 )
 from datetime import datetime, timezone
-from inspect import signature
 from types import TracebackType
 from typing import (
    Any,
@@ -98,12 +97,17 @@ from langgraph.pregel._algo import (
 )
 from langgraph.pregel._checkpoint import (
    achannels_from_checkpoint,
+    acheckpoint_superseded,
    channels_from_checkpoint,
+    checkpoint_superseded,
    copy_checkpoint,
    create_checkpoint,
    delta_channels_to_snapshot,
+    delta_channels_with_pending_writes,
    empty_checkpoint,
+    exit_delta_late_task_id,
    exit_delta_task_id,
+    put_writes_accepts_task_path,
 )
 from langgraph.pregel._executor import (
    AsyncBackgroundExecutor,
@@ -119,6 +123,7 @@ from langgraph.pregel._io import (
 )
 from langgraph.pregel._messages import ensure_message_ids
 from langgraph.pregel._read import PregelNode
+from langgraph.pregel._task_status import read_task_statuses
 from langgraph.pregel._utils import get_new_channel_versions, is_xxh3_128_hexdigest
 from langgraph.pregel.debug import (
    map_debug_checkpoint,
@@ -186,6 +191,7 @@ class PregelLoop:
        Callable[
            [
                concurrent.futures.Future | None,
+                Sequence[Any],
                RunnableConfig,
                Checkpoint,
                str,
@@ -199,11 +205,13 @@ class PregelLoop:
    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.
+    # writes. `_put_checkpoint` hands this list to the save it submits, which
+    # waits for them first, so a checkpoint never becomes durable before the
+    # writes that produced it. If a write or the previous save failed, the
+    # save fails too: a DeltaChannel is rebuilt from its writes along the
+    # parent chain, so a checkpoint saved past either gap reads back short
+    # for good. 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.
@@ -217,15 +225,34 @@ class PregelLoop:
    # `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
+    # Each tuple is `(step, task_id, task_path, channel, value)`; see
+    # `_put_exit_delta_writes` for how they are ordered.
+    _exit_delta_writes: list[tuple[int, str, str, str, Any]] | None = None

-    # Delta channels that saw an Overwrite since the last checkpoint. These
-    # channels must snapshot after live update applies overwrite semantics so
-    # sparse replay starts from the same post-overwrite value.
-    _delta_channels_with_overwrite: set[str]
+    # The (task_id, channel) pairs whose delta writes are stored on the loaded
+    # checkpoint, which a resume addressed by `checkpoint_id` can rerun; this
+    # run's `Command` delta writes, kept apart from the NULL_TASK_ID writes
+    # loaded with the checkpoint; and the checkpoint's own superstep, the
+    # first one this run ticks.
+    _stored_delta_writes: set[tuple[str, str]]
+    _exit_command_writes: list[tuple[str, Any]]
+    _exit_first_step: int | None = None
+
+    # Delta channels that must snapshot at the next checkpoint, whatever their
+    # cadence counters say:
+    # * an Overwrite arrived since the last checkpoint, so sparse replay has to
+    #   start from the post-overwrite value;
+    # * the checkpoint this run starts from has pending writes to them; see
+    #   `delta_channels_with_pending_writes`.
+    _delta_channels_forced_snapshot: set[str]
+    # Set by `_first` for a resume: the writes it loaded with the checkpoint,
+    # which `after_tick` checks against the ones reapply handed back.
+    _resume_loaded_writes: Sequence[PendingWrite] = ()
+    # Tasks `_reapply_writes_to_succeeded_nodes` handed loaded writes back to.
+    _reapplied_task_ids: set[str]
+    # An update or fork checkpoint addressed by `checkpoint_id` that the thread
+    # has moved past, so it may already have children.
+    _addressed_checkpoint_superseded: bool = False

    # The checkpoint_config that points at the parent loaded at `__enter__`
    # (or the synthetic-empty checkpoint, on first run). We capture it
@@ -581,7 +608,7 @@ class PregelLoop:
            # save the new task
            self.tasks[pushed.id] = pushed
            # match any pending writes to the new task
-            if not self.is_replaying:
+            if self._reapplies_pending_writes:
                self._reapply_writes_to_succeeded_nodes({pushed.id: pushed})
            # return the new task, to be started if not run before
            return pushed
@@ -659,7 +686,7 @@ class PregelLoop:
            return False

        # if there are pending writes from a previous loop, apply them
-        if not self.is_replaying and self.checkpoint_pending_writes:
+        if self._reapplies_pending_writes and self.checkpoint_pending_writes:
            self._reapply_writes_to_succeeded_nodes(self.tasks)
            self._resume_error_handlers_if_applicable()

@@ -683,11 +710,26 @@ class PregelLoop:
    def after_tick(self) -> None:
        # finish superstep
        writes = [w for t in self.tasks.values() for w in t.writes]
-        self._delta_channels_with_overwrite.update(
+        self._delta_channels_forced_snapshot.update(
            ch
            for ch, v in writes
            if isinstance(self.specs.get(ch), DeltaChannel) and _get_overwrite(v)[0]
        )
+        if self._resume_loaded_writes:
+            # A loaded write reapply didn't hand back belongs to a task this run
+            # drops or reruns: a `Send` that `Command(goto=...)` replaced, or an
+            # error handler that runs again.
+            self._delta_channels_forced_snapshot.update(
+                delta_channels_with_pending_writes(
+                    self.specs,
+                    [
+                        w
+                        for w in self._resume_loaded_writes
+                        if w[0] not in self._reapplied_task_ids
+                    ],
+                )
+            )
+            self._resume_loaded_writes = ()
        # all tasks have finished
        self.updated_channels = apply_writes(
            self.checkpoint,
@@ -707,9 +749,25 @@ class PregelLoop:
            )
        # capture delta-channel writes for exit-mode accumulator before clearing
        if self._exit_delta_writes is not None:
+            # On the first tick the pending writes still hold the ones loaded
+            # with the checkpoint, which are already stored on it.
+            first = self._exit_first_step is None
+            if first:
+                self._exit_first_step = self.step
+                self._exit_delta_writes.extend(
+                    (self.step, NULL_TASK_ID, "", ch, v)
+                    for ch, v in self._exit_command_writes
+                )
            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))
+                if not isinstance(self.specs.get(ch), DeltaChannel):
+                    continue
+                if first and (
+                    tid == NULL_TASK_ID or (tid, ch) in self._stored_delta_writes
+                ):
+                    continue
+                task = self.tasks.get(tid)
+                path = task_path_str(task.path) if task else ""
+                self._exit_delta_writes.append((self.step, tid, path, ch, v))
        # clear pending writes
        self.checkpoint_pending_writes.clear()
        # only replay (re-execute) done tasks on the first tick
@@ -733,20 +791,24 @@ class PregelLoop:

    # private

+    @property
+    def _reapplies_pending_writes(self) -> bool:
+        """Whether the writes loaded with the checkpoint go back to the tasks
+        that made them, instead of those tasks rerunning."""
+        return not self.is_replaying
+
    def _reapply_writes_to_succeeded_nodes(
        self, tasks: Mapping[str, PregelExecutableTask]
    ) -> None:
-        """Restore successful channel writes from checkpoint to in-memory tasks.
+        """Restore the output of finished tasks 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.
+        Unfinished (failed or interrupted) tasks keep empty writes, so the
+        runner re-executes them or routes them to error handlers.
        """
-        for tid, k, v in self.checkpoint_pending_writes:
-            if k in (ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME):
-                continue
+        for tid, status in read_task_statuses(self.checkpoint_pending_writes).items():
            if task := tasks.get(tid):
-                task.writes.append((k, v))
+                task.writes.extend(status.output)
+                self._reapplied_task_ids.add(tid)

    def _resume_error_handlers_if_applicable(self) -> None:
        """On resume, schedule error handlers for tasks that failed in a prior run.
@@ -816,38 +878,22 @@ class PregelLoop:
                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
-        pending_interrupts: dict[str, str] = {}
-
-        # set of resume task ids
-        pending_resumes: set[str] = set()
-
-        for task_id, write_type, value in self.checkpoint_pending_writes:
-            if write_type == INTERRUPT:
-                # interrupts is always a list, but there should only be one element
-                pending_interrupts[task_id] = value[0].id
-            elif write_type == RESUME:
-                pending_resumes.add(task_id)
-
-        resumed_interrupt_ids = {
-            pending_interrupts[task_id]
-            for task_id in pending_resumes
-            if task_id in pending_interrupts
+        """Return the ids of interrupts that are still waiting for an answer."""
+        return {
+            interrupt.id
+            for status in read_task_statuses(self.checkpoint_pending_writes).values()
+            for interrupt in status.pending_interrupts
        }

-        # Keep only interrupts whose interrupt_id is not resumed
-        hanging_interrupts: set[str] = {
-            interrupt_id
-            for interrupt_id in pending_interrupts.values()
-            if interrupt_id not in resumed_interrupt_ids
-        }
-
-        return hanging_interrupts
-
    def _first(
        self, *, input_keys: str | Sequence[str], updated_channels: set[str] | None
    ) -> set[str] | None:
+        self._stored_delta_writes = {
+            (tid, ch)
+            for tid, ch, _ in self.checkpoint_pending_writes
+            if tid != NULL_TASK_ID and isinstance(self.specs.get(ch), DeltaChannel)
+        }
+        self._exit_command_writes = []
        # Resuming from a previous checkpoint requires two things:
        # 1. A prior checkpoint exists (channel_versions is non-empty)
        # 2. The input signals continuation (not a fresh run with new input)
@@ -898,6 +944,39 @@ class PregelLoop:
            self.checkpoint_pending_writes = [
                w for w in self.checkpoint_pending_writes if w[1] != RESUME
            ]
+        # The parent checkpoint subgraphs replay from, when a fork below would
+        # otherwise move it
+        replay_bound: RunnableConfig | None = None
+        # Whether this run saves a fork checkpoint (below) to start its branch.
+        # The fork carries a `Command`'s writes itself, so nothing this run
+        # writes is stored on the checkpoint it addressed, which may have
+        # children that replay it.
+        forks = (
+            is_resuming
+            and is_time_traveling
+            and (
+                self.checkpoint_metadata.get("source") not in ("update", "fork")
+                or self._addressed_checkpoint_superseded
+            )
+        )
+        carried: list[PendingWrite] = []
+        # A resume that reapplies the head's pending writes only learns which
+        # of them go back to their tasks once those are scheduled, so
+        # `after_tick` seals the rest. Kept apart from the writes this run adds.
+        reapplies = is_resuming and self._reapplies_pending_writes
+        self._resume_loaded_writes = (
+            [w for w in self.checkpoint_pending_writes if w[0] != NULL_TASK_ID]
+            if reapplies
+            else ()
+        )
+        self._reapplied_task_ids = set()
+        self._delta_channels_forced_snapshot = (
+            set()
+            if reapplies
+            else delta_channels_with_pending_writes(
+                self.specs, self.checkpoint_pending_writes
+            )
+        )

        # map command to writes
        if input_is_command:
@@ -928,10 +1007,24 @@ class PregelLoop:
                raise EmptyInputError("Received empty Command input")
            # save writes
            for tid, ws in writes.items():
-                self.put_writes(tid, ws)
+                if forks:
+                    carried.extend((tid, c, v) for c, v in ws)
+                else:
+                    self.put_writes(tid, ws)
+                    if self._exit_delta_writes is not None and tid == NULL_TASK_ID:
+                        self._exit_command_writes.extend(
+                            (c, v)
+                            for c, v in ws
+                            if isinstance(self.specs.get(c), DeltaChannel)
+                        )
+            self._delta_channels_forced_snapshot.update(
+                delta_channels_with_pending_writes(self.specs, carried)
+            )
        # apply NULL writes
        if null_writes := [
-            w[1:] for w in self.checkpoint_pending_writes if w[0] == NULL_TASK_ID
+            w[1:]
+            for w in (*self.checkpoint_pending_writes, *carried)
+            if w[0] == NULL_TASK_ID
        ]:
            null_updated_channels = apply_writes(
                self.checkpoint,
@@ -956,11 +1049,15 @@ class PregelLoop:
            # the parent's latest checkpoint remains the old one and
            # subsequent resumes load the wrong state.
            # Skip for update_state forks (source=update/fork) since they
-            # already have their own fork checkpoint.
-            if is_time_traveling and self.checkpoint_metadata.get("source") not in (
-                "update",
-                "fork",
-            ):
+            # already have their own fork checkpoint, unless the thread moved
+            # past it: its other children would replay whatever this run
+            # stores on it.
+            if forks:
+                if (
+                    self.checkpoint_metadata.get("source") in ("update", "fork")
+                    and self.prev_checkpoint_config
+                ):
+                    replay_bound = self.prev_checkpoint_config
                # Clear old INTERRUPT writes from the loaded checkpoint.
                # The fork will have a new checkpoint_id which changes
                # task IDs — stale interrupt writes would accumulate and
@@ -991,7 +1088,7 @@ class PregelLoop:
                manager=None,
                updated_channels=updated_channels,
            )
-            self._delta_channels_with_overwrite.update(
+            self._delta_channels_forced_snapshot.update(
                c
                for c, v in input_writes
                if isinstance(self.specs.get(c), DeltaChannel) and _get_overwrite(v)[0]
@@ -1017,7 +1114,9 @@ class PregelLoop:
            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))
+                        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":
@@ -1053,7 +1152,11 @@ class PregelLoop:
            replay_state: ReplayState | None = None
            if is_time_traveling:
                replay_checkpoint_id = self.checkpoint["id"]
-                if (
+                if replay_bound is not None:
+                    replay_checkpoint_id = replay_bound[CONF].get(
+                        CONFIG_KEY_CHECKPOINT_ID, replay_checkpoint_id
+                    )
+                elif (
                    self.checkpoint_metadata.get("source")
                    in (
                        "update",
@@ -1135,8 +1238,10 @@ class PregelLoop:
        )
        # create new checkpoint
        channels_to_snapshot = (
-            delta_channels_to_snapshot(self.channels, new_counters)
-            | self._delta_channels_with_overwrite
+            delta_channels_to_snapshot(
+                self.channels, new_counters, self.checkpoint["channel_versions"]
+            )
+            | self._delta_channels_forced_snapshot
            if do_checkpoint
            else set()
        )
@@ -1150,11 +1255,12 @@ class PregelLoop:
            if do_checkpoint
            else None,
            channels_to_snapshot=channels_to_snapshot,
+            stored_versions=self.checkpoint_previous_versions,
        )
        for k in channels_to_snapshot:
            new_counters[k] = (0, 0)
        if do_checkpoint:
-            self._delta_channels_with_overwrite.difference_update(channels_to_snapshot)
+            self._delta_channels_forced_snapshot.difference_update(channels_to_snapshot)
        non_zero = {k: v for k, v in new_counters.items() if v != (0, 0)}
        if non_zero:
            self.checkpoint_metadata["counters_since_delta_snapshot"] = non_zero
@@ -1196,12 +1302,17 @@ class PregelLoop:
            )
            self.checkpoint_previous_versions = channel_versions

+            # Take this checkpoint's writes now: saves run in the background
+            # and can start out of order, so a save that took them itself
+            # could get another checkpoint's writes.
+            delta_write_futs, self._delta_write_futs = self._delta_write_futs, []
            # save it, without blocking
            # if there's a previous checkpoint save in progress, wait for it
            # ensuring checkpointers receive checkpoints in order
            self._put_checkpoint_fut = self.submit(
                self._checkpointer_put_after_previous,
                getattr(self, "_put_checkpoint_fut", None),
+                delta_write_futs,
                self.checkpoint_config,
                copy_checkpoint(self.checkpoint),
                self.checkpoint_metadata,
@@ -1238,14 +1349,14 @@ class PregelLoop:
            self.checkpoint_metadata.get("counters_since_delta_snapshot") or {}
        )
        channels_to_snapshot = (
-            delta_channels_to_snapshot(self.channels, counters)
-            | self._delta_channels_with_overwrite
+            delta_channels_to_snapshot(
+                self.channels, counters, self.checkpoint["channel_versions"]
+            )
+            | self._delta_channels_forced_snapshot
        )

        pending = [
-            (step, tid, ch, v)
-            for (step, tid, ch, v) in self._exit_delta_writes
-            if ch not in channels_to_snapshot
+            w for w in self._exit_delta_writes if w[3] not in channels_to_snapshot
        ]
        if not pending:
            return
@@ -1271,6 +1382,7 @@ class PregelLoop:
            self._put_checkpoint_fut = self.submit(
                self._checkpointer_put_after_previous,
                getattr(self, "_put_checkpoint_fut", None),
+                (),
                stub_put_config,
                stub_cp,
                {"step": -2},
@@ -1280,11 +1392,21 @@ class PregelLoop:
            # 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))
+        # The checkpoint's own superstep keeps its real task paths, so it
+        # interleaves with the writes a resume loaded from it. Its task ids stay
+        # synthetic: under the real id, a run whose final checkpoint fails to
+        # save would leave the resumed task looking done to the next resume.
+        # Later supersteps sort after every real task path and task id, in step
+        # order, so this holds whether a saver orders by path or by id.
+        grouped: dict[tuple[str, str], list[tuple[str, Any]]] = {}
+        for step, tid, path, ch, v in pending:
+            if tid == NULL_TASK_ID:
+                key = (exit_delta_task_id(step, tid), "")
+            elif step == self._exit_first_step:
+                key = (exit_delta_task_id(step, tid), path)
+            else:
+                key = (exit_delta_late_task_id(step, tid), f"~~{step:010d}{path}")
+            grouped.setdefault(key, []).append((ch, v))
        anchor_write_config = patch_configurable(
            anchor_config,
            {
@@ -1294,22 +1416,21 @@ class PregelLoop:
                CONFIG_KEY_CHECKPOINT_ID: anchor_config[CONF][CONFIG_KEY_CHECKPOINT_ID],
            },
        )
-        for (step, tid), entries in grouped.items():
-            synth_tid = exit_delta_task_id(step, tid)
+        for (tid, path), entries in grouped.items():
            if self.checkpointer_put_writes_accepts_task_path:
                fut = self.submit(
                    self.checkpointer_put_writes,
                    anchor_write_config,
                    entries,
-                    synth_tid,
-                    "",
+                    tid,
+                    path,
                )
            else:
                fut = self.submit(
                    self.checkpointer_put_writes,
                    anchor_write_config,
                    entries,
-                    synth_tid,
+                    tid,
                )
            if self._delta_write_futs is not None:
                self._delta_write_futs.append(fut)
@@ -1518,8 +1639,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
            self.checkpointer_get_next_version = checkpointer.get_next_version
            self.checkpointer_put_writes = checkpointer.put_writes
            self.checkpointer_put_writes_accepts_task_path = (
-                signature(checkpointer.put_writes).parameters.get("task_path")
-                is not None
+                put_writes_accepts_task_path(checkpointer.put_writes)
            )
        else:
            self.checkpointer_get_next_version = increment
@@ -1530,21 +1650,19 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
    def _checkpointer_put_after_previous(
        self,
        prev: concurrent.futures.Future | None,
+        delta_write_futs: Sequence[concurrent.futures.Future],
        config: RunnableConfig,
        checkpoint: Checkpoint,
        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()
-        finally:
-            cast(BaseCheckpointSaver, self.checkpointer).put(
-                config, checkpoint, metadata, new_versions
-            )
+        for fut in delta_write_futs:
+            fut.result()
+        if prev is not None:
+            prev.result()
+        cast(BaseCheckpointSaver, self.checkpointer).put(
+            config, checkpoint, metadata, new_versions
+        )

    def match_cached_writes(self) -> Sequence[PregelExecutableTask]:
        if self.cache is None:
@@ -1600,7 +1718,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
        if handler_task is None:
            return None
        self.tasks[handler_task.id] = handler_task
-        if not self.is_replaying:
+        if self._reapplies_pending_writes:
            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)
@@ -1635,6 +1753,10 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
            # This covers both normal replay and subgraphs resolved via
            # checkpoint_map during time-travel.
            saved = self.checkpointer.get_tuple(self.checkpoint_config)
+            if saved is not None and saved.metadata.get("source") in ("update", "fork"):
+                self._addressed_checkpoint_superseded = checkpoint_superseded(
+                    self.checkpointer, self.checkpoint_config, saved
+                )
        elif replay_state := self.config[CONF].get(CONFIG_KEY_REPLAY_STATE):
            # Subgraph replay: the parent is replaying and passed us a
            # replay_state with its checkpoint_id. Look up our checkpoint
@@ -1684,7 +1806,6 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
        )
        self._delta_write_futs = []
        self._error_handler_write_futs = []
-        self._delta_channels_with_overwrite = set()
        self._exit_delta_writes = (
            [] if self.durability == "exit" and self.checkpointer is not None else None
        )
@@ -1771,8 +1892,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
            self.checkpointer_get_next_version = checkpointer.get_next_version
            self.checkpointer_put_writes = checkpointer.aput_writes
            self.checkpointer_put_writes_accepts_task_path = (
-                signature(checkpointer.aput_writes).parameters.get("task_path")
-                is not None
+                put_writes_accepts_task_path(checkpointer.aput_writes)
            )
        else:
            self.checkpointer_get_next_version = increment
@@ -1783,23 +1903,19 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
    async def _checkpointer_put_after_previous(
        self,
        prev: asyncio.Task | None,
+        delta_write_futs: Sequence[asyncio.Future],
        config: RunnableConfig,
        checkpoint: Checkpoint,
        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
-        finally:
-            await cast(BaseCheckpointSaver, self.checkpointer).aput(
-                config, checkpoint, metadata, new_versions
-            )
+        if delta_write_futs:
+            await asyncio.gather(*delta_write_futs)
+        if prev is not None:
+            await prev
+        await cast(BaseCheckpointSaver, self.checkpointer).aput(
+            config, checkpoint, metadata, new_versions
+        )

    async def amatch_cached_writes(self) -> Sequence[PregelExecutableTask]:
        if self.cache is None:
@@ -1855,7 +1971,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
        if handler_task is None:
            return None
        self.tasks[handler_task.id] = handler_task
-        if not self.is_replaying:
+        if self._reapplies_pending_writes:
            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)
@@ -1893,6 +2009,10 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
            # This covers both normal replay and subgraphs resolved via
            # checkpoint_map during time-travel.
            saved = await self.checkpointer.aget_tuple(self.checkpoint_config)
+            if saved is not None and saved.metadata.get("source") in ("update", "fork"):
+                self._addressed_checkpoint_superseded = await acheckpoint_superseded(
+                    self.checkpointer, self.checkpoint_config, saved
+                )
        elif replay_state := self.config[CONF].get(CONFIG_KEY_REPLAY_STATE):
            # Subgraph replay: the parent is replaying and passed us a
            # replay_state with its checkpoint_id. Look up our checkpoint
@@ -1942,7 +2062,6 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
        )
        self._delta_write_futs = []
        self._error_handler_write_futs = []
-        self._delta_channels_with_overwrite = set()
        self._exit_delta_writes = (
            [] if self.durability == "exit" and self.checkpointer is not None else None
        )
@@ -45,6 +45,7 @@ from langgraph.errors import GraphBubbleUp, GraphInterrupt
 from langgraph.pregel._algo import Call
 from langgraph.pregel._executor import Submit
 from langgraph.pregel._retry import arun_with_retry, run_with_retry
+from langgraph.pregel._task_status import CONTROL_WRITES
 from langgraph.types import (
    CachePolicy,
    PregelExecutableTask,
@@ -606,8 +607,9 @@ class PregelRunner:
                task.config is None or TAG_HIDDEN not in task.config.get("tags", [])
            ):
                self.node_finished(task.name)
-            if not task.writes:
-                # add no writes marker
+            if all(chan in CONTROL_WRITES for chan, _ in task.writes):
+                # record that the task finished, even if it produced no output
+                # (see `langgraph.pregel._task_status`)
                task.writes.append((NO_WRITES, None))
            # save task writes to checkpointer
            self.put_writes()(task.id, task.writes)  # type: ignore[misc]
@@ -0,0 +1,129 @@
+"""Read the status of each task from the writes recorded for a superstep.
+
+While a superstep is open, the checkpointer keeps a log of writes for each
+task in that step. Entries are added as tasks run and are only discarded when
+the whole superstep finishes and a new checkpoint is saved. When a task runs
+again, for example after being resumed, its earlier entries stay in the log.
+
+This module is the single place that turns that log into task status. Code that
+needs to know whether a task finished, which interrupts it raised, which of them
+are still waiting for an answer, or which output it produced must use
+`read_task_statuses` instead of inspecting the writes directly.
+
+The log uses two kinds of writes:
+
+- Control writes describe what happened to a task: `INTERRUPT` (the task asked
+  a question), `RESUME` (answers the task has received), `ERROR`, and
+  `ERROR_SOURCE_NODE`. `INTERRUPT`, `RESUME` and `ERROR` each have a fixed slot
+  per task (`WRITES_IDX_MAP`), so a newer write of the same kind can replace an
+  older one.
+- Every other write is output: channel writes, `RETURN` for functional tasks,
+  and the `NO_WRITES` marker.
+
+The rules are:
+
+1. When a task that ran finishes successfully, `PregelRunner.commit` records at
+   least one output write, adding `NO_WRITES` if the task produced no other
+   output.
+2. A task that pauses at an interrupt records only control writes.
+3. A task is therefore treated as finished if and only if it has an output
+   write.
+4. Because `INTERRUPT` is stored in a fixed slot, its recorded value is the most
+   recent question the task asked. That question is waiting for an answer only
+   while the task is unfinished.
+
+A `RESUME` write never means a task is finished: it can hold the answer to an
+earlier question while the task waits on a later one.
+
+What these rules cannot see:
+
+- A task whose result came from the cache does not go through
+  `PregelRunner.commit`, so nothing is recorded for it. It reads as not
+  finished.
+- A task that fails can record partial output writes along with its error. It
+  reads as finished, which is how the executor has always treated it.
+- Writes recorded before rule 1 existed may describe a finished task with no
+  output using only control writes. Those tasks read as unfinished. The
+  executor treated them the same way before and runs them again. Their last
+  interrupt now counts as pending, so they appear in `next` and a resume
+  without an interrupt id raises if another interrupt is also pending.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Iterable, Sequence
+from dataclasses import dataclass
+from typing import Any
+
+from langgraph.checkpoint.base import PendingWrite
+
+from langgraph._internal._constants import (
+    ERROR,
+    ERROR_SOURCE_NODE,
+    INTERRUPT,
+    NULL_TASK_ID,
+    RESUME,
+)
+from langgraph.types import Interrupt
+
+__all__ = ("CONTROL_WRITES", "TaskStatus", "read_task_statuses")
+
+CONTROL_WRITES = frozenset((ERROR, ERROR_SOURCE_NODE, INTERRUPT, RESUME))
+"""Channels that describe what happened to a task rather than what it produced."""
+
+
+@dataclass(frozen=True, slots=True)
+class TaskStatus:
+    """The status of one task, read from the writes recorded for its superstep."""
+
+    output: tuple[tuple[str, Any], ...] = ()
+    """Output writes in recorded order. Empty if the task has not finished."""
+
+    interrupts: tuple[Interrupt, ...] = ()
+    """The most recent interrupts the task raised, whether or not they were answered."""
+
+    error: BaseException | None = None
+    """The recorded error, if any."""
+
+    @property
+    def finished(self) -> bool:
+        """Whether the task ran to completion."""
+        return bool(self.output)
+
+    @property
+    def pending_interrupts(self) -> tuple[Interrupt, ...]:
+        """Interrupts waiting for an answer. Always empty for a finished task."""
+        return () if self.finished else self.interrupts
+
+
+def read_task_statuses(
+    pending_writes: Iterable[PendingWrite],
+) -> dict[str, TaskStatus]:
+    """Return the status of every task that has recorded writes, keyed by task id.
+
+    Writes from `NULL_TASK_ID` are input to the superstep, not task activity, so
+    they are not included.
+    """
+    output: dict[str, list[tuple[str, Any]]] = {}
+    interrupts: dict[str, list[Interrupt]] = {}
+    errors: dict[str, BaseException] = {}
+    for task_id, channel, value in pending_writes:
+        if task_id == NULL_TASK_ID:
+            continue
+        output.setdefault(task_id, [])
+        if channel == INTERRUPT:
+            interrupts.setdefault(task_id, []).extend(
+                value if isinstance(value, Sequence) else [value]
+            )
+        elif channel == ERROR:
+            errors.setdefault(task_id, value)
+        elif channel not in CONTROL_WRITES:
+            output[task_id].append((channel, value))
+    return {
+        task_id: TaskStatus(
+            output=tuple(task_output),
+            interrupts=tuple(interrupts.get(task_id, ())),
+            error=errors.get(task_id),
+        )
+        for task_id, task_output in output.items()
+    }
@@ -26,6 +26,7 @@ from langgraph._internal._typing import MISSING
 from langgraph.channels.base import BaseChannel
 from langgraph.constants import TAG_HIDDEN
 from langgraph.pregel._io import read_channels
+from langgraph.pregel._task_status import TaskStatus, read_task_statuses
 from langgraph.types import (
    CheckpointPayload,
    PregelExecutableTask,
@@ -37,6 +38,8 @@ from langgraph.types import (

 TASK_NAMESPACE = UUID("6ba7b831-9dad-11d1-80b4-00c04fd430c8")

+_NOT_STARTED = TaskStatus()
+

 def map_debug_tasks(tasks: Iterable[PregelExecutableTask]) -> Iterator[TaskPayload]:
    """Produce "task" events for stream_mode=debug."""
@@ -211,35 +214,21 @@ def tasks_w_writes(
    pending_writes: list[PendingWrite] | None,
    states: dict[str, RunnableConfig | StateSnapshot] | None,
    output_keys: str | Sequence[str],
+    *,
+    live: bool = False,
 ) -> tuple[PregelTask, ...]:
-    """Apply writes / subgraph states to tasks to be returned in a StateSnapshot."""
-    pending_writes = pending_writes or []
+    """Apply writes / subgraph states to tasks to be returned in a StateSnapshot.
+
+    With `live=True`, tasks report only the interrupts still waiting for an
+    answer, as of the most recent writes. Otherwise tasks report the interrupts
+    they raised in the step, including answered ones, as a record of the step.
+    """
+    statuses = read_task_statuses(pending_writes or [])
    out: list[PregelTask] = []
    for task in tasks:
-        rtn = next(
-            (
-                val
-                for tid, chan, val in pending_writes
-                if tid == task.id and chan == RETURN
-            ),
-            MISSING,
-        )
-        task_error = next(
-            (exc for tid, n, exc in pending_writes if tid == task.id and n == ERROR),
-            None,
-        )
-        task_interrupts = tuple(
-            v
-            for tid, n, vv in pending_writes
-            if tid == task.id and n == INTERRUPT
-            for v in (vv if isinstance(vv, Sequence) else [vv])
-        )
-
-        task_writes = [
-            (chan, val)
-            for tid, chan, val in pending_writes
-            if tid == task.id and chan not in (ERROR, INTERRUPT, RETURN)
-        ]
+        status = statuses.get(task.id, _NOT_STARTED)
+        rtn = next((val for chan, val in status.output if chan == RETURN), MISSING)
+        task_writes = [(chan, val) for chan, val in status.output if chan != RETURN]

        if rtn is not MISSING:
            task_result = rtn
@@ -261,19 +250,15 @@ def tasks_w_writes(
            mapped_writes = map_task_result_writes(filtered_writes)
            task_result = mapped_writes if filtered_writes else {}

-        has_writes = rtn is not MISSING or any(
-            w[0] == task.id and w[1] not in (ERROR, INTERRUPT) for w in pending_writes
-        )
-
        out.append(
            PregelTask(
                task.id,
                task.name,
                task.path,
-                task_error,
-                task_interrupts,
+                status.error,
+                status.pending_interrupts if live else status.interrupts,
                states.get(task.id) if states else None,
-                task_result if has_writes else None,
+                task_result if status.finished else None,
            )
        )
    return tuple(out)
@@ -726,7 +726,13 @@ class StateSnapshot(NamedTuple):
    tasks: tuple[PregelTask, ...]
    """Tasks to execute in this step. If already attempted, may contain an error."""
    interrupts: tuple[Interrupt, ...]
-    """Interrupts that occurred in this step that are pending resolution."""
+    """Interrupts that occurred in this step.
+
+    When reading the latest state (`get_state` without a `checkpoint_id`), this
+    contains only interrupts still waiting for an answer. When reading a specific
+    checkpoint or state history, it contains the most recent interrupt each task
+    raised in that step, including ones answered later in the same step.
+    """


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

 [project]
 name = "langgraph"
-version = "1.2.12"
+version = "1.2.14"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -25,8 +25,8 @@ classifiers = [
 ]
 dependencies = [
    "langchain-core>=1.4.7,<2",
-    "langgraph-checkpoint>=4.1.0,<5.0.0",
-    "langgraph-sdk>=0.4.2,<0.5.0",
+    "langgraph-checkpoint>=4.3.0,<5.0.0",
+    "langgraph-sdk>=0.4.6,<0.5.0",
    "langgraph-prebuilt>=1.1.0,<1.2.0",
    "xxhash>=3.5.0",
    "pydantic>=2.7.4",
@@ -85,11 +85,13 @@ class MemorySaverAssertImmutable(InMemorySaver):
                )
                == saved
            ), config["configurable"]["checkpoint_ns"]
+        next_config = super().put(config, checkpoint, metadata, new_versions)
+        # Read back, not the object handed in: a DeltaChannel a step did not
+        # write is refilled on read from the blob its inherited version points at.
        self.storage_for_copies[thread_id][checkpoint_ns][checkpoint["id"]] = (
-            self.serde.dumps_typed(checkpoint)
+            self.serde.dumps_typed(super().get(next_config))
        )
-        # call super to write checkpoint
-        return super().put(config, checkpoint, metadata, new_versions)
+        return next_config


 class MemorySaverNoPending(InMemorySaver):
@@ -6,11 +6,13 @@ channel), lazy stub creation when no parent exists, and proper read-path
 reconstruction via ancestor walks.
 """

+import operator
 import uuid
 from typing import Annotated, Any

 import pytest
 from langchain_core.messages import AIMessage, HumanMessage
+from langgraph.checkpoint.base import BaseCheckpointSaver
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from typing_extensions import TypedDict
@@ -19,6 +21,7 @@ from langgraph.channels.delta import DeltaChannel
 from langgraph.graph import START, StateGraph
 from langgraph.graph.message import _messages_delta_reducer
 from langgraph.pregel._checkpoint import exit_delta_task_id
+from langgraph.types import Command, Durability, interrupt

 pytestmark = pytest.mark.anyio

@@ -389,3 +392,197 @@ async def test_exit_snapshot_then_tail_deltas() -> None:
    assert "seed-msg" in contents
    assert "tail-msg" in contents
    assert contents.index("seed-msg") < contents.index("tail-msg")
+
+
+def _append(current: list, writes: list) -> list:
+    out = list(current)
+    for write in writes:
+        out.extend(write)
+    return out
+
+
+class _ResumeState(TypedDict):
+    log: Annotated[list, DeltaChannel(_append)]
+    plain: Annotated[list, operator.add]
+
+
+def _both(marker: str) -> dict:
+    return {"log": [marker], "plain": [marker]}
+
+
+def _ask(marker: str) -> Any:
+    def ask(state: _ResumeState) -> dict:
+        interrupt("approve?")
+        return _both(marker)
+
+    return ask
+
+
+@pytest.mark.parametrize("addressed", [False, True])
+def test_resume_after_a_parallel_interrupt_replays_in_live_order(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability, addressed: bool
+) -> None:
+    builder = StateGraph(_ResumeState)
+    builder.add_node("done", lambda state: _both("done"))
+    builder.add_node("ask", _ask("ask"))
+    builder.add_node("after", lambda state: _both("after"))
+    builder.add_edge(START, "done")
+    builder.add_edge(START, "ask")
+    builder.add_edge("ask", "after")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability=durability)
+    head = graph.get_state(config).config
+
+    graph.invoke(
+        Command(resume="yes"), head if addressed else config, durability=durability
+    )
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"]
+    assert sorted(state.values["log"]) == ["after", "ask", "done", "in"]
+
+
+def test_resume_with_a_command_update_replays_its_write_once(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    builder = StateGraph(_ResumeState)
+    builder.add_node("done", lambda state: _both("done"))
+    builder.add_node("ask", _ask("ask"))
+    builder.add_edge(START, "done")
+    builder.add_edge(START, "ask")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability=durability)
+
+    graph.invoke(
+        Command(resume="yes", update=_both("cmd")), config, durability=durability
+    )
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "cmd", "ask", "done"]
+
+
+class _FlagState(_ResumeState, total=False):
+    extra: Annotated[list, DeltaChannel(_append)]
+    flag: bool
+
+
+def test_addressed_resume_keeps_a_rerun_tasks_write_to_a_new_channel(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    def done(state: _FlagState) -> dict:
+        return {**_both("done"), **({"extra": ["new"]} if state.get("flag") else {})}
+
+    builder = StateGraph(_FlagState)
+    builder.add_node("done", done)
+    builder.add_node("ask", _ask("ask"))
+    builder.add_edge(START, "done")
+    builder.add_edge(START, "ask")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability=durability)
+    head = graph.get_state(config).config
+
+    live = graph.invoke(
+        Command(resume="yes", update={"flag": True}), head, durability=durability
+    )
+
+    state = graph.get_state(config)
+    assert live["extra"] == state.values["extra"] == ["new"]
+    assert state.values["log"] == state.values["plain"]
+
+
+def test_resume_interleaves_the_resumed_superstep_by_task_path(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    builder = StateGraph(_ResumeState)
+    builder.add_node("z_done", lambda state: _both("z"))
+    builder.add_node("a_asks", _ask("a"))
+    builder.add_edge(START, "z_done")
+    builder.add_edge(START, "a_asks")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability=durability)
+
+    graph.invoke(Command(resume="yes"), config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "z"]
+
+
+class _TaskIdOrderSaver(InMemorySaver):
+    """Replays each checkpoint's writes by task id, as savers without task path
+    ordering do."""
+
+    def get_tuple(self, config: Any) -> Any:
+        tup = super().get_tuple(config)
+        if tup and tup.pending_writes:
+            tup = tup._replace(pending_writes=sorted(tup.pending_writes))
+        return tup
+
+    get_delta_channel_history = BaseCheckpointSaver.get_delta_channel_history
+
+
+def test_exit_run_replays_supersteps_in_order_on_a_task_id_ordered_saver() -> None:
+    builder = StateGraph(_ResumeState)
+    builder.add_node("a", lambda state: _both("a"))
+    builder.add_node("b", lambda state: _both("b"))
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    graph = builder.compile(checkpointer=_TaskIdOrderSaver())
+    config = {"configurable": {"thread_id": "t"}}
+
+    graph.invoke(_both("in"), config, durability="exit")
+
+    assert graph.get_state(config).values["log"] == ["in", "a", "b"]
+
+
+def test_exit_resume_replays_supersteps_in_order_on_a_task_id_ordered_saver() -> None:
+    builder = StateGraph(_ResumeState)
+    builder.add_node("ask", _ask("ask"))
+    builder.add_node("after", lambda state: _both("after"))
+    builder.add_edge(START, "ask")
+    builder.add_edge("ask", "after")
+    graph = builder.compile(checkpointer=_TaskIdOrderSaver())
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability="exit")
+
+    graph.invoke(Command(resume="yes"), config, durability="exit")
+
+    assert graph.get_state(config).values["log"] == ["in", "ask", "after"]
+
+
+class _FailingPutSaver(InMemorySaver):
+    fail = False
+
+    def put(
+        self, config: Any, checkpoint: Any, metadata: Any, new_versions: Any
+    ) -> Any:
+        if self.fail:
+            raise RuntimeError("final checkpoint lost")
+        return super().put(config, checkpoint, metadata, new_versions)
+
+
+def test_exit_resume_retried_after_its_final_checkpoint_fails_reruns_the_resumed_task() -> (
+    None
+):
+    saver = _FailingPutSaver()
+    builder = StateGraph(_ResumeState)
+    builder.add_node("done", lambda state: _both("done"))
+    builder.add_node("ask", _ask("ask"))
+    builder.add_edge(START, "done")
+    builder.add_edge(START, "ask")
+    graph = builder.compile(checkpointer=saver)
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke(_both("in"), config, durability="exit")
+    saver.fail = True
+    with pytest.raises(RuntimeError, match="final checkpoint lost"):
+        graph.invoke(Command(resume="yes"), config, durability="exit")
+    saver.fail = False
+
+    graph.invoke(Command(resume="yes"), config, durability="exit")
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"]
+    assert sorted(state.values["plain"]) == ["ask", "done", "in"]
@@ -0,0 +1,982 @@
+"""Forking a thread must not replay the abandoned branch into the fork.
+
+Every graph carries a `DeltaChannel` and a plain reducer channel fed the same
+values; the plain channel needs no replay, so it is the oracle.
+"""
+
+import sys
+import threading
+from collections.abc import Sequence
+from operator import add
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import BaseCheckpointSaver
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from typing_extensions import TypedDict
+
+from langgraph._internal._constants import INPUT
+from langgraph.channels.delta import DeltaChannel
+from langgraph.errors import NodeError
+from langgraph.graph import END, START, StateGraph
+from langgraph.types import (
+    Command,
+    Durability,
+    Send,
+    StateSnapshot,
+    StateUpdate,
+    interrupt,
+)
+
+pytestmark = pytest.mark.anyio
+NEEDS_CONTEXTVARS = pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
+
+
+def _append(current: list | None, writes: Sequence[Any]) -> list:
+    out = list(current or [])
+    for write in writes:
+        out.extend(write if isinstance(write, list) else [write])
+    return out
+
+
+class _State(TypedDict):
+    log: Annotated[list, DeltaChannel(_append, snapshot_frequency=1000)]
+    plain: Annotated[list, add]
+    other: Annotated[list, add]
+
+
+def _build(checkpointer: BaseCheckpointSaver, tag: str) -> Any:
+    def node(state: _State) -> dict:
+        return {"log": [f"{tag}-out"], "plain": [f"{tag}-out"]}
+
+    builder = StateGraph(_State)
+    builder.add_node("n", node)
+    builder.set_entry_point("n")
+    builder.set_finish_point("n")
+    return builder.compile(checkpointer=checkpointer)
+
+
+def _build_without_delta_writes(checkpointer: BaseCheckpointSaver, tag: str) -> Any:
+    def node(state: _State) -> dict:
+        return {"other": [f"{tag}-other"]}
+
+    builder = StateGraph(_State)
+    builder.add_node("n", node)
+    builder.set_entry_point("n")
+    builder.set_finish_point("n")
+    return builder.compile(checkpointer=checkpointer)
+
+
+def _thread(thread_id: str) -> RunnableConfig:
+    return {"configurable": {"thread_id": thread_id}}
+
+
+def _at(config: RunnableConfig, snapshot: StateSnapshot) -> RunnableConfig:
+    return {
+        "configurable": {
+            **config["configurable"],
+            "checkpoint_ns": "",
+            "checkpoint_id": snapshot.config["configurable"]["checkpoint_id"],
+        }
+    }
+
+
+def _both(marker: str) -> dict:
+    return {"log": [marker], "plain": [marker]}
+
+
+def _snapshotted_checkpoints(
+    checkpointer: BaseCheckpointSaver, config: RunnableConfig
+) -> list[str]:
+    return [
+        tuple_.config["configurable"]["checkpoint_id"]
+        for tuple_ in checkpointer.list(config)
+        if isinstance(tuple_.checkpoint["channel_values"].get("log"), _DeltaSnapshot)
+    ]
+
+
+def _assert_fork_is_clean(state: StateSnapshot, abandoned: str) -> None:
+    assert state.values["log"] == state.values["plain"], (
+        f"delta channel diverged from the plain channel: "
+        f"{state.values['log']} != {state.values['plain']}"
+    )
+    assert abandoned not in state.values["log"], (
+        f"{abandoned!r} belongs to the branch the fork replaced, "
+        f"but was replayed into {state.values['log']}"
+    )
+
+
+def test_fork_by_invoke(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    _build(sync_checkpointer, "first").invoke(
+        _both("in-1"), config, durability=durability
+    )
+    graph = _build(sync_checkpointer, "second")
+    graph.invoke(_both("in-2"), config, durability=durability)
+    abandoned_head = graph.get_state(config)
+
+    base = next(
+        snapshot
+        for snapshot in graph.get_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+    )
+    _build(sync_checkpointer, "third").invoke(
+        _both("in-3"), _at(config, base), durability=durability
+    )
+
+    state = graph.get_state(config)
+    _assert_fork_is_clean(state, "in-2")
+    assert state.values["log"] == [*base.values["log"], "in-3", "third-out"]
+
+    abandoned = graph.get_state(abandoned_head.config).values
+    assert abandoned["log"] == abandoned["plain"] == abandoned_head.values["log"]
+
+
+async def test_afork_by_invoke(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    await _build(async_checkpointer, "first").ainvoke(
+        _both("in-1"), config, durability=durability
+    )
+    graph = _build(async_checkpointer, "second")
+    await graph.ainvoke(_both("in-2"), config, durability=durability)
+    abandoned_head = await graph.aget_state(config)
+
+    base = await anext(
+        snapshot
+        async for snapshot in graph.aget_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+    )
+    await _build(async_checkpointer, "third").ainvoke(
+        _both("in-3"), _at(config, base), durability=durability
+    )
+
+    state = await graph.aget_state(config)
+    _assert_fork_is_clean(state, "in-2")
+    assert state.values["log"] == [*base.values["log"], "in-3", "third-out"]
+
+    abandoned = (await graph.aget_state(abandoned_head.config)).values
+    assert abandoned["log"] == abandoned["plain"] == abandoned_head.values["log"]
+
+
+def test_fork_off_checkpoint_before_first_input(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config, durability=durability)
+
+    root = list(graph.get_state_history(config))[-1]
+    assert root.values["log"] == []
+
+    _build(sync_checkpointer, "third").invoke(
+        _both("in-9"), _at(config, root), durability=durability
+    )
+
+    state = graph.get_state(config)
+    _assert_fork_is_clean(state, "in-1")
+    assert state.values["log"] == ["in-9", "third-out"]
+
+
+async def test_afork_off_checkpoint_before_first_input(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(async_checkpointer, "first")
+    await graph.ainvoke(_both("in-1"), config, durability=durability)
+
+    root = [snapshot async for snapshot in graph.aget_state_history(config)][-1]
+    assert root.values["log"] == []
+
+    await _build(async_checkpointer, "third").ainvoke(
+        _both("in-9"), _at(config, root), durability=durability
+    )
+
+    state = await graph.aget_state(config)
+    _assert_fork_is_clean(state, "in-1")
+    assert state.values["log"] == ["in-9", "third-out"]
+
+
+def test_fork_by_update_state(sync_checkpointer: BaseCheckpointSaver) -> None:
+    config = _thread("t")
+    _build(sync_checkpointer, "first").invoke(_both("in-1"), config)
+    graph = _build(sync_checkpointer, "second")
+    graph.invoke(_both("in-2"), config)
+
+    base = next(
+        snapshot
+        for snapshot in graph.get_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+    )
+    forked = graph.update_state(_at(config, base), _both("patched"))
+
+    state = graph.get_state(forked)
+    _assert_fork_is_clean(state, "in-2")
+    assert state.values["log"] == [*base.values["log"], "patched"]
+
+
+async def test_afork_by_update_state(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    await _build(async_checkpointer, "first").ainvoke(_both("in-1"), config)
+    graph = _build(async_checkpointer, "second")
+    await graph.ainvoke(_both("in-2"), config)
+
+    base = await anext(
+        snapshot
+        async for snapshot in graph.aget_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+    )
+    forked = await graph.aupdate_state(_at(config, base), _both("patched"))
+
+    state = await graph.aget_state(forked)
+    _assert_fork_is_clean(state, "in-2")
+    assert state.values["log"] == [*base.values["log"], "patched"]
+
+
+def _assert_branch_unchanged(state: StateSnapshot, expected: list, edit: str) -> None:
+    assert state.values["log"] == state.values["plain"] == expected, (
+        f"{edit!r} was written by an update_state on this branch's base, "
+        f"but this branch now reads {state.values['log']}"
+    )
+
+
+# The old checkpoint is either a finished turn, which saved no writes, or one
+# whose next node already ran there, so the edit reuses that task's id.
+@pytest.mark.parametrize("next_node_ran", [False, True])
+def test_update_state_on_an_old_checkpoint_leaves_its_other_branch_alone(
+    sync_checkpointer: BaseCheckpointSaver, next_node_ran: bool
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config)
+    _build(sync_checkpointer, "second").invoke(_both("in-2"), config)
+    branch = graph.get_state(config)
+    base = next(
+        snapshot
+        for snapshot in graph.get_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+        and snapshot.next == (("n",) if next_node_ran else ())
+    )
+
+    edited = graph.update_state(_at(config, base), _both("edit"), as_node="n")
+
+    _assert_branch_unchanged(
+        graph.get_state(branch.config), branch.values["log"], "edit"
+    )
+    assert graph.get_state(edited).values["log"] == [*base.values["log"], "edit"]
+
+    _build(sync_checkpointer, "third").invoke(_both("in-3"), branch.config)
+    _assert_branch_unchanged(
+        graph.get_state(config),
+        [*branch.values["log"], "in-3", "third-out"],
+        "edit",
+    )
+
+
+@pytest.mark.parametrize("next_node_ran", [False, True])
+async def test_aupdate_state_on_an_old_checkpoint_leaves_its_other_branch_alone(
+    async_checkpointer: BaseCheckpointSaver, next_node_ran: bool
+) -> None:
+    config = _thread("t")
+    graph = _build(async_checkpointer, "first")
+    await graph.ainvoke(_both("in-1"), config)
+    await _build(async_checkpointer, "second").ainvoke(_both("in-2"), config)
+    branch = await graph.aget_state(config)
+    base = await anext(
+        snapshot
+        async for snapshot in graph.aget_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+        and snapshot.next == (("n",) if next_node_ran else ())
+    )
+
+    edited = await graph.aupdate_state(_at(config, base), _both("edit"), as_node="n")
+
+    _assert_branch_unchanged(
+        await graph.aget_state(branch.config), branch.values["log"], "edit"
+    )
+    assert (await graph.aget_state(edited)).values["log"] == [
+        *base.values["log"],
+        "edit",
+    ]
+
+    await _build(async_checkpointer, "third").ainvoke(_both("in-3"), branch.config)
+    _assert_branch_unchanged(
+        await graph.aget_state(config),
+        [*branch.values["log"], "in-3", "third-out"],
+        "edit",
+    )
+
+
+def test_bulk_update_on_an_old_checkpoint_leaves_its_other_branch_alone(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config)
+    base = graph.get_state(config)
+    _build(sync_checkpointer, "second").invoke(_both("in-2"), config)
+    branch = graph.get_state(config)
+
+    edited = graph.bulk_update_state(
+        _at(config, base),
+        [[StateUpdate(_both("s1"), "n")], [StateUpdate(_both("s2"), "n")]],
+    )
+
+    _assert_branch_unchanged(graph.get_state(branch.config), branch.values["log"], "s1")
+    assert graph.get_state(edited).values["log"] == [*base.values["log"], "s1", "s2"]
+
+
+@pytest.mark.parametrize(
+    "edit", [_both("edit"), {"other": ["edit"]}], ids=["delta_and_plain", "plain_only"]
+)
+def test_clearing_an_old_checkpoint_does_not_pick_up_an_edit_of_it(
+    sync_checkpointer: BaseCheckpointSaver, edit: dict
+) -> None:
+    graph = (
+        StateGraph(_State)
+        .add_node("a", lambda state: _both("a"))
+        .add_node("b", lambda state: _both("b"))
+        .add_edge(START, "a")
+        .add_edge("a", "b")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = _thread("t")
+    graph.invoke(_both("in"), config, interrupt_before=["b"])
+    base = graph.get_state(config)
+    graph.update_state(config, _both("later"), as_node="a")
+    graph.update_state(base.config, edit, as_node="b")
+
+    cleared = graph.update_state(base.config, None, as_node=END)
+
+    values = graph.get_state(cleared).values
+    assert values["log"] == values["plain"] == ["in", "a"]
+    assert values["other"] == []
+
+
+def test_clearing_a_checkpoint_after_editing_it_keeps_the_edit_in_both_channels(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    def q(state: _State) -> dict:
+        interrupt("continue?")
+        return _both("q")
+
+    graph = (
+        StateGraph(_State)
+        .add_node("p", lambda state: _both("p"))
+        .add_node("q", q)
+        .add_edge(START, "p")
+        .add_edge(START, "q")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = _thread("t")
+    graph.invoke(_both("in"), config)
+    head = graph.get_state(config)
+    graph.update_state(head.config, _both("edit"), as_node="q")
+
+    cleared = graph.update_state(head.config, None, as_node=END)
+
+    state = graph.get_state(cleared)
+    assert state.values["log"] == state.values["plain"] == ["in", "p", "edit"]
+
+
+def test_update_state_with_the_head_checkpoint_id_stores_no_snapshot(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config)
+    for i in range(3):
+        graph.update_state(graph.get_state(config).config, _both(f"u{i}"))
+
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+    assert graph.get_state(config).values["log"] == [
+        "in-1",
+        "first-out",
+        "u0",
+        "u1",
+        "u2",
+    ]
+
+
+def test_unaddressed_run_keeps_snapshot_cadence(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config, durability=durability)
+    graph.invoke(_both("in-2"), config, durability=durability)
+
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def test_fork_before_first_value_when_fork_never_writes_the_channel(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config, durability=durability)
+
+    root = list(graph.get_state_history(config))[-1]
+    assert root.values["log"] == []
+
+    _build_without_delta_writes(sync_checkpointer, "third").invoke(
+        {"other": ["in-9"]}, _at(config, root), durability=durability
+    )
+
+    state = graph.get_state(config)
+    _assert_fork_is_clean(state, "in-1")
+    assert state.values["log"] == []
+
+
+async def test_afork_before_first_value_when_fork_never_writes_the_channel(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(async_checkpointer, "first")
+    await graph.ainvoke(_both("in-1"), config, durability=durability)
+
+    root = [snapshot async for snapshot in graph.aget_state_history(config)][-1]
+    assert root.values["log"] == []
+
+    await _build_without_delta_writes(async_checkpointer, "third").ainvoke(
+        {"other": ["in-9"]}, _at(config, root), durability=durability
+    )
+
+    state = await graph.aget_state(config)
+    _assert_fork_is_clean(state, "in-1")
+    assert state.values["log"] == []
+
+
+def test_fork_before_first_value_by_bulk_update(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config)
+
+    root = list(graph.get_state_history(config))[-1]
+    assert root.values["log"] == []
+
+    forked = graph.bulk_update_state(
+        _at(config, root),
+        [
+            [StateUpdate({"other": ["s1"]}, "n")],
+            [StateUpdate(_both("s2"), "n")],
+        ],
+    )
+
+    state = graph.get_state(forked)
+    _assert_fork_is_clean(state, "in-1")
+    assert state.values["log"] == ["s2"]
+
+
+@pytest.mark.parametrize("first_as_node", [INPUT, END, "__copy__"])
+def test_fork_by_bulk_update_whose_first_superstep_is_not_a_node(
+    sync_checkpointer: BaseCheckpointSaver, first_as_node: str
+) -> None:
+    config = _thread("t")
+    _build(sync_checkpointer, "first").invoke(_both("in-1"), config)
+    graph = _build(sync_checkpointer, "second")
+    graph.invoke(_both("in-2"), config)
+
+    base = next(
+        snapshot
+        for snapshot in graph.get_state_history(config)
+        if "in-2" not in snapshot.values["log"]
+    )
+    first = (
+        StateUpdate(_both("first-step"), first_as_node)
+        if first_as_node == INPUT
+        else StateUpdate(None, first_as_node)
+    )
+    forked = graph.bulk_update_state(
+        _at(config, base),
+        [[first], [StateUpdate(_both("second-step"), "n")]],
+    )
+
+    state = graph.get_state(forked)
+    assert state.values["log"] == state.values["plain"], (
+        f"delta channel diverged from the plain channel: "
+        f"{state.values['log']} != {state.values['plain']}"
+    )
+
+
+def test_bulk_update_after_a_copy_stores_no_snapshot(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    _build(sync_checkpointer, "first").invoke(_both("in-1"), config)
+    graph = _build(sync_checkpointer, "second")
+    graph.invoke(_both("in-2"), config)
+    base = next(
+        s for s in graph.get_state_history(config) if "in-2" not in s.values["log"]
+    )
+
+    forked = graph.bulk_update_state(
+        _at(config, base),
+        [[StateUpdate(None, "__copy__")], [StateUpdate(_both("s2"), "n")]],
+    )
+
+    assert graph.get_state(forked).values["log"] == ["in-1", "first-out", "s2"]
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def test_unaddressed_bulk_update_keeps_snapshot_cadence(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "first")
+    graph.invoke(_both("in-1"), config)
+
+    graph.bulk_update_state(
+        config,
+        [[StateUpdate(_both(f"u{i}"), "n")] for i in range(4)],
+    )
+
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def _build_two_steps(checkpointer: BaseCheckpointSaver, subgraph: bool) -> Any:
+    if subgraph:
+        inner = StateGraph(_State)
+        inner.add_node("b1", lambda state: _both("b1"))
+        inner.add_node("b2", lambda state: _both("b2"))
+        inner.add_edge(START, "b1")
+        inner.add_edge("b1", "b2")
+        second: Any = inner.compile()
+    else:
+        second = lambda state: _both("b")  # noqa: E731
+    builder = StateGraph(_State)
+    builder.add_node("a", lambda state: _both("a"))
+    builder.add_node("b", second)
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    return builder.compile(checkpointer=checkpointer)
+
+
+@pytest.mark.parametrize(
+    "replay_input", [None, Command(update=_both("cmd"))], ids=["none", "command"]
+)
+@pytest.mark.parametrize("subgraph", [False, True])
+def test_replay_from_an_edit_the_thread_moved_past_leaves_its_branch_alone(
+    sync_checkpointer: BaseCheckpointSaver,
+    durability: Durability,
+    subgraph: bool,
+    replay_input: Command | None,
+) -> None:
+    graph = _build_two_steps(sync_checkpointer, subgraph)
+    config = _thread("t")
+    graph.invoke(_both("in-1"), config, durability=durability)
+    edit = graph.update_state(config, _both("edit"), as_node="a")
+    graph.invoke(_both("in-2"), config, durability=durability)
+    branch = graph.get_state(config)
+
+    graph.invoke(replay_input, edit, durability=durability)
+
+    after = graph.get_state(branch.config).values
+    assert after["log"] == after["plain"] == branch.values["log"], (
+        f"a replay from the edit wrote into the branch that already grew from it: "
+        f"{after['log']}"
+    )
+    replay = graph.get_state(config).values
+    assert replay["log"] == replay["plain"]
+
+
+@pytest.mark.parametrize(
+    "replay_input", [None, Command(update=_both("cmd"))], ids=["none", "command"]
+)
+@pytest.mark.parametrize("subgraph", [False, True])
+async def test_areplay_from_an_edit_the_thread_moved_past_leaves_its_branch_alone(
+    async_checkpointer: BaseCheckpointSaver,
+    durability: Durability,
+    subgraph: bool,
+    replay_input: Command | None,
+) -> None:
+    graph = _build_two_steps(async_checkpointer, subgraph)
+    config = _thread("t")
+    await graph.ainvoke(_both("in-1"), config, durability=durability)
+    edit = await graph.aupdate_state(config, _both("edit"), as_node="a")
+    await graph.ainvoke(_both("in-2"), config, durability=durability)
+    branch = await graph.aget_state(config)
+
+    await graph.ainvoke(replay_input, edit, durability=durability)
+
+    after = (await graph.aget_state(branch.config)).values
+    assert after["log"] == after["plain"] == branch.values["log"], (
+        f"a replay from the edit wrote into the branch that already grew from it: "
+        f"{after['log']}"
+    )
+    replay = (await graph.aget_state(config)).values
+    assert replay["log"] == replay["plain"]
+
+
+@pytest.mark.parametrize(
+    "command",
+    [Command(update=_both("cmd")), Command(goto="a")],
+    ids=["update", "goto"],
+)
+def test_command_replay_of_an_old_checkpoint_stores_nothing_on_it(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability, command: Command
+) -> None:
+    graph = _build_two_steps(sync_checkpointer, subgraph=False)
+    config = _thread("t")
+    graph.invoke(_both("in"), config, interrupt_before=["b"], durability=durability)
+    old = graph.get_state(config)
+    graph.invoke(None, config, durability=durability)
+    branch = graph.get_state(config)
+
+    graph.invoke(command, old.config, durability=durability)
+
+    after = graph.get_state(branch.config).values
+    assert after["log"] == after["plain"] == branch.values["log"]
+    graph.invoke(None, old.config, durability=durability)
+    replay = graph.get_state(config).values
+    assert replay["log"] == replay["plain"] == ["in", "a", "b"], (
+        f"a later replay of the checkpoint repeated the earlier Command: {replay}"
+    )
+
+
+def _build_paused_before_b(checkpointer: BaseCheckpointSaver) -> Any:
+    builder = StateGraph(_State)
+    builder.add_node("a", lambda state: _both("a"))
+    builder.add_node("b", lambda state: _both("b"))
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    builder.add_edge("b", END)
+    return builder.compile(checkpointer=checkpointer, interrupt_before=["b"])
+
+
+def _build_parallel_interrupt(checkpointer: BaseCheckpointSaver) -> Any:
+    def ask(state: _State) -> dict:
+        interrupt("approve?")
+        return {"other": ["q"]}
+
+    builder = StateGraph(_State)
+    builder.add_node("p", lambda state: _both("p"))
+    builder.add_node("q", ask)
+    builder.add_edge(START, "p")
+    builder.add_edge(START, "q")
+    return builder.compile(checkpointer=checkpointer)
+
+
+def test_resume_at_interrupt_before_with_the_head_checkpoint_id_runs_the_node(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build_paused_before_b(sync_checkpointer)
+    graph.invoke(_both("in"), config, durability=durability)
+
+    graph.invoke(None, graph.get_state(config).config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.next == (), f"resume paused again before {state.next}"
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "b"]
+
+
+async def test_aresume_at_interrupt_before_with_the_head_checkpoint_id_runs_the_node(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build_paused_before_b(async_checkpointer)
+    await graph.ainvoke(_both("in"), config, durability=durability)
+
+    await graph.ainvoke(
+        None, (await graph.aget_state(config)).config, durability=durability
+    )
+
+    state = await graph.aget_state(config)
+    assert state.next == (), f"resume paused again before {state.next}"
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "b"]
+
+
+def test_replay_from_a_paused_checkpoint_runs_the_node_once(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build_paused_before_b(sync_checkpointer)
+    graph.invoke(_both("in"), config)
+    paused = graph.get_state(config).config
+    graph.invoke(None, config)
+
+    graph.invoke(None, paused)
+
+    state = graph.get_state(config)
+    assert state.next == (), f"replay paused again before {state.next}"
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "b"]
+
+
+@pytest.mark.parametrize("addressed", [False, True])
+def test_new_input_on_an_interrupted_head_does_not_replay_its_pending_writes(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability, addressed: bool
+) -> None:
+    config = _thread("t")
+    graph = _build_parallel_interrupt(sync_checkpointer)
+    graph.invoke(_both("in-1"), config, durability=durability)
+    head = graph.get_state(config).config
+
+    graph.invoke(_both("in-2"), head if addressed else config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in-1", "in-2", "p"]
+
+
+def _build_deferred_after_interrupt(checkpointer: BaseCheckpointSaver) -> Any:
+    builder = StateGraph(_State)
+    builder.add_node("a", lambda state: _both("a"))
+    builder.add_node("b", lambda state: _both("b"), defer=True)
+    builder.add_node("c", lambda state: {})
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    builder.add_edge("a", "c")
+    return builder.compile(checkpointer=checkpointer, interrupt_after=["a"])
+
+
+def test_resume_on_an_interrupted_head_consumes_its_writes_without_a_snapshot(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build_parallel_interrupt(sync_checkpointer)
+    graph.invoke(_both("in-1"), config, durability=durability)
+
+    graph.invoke(Command(resume="yes"), config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.next == ()
+    assert state.values["log"] == state.values["plain"] == ["in-1", "p"]
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def test_resume_whose_node_writes_the_delta_channel_stores_no_snapshot(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    def ask(state: _State) -> dict:
+        return _both(interrupt("continue?"))
+
+    graph = (
+        StateGraph(_State)
+        .add_node("ask", ask)
+        .add_edge(START, "ask")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = _thread("t")
+    graph.invoke(_both("in"), config, durability=durability)
+
+    graph.invoke(Command(resume="yes"), config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "yes"]
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def test_resume_after_interrupt_before_stores_no_snapshot(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "n")
+    graph.invoke(_both("in"), config, interrupt_before=["n"], durability=durability)
+
+    graph.invoke(None, config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "n-out"]
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+
+
+def _build_send_fan_out(checkpointer: BaseCheckpointSaver) -> Any:
+    def q(state: _State) -> dict:
+        interrupt("continue?")
+        return _both("q")
+
+    builder = StateGraph(_State)
+    builder.add_node("p", lambda state: _both("p"))
+    builder.add_node("q", q)
+    builder.add_conditional_edges(
+        START, lambda state: [Send("p", state), Send("q", state)], ["p", "q"]
+    )
+    return builder.compile(checkpointer=checkpointer)
+
+
+def test_resume_that_replaces_the_pending_sends_drops_the_finished_task(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    graph = _build_send_fan_out(sync_checkpointer)
+    config = _thread("t")
+    graph.invoke(_both("in"), config, durability=durability)
+
+    live = graph.invoke(
+        Command(resume="yes", goto=[Send("q", _both("unused"))]),
+        config,
+        durability=durability,
+    )
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == live["log"], (
+        f"'p' ran in the fan-out the resume replaced, but the reload reads "
+        f"{state.values['log']} against the live {live['log']}"
+    )
+
+
+@NEEDS_CONTEXTVARS
+async def test_aresume_that_replaces_the_pending_sends_drops_the_finished_task(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    graph = _build_send_fan_out(async_checkpointer)
+    config = _thread("t")
+    await graph.ainvoke(_both("in"), config, durability=durability)
+
+    live = await graph.ainvoke(
+        Command(resume="yes", goto=[Send("q", _both("unused"))]),
+        config,
+        durability=durability,
+    )
+
+    state = await graph.aget_state(config)
+    assert state.values["log"] == state.values["plain"] == live["log"], (
+        f"'p' ran in the fan-out the resume replaced, but the reload reads "
+        f"{state.values['log']} against the live {live['log']}"
+    )
+
+
+def test_replay_interrupted_in_its_first_step_still_seals_the_fork(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    graph = _build_send_fan_out(sync_checkpointer)
+    config = _thread("t")
+    graph.invoke(_both("in"), config, durability=durability)
+
+    graph.invoke(None, graph.get_state(config).config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "p"], (
+        f"the replay reran p, so the fork must not also replay the first p, "
+        f"but it reads {state.values['log']}"
+    )
+
+
+@NEEDS_CONTEXTVARS
+async def test_areplay_interrupted_in_its_first_step_still_seals_the_fork(
+    async_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    graph = _build_send_fan_out(async_checkpointer)
+    config = _thread("t")
+    await graph.ainvoke(_both("in"), config, durability=durability)
+
+    await graph.ainvoke(
+        None, (await graph.aget_state(config)).config, durability=durability
+    )
+
+    state = await graph.aget_state(config)
+    assert state.values["log"] == state.values["plain"] == ["in", "p"], (
+        f"the replay reran p, so the fork must not also replay the first p, "
+        f"but it reads {state.values['log']}"
+    )
+
+
+def test_resume_addressed_at_an_interrupted_head_reruns_its_tasks_once(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    config = _thread("t")
+    graph = _build_parallel_interrupt(sync_checkpointer)
+    graph.invoke(_both("in-1"), config, durability=durability)
+
+    graph.invoke(
+        Command(resume="yes"), graph.get_state(config).config, durability=durability
+    )
+
+    state = graph.get_state(config)
+    assert state.next == ()
+    assert state.values["log"] == state.values["plain"] == ["in-1", "p"]
+
+
+def test_update_state_with_the_head_checkpoint_id_keeps_a_deferred_node(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_deferred_after_interrupt(sync_checkpointer)
+    config = _thread("t")
+    graph.invoke(_both("in"), config)
+
+    graph.update_state(graph.get_state(config).config, _both("u"), as_node="c")
+    graph.invoke(None, config)
+
+    state = graph.get_state(config)
+    assert state.next == (), f"deferred node never ran, still pending: {state.next}"
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "u", "b"]
+
+
+async def test_aupdate_state_with_the_head_checkpoint_id_keeps_a_deferred_node(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_deferred_after_interrupt(async_checkpointer)
+    config = _thread("t")
+    await graph.ainvoke(_both("in"), config)
+
+    await graph.aupdate_state(
+        (await graph.aget_state(config)).config, _both("u"), as_node="c"
+    )
+    await graph.ainvoke(None, config)
+
+    state = await graph.aget_state(config)
+    assert state.next == (), f"deferred node never ran, still pending: {state.next}"
+    assert state.values["log"] == state.values["plain"] == ["in", "a", "u", "b"]
+
+
+def test_turns_addressed_at_the_head_store_no_snapshot(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    config = _thread("t")
+    graph = _build(sync_checkpointer, "turn")
+    graph.invoke(_both("in-1"), config)
+    for turn in range(2, 5):
+        graph.invoke(_both(f"in-{turn}"), graph.get_state(config).config)
+
+    assert not _snapshotted_checkpoints(sync_checkpointer, config)
+    assert (
+        graph.get_state(config).values["log"] == graph.get_state(config).values["plain"]
+    )
+
+
+def test_resume_that_reruns_an_error_handler_drops_its_stored_writes(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    handled = threading.Event()
+    attempts = {"c": 0}
+
+    def fails(state: _State) -> dict:
+        raise RuntimeError("f always fails")
+
+    def handler(state: _State, error: NodeError) -> dict:
+        handled.set()
+        return _both("h")
+
+    def flaky(state: _State) -> dict:
+        attempts["c"] += 1
+        if attempts["c"] == 1:
+            assert handled.wait(5)
+            raise ValueError("c fails once")
+        return _both("c")
+
+    graph = (
+        StateGraph(_State)
+        .add_node("f", fails, error_handler=handler)
+        .add_node("c", flaky)
+        .add_edge(START, "f")
+        .add_edge(START, "c")
+        .compile(checkpointer=sync_checkpointer)
+    )
+    config = _thread("t")
+    with pytest.raises(ValueError):
+        graph.invoke(_both("in"), config, durability=durability)
+
+    live = graph.invoke(None, config, durability=durability)
+
+    state = graph.get_state(config)
+    assert state.values["log"] == state.values["plain"] == live["log"]
@@ -0,0 +1,126 @@
+"""`DeltaChannel` replay must apply parallel writes in the order `invoke` did."""
+
+import asyncio
+from typing import Annotated, Any
+
+import pytest
+from langgraph.checkpoint.base import BaseCheckpointSaver
+from typing_extensions import TypedDict
+
+from langgraph.channels.delta import DeltaChannel
+from langgraph.graph import END, START, StateGraph
+from langgraph.types import Send
+
+pytestmark = pytest.mark.anyio
+
+# Sorted, because live execution applies PULL tasks in node-name order.
+FAN_OUT_NAMES = ["a", "b", "c", "d", "e", "f", "g", "h"]
+SEND_ARGS = [f"send-{i:02d}" for i in range(12)]
+
+
+def _append_reducer(current: list, updates: list) -> list:
+    return [*current, *(x for u in updates for x in u)]
+
+
+def _build_fan_out_graph(checkpointer: BaseCheckpointSaver) -> Any:
+    class State(TypedDict):
+        items: Annotated[
+            list, DeltaChannel(_append_reducer, list, snapshot_frequency=10_000)
+        ]
+
+    def make_node(label: str) -> Any:
+        return lambda state: {"items": [label]}
+
+    builder = StateGraph(State)
+    for name in FAN_OUT_NAMES:
+        builder.add_node(name, make_node(name))
+        builder.add_edge(START, name)
+        builder.add_edge(name, END)
+    return builder.compile(checkpointer=checkpointer)
+
+
+def _build_send_fan_out_graph(checkpointer: BaseCheckpointSaver) -> Any:
+    class State(TypedDict):
+        items: Annotated[
+            list, DeltaChannel(_append_reducer, list, snapshot_frequency=10_000)
+        ]
+
+    builder = StateGraph(State)
+    builder.add_node("worker", lambda arg: {"items": [arg]})
+    builder.add_conditional_edges(
+        START, lambda state: [Send("worker", n) for n in SEND_ARGS]
+    )
+    builder.add_edge("worker", END)
+    return builder.compile(checkpointer=checkpointer)
+
+
+async def test_get_state_matches_live_send_order(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_send_fan_out_graph(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+
+    live = (await graph.ainvoke({"items": []}, config))["items"]
+    replayed = (await graph.aget_state(config)).values["items"]
+
+    assert live == SEND_ARGS
+    assert replayed == live
+
+
+async def test_get_state_matches_live_invoke_order(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_fan_out_graph(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+
+    live = (await graph.ainvoke({"items": []}, config))["items"]
+    replayed = (await graph.aget_state(config)).values["items"]
+
+    assert live == FAN_OUT_NAMES
+    assert replayed == live
+
+
+async def test_sync_get_state_on_async_saver_matches_live_order(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_fan_out_graph(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+
+    live = (await graph.ainvoke({"items": []}, config))["items"]
+    replayed = (await asyncio.to_thread(graph.get_state, config)).values["items"]
+
+    assert replayed == live
+
+
+async def test_continuing_thread_preserves_committed_prefix(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_fan_out_graph(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+
+    first = (await graph.ainvoke({"items": []}, config))["items"]
+    second = (await graph.ainvoke({"items": []}, config))["items"]
+
+    assert second == first + first
+    assert (await graph.aget_state(config)).values["items"] == second
+
+
+async def test_state_history_reports_live_order_at_every_step(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    runs = 3
+    graph = _build_fan_out_graph(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    for _ in range(runs):
+        await graph.ainvoke({"items": []}, config)
+    live = FAN_OUT_NAMES * runs
+
+    seen = [
+        s.values["items"]
+        async for s in graph.aget_state_history(config)
+        if "items" in s.values
+    ]
+
+    assert max(map(len, seen)) == len(live)
+    for values in seen:
+        assert values == live[: len(values)], f"{values} is not a prefix of {live}"
@@ -0,0 +1,496 @@
+import operator
+from typing import Annotated, Any, Literal
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import BaseCheckpointSaver
+from langgraph.checkpoint.memory import InMemorySaver
+from typing_extensions import TypedDict
+
+from langgraph._internal._constants import CONFIG_KEY_CHECKPOINTER
+from langgraph.channels.delta import DeltaChannel
+from langgraph.graph import END, START, StateGraph
+from langgraph.pregel._checkpoint import (
+    achannels_from_checkpoint,
+    channels_from_checkpoint,
+    empty_checkpoint,
+)
+
+pytestmark = pytest.mark.anyio
+
+
+def _extend(state: list | None, writes: list[Any]) -> list:
+    out = list(state or [])
+    for write in writes:
+        out.extend(write if isinstance(write, list) else [write])
+    return out
+
+
+def _state_schema(snapshot_frequency: int = 1000) -> type:
+    class State(TypedDict, total=False):
+        delta: Annotated[
+            list, DeltaChannel(_extend, snapshot_frequency=snapshot_frequency)
+        ]
+        plain: Annotated[list, operator.add]
+
+    return State
+
+
+def _both(*items: str) -> dict:
+    return {"delta": list(items), "plain": list(items)}
+
+
+def _child_builder(*, snapshot_frequency: int = 1000) -> StateGraph:
+    builder = StateGraph(_state_schema(snapshot_frequency))
+    builder.add_node("a", lambda state: _both("a1"))
+    builder.add_node("b", lambda state: _both("b1", "b2"))
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    builder.add_edge("b", END)
+    return builder
+
+
+def _wrap(
+    inner: StateGraph,
+    *,
+    checkpointer: bool | None = None,
+    interrupt_before: list[str] | None = None,
+) -> StateGraph:
+    builder = StateGraph(inner.state_schema)
+    builder.add_node(
+        "child",
+        inner.compile(checkpointer=checkpointer, interrupt_before=interrupt_before),
+    )
+    builder.add_edge(START, "child")
+    builder.add_edge("child", END)
+    return builder
+
+
+def _nested_app(
+    checkpointer: BaseCheckpointSaver,
+    *,
+    depth: int = 1,
+    snapshot_frequency: int = 1000,
+    pause_before_b: bool = False,
+    subgraph_checkpointer: bool | None = None,
+) -> Any:
+    graph = _child_builder(snapshot_frequency=snapshot_frequency)
+    for _ in range(depth):
+        graph = _wrap(
+            graph,
+            checkpointer=subgraph_checkpointer,
+            interrupt_before=["b"] if pause_before_b else None,
+        )
+    return graph.compile(checkpointer=checkpointer)
+
+
+def _scoped(config: dict, namespace: str) -> dict:
+    return {"configurable": {**config["configurable"], "checkpoint_ns": namespace}}
+
+
+def _child_namespace(app: Any, config: dict, *, depth: int = 1) -> str:
+    namespace = ""
+    for level in range(depth):
+        scoped = _scoped(config, namespace) if namespace else config
+        namespace = next(
+            (
+                task.state["configurable"]["checkpoint_ns"]
+                for snapshot in app.get_state_history(scoped)
+                for task in snapshot.tasks
+                if task.name == "child" and isinstance(task.state, dict)
+            ),
+            "",
+        )
+        assert namespace, f"no `child` subgraph task at nesting level {level}"
+    return namespace
+
+
+async def _achild_namespace(app: Any, config: dict) -> str:
+    async for snapshot in app.aget_state_history(config):
+        for task in snapshot.tasks:
+            if task.name == "child" and isinstance(task.state, dict):
+                return task.state["configurable"]["checkpoint_ns"]
+    raise AssertionError("no `child` subgraph task")
+
+
+HISTORY = [_both("a1", "b1", "b2"), _both("a1"), _both(), _both()]
+
+
+def test_subgraph_get_state(sync_checkpointer: BaseCheckpointSaver) -> None:
+    app = _nested_app(sync_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    child = _scoped(config, _child_namespace(app, config))
+
+    assert app.get_state(config).values == _both("a1", "b1", "b2")
+    assert app.get_state(child).values == _both("a1", "b1", "b2")
+
+
+async def test_subgraph_aget_state(async_checkpointer: BaseCheckpointSaver) -> None:
+    app = _nested_app(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+
+    child = _scoped(config, await _achild_namespace(app, config))
+
+    assert (await app.aget_state(child)).values == _both("a1", "b1", "b2")
+
+
+def test_subgraph_get_state_history(sync_checkpointer: BaseCheckpointSaver) -> None:
+    app = _nested_app(sync_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    child = _scoped(config, _child_namespace(app, config))
+
+    assert [s.values for s in app.get_state_history(child)] == HISTORY
+
+
+async def test_subgraph_aget_state_history(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(async_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+
+    child = _scoped(config, await _achild_namespace(app, config))
+
+    assert [s.values async for s in app.aget_state_history(child)] == HISTORY
+
+
+def test_doubly_nested_subgraph_get_state(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(sync_checkpointer, depth=2)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    child = _scoped(config, _child_namespace(app, config, depth=2))
+
+    assert app.get_state(child).values == _both("a1", "b1", "b2")
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+def test_interrupted_subgraph_task_state(
+    sync_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        sync_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    (task,) = app.get_state(config, subgraphs=True).tasks
+
+    assert task.state.values == _both("a1")
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+async def test_interrupted_subgraph_task_state_async(
+    async_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        async_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+
+    (task,) = (await app.aget_state(config, subgraphs=True)).tasks
+
+    assert task.state.values == _both("a1")
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+def test_interrupted_subgraph_history_from_its_task_config(
+    sync_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        sync_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+    (task,) = app.get_state(config).tasks
+
+    history = list(app.get_state_history(task.state))
+
+    assert [snapshot.values for snapshot in history][:1] == [_both("a1")]
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+async def test_interrupted_subgraph_ahistory_from_its_task_config(
+    async_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        async_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+    (task,) = (await app.aget_state(config)).tasks
+
+    history = [snapshot async for snapshot in app.aget_state_history(task.state)]
+
+    assert [snapshot.values for snapshot in history][:1] == [_both("a1")]
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+def test_interrupted_subgraph_update_state_from_its_task_config(
+    sync_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        sync_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+    (task,) = app.get_state(config).tasks
+
+    app.update_state(task.state, _both("edit"), as_node="a")
+
+    (task,) = app.get_state(config, subgraphs=True).tasks
+    assert task.state.values == _both("a1", "edit")
+
+
+@pytest.mark.parametrize("persistence", ["per-invocation", "per-thread"])
+async def test_interrupted_subgraph_aupdate_state_from_its_task_config(
+    async_checkpointer: BaseCheckpointSaver,
+    persistence: Literal["per-invocation", "per-thread"],
+) -> None:
+    app = _nested_app(
+        async_checkpointer,
+        pause_before_b=True,
+        subgraph_checkpointer=True if persistence == "per-thread" else None,
+    )
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+    (task,) = (await app.aget_state(config)).tasks
+
+    await app.aupdate_state(task.state, _both("edit"), as_node="a")
+
+    (task,) = (await app.aget_state(config, subgraphs=True)).tasks
+    assert task.state.values == _both("a1", "edit")
+
+
+def test_subgraph_update_state_keeps_history(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(sync_checkpointer, snapshot_frequency=2)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    child = _scoped(config, _child_namespace(app, config))
+    app.update_state(child, _both("manual"))
+
+    assert app.get_state(child).values == _both("a1", "b1", "b2", "manual")
+
+
+async def test_subgraph_aupdate_state_keeps_history(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(async_checkpointer, snapshot_frequency=2)
+    config = {"configurable": {"thread_id": "1"}}
+    await app.ainvoke({}, config)
+
+    child = _scoped(config, await _achild_namespace(app, config))
+    await app.aupdate_state(child, _both("manual"))
+
+    assert (await app.aget_state(child)).values == _both("a1", "b1", "b2", "manual")
+
+
+def test_stateless_subgraph_persists_nothing(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(sync_checkpointer, subgraph_checkpointer=False)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    child_tasks = [
+        task
+        for snapshot in app.get_state_history(config)
+        for task in snapshot.tasks
+        if task.name == "child" and isinstance(task.state, dict)
+    ]
+
+    assert child_tasks == []
+    assert app.get_state(config).values == _both("a1", "b1", "b2")
+
+
+def test_completed_subgraph_exposes_no_task_state(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _nested_app(sync_checkpointer)
+    config = {"configurable": {"thread_id": "1"}}
+    app.invoke({}, config)
+
+    assert app.get_state(config, subgraphs=True).tasks == ()
+
+
+def _written_delta_checkpoint() -> Any:
+    checkpoint = empty_checkpoint()
+    checkpoint["channel_versions"]["delta"] = 1
+    return checkpoint
+
+
+def test_hydrating_written_delta_channel_without_saver_raises() -> None:
+    with pytest.raises(ValueError, match="no checkpointer"):
+        channels_from_checkpoint(
+            {"delta": DeltaChannel(_extend)}, _written_delta_checkpoint()
+        )
+
+
+async def test_ahydrating_written_delta_channel_without_saver_raises() -> None:
+    with pytest.raises(ValueError, match="no checkpointer"):
+        await achannels_from_checkpoint(
+            {"delta": DeltaChannel(_extend)}, _written_delta_checkpoint()
+        )
+
+
+def test_hydrating_written_delta_channel_without_config_raises() -> None:
+    with pytest.raises(ValueError, match="no checkpointer"):
+        channels_from_checkpoint(
+            {"delta": DeltaChannel(_extend)},
+            _written_delta_checkpoint(),
+            saver=InMemorySaver(),
+        )
+
+
+def test_hydrating_unwritten_delta_channel_without_saver_is_empty() -> None:
+    channels, _ = channels_from_checkpoint(
+        {"delta": DeltaChannel(_extend)}, empty_checkpoint()
+    )
+    assert channels["delta"].get() == []
+
+
+def test_root_checkpointer_true_graph_state_read_raises() -> None:
+    app = _child_builder().compile(checkpointer=True)
+    with pytest.raises(RuntimeError, match="checkpointer=True cannot be used"):
+        app.get_state({"configurable": {"thread_id": "1"}})
+
+
+def test_stateless_graph_update_state_ignores_lent_saver() -> None:
+    saver = InMemorySaver()
+    app = _child_builder().compile(checkpointer=False)
+    config = {
+        "configurable": {
+            "thread_id": "1",
+            "checkpoint_ns": "child:1",
+            CONFIG_KEY_CHECKPOINTER: saver,
+        }
+    }
+    with pytest.raises(ValueError, match="No checkpointer set"):
+        app.update_state(config, _both("x"), as_node="a")
+    assert list(saver.list(None)) == []
+
+
+def test_graph_without_a_checkpointer_reads_through_a_lent_saver(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _child_builder().compile()
+    config = {
+        "configurable": {"thread_id": "1", CONFIG_KEY_CHECKPOINTER: sync_checkpointer}
+    }
+    app.invoke(_both("in"), config)
+
+    assert app.get_state(config).values == _both("in", "a1", "b1", "b2")
+    app.update_state(config, _both("edit"), as_node="b")
+    assert app.get_state(config).values == _both("in", "a1", "b1", "b2", "edit")
+    assert next(iter(app.get_state_history(config))).values == _both(
+        "in", "a1", "b1", "b2", "edit"
+    )
+
+
+async def test_graph_without_a_checkpointer_areads_through_a_lent_saver(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    app = _child_builder().compile()
+    config = {
+        "configurable": {"thread_id": "1", CONFIG_KEY_CHECKPOINTER: async_checkpointer}
+    }
+    await app.ainvoke(_both("in"), config)
+
+    assert (await app.aget_state(config)).values == _both("in", "a1", "b1", "b2")
+    await app.aupdate_state(config, _both("edit"), as_node="b")
+    assert (await app.aget_state(config)).values == _both(
+        "in", "a1", "b1", "b2", "edit"
+    )
+    history = [s async for s in app.aget_state_history(config)]
+    assert history[0].values == _both("in", "a1", "b1", "b2", "edit")
+
+
+def test_second_call_of_a_checkpointer_true_subgraph_reads_its_own_history(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    child = _child_builder().compile(checkpointer=True)
+
+    def node(state: dict) -> dict:
+        child.invoke(_both("first"))
+        child.invoke(_both("second"))
+        return {}
+
+    builder = StateGraph(_state_schema())
+    builder.add_node("node", node)
+    builder.add_edge(START, "node")
+    builder.compile(checkpointer=sync_checkpointer).invoke(
+        _both(), {"configurable": {"thread_id": "1"}}
+    )
+
+    def read(namespace: str) -> dict:
+        return child.get_state(
+            {
+                "configurable": {
+                    "thread_id": "1",
+                    "checkpoint_ns": namespace,
+                    CONFIG_KEY_CHECKPOINTER: sync_checkpointer,
+                }
+            }
+        ).values
+
+    assert read("node") == _both("first", "a1", "b1", "b2")
+    assert read("node|1") == _both("second", "a1", "b1", "b2")
+
+
+async def test_second_call_of_a_checkpointer_true_subgraph_areads_its_own_history(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    child = _child_builder().compile(checkpointer=True)
+
+    async def node(state: dict, config: RunnableConfig) -> dict:
+        await child.ainvoke(_both("first"), config)
+        await child.ainvoke(_both("second"), config)
+        return {}
+
+    builder = StateGraph(_state_schema())
+    builder.add_node("node", node)
+    builder.add_edge(START, "node")
+    await builder.compile(checkpointer=async_checkpointer).ainvoke(
+        _both(), {"configurable": {"thread_id": "1"}}
+    )
+
+    async def read(namespace: str) -> dict:
+        snapshot = await child.aget_state(
+            {
+                "configurable": {
+                    "thread_id": "1",
+                    "checkpoint_ns": namespace,
+                    CONFIG_KEY_CHECKPOINTER: async_checkpointer,
+                }
+            }
+        )
+        return snapshot.values
+
+    assert await read("node") == _both("first", "a1", "b1", "b2")
+    assert await read("node|1") == _both("second", "a1", "b1", "b2")
@@ -16,6 +16,7 @@ from typing_extensions import TypedDict
 from langgraph.channels.delta import DeltaChannel
 from langgraph.graph import END, START, StateGraph
 from langgraph.pregel._checkpoint import delta_channels_to_snapshot
+from langgraph.types import Command, interrupt

 pytestmark = pytest.mark.anyio

@@ -94,6 +95,28 @@ async def test_forced_snapshot_single_run() -> None:
        assert "seed-a" in state.values["a"]


+async def test_supersteps_bound_skips_a_channel_never_written() -> None:
+    with patch(
+        "langgraph.pregel._checkpoint.DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT",
+        3,
+    ):
+        saver = InMemorySaver()
+        graph = _build_two_channel_graph(saver, n_loops=4)
+        config = {"configurable": {"thread_id": "never-written"}}
+
+        graph.invoke({"a": ["seed-a"]}, config)
+
+        minted = [
+            t.config["configurable"]["checkpoint_id"]
+            for t in saver.list(config)
+            if "b" in t.checkpoint["channel_versions"]
+        ]
+        assert not minted, (
+            f"b was never written, but {len(minted)} checkpoints minted it a version"
+        )
+        assert graph.get_state(config).values["b"] == []
+
+
 async def test_forced_snapshot_accumulates_across_runs() -> None:
    """Supersteps counter for an unwritten channel persists across separate
    invoke() calls. After enough runs, the channel is force-snapshotted."""
@@ -139,13 +162,126 @@ async def test_predicate_fires_on_supersteps_overflow() -> None:
    channels = {"x": ch_instance}
    counters: dict[str, tuple[int, int]] = {"x": (0, 5000)}

-    result = delta_channels_to_snapshot(channels, counters)
+    result = delta_channels_to_snapshot(channels, counters, {"x": 1})
    assert "x" in result

    counters_below: dict[str, tuple[int, int]] = {"x": (0, 4999)}
-    result2 = delta_channels_to_snapshot(channels, counters_below)
+    result2 = delta_channels_to_snapshot(channels, counters_below, {"x": 1})
    assert "x" not in result2

+    assert not delta_channels_to_snapshot(channels, counters, {}), (
+        "a channel with no version was never written, so it has nothing to snapshot"
+    )
+
+
+def _delta_counters(saver: InMemorySaver, config: Any) -> dict[str, list[int]]:
+    tup = saver.get_tuple(config)
+    assert tup is not None
+    counters = tup.metadata.get("counters_since_delta_snapshot") or {}
+    return {ch: list(c) for ch, c in counters.items()}
+
+
+_CLEAR_COPY_AND_INPUT_UPDATES = pytest.mark.parametrize(
+    ("values", "as_node", "supersteps"),
+    [
+        (None, END, 1),
+        (None, "__copy__", 0),
+        ({"a": []}, "__input__", 1),
+    ],
+    ids=["clear as END", "copy", "update as input"],
+)
+
+
+@_CLEAR_COPY_AND_INPUT_UPDATES
+def test_update_state_path_keeps_delta_counters(
+    values: Any, as_node: str, supersteps: int
+) -> None:
+    saver = InMemorySaver()
+    graph = _build_two_channel_graph(saver)
+    config = {"configurable": {"thread_id": "counters"}}
+    graph.invoke({"a": ["seed-a"], "b": ["seed-b"]}, config)
+    before = _delta_counters(saver, config)
+    assert set(before) == {"a", "b"}, f"both channels need live counters: {before}"
+
+    updated = graph.update_state(config, values, as_node=as_node)
+
+    assert _delta_counters(saver, updated) == {
+        ch: [u, s + supersteps] for ch, (u, s) in before.items()
+    }
+
+
+@_CLEAR_COPY_AND_INPUT_UPDATES
+async def test_aupdate_state_path_keeps_delta_counters(
+    values: Any, as_node: str, supersteps: int
+) -> None:
+    saver = InMemorySaver()
+    graph = _build_two_channel_graph(saver)
+    config = {"configurable": {"thread_id": "counters"}}
+    await graph.ainvoke({"a": ["seed-a"], "b": ["seed-b"]}, config)
+    before = _delta_counters(saver, config)
+    assert set(before) == {"a", "b"}, f"both channels need live counters: {before}"
+
+    updated = await graph.aupdate_state(config, values, as_node=as_node)
+
+    assert _delta_counters(saver, updated) == {
+        ch: [u, s + supersteps] for ch, (u, s) in before.items()
+    }
+
+
+_UPDATES_THAT_ADD_A_SUPERSTEP = pytest.mark.parametrize(
+    ("values", "as_node"),
+    [(None, END), ({"a": []}, "__input__")],
+    ids=["clear as END", "update as input"],
+)
+
+
+@_UPDATES_THAT_ADD_A_SUPERSTEP
+def test_update_state_path_snapshots_at_the_supersteps_bound(
+    values: Any, as_node: str
+) -> None:
+    saver = InMemorySaver()
+    graph = _build_two_channel_graph(saver)
+    config = {"configurable": {"thread_id": "bound"}}
+    graph.invoke({"a": ["seed-a"], "b": ["seed-b"]}, config)
+    expected = graph.get_state(config).values
+    supersteps = _delta_counters(saver, config)["b"][1]
+
+    with patch(
+        "langgraph.pregel._checkpoint.DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT",
+        supersteps + 1,
+    ):
+        updated = graph.update_state(config, values, as_node=as_node)
+
+    head = saver.get_tuple(updated)
+    assert head is not None
+    assert isinstance(head.checkpoint["channel_values"].get("b"), _DeltaSnapshot)
+    assert "b" not in _delta_counters(saver, updated)
+    assert graph.get_state(updated).values == expected
+
+
+@_UPDATES_THAT_ADD_A_SUPERSTEP
+async def test_aupdate_state_path_snapshots_at_the_supersteps_bound(
+    values: Any, as_node: str
+) -> None:
+    saver = InMemorySaver()
+    graph = _build_two_channel_graph(saver)
+    config = {"configurable": {"thread_id": "bound"}}
+    await graph.ainvoke({"a": ["seed-a"], "b": ["seed-b"]}, config)
+    expected = (await graph.aget_state(config)).values
+    supersteps = _delta_counters(saver, config)["b"][1]
+
+    with patch(
+        "langgraph.pregel._checkpoint.DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT",
+        supersteps + 1,
+    ):
+        updated = await graph.aupdate_state(config, values, as_node=as_node)
+
+    head = saver.get_tuple(updated)
+    assert head is not None
+    assert isinstance(head.checkpoint["channel_values"].get("b"), _DeltaSnapshot)
+    assert "b" not in _delta_counters(saver, updated)
+    assert (await graph.aget_state(updated)).values == expected
+

 async def test_counter_reset_after_supersteps_snapshot() -> None:
    """After the supersteps bound triggers a snapshot, the counters for
@@ -193,3 +329,78 @@ async def test_counter_reset_after_supersteps_snapshot() -> None:

        state = graph.get_state(config)
        assert state.values["b"] == ["seed-b"]
+
+
+class _HistoryRequestSaver(InMemorySaver):
+    def __init__(self) -> None:
+        super().__init__()
+        self.requested: list[list[str]] = []
+
+    def get_delta_channel_history(self, *, config: Any, channels: Any) -> Any:
+        self.requested.append(sorted(channels))
+        return super().get_delta_channel_history(config=config, channels=channels)
+
+
+def test_never_written_channel_is_not_walked() -> None:
+    saver = _HistoryRequestSaver()
+    graph = _build_two_channel_graph(saver, n_loops=3)
+    config = {"configurable": {"thread_id": "never-written"}}
+    graph.invoke({"a": ["seed-a"]}, config)
+    saver.requested.clear()
+
+    graph.invoke({"a": ["more-a"]}, config)
+    state = graph.get_state(config)
+
+    assert state.values["b"] == []
+    assert saver.requested and all(r == ["a"] for r in saver.requested), (
+        f"only the written channel needs a walk; asked for {saver.requested}"
+    )
+
+
+async def test_anever_written_channel_is_not_walked() -> None:
+    saver = _HistoryRequestSaver()
+    graph = _build_two_channel_graph(saver, n_loops=3)
+    config = {"configurable": {"thread_id": "never-written"}}
+    await graph.ainvoke({"a": ["seed-a"]}, config)
+    saver.requested.clear()
+
+    await graph.ainvoke({"a": ["more-a"]}, config)
+    state = await graph.aget_state(config)
+
+    assert state.values["b"] == []
+    assert saver.requested and all(r == ["a"] for r in saver.requested), (
+        f"only the written channel needs a walk; asked for {saver.requested}"
+    )
+
+
+@pytest.mark.parametrize("durability", ["sync", "async"])
+def test_first_write_pending_at_an_interrupt_is_applied_once_on_resume(
+    durability: Any,
+) -> None:
+    class State(TypedDict):
+        x: list
+        first: Annotated[list, DeltaChannel(_simple_reducer)]
+
+    def ask(state: State) -> dict:
+        interrupt("ok?")
+        return {"x": ["asked"]}
+
+    saver = InMemorySaver()
+    graph = (
+        StateGraph(State)
+        .add_node("p", lambda state: {"first": ["p"]})
+        .add_node("ask", ask)
+        .add_edge(START, "p")
+        .add_edge(START, "ask")
+        .compile(checkpointer=saver)
+    )
+    config = {"configurable": {"thread_id": "pending-first-write"}}
+    graph.invoke({"x": ["in"]}, config, durability=durability)
+    head = saver.get_tuple(config)
+    assert head is not None
+    assert "first" not in head.checkpoint["channel_versions"]
+    assert ("first", ["p"]) in [w[1:] for w in head.pending_writes or []]
+
+    graph.invoke(Command(resume="yes"), config, durability=durability)
+
+    assert graph.get_state(config).values["first"] == ["p"]
@@ -20,6 +20,7 @@ from typing import Annotated, Any

 import pytest
 from langchain_core.messages import HumanMessage
+from langgraph.checkpoint.base import BaseCheckpointSaver
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from typing_extensions import TypedDict
@@ -27,16 +28,17 @@ from typing_extensions import TypedDict
 from langgraph.channels.delta import DeltaChannel
 from langgraph.graph import START, StateGraph
 from langgraph.graph.message import _messages_delta_reducer
-from langgraph.types import StateUpdate
+from langgraph.types import StateSnapshot, StateUpdate

 pytestmark = pytest.mark.anyio


 def _build_graph(
-    checkpointer: InMemorySaver,
+    checkpointer: BaseCheckpointSaver,
    *,
    two_nodes: bool = False,
    snapshot_frequency: int = 1000,
+    interrupt_before: list[str] | None = None,
 ) -> Any:
    """Compile a minimal DeltaChannel-backed `messages` graph.

@@ -63,7 +65,7 @@ def _build_graph(
        builder.set_finish_point("assistant")
    else:
        builder.set_finish_point("model")
-    return builder.compile(checkpointer=checkpointer)
+    return builder.compile(checkpointer=checkpointer, interrupt_before=interrupt_before)


 # ---------------------------------------------------------------------------
@@ -113,6 +115,37 @@ def test_fresh_update_state_head_snapshots_delta_channel() -> None:
    assert "counters_since_delta_snapshot" not in head.metadata


+def test_fresh_update_state_stores_nothing_for_a_delta_channel_it_did_not_write() -> (
+    None
+):
+    saver = InMemorySaver()
+    State = TypedDict(  # type: ignore[call-overload]  # noqa: UP013
+        "State",
+        {
+            "messages": Annotated[list, DeltaChannel(_messages_delta_reducer)],
+            "notes": Annotated[list, DeltaChannel(_messages_delta_reducer)],
+        },
+    )
+    graph = (
+        StateGraph(State)
+        .add_node("model", lambda state: {})
+        .add_edge(START, "model")
+        .compile(checkpointer=saver)
+    )
+    config = {"configurable": {"thread_id": "fresh-unwritten"}}
+
+    graph.update_state(
+        config,
+        {"messages": [HumanMessage(content="hello", id="m1")]},
+        as_node="model",
+    )
+
+    head = saver.get_tuple(config)
+    assert head is not None
+    assert "notes" not in head.checkpoint["channel_versions"]
+    assert graph.get_state(config).values["notes"] == []
+
+
 # ---------------------------------------------------------------------------
 # Non-fresh thread: update_state after invoke
 # ---------------------------------------------------------------------------
@@ -273,15 +306,14 @@ def test_bulk_update_state_multi_task_per_superstep_delta_channel() -> None:
    that each call `put_writes`. Guards the regression where moving
    `put_writes` outside the per-task loop would persist only the last
    task's writes.
-
-    Explicit `task_id`s are required to disambiguate writes belonging to
-    different `StateUpdate`s targeting the same node — otherwise both share
-    the deterministic interrupt-derived id and collide in the saver.
    """

    saver = InMemorySaver()
    graph = _build_graph(saver)
    config = {"configurable": {"thread_id": "bulk-multi-task"}}
+    graph.invoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+    base = saver.get_tuple(config)
+    assert base is not None

    graph.bulk_update_state(
        config,
@@ -301,13 +333,155 @@ def test_bulk_update_state_multi_task_per_superstep_delta_channel() -> None:
        ],
    )

+    stored = saver.get_tuple(base.config)
+    assert stored is not None
+    assert {task_id for task_id, _, _ in stored.pending_writes or []} == {
+        "task-1",
+        "task-2",
+    }, "explicit task ids must key the stored writes"
    state = graph.get_state(config)
    contents = [m.content for m in state.values["messages"]]
    ids = [m.id for m in state.values["messages"]]
-    assert sorted(contents) == ["first", "second"], (
+    assert sorted(contents) == ["first", "hi", "second"], (
        f"both updates' writes must persist; got {contents}"
    )
-    assert sorted(ids) == ["m1", "m2"]
+    assert sorted(ids) == ["hi", "m1", "m2"]
+
+
+def _update(content: str, as_node: str) -> StateUpdate:
+    return StateUpdate(
+        values={"messages": [HumanMessage(content=content, id=content)]},
+        as_node=as_node,
+    )
+
+
+def _contents(state: StateSnapshot) -> list[str]:
+    return [m.content for m in state.values["messages"]]
+
+
+def test_bulk_update_state_keeps_every_update_without_task_ids(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_graph(sync_checkpointer, two_nodes=True)
+    config = {"configurable": {"thread_id": "bulk-no-task-ids"}}
+    graph.invoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+
+    graph.bulk_update_state(
+        config,
+        [
+            [
+                _update("first", "model"),
+                _update("second", "model"),
+                _update("third", "assistant"),
+            ]
+        ],
+    )
+
+    contents = _contents(graph.get_state(config))
+    assert sorted(contents) == ["first", "hi", "second", "third"], (
+        f"every update's writes must persist; got {contents}"
+    )
+
+
+async def test_abulk_update_state_keeps_every_update_without_task_ids(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_graph(async_checkpointer, two_nodes=True)
+    config = {"configurable": {"thread_id": "bulk-no-task-ids"}}
+    await graph.ainvoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+
+    await graph.abulk_update_state(
+        config,
+        [
+            [
+                _update("first", "model"),
+                _update("second", "model"),
+                _update("third", "assistant"),
+            ]
+        ],
+    )
+
+    contents = _contents(await graph.aget_state(config))
+    assert sorted(contents) == ["first", "hi", "second", "third"], (
+        f"every update's writes must persist; got {contents}"
+    )
+
+
+def test_bulk_update_state_keeps_every_update_next_to_a_pending_task(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    graph = _build_graph(
+        sync_checkpointer, two_nodes=True, interrupt_before=["assistant"]
+    )
+    config = {"configurable": {"thread_id": "bulk-pending-task"}}
+    graph.invoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+    assert graph.get_state(config).next == ("assistant",)
+
+    graph.bulk_update_state(
+        config,
+        [
+            [
+                _update("first", "assistant"),
+                _update("second", "model"),
+                _update("third", "model"),
+            ]
+        ],
+    )
+
+    contents = _contents(graph.get_state(config))
+    assert sorted(contents) == ["first", "hi", "second", "third"], (
+        f"every update's writes must persist; got {contents}"
+    )
+
+
+class _TaskPathOrderSaver(InMemorySaver):
+    """Replays each checkpoint's writes by `(task_path, task_id, idx)`."""
+
+    def get_tuple(self, config: Any) -> Any:
+        tup = super().get_tuple(config)
+        if tup is None or not tup.pending_writes:
+            return tup
+        conf = tup.config["configurable"]
+        stored = self.writes[
+            (conf["thread_id"], conf["checkpoint_ns"], conf["checkpoint_id"])
+        ]
+        rows = sorted(
+            zip(stored.items(), tup.pending_writes),
+            key=lambda row: (row[0][1][3], *row[0][0]),
+        )
+        return tup._replace(pending_writes=[write for _, write in rows])
+
+    get_delta_channel_history = BaseCheckpointSaver.get_delta_channel_history
+    aget_delta_channel_history = BaseCheckpointSaver.aget_delta_channel_history
+
+
+GIVEN = ["u1", "u2", "u3", "u4", "u5", "u6"]
+
+
+def _updates_in_given_order() -> list[list[StateUpdate]]:
+    return [
+        [_update(c, "assistant" if i % 2 else "model") for i, c in enumerate(GIVEN)]
+    ]
+
+
+def test_bulk_update_state_replays_updates_in_the_order_given() -> None:
+    graph = _build_graph(_TaskPathOrderSaver(), two_nodes=True)
+    config = {"configurable": {"thread_id": "bulk-order"}}
+    graph.invoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+
+    graph.bulk_update_state(config, _updates_in_given_order())
+
+    assert _contents(graph.get_state(config)) == ["hi", *GIVEN]
+
+
+async def test_abulk_update_state_replays_updates_in_the_order_given() -> None:
+    graph = _build_graph(_TaskPathOrderSaver(), two_nodes=True)
+    config = {"configurable": {"thread_id": "bulk-order"}}
+    await graph.ainvoke({"messages": [HumanMessage(content="hi", id="hi")]}, config)
+
+    await graph.abulk_update_state(config, _updates_in_given_order())
+
+    assert _contents(await graph.aget_state(config)) == ["hi", *GIVEN]


 # ---------------------------------------------------------------------------
@@ -338,3 +512,29 @@ def test_state_history_chain_after_fresh_update_state_delta_channel() -> None:
    assert update_snapshot.metadata["step"] == 0
    assert update_snapshot.parent_config is None
    assert [m.content for m in update_snapshot.values["messages"]] == ["hello"]
+
+
+def test_update_state_that_snapshots_keeps_a_deferred_node_pending() -> None:
+    channel = DeltaChannel(_messages_delta_reducer, snapshot_frequency=1)
+
+    class State(TypedDict):
+        messages: Annotated[list, channel]
+
+    builder = StateGraph(State)
+    builder.add_node("a", lambda state: {"messages": [HumanMessage("a", id="a")]})
+    builder.add_node(
+        "b", lambda state: {"messages": [HumanMessage("b", id="b")]}, defer=True
+    )
+    builder.add_node("c", lambda state: {})
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    builder.add_edge("a", "c")
+    graph = builder.compile(checkpointer=InMemorySaver(), interrupt_after=["a"])
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke({"messages": [HumanMessage("s", id="s")]}, config)
+
+    graph.update_state(config, {"messages": [HumanMessage("u", id="u")]}, as_node="c")
+    final = graph.invoke(None, config)
+
+    assert [m.content for m in final["messages"]] == ["s", "a", "u", "b"]
+    assert graph.get_state(config).next == ()
@@ -0,0 +1,115 @@
+"""A checkpoint must never be saved without the `DeltaChannel` writes it reads."""
+
+import operator
+import threading
+from typing import Annotated, Any
+
+import pytest
+from langgraph.checkpoint.memory import InMemorySaver
+from typing_extensions import TypedDict
+
+from langgraph.channels.delta import DeltaChannel
+from langgraph.graph import START, StateGraph
+from langgraph.types import Durability
+
+pytestmark = pytest.mark.anyio
+
+INPUT = {"log": [], "plain": []}
+FINAL = {"log": ["a", "b", "c"], "plain": ["a", "b", "c"]}
+
+# Exit mode saves nothing before the failed write, so its retry starts over.
+RETRIES = [
+    pytest.param("sync", None, id="sync"),
+    pytest.param("async", None, id="async"),
+    pytest.param("exit", INPUT, id="exit"),
+]
+
+
+def _append(current: list, writes: list) -> list:
+    return [*current, *(item for write in writes for item in write)]
+
+
+class _State(TypedDict):
+    log: Annotated[list, DeltaChannel(_append)]
+    plain: Annotated[list, operator.add]
+
+
+class _FailsTheWriteOfBOnce(InMemorySaver):
+    failed = False
+
+    def _fail_once(self, writes: Any) -> None:
+        if not self.failed and ("log", ["b"]) in writes:
+            self.failed = True
+            raise ConnectionError("b's write was not saved")
+
+    def put_writes(
+        self, config: Any, writes: Any, task_id: str, task_path: str = ""
+    ) -> None:
+        self._fail_once(writes)
+        super().put_writes(config, writes, task_id, task_path)
+
+    async def aput_writes(
+        self, config: Any, writes: Any, task_id: str, task_path: str = ""
+    ) -> None:
+        self._fail_once(writes)
+        await super().aput_writes(config, writes, task_id, task_path)
+
+
+def _a_then_b_then_c(saver: InMemorySaver) -> Any:
+    builder = StateGraph(_State)
+    for name in "abc":
+        builder.add_node(
+            name, lambda state, name=name: {"log": [name], "plain": [name]}
+        )
+    builder.add_edge(START, "a")
+    builder.add_edge("a", "b")
+    builder.add_edge("b", "c")
+    return builder.compile(checkpointer=saver)
+
+
+@pytest.mark.parametrize(("durability", "retry_input"), RETRIES)
+def test_a_failed_delta_write_is_rerun_not_lost(
+    durability: Durability, retry_input: dict | None
+) -> None:
+    graph = _a_then_b_then_c(_FailsTheWriteOfBOnce())
+    config = {"configurable": {"thread_id": "t"}}
+
+    with pytest.raises(ConnectionError):
+        graph.invoke(INPUT, config, durability=durability)
+    for state in graph.get_state_history(config):
+        assert state.values.get("log", []) == state.values.get("plain", [])
+
+    graph.invoke(retry_input, config, durability=durability)
+    assert graph.get_state(config).values == FINAL
+
+
+@pytest.mark.parametrize(("durability", "retry_input"), RETRIES)
+async def test_a_failed_delta_write_is_rerun_not_lost_async(
+    durability: Durability, retry_input: dict | None
+) -> None:
+    graph = _a_then_b_then_c(_FailsTheWriteOfBOnce())
+    config = {"configurable": {"thread_id": "t"}}
+
+    with pytest.raises(ConnectionError):
+        await graph.ainvoke(INPUT, config, durability=durability)
+    async for state in graph.aget_state_history(config):
+        assert state.values.get("log", []) == state.values.get("plain", [])
+
+    await graph.ainvoke(retry_input, config, durability=durability)
+    assert (await graph.aget_state(config)).values == FINAL
+
+
+def test_a_delta_graph_finishes_on_a_single_background_thread() -> None:
+    graph = _a_then_b_then_c(InMemorySaver())
+    config = {"configurable": {"thread_id": "t"}, "max_concurrency": 1}
+    result: dict = {}
+    run = threading.Thread(
+        target=lambda: result.update(graph.invoke(INPUT, config, durability="async")),
+        daemon=True,
+    )
+
+    run.start()
+    run.join(timeout=10)
+
+    assert not run.is_alive(), "invoke hung"
+    assert result == FINAL
@@ -0,0 +1,534 @@
+"""State reads while some tasks of a superstep are finished and others are paused.
+
+When parallel tasks each call `interrupt()` and only some of them are resumed,
+the superstep stays open. Its recorded writes then contain the old interrupt of
+each finished task next to that task's output. These tests check that state
+reads, which are rebuilt from the checkpointer, report only the interrupts that
+still need an answer.
+"""
+
+import operator
+import sys
+import uuid
+from collections import Counter
+from typing import Annotated, Any
+
+import pytest
+from langgraph.checkpoint.base import BaseCheckpointSaver
+from typing_extensions import TypedDict
+
+from langgraph._internal._constants import (
+    ERROR,
+    INTERRUPT,
+    NO_WRITES,
+    NULL_TASK_ID,
+    RESUME,
+    RETURN,
+)
+from langgraph.func import entrypoint, task
+from langgraph.graph import END, START, StateGraph
+from langgraph.pregel._task_status import read_task_statuses
+from langgraph.types import Command, Durability, Interrupt, Send, interrupt
+
+pytestmark = pytest.mark.anyio
+
+NEEDS_CONTEXTVARS = pytest.mark.skipif(
+    sys.version_info < (3, 11),
+    reason="Python 3.11+ is required for async contextvars support",
+)
+
+
+class State(TypedDict, total=False):
+    log: Annotated[list[str], operator.add]
+    count: int
+
+
+def _config() -> dict[str, Any]:
+    return {"configurable": {"thread_id": str(uuid.uuid4())}}
+
+
+def _build_parallel(
+    checkpointer: BaseCheckpointSaver,
+    calls: Counter[str],
+    *,
+    a_questions: int = 1,
+    a_returns: Any = "log",
+):
+    """Build a graph where nodes `a` and `b` start in parallel and both ask questions.
+
+    `a` asks `a_questions` questions in a row. `a_returns` controls what `a`
+    returns after its last answer. The default `"log"` returns the answers in
+    `log`. Any other value is returned as-is.
+    """
+
+    def a(state: State) -> Any:
+        calls["a"] += 1
+        answers = [interrupt(f"A{i + 1}") for i in range(a_questions)]
+        if a_returns == "log":
+            return {"log": [f"a:{answer}" for answer in answers]}
+        return a_returns
+
+    def b(state: State) -> State:
+        calls["b"] += 1
+        return {"log": [f"b:{interrupt('B')}"]}
+
+    builder = StateGraph(State)
+    builder.add_node("a", a)
+    builder.add_node("b", b)
+    builder.add_edge(START, "a")
+    builder.add_edge(START, "b")
+    builder.add_edge("a", END)
+    builder.add_edge("b", END)
+    return builder.compile(checkpointer=checkpointer)
+
+
+def _interrupt_by_value(snapshot: Any, value: str) -> Interrupt:
+    return next(i for i in snapshot.interrupts if i.value == value)
+
+
+def _task(snapshot: Any, name: str) -> Any:
+    return next(t for t in snapshot.tasks if t.name == name)
+
+
+def _interrupt_values(interrupts: Any) -> list[str]:
+    return sorted(i.value for i in interrupts)
+
+
+# --- Task A answered and finished, task B still paused ---
+
+
+def test_finished_task_does_not_report_answered_interrupt(
+    sync_checkpointer: BaseCheckpointSaver, durability: Durability
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls)
+    config = _config()
+
+    graph.invoke({"log": []}, config, durability=durability)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A1", "B"]
+
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}),
+        config,
+        durability=durability,
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+    assert _task(snapshot, "a").result == {"log": ["a:yes"]}
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+    assert _task(snapshot, "b").result is None
+
+    # Reading the same checkpoint by id gives the record of the step: every task
+    # in it, and every question asked, including the one A already answered.
+    record = graph.get_state(snapshot.config)
+    assert sorted(record.next) == ["a", "b"]
+    assert _interrupt_values(record.interrupts) == ["A1", "B"]
+    assert _interrupt_values(_task(record, "a").interrupts) == ["A1"]
+    assert _task(record, "a").result == {"log": ["a:yes"]}
+
+    # B can still be answered, and the graph finishes normally.
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}),
+        config,
+        durability=durability,
+    )
+    assert sorted(result["log"]) == ["a:yes", "b:ok"]
+    assert calls == {"a": 2, "b": 3}
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+    # History still shows where each question was asked.
+    asked = [
+        _interrupt_values(s.interrupts)
+        for s in graph.get_state_history(config)
+        if s.interrupts
+    ]
+    if durability != "exit":
+        assert asked == [["A1", "B"]]
+
+
+@NEEDS_CONTEXTVARS
+async def test_finished_task_does_not_report_answered_interrupt_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+    assert _task(snapshot, "a").result == {"log": ["a:yes"]}
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+
+    record = await graph.aget_state(snapshot.config)
+    assert _interrupt_values(record.interrupts) == ["A1", "B"]
+    assert _interrupt_values(_task(record, "a").interrupts) == ["A1"]
+
+    result = await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config
+    )
+    assert sorted(result["log"]) == ["a:yes", "b:ok"]
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Task A answered its first question and asked a second one ---
+
+
+def test_task_paused_at_second_question_stays_pending(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2", "B"]
+    # A is not finished: it has a saved answer, but no output.
+    assert sorted(snapshot.next) == ["a", "b"]
+    assert _interrupt_values(_task(snapshot, "a").interrupts) == ["A2"]
+    assert _task(snapshot, "a").result is None
+    assert _interrupt_values(_task(snapshot, "b").interrupts) == ["B"]
+
+    # Both remaining questions can be answered together.
+    result = graph.invoke(
+        Command(
+            resume={
+                _interrupt_by_value(snapshot, "A2").id: "two",
+                _interrupt_by_value(snapshot, "B").id: "ok",
+            }
+        ),
+        config,
+    )
+    assert sorted(result["log"]) == ["a:one", "a:two", "b:ok"]
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+
+@NEEDS_CONTEXTVARS
+async def test_task_paused_at_second_question_stays_pending_async(
+    async_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2", "B"]
+    assert sorted(snapshot.next) == ["a", "b"]
+    assert _interrupt_values(_task(snapshot, "a").interrupts) == ["A2"]
+    assert _task(snapshot, "a").result is None
+
+
+def test_task_paused_at_second_question_then_other_task_finishes(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+    snapshot = graph.get_state(config)
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config)
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A2"]
+    assert snapshot.next == ("a",)
+    assert _task(snapshot, "b").interrupts == ()
+    assert _task(snapshot, "b").result == {"log": ["b:ok"]}
+
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A2").id: "two"}), config
+    )
+    assert sorted(result["log"]) == ["a:one", "a:two", "b:ok"]
+
+
+def test_resume_without_id_rejected_when_second_question_and_other_task_pending(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_questions=2)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "one"}), config
+    )
+
+    # A2 and B are both waiting, so a resume value without an id is ambiguous.
+    with pytest.raises(RuntimeError, match="multiple pending interrupts"):
+        graph.invoke(Command(resume="ambiguous"), config)
+
+
+def test_resume_without_id_rejected_when_subgraph_has_parallel_interrupts(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    # A subgraph node whose child graph pauses in two parallel nodes records
+    # both interrupts under one parent task. Both count as pending, so a resume
+    # value without an id is ambiguous. (Before, only the first was counted and
+    # the value went to whichever interrupt consumed it first.)
+    child_builder = StateGraph(State)
+    child_builder.add_node("a", lambda s: {"log": [f"a:{interrupt('A')}"]})
+    child_builder.add_node("b", lambda s: {"log": [f"b:{interrupt('B')}"]})
+    child_builder.add_edge(START, "a")
+    child_builder.add_edge(START, "b")
+
+    builder = StateGraph(State)
+    builder.add_node("child", child_builder.compile())
+    builder.add_edge(START, "child")
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["A", "B"]
+
+    with pytest.raises(RuntimeError, match="multiple pending interrupts"):
+        graph.invoke(Command(resume="ambiguous"), config)
+
+    result = graph.invoke(
+        Command(
+            resume={
+                _interrupt_by_value(snapshot, "A").id: "x",
+                _interrupt_by_value(snapshot, "B").id: "y",
+            }
+        ),
+        config,
+    )
+    assert sorted(result["log"]) == ["a:x", "b:y"]
+
+
+# --- Task A finished with an empty or falsy result ---
+
+
+@pytest.mark.parametrize(
+    "a_returns",
+    [None, {}, {"count": 0}, {"log": []}],
+    ids=["none", "empty_dict", "zero", "empty_list"],
+)
+def test_task_finished_with_falsy_result(
+    sync_checkpointer: BaseCheckpointSaver, a_returns: Any
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(sync_checkpointer, calls, a_returns=a_returns)
+    config = _config()
+
+    graph.invoke({"log": []}, config)
+    snapshot = graph.get_state(config)
+    graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config)
+    # A already finished, so resuming B must not run A again.
+    assert calls == {"a": 2, "b": 3}
+    snapshot = graph.get_state(config)
+    assert snapshot.next == ()
+    assert snapshot.interrupts == ()
+
+
+@pytest.mark.parametrize("a_returns", [None, {"count": 0}], ids=["none", "zero"])
+@NEEDS_CONTEXTVARS
+async def test_task_finished_with_falsy_result_async(
+    async_checkpointer: BaseCheckpointSaver, a_returns: Any
+) -> None:
+    calls: Counter[str] = Counter()
+    graph = _build_parallel(async_checkpointer, calls, a_returns=a_returns)
+    config = _config()
+
+    await graph.ainvoke({"log": []}, config)
+    snapshot = await graph.aget_state(config)
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "A1").id: "yes"}), config
+    )
+
+    snapshot = await graph.aget_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+    assert snapshot.next == ("b",)
+    assert _task(snapshot, "a").interrupts == ()
+
+    await graph.ainvoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "ok"}), config
+    )
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Subgraphs and the functional API ---
+
+
+def test_parallel_subgraphs_report_only_pending_interrupts(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    class ChildState(TypedDict):
+        prompt: str
+        answers: Annotated[list[str], operator.add]
+
+    def ask(state: ChildState) -> dict[str, Any]:
+        return {"answers": [interrupt(state["prompt"])]}
+
+    child_builder = StateGraph(ChildState)
+    child_builder.add_node("ask", ask)
+    child_builder.add_edge(START, "ask")
+    child = child_builder.compile()
+
+    class ParentState(TypedDict):
+        answers: Annotated[list[str], operator.add]
+
+    builder = StateGraph(ParentState)
+    builder.add_node("child", child)
+    builder.add_conditional_edges(
+        START,
+        lambda _: [Send("child", {"prompt": p, "answers": []}) for p in ("a", "b")],
+        ["child"],
+    )
+    graph = builder.compile(checkpointer=sync_checkpointer)
+    config = _config()
+
+    graph.invoke({"answers": []}, config)
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["a", "b"]
+    graph.invoke(Command(resume={_interrupt_by_value(snapshot, "a").id: "x"}), config)
+
+    snapshot = graph.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["b"]
+    assert snapshot.next == ("child",)
+    finished = next(t for t in snapshot.tasks if t.result is not None)
+    assert finished.interrupts == ()
+    assert finished.result == {"answers": ["x"]}
+
+    result = graph.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "b").id: "y"}), config
+    )
+    assert sorted(result["answers"]) == ["x", "y"]
+
+
+def test_functional_task_finished_with_none_is_not_rerun(
+    sync_checkpointer: BaseCheckpointSaver,
+) -> None:
+    calls: Counter[str] = Counter()
+
+    @task
+    def ask_a() -> None:
+        calls["a"] += 1
+        interrupt("A")
+
+    @task
+    def ask_b() -> str:
+        calls["b"] += 1
+        return interrupt("B")
+
+    @entrypoint(checkpointer=sync_checkpointer)
+    def workflow(_: Any) -> list[Any]:
+        a, b = ask_a(), ask_b()
+        return [a.result(), b.result()]
+
+    config = _config()
+    workflow.invoke(1, config)
+    snapshot = workflow.get_state(config)
+    workflow.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "A").id: "x"}), config
+    )
+
+    snapshot = workflow.get_state(config)
+    assert _interrupt_values(snapshot.interrupts) == ["B"]
+
+    result = workflow.invoke(
+        Command(resume={_interrupt_by_value(snapshot, "B").id: "y"}), config
+    )
+    assert result == [None, "y"]
+    assert calls == {"a": 2, "b": 3}
+
+
+# --- Reading task status from recorded writes ---
+
+
+def test_read_task_statuses() -> None:
+    a1 = Interrupt(value="A1", id="a")
+    a2 = Interrupt(value="A2", id="a")
+    b = Interrupt(value="B", id="b")
+    error = ValueError("boom")
+
+    statuses = read_task_statuses(
+        [
+            # answered and finished: old interrupt stays recorded
+            ("finished", INTERRUPT, (a1,)),
+            ("finished", RESUME, ["yes"]),
+            ("finished", "log", ["a:yes"]),
+            # answered once, then paused at a second question
+            ("paused", INTERRUPT, (a2,)),
+            ("paused", RESUME, ["one"]),
+            # finished with no output
+            ("no_output", INTERRUPT, (b,)),
+            ("no_output", RESUME, ["ok"]),
+            ("no_output", NO_WRITES, None),
+            # functional task that returned None
+            ("returned_none", RETURN, None),
+            # failed
+            ("failed", ERROR, error),
+            # not a task
+            (NULL_TASK_ID, RESUME, "global"),
+        ]
+    )
+
+    assert set(statuses) == {
+        "finished",
+        "paused",
+        "no_output",
+        "returned_none",
+        "failed",
+    }
+
+    assert statuses["finished"].finished
+    assert statuses["finished"].interrupts == (a1,)
+    assert statuses["finished"].pending_interrupts == ()
+    assert statuses["finished"].output == (("log", ["a:yes"]),)
+
+    assert not statuses["paused"].finished
+    assert statuses["paused"].interrupts == (a2,)
+    assert statuses["paused"].pending_interrupts == (a2,)
+    assert statuses["paused"].output == ()
+
+    assert statuses["no_output"].finished
+    assert statuses["no_output"].interrupts == (b,)
+    assert statuses["no_output"].pending_interrupts == ()
+
+    assert statuses["returned_none"].finished
+    assert statuses["returned_none"].output == ((RETURN, None),)
+
+    assert not statuses["failed"].finished
+    assert statuses["failed"].error is error
@@ -152,6 +152,11 @@ def test_empty_inputs():
    ]


+def test_invalid_format():
+    with pytest.raises(ValueError, match="Unrecognized format="):
+        add_messages([], [], format="invalid")
+
+
 def test_non_list_inputs():
    left = HumanMessage(content="Hello", id="1")
    right = AIMessage(content="Hi there!", id="2")
@@ -9410,6 +9410,192 @@ def test_fork_does_not_apply_pending_writes(
    assert result == {"value": 121}


+def _extend(state: list, writes: list[list]) -> list:
+    return [*state, *(v for write in writes for v in write)]
+
+
+class _IntVersionSaver(InMemorySaver):
+    """Integer versions tie exactly where `InMemorySaver`'s break at random."""
+
+    get_next_version = BaseCheckpointSaver.get_next_version
+
+
+def _build_chain_after_a_delta_channel() -> Pregel:
+    return Pregel(
+        nodes={
+            "a": NodeBuilder().subscribe_only("inp").do(lambda _: ["a"]).write_to("d"),
+            "b": NodeBuilder().subscribe_only("d").do(lambda _: "b").write_to("x"),
+            "c": NodeBuilder().subscribe_only("x").do(lambda _: "c").write_to("out"),
+        },
+        channels={
+            "inp": LastValue(str),
+            "d": DeltaChannel(_extend, snapshot_frequency=1),
+            "x": LastValue(str),
+            "out": LastValue(str),
+        },
+        input_channels=["inp"],
+        output_channels=["out"],
+        checkpointer=_IntVersionSaver(),
+    )
+
+
+def test_update_state_after_an_exit_snapshot_infers_the_last_writer() -> None:
+    graph = _build_chain_after_a_delta_channel()
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke({"inp": "go"}, config, durability="exit")
+
+    graph.update_state(config, "u")
+
+    values = graph.get_state(config).values
+    assert values["out"] == "u", (
+        f"the update should apply as c, the last node to write, but state is {values}"
+    )
+
+
+async def test_aupdate_state_after_an_exit_snapshot_infers_the_last_writer() -> None:
+    graph = _build_chain_after_a_delta_channel()
+    config = {"configurable": {"thread_id": "t"}}
+    await graph.ainvoke({"inp": "go"}, config, durability="exit")
+
+    await graph.aupdate_state(config, "u")
+
+    values = (await graph.aget_state(config)).values
+    assert values["out"] == "u", (
+        f"the update should apply as c, the last node to write, but state is {values}"
+    )
+
+
+def test_update_state_after_a_fork_seal_infers_the_subscriber_that_ran() -> None:
+    graph = Pregel(
+        nodes={
+            "a": NodeBuilder()
+            .subscribe_only("inp")
+            .do(lambda _: ["a"])
+            .write_to("d", go="go"),
+            "c": NodeBuilder().subscribe_only("go").do(lambda _: ["c"]).write_to("d"),
+            "b": NodeBuilder().subscribe_only("d").do(lambda _: "b").write_to("out"),
+        },
+        channels={
+            "inp": LastValue(str),
+            "go": EphemeralValue(str),
+            "d": DeltaChannel(_extend),
+            "out": LastValue(str),
+        },
+        input_channels=["inp"],
+        output_channels=["out"],
+        checkpointer=_IntVersionSaver(),
+    )
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke({"inp": "go"}, config)
+    base = next(s for s in graph.get_state_history(config) if s.metadata["step"] == 0)
+    graph.invoke(None, graph.update_state(base.config, "u", as_node="b"))
+
+    graph.update_state(config, "w")
+
+    values = graph.get_state(config).values
+    assert values["out"] == "w", (
+        f"the update should apply as b, the last node to run, but state is {values}"
+    )
+
+
+def test_update_state_after_a_fork_seal_infers_the_node_whose_read_it_advanced() -> (
+    None
+):
+    graph = Pregel(
+        nodes={
+            "a": NodeBuilder().subscribe_only("inp").do(lambda _: ["a"]).write_to("d"),
+            "b": NodeBuilder().subscribe_only("d").do(lambda _: "b").write_to("out"),
+        },
+        channels={
+            "inp": LastValue(str),
+            "d": DeltaChannel(_extend),
+            "out": LastValue(str),
+        },
+        input_channels=["inp"],
+        output_channels=["out"],
+        checkpointer=_IntVersionSaver(),
+    )
+    config = {"configurable": {"thread_id": "t"}}
+    graph.invoke({"inp": "1"}, config)
+    graph.invoke({"inp": "2"}, config)
+    base = next(s for s in graph.get_state_history(config) if s.next == ("a",))
+    fork = graph.update_state(base.config, "u", as_node="b")
+
+    graph.update_state(fork, "w")
+
+    values = graph.get_state(config).values
+    assert values["out"] == "w", (
+        f"the update should apply as b, the last node to read, but state is {values}"
+    )
+
+
+def test_update_state_after_a_snapshotting_update_infers_the_last_writer() -> None:
+    graph = _build_chain_after_a_delta_channel()
+    config = {"configurable": {"thread_id": "t"}}
+    graph.update_state(config, ["u"], as_node="a")
+    graph.invoke(None, config, interrupt_after=["b"])
+
+    graph.update_state(config, "u")
+
+    values = graph.get_state(config).values
+    assert values.get("x") == "u", (
+        f"the update should apply as b, the last node to write, but state is {values}"
+    )
+
+
+async def test_aupdate_state_after_a_snapshotting_update_infers_the_last_writer() -> (
+    None
+):
+    graph = _build_chain_after_a_delta_channel()
+    config = {"configurable": {"thread_id": "t"}}
+    await graph.aupdate_state(config, ["u"], as_node="a")
+    await graph.ainvoke(None, config, interrupt_after=["b"])
+
+    await graph.aupdate_state(config, "u")
+
+    values = (await graph.aget_state(config)).values
+    assert values.get("x") == "u", (
+        f"the update should apply as b, the last node to write, but state is {values}"
+    )
+
+
+class _UpdatesOnlyState(TypedDict):
+    x: Annotated[list[str], operator.add]
+
+
+def _graph_never_run() -> Any:
+    return (
+        StateGraph(_UpdatesOnlyState)
+        .add_node("a", lambda _: {"x": ["a"]})
+        .add_node("b", lambda _: {"x": ["b"]})
+        .add_edge(START, "a")
+        .add_edge("a", "b")
+        .compile(checkpointer=InMemorySaver())
+    )
+
+
+def test_update_state_on_a_thread_seeded_by_updates_applies_as_input() -> None:
+    graph = _graph_never_run()
+    config = {"configurable": {"thread_id": "t"}}
+    graph.update_state(config, {"x": ["u1"]})
+
+    graph.update_state(config, {"x": ["u2"]})
+
+    state = graph.get_state(config)
+    assert (state.values["x"], state.next) == (["u1", "u2"], ("a",))
+
+
+async def test_aupdate_state_on_a_thread_seeded_by_updates_applies_as_input() -> None:
+    graph = _graph_never_run()
+    config = {"configurable": {"thread_id": "t"}}
+    await graph.aupdate_state(config, {"x": ["u1"]})
+
+    await graph.aupdate_state(config, {"x": ["u2"]})
+
+    state = await graph.aget_state(config)
+    assert (state.values["x"], state.next) == (["u1", "u2"], ("a",))
+
+
 async def test_delta_channel_end_to_end_inmemory() -> None:
    """Full graph run: DeltaChannel accumulates correctly across multiple turns."""

@@ -2755,6 +2755,7 @@ def test_error_handler_resumes_after_crash_multiple_nodes():

    call_count = {"a": 0, "b": 0, "handler_a": 0, "handler_b": 0}
    handler_a_started = threading.Event()
+    handler_b_started = threading.Event()

    def node_a(state: State) -> State:
        call_count["a"] += 1
@@ -2775,6 +2776,7 @@ def test_error_handler_resumes_after_crash_multiple_nodes():
        assert "a failed" in str(error.error)
        handler_a_started.set()
        if handler_should_fail[0]:
+            assert handler_b_started.wait(timeout=5), "handler_b never started"
            raise RuntimeError("handler_a crash")
        return {"results": [f"recovered_a:{error.node}"]}

@@ -2782,6 +2784,7 @@ def test_error_handler_resumes_after_crash_multiple_nodes():
        call_count["handler_b"] += 1
        assert error.node == "b"
        assert "b failed" in str(error.error)
+        handler_b_started.set()
        if handler_should_fail[0]:
            raise RuntimeError("handler_b crash")
        return {"results": [f"recovered_b:{error.node}"]}
@@ -8,20 +8,33 @@ caller kwargs to the inner ``(a)stream`` call but rejects ``stream_mode`` and
 ``subgraphs`` since v3 owns them (``stream_mode`` is built from the
 transformer mux; ``subgraphs`` is forced True so nested namespaces flow
 through scoped muxes).
+
+A second regression is pinned here: #7677 (first released in 1.2.0a3)
+declared `interrupt_before` / `interrupt_after` / `control` as named
+parameters on the `Pregel.stream_events` / `astream_events` dispatchers
+but forwarded them only on the v3 branch, silently dropping them on v1/v2
+(where they had reached `(a)stream` through `**kwargs` before).
+`TestAstreamKwargsForwardedOnEveryVersion` and friends pin that they
+reach `(a)stream` on every version, with the v1/v2 passthrough semantics
+restored (exactly what the caller passed, including an explicit `None`)
+and v3's explicit-default semantics preserved.
 """

 from __future__ import annotations

 import sys
+from collections.abc import AsyncIterator, Callable
 from dataclasses import dataclass
 from typing import Any

 import pytest
+from langgraph.checkpoint.memory import InMemorySaver
 from typing_extensions import TypedDict

 from langgraph.constants import END, START
+from langgraph.errors import GraphDrained
 from langgraph.graph import StateGraph
-from langgraph.runtime import Runtime
+from langgraph.runtime import RunControl, Runtime

 NEEDS_CONTEXTVARS = pytest.mark.skipif(
    sys.version_info < (3, 11),
@@ -106,3 +119,274 @@ class TestKwargForwardingAsync:
                version="v3",
                subgraphs=False,
            )
+
+
+_KWARG_NAMES = ("control", "interrupt_before", "interrupt_after")
+
+
+def _build_two_step_graph(
+    first: Callable[[_State], dict[str, Any]] | None = None,
+) -> Any:
+    """A `first -> second` graph with a checkpointer, for interrupt/drain tests."""
+
+    def default_first(state: _State) -> dict[str, Any]:
+        return {"message": state["message"] + " first"}
+
+    def second(state: _State) -> dict[str, Any]:
+        return {"message": state["message"] + " second"}
+
+    builder = StateGraph(_State)
+    builder.add_node("first", first or default_first)
+    builder.add_node("second", second)
+    builder.add_edge(START, "first")
+    builder.add_edge("first", "second")
+    builder.add_edge("second", END)
+    return builder.compile(checkpointer=InMemorySaver())
+
+
+async def _drive_astream_events(
+    graph: Any, config: dict[str, Any], version: str, **kwargs: Any
+) -> None:
+    """Consume an astream_events run for `version` to completion."""
+    if version == "v3":
+        run = await graph.astream_events(
+            {"message": "hi"}, config, version="v3", **kwargs
+        )
+        await run.output()
+    else:
+        async for _ in graph.astream_events(
+            {"message": "hi"}, config, version=version, **kwargs
+        ):
+            pass
+
+
+@pytest.mark.anyio
+@pytest.mark.filterwarnings("ignore:astream_events version='v1' is deprecated")
+@pytest.mark.parametrize("version", ["v1", "v2", "v3"])
+class TestAstreamKwargsForwardedOnEveryVersion:
+    """`interrupt_before`/`interrupt_after`/`control` reach `astream` on every
+    version.
+
+    Regression test for #7677 (first released in 1.2.0a3): the dispatchers
+    captured these parameters as named arguments but forwarded them only on
+    the v3 branch, silently dropping them on v1/v2.
+    """
+
+    async def test_interrupt_before(self, version: str) -> None:
+        graph = _build_two_step_graph()
+        config = {"configurable": {"thread_id": "ib"}}
+        await _drive_astream_events(graph, config, version, interrupt_before=["second"])
+        state = await graph.aget_state(config)
+        assert state.next == ("second",)
+        assert state.values == {"message": "hi first"}
+
+    async def test_interrupt_after(self, version: str) -> None:
+        graph = _build_two_step_graph()
+        config = {"configurable": {"thread_id": "ia"}}
+        await _drive_astream_events(graph, config, version, interrupt_after=["first"])
+        state = await graph.aget_state(config)
+        assert state.next == ("second",)
+        assert state.values == {"message": "hi first"}
+
+    async def test_pre_drained_control(self, version: str) -> None:
+        graph = _build_two_step_graph()
+        config = {"configurable": {"thread_id": "drain"}}
+        control = RunControl()
+        control.request_drain("sigterm")
+        with pytest.raises(GraphDrained, match="sigterm"):
+            await _drive_astream_events(graph, config, version, control=control)
+
+
+class TestStreamEventsV3SyncInterrupts:
+    """Sync v3 static interrupts reach `stream()` after the kwargs rewire."""
+
+    @pytest.mark.parametrize(
+        ("kwarg", "node"),
+        [("interrupt_before", "second"), ("interrupt_after", "first")],
+    )
+    def test_static_interrupt(self, kwarg: str, node: str) -> None:
+        graph = _build_two_step_graph()
+        config = {"configurable": {"thread_id": "sync"}}
+        run = graph.stream_events(
+            {"message": "hi"}, config, version="v3", **{kwarg: [node]}
+        )
+        list(run.values)
+        state = graph.get_state(config)
+        assert state.next == ("second",)
+        assert state.values == {"message": "hi first"}
+
+
+@pytest.mark.anyio
+@pytest.mark.filterwarnings("ignore:astream_events version='v1' is deprecated")
+@pytest.mark.parametrize("version", ["v1", "v2", "v3"])
+class TestAstreamMidRunDrain:
+    """A drain requested from inside a node propagates out of `astream_events`.
+
+    This is the graceful-shutdown scenario: `request_drain()` called while
+    the run is in flight (e.g. from a signal handler), with v1/v2 running
+    inside core's event-stream task. The caller's own `RunControl` is used
+    (the drain reason proves identity), `GraphDrained` propagates to the
+    consumer, and the checkpoint keeps the pending step.
+    """
+
+    async def test_drain_requested_inside_first_node(self, version: str) -> None:
+        control = RunControl()
+
+        def first(state: _State) -> dict[str, Any]:
+            control.request_drain("sigterm-mid")
+            return {"message": state["message"] + " first"}
+
+        graph = _build_two_step_graph(first)
+        config = {"configurable": {"thread_id": "midrun"}}
+
+        with pytest.raises(GraphDrained, match="sigterm-mid"):
+            await _drive_astream_events(graph, config, version, control=control)
+        state = await graph.aget_state(config)
+        assert state.next == ("second",)
+        assert state.values == {"message": "hi first"}
+
+
+def _record_astream_kwargs(graph: Any) -> list[dict[str, Any]]:
+    """Patch `graph.astream` to record the kwargs each call receives."""
+    received: list[dict[str, Any]] = []
+    original = graph.astream
+
+    async def recording_astream(
+        input: Any, config: Any = None, **kwargs: Any
+    ) -> AsyncIterator[Any]:
+        received.append(kwargs)
+        async for chunk in original(input, config, **kwargs):
+            yield chunk
+
+    graph.astream = recording_astream  # type: ignore[method-assign]
+    return received
+
+
+@pytest.mark.anyio
+@pytest.mark.filterwarnings("ignore:astream_events version='v1' is deprecated")
+@pytest.mark.parametrize("version", ["v1", "v2"])
+class TestAstreamV1V2KwargsPassthrough:
+    """v1/v2 forward to `astream` exactly what the caller passed.
+
+    Pre-#7677 semantics: an explicit `None` is forwarded as `None`, and an
+    omitted argument is not forwarded at all (so an override's own default
+    would apply).
+    """
+
+    @pytest.mark.parametrize("name", _KWARG_NAMES)
+    async def test_passed_values_reach_astream(self, version: str, name: str) -> None:
+        graph = _build_two_step_graph()
+        received = _record_astream_kwargs(graph)
+        value: Any = RunControl() if name == "control" else ["second"]
+        await _drive_astream_events(
+            graph, {"configurable": {"thread_id": "rec"}}, version, **{name: value}
+        )
+        assert len(received) == 1
+        assert received[0][name] == value
+        if name == "control":
+            assert received[0][name] is value
+
+    @pytest.mark.parametrize("name", _KWARG_NAMES)
+    async def test_explicit_none_is_forwarded(self, version: str, name: str) -> None:
+        graph = _build_two_step_graph()
+        received = _record_astream_kwargs(graph)
+        await _drive_astream_events(
+            graph, {"configurable": {"thread_id": "rec-none"}}, version, **{name: None}
+        )
+        assert len(received) == 1
+        assert received[0][name] is None
+
+    @pytest.mark.parametrize("name", _KWARG_NAMES)
+    async def test_omitted_values_are_absent(self, version: str, name: str) -> None:
+        graph = _build_two_step_graph()
+        received = _record_astream_kwargs(graph)
+        await _drive_astream_events(
+            graph, {"configurable": {"thread_id": "rec-omit"}}, version
+        )
+        assert len(received) == 1
+        assert name not in received[0]
+
+
+@pytest.mark.anyio
+class TestAstreamV3KwargsDefaults:
+    """v3 keeps its since-inception explicit-default semantics (#7519).
+
+    Omitted `interrupt_before`/`interrupt_after`/`control` are supplied to
+    `astream` as `None`; passed values are forwarded as-is.
+    """
+
+    async def test_omitted_values_arrive_as_none(self) -> None:
+        graph = _build_two_step_graph()
+        received = _record_astream_kwargs(graph)
+        await _drive_astream_events(
+            graph, {"configurable": {"thread_id": "v3-rec"}}, "v3"
+        )
+        assert len(received) == 1
+        assert received[0]["control"] is None
+        assert received[0]["interrupt_before"] is None
+        assert received[0]["interrupt_after"] is None
+
+    @pytest.mark.parametrize("name", _KWARG_NAMES)
+    async def test_passed_values_reach_astream(self, name: str) -> None:
+        graph = _build_two_step_graph()
+        received = _record_astream_kwargs(graph)
+        value: Any = RunControl() if name == "control" else ["second"]
+        await _drive_astream_events(
+            graph, {"configurable": {"thread_id": "v3-rec-2"}}, "v3", **{name: value}
+        )
+        assert len(received) == 1
+        assert received[0][name] == value
+        if name == "control":
+            assert received[0][name] is value
+
+
+def _record_stream_kwargs(graph: Any) -> list[dict[str, Any]]:
+    """Patch `graph.stream` to record the kwargs each call receives."""
+    received: list[dict[str, Any]] = []
+    original = graph.stream
+
+    def recording_stream(input: Any, config: Any = None, **kwargs: Any) -> Any:
+        received.append(kwargs)
+        yield from original(input, config, **kwargs)
+
+    graph.stream = recording_stream  # type: ignore[method-assign]
+    return received
+
+
+def _drive_stream_events_v3(graph: Any, config: dict[str, Any], **kwargs: Any) -> None:
+    """Consume a sync v3 stream_events run to completion."""
+    run = graph.stream_events({"message": "hi"}, config, version="v3", **kwargs)
+    list(run.values)
+
+
+class TestStreamEventsV3SyncKwargsDefaults:
+    """Sync v3 keeps its since-inception explicit-default semantics (#7519).
+
+    Mirror of `TestAstreamV3KwargsDefaults`: omitted
+    `interrupt_before`/`interrupt_after`/`control` are supplied to `stream`
+    as `None`; passed values are forwarded as-is. Pins the sync helper
+    against a kwargs-only "simplification" that would change subclass
+    default handling.
+    """
+
+    def test_omitted_values_arrive_as_none(self) -> None:
+        graph = _build_two_step_graph()
+        received = _record_stream_kwargs(graph)
+        _drive_stream_events_v3(graph, {"configurable": {"thread_id": "s-rec"}})
+        assert len(received) == 1
+        assert received[0]["control"] is None
+        assert received[0]["interrupt_before"] is None
+        assert received[0]["interrupt_after"] is None
+
+    @pytest.mark.parametrize("name", _KWARG_NAMES)
+    def test_passed_values_reach_stream(self, name: str) -> None:
+        graph = _build_two_step_graph()
+        received = _record_stream_kwargs(graph)
+        value: Any = RunControl() if name == "control" else ["second"]
+        _drive_stream_events_v3(
+            graph, {"configurable": {"thread_id": "s-rec-2"}}, **{name: value}
+        )
+        assert len(received) == 1
+        assert received[0][name] == value
+        if name == "control":
+            assert received[0][name] is value
@@ -1217,6 +1217,20 @@ wheels = [
    { url = "https://files.pythonhosted.org/packages/38/64/285f20a31679bf547b75602702f7800e74dbabae36ef324f716c02804753/jupyter-1.1.1-py2.py3-none-any.whl", hash = "sha256:7a59533c22af65439b24bbe60373a4e95af8f16ac65a6c00820ad378e3f7cc83", size = 2657, upload-time = "2024-08-30T07:15:47.045Z" },
 ]

+[[package]]
+name = "jupyter-builder"
+version = "1.2.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "jupyter-core" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
+    { name = "traitlets" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/75/3e/56f593e6a664cd14d441724654ce8243f3cac7d3e45867cf084749c8bc75/jupyter_builder-1.2.3.tar.gz", hash = "sha256:01aba6794eb9b19e0e29ae21137ca60ba4135c70347d4b9f664a586822b8c809", size = 1024218, upload-time = "2026-09-04T18:54:09.411Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/84/aa/be79e87c50698673f196d0633fc1664607da2289f9688d1de7a1c9db9e71/jupyter_builder-1.2.3-py3-none-any.whl", hash = "sha256:c5ea5a7190c2a7b082494abade98eece1b2b5bd5dbd7d610606cbcd10a1d08b3", size = 947541, upload-time = "2026-09-04T18:54:07.644Z" },
+]
+
 [[package]]
 name = "jupyter-client"
 version = "8.8.0"
@@ -1342,28 +1356,28 @@ wheels = [

 [[package]]
 name = "jupyterlab"
-version = "4.5.10"
+version = "4.6.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "async-lru" },
    { name = "httpx" },
    { name = "ipykernel" },
    { name = "jinja2" },
+    { name = "jupyter-builder" },
    { name = "jupyter-core" },
    { name = "jupyter-lsp" },
    { name = "jupyter-server" },
    { name = "jupyterlab-server" },
    { name = "notebook-shim" },
    { name = "packaging" },
-    { name = "setuptools" },
    { name = "tomli", marker = "python_full_version < '3.11'" },
    { name = "tornado" },
    { name = "traitlets" },
    { name = "typing-extensions", marker = "python_full_version < '3.12'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/74/24/621aa20ec0d2fe72f52095bda0fc1be7738ac21aabe4129ff623140d5cdf/jupyterlab-4.5.10.tar.gz", hash = "sha256:77e8d80b78be59b2eaba2154562e21caa6e79c2f1281d6f486584f7144ee2f47", size = 23998879, upload-time = "2026-07-21T12:43:27.324Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/33/8d/995cc142f6083346b35e7d3eadc5a6717ee89ce64ea53577010ac493bc3c/jupyterlab-4.6.4.tar.gz", hash = "sha256:404f49b081819378524886c9db66dba57a5565981eff885830df1baba3a17df5", size = 28335647, upload-time = "2026-09-21T15:25:18.779Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/3b/e4/072bc0d3c6d45d414062a06af7ee81c02a2c12d769c358ec9919f9995ffd/jupyterlab-4.6.4-py3-none-any.whl", hash = "sha256:15b13f991d3985129c797eb84d9949eeb8b6615e14b444868e642411f2c418b2", size = 17171596, upload-time = "2026-09-21T15:25:14.123Z" },
 ]

 [[package]]
@@ -1404,7 +1418,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.6.1"
+version = "1.6.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -1418,9 +1432,9 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/90/12/aff76ca89c219ebe6f9dd3c5dbc4e3b1cf5450e9fc7037dccad23d45cd7a/langchain_core-1.6.1.tar.gz", hash = "sha256:1b156cb395aac4f009a8a1b38a574c7d948fe2d5f74c96e0d8a5017b4149e04f", size = 1003359, upload-time = "2026-08-27T19:31:14.956Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/ed/ed/ceecd3bfcfc77a94cf30a9f1506e907fdea447458825e01914a72d2d1a6f/langchain_core-1.6.5.tar.gz", hash = "sha256:bdb059fef65473fd444558dbb18f50901657402c43ceed9dc0fdc7b76a393c6b", size = 1007041, upload-time = "2026-09-24T18:11:06.487Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/59/68/447ac7e734990b7ed9dcfc3b6dee9a4cd4d4169e296429fa71a9a47c1c7b/langchain_core-1.6.5-py3-none-any.whl", hash = "sha256:54c7b0e9314b9084fb04405bb33dc5d32986d512d92b7b8863899cd5f6267556", size = 572136, upload-time = "2026-09-24T18:11:04.837Z" },
 ]

 [[package]]
@@ -1437,7 +1451,7 @@ wheels = [

 [[package]]
 name = "langgraph"
-version = "1.2.12"
+version = "1.2.14"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
@@ -1623,7 +1637,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -1917,13 +1931,13 @@ dev = [
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
    { name = "pytest-watch" },
-    { name = "ruff", specifier = "==0.16.5" },
+    { name = "ruff", specifier = "==0.16.9" },
    { name = "starlette" },
    { name = "ty" },
 ]
 lint = [
    { name = "codespell" },
-    { name = "ruff", specifier = "==0.16.5" },
+    { name = "ruff", specifier = "==0.16.9" },
    { name = "starlette" },
    { name = "ty" },
 ]
@@ -2146,18 +2160,19 @@ wheels = [

 [[package]]
 name = "notebook"
-version = "7.5.6"
+version = "7.6.3"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
+    { name = "jupyter-builder" },
    { name = "jupyter-server" },
    { name = "jupyterlab" },
    { name = "jupyterlab-server" },
    { name = "notebook-shim" },
    { name = "tornado" },
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 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/a1/f7/907b98438cf00bdc4e296570058f29a347214bb42338a48e3b7eae58ae2a/notebook-7.6.3-py3-none-any.whl", hash = "sha256:ad7e0eb765fba836cd4a2ab0c7a3a26cde1d91665fbf6f533b6ae7b2de6d88d2", size = 5548452, upload-time = "2026-09-21T18:07:21.563Z" },
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 [[package]]
 name = "types-requests"
-version = "2.33.0.20260712"
+version = "2.33.0.20260906"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "urllib3" },
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 [[package]]
@@ -3687,11 +3702,11 @@ wheels = [

 [[package]]
 name = "urllib3"
-version = "2.7.0"
+version = "2.8.0"
 source = { registry = "https://pypi.org/simple" }
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+    { url = "https://files.pythonhosted.org/packages/92/9d/c4e665119135114480843e7ab388fa94d8480650450e6f8e26b70d323a4c/urllib3-2.8.0-py3-none-any.whl", hash = "sha256:0cf3cae568d36aa9576b28dfb35f11328f1cb974ca7647d9475ebb86c75ac6e3", size = 135717, upload-time = "2026-09-15T19:29:34.577Z" },
 ]

 [[package]]
@@ -286,7 +286,7 @@ wheels = [

 [[package]]
 name = "langgraph"
-version = "1.2.12"
+version = "1.2.14"
 source = { editable = "../langgraph" }
 dependencies = [
    { name = "langchain-core" },
@@ -370,7 +370,7 @@ test = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.3.0"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -626,13 +626,13 @@ dev = [
    { name = "pytest-asyncio" },
    { name = "pytest-mock" },
    { name = "pytest-watch" },
-    { name = "ruff", specifier = "==0.16.5" },
+    { name = "ruff", specifier = "==0.16.9" },
    { name = "starlette" },
    { name = "ty" },
 ]
 lint = [
    { name = "codespell" },
-    { name = "ruff", specifier = "==0.16.5" },
+    { name = "ruff", specifier = "==0.16.9" },
    { name = "starlette" },
    { name = "ty" },
 ]
@@ -1363,11 +1363,11 @@ wheels = [

 [[package]]
 name = "urllib3"
-version = "2.7.0"
+version = "2.8.0"
 source = { registry = "https://pypi.org/simple" }
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 [[package]]
@@ -22,18 +22,23 @@ RUN pip install --no-cache-dir \
    "langchain>=1.3.0" \
    "deepagents>=0.6.2"

-# Swap the published langgraph *core* for this monorepo's local copy, so the
-# server executes the langgraph under test rather than the latest release.
+# Swap the published langgraph *core* and *checkpoint* for this monorepo's
+# local copies, so the server executes the langgraph under test rather than the
+# latest release.
 # We keep the rest of the base image (langgraph-api, runtime, Go core server)
 # on `latest` — that still surfaces upstream regressions — but the core the
 # server runs is now the PR's, which is what lets this suite catch core
 # regressions (e.g. ensure_config / runtime changes) before they're published.
-# `--no-deps` keeps the base image's already-compatible
-# checkpoint/prebuilt/sdk; we only replace core. The local source comes from
-# the `langgraph_src` additional build context (see docker-compose.yml).
+# Checkpoint goes with core because core can need a checkpoint API from the
+# same release. `--no-deps` keeps the base image's already-compatible
+# prebuilt/sdk. The local sources come from the `checkpoint_src` and
+# `langgraph_src` additional build contexts (see docker-compose.yml).
+COPY --from=checkpoint_src pyproject.toml README.md LICENSE /opt/checkpoint-src/
+COPY --from=checkpoint_src langgraph /opt/checkpoint-src/langgraph/
 COPY --from=langgraph_src pyproject.toml README.md LICENSE /opt/langgraph-src/
 COPY --from=langgraph_src langgraph /opt/langgraph-src/langgraph/
-RUN pip install --no-cache-dir --force-reinstall --no-deps /opt/langgraph-src
+RUN pip install --no-cache-dir --force-reinstall --no-deps \
+    /opt/checkpoint-src /opt/langgraph-src

 # Project graphs + registration config.
 COPY graph/ /app/graph/
@@ -38,16 +38,17 @@ services:
    # see ./Dockerfile. The base image bundles langgraph-api +
    # langgraph_runtime_postgres + langgraph_license + the Go core-server;
    # on top we add graph deps (deepagents), the graph files, and this
-    # monorepo's local langgraph *core* (so the server runs the code under
-    # test, not the released langgraph).
+    # monorepo's local langgraph *core* and *checkpoint* (so the server runs
+    # the code under test, not the released langgraph).
    build:
      context: .
      dockerfile: Dockerfile
      additional_contexts:
-        # The monorepo's local langgraph core (libs/langgraph), installed over
-        # the base image so the server runs the langgraph under test. See the
-        # Dockerfile for why.
+        # The monorepo's local langgraph core (libs/langgraph) and checkpoint
+        # (libs/checkpoint), installed over the base image so the server runs
+        # the langgraph under test. See the Dockerfile for why.
        langgraph_src: ../../langgraph
+        checkpoint_src: ../../checkpoint
    image: langgraph-v3-integration-api:local
    depends_on:
      postgres:
@@ -3,7 +3,7 @@ from langgraph_sdk.client import get_client, get_sync_client
 from langgraph_sdk.encryption import Encryption
 from langgraph_sdk.encryption.types import DecryptResult, EncryptionContext

-__version__ = "0.4.5"
+__version__ = "0.4.6"

 __all__ = [
    "Auth",
@@ -24,6 +24,7 @@ from langchain_core.language_models.chat_model_stream import AsyncChatModelStrea
 from langchain_protocol import Event, SubscribeParams

 from langgraph_sdk._async.http import HttpClient
+from langgraph_sdk._shared.utilities import _quote_path_param
 from langgraph_sdk.schema import LangSmithTracing, QueryParamTypes
 from langgraph_sdk.stream.controller import _SeenEventIds
 from langgraph_sdk.stream.decoders import (
@@ -151,7 +152,7 @@ class _AgentModule:
            query_params.update(dict(params))
        request_headers = {**self._owner._headers, **dict(headers or {})}
        return await self._owner._http.get(
-            f"/assistants/{self._owner.assistant_id}/graph",
+            f"/assistants/{_quote_path_param(self._owner.assistant_id)}/graph",
            params=query_params,
            headers=request_headers or None,
        )
@@ -1902,7 +1903,7 @@ class AsyncThreadStream:
    async def _fetch_state(self) -> dict[str, Any]:
        """Fetch the current thread state from the REST endpoint."""
        return await self._http.get(
-            f"/threads/{self.thread_id}/state",
+            f"/threads/{_quote_path_param(self.thread_id)}/state",
            headers=self._headers or None,
        )

@@ -22,6 +22,7 @@ from typing import Any, Literal, TypedDict, cast
 from langchain_core.language_models.chat_model_stream import ChatModelStream
 from langchain_protocol import Event, SubscribeParams

+from langgraph_sdk._shared.utilities import _quote_path_param
 from langgraph_sdk._sync.http import SyncHttpClient
 from langgraph_sdk.schema import LangSmithTracing, QueryParamTypes
 from langgraph_sdk.stream.decoders import (
@@ -194,7 +195,7 @@ class _SyncAgentModule:
            query_params.update(dict(params))
        request_headers = {**self._owner._headers, **dict(headers or {})}
        return self._owner._http.get(
-            f"/assistants/{self._owner.assistant_id}/graph",
+            f"/assistants/{_quote_path_param(self._owner.assistant_id)}/graph",
            params=query_params,
            headers=request_headers or None,
        )
@@ -1552,7 +1553,7 @@ class SyncThreadStream:
    def _fetch_state(self) -> dict[str, Any]:
        """Fetch the current thread state from the REST endpoint."""
        return self._http.get(
-            f"/threads/{self.thread_id}/state",
+            f"/threads/{_quote_path_param(self.thread_id)}/state",
            headers=self._headers or None,
        )

@@ -312,7 +312,7 @@ class _ActionHandler(typing.Protocol[V]):
    ) -> types.HandlerResult: ...


-T = typing.TypeVar("T", covariant=True)
+T = typing.TypeVar("T")


 class _ResourceActionOn(typing.Generic[T]):
@@ -36,7 +36,7 @@ test = [
    "pytest-watch",
 ]
 lint = [
-    "ruff==0.16.5",
+    "ruff==0.16.9",
    "codespell",
    "ty",
    "starlette",
@@ -0,0 +1,92 @@
+"""Thread stream REST helpers must percent-encode `thread_id` and `assistant_id`
+so a value containing reserved characters or dot-segments stays an opaque path
+segment instead of being normalized into a different path by the HTTP stack.
+
+Each test drives a public entry point (`threads.stream(...)` followed by
+`thread.output` or `thread.agent.get_tree()`) with an identifier containing
+`..`, `/`, and `#`, and asserts the request path keeps it as one segment.
+"""
+
+from __future__ import annotations
+
+import httpx
+
+from langgraph_sdk._async.http import HttpClient
+from langgraph_sdk._async.threads import ThreadsClient
+from langgraph_sdk._sync.http import SyncHttpClient
+from langgraph_sdk._sync.threads import SyncThreadsClient
+
+# Interpolated raw, httpx would collapse the `..` segments and treat `#` as a
+# fragment, producing `/assistants/a/graph` and `/other/path`.
+THREAD_ID = "../assistants/a/graph#"
+ASSISTANT_ID = "../../other/path#"
+ENCODED_STATE_PATH = "/threads/..%2Fassistants%2Fa%2Fgraph%23/state"
+ENCODED_GRAPH_PATH = "/assistants/..%2F..%2Fother%2Fpath%23/graph"
+
+TERMINAL_STATE = {"values": {"ok": True}, "next": [], "tasks": []}
+
+
+def _recording_handler(gets: list[str]):
+    def handler(request: httpx.Request) -> httpx.Response:
+        if request.method == "GET":
+            path = request.url.raw_path.decode("ascii").split("?", 1)[0]
+            gets.append(path)
+            return httpx.Response(200, json=TERMINAL_STATE)
+        # Lifecycle watcher subscription: an empty event stream.
+        return httpx.Response(
+            200, headers={"content-type": "text/event-stream"}, content=b""
+        )
+
+    return handler
+
+
+async def test_async_output_encodes_thread_id():
+    gets: list[str] = []
+    async with httpx.AsyncClient(
+        transport=httpx.MockTransport(_recording_handler(gets)),
+        base_url="https://example.com",
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id=THREAD_ID, assistant_id="agent") as thread:
+            assert await thread.output == {"ok": True}
+
+    assert gets == [ENCODED_STATE_PATH]
+
+
+async def test_async_agent_get_tree_encodes_assistant_id():
+    gets: list[str] = []
+    async with httpx.AsyncClient(
+        transport=httpx.MockTransport(_recording_handler(gets)),
+        base_url="https://example.com",
+    ) as raw:
+        threads = ThreadsClient(HttpClient(raw))
+        async with threads.stream(thread_id="t-1", assistant_id=ASSISTANT_ID) as thread:
+            await thread.agent.get_tree()
+
+    assert gets == [ENCODED_GRAPH_PATH]
+
+
+def test_sync_output_encodes_thread_id():
+    gets: list[str] = []
+    with httpx.Client(
+        transport=httpx.MockTransport(_recording_handler(gets)),
+        base_url="https://example.com",
+    ) as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id=THREAD_ID, assistant_id="agent") as thread:
+            assert thread.output == {"ok": True}
+
+    assert gets == [ENCODED_STATE_PATH]
+
+
+def test_sync_agent_get_tree_encodes_assistant_id():
+    gets: list[str] = []
+    with httpx.Client(
+        transport=httpx.MockTransport(_recording_handler(gets)),
+        base_url="https://example.com",
+    ) as raw:
+        threads = SyncThreadsClient(SyncHttpClient(raw))
+        with threads.stream(thread_id="t-1", assistant_id=ASSISTANT_ID) as thread:
+            thread.agent.get_tree()
+
+    assert gets == [ENCODED_GRAPH_PATH]
@@ -266,7 +266,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.6.1"
+version = "1.6.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -281,9 +281,9 @@ dependencies = [
    { name = "typing-extensions", version = "4.16.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.15'" },
    { name = "uuid-utils" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/ed/ed/ceecd3bfcfc77a94cf30a9f1506e907fdea447458825e01914a72d2d1a6f/langchain_core-1.6.5.tar.gz", hash = "sha256:bdb059fef65473fd444558dbb18f50901657402c43ceed9dc0fdc7b76a393c6b", size = 1007041, upload-time = "2026-09-24T18:11:06.487Z" }
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+    { url = "https://files.pythonhosted.org/packages/59/68/447ac7e734990b7ed9dcfc3b6dee9a4cd4d4169e296429fa71a9a47c1c7b/langchain_core-1.6.5-py3-none-any.whl", hash = "sha256:54c7b0e9314b9084fb04405bb33dc5d32986d512d92b7b8863899cd5f6267556", size = 572136, upload-time = "2026-09-24T18:11:04.837Z" },
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 [[package]]
@@ -301,7 +301,7 @@ wheels = [

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