fix(cli): preserve hosted Studio URL overrides

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

.github/scripts/run_langgraph_cli_test.py

@@ -32,8 +32,6 @@ def test(config: pathlib.Path, port: int, tag: str, verbose: bool):
             docker_compose=None,
             port=port,
             watch=False,
-            debugger_port=None,
-            debugger_base_url=f"http://127.0.0.1:{port}",
             postgres_uri=None,
             api_version=None,
             image=tag,
@@ -173,5 +171,5 @@ if __name__ == "__main__":
     except BaseException:
         logger.exception("Test failed")
         raise
-    
+
     logger.info("Test execution finished")

.gitignore

@@ -77,10 +77,6 @@ __pypackages__/
 # Environments
 .env
 .envrc
-*.crt
-*.key
-*.pem
-credentials.json
 .venv
 .venvs
 env/
@@ -102,7 +98,6 @@ dmypy.json
 
 .vercel
 .turbo
-node_modules/
 .editorconfig
 .scratch
 .worktrees/

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

@@ -6,12 +6,9 @@ import traceback
 from collections.abc import Callable
 from uuid import uuid4
 
-from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
-from langgraph.checkpoint.base.id import uuid6
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from langgraph.checkpoint.base import BaseCheckpointSaver
 
 from langgraph.checkpoint.conformance.spec._delta_fixtures import build_delta_chain
-from langgraph.checkpoint.conformance.test_utils import generate_metadata
 
 
 async def test_history_returns_writes_oldest_first(
@@ -51,6 +48,8 @@ async def test_history_seed_is_nearest_snapshot(
     result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
     assert "seed" in result["ch"], "Expected seed from snapshot at step 3"
     seed = result["ch"]["seed"]
+    from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
     actual_value = seed.value if isinstance(seed, _DeltaSnapshot) else seed
     assert actual_value == 3, f"Expected seed value 3 (step 3), got {actual_value}"
     writes = result["ch"]["writes"]
@@ -82,6 +81,11 @@ async def test_history_multi_channel(
     tid = str(uuid4())
     configs: list = []
     parent_cfg = None
+    from langgraph.checkpoint.base import Checkpoint
+    from langgraph.checkpoint.base.id import uuid6
+    from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+    from langgraph.checkpoint.conformance.test_utils import generate_metadata
 
     for step in range(5):
         config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
@@ -157,6 +161,11 @@ async def test_history_migration_plain_value_as_seed(
     channel_values[ch] (not a _DeltaSnapshot). The walk should treat it as the
     seed and terminate there.
     """
+    from langgraph.checkpoint.base import Checkpoint
+    from langgraph.checkpoint.base.id import uuid6
+
+    from langgraph.checkpoint.conformance.test_utils import generate_metadata
+
     tid = str(uuid4())
     configs: list = []
     parent_cfg = None
@@ -199,74 +208,6 @@ async def test_history_migration_plain_value_as_seed(
     assert values == [2], f"Expected [2], got {values}"
 
 
-async def test_history_seed_ancestor_own_writes_are_replayed(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """Writes stored AT the seed ancestor must be included in `writes`.
-
-    A stored value is the state ENTERING its checkpoint; the writes stored
-    under that same checkpoint are what produced its child and are therefore
-    NOT subsumed by it. Only writes at ancestors OLDER than the seed are
-    subsumed, and the walk terminates before reaching them.
-
-    This holds for plain-value seeds (migration from a pre-delta channel type)
-    exactly as it does for `_DeltaSnapshot` seeds. Skipping the seed
-    ancestor's own writes silently drops the first post-migration write.
-    """
-    tid = str(uuid4())
-    configs: list = []
-    parent_cfg = None
-
-    # Each step's write is labelled by the role it plays, so the assertion
-    # below reads directly rather than by step index.
-    writes_by_step = {
-        0: "older-than-seed",  # subsumed by the value stored at step 1
-        1: "at-seed",  # the seed's own write, produced step 2
-        2: "after-seed",  # delta-era write on the path to the head
-        3: "pending-at-head",  # pending for the next step, never replayed
-    }
-    # Steps 0 and 1 store a plain value; 1 is the nearest, so it is the seed.
-    values_by_step = {0: [10], 1: [10, 20]}
-
-    for step in range(4):
-        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
-        if parent_cfg:
-            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
-                "checkpoint_id"
-            ]
-        cv: dict = {}
-        cvs: dict = {}
-        if step in values_by_step:
-            cv["ch"] = values_by_step[step]
-            cvs["ch"] = step + 1
-        cp = Checkpoint(
-            v=1,
-            id=str(uuid6(clock_seq=-1)),
-            ts="",
-            channel_values=cv,
-            channel_versions=cvs,
-            versions_seen={},
-            updated_channels=None,
-        )
-        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
-        configs.append(parent_cfg)
-        await saver.aput_writes(
-            parent_cfg, [("ch", writes_by_step[step])], str(uuid4())
-        )
-
-    head = configs[-1]
-    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
-
-    assert "seed" in result["ch"], "Expected seed from plain value at step 1"
-    assert result["ch"]["seed"] == [10, 20], (
-        f"Expected nearest plain value [10, 20], got {result['ch']['seed']}"
-    )
-    values = [w[2] for w in result["ch"]["writes"]]
-    assert values == ["at-seed", "after-seed"], (
-        f'Expected ["at-seed", "after-seed"], got {values}'
-    )
-
-
 ALL_DELTA_CHANNEL_HISTORY_TESTS = [
     test_history_returns_writes_oldest_first,
     test_history_seed_is_nearest_snapshot,
@@ -275,7 +216,6 @@ ALL_DELTA_CHANNEL_HISTORY_TESTS = [
     test_history_empty_channels_returns_empty,
     test_history_walk_to_root_no_seed,
     test_history_migration_plain_value_as_seed,
-    test_history_seed_ancestor_own_writes_are_replayed,
 ]
 
 

libs/checkpoint-conformance/pyproject.toml

@@ -58,14 +58,8 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
 ]
 lint.ignore = ["E501", "B008"]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"
 
 [tool.uv.sources]

libs/checkpoint-conformance/uv.lock

@@ -279,7 +279,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },

libs/checkpoint-postgres/README.md

@@ -67,12 +67,24 @@ with PostgresSaver.from_conn_string(DB_URI) as checkpointer:
         "v": 4,
         "ts": "2024-07-31T20:14:19.804150+00:00",
         "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {"my_key": "meow", "node": "node"},
-        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
+        "channel_values": {
+            "my_key": "meow",
+            "node": "node"
+        },
+        "channel_versions": {
+            "__start__": 2,
+            "my_key": 3,
+            "start:node": 3,
+            "node": 3
+        },
         "versions_seen": {
             "__input__": {},
-            "__start__": {"__start__": 1},
-            "node": {"start:node": 2},
+            "__start__": {
+            "__start__": 1
+            },
+            "node": {
+            "start:node": 2
+            }
         },
     }
 
@@ -96,12 +108,24 @@ async with AsyncPostgresSaver.from_conn_string(DB_URI) as checkpointer:
         "v": 4,
         "ts": "2024-07-31T20:14:19.804150+00:00",
         "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {"my_key": "meow", "node": "node"},
-        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
+        "channel_values": {
+            "my_key": "meow",
+            "node": "node"
+        },
+        "channel_versions": {
+            "__start__": 2,
+            "my_key": 3,
+            "start:node": 3,
+            "node": 3
+        },
         "versions_seen": {
             "__input__": {},
-            "__start__": {"__start__": 1},
-            "node": {"start:node": 2},
+            "__start__": {
+            "__start__": 1
+            },
+            "node": {
+            "start:node": 2
+            }
         },
     }
 

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

@@ -223,7 +223,7 @@ class PostgresSaver(BasePostgresSaver):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """
+        """  # noqa
         thread_id = config["configurable"]["thread_id"]
         checkpoint_id = get_checkpoint_id(config)
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
@@ -478,11 +478,9 @@ class PostgresSaver(BasePostgresSaver):
         stage1_sql = _build_delta_stage1_sql(channels, paged=True)
         parent_of: dict[str, str | None] = {}
         ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
-        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
-        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
+        hs_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
         chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
         seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
-        seed_inline_by_ch: dict[str, Any] = {}
         walk_cursor_by_ch: dict[str, str | None] = {}
         seeded: set[str] = set()
         cursor: str | None = None
@@ -491,8 +489,7 @@ class PostgresSaver(BasePostgresSaver):
             while True:
                 stage1_params: list[Any] = []
                 for ch in channels:
-                    # ver_i, blob channel, blob version, inline_i
-                    stage1_params.extend([ch, ch, ch, ch])
+                    stage1_params.extend([ch, ch])
                 stage1_params.extend(
                     [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
                 )
@@ -505,19 +502,16 @@ class PostgresSaver(BasePostgresSaver):
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
+                    hs_by_i_by_cid,
                 )
                 self._try_advance_walks(
                     checkpoint_id,
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
+                    hs_by_i_by_cid,
                     chain_by_ch,
                     seed_ver_by_ch,
-                    seed_inline_by_ch,
                     walk_cursor_by_ch,
                     seeded,
                 )
@@ -552,7 +546,6 @@ class PostgresSaver(BasePostgresSaver):
             channels=channels,
             chain_by_ch=chain_by_ch,
             seed_ver_by_ch=seed_ver_by_ch,
-            seed_inline_by_ch=seed_inline_by_ch,
             stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
         )
 

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

@@ -426,11 +426,9 @@ class AsyncPostgresSaver(BasePostgresSaver):
         stage1_sql = _build_delta_stage1_sql(channels, paged=True)
         parent_of: dict[str, str | None] = {}
         ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
-        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
-        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
+        hs_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
         chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
         seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
-        seed_inline_by_ch: dict[str, Any] = {}
         walk_cursor_by_ch: dict[str, str | None] = {}
         seeded: set[str] = set()
         cursor: str | None = None
@@ -439,8 +437,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
             while True:
                 stage1_params: list[Any] = []
                 for ch in channels:
-                    # ver_i, blob channel, blob version, inline_i
-                    stage1_params.extend([ch, ch, ch, ch])
+                    stage1_params.extend([ch, ch])
                 stage1_params.extend(
                     [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
                 )
@@ -453,19 +450,16 @@ class AsyncPostgresSaver(BasePostgresSaver):
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
+                    hs_by_i_by_cid,
                 )
                 self._try_advance_walks(
                     checkpoint_id,
                     channels,
                     parent_of,
                     ver_by_i_by_cid,
-                    hb_by_i_by_cid,
-                    inline_by_i_by_cid,
+                    hs_by_i_by_cid,
                     chain_by_ch,
                     seed_ver_by_ch,
-                    seed_inline_by_ch,
                     walk_cursor_by_ch,
                     seeded,
                 )
@@ -496,7 +490,6 @@ class AsyncPostgresSaver(BasePostgresSaver):
             channels=channels,
             chain_by_ch=chain_by_ch,
             seed_ver_by_ch=seed_ver_by_ch,
-            seed_inline_by_ch=seed_inline_by_ch,
             stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
         )
 
@@ -580,7 +573,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]
+                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
                     self.loop,
                 ).result()
             except StopAsyncIteration:

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

@@ -199,68 +199,27 @@ class _DeltaStage2Row(TypedDict, total=False):
 
 
 def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
-    """Build stage 1 SQL with K parallel version lookups + seed probes.
+    """Build stage 1 SQL with 2K parallel JSONB key lookups.
 
     For channels=["messages", "files"] (with `paged=True`) the result is::
 
         SELECT checkpoint_id, parent_checkpoint_id,
                checkpoint -> 'channel_versions' ->> %s AS ver_0,
-               EXISTS (SELECT 1 FROM checkpoint_blobs b0
-                       WHERE b0.thread_id = checkpoints.thread_id
-                         AND b0.checkpoint_ns = checkpoints.checkpoint_ns
-                         AND b0.channel = %s
-                         AND b0.version = checkpoint -> 'channel_versions' ->> %s
-                         AND b0.type <> 'empty') AS hb_0,
-               checkpoint -> 'channel_values' -> %s AS inline_0,
+               (checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_0,
                checkpoint -> 'channel_versions' ->> %s AS ver_1,
-               EXISTS (...) AS hb_1,
-               checkpoint -> 'channel_values' -> %s AS inline_1
+               (checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_1
         FROM checkpoints
         WHERE thread_id = %s AND checkpoint_ns = %s
           AND (%s::text IS NULL OR checkpoint_id < %s)
         ORDER BY checkpoint_id DESC
         LIMIT %s
 
-    A stored value for a channel lives in one of two places, because `put`
-    splits them:
-
-    * **blob** — non-primitive values (and `_DeltaSnapshot`) are moved to
-      `checkpoint_blobs`. `hb_i` ("has blob") probes for one. The probe hits
-      that table's primary key `(thread_id, checkpoint_ns, channel, version)`
-      exactly, so it is an index lookup per row per channel.
-    * **inline** — `None`, `str`, `int`, `float` and `bool` stay in the
-      checkpoint's own `channel_values` and get no blob row at all. `inline_i`
-      returns that value.
-
-    Testing only for a key in `channel_values` (the previous approach) missed
-    blob-stored plain values, since `put` leaves an inline marker there for
-    `_DeltaSnapshot` but not for a plain value — which is what a thread
-    migrated from a pre-delta channel type leaves behind. Probing only the
-    blobs table would conversely miss inline primitives. Both are needed, and
-    the caller treats "either present" as the seed.
-
-    `hb_i` also disambiguates the two: for a `_DeltaSnapshot`, `inline_i` is the
-    literal `true` marker rather than the value, so a blob must win over an
-    inline reading whenever one exists. That ordering is what makes a genuine
-    inline `true` (a bool channel) distinguishable from the marker.
-
-    The `type <> 'empty'` predicate mirrors the check stage 2 already applies
-    when resolving the seed blob. `put` does not currently produce `empty` rows
-    on this path — `blob_versions` is filtered to keys present in
-    `channel_values`, so `_dump_blobs`' empty branch is unreachable from it —
-    but without the predicate the two stages could disagree: stage 1 would
-    terminate the walk on a row stage 2 then discards, yielding no seed *and* a
-    truncated write chain, which is the failure this function exists to avoid.
-
     Channel names are passed as `%s` parameters (safe from SQL injection).
-    Only the column aliases `ver_i` / `hb_i` / `inline_i` and the subquery alias
-    `b{i}` are interpolated into the SQL string (i is bounded by len(channels)
-    and uses safe identifiers).
+    Only the column aliases `ver_i` / `hs_i` are interpolated into the
+    SQL string (i is bounded by len(channels) and uses safe identifiers).
 
-    Caller must extend params with `[ch_0 x4, ch_1 x4, ..., thread_id, ns,
-    cursor, cursor, page_size]` when `paged=True` — four per channel: the
-    version lookup, the blob's channel, the version the blob must match, and the
-    inline lookup.
+    Caller must extend params with `[ch_0, ch_0, ch_1, ch_1, ...,
+    thread_id, ns, cursor, cursor, page_size]` when `paged=True`.
 
     When `paged=False`, the WHERE has no cursor predicate and there's no
     LIMIT/ORDER BY — kept as a non-public helper for tests/diagnostics.
@@ -269,13 +228,7 @@ def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
     for i in range(len(channels)):
         cols.append(
             f"checkpoint -> 'channel_versions' ->> %s AS ver_{i}, "
-            f"EXISTS (SELECT 1 FROM checkpoint_blobs b{i} "
-            f"WHERE b{i}.thread_id = checkpoints.thread_id "
-            f"AND b{i}.checkpoint_ns = checkpoints.checkpoint_ns "
-            f"AND b{i}.channel = %s "
-            f"AND b{i}.version = checkpoint -> 'channel_versions' ->> %s "
-            f"AND b{i}.type <> 'empty') AS hb_{i}, "
-            f"checkpoint -> 'channel_values' -> %s AS inline_{i}"
+            f"(checkpoint -> 'channel_values' -> %s) IS NOT NULL AS hs_{i}"
         )
     sql = (
         "SELECT checkpoint_id, parent_checkpoint_id, "
@@ -389,8 +342,7 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         channels: Sequence[str],
         parent_of: dict[str, str | None],
         ver_by_i_by_cid: list[dict[str, str | None]],
-        hb_by_i_by_cid: list[dict[str, bool]],
-        inline_by_i_by_cid: list[dict[str, Any]],
+        hs_by_i_by_cid: list[dict[str, bool]],
     ) -> str | None:
         """Fold one stage-1 page into the running walk-state mappings.
 
@@ -404,8 +356,7 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
             parent_of[cid] = cast("str | None", r["parent_checkpoint_id"])
             for i in range(len(channels)):
                 ver_by_i_by_cid[i][cid] = cast("str | None", r.get(f"ver_{i}"))
-                hb_by_i_by_cid[i][cid] = bool(r.get(f"hb_{i}"))
-                inline_by_i_by_cid[i][cid] = r.get(f"inline_{i}")
+                hs_by_i_by_cid[i][cid] = bool(r.get(f"hs_{i}"))
             # Rows are DESC; the last one is the smallest cid in the page.
             oldest = cid
         return oldest
@@ -416,11 +367,9 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         channels: Sequence[str],
         parent_of: Mapping[str, str | None],
         ver_by_i_by_cid: Sequence[Mapping[str, str | None]],
-        hb_by_i_by_cid: Sequence[Mapping[str, bool]],
-        inline_by_i_by_cid: Sequence[Mapping[str, Any]],
+        hs_by_i_by_cid: Sequence[Mapping[str, bool]],
         chain_by_ch: dict[str, list[str]],
         seed_ver_by_ch: dict[str, str | None],
-        seed_inline_by_ch: dict[str, Any],
         walk_cursor_by_ch: dict[str, str | None],
         seeded: set[str],
     ) -> None:
@@ -428,15 +377,14 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
 
         Uses the partial `parent_of` map accumulated so far. A walk stops
         either because:
-          (a) it found a stored value for its channel — a blob or an inline
-              primitive (channel becomes seeded),
+          (a) it found a snapshot for its channel (channel becomes seeded),
           (b) it reached a real root (parent_of[cid] is None — fully
               materialized at this point), or
           (c) the next ancestor cid isn't in `parent_of` yet (waiting for
               a later page; the cursor stays put).
 
-        Mutates `chain_by_ch`, `seed_ver_by_ch`, `seed_inline_by_ch`,
-        `walk_cursor_by_ch`, and `seeded` in place.
+        Mutates `chain_by_ch`, `seed_ver_by_ch`, `walk_cursor_by_ch`, and
+        `seeded` in place.
         """
         for i, ch in enumerate(channels):
             if ch in seeded:
@@ -446,22 +394,15 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                 walk_cursor_by_ch[ch] = parent_of.get(target_id)
             cur_cid = walk_cursor_by_ch[ch]
             ch_chain = chain_by_ch[ch]
-            hb_i = hb_by_i_by_cid[i]
-            inline_i = inline_by_i_by_cid[i]
+            hs_i = hs_by_i_by_cid[i]
             ver_i = ver_by_i_by_cid[i]
             while cur_cid is not None:
                 if cur_cid not in parent_of:
                     # Need more pages to continue this walk.
                     break
                 ch_chain.append(cur_cid)
-                has_blob = hb_i.get(cur_cid, False)
-                inline = inline_i.get(cur_cid)
-                if has_blob or inline is not None:
-                    # A blob wins: for a `_DeltaSnapshot` the inline reading is
-                    # the `true` marker, not the value.
+                if hs_i.get(cur_cid, False):
                     seed_ver_by_ch[ch] = ver_i.get(cur_cid)
-                    if not has_blob:
-                        seed_inline_by_ch[ch] = inline
                     seeded.add(ch)
                     cur_cid = None
                     break
@@ -474,23 +415,16 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
         channels: Sequence[str],
         chain_by_ch: Mapping[str, list[str]],
         seed_ver_by_ch: Mapping[str, str | None],
-        seed_inline_by_ch: Mapping[str, Any],
         stage2_rows: Sequence[_DeltaStage2Row],
     ) -> dict[str, DeltaChannelHistory]:
         """Demux stage 2 rows per channel; produce per-channel histories.
 
         stage2_rows carry `channel` on every row. We build per-channel
         `writes_by_cid` and per-channel `seed_blob` dicts, then assemble
-        a `DeltaChannelHistory` per requested channel.
-
-        A seed comes from the blobs table when the walk found one there, and
-        otherwise from `seed_inline_by_ch` — `put` keeps `None`, `str`, `int`,
-        `float` and `bool` values in the checkpoint's own `channel_values` with
-        no blob row, so those never appear in `stage2_rows`.
-
-        The `seed` key is omitted when the walk reached root without finding a
-        stored value, or when the seed blob is sentinel "empty" — in both cases
-        the consumer treats absence as "start empty".
+        a `DeltaChannelHistory` per requested channel. The `seed` key is omitted
+        when the walk reached root with no snapshot found, or when the
+        seed blob is sentinel "empty" — in both cases the consumer treats
+        absence as "start empty".
         """
         # writes_by_ch_by_cid[channel][cid] = list of (type, blob, task_id, idx)
         writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
@@ -539,10 +473,6 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
                 blob = seed_blob_by_ver.get((ch, seed_version))
                 if blob is not None and blob[0] != "empty":
                     entry["seed"] = self.serde.loads_typed(blob)
-                elif ch in seed_inline_by_ch:
-                    # Inline primitive: stored in the checkpoint, not the blobs
-                    # table, so stage 2 never returned a row for it.
-                    entry["seed"] = seed_inline_by_ch[ch]
             result[ch] = entry
         return result
 

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

@@ -334,7 +334,7 @@ class ShallowPostgresSaver(BasePostgresSaver):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """
+        """  # noqa
         thread_id = config["configurable"]["thread_id"]
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         args = (thread_id, checkpoint_ns)
@@ -885,7 +885,7 @@ class AsyncShallowPostgresSaver(BasePostgresSaver):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]
+                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
                     self.loop,
                 ).result()
             except StopAsyncIteration:

libs/checkpoint-postgres/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.1"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -32,7 +32,6 @@ test = [
   "pytest-mock",
   "psycopg[binary]",
   "langgraph-checkpoint",
-  "langgraph-checkpoint-conformance",
   "pytest-watcher",
 ]
 lint = [
@@ -50,7 +49,6 @@ default-groups = ['dev']
 
 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
-langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }
 
 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -66,8 +64,6 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]

libs/checkpoint-postgres/tests/test_async.py

@@ -380,15 +380,13 @@ async def test_delta_channel_chain_reconstruction(saver_name: str) -> None:
         "langgraph.channels.delta", reason="langgraph core not installed"
     )
 
-    # Deferred on purpose: langgraph core is not a test dependency of this
-    # package, so these must stay behind the importorskip above.
-    from typing import Annotated  # noqa: PLC0415
+    from typing import Annotated
 
-    from langchain_core.messages import AIMessage, HumanMessage  # noqa: PLC0415
-    from langgraph.channels.delta import DeltaChannel  # noqa: PLC0415
-    from langgraph.graph import START, StateGraph  # noqa: PLC0415
-    from langgraph.graph.message import _messages_delta_reducer  # noqa: PLC0415
-    from typing_extensions import TypedDict  # noqa: PLC0415
+    from langchain_core.messages import AIMessage, HumanMessage
+    from langgraph.channels.delta import DeltaChannel
+    from langgraph.graph import START, StateGraph
+    from langgraph.graph.message import _messages_delta_reducer
+    from typing_extensions import TypedDict
 
     class State(TypedDict):
         messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]

libs/checkpoint-postgres/tests/test_conformance_delta.py

@@ -1,30 +0,0 @@
-"""Run delta-channel conformance capabilities against AsyncPostgresSaver."""
-
-from __future__ import annotations
-
-import pytest
-from langgraph.checkpoint.conformance import validate
-from langgraph.checkpoint.conformance.initializer import checkpointer_test
-
-from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
-from tests.conftest import DEFAULT_URI
-
-
-@pytest.mark.asyncio
-async def test_delta_channel_conformance():
-    @checkpointer_test(name="AsyncPostgresSaver")
-    async def postgres_saver():
-        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-            await saver.setup()
-            yield saver
-
-    report = await validate(
-        postgres_saver,
-        capabilities={
-            "delta_channel_history",
-        },
-    )
-    for cap, result in report.results.items():
-        if result.passed is False:
-            details = "\n".join(result.failures or [])
-            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint-postgres/tests/test_delta_plain_value_seed.py

@@ -1,204 +0,0 @@
-"""Seed detection for `DeltaChannel` histories on Postgres.
-
-`put` splits stored values in two: primitives stay inline in the checkpoint's
-`channel_values`, everything else moves to `checkpoint_blobs`. Only
-`_DeltaSnapshot` leaves an inline marker behind when it moves, so the stage-1
-walk has to check both places — a blob probe alone misses inline primitives, and
-an inline-key check alone missed blob-stored plain values, which is what a thread
-migrated from a pre-delta channel type leaves behind. See #8534.
-"""
-
-from __future__ import annotations
-
-from typing import Any
-from uuid import uuid4
-
-import pytest
-from langgraph.checkpoint.base import Checkpoint, empty_checkpoint
-from langgraph.checkpoint.base.id import uuid6
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
-
-from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
-from tests.conftest import DEFAULT_URI
-
-CHANNEL = "items"
-
-
-async def _build_chain(saver: AsyncPostgresSaver, seed_value: Any) -> tuple[str, dict]:
-    """Store `seed_value` at step 1, then two steps that store nothing.
-
-    Every step carries a write so the walk has something to collect.
-    Returns `(thread_id, head_config)`.
-    """
-    thread_id = str(uuid4())
-    parent: dict | None = None
-    for step in range(4):
-        config: dict = {"configurable": {"thread_id": thread_id, "checkpoint_ns": ""}}
-        if parent is not None:
-            config["configurable"]["checkpoint_id"] = parent["configurable"][
-                "checkpoint_id"
-            ]
-        cp: Checkpoint = empty_checkpoint()
-        cp["id"] = str(uuid6(clock_seq=step))
-        new_versions: dict[str, Any] = {}
-        if step == 1:
-            cp["channel_values"][CHANNEL] = seed_value
-            cp["channel_versions"][CHANNEL] = "v1"
-            new_versions[CHANNEL] = "v1"
-        else:
-            cp["channel_versions"][CHANNEL] = f"v{step}"
-        parent = await saver.aput(
-            config, cp, {"source": "loop", "step": step, "parents": {}}, new_versions
-        )
-        await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
-    assert parent is not None
-    return thread_id, parent
-
-
-@pytest.mark.asyncio
-async def test_plain_value_seed_is_found() -> None:
-    """A pre-delta plain value must be located as the seed.
-
-    Before #8534 the walk ran to the root and returned no seed, which happens
-    to reconstruct correctly for additive reducers while costing an
-    O(thread length) replay on every read.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        _, head = await _build_chain(saver, [10, 20])
-
-        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        entry = result[CHANNEL]
-
-        assert entry.get("seed") == [10, 20], (
-            f"expected the plain value as seed, got {entry.get('seed', '<missing>')}"
-        )
-        # Only the writes between the seed and the head's parent replay: step 1
-        # (the seed's own) and step 2. Step 0 is older than the seed, step 3 is
-        # pending at the head.
-        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_delta_snapshot_seed_is_found() -> None:
-    """The `_DeltaSnapshot` path keeps working, so both seed kinds agree."""
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        _, head = await _build_chain(saver, _DeltaSnapshot([10, 20]))
-
-        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        entry = result[CHANNEL]
-
-        seed = entry.get("seed")
-        assert isinstance(seed, _DeltaSnapshot), f"expected a snapshot, got {seed!r}"
-        assert seed.value == [10, 20]
-        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_version_bump_without_a_value_does_not_hide_an_older_seed() -> None:
-    """A delta-era step bumps `channel_versions` without storing a value, so no
-    blob exists for that version. The probe must report no seed there and keep
-    walking rather than stopping at a version it cannot resolve.
-
-    Step 0 holds the real value; step 1 bumps the version with nothing stored.
-    Walking back from the head has to pass step 1 to reach step 0.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        thread_id = str(uuid4())
-        parent: dict | None = None
-        for step in range(4):
-            config: dict = {
-                "configurable": {"thread_id": thread_id, "checkpoint_ns": ""}
-            }
-            if parent is not None:
-                config["configurable"]["checkpoint_id"] = parent["configurable"][
-                    "checkpoint_id"
-                ]
-            cp: Checkpoint = empty_checkpoint()
-            cp["id"] = str(uuid6(clock_seq=step))
-            new_versions: dict[str, Any] = {}
-            if step == 0:
-                cp["channel_values"][CHANNEL] = [10, 20]
-                cp["channel_versions"][CHANNEL] = "v0"
-                new_versions[CHANNEL] = "v0"
-            elif step == 1:
-                # Version bumped, value absent -> no blob row written.
-                cp["channel_versions"][CHANNEL] = "v1"
-                new_versions[CHANNEL] = "v1"
-            else:
-                cp["channel_versions"][CHANNEL] = "v1"
-            parent = await saver.aput(
-                config,
-                cp,
-                {"source": "loop", "step": step, "parents": {}},
-                new_versions,
-            )
-            await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
-        assert parent is not None
-
-        result = await saver.aget_delta_channel_history(
-            config=parent, channels=[CHANNEL]
-        )
-        entry = result[CHANNEL]
-
-        assert entry.get("seed") == [10, 20], (
-            "the walk stopped at the empty blob instead of reaching the real "
-            f"value at step 0; got {entry.get('seed', '<missing>')}"
-        )
-        assert [w[2] for w in entry["writes"]] == ["w0", "w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_inline_primitive_seed_is_found() -> None:
-    """`put` keeps `None`, `str`, `int`, `float` and `bool` in the checkpoint's
-    own `channel_values` with no blob row, so a blob probe alone cannot see
-    them. Stage 1 reads the inline value too and uses it when there is no blob.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-        for seed_value in (42, "x", 3.5, None):
-            _, head = await _build_chain(saver, seed_value)
-            entry = (
-                await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-            )[CHANNEL]
-            if seed_value is None:
-                # A JSON null is indistinguishable from "no value stored", so
-                # the walk keeps going; replay from empty is the correct result.
-                assert "seed" not in entry
-            else:
-                assert entry.get("seed") == seed_value, (
-                    f"inline {type(seed_value).__name__} seed not found: "
-                    f"{entry.get('seed', '<missing>')!r}"
-                )
-                assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
-
-
-@pytest.mark.asyncio
-async def test_inline_true_is_not_read_as_a_snapshot_marker() -> None:
-    """`put` inlines a literal `true` in `channel_values` as the marker for a
-    `_DeltaSnapshot`, which is also what a genuine `bool` channel holding
-    `True` looks like. A blob exists only in the snapshot case, so preferring
-    the blob keeps the two apart.
-    """
-    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
-        await saver.setup()
-
-        _, head = await _build_chain(saver, True)
-        entry = (
-            await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
-        )[CHANNEL]
-        assert entry.get("seed") is True, (
-            f"a real inline True must survive, got {entry.get('seed', '<missing>')!r}"
-        )
-
-        _, snap_head = await _build_chain(saver, _DeltaSnapshot(True))
-        snap_entry = (
-            await saver.aget_delta_channel_history(config=snap_head, channels=[CHANNEL])
-        )[CHANNEL]
-        seed = snap_entry.get("seed")
-        assert isinstance(seed, _DeltaSnapshot), (
-            f"the marker must resolve to the blob, not inline true; got {seed!r}"
-        )
-        assert seed.value is True

libs/checkpoint-postgres/uv.lock

@@ -159,7 +159,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -276,7 +276,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -322,36 +322,9 @@ test = [
     { name = "redis" },
 ]
 
-[[package]]
-name = "langgraph-checkpoint-conformance"
-version = "0.0.2"
-source = { editable = "../checkpoint-conformance" }
-dependencies = [
-    { name = "langgraph-checkpoint" },
-]
-
-[package.metadata]
-requires-dist = [{ name = "langgraph-checkpoint", editable = "../checkpoint" }]
-
-[package.metadata.requires-dev]
-dev = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-    { name = "ruff" },
-    { name = "ty" },
-]
-lint = [
-    { name = "ruff" },
-    { name = "ty" },
-]
-test = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-]
-
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.1"
 source = { editable = "." }
 dependencies = [
     { name = "langgraph-checkpoint" },
@@ -365,7 +338,6 @@ dev = [
     { name = "anyio" },
     { name = "codespell" },
     { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -382,7 +354,6 @@ lint = [
 test = [
     { name = "anyio" },
     { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -403,7 +374,6 @@ dev = [
     { name = "anyio" },
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -420,7 +390,6 @@ lint = [
 test = [
     { name = "anyio" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },

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

@@ -77,7 +77,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
         >>> result = graph.invoke(3, config)
         >>> graph.get_state(config)
         StateSnapshot(values=4, next=(), config={'configurable': {'thread_id': '1', 'checkpoint_ns': '', 'checkpoint_id': '0c62ca34-ac19-445d-bbb0-5b4984975b2a'}}, parent_config=None)
-    """
+    """  # noqa
 
     conn: sqlite3.Connection
     is_setup: bool
@@ -222,7 +222,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """
+        """  # noqa
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         with self.cursor(transaction=False) as cur:
             # find the latest checkpoint for the thread_id

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

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

libs/checkpoint-sqlite/pyproject.toml

@@ -30,7 +30,6 @@ test = [
   "pytest-mock",
   "pytest-watcher",
   "langgraph-checkpoint",
-  "langgraph-checkpoint-conformance",
   "pytest-retry>=1.7.0",
 ]
 lint = [
@@ -48,7 +47,6 @@ default-groups = ['dev']
 
 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
-langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }
 
 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -64,8 +62,6 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]

libs/checkpoint-sqlite/tests/test_conformance_delta.py

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

libs/checkpoint-sqlite/tests/test_delta_channel_migration.py

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

libs/checkpoint-sqlite/tests/test_get_delta_channel_history.py

@@ -32,13 +32,13 @@ from langchain_core.runnables import RunnableConfig
 pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
 pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
 
-from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: I001
-from langgraph.checkpoint.serde.types import _DeltaSnapshot
-from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]
-from typing_extensions import TypedDict
+from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: E402,I001
+from langgraph.checkpoint.serde.types import _DeltaSnapshot  # noqa: E402
+from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]  # noqa: E402
+from typing_extensions import TypedDict  # noqa: E402
 
-from langgraph.checkpoint.sqlite import SqliteSaver
-from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+from langgraph.checkpoint.sqlite import SqliteSaver  # noqa: E402
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver  # noqa: E402
 
 pytestmark = pytest.mark.anyio
 

libs/checkpoint-sqlite/tests/test_store.py

@@ -1,11 +1,7 @@
-import math
 import os
-import random
 import re
 import tempfile
-import time
 import uuid
-from collections import Counter, defaultdict
 from collections.abc import Generator, Iterable
 from contextlib import contextmanager
 from typing import Any, Literal, cast
@@ -37,6 +33,10 @@ class CharacterEmbeddings(Embeddings):
 
     def __init__(self, dims: int = 50, seed: int = 42):
         """Initialize with embedding dimensions and random seed."""
+        import math
+        import random
+        from collections import defaultdict
+
         self._rng = random.Random(seed)
         self.dims = dims
         # Create projection vector for each character lazily
@@ -48,6 +48,9 @@ class CharacterEmbeddings(Embeddings):
 
     def _embed_one(self, text: str) -> list[float]:
         """Embed a single text."""
+        import math
+        from collections import Counter
+
         counts = Counter(text)
         total = sum(counts.values())
 
@@ -335,6 +338,8 @@ class TestSqliteStore:
 
             # Test update
             # Small delay to ensure the updated timestamp is different
+            import time
+
             time.sleep(0.01)
 
             updated_value = {"title": "Updated Document", "content": "Hello, Updated!"}

libs/checkpoint-sqlite/uv.lock

@@ -168,7 +168,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions" },
+    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -285,7 +285,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -331,33 +331,6 @@ test = [
     { name = "redis" },
 ]
 
-[[package]]
-name = "langgraph-checkpoint-conformance"
-version = "0.0.2"
-source = { editable = "../checkpoint-conformance" }
-dependencies = [
-    { name = "langgraph-checkpoint" },
-]
-
-[package.metadata]
-requires-dist = [{ name = "langgraph-checkpoint", editable = "../checkpoint" }]
-
-[package.metadata.requires-dev]
-dev = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-    { name = "ruff" },
-    { name = "ty" },
-]
-lint = [
-    { name = "ruff" },
-    { name = "ty" },
-]
-test = [
-    { name = "pytest" },
-    { name = "pytest-asyncio" },
-]
-
 [[package]]
 name = "langgraph-checkpoint-sqlite"
 version = "3.1.1"
@@ -372,7 +345,6 @@ dependencies = [
 dev = [
     { name = "codespell" },
     { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -388,7 +360,6 @@ lint = [
 ]
 test = [
     { name = "langgraph-checkpoint" },
-    { name = "langgraph-checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -407,7 +378,6 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -423,7 +393,6 @@ lint = [
 ]
 test = [
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },

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

@@ -148,16 +148,17 @@ class InMemorySaver(
         whose stored blob is non-empty. Other channels keep walking until
         they find their own terminator or hit the root.
 
-        A blob is the value AT its ancestor, prior to the writes stored
-        under that same ancestor (those writes produce its child, which
-        is on the path to the target). This holds for `_DeltaSnapshot`
-        blobs and for pre-delta plain values alike, so the seed
-        ancestor's own writes are always collected. Writes at ancestors
-        older than the seed are subsumed by the seed value and are never
-        reached — the walk terminates there.
+        Pre-delta plain-value blobs subsume their ancestor's pending
+        writes (the value already includes them); `_DeltaSnapshot` blobs
+        do not (snapshot is the value AT that ancestor, prior to its own
+        pending writes that produce the child).
         """
         if not channels:
             return {}
+        # Imported lazily to avoid a hard checkpoint→serde-types coupling at
+        # module import; only this override needs the runtime check.
+        from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
         thread_id = config["configurable"]["thread_id"]
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         checkpoint_id = config["configurable"].get("checkpoint_id", "")
@@ -204,6 +205,11 @@ class InMemorySaver(
             ):
                 if ch not in remaining:
                     continue
+                blob_value = blob_value_by_ch.get(ch)
+                if blob_value is not None and not isinstance(
+                    blob_value, _DeltaSnapshot
+                ):
+                    continue
                 collected_by_ch[ch].append(
                     (tid, ch, self.serde.loads_typed(serialized))
                 )

libs/checkpoint/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -59,15 +59,9 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"
 
 [tool.ty.rules]

libs/checkpoint/tests/test_conformance_delta.py

@@ -12,14 +12,10 @@ conformance = pytest.importorskip(
 
 @pytest.mark.asyncio
 async def test_delta_channel_conformance():
-    # Imported inside the test: the module-level importorskip above is what
-    # makes these safe, so they cannot move to the top of the file.
-    from langgraph.checkpoint.conformance import validate  # noqa: PLC0415
-    from langgraph.checkpoint.conformance.initializer import (  # noqa: PLC0415
-        checkpointer_test,
-    )
+    from langgraph.checkpoint.conformance import validate
+    from langgraph.checkpoint.conformance.initializer import checkpointer_test
 
-    from langgraph.checkpoint.memory import InMemorySaver  # noqa: PLC0415
+    from langgraph.checkpoint.memory import InMemorySaver
 
     @checkpointer_test(name="InMemorySaver")
     async def mem_saver():

libs/checkpoint/tests/test_encrypted.py

@@ -307,6 +307,8 @@ class TestWithMsgpackAllowlistEncrypted:
             def loads_typed(self, data: tuple[str, bytes]) -> None:
                 return None
 
+        from langgraph.checkpoint.serde.base import CipherProtocol
+
         class DummyCipher(CipherProtocol):
             def encrypt(self, plaintext: bytes) -> tuple[str, bytes]:
                 return "dummy", plaintext

libs/checkpoint/tests/test_jsonplus.py

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

libs/checkpoint/tests/test_memory.py

@@ -1,4 +1,3 @@
-import asyncio
 import logging
 from typing import Any
 
@@ -524,6 +523,7 @@ class TestBaseFallbackGetChannelWrites:
         `threading.local()` guard would let whichever task set it first
         short-circuit the other to `writes=[]`.
         """
+        import asyncio
 
         saver, thread_id, ns = self._build_saver_with_chain()
 
@@ -577,19 +577,9 @@ class TestPreDeltaBlobTerminator:
     """
 
     def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
-        """Four-checkpoint chain spanning the migration boundary:
-
-        * `cp0` — pre-delta ancestor OLDER than the seed. Its write
-          (`OLDER-WRITE`) is already folded into `cp1`'s stored value, so the
-          walk must terminate at `cp1` and never reach it.
-        * `cp1` — pre-delta, blob `["A"]`. That value is the state ENTERING
-          `cp1`; the write stored under `cp1` (`PRE-DELTA-WRITE`) is what
-          produced `cp2` and is NOT subsumed by the blob.
-        * `cp2` — delta-era, no stored value, write `B`.
-        * `cp3` — target, delta-era, write `PENDING-AT-TARGET`.
-
-        Reconstructing at `cp3` must yield seed `["A"]` plus writes
-        `["PRE-DELTA-WRITE", "B"]`.
+        """Three-checkpoint chain: cp1 (pre-delta, blob=[A]), cp2 (delta,
+        write=B), cp3 (delta, write=C). Reconstructing at cp3 must yield
+        seed=[A] + writes=[B, C].
 
         Returns `(saver, thread_id, ns, channel, cp3_id)`.
         """
@@ -597,21 +587,16 @@ class TestPreDeltaBlobTerminator:
         serde = JsonPlusSerializer()
         thread_id, ns, channel = "t1", "", "messages"
 
-        v0 = "00000000000000000000000000000000.0"
         v1 = "00000000000000000000000000000001.0"
         v2 = "00000000000000000000000000000002.0"
         v3 = "00000000000000000000000000000003.0"
 
-        # Pre-delta: cp0 and cp1 stored real blobs for the channel.
-        saver.blobs[(thread_id, ns, channel, v0)] = serde.dumps_typed([])
+        # Pre-delta: cp1 stored a real blob for the channel.
         saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(["A"])
         # Delta-era: cp2 and cp3 store "empty"; real writes in checkpoint_writes.
         saver.blobs[(thread_id, ns, channel, v2)] = ("empty", b"")
         saver.blobs[(thread_id, ns, channel, v3)] = ("empty", b"")
 
-        cp0 = empty_checkpoint()
-        cp0["id"] = "cp0"
-        cp0["channel_versions"][channel] = v0
         cp1 = empty_checkpoint()
         cp1["id"] = "cp1"
         cp1["channel_versions"][channel] = v1
@@ -623,24 +608,16 @@ class TestPreDeltaBlobTerminator:
         cp3["channel_versions"][channel] = v3
 
         saver.storage[thread_id][ns] = {
-            "cp0": (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
-            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), "cp0"),
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
             "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
             "cp3": (serde.dumps_typed(cp3), serde.dumps_typed({}), "cp2"),
         }
-        # Write under cp0 is older than the seed — cp1's blob already folded
-        # it in, and the terminator must stop before reaching it.
-        saver.writes[(thread_id, ns, "cp0")][("task0", 0)] = (
+        # Write under cp1 would be from the pre-delta era and MUST be ignored
+        # (the blob already captures it). We add one and assert it is not
+        # folded into the reconstructed result.
+        saver.writes[(thread_id, ns, "cp1")][("task0", 0)] = (
             "task0",
             channel,
-            serde.dumps_typed("OLDER-WRITE"),
-            "",
-        )
-        # Write under cp1 postdates cp1's blob (it is what produced cp2, which
-        # stores no value of its own) and MUST be replayed.
-        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
-            "task1",
-            channel,
             serde.dumps_typed("PRE-DELTA-WRITE"),
             "",
         )
@@ -674,19 +651,15 @@ class TestPreDeltaBlobTerminator:
 
         # Seed came from the pre-delta blob at cp1.
         assert result["seed"] == ["A"]
-        # The seed ancestor's own write and the delta-era write from cp2 both
-        # replay through the reducer on top of the seed, oldest first. cp3 is
-        # the target — its own write is pending for the NEXT step and must be
-        # excluded.
+        # Delta-era writes from cp2 replay through the reducer on top of seed.
+        # cp3 is the target — its own write is pending for the NEXT step and
+        # must be excluded.
         values = [v for _, _, v in result["writes"]]
-        assert values == ["PRE-DELTA-WRITE", "B"]
+        assert values == ["B"]
 
-    def test_seed_bounds_walk_without_dropping_its_own_writes(self) -> None:
-        """The seed terminator bounds the walk: writes at ancestors OLDER than
-        the seed are already folded into the seed value and must not be
-        replayed. The seed ancestor's own write is not one of them — it
-        postdates the stored value and produced the next checkpoint.
-        """
+    def test_pre_delta_blob_terminates_walk_before_older_writes(self) -> None:
+        """Writes stored at the pre-delta ancestor itself must not be replayed
+        (the blob subsumes them)."""
         saver, thread_id, ns, channel, target = self._build_mixed_thread()
         config: RunnableConfig = {
             "configurable": {
@@ -701,9 +674,7 @@ class TestPreDeltaBlobTerminator:
         ]
 
         values = [v for _, _, v in result["writes"]]
-        # Older than the seed — subsumed by cp1's blob, so the walk stops first.
-        assert "OLDER-WRITE" not in values
-        # Stored AT the seed ancestor — not subsumed, so it must be replayed.
-        assert "PRE-DELTA-WRITE" in values
+        # The pre-delta write under cp1 must not appear (the blob subsumes it).
+        assert "PRE-DELTA-WRITE" not in values
         # And the pending write at the target is never folded in.
         assert "PENDING-AT-TARGET" not in values

libs/checkpoint/uv.lock

@@ -300,7 +300,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },

libs/cli/langgraph_cli/analytics.py

@@ -48,9 +48,6 @@ def get_anonymized_params(
     if kwargs.get("docker_compose"):
         params["docker_compose"] = True
 
-    if kwargs.get("debugger_port"):
-        params["debugger_port"] = True
-
     if kwargs.get("postgres_uri"):
         params["postgres_uri"] = True
 

libs/cli/langgraph_cli/cli.py

@@ -5,6 +5,7 @@ import pathlib
 import shutil
 import sys
 from collections.abc import Sequence
+from urllib.parse import SplitResult, urlencode, urlsplit, urlunsplit
 
 import click
 import click.exceptions
@@ -140,17 +141,6 @@ OPT_VERBOSE = click.option(
     help="Show more output from the server logs",
 )
 OPT_WATCH = click.option("--watch", is_flag=True, help="Restart on file changes")
-OPT_DEBUGGER_PORT = click.option(
-    "--debugger-port",
-    type=int,
-    help="Pull the debugger image locally and serve the UI on specified port",
-)
-OPT_DEBUGGER_BASE_URL = click.option(
-    "--debugger-base-url",
-    type=str,
-    help="URL used by the debugger to access LangGraph API. Defaults to http://127.0.0.1:[PORT]",
-)
-
 OPT_POSTGRES_URI = click.option(
     "--postgres-uri",
     help="Postgres URI to use for the database. Defaults to launching a local database",
@@ -242,18 +232,94 @@ cli.add_command(deploy)
 # ---------------------------------------------------------------------------
 
 
+def _validated_http_url(value: str, option_name: str) -> SplitResult:
+    try:
+        parsed = urlsplit(value)
+        hostname = parsed.hostname
+        _ = parsed.port
+    except ValueError as exc:
+        raise click.UsageError(
+            f"{option_name} must be a valid HTTP(S) URL without credentials."
+        ) from exc
+
+    if (
+        value != value.strip()
+        or parsed.scheme not in {"http", "https"}
+        or not parsed.netloc
+        or not hostname
+        or parsed.username is not None
+        or parsed.password is not None
+    ):
+        raise click.UsageError(
+            f"{option_name} must be a valid HTTP(S) URL without credentials."
+        )
+    return parsed
+
+
+def _studio_link(
+    *,
+    port: int,
+    studio_url: str | None,
+    api_url: str | None,
+    debugger_base_url: str | None,
+) -> str:
+    if debugger_base_url is not None:
+        if api_url is not None and api_url != debugger_base_url:
+            raise click.UsageError(
+                "--api-url and --debugger-base-url cannot specify different URLs."
+            )
+        click.echo(
+            "Warning: --debugger-base-url is deprecated; use --api-url instead.",
+            err=True,
+        )
+        api_url = debugger_base_url
+
+    studio_url = "https://smith.langchain.com" if studio_url is None else studio_url
+    api_url = f"http://127.0.0.1:{port}" if api_url is None else api_url
+    studio_parts = _validated_http_url(studio_url, "--studio-url")
+    _validated_http_url(api_url, "--api-url")
+    if studio_parts.query or studio_parts.fragment:
+        raise click.UsageError(
+            "--studio-url must not include a query string or fragment."
+        )
+
+    studio_path = f"{studio_parts.path.rstrip('/')}/studio/"
+    return urlunsplit(
+        studio_parts._replace(
+            path=studio_path,
+            query=urlencode({"baseUrl": api_url}),
+        )
+    )
+
+
 @OPT_RECREATE
 @OPT_PULL
 @OPT_PORT
 @OPT_DOCKER_COMPOSE
 @OPT_CONFIG
 @OPT_VERBOSE
-@OPT_DEBUGGER_PORT
-@OPT_DEBUGGER_BASE_URL
 @OPT_WATCH
 @OPT_POSTGRES_URI
 @OPT_API_VERSION
 @OPT_ENGINE_RUNTIME_MODE
+@click.option(
+    "--studio-url",
+    type=str,
+    default=None,
+    help="URL of the LangGraph Studio instance. Defaults to https://smith.langchain.com",
+)
+@click.option(
+    "--api-url",
+    type=str,
+    default=None,
+    help="URL that LangGraph Studio uses to access the API. Defaults to http://127.0.0.1:[PORT]",
+)
+@click.option(
+    "--debugger-base-url",
+    type=str,
+    default=None,
+    hidden=True,
+)
 @click.option(
     "--image",
     type=str,
@@ -284,14 +350,21 @@ def up(
     watch: bool,
     wait: bool,
     verbose: bool,
-    debugger_port: int | None,
-    debugger_base_url: str | None,
     postgres_uri: str | None,
     api_version: str | None,
     engine_runtime_mode: str,
+    studio_url: str | None,
+    api_url: str | None,
+    debugger_base_url: str | None,
     image: str | None,
     base_image: str | None,
 ):
+    studio_link = _studio_link(
+        port=port,
+        studio_url=studio_url,
+        api_url=api_url,
+        debugger_base_url=debugger_base_url,
+    )
     click.secho("Starting LangGraph API server...", fg="green")
     click.secho(
         """For local dev, requires env var LANGSMITH_API_KEY with access to LangSmith Deployment.
@@ -308,8 +381,6 @@ For production use, requires a license key in env var LANGGRAPH_CLOUD_LICENSE_KE
             pull=pull,
             watch=watch,
             verbose=verbose,
-            debugger_port=debugger_port,
-            debugger_base_url=debugger_base_url,
             postgres_uri=postgres_uri,
             api_version=api_version,
             engine_runtime_mode=engine_runtime_mode,
@@ -337,20 +408,12 @@ For production use, requires a license key in env var LANGGRAPH_CLOUD_LICENSE_KE
             if "unpacking to docker.io" in line:
                 set("Starting...")
             elif "Application startup complete" in line:
-                debugger_origin = (
-                    f"http://localhost:{debugger_port}"
-                    if debugger_port
-                    else "https://smith.langchain.com"
-                )
-                debugger_base_url_query = (
-                    debugger_base_url or f"http://127.0.0.1:{port}"
-                )
                 set("")
                 sys.stdout.write(
                     f"""Ready!
 - API: http://localhost:{port}
 - Docs: http://localhost:{port}/docs
-- LangGraph Studio: {debugger_origin}/studio/?baseUrl={debugger_base_url_query}
+- LangGraph Studio: {studio_link}
 """
                 )
                 sys.stdout.flush()
@@ -935,8 +998,6 @@ def prepare_args_and_stdin(
     docker_compose: pathlib.Path | None,
     port: int,
     watch: bool,
-    debugger_port: int | None = None,
-    debugger_base_url: str | None = None,
     postgres_uri: str | None = None,
     api_version: str | None = None,
     engine_runtime_mode: str = "combined_queue_worker",
@@ -950,8 +1011,6 @@ def prepare_args_and_stdin(
     stdin = langgraph_cli.docker.compose(
         capabilities,
         port=port,
-        debugger_port=debugger_port,
-        debugger_base_url=debugger_base_url,
         postgres_uri=postgres_uri,
         image=image,
         base_image=base_image,
@@ -989,8 +1048,6 @@ def prepare(
     pull: bool,
     watch: bool,
     verbose: bool,
-    debugger_port: int | None = None,
-    debugger_base_url: str | None = None,
     postgres_uri: str | None = None,
     api_version: str | None = None,
     engine_runtime_mode: str = "combined_queue_worker",
@@ -1032,8 +1089,6 @@ def prepare(
         docker_compose=docker_compose,
         port=port,
         watch=watch,
-        debugger_port=debugger_port,
-        debugger_base_url=debugger_base_url or f"http://127.0.0.1:{port}",
         postgres_uri=postgres_uri,
         api_version=api_version,
         engine_runtime_mode=engine_runtime_mode,

libs/cli/langgraph_cli/docker.py

@@ -142,29 +142,6 @@ def check_capabilities(runner) -> DockerCapabilities:
     )
 
 
-def debugger_compose(*, port: int | None = None, base_url: str | None = None) -> dict:
-    if port is None:
-        return ""
-
-    config = {
-        "langgraph-debugger": {
-            "image": "langchain/langgraph-debugger",
-            "restart": "on-failure",
-            "depends_on": {
-                "langgraph-postgres": {"condition": "service_healthy"},
-            },
-            "ports": [f'"{port}:3968"'],
-        }
-    }
-
-    if base_url:
-        config["langgraph-debugger"]["environment"] = {
-            "VITE_STUDIO_LOCAL_GRAPH_URL": base_url
-        }
-
-    return config
-
-
 # Function to convert dictionary to YAML
 def dict_to_yaml(d: dict, *, indent: int = 0) -> str:
     """Convert a dictionary to a YAML string."""
@@ -191,8 +168,6 @@ def compose_as_dict(
     capabilities: DockerCapabilities,
     *,
     port: int,
-    debugger_port: int | None = None,
-    debugger_base_url: str | None = None,
     # postgres://user:password@host:port/database?option=value
     postgres_uri: str | None = None,
     # If you are running against an already-built image, you can pass it here
@@ -253,12 +228,6 @@ def compose_as_dict(
         else:
             services["langgraph-postgres"]["healthcheck"]["interval"] = "5s"
 
-    # Add optional debugger service if debugger_port is specified
-    if debugger_port:
-        services["langgraph-debugger"] = debugger_compose(
-            port=debugger_port, base_url=debugger_base_url
-        )["langgraph-debugger"]
-
     # Add langgraph-api service
     api_environment = {
         "REDIS_URI": "redis://langgraph-redis:6379",
@@ -305,8 +274,6 @@ def compose(
     capabilities: DockerCapabilities,
     *,
     port: int,
-    debugger_port: int | None = None,
-    debugger_base_url: str | None = None,
     # postgres://user:password@host:port/database?option=value
     postgres_uri: str | None = None,
     image: str | None = None,
@@ -318,8 +285,6 @@ def compose(
     compose_content = compose_as_dict(
         capabilities,
         port=port,
-        debugger_port=debugger_port,
-        debugger_base_url=debugger_base_url,
         postgres_uri=postgres_uri,
         image=image,
         base_image=base_image,

libs/cli/pyproject.toml

@@ -72,15 +72,9 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
-  "PLC0415",  # import-outside-top-level
-  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph_cli/**" = ["PLC0415"], "generate_schema.py" = ["PLC0415"] }
 target-version = "py310"
 
 [tool.ty.rules]

libs/cli/tests/unit_tests/cli/test_cli.py

@@ -8,10 +8,11 @@ from contextlib import contextmanager
 from pathlib import Path
 
 import click
+import pytest
 from click.testing import CliRunner
 
 import langgraph_cli.deploy as deploy_module
-from langgraph_cli.cli import cli, prepare_args_and_stdin
+from langgraph_cli.cli import _studio_link, cli, prepare_args_and_stdin
 from langgraph_cli.config import Config, _get_pip_cleanup_lines, validate_config
 from langgraph_cli.docker import DEFAULT_POSTGRES_URI, DockerCapabilities, Version
 from langgraph_cli.util import clean_empty_lines
@@ -56,8 +57,6 @@ def test_prepare_args_and_stdin() -> None:
         Config(dependencies=[".", "../../.."], graphs={"agent": "agent.py:graph"})
     )
     port = 8000
-    debugger_port = 8001
-    debugger_graph_url = f"http://127.0.0.1:{port}"
 
     actual_args, actual_stdin = prepare_args_and_stdin(
         capabilities=DEFAULT_DOCKER_CAPABILITIES,
@@ -65,8 +64,6 @@ def test_prepare_args_and_stdin() -> None:
         config=config,
         docker_compose=pathlib.Path("custom-docker-compose.yml"),
         port=port,
-        debugger_port=debugger_port,
-        debugger_base_url=debugger_graph_url,
         watch=True,
     )
 
@@ -110,16 +107,6 @@ services:
             retries: 5
             interval: 60s
             start_interval: 1s
-    langgraph-debugger:
-        image: langchain/langgraph-debugger
-        restart: on-failure
-        depends_on:
-            langgraph-postgres:
-                condition: service_healthy
-        ports:
-            - "{debugger_port}:3968"
-        environment:
-            VITE_STUDIO_LOCAL_GRAPH_URL: {debugger_graph_url}
     langgraph-api:
         ports:
             - "8000:8000"
@@ -178,8 +165,6 @@ def test_prepare_args_and_stdin_with_image() -> None:
         Config(dependencies=[".", "../../.."], graphs={"agent": "agent.py:graph"})
     )
     port = 8000
-    debugger_port = 8001
-    debugger_graph_url = f"http://127.0.0.1:{port}"
 
     actual_args, actual_stdin = prepare_args_and_stdin(
         capabilities=DEFAULT_DOCKER_CAPABILITIES,
@@ -187,8 +172,6 @@ def test_prepare_args_and_stdin_with_image() -> None:
         config=config,
         docker_compose=pathlib.Path("custom-docker-compose.yml"),
         port=port,
-        debugger_port=debugger_port,
-        debugger_base_url=debugger_graph_url,
         watch=True,
         image="my-cool-image",
     )
@@ -233,16 +216,6 @@ services:
             retries: 5
             interval: 60s
             start_interval: 1s
-    langgraph-debugger:
-        image: langchain/langgraph-debugger
-        restart: on-failure
-        depends_on:
-            langgraph-postgres:
-                condition: service_healthy
-        ports:
-            - "{debugger_port}:3968"
-        environment:
-            VITE_STUDIO_LOCAL_GRAPH_URL: {debugger_graph_url}
     langgraph-api:
         ports:
             - "8000:8000"
@@ -289,6 +262,82 @@ def test_version_option() -> None:
     )
 
 
+def test_up_help_shows_hosted_studio_options() -> None:
+    result = CliRunner().invoke(cli, ["up", "--help"])
+
+    assert result.exit_code == 0, result.output
+    assert "--studio-url" in result.output
+    assert "--api-url" in result.output
+    assert "--debugger-port" not in result.output
+    assert "--debugger-base-url" not in result.output
+
+
+def test_studio_link_defaults_to_hosted_studio() -> None:
+    assert _studio_link(
+        port=8123,
+        studio_url=None,
+        api_url=None,
+        debugger_base_url=None,
+    ) == ("https://smith.langchain.com/studio/?baseUrl=http%3A%2F%2F127.0.0.1%3A8123")
+
+
+def test_studio_link_supports_self_hosted_and_remote_urls() -> None:
+    assert _studio_link(
+        port=8123,
+        studio_url="https://langsmith.example.com/prefix/",
+        api_url="https://api.example.com/graph?tenant=a&region=eu",
+        debugger_base_url=None,
+    ) == (
+        "https://langsmith.example.com/prefix/studio/"
+        "?baseUrl=https%3A%2F%2Fapi.example.com%2Fgraph%3Ftenant%3Da%26region%3Deu"
+    )
+
+
+def test_studio_link_supports_deprecated_debugger_base_url(capsys) -> None:
+    assert _studio_link(
+        port=8123,
+        studio_url=None,
+        api_url=None,
+        debugger_base_url="https://api.example.com",
+    ).endswith("?baseUrl=https%3A%2F%2Fapi.example.com")
+    assert "--debugger-base-url is deprecated; use --api-url" in capsys.readouterr().err
+
+
+@pytest.mark.parametrize(
+    ("studio_url", "api_url"),
+    [
+        ("javascript:alert(1)", None),
+        ("https://user:password@example.com", None),
+        ("https://smith.langchain.com?workspace=test", None),
+        (None, "file:///tmp/langgraph.sock"),
+        (None, "https://user:password@example.com"),
+    ],
+)
+def test_studio_link_rejects_unsafe_urls(
+    studio_url: str | None, api_url: str | None
+) -> None:
+    with pytest.raises(click.UsageError):
+        _studio_link(
+            port=8123,
+            studio_url=studio_url,
+            api_url=api_url,
+            debugger_base_url=None,
+        )
+
+
+def test_studio_link_rejects_conflicting_api_url_aliases() -> None:
+    with pytest.raises(
+        click.UsageError,
+        match="cannot specify different URLs",
+    ):
+        _studio_link(
+            port=8123,
+            studio_url=None,
+            api_url="https://api.example.com",
+            debugger_base_url="https://other.example.com",
+        )
+
+
 def test_top_level_help_shows_deploy_subcommands() -> None:
     runner = CliRunner()
 

libs/cli/tests/unit_tests/test_archive.py

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

libs/cli/tests/unit_tests/test_deploy_helpers.py

@@ -347,6 +347,7 @@ class TestCallHostBackendWithOptionalTenant:
 
     def test_workspace_prompt_blocked_by_no_input(self, monkeypatch):
         """With _no_input=True, 403 requiring workspace should raise ClickException."""
+        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
 
@@ -514,6 +515,7 @@ class TestEmitterTextMode:
 
 class TestCreateHostBackendClientNoInput:
     def test_raises_when_no_api_key_and_no_input(self, monkeypatch, tmp_path):
+        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
         monkeypatch.delenv("LANGSMITH_API_KEY", raising=False)
@@ -528,6 +530,7 @@ class TestCreateHostBackendClientNoInput:
             )
 
     def test_succeeds_with_api_key_in_env(self, monkeypatch, tmp_path):
+        import langgraph_cli.deploy as deploy_mod
 
         monkeypatch.setattr(deploy_mod, "_no_input", True)
         monkeypatch.setenv("LANGSMITH_API_KEY", "lsv2_test")

libs/cli/tests/unit_tests/test_docker.py

@@ -16,7 +16,7 @@ DEFAULT_DOCKER_CAPABILITIES = DockerCapabilities(
 )
 
 
-def test_compose_with_no_debugger_and_custom_db():
+def test_compose_with_custom_db():
     port = 8123
     custom_postgres_uri = "custom_postgres_uri"
     actual_compose_str = compose(
@@ -42,7 +42,7 @@ def test_compose_with_no_debugger_and_custom_db():
     assert clean_empty_lines(actual_compose_str) == expected_compose_str
 
 
-def test_compose_with_no_debugger_and_custom_db_with_healthcheck():
+def test_compose_with_custom_db_and_healthcheck():
     port = 8123
     custom_postgres_uri = "custom_postgres_uri"
     actual_compose_str = compose(
@@ -75,35 +75,7 @@ def test_compose_with_no_debugger_and_custom_db_with_healthcheck():
     assert clean_empty_lines(actual_compose_str) == expected_compose_str
 
 
-def test_compose_with_debugger_and_custom_db():
-    port = 8123
-    custom_postgres_uri = "custom_postgres_uri"
-    actual_compose_str = compose(
-        DEFAULT_DOCKER_CAPABILITIES,
-        port=port,
-        postgres_uri=custom_postgres_uri,
-    )
-    expected_compose_str = f"""services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-api:
-        ports:
-            - "{port}:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: {custom_postgres_uri}"""
-    assert clean_empty_lines(actual_compose_str) == expected_compose_str
-
-
-def test_compose_with_debugger_and_default_db():
+def test_compose_with_default_db():
     port = 8123
     actual_compose_str = compose(DEFAULT_DOCKER_CAPABILITIES, port=port)
     expected_compose_str = f"""volumes:
@@ -302,72 +274,6 @@ def test_compose_with_api_version_and_custom_postgres():
     assert clean_empty_lines(actual_compose_str) == expected_compose_str
 
 
-def test_compose_with_api_version_and_debugger():
-    """Test compose function with api_version and debugger port."""
-    port = 8123
-    debugger_port = 8001
-    api_version = "0.2.74"
-
-    actual_compose_str = compose(
-        DEFAULT_DOCKER_CAPABILITIES,
-        port=port,
-        api_version=api_version,
-        debugger_port=debugger_port,
-    )
-
-    expected_compose_str = f"""volumes:
-    langgraph-data:
-        driver: local
-services:
-    langgraph-redis:
-        image: redis:6
-        healthcheck:
-            test: redis-cli ping
-            interval: 5s
-            timeout: 1s
-            retries: 5
-    langgraph-postgres:
-        image: pgvector/pgvector:pg16
-        ports:
-            - "5433:5432"
-        environment:
-            POSTGRES_DB: postgres
-            POSTGRES_USER: postgres
-            POSTGRES_PASSWORD: postgres
-        command:
-            - postgres
-            - -c
-            - shared_preload_libraries=vector
-        volumes:
-            - langgraph-data:/var/lib/postgresql/data
-        healthcheck:
-            test: pg_isready -U postgres
-            start_period: 10s
-            timeout: 1s
-            retries: 5
-            interval: 5s
-    langgraph-debugger:
-        image: langchain/langgraph-debugger
-        restart: on-failure
-        depends_on:
-            langgraph-postgres:
-                condition: service_healthy
-        ports:
-            - "{debugger_port}:3968"
-    langgraph-api:
-        ports:
-            - "{port}:8000"
-        depends_on:
-            langgraph-redis:
-                condition: service_healthy
-            langgraph-postgres:
-                condition: service_healthy
-        environment:
-            REDIS_URI: redis://langgraph-redis:6379
-            POSTGRES_URI: {DEFAULT_POSTGRES_URI}"""
-    assert clean_empty_lines(actual_compose_str) == expected_compose_str
-
-
 def test_compose_distributed_mode_with_custom_db():
     """Test compose with engine_runtime_mode='distributed' adds N_JOBS_PER_WORKER=0."""
     port = 8123

libs/langgraph/langgraph/_internal/_pydantic.py

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

libs/langgraph/langgraph/_internal/_runnable.py

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

libs/langgraph/langgraph/_internal/_serde.py

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

libs/langgraph/langgraph/errors.py

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

libs/langgraph/langgraph/graph/_node.py

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

libs/langgraph/langgraph/graph/state.py

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

libs/langgraph/langgraph/pregel/_read.py

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

libs/langgraph/langgraph/pregel/_utils.py

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

libs/langgraph/langgraph/types.py

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

libs/langgraph/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph"
-version = "1.2.11"
+version = "1.2.10"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -89,12 +89,8 @@ langgraph-sdk = { path = "../sdk-py", editable = true }
 langgraph-cli = { path = "../cli", editable = true }
 
 [tool.ruff]
-lint.select = [ "E", "F", "I", "PLC0415", "RUF100", "TID251", "UP" ]
+lint.select = [ "E", "F", "I", "TID251", "UP" ]
 lint.ignore = [ "E501" ]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 line-length = 88
 indent-width = 4
 extend-include = ["*.ipynb"]

libs/langgraph/tests/memory_assert.py

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

libs/langgraph/tests/test_channels.py

@@ -2,16 +2,14 @@ import operator
 from collections.abc import Sequence
 from typing import Annotated
 
-import orjson
 import pytest
 from langchain_core.messages import AIMessage, HumanMessage, RemoveMessage
 from langgraph.checkpoint.memory import InMemorySaver
 from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from typing_extensions import NotRequired, TypedDict
 
-from langgraph._internal._constants import OVERWRITE
 from langgraph._internal._typing import MISSING
-from langgraph.channels.binop import BinaryOperatorAggregate, _get_overwrite
+from langgraph.channels.binop import BinaryOperatorAggregate
 from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.topic import Topic
@@ -196,6 +194,10 @@ def test_overwrite_dataclass_form_survives_json_roundtrip() -> None:
     ...}`) is indistinguishable from a literal channel value, and downstream
     reducers raise `MESSAGE_COERCION_FAILURE` (or similar) on read.
     """
+    import orjson
+
+    from langgraph._internal._constants import OVERWRITE
+    from langgraph.channels.binop import _get_overwrite
 
     ow = Overwrite(value=[HumanMessage(content="new", id="h2")])
     erased = orjson.loads(orjson.dumps(ow, default=lambda o: o.model_dump()))
@@ -211,6 +213,8 @@ def test_overwrite_sentinel_dict_still_recognised() -> None:
     """The pre-existing `{"__overwrite__": value}` dict form continues to be
     recognised. This is the canonical sentinel emitted by producers that do
     not have an `Overwrite` dataclass available."""
+    from langgraph._internal._constants import OVERWRITE
+    from langgraph.channels.binop import _get_overwrite
 
     is_overwrite, value = _get_overwrite({OVERWRITE: ["b"]})
     assert is_overwrite
@@ -220,6 +224,7 @@ def test_overwrite_sentinel_dict_still_recognised() -> None:
 def test_overwrite_non_matching_dict_not_recognised() -> None:
     """Dicts that resemble the erased shape but do not carry the
     `__overwrite__` discriminator must not be misclassified as overwrites."""
+    from langgraph.channels.binop import _get_overwrite
 
     assert _get_overwrite({"value": ["b"]}) == (False, None)
     assert _get_overwrite({"type": "human", "value": "hi"}) == (False, None)

libs/langgraph/tests/test_config_async.py

@@ -24,7 +24,7 @@ class _TrackingCallback(BaseCallbackHandler):
     def __init__(self) -> None:
         self.called = False
 
-    def on_chain_start(self, *args, **kwargs) -> None:
+    def on_chain_start(self, *args, **kwargs) -> None:  # noqa: ANN002, ANN003
         self.called = True
 
 
@@ -55,7 +55,7 @@ async def test_with_config_configurable_preserved_on_invoke() -> None:
     builder = StateGraph(dict)
     captured: dict = {}
 
-    def node(state, config):
+    def node(state, config):  # noqa: ANN001
         captured.update(config.get("configurable") or {})
         return state
 
@@ -79,7 +79,7 @@ async def test_with_config_metadata_preserved_on_invoke() -> None:
     builder = StateGraph(dict)
     captured: dict = {}
 
-    def node(state, config):
+    def node(state, config):  # noqa: ANN001
         captured.update(config.get("metadata") or {})
         return state
 
@@ -104,7 +104,7 @@ async def test_with_config_tags_preserved_on_invoke() -> None:
     builder = StateGraph(dict)
     captured: list = []
 
-    def node(state, config):
+    def node(state, config):  # noqa: ANN001
         captured.extend(config.get("tags") or [])
         return state
 

libs/langgraph/tests/test_delta_channel_benchmark.py

@@ -220,7 +220,7 @@ def _checkpointers() -> list[tuple[str, Any]]:
     result: list[tuple[str, Any]] = [("InMemory", None)]
     if _POSTGRES_AVAILABLE:
         try:
-            import psycopg  # noqa: PLC0415
+            import psycopg
 
             psycopg.connect(_POSTGRES_URI).close()
             result.append(("Postgres", "postgres"))

libs/langgraph/tests/test_delta_channel_migration.py

@@ -616,117 +616,3 @@ async def test_add_messages_to_delta_migration_preserves_message_history_async()
     assert [m.id for m in snap.values["messages"]] == ["h1", "a1"], (
         f"async tip hydration mismatch: got {[m.id for m in snap.values['messages']]}"
     )
-
-
-# ---------------------------------------------------------------------------
-# 8. First post-migration write, read back cold (regression for #8384)
-#
-# The migration boundary produces a checkpoint that carries BOTH a pre-delta
-# plain-value blob AND the pending write that produced its (delta-era) child.
-# That write is not subsumed by the blob — the blob is the value ENTERING that
-# checkpoint. A saver whose ancestor walk skips the seed checkpoint's own
-# writes silently drops the first post-migration write.
-#
-# The failure is invisible to the live `invoke` return value (computed
-# in-memory before persistence), so these tests must assert on a COLD read.
-# It is also invisible at `snapshot_frequency=1`, where every write is its own
-# snapshot boundary and the walk never terminates on a plain value — hence the
-# explicit default-frequency coverage.
-# ---------------------------------------------------------------------------
-
-
-def test_first_post_migration_write_survives_cold_read() -> None:
-    """One non-snapshotting write after migrating a thread to `DeltaChannel`
-    must still be present when the state is read back from the checkpointer.
-
-    Regression for #8384: `invoke` returned the correct value while
-    `get_state` dropped the write permanently.
-    """
-
-    checkpointer = InMemorySaver()
-    config = {"configurable": {"thread_id": "first-post-migration"}}
-
-    binop = _binop_graph(checkpointer)
-    binop.invoke({"items": ["a"]}, config)
-
-    delta = _delta_graph(checkpointer)
-    live = delta.invoke({"items": ["b"]}, config)
-    assert list(live["items"]) == ["a", "b"], "live invoke lost the write"
-
-    cold = delta.get_state(config)
-    assert list(cold.values["items"]) == ["a", "b"], (
-        "first post-migration write dropped on cold read: "
-        f"got {list(cold.values['items'])}"
-    )
-
-
-async def test_first_post_migration_write_survives_cold_read_async() -> None:
-    """Async variant of the #8384 regression."""
-
-    checkpointer = InMemorySaver()
-    config = {"configurable": {"thread_id": "first-post-migration-async"}}
-
-    binop = _binop_graph(checkpointer)
-    await binop.ainvoke({"items": ["a"]}, config)
-
-    delta = _delta_graph(checkpointer)
-    live = await delta.ainvoke({"items": ["b"]}, config)
-    assert list(live["items"]) == ["a", "b"], "live ainvoke lost the write"
-
-    cold = await delta.aget_state(config)
-    assert list(cold.values["items"]) == ["a", "b"], (
-        "first post-migration write dropped on cold read: "
-        f"got {list(cold.values['items'])}"
-    )
-
-
-def test_post_migration_writes_match_base_saver_fallback() -> None:
-    """Parity across the migration boundary WITH post-migration writes.
-
-    `test_base_saver_fallback_matches_optimized_override` only reads a
-    pre-migration chain, so the optimized override and the reference walk
-    never disagree there. Driving writes after the migration is what
-    separates them.
-    """
-
-    def _run(saver: Any, thread: str) -> list[tuple[Any, list]]:
-        config = {"configurable": {"thread_id": thread}}
-        _drive(_binop_graph(saver), config, "u", 2)
-        delta = _delta_graph(saver)
-        _drive(delta, config, "d", 3)
-        return [
-            (s.next, list(s.values.get("items", [])))
-            for s in delta.get_state_history(config)
-        ]
-
-    fast = _run(InMemorySaver(), "fast")
-    slow = _run(_ThirdPartyStyleSaver(), "slow")
-
-    assert fast == slow, (
-        "optimized override diverges from the base-saver fallback once "
-        f"post-migration writes exist; fast={fast}, slow={slow}"
-    )
-    # Guard the assertion above against both paths being wrong in the same way.
-    assert fast[0][1] == ["u0", "u1", "d0", "d1", "d2"], (
-        f"unexpected accumulated state: {fast[0][1]}"
-    )
-
-
-def test_add_messages_migration_keeps_first_post_migration_message() -> None:
-    """The `add_messages` -> `DeltaChannel` path is the one Deep Agents takes;
-    dropping the first post-migration write loses a real user message.
-    """
-
-    checkpointer = InMemorySaver()
-    config = {"configurable": {"thread_id": "add-messages-first-write"}}
-
-    pre_graph = _add_messages_graph(checkpointer)
-    pre_graph.invoke({"messages": [HumanMessage(content="hello", id="h1")]}, config)
-
-    delta_graph = _delta_messages_graph(checkpointer)
-    delta_graph.invoke({"messages": [HumanMessage(content="second", id="h2")]}, config)
-
-    ids = [m.id for m in delta_graph.get_state(config).values["messages"]]
-    # h1 is the pre-migration seed, h2 the write that was being dropped; both
-    # have to survive, and in order.
-    assert ids == ["h1", "h2"], f"expected ['h1', 'h2'], got {ids}"

libs/langgraph/tests/test_delta_channel_update_state.py

@@ -27,7 +27,6 @@ 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
 
 pytestmark = pytest.mark.anyio
 
@@ -278,6 +277,7 @@ def test_bulk_update_state_multi_task_per_superstep_delta_channel() -> None:
     different `StateUpdate`s targeting the same node — otherwise both share
     the deterministic interrupt-derived id and collide in the saver.
     """
+    from langgraph.types import StateUpdate
 
     saver = InMemorySaver()
     graph = _build_graph(saver)

libs/langgraph/tests/test_deprecation.py

@@ -88,13 +88,13 @@ def test_constants_deprecation() -> None:
         LangGraphDeprecatedSinceV10,
         match="Importing Send from langgraph.constants is deprecated. Please use 'from langgraph.types import Send' instead.",
     ):
-        from langgraph.constants import Send  # noqa: PLC0415, F401
+        from langgraph.constants import Send  # noqa: F401
 
     with pytest.warns(
         LangGraphDeprecatedSinceV10,
         match="Importing Interrupt from langgraph.constants is deprecated. Please use 'from langgraph.types import Interrupt' instead.",
     ):
-        from langgraph.constants import Interrupt  # noqa: PLC0415, F401
+        from langgraph.constants import Interrupt  # noqa: F401
 
 
 def test_pregel_types_deprecation() -> None:
@@ -102,7 +102,7 @@ def test_pregel_types_deprecation() -> None:
         LangGraphDeprecatedSinceV10,
         match="Importing from langgraph.pregel.types is deprecated. Please use 'from langgraph.types import ...' instead.",
     ):
-        from langgraph.pregel.types import StateSnapshot  # noqa: PLC0415, F401
+        from langgraph.pregel.types import StateSnapshot  # noqa: F401
 
 
 def test_config_schema_deprecation() -> None:
@@ -195,7 +195,7 @@ def test_deprecated_import() -> None:
         LangGraphDeprecatedSinceV10,
         match="Importing PREVIOUS from langgraph.constants is deprecated. This constant is now private and should not be used directly.",
     ):
-        from langgraph.constants import PREVIOUS  # noqa: PLC0415, F401
+        from langgraph.constants import PREVIOUS  # noqa: F401
 
 
 @pytest.mark.filterwarnings(

libs/langgraph/tests/test_graph_callbacks.py

@@ -13,7 +13,6 @@ from langgraph.callbacks import (
     GraphCallbackHandler,
     GraphInterruptEvent,
     GraphResumeEvent,
-    _GraphCallbackManager,
 )
 from langgraph.graph import START, StateGraph
 from langgraph.types import Command, Interrupt, interrupt
@@ -287,6 +286,7 @@ def test_non_graph_handler_via_add_handler_does_not_crash() -> None:
     GraphCallbackHandler. They must be silently accepted — graph lifecycle
     events will simply not be dispatched to them.
     """
+    from langgraph.callbacks import _GraphCallbackManager
 
     manager = _GraphCallbackManager()
     plain_handler = _LangChainCustomEventHandler()

libs/langgraph/tests/test_large_cases.py

@@ -2,26 +2,11 @@ import json
 import operator
 import re
 import time
-from copy import deepcopy
 from dataclasses import replace
 from typing import Annotated, Any, Literal, cast
 
 import pytest
-from langchain_core.callbacks import CallbackManagerForLLMRun
-from langchain_core.language_models.fake import FakeStreamingListLLM
-from langchain_core.language_models.fake_chat_models import (
-    FakeMessagesListChatModel,
-)
-from langchain_core.messages import (
-    AIMessage,
-    AnyMessage,
-    BaseMessage,
-    HumanMessage,
-    ToolCall,
-    ToolMessage,
-)
-from langchain_core.outputs import ChatGeneration, ChatResult
-from langchain_core.prompts import PromptTemplate
+from langchain_core.messages import AIMessage, AnyMessage, ToolCall
 from langchain_core.runnables import RunnableConfig, RunnableMap, RunnablePick
 from langchain_core.tools import tool
 from langchain_core.version import VERSION as LANGCHAIN_CORE_VERSION
@@ -499,6 +484,9 @@ def test_conditional_state_graph(
     snapshot: SnapshotAssertion,
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langchain_core.language_models.fake import FakeStreamingListLLM
+    from langchain_core.prompts import PromptTemplate
+    from langchain_core.tools import tool
 
     class AgentState(TypedDict, total=False):
         input: Annotated[str, UntrackedValue]
@@ -1273,6 +1261,8 @@ def test_conditional_state_graph(
 
 
 def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage
+    from langchain_core.tools import tool
 
     @tool()
     def search_api(query: str) -> str:
@@ -1636,6 +1626,17 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
 def test_state_graph_packets(
     sync_checkpointer: BaseCheckpointSaver, mocker: MockerFixture
 ) -> None:
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import (
+        AIMessage,
+        BaseMessage,
+        HumanMessage,
+        ToolCall,
+        ToolMessage,
+    )
+    from langchain_core.tools import tool
 
     class AgentState(TypedDict):
         messages: Annotated[list[BaseMessage], add_messages]
@@ -2380,6 +2381,15 @@ def test_message_graph(
     deterministic_uuids: MockerFixture,
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from copy import deepcopy
+
+    from langchain_core.callbacks import CallbackManagerForLLMRun
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import AIMessage, BaseMessage, HumanMessage
+    from langchain_core.outputs import ChatGeneration, ChatResult
+    from langchain_core.tools import tool
 
     class FakeFunctionChatModel(FakeMessagesListChatModel):
         def bind_functions(self, functions: list):
@@ -3089,6 +3099,20 @@ def test_root_graph(
     deterministic_uuids: MockerFixture,
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from copy import deepcopy
+
+    from langchain_core.callbacks import CallbackManagerForLLMRun
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import (
+        AIMessage,
+        BaseMessage,
+        HumanMessage,
+        ToolMessage,
+    )
+    from langchain_core.outputs import ChatGeneration, ChatResult
+    from langchain_core.tools import tool
 
     class FakeFunctionChatModel(FakeMessagesListChatModel):
         def bind_functions(self, functions: list):
@@ -5813,6 +5837,7 @@ def test_send_to_nested_graphs(sync_checkpointer: BaseCheckpointSaver) -> None:
 def test_send_react_interrupt(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage, ToolCall, ToolMessage
 
     ai_message = AIMessage(
         "",
@@ -6203,6 +6228,7 @@ def test_send_react_interrupt(
 def test_send_react_interrupt_control(
     sync_checkpointer: BaseCheckpointSaver, snapshot: SnapshotAssertion
 ) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage, ToolCall, ToolMessage
 
     ai_message = AIMessage(
         "",
@@ -6429,6 +6455,9 @@ def test_send_react_interrupt_control(
 def test_weather_subgraph(
     sync_checkpointer: BaseCheckpointSaver, snapshot: SnapshotAssertion
 ) -> None:
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
 
     # setup subgraph
 

libs/langgraph/tests/test_large_cases_async.py

@@ -9,22 +9,8 @@ from typing import (
 )
 
 import pytest
-from langchain_core.agents import AgentAction, AgentFinish
-from langchain_core.language_models.fake import FakeStreamingListLLM
-from langchain_core.language_models.fake_chat_models import (
-    FakeMessagesListChatModel,
-)
-from langchain_core.messages import (
-    AIMessage,
-    AnyMessage,
-    BaseMessage,
-    HumanMessage,
-    ToolCall,
-    ToolMessage,
-)
-from langchain_core.prompts import PromptTemplate
+from langchain_core.messages import AnyMessage, ToolCall
 from langchain_core.runnables import RunnableConfig, RunnablePick
-from langchain_core.tools import tool
 from langchain_core.version import VERSION as LANGCHAIN_CORE_VERSION
 from langgraph.checkpoint.base import BaseCheckpointSaver
 from langgraph.prebuilt.chat_agent_executor import create_react_agent
@@ -36,7 +22,6 @@ from langgraph._internal._constants import PULL, PUSH
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.untracked_value import UntrackedValue
 from langgraph.constants import END, START
-from langgraph.graph import MessagesState
 from langgraph.graph.message import add_messages
 from langgraph.graph.state import StateGraph
 from langgraph.pregel import NodeBuilder, Pregel
@@ -494,6 +479,10 @@ async def test_fork_always_re_runs_nodes(
 
 
 async def test_conditional_graph_state(async_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.agents import AgentAction, AgentFinish
+    from langchain_core.language_models.fake import FakeStreamingListLLM
+    from langchain_core.prompts import PromptTemplate
+    from langchain_core.tools import tool
 
     class AgentState(TypedDict):
         input: Annotated[str, UntrackedValue]
@@ -1028,6 +1017,8 @@ async def test_conditional_graph_state(async_checkpointer: BaseCheckpointSaver)
 
 
 async def test_prebuilt_tool_chat() -> None:
+    from langchain_core.messages import AIMessage, HumanMessage
+    from langchain_core.tools import tool
 
     model = FakeChatModel(
         messages=[
@@ -1367,6 +1358,16 @@ async def test_prebuilt_tool_chat() -> None:
 
 
 async def test_state_graph_packets(async_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import (
+        AIMessage,
+        BaseMessage,
+        HumanMessage,
+        ToolMessage,
+    )
+    from langchain_core.tools import tool
 
     class AgentState(TypedDict):
         messages: Annotated[list[BaseMessage], add_messages]
@@ -2071,6 +2072,11 @@ async def test_state_graph_packets(async_checkpointer: BaseCheckpointSaver) -> N
 
 
 async def test_message_graph(async_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import AIMessage, HumanMessage
+    from langchain_core.tools import tool
 
     class FakeFunctionChatModel(FakeMessagesListChatModel):
         def bind_functions(self, functions: list):
@@ -3531,6 +3537,13 @@ async def test_send_to_nested_graphs(async_checkpointer: BaseCheckpointSaver) ->
 async def test_weather_subgraph(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import AIMessage, ToolCall
+    from langchain_core.tools import tool
+
+    from langgraph.graph import MessagesState
 
     # setup subgraph
 

libs/langgraph/tests/test_pregel.py

@@ -4,39 +4,25 @@ import gc
 import json
 import logging
 import operator
-import random
 import threading
 import time
 import uuid
-from collections import Counter, defaultdict, deque
+from collections import Counter, deque
 from collections.abc import Sequence
 from concurrent.futures import ThreadPoolExecutor
 from dataclasses import dataclass, field
 from random import randrange
 from typing import Annotated, Any, Literal, get_type_hints
-from unittest.mock import patch
 
 import pytest
 from langchain_core.language_models import GenericFakeChatModel
-from langchain_core.language_models.fake import FakeStreamingListLLM
-from langchain_core.language_models.fake_chat_models import (
-    FakeMessagesListChatModel,
-)
-from langchain_core.messages import (
-    AIMessage,
-    AnyMessage,
-    BaseMessage,
-    HumanMessage,
-    RemoveMessage,
-)
-from langchain_core.prompts import ChatPromptTemplate, PromptTemplate
+from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, RemoveMessage
 from langchain_core.runnables import (
     RunnableConfig,
     RunnableLambda,
     RunnablePassthrough,
 )
 from langchain_core.runnables.graph import Edge
-from langchain_core.tools import tool
 from langchain_core.version import VERSION as LANGCHAIN_CORE_VERSION
 from langgraph.cache.base import BaseCache
 from langgraph.checkpoint.base import (
@@ -70,9 +56,8 @@ from langgraph.pregel import (
     NodeBuilder,
     Pregel,
 )
-from langgraph.pregel._loop import PregelLoop, SyncPregelLoop
+from langgraph.pregel._loop import SyncPregelLoop
 from langgraph.pregel._runner import PregelRunner
-from langgraph.runtime import RunControl
 from langgraph.types import (
     CachePolicy,
     Command,
@@ -140,6 +125,7 @@ def test_graph_validation() -> None:
 def test_request_drain_allows_inflight_call_scheduling(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langgraph.runtime import RunControl
 
     @task
     def child(x: int) -> int:
@@ -1783,6 +1769,9 @@ def test_conditional_state_graph_with_list_edge_inputs(snapshot: SnapshotAsserti
 
 
 def test_state_graph_w_config_inherited_state_keys(snapshot: SnapshotAssertion) -> None:
+    from langchain_core.language_models.fake import FakeStreamingListLLM
+    from langchain_core.prompts import PromptTemplate
+    from langchain_core.tools import tool
 
     class BaseState(TypedDict):
         input: str
@@ -3780,6 +3769,12 @@ def test_checkpoint_metadata(sync_checkpointer: BaseCheckpointSaver) -> None:
     previous checkpoint config for each step in the run.
     """
     # set up test
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import AIMessage, AnyMessage
+    from langchain_core.prompts import ChatPromptTemplate
+    from langchain_core.tools import tool
 
     # graph state
     class BaseState(TypedDict):
@@ -3945,6 +3940,7 @@ def test_checkpoint_metadata(sync_checkpointer: BaseCheckpointSaver) -> None:
 def test_remove_message_via_state_update(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage, RemoveMessage
 
     workflow = StateGraph(state_schema=Annotated[list[AnyMessage], add_messages])  # type: ignore[arg-type]
     workflow.add_node(
@@ -3977,6 +3973,7 @@ def test_remove_message_via_state_update(
 
 
 def test_remove_message_from_node():
+    from langchain_core.messages import AIMessage, HumanMessage, RemoveMessage
 
     workflow = StateGraph(state_schema=Annotated[list[AnyMessage], add_messages])  # type: ignore[arg-type]
     workflow.add_node(
@@ -4002,6 +3999,7 @@ def test_remove_message_from_node():
 
 
 def test_xray_lance(snapshot: SnapshotAssertion):
+    from langchain_core.messages import AnyMessage, HumanMessage
 
     class Analyst(BaseModel):
         affiliation: str = Field(
@@ -4485,6 +4483,7 @@ def test_debug_subgraphs(
 def test_debug_nested_subgraphs(
     sync_checkpointer: BaseCheckpointSaver, durability: Durability
 ):
+    from collections import defaultdict
 
     class State(TypedDict):
         messages: Annotated[list[str], operator.add]
@@ -4744,6 +4743,8 @@ def test_runnable_passthrough_node_graph() -> None:
 def test_parent_command(
     sync_checkpointer: BaseCheckpointSaver, subgraph_persist: bool
 ) -> None:
+    from langchain_core.messages import BaseMessage
+    from langchain_core.tools import tool
 
     @tool(return_direct=True)
     def get_user_name() -> Command:
@@ -5163,6 +5164,7 @@ def test_command_with_static_breakpoints(
 
 
 def test_multistep_plan(sync_checkpointer: BaseCheckpointSaver):
+    from langchain_core.messages import AnyMessage
 
     class State(TypedDict, total=False):
         plan: list[str | list[str]]
@@ -5908,6 +5910,9 @@ def test_no_redundant_put_writes_for_cached_task(
     sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
     """Cached @tasks on resume must not trigger redundant put_writes."""
+    from unittest.mock import patch
+
+    from langgraph.pregel._loop import PregelLoop
 
     @task
     def setup(x: int) -> int:
@@ -6970,6 +6975,7 @@ def test_configurable_propagates_to_stream_metadata() -> None:
 
 
 def test_stream_mode_messages_command() -> None:
+    from langchain_core.messages import HumanMessage
 
     def my_node(state):
         return {"messages": HumanMessage(content="foo")}
@@ -7237,6 +7243,7 @@ def test_get_stream_writer() -> None:
 
 
 def test_stream_messages_dedupe_inputs() -> None:
+    from langchain_core.messages import AIMessage
 
     def call_model(state):
         return {"messages": AIMessage("hi", id="1")}
@@ -7274,6 +7281,7 @@ def test_stream_messages_dedupe_inputs() -> None:
 
 
 def test_stream_messages_dedupe_state(sync_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.messages import AIMessage
 
     to_emit = [AIMessage("bye", id="1"), AIMessage("bye again", id="2")]
 
@@ -8245,6 +8253,7 @@ def test_get_graph_loop(snapshot: SnapshotAssertion) -> None:
 
 
 def test_get_graph_self_loop(snapshot: SnapshotAssertion) -> None:
+    import random
 
     subgraph_builder = StateGraph(MessagesState)
     subgraph_builder.add_node("agent", lambda x: x)

libs/langgraph/tests/test_pregel_async.py

@@ -7,7 +7,7 @@ import operator
 import random
 import sys
 import uuid
-from collections import Counter, defaultdict, deque
+from collections import Counter, deque
 from dataclasses import replace
 from time import perf_counter
 from typing import (
@@ -21,20 +21,8 @@ from uuid import UUID
 
 import pytest
 from langchain_core.language_models import GenericFakeChatModel
-from langchain_core.language_models.fake_chat_models import (
-    FakeMessagesListChatModel,
-)
-from langchain_core.messages import (
-    AIMessage,
-    AnyMessage,
-    BaseMessage,
-    HumanMessage,
-    ToolCall,
-    ToolMessage,
-)
-from langchain_core.prompts import ChatPromptTemplate
+from langchain_core.messages import HumanMessage
 from langchain_core.runnables import RunnableConfig, RunnableLambda, RunnablePassthrough
-from langchain_core.tools import tool
 from langchain_core.utils.aiter import aclosing
 from langchain_core.version import VERSION as LANGCHAIN_CORE_VERSION
 from langgraph.cache.base import BaseCache
@@ -57,7 +45,6 @@ from typing_extensions import NotRequired, TypedDict
 from langgraph._internal._constants import CONFIG_KEY_NODE_FINISHED, ERROR, PULL
 from langgraph._internal._queue import AsyncQueue
 from langgraph.channels.binop import BinaryOperatorAggregate
-from langgraph.channels.delta import DeltaChannel
 from langgraph.channels.last_value import LastValue
 from langgraph.channels.topic import Topic
 from langgraph.errors import (
@@ -68,11 +55,10 @@ from langgraph.errors import (
 )
 from langgraph.func import entrypoint, task
 from langgraph.graph import END, START, StateGraph
-from langgraph.graph.message import MessagesState, _messages_delta_reducer, add_messages
+from langgraph.graph.message import MessagesState, add_messages
 from langgraph.pregel import NodeBuilder, Pregel
-from langgraph.pregel._loop import AsyncPregelLoop, PregelLoop
+from langgraph.pregel._loop import AsyncPregelLoop
 from langgraph.pregel._runner import PregelRunner
-from langgraph.runtime import RunControl
 from langgraph.types import (
     CachePolicy,
     Command,
@@ -236,6 +222,7 @@ async def test_checkpoint_errors() -> None:
 async def test_request_drain_allows_inflight_acall_scheduling(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langgraph.runtime import RunControl
 
     @task
     async def child(x: int) -> int:
@@ -2881,6 +2868,7 @@ async def test_send_dedupe_on_resume(
 
 
 async def test_send_react_interrupt(async_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage, ToolCall, ToolMessage
 
     ai_message = AIMessage(
         "",
@@ -3271,6 +3259,7 @@ async def test_send_react_interrupt(async_checkpointer: BaseCheckpointSaver) ->
 async def test_send_react_interrupt_control(
     async_checkpointer: BaseCheckpointSaver, snapshot: SnapshotAssertion
 ) -> None:
+    from langchain_core.messages import AIMessage, HumanMessage, ToolCall, ToolMessage
 
     ai_message = AIMessage(
         "",
@@ -5549,6 +5538,12 @@ async def test_checkpoint_metadata(async_checkpointer: BaseCheckpointSaver) -> N
     previous checkpoint config for each step in the run.
     """
     # set up test
+    from langchain_core.language_models.fake_chat_models import (
+        FakeMessagesListChatModel,
+    )
+    from langchain_core.messages import AIMessage, AnyMessage
+    from langchain_core.prompts import ChatPromptTemplate
+    from langchain_core.tools import tool
 
     # graph state
     class BaseState(TypedDict):
@@ -5949,6 +5944,7 @@ async def test_debug_subgraphs(
 async def test_debug_nested_subgraphs(
     async_checkpointer: BaseCheckpointSaver, durability: Durability
 ) -> None:
+    from collections import defaultdict
 
     class State(TypedDict):
         messages: Annotated[list[str], operator.add]
@@ -6065,6 +6061,8 @@ async def test_debug_nested_subgraphs(
 async def test_parent_command(
     async_checkpointer: BaseCheckpointSaver, subgraph_persist: bool
 ) -> None:
+    from langchain_core.messages import BaseMessage
+    from langchain_core.tools import tool
 
     @tool(return_direct=True)
     def get_user_name() -> Command:
@@ -6132,6 +6130,10 @@ async def test_parent_command(
 
 async def test_delta_channel_durability_exit_stores_snapshot_async() -> None:
     """DeltaChannel must reload from an async durability='exit' checkpoint."""
+    from langchain_core.messages import AIMessage
+
+    from langgraph.channels.delta import DeltaChannel
+    from langgraph.graph.message import _messages_delta_reducer
 
     class State(TypedDict):
         messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
@@ -6418,6 +6420,7 @@ async def test_command_with_static_breakpoints(
 
 
 async def test_multistep_plan(async_checkpointer: BaseCheckpointSaver) -> None:
+    from langchain_core.messages import AnyMessage
 
     class State(TypedDict, total=False):
         plan: list[str | list[str]]
@@ -6755,6 +6758,7 @@ async def test_multiple_interrupts_functional(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None:
     """Test multiple interrupts with functional API."""
+    from langgraph.func import entrypoint, task
 
     counter = 0
 
@@ -7670,6 +7674,7 @@ async def test_configurable_propagates_to_stream_metadata() -> None:
 
 
 async def test_stream_mode_messages_command() -> None:
+    from langchain_core.messages import HumanMessage
 
     async def my_node(state):
         return {"messages": HumanMessage(content="foo")}
@@ -7718,6 +7723,7 @@ async def test_stream_mode_messages_command() -> None:
 
 
 async def test_stream_messages_dedupe_inputs() -> None:
+    from langchain_core.messages import AIMessage
 
     async def call_model(state):
         return {"messages": AIMessage("hi", id="1")}
@@ -7757,6 +7763,7 @@ async def test_stream_messages_dedupe_inputs() -> None:
 async def test_stream_messages_dedupe_state(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None:
+    from langchain_core.messages import AIMessage
 
     to_emit = [AIMessage("bye", id="1"), AIMessage("bye again", id="2")]
 
@@ -8135,6 +8142,9 @@ async def test_no_redundant_put_writes_for_cached_task(
     async_checkpointer: BaseCheckpointSaver,
 ) -> None:
     """Cached @tasks on resume must not trigger redundant put_writes."""
+    from unittest.mock import patch
+
+    from langgraph.pregel._loop import PregelLoop
 
     @task
     async def setup(x: int) -> int:
@@ -8636,6 +8646,7 @@ async def test_batch_update_as_input(
 
 
 async def test_draw_invalid():
+    from langchain_core.messages import BaseMessage
 
     class AgentState(TypedDict):
         messages: Annotated[list[BaseMessage], add_messages]

libs/langgraph/tests/test_pydantic.py

@@ -4,13 +4,10 @@ import ipaddress
 import pathlib
 import re
 import sys
-import typing
 import uuid
 from enum import Enum
 from typing import Annotated, Literal, Optional
 
-import pydantic
-import typing_extensions
 from langgraph.checkpoint.base import BaseCheckpointSaver
 from pydantic import (
     BaseModel,
@@ -35,6 +32,10 @@ from tests.any_str import AnyStr
 
 def test_is_supported_by_pydantic() -> None:
     """Test if types are supported by pydantic."""
+    import typing
+
+    import pydantic
+    import typing_extensions
 
     class TypedDictExtensions(typing_extensions.TypedDict):
         x: int

libs/langgraph/tests/test_remote_graph.py

@@ -10,14 +10,12 @@ from langchain_core.messages import AnyMessage, BaseMessage
 from langchain_core.runnables import RunnableConfig
 from langchain_core.runnables.graph import Edge as DrawableEdge
 from langchain_core.runnables.graph import Node as DrawableNode
-from langgraph.checkpoint.memory import InMemorySaver
-from langgraph_sdk.client import get_client, get_sync_client
 from langgraph_sdk.schema import StreamPart
 from pydantic import BaseModel
 from typing_extensions import TypedDict
 
 from langgraph.errors import GraphInterrupt
-from langgraph.graph import END, START, MessagesState, StateGraph, add_messages
+from langgraph.graph import StateGraph, add_messages
 from langgraph.pregel import Pregel
 from langgraph.pregel.remote import RemoteGraph
 from langgraph.types import Interrupt, StateSnapshot
@@ -1099,6 +1097,10 @@ def test_stream_context_base_model():
 )
 @pytest.mark.anyio
 async def test_langgraph_cloud_integration():
+    from langgraph.checkpoint.memory import InMemorySaver
+    from langgraph_sdk.client import get_client, get_sync_client
+
+    from langgraph.graph import END, START, MessagesState, StateGraph
 
     # create RemotePregel instance
     client = get_client(url="http://localhost:8123")

libs/langgraph/tests/test_remote_graph_v3.py

@@ -4,7 +4,6 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-from langgraph.pregel import remote as remote_mod
 from langgraph.pregel._remote_run_stream import (
     _AsyncRemoteGraphRunStream,
     _ChannelProjection,
@@ -578,6 +577,7 @@ def test_stream_events_v3_strips_checkpoint_keys_from_configurable():
 def test_stream_events_v3_merges_tracing_headers_when_distributed_tracing(
     monkeypatch,
 ):
+    from langgraph.pregel import remote as remote_mod
 
     sync_client = MagicMock()
     sync_client.threads.stream.return_value = MagicMock()

libs/langgraph/tests/test_retry.py

@@ -11,9 +11,7 @@ from typing import Annotated, Any
 from unittest.mock import Mock, patch
 from uuid import uuid4
 
-import httpx
 import pytest
-import requests
 from langchain_core.callbacks import AsyncCallbackManagerForLLMRun, BaseCallbackHandler
 from langchain_core.language_models.fake_chat_models import GenericFakeChatModel
 from langchain_core.messages import AIMessage, AIMessageChunk, BaseMessage, HumanMessage
@@ -65,7 +63,6 @@ from langgraph.types import (
     RetryPolicy,
     Send,
     TimeoutPolicy,
-    interrupt,
 )
 
 NEEDS_CONTEXTVARS = pytest.mark.skipif(
@@ -174,6 +171,8 @@ def test_checkpoint_ns_for_parent_command() -> None:
 
 def test_should_retry_default_retry_on():
     """Test the default retry_on function."""
+    import httpx
+    import requests
 
     # Create a RetryPolicy with default_retry_on
     policy = RetryPolicy()
@@ -2199,6 +2198,7 @@ def test_graph_error_handler_does_not_swallow_interrupt_concurrent():
     """When a graph error handler is configured and a node calls interrupt()
     concurrently with other nodes, the interrupt must still be raised — not
     silently swallowed."""
+    from langgraph.types import interrupt
 
     class State(TypedDict):
         foo: str
@@ -2587,6 +2587,8 @@ async def test_set_node_defaults_timeout():
         .compile()
     )
 
+    from langgraph.errors import NodeTimeoutError
+
     with pytest.raises(NodeTimeoutError):
         await graph.ainvoke({"foo": ""})
 

libs/langgraph/tests/test_runtime.py

@@ -6,11 +6,9 @@ from typing import Any
 
 import pytest
 from langgraph.checkpoint.memory import MemorySaver
-from langgraph.store.memory import InMemoryStore
 from pydantic import BaseModel, ValidationError
 from typing_extensions import TypedDict
 
-from langgraph._internal._constants import CONFIG_KEY_RUNTIME
 from langgraph.errors import GraphDrained
 from langgraph.graph import END, START, StateGraph
 from langgraph.runtime import (
@@ -1179,6 +1177,9 @@ def test_foreign_object_in_runtime_slot_is_coerced() -> None:
     `merge` when no per-run `context` is provided. `store` is resolved
     separately, so it is not read off the foreign object in the coercion.
     """
+    from langgraph.store.memory import InMemoryStore
+
+    from langgraph._internal._constants import CONFIG_KEY_RUNTIME
 
     store = InMemoryStore()
     graph_level_context = {"source": "graph-level"}

libs/langgraph/tests/test_serde_allowlist.py

@@ -79,7 +79,7 @@ class DummyChannel:
 
 def test_curated_core_allowlist_includes_messages() -> None:
     try:
-        from langchain_core.messages import BaseMessage  # noqa: PLC0415
+        from langchain_core.messages import BaseMessage
     except Exception:
         pytest.skip("langchain_core not available")
     allowlist = curated_core_allowlist()

libs/langgraph/tests/test_stream_data_transformers.py

@@ -13,10 +13,8 @@ import operator
 import time
 from typing import Annotated, Any
 
-from langgraph.checkpoint.memory import InMemorySaver
 from typing_extensions import TypedDict
 
-from langgraph.config import get_stream_writer
 from langgraph.constants import END, START
 from langgraph.graph import StateGraph
 from langgraph.stream._mux import StreamMux
@@ -490,6 +488,7 @@ class _State(TypedDict):
 
 
 def _my_node(state: _State) -> dict[str, Any]:
+    from langgraph.config import get_stream_writer
 
     writer = get_stream_writer()
     writer({"status": "working", "node": "my_node"})
@@ -607,6 +606,7 @@ def test_stream_events_v3_all_transformers_interleaved() -> None:
 
 def test_stream_events_v3_all_transformers_with_checkpointer() -> None:
     """All transformers with a checkpointer — run.checkpoints populated."""
+    from langgraph.checkpoint.memory import InMemorySaver
 
     builder = StateGraph(_State, input_schema=_State)
     builder.add_node("my_node", _my_node)
@@ -645,6 +645,7 @@ def test_stream_events_v3_all_transformers_with_checkpointer() -> None:
 
 def test_stream_events_v3_checkpoints_projection_opt_in() -> None:
     """run.checkpoints surfaces checkpoint data when opted in with a checkpointer."""
+    from langgraph.checkpoint.memory import InMemorySaver
 
     builder = StateGraph(_State, input_schema=_State)
     builder.add_node("my_node", _my_node)

libs/langgraph/tests/test_stream_messages_transformer.py

@@ -3,10 +3,8 @@ legacy v1 chunk filtering, and end-to-end via stream_events(version="v3") / astr
 
 from __future__ import annotations
 
-import asyncio
 import time
 from typing import Any
-from uuid import uuid4
 
 import pytest
 from langchain_core.language_models import GenericFakeChatModel
@@ -15,13 +13,11 @@ from langchain_core.language_models.chat_model_stream import (
     ChatModelStream,
 )
 from langchain_core.messages import AIMessage, AIMessageChunk, ToolMessage
-from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, LLMResult
 from langchain_core.runnables import RunnableConfig
 from typing_extensions import TypedDict
 
 from langgraph.constants import END, START
 from langgraph.graph import MessagesState, StateGraph
-from langgraph.pregel._messages import StreamMessagesHandlerV2
 from langgraph.stream._mux import StreamMux
 from langgraph.stream.run_stream import GraphRunStream
 from langgraph.stream.stream_channel import StreamChannel
@@ -611,6 +607,7 @@ class TestEndToEnd:
     @pytest.mark.anyio
     async def test_nested_async_iteration_yields_text_deltas(self) -> None:
         """Inner stream.text drives the shared graph pump via the async pump binding."""
+        import asyncio
 
         model = GenericFakeChatModel(messages=iter(["hello world"]))
 
@@ -873,6 +870,11 @@ class TestDirectMessagesModeStaysV1:
 class TestStreamMessagesHandlerV2Unit:
     def test_on_llm_new_token_is_noop(self) -> None:
         """v2 handler must not emit v1 chunks even when on_llm_new_token fires."""
+        from uuid import uuid4
+
+        from langchain_core.outputs import ChatGenerationChunk
+
+        from langgraph.pregel._messages import StreamMessagesHandlerV2
 
         emitted: list[Any] = []
         handler = StreamMessagesHandlerV2(emitted.append, subgraphs=False)
@@ -888,6 +890,9 @@ class TestStreamMessagesHandlerV2Unit:
         assert emitted == []
 
     def test_on_chain_end_does_not_emit_tool_messages(self) -> None:
+        from uuid import uuid4
+
+        from langgraph.pregel._messages import StreamMessagesHandlerV2
 
         emitted: list[Any] = []
         handler = StreamMessagesHandlerV2(emitted.append, subgraphs=False)
@@ -904,6 +909,11 @@ class TestStreamMessagesHandlerV2Unit:
     def test_on_llm_end_dedupes_when_final_message_id_differs(self) -> None:
         """A streamed v2 message should not be emitted again from the final
         AIMessage fallback when its final id does not match `message-start`."""
+        from uuid import uuid4
+
+        from langchain_core.outputs import ChatGeneration, LLMResult
+
+        from langgraph.pregel._messages import StreamMessagesHandlerV2
 
         emitted: list[Any] = []
         handler = StreamMessagesHandlerV2(emitted.append, subgraphs=False)

libs/langgraph/tests/test_subgraph_detection.py

@@ -1,286 +0,0 @@
-"""Tests for subgraph auto-detection (`pregel/_utils.py`).
-
-Detection failing is silent — the graph still runs, only introspection goes
-quiet — so every shape a node can hold a graph in is pinned here. The expected
-values are what the source-parsing implementation this replaced produced for
-the same shapes, except for `sourceless`, whose source it could not read,
-`empty_closure_cell`, on which it raised, and `unreachable_attribute_chain`,
-where it reported a graph that dropped code could never invoke.
-"""
-
-import functools
-import operator
-from typing import Annotated, Any
-
-import pytest
-from typing_extensions import TypedDict
-
-from langgraph.graph import END, START, StateGraph
-from langgraph.pregel._utils import get_function_nonlocals
-
-
-class State(TypedDict):
-    log: Annotated[list, operator.add]
-
-
-def _leaf(tag: str) -> Any:
-    """Return a compiled graph that reports itself as `tag`."""
-    builder = StateGraph(State)
-    builder.add_node(tag, lambda s: {"log": [tag]})
-    builder.add_edge(START, tag)
-    builder.add_edge(tag, END)
-    compiled = builder.compile()
-    compiled.name = tag
-    return compiled
-
-
-def _detect(node: Any) -> str | None:
-    """Return the name of the subgraph detected for `node`, or None."""
-    builder = StateGraph(State)
-    builder.add_node("n", node)
-    builder.add_edge(START, "n")
-    builder.add_edge("n", END)
-    subgraphs = builder.compile().nodes["n"].subgraphs
-    return getattr(subgraphs[0], "name", "?") if subgraphs else None
-
-
-class _Box:
-    def __init__(self, payload: Any) -> None:
-        self.payload = payload
-
-
-class _ListSubclass(list):
-    pass
-
-
-class _MethodHolder:
-    def __init__(self) -> None:
-        self.graph = _leaf("via_self")
-
-    def as_node(self, state: State) -> Any:
-        return self.graph.invoke(state)
-
-
-MODULE_GRAPH = _leaf("module_global")
-CHAIN = _Box(_Box(_leaf("attr_chain")))
-GRAPH_IN_PLAIN_LIST = [_leaf("in_list")]
-METHOD_HOLDER = _MethodHolder()
-
-
-def closure_capture() -> Any:
-    sub = _leaf("closure")
-
-    def node(state: State) -> Any:
-        return sub.invoke(state)
-
-    return node
-
-
-def module_global() -> Any:
-    def node(state: State) -> Any:
-        return MODULE_GRAPH.invoke(state)
-
-    return node
-
-
-def attribute_chain() -> Any:
-    def node(state: State) -> Any:
-        return CHAIN.payload.payload.invoke(state)
-
-    return node
-
-
-def nested_def_captured_attribute() -> Any:
-    """A chain on a captured holder, named only inside a nested code object.
-
-    The captured value is the holder, not the graph, so the chain itself has to
-    be recovered from the nested scope.
-    """
-    holder = _Box(_leaf("nested_captured"))
-
-    def node(state: State) -> Any:
-        def inner() -> Any:
-            return holder.payload.invoke(state)
-
-        return inner()
-
-    return node
-
-
-def unreachable_branch() -> Any:
-    """A captured graph referenced only from code the compiler removes."""
-    sub = _leaf("unreachable")
-
-    def node(state: State) -> Any:
-        if False:
-            sub.invoke(state)
-        return {"log": []}
-
-    return node
-
-
-def unreachable_attribute_chain() -> Any:
-    """A graph named only along an attribute path the compiler dropped.
-
-    The closure keeps `holder`, but the `.payload` load is gone. The source
-    parser reported this one; dropped code cannot invoke anything, so that was
-    a phantom rather than a detection.
-    """
-    holder = _Box(_leaf("unreachable_attr"))
-
-    def node(state: State) -> Any:
-        if False:
-            holder.payload.invoke(state)
-        return {"log": []}
-
-    return node
-
-
-def wrapper_referencing_nothing() -> Any:
-    """A wrapper whose own scope holds nothing, so only `__wrapped__` leads on.
-
-    `functools.wraps` would leave the wrapper closing over the inner function;
-    setting the attribute by hand does not.
-    """
-    sub = _leaf("via_wrapped")
-
-    def inner(state: State) -> Any:
-        return sub.invoke(state)
-
-    def wrapper(state: State) -> Any:
-        return {"log": []}
-
-    wrapper.__wrapped__ = inner
-    return wrapper
-
-
-def captured_list_subclass() -> Any:
-    """A `list` subclass is not a leaf: it can carry a graph as an attribute."""
-    holder = _ListSubclass()
-    holder.payload = _leaf("list_subclass")
-
-    def node(state: State) -> Any:
-        return holder.payload.invoke(state)
-
-    return node
-
-
-def empty_closure_cell() -> Any:
-    """An unassigned closure variable leaves a cell that cannot be read."""
-    sub = _leaf("beside_empty_cell")
-
-    def node(state: State) -> Any:
-        return unassigned, sub.invoke(state)
-
-    return node
-    unassigned = 1  # never runs, so the cell it creates is never filled
-
-
-def sourceless() -> Any:
-    """A node compiled without a source file, which `getsource` could not read."""
-    namespace: dict[str, Any] = {"SOURCELESS": _leaf("sourceless")}
-    exec(
-        compile(
-            "def node(state):\n    return SOURCELESS.invoke(state)", "<test>", "exec"
-        ),
-        namespace,
-    )
-    return namespace["node"]
-
-
-async def _async_node(state: State) -> Any:
-    return await MODULE_GRAPH.ainvoke(state)
-
-
-def async_node() -> Any:
-    return _async_node
-
-
-def no_subgraph() -> Any:
-    """Nothing but leaf values in reach, so the bytecode walk is skipped."""
-
-    def node(state: State) -> Any:
-        return {"log": [len("abc") + 1]}
-
-    return node
-
-
-def recombined_names() -> Any:
-    """Loads `CHAIN.payload` and `local.payload`, never `CHAIN.payload.payload`."""
-
-    def node(state: State) -> Any:
-        local = _Box("not a graph")
-        return {"log": [CHAIN.payload, local.payload]}
-
-    return node
-
-
-def broken_attribute_chain() -> Any:
-    holder = _Box("a string, so `.payload.missing` cannot resolve")
-
-    def node(state: State) -> Any:
-        return holder.payload.missing.invoke(state)
-
-    return node
-
-
-def nested_def_global() -> Any:
-    """A global named only in a nested code object: out of reach, as before."""
-
-    def node(state: State) -> Any:
-        def inner() -> Any:
-            return MODULE_GRAPH.invoke(state)
-
-        return inner()
-
-    return node
-
-
-def graph_in_plain_list() -> Any:
-    def node(state: State) -> Any:
-        return GRAPH_IN_PLAIN_LIST[0].invoke(state)
-
-    return node
-
-
-def bound_method_self() -> Any:
-    return METHOD_HOLDER.as_node
-
-
-@pytest.mark.parametrize(
-    ("factory", "expected"),
-    [
-        (closure_capture, "closure"),
-        (module_global, "module_global"),
-        (attribute_chain, "attr_chain"),
-        (nested_def_captured_attribute, "nested_captured"),
-        (unreachable_branch, "unreachable"),
-        (wrapper_referencing_nothing, "via_wrapped"),
-        (captured_list_subclass, "list_subclass"),
-        (empty_closure_cell, "beside_empty_cell"),
-        (sourceless, "sourceless"),
-        (async_node, "module_global"),
-        # Shapes no reference chain reaches: a subscript, an instance attribute
-        # of `self`, a global named only in a nested scope, and an attribute
-        # path the compiler dropped.
-        (no_subgraph, None),
-        (recombined_names, None),
-        (broken_attribute_chain, None),
-        (nested_def_global, None),
-        (graph_in_plain_list, None),
-        (bound_method_self, None),
-        (unreachable_attribute_chain, None),
-    ],
-    ids=lambda value: value.__name__ if callable(value) else str(value),
-)
-def test_subgraph_detection(factory: Any, expected: str | None) -> None:
-    assert _detect(factory()) == expected
-
-
-@pytest.mark.parametrize(
-    "candidate",
-    [functools.partial(lambda state, extra: {"log": [extra]}, extra="x"), len],
-    ids=["partial", "builtin"],
-)
-def test_callables_without_a_code_object_are_handled(candidate: Any) -> None:
-    assert get_function_nonlocals(candidate) == []

libs/langgraph/tests/test_trace_policy.py

@@ -1,149 +0,0 @@
-"""End-to-end tests for `TracePolicy` input processing on node trace runs."""
-
-from typing import Any
-
-import pytest
-from typing_extensions import TypedDict
-
-from langgraph.graph import END, START, StateGraph
-from langgraph.types import TracePolicy
-from tests.fake_tracer import FakeTracer, Run
-
-
-class State(TypedDict):
-    value: int
-
-
-def _node_run(tracer: FakeTracer, name: str) -> Run:
-    return next(r for r in tracer.flattened_runs() if r.name == name)
-
-
-def _incr(state: State) -> State:
-    return {"value": state["value"] + 1}
-
-
-def test_trace_policy_transforms_recorded_inputs() -> None:
-    seen: dict[str, Any] = {}
-
-    def process_inputs(inp: Any) -> Any:
-        seen["inputs"] = inp
-        return {"scrubbed_in": True}
-
-    graph = (
-        StateGraph(State)
-        .add_node("n", _incr, trace_policy=TracePolicy(process_inputs=process_inputs))
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    tracer = FakeTracer()
-    # the real graph output is unaffected by the trace policy
-    assert graph.invoke({"value": 1}, {"callbacks": [tracer]}) == {"value": 2}
-
-    run = _node_run(tracer, "n")
-    # the recorded input is transformed; the output is recorded as-is
-    assert run.inputs == {"scrubbed_in": True}
-    assert run.outputs == {"value": 2}
-    # process_inputs observed the real, untransformed input
-    assert seen["inputs"] == {"value": 1}
-
-
-def test_trace_policy_transforms_recorded_outputs() -> None:
-    seen: dict[str, Any] = {}
-
-    def process_outputs(out: Any) -> Any:
-        seen["outputs"] = out
-        return {"scrubbed_out": True}
-
-    graph = (
-        StateGraph(State)
-        .add_node("n", _incr, trace_policy=TracePolicy(process_outputs=process_outputs))
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    tracer = FakeTracer()
-    # the real graph output is unaffected by the trace policy
-    assert graph.invoke({"value": 1}, {"callbacks": [tracer]}) == {"value": 2}
-
-    run = _node_run(tracer, "n")
-    # the recorded output is transformed; the input is recorded as-is
-    assert run.inputs == {"value": 1}
-    assert run.outputs == {"scrubbed_out": True}
-    # process_outputs observed the real, untransformed output
-    assert seen["outputs"] == {"value": 2}
-
-
-def test_trace_policy_none_records_real_payloads() -> None:
-    graph = (
-        StateGraph(State)
-        .add_node("n", _incr)
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    tracer = FakeTracer()
-    assert graph.invoke({"value": 1}, {"callbacks": [tracer]}) == {"value": 2}
-
-    run = _node_run(tracer, "n")
-    assert run.inputs == {"value": 1}
-    assert run.outputs == {"value": 2}
-
-
-def test_trace_policy_processor_error_safe_without_callbacks() -> None:
-    def boom(_inp: Any) -> Any:
-        raise RuntimeError("processor failed")
-
-    graph = (
-        StateGraph(State)
-        .add_node("n", _incr, trace_policy=TracePolicy(process_inputs=boom))
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    # no callbacks: the processor still runs but is fail-open, so execution is unaffected
-    assert graph.invoke({"value": 1}) == {"value": 2}
-
-
-def test_trace_policy_processor_error_does_not_break_execution() -> None:
-    def boom(_inp: Any) -> Any:
-        raise RuntimeError("processor failed")
-
-    graph = (
-        StateGraph(State)
-        .add_node("n", _incr, trace_policy=TracePolicy(process_inputs=boom))
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    tracer = FakeTracer()
-    # a raising processor must not abort the node; the untransformed input is recorded
-    assert graph.invoke({"value": 1}, {"callbacks": [tracer]}) == {"value": 2}
-    assert _node_run(tracer, "n").inputs == {"value": 1}
-
-
-@pytest.mark.anyio
-async def test_trace_policy_transforms_recorded_inputs_async() -> None:
-    graph = (
-        StateGraph(State)
-        .add_node(
-            "n",
-            _incr,
-            trace_policy=TracePolicy(process_inputs=lambda _: {"scrubbed_in": True}),
-        )
-        .add_edge(START, "n")
-        .add_edge("n", END)
-        .compile()
-    )
-
-    tracer = FakeTracer()
-    assert await graph.ainvoke({"value": 5}, {"callbacks": [tracer]}) == {"value": 6}
-
-    run = _node_run(tracer, "n")
-    assert run.inputs == {"scrubbed_in": True}
-    assert run.outputs == {"value": 6}

libs/langgraph/tests/test_utils.py

@@ -2,7 +2,6 @@ import functools
 import sys
 import uuid
 from collections.abc import Callable
-from dataclasses import dataclass
 from typing import (
     Annotated,
     Any,
@@ -18,10 +17,7 @@ import langsmith
 import pytest
 from langchain_core.callbacks import BaseCallbackHandler, CallbackManager
 from langchain_core.runnables import RunnableConfig
-from langchain_core.runnables.config import var_child_runnable_config
 from langchain_core.tracers import LangChainTracer
-from langsmith import get_current_run_tree  # type: ignore
-from pydantic import BaseModel, Field
 from typing_extensions import NotRequired, Required, TypedDict
 
 from langgraph._internal._config import (
@@ -122,6 +118,7 @@ def rt_graph() -> CompiledStateGraph:
         node_run_id: int
 
     def node(_: State):
+        from langsmith import get_current_run_tree  # type: ignore
 
         return {"node_run_id": get_current_run_tree().id}  # type: ignore
 
@@ -246,6 +243,10 @@ def test_is_required():
 
 
 def test_enhanced_type_hints() -> None:
+    from dataclasses import dataclass
+    from typing import Annotated
+
+    from pydantic import BaseModel, Field
 
     class MyTypedDict(TypedDict):
         val_1: str
@@ -509,6 +510,7 @@ def test_ensure_config_explicit_configurable_replaces_ambient() -> None:
     # An explicit checkpoint coordinate (here a new thread_id) starts a fresh
     # lineage and drops the ambient run context (e.g. a parent task's
     # checkpoint_ns), so a child graph does not inherit it.
+    from langchain_core.runnables.config import var_child_runnable_config
 
     token = var_child_runnable_config.set(
         {"configurable": {"checkpoint_ns": "p:parent-task", "checkpoint_id": "cid"}}
@@ -525,6 +527,7 @@ def test_ensure_config_explicit_configurable_replaces_ambient() -> None:
 def test_ensure_config_ambient_inherited_when_no_explicit_configurable() -> None:
     # With no explicit configurable, the ambient run context is inherited
     # unchanged (stateless subgraph / interrupt-resume pattern).
+    from langchain_core.runnables.config import var_child_runnable_config
 
     token = var_child_runnable_config.set(
         {"configurable": {"checkpoint_ns": "p:parent-task"}}
@@ -540,6 +543,7 @@ def test_ensure_config_explicit_configurables_still_merge_over_ambient() -> None
     # A new thread_id drops the ambient, but explicit configs still shallow-merge
     # among themselves, so a with_config(...) value (ls_agent_type) survives
     # alongside an invoke-time thread_id.
+    from langchain_core.runnables.config import var_child_runnable_config
 
     token = var_child_runnable_config.set(
         {"configurable": {"checkpoint_ns": "p:parent-task"}}
@@ -560,6 +564,7 @@ def test_ensure_config_non_coordinate_config_keeps_ambient_checkpoint_ns() -> No
     # A nested subagent is invoked with a non-coordinate configurable key
     # (ls_agent_type) and no thread_id; it must keep the inherited checkpoint_ns
     # so it stays a discoverable child of the parent run (deepagents `task` tool).
+    from langchain_core.runnables.config import var_child_runnable_config
 
     token = var_child_runnable_config.set(
         {"configurable": {"thread_id": "parent", "checkpoint_ns": "p:parent-task"}}
@@ -577,6 +582,7 @@ def test_ensure_config_same_thread_id_still_clears_ambient() -> None:
     # A child that reuses the parent's thread_id is still addressing its own root
     # namespace on that thread, so the parent task's checkpoint_ns must not leak
     # in; otherwise the child writes state that get_state cannot read back.
+    from langchain_core.runnables.config import var_child_runnable_config
 
     token = var_child_runnable_config.set(
         {"configurable": {"thread_id": "shared", "checkpoint_ns": "p:parent-task"}}

libs/langgraph/uv.lock

@@ -28,16 +28,16 @@ wheels = [
 
 [[package]]
 name = "anyio"
-version = "4.14.2"
+version = "4.14.1"
 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'" },
 ]
-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/3b/72/5562aabb8dd7181e8e860622a38bea08d17842b99ecd4c91f84ac95251b0/anyio-4.14.1.tar.gz", hash = "sha256:8d648a3544c1a700e3ff78615cd679e4c5c3f149904287e73687b2596963629e", size = 254831, upload-time = "2026-06-24T20:56:06.017Z" }
 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/b0/7b/90df4a0a816d98d6ea26f559d87836d494a2cf1fcf063be67df50a7bcc30/anyio-4.14.1-py3-none-any.whl", hash = "sha256:4e5533c5b8ff0a24f5d7a176cbe6877129cd183893f66b537f8f227d10527d72", size = 124875, upload-time = "2026-06-24T20:56:04.413Z" },
 ]
 
 [[package]]
@@ -193,7 +193,7 @@ name = "blockbuster"
 version = "1.5.26"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "forbiddenfruit", marker = "python_full_version >= '3.11' and python_full_version < '3.14' and implementation_name == 'cpython'" },
+    { name = "forbiddenfruit", marker = "implementation_name == 'cpython'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/55/e0/dcbab602790a576b0b94108c07e2c048e5897df7cc83722a89582d733987/blockbuster-1.5.26.tar.gz", hash = "sha256:cc3ce8c70fa852a97ee3411155f31e4ad2665cd1c6c7d2f8bb1851dab61dc629", size = 36085, upload-time = "2025-12-05T10:43:47.735Z" }
 wheels = [
@@ -385,7 +385,7 @@ name = "click"
 version = "8.4.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "colorama", marker = "python_full_version < '3.14' and sys_platform == 'win32'" },
+    { name = "colorama", marker = "sys_platform == 'win32'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/76/d4/81420972a676e8ffea40450d8c8c92943e7218a78fe9b64359836cc9876b/click-8.4.2.tar.gz", hash = "sha256:9a6cea6e60b17ebe0a44c5cc636d94f09bd66142c1cd7d8b4cd731c4917a15f6", size = 338000, upload-time = "2026-06-24T17:45:15.148Z" }
 wheels = [
@@ -528,7 +528,7 @@ name = "croniter"
 version = "6.2.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "python-dateutil", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "python-dateutil" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/df/de/5832661ed55107b8a09af3f0a2e71e0957226a59eb1dcf0a445cce6daf20/croniter-6.2.2.tar.gz", hash = "sha256:ba60832a5ec8e12e51b8691c3309a113d1cf6526bdf1a48150ce8ec7a532d0ab", size = 113762, upload-time = "2026-03-15T08:43:48.112Z" }
 wheels = [
@@ -540,7 +540,7 @@ name = "cryptography"
 version = "50.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "cffi", marker = "python_full_version >= '3.11' and python_full_version < '3.14' and platform_python_implementation != 'PyPy'" },
+    { name = "cffi", marker = "platform_python_implementation != 'PyPy'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/de/41/6cbdcf9142d00fe82836fbb51e503e58088575cf7a0fe1dbff6695bf0840/cryptography-50.0.0.tar.gz", hash = "sha256:eeac2acb5a20ed25e0ad6d1df9891a520b78b404266b6d11778f25d5d691a6c9", size = 880201, upload-time = "2026-07-31T14:25:10.11Z" }
 wheels = [
@@ -643,7 +643,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -697,7 +697,7 @@ name = "googleapis-common-protos"
 version = "1.72.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "protobuf", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "protobuf" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/e5/7b/adfd75544c415c487b33061fe7ae526165241c1ea133f9a9125a56b39fd8/googleapis_common_protos-1.72.0.tar.gz", hash = "sha256:e55a601c1b32b52d7a3e65f43563e2aa61bcd737998ee672ac9b951cd49319f5", size = 147433, upload-time = "2025-11-06T18:29:24.087Z" }
 wheels = [
@@ -709,7 +709,7 @@ name = "grpcio"
 version = "1.80.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/b7/48/af6173dbca4454f4637a4678b67f52ca7e0c1ed7d5894d89d434fecede05/grpcio-1.80.0.tar.gz", hash = "sha256:29aca15edd0688c22ba01d7cc01cb000d72b2033f4a3c72a81a19b56fd143257", size = 12978905, upload-time = "2026-03-30T08:49:10.502Z" }
 wheels = [
@@ -770,8 +770,8 @@ name = "grpcio-health-checking"
 version = "1.80.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "grpcio", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
-    { name = "protobuf", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "grpcio" },
+    { name = "protobuf" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/d1/a2/aa3cc47f19c03f8e5287b987317059753141a3af8f66b96d5a64b3be10b8/grpcio_health_checking-1.80.0.tar.gz", hash = "sha256:2cc5f08bc8b816b8655ab6f59c71450063ba20766d31e21a493e912e3560c8b1", size = 17117, upload-time = "2026-03-30T08:54:41.899Z" }
 wheels = [
@@ -783,9 +783,9 @@ name = "grpcio-tools"
 version = "1.80.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "grpcio", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
-    { name = "protobuf", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
-    { name = "setuptools", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "grpcio" },
+    { name = "protobuf" },
+    { name = "setuptools" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/94/c8/1223f29c84a143ae9a56c084fc96894de0ba84b6e8d60a26241abd81d278/grpcio_tools-1.80.0.tar.gz", hash = "sha256:26052b19c6ce0dcf52d1024496aea3e2bdfa864159f06dc7b97b22d041a94b26", size = 6133212, upload-time = "2026-03-30T08:52:39.077Z" }
 wheels = [
@@ -936,7 +936,7 @@ name = "importlib-metadata"
 version = "8.7.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "zipp", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "zipp" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/f3/49/3b30cad09e7771a4982d9975a8cbf64f00d4a1ececb53297f1d9a7be1b10/importlib_metadata-8.7.1.tar.gz", hash = "sha256:49fef1ae6440c182052f407c8d34a68f72efc36db9ca90dc0113398f2fdde8bb", size = 57107, upload-time = "2025-12-21T10:00:19.278Z" }
 wheels = [
@@ -985,17 +985,17 @@ resolution-markers = [
     "python_full_version < '3.11'",
 ]
 dependencies = [
-    { name = "colorama", marker = "python_full_version < '3.11' and sys_platform == 'win32'" },
-    { name = "decorator", marker = "python_full_version < '3.11'" },
-    { name = "exceptiongroup", marker = "python_full_version < '3.11'" },
-    { name = "jedi", marker = "python_full_version < '3.11'" },
-    { name = "matplotlib-inline", marker = "python_full_version < '3.11'" },
-    { name = "pexpect", marker = "python_full_version < '3.11' and sys_platform != 'emscripten' and sys_platform != 'win32'" },
-    { name = "prompt-toolkit", marker = "python_full_version < '3.11'" },
-    { name = "pygments", marker = "python_full_version < '3.11'" },
-    { name = "stack-data", marker = "python_full_version < '3.11'" },
-    { name = "traitlets", marker = "python_full_version < '3.11'" },
-    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "decorator" },
+    { name = "exceptiongroup" },
+    { name = "jedi" },
+    { name = "matplotlib-inline" },
+    { name = "pexpect", marker = "sys_platform != 'emscripten' and sys_platform != 'win32'" },
+    { name = "prompt-toolkit" },
+    { name = "pygments" },
+    { name = "stack-data" },
+    { name = "traitlets" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/e5/61/1810830e8b93c72dcd3c0f150c80a00c3deb229562d9423807ec92c3a539/ipython-8.38.0.tar.gz", hash = "sha256:9cfea8c903ce0867cc2f23199ed8545eb741f3a69420bfcf3743ad1cec856d39", size = 5513996, upload-time = "2026-01-05T10:59:06.901Z" }
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@@ -1012,17 +1012,17 @@ resolution-markers = [
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 ]
 dependencies = [
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-    { name = "decorator", marker = "python_full_version >= '3.11'" },
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-    { name = "jedi", marker = "python_full_version >= '3.11'" },
-    { name = "matplotlib-inline", marker = "python_full_version >= '3.11'" },
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-    { name = "prompt-toolkit", marker = "python_full_version >= '3.11'" },
-    { name = "pygments", marker = "python_full_version >= '3.11'" },
-    { name = "stack-data", marker = "python_full_version >= '3.11'" },
-    { name = "traitlets", marker = "python_full_version >= '3.11'" },
-    { name = "typing-extensions", marker = "python_full_version == '3.11.*'" },
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "decorator" },
+    { name = "ipython-pygments-lexers" },
+    { name = "jedi" },
+    { name = "matplotlib-inline" },
+    { name = "pexpect", marker = "sys_platform != 'emscripten' and sys_platform != 'win32'" },
+    { name = "prompt-toolkit" },
+    { name = "pygments" },
+    { name = "stack-data" },
+    { name = "traitlets" },
+    { name = "typing-extensions", marker = "python_full_version < '3.12'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/46/dd/fb08d22ec0c27e73c8bc8f71810709870d51cadaf27b7ddd3f011236c100/ipython-9.9.0.tar.gz", hash = "sha256:48fbed1b2de5e2c7177eefa144aba7fcb82dac514f09b57e2ac9da34ddb54220", size = 4425043, upload-time = "2026-01-05T12:36:46.233Z" }
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@@ -1034,7 +1034,7 @@ name = "ipython-pygments-lexers"
 version = "1.1.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "pygments", marker = "python_full_version >= '3.11'" },
+    { name = "pygments" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/ef/4c/5dd1d8af08107f88c7f741ead7a40854b8ac24ddf9ae850afbcf698aa552/ipython_pygments_lexers-1.1.1.tar.gz", hash = "sha256:09c0138009e56b6854f9535736f4171d855c8c08a563a0dcd8022f78355c7e81", size = 8393, upload-time = "2025-01-17T11:24:34.505Z" }
 wheels = [
@@ -1404,7 +1404,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.5.3"
+version = "1.4.8"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -1417,9 +1417,9 @@ dependencies = [
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     { name = "uuid-utils" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/12/e3/bea6d0080acf183332f24dcd74c208aee5857cf8f783c3fb0bd86027d8fb/langchain_core-1.4.8.tar.gz", hash = "sha256:5bf1f8411077c904182ad8f975943d36adcbf579c4e017b3a118b719229ebf9a", size = 957974, upload-time = "2026-06-18T19:39:23.636Z" }
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+    { url = "https://files.pythonhosted.org/packages/13/d6/bdf6f0481cc57ef300d6b1eb48cf1400c0409be715d6eb3cabadd1142a09/langchain_core-1.4.8-py3-none-any.whl", hash = "sha256:d84c28b05e3ba8d4271d0827aad5b592ccdaaf986e76768c23503f0a2045e8aa", size = 557416, upload-time = "2026-06-18T19:39:21.902Z" },
 ]
 
 [[package]]
@@ -1436,7 +1436,7 @@ wheels = [
 
 [[package]]
 name = "langgraph"
-version = "1.2.11"
+version = "1.2.10"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -1582,38 +1582,38 @@ name = "langgraph-api"
 version = "0.10.0"
 source = { registry = "https://pypi.org/simple" }
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+    { name = "grpcio-health-checking" },
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+    { name = "langchain-protocol" },
+    { name = "langgraph" },
+    { name = "langgraph-checkpoint" },
+    { name = "langgraph-runtime-inmem" },
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+    { name = "langsmith", extra = ["otel"] },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
+    { name = "opentelemetry-sdk" },
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+    { name = "starlette" },
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@@ -1622,7 +1622,7 @@ wheels = [
 
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@@ -1670,7 +1670,7 @@ test = [
 
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@@ -1709,7 +1708,6 @@ lint = [
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-    { name = "httpx", marker = "python_full_version < '3.14'" },
+    { name = "click" },
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-    { name = "tomli", marker = "python_full_version < '3.11'" },
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+    { name = "blockbuster" },
+    { name = "croniter" },
+    { name = "langgraph" },
+    { name = "langgraph-checkpoint" },
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-    { name = "opentelemetry-sdk", marker = "python_full_version >= '3.11' and python_full_version < '3.14'" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-http" },
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+    { name = "googleapis-common-protos" },
+    { name = "opentelemetry-api" },
+    { name = "opentelemetry-exporter-otlp-proto-common" },
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 ]
 
 [[package]]

libs/prebuilt/README.md

@@ -37,7 +37,6 @@ uv add langchain-anthropic
 from langchain_anthropic import ChatAnthropic
 from langgraph.prebuilt import create_react_agent
 
-
 # Define the tools for the agent to use
 def search(query: str):
     """Call to surf the web."""
@@ -46,7 +45,6 @@ def search(query: str):
         return "It's 60 degrees and foggy."
     return "It's 90 degrees and sunny."
 
-
 tools = [search]
 model = ChatAnthropic(model="claude-3-7-sonnet-latest")
 
@@ -67,7 +65,6 @@ app.invoke(
 from langgraph.prebuilt import ToolNode
 from langchain_core.messages import AIMessage
 
-
 def search(query: str):
     """Call to surf the web."""
     # This is a placeholder, but don't tell the LLM that...
@@ -75,11 +72,8 @@ def search(query: str):
         return "It's 60 degrees and foggy."
     return "It's 90 degrees and sunny."
 
-
 tool_node = ToolNode([search])
-tool_calls = [
-    {"name": "search", "args": {"query": "what is the weather in sf"}, "id": "1"}
-]
+tool_calls = [{"name": "search", "args": {"query": "what is the weather in sf"}, "id": "1"}]
 ai_message = AIMessage(content="", tool_calls=tool_calls)
 # execute tool call
 tool_node.invoke({"messages": [ai_message]})
@@ -104,17 +98,10 @@ class SelectNumber(BaseModel):
             raise ValueError("Only 37 is allowed")
         return v
 
-
 validation_node = ValidationNode([SelectNumber])
-validation_node.invoke(
-    {
-        "messages": [
-            AIMessage(
-                "", tool_calls=[{"name": "SelectNumber", "args": {"a": 42}, "id": "1"}]
-            )
-        ]
-    }
-)
+validation_node.invoke({
+    "messages": [AIMessage("", tool_calls=[{"name": "SelectNumber", "args": {"a": 42}, "id": "1"}])]
+})
 ```
 
 ## Agent Inbox

libs/prebuilt/langgraph/prebuilt/tool_node.py

@@ -87,8 +87,8 @@ from langgraph._internal._runnable import RunnableCallable
 from langgraph.errors import GraphBubbleUp
 from langgraph.graph.message import REMOVE_ALL_MESSAGES
 from langgraph.pregel._tools import _tool_call_writer
-from langgraph.runtime import ExecutionInfo, ServerInfo
-from langgraph.store.base import BaseStore
+from langgraph.runtime import ExecutionInfo, ServerInfo  # noqa: TC002
+from langgraph.store.base import BaseStore  # noqa: TC002
 from langgraph.types import Command, Send, StreamWriter
 from pydantic import BaseModel, ValidationError
 from typing_extensions import TypeVar, Unpack
@@ -332,7 +332,7 @@ def msg_content_output(output: Any) -> str | list[dict]:
     # any existing ToolNode usage.
     try:
         return json.dumps(output, ensure_ascii=False)
-    except Exception:
+    except Exception:  # noqa: BLE001
         return str(output)
 
 
@@ -736,7 +736,7 @@ class ToolNode(RunnableCallable):
 
         tool_node = ToolNode([my_tool], handle_tool_errors=handle_errors)
         ```
-    """
+    """  # noqa: E501
 
     name: str = "tools"
 

libs/prebuilt/pyproject.toml

@@ -75,12 +75,8 @@ addopts = "--strict-markers --strict-config --durations=5 -vv"
 asyncio_mode = "auto"
 
 [tool.ruff]
-lint.select = [ "E", "F", "I", "PLC0415", "RUF100", "TID251", "UP" ]
+lint.select = [ "E", "F", "I", "TID251", "UP" ]
 lint.ignore = [ "E501" ]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"
 
 [tool.ty.rules]

libs/prebuilt/tests/memory_assert.py

@@ -1,6 +1,5 @@
 import os
 import tempfile
-import time
 from collections import defaultdict
 from functools import partial
 
@@ -39,6 +38,8 @@ class MemorySaverAssertImmutable(InMemorySaver):
         new_versions: ChannelVersions,
     ) -> None:
         if self.put_sleep:
+            import time
+
             time.sleep(self.put_sleep)
         # assert checkpoint hasn't been modified since last written
         thread_id = config["configurable"]["thread_id"]

libs/prebuilt/tests/test_injected_state_not_required.py

@@ -9,19 +9,16 @@ handle missing fields by injecting None instead of raising KeyError.
 
 import sys
 from typing import Annotated
-from unittest.mock import Mock
 
 import pytest
 from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, ToolMessage
 from langchain_core.tools import tool
 from langgraph.graph.message import add_messages
-from langgraph.runtime import Runtime
 from pydantic import BaseModel, Field
 from typing_extensions import NotRequired
 
 from langgraph.prebuilt import InjectedState, ToolNode, create_react_agent
 from langgraph.prebuilt.chat_agent_executor import AgentState
-from langgraph.prebuilt.tool_node import ToolRuntime
 
 from .model import FakeToolCallingModel
 
@@ -53,6 +50,9 @@ def _create_mock_runtime(
     store=None,
 ):
     """Create a mock Runtime for testing ToolNode directly."""
+    from unittest.mock import Mock
+
+    from langgraph.runtime import Runtime
 
     mock_runtime = Mock(spec=Runtime)
     mock_runtime.context = {}
@@ -61,6 +61,7 @@ def _create_mock_runtime(
 
 def _create_config_with_runtime(store=None, state=None):
     """Create a RunnableConfig with mocked runtime for direct ToolNode testing."""
+    from langgraph.prebuilt.tool_node import ToolRuntime
 
     tool_runtime = ToolRuntime(
         state=state or {},

libs/prebuilt/tests/test_on_tool_call.py

@@ -1,6 +1,5 @@
 """Unit tests for tool call interceptor in ToolNode."""
 
-import functools
 from collections.abc import Callable
 from unittest.mock import Mock
 
@@ -1332,13 +1331,14 @@ def _config_with_channel_read(
     learn channel names. The stub matches the shape: partial whose second and
     third positional args are `channels` and `managed` mappings.
     """
+    import functools
 
     channels_stub = {k: None for k in channel_values}
     managed_stub: dict[str, object] = {}
 
     # Shape matches pregel's real partial:
     # functools.partial(local_read, scratchpad, channels, managed, task)
-    def _read(scratchpad, channels, managed, task, select, fresh):
+    def _read(scratchpad, channels, managed, task, select, fresh):  # noqa: ARG001
         if isinstance(select, str):
             return channel_values[select]
         return {k: channel_values[k] for k in select if k in channel_values}

libs/prebuilt/tests/test_tool_node.py

@@ -2,7 +2,6 @@ import contextlib
 import dataclasses
 import json
 import sys
-import warnings
 from functools import partial
 from typing import (
     Annotated,
@@ -24,12 +23,10 @@ from langchain_core.messages import (
 from langchain_core.runnables.config import RunnableConfig
 from langchain_core.tools import BaseTool, InjectedToolArg, ToolException
 from langchain_core.tools import tool as dec_tool
-from langchain_core.tools.base import InjectedToolCallId
 from langgraph.config import get_stream_writer
 from langgraph.errors import GraphBubbleUp, GraphInterrupt
 from langgraph.graph import START, MessagesState, StateGraph
 from langgraph.graph.message import REMOVE_ALL_MESSAGES, add_messages
-from langgraph.runtime import ExecutionInfo, ServerInfo
 from langgraph.store.base import BaseStore
 from langgraph.store.memory import InMemoryStore
 from langgraph.types import Command, Send
@@ -44,7 +41,6 @@ from langgraph.prebuilt import (
 )
 from langgraph.prebuilt.tool_node import (
     TOOL_CALL_ERROR_TEMPLATE,
-    ToolCallRequest,
     ToolInvocationError,
     ToolRuntime,
     tools_condition,
@@ -63,6 +59,7 @@ def _create_mock_runtime(store: BaseStore | None = None) -> Mock:
     which is injected by RunnableCallable from config["configurable"]["__pregel_runtime"].
     When testing ToolNode directly (outside a graph), we need to provide this manually.
     """
+    from langgraph.runtime import ExecutionInfo
 
     mock_runtime = Mock()
     mock_runtime.store = store
@@ -628,6 +625,7 @@ def test_tool_node_node_interrupt() -> None:
 
 @pytest.mark.parametrize("input_type", ["dict", "tool_calls"])
 async def test_tool_node_command(input_type: str) -> None:
+    from langchain_core.tools.base import InjectedToolCallId
 
     @dec_tool
     def transfer_to_bob(tool_call_id: Annotated[str, InjectedToolCallId]):
@@ -936,6 +934,7 @@ async def test_tool_node_command(input_type: str) -> None:
 
 
 async def test_tool_node_command_list_input() -> None:
+    from langchain_core.tools.base import InjectedToolCallId
 
     @dec_tool
     def transfer_to_bob(tool_call_id: Annotated[str, InjectedToolCallId]):
@@ -1195,6 +1194,7 @@ async def test_tool_node_command_list_input() -> None:
 
 
 def test_tool_node_parent_command_with_send() -> None:
+    from langchain_core.tools.base import InjectedToolCallId
 
     @dec_tool
     def transfer_to_alice(tool_call_id: Annotated[str, InjectedToolCallId]):
@@ -1282,6 +1282,7 @@ def test_tool_node_parent_command_with_send() -> None:
 
 
 async def test_tool_node_command_remove_all_messages() -> None:
+    from langchain_core.tools.base import InjectedToolCallId
 
     @dec_tool
     def remove_all_messages_tool(tool_call_id: Annotated[str, InjectedToolCallId]):
@@ -1620,6 +1621,9 @@ def test_tool_node_stream_writer() -> None:
 
 def test_tool_call_request_setattr_deprecation_warning():
     """Test that ToolCallRequest raises a deprecation warning on direct attribute modification."""
+    import warnings
+
+    from langgraph.prebuilt.tool_node import ToolCallRequest
 
     # Create a mock ToolCall
     tool_call = {"name": "test", "args": {"a": 1}, "id": "call_1", "type": "tool_call"}
@@ -2027,6 +2031,7 @@ def test_tool_runtime_defaults_tools_to_empty_list() -> None:
 
 def test_tool_runtime_forwards_execution_info_server_info_and_tools() -> None:
     """Test that execution_info, server_info, and tools are forwarded from Runtime to ToolRuntime."""
+    from langgraph.runtime import ExecutionInfo, ServerInfo
 
     exec_info = ExecutionInfo(
         thread_id="t-1",
@@ -2083,6 +2088,7 @@ async def test_tool_runtime_forwards_execution_info_server_info_and_tools_async(
     None
 ):
     """Test that execution_info, server_info, and tools are forwarded in async path."""
+    from langgraph.runtime import ExecutionInfo, ServerInfo
 
     exec_info = ExecutionInfo(
         thread_id="t-2",

libs/prebuilt/uv.lock

@@ -285,7 +285,7 @@ wheels = [
 
 [[package]]
 name = "langgraph"
-version = "1.2.11"
+version = "1.2.10"
 source = { editable = "../langgraph" }
 dependencies = [
     { name = "langchain-core" },
@@ -369,7 +369,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.2.0"
+version = "4.1.1"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -417,7 +417,7 @@ test = [
 
 [[package]]
 name = "langgraph-checkpoint-postgres"
-version = "3.1.2"
+version = "3.1.1"
 source = { editable = "../checkpoint-postgres" }
 dependencies = [
     { name = "langgraph-checkpoint" },
@@ -439,7 +439,6 @@ dev = [
     { name = "anyio" },
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -456,7 +455,6 @@ lint = [
 test = [
     { name = "anyio" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "psycopg", extras = ["binary"] },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -485,7 +483,6 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -501,7 +498,6 @@ lint = [
 ]
 test = [
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -625,13 +621,13 @@ dev = [
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watch" },
-    { name = "ruff", specifier = "==0.16.1" },
+    { name = "ruff", specifier = "==0.15.20" },
     { name = "starlette" },
     { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "ruff", specifier = "==0.16.1" },
+    { name = "ruff", specifier = "==0.15.20" },
     { name = "starlette" },
     { name = "ty" },
 ]

libs/sdk-py/MIGRATION.md

@@ -87,9 +87,7 @@ async with client.threads.stream(assistant_id="agent") as thread:
 
 ```python
 async with client.threads.stream(assistant_id="agent") as thread:
-    await thread.run.start(
-        input={"messages": [{"role": "user", "content": "book a flight"}]}
-    )
+    await thread.run.start(input={"messages": [{"role": "user", "content": "book a flight"}]})
 
     # Wait for the run to pause at an interrupt node.
     # thread.interrupted becomes True when input.requested arrives.

libs/sdk-py/README.md

@@ -43,9 +43,7 @@ thread = await client.threads.create()
 
 # Start a streaming run
 input = {"messages": [{"role": "human", "content": "what's the weather in la"}]}
-async for chunk in client.runs.stream(
-    thread["thread_id"], agent["assistant_id"], input=input
-):
+async for chunk in client.runs.stream(thread['thread_id'], agent['assistant_id'], input=input):
     print(chunk)
 ```
 
@@ -82,9 +80,9 @@ async with client.threads.stream(
     messages, tool_calls = await asyncio.gather(get_messages(), get_tool_calls())
 
     for stream in messages:
-        print(await stream.text)  # accumulated text
+        print(await stream.text)          # accumulated text
 
-    final = await thread.output  # terminal state values
+    final = await thread.output           # terminal state values
 ```
 
 ## 📕 Releases & Versioning

libs/sdk-py/langgraph_sdk/__init__.py

@@ -1,15 +1,8 @@
 from langgraph_sdk.auth import Auth
 from langgraph_sdk.client import get_client, get_sync_client
 from langgraph_sdk.encryption import Encryption
-from langgraph_sdk.encryption.types import DecryptResult, EncryptionContext
+from langgraph_sdk.encryption.types import EncryptionContext
 
-__version__ = "0.4.3"
+__version__ = "0.4.2"
 
-__all__ = [
-    "Auth",
-    "DecryptResult",
-    "Encryption",
-    "EncryptionContext",
-    "get_client",
-    "get_sync_client",
-]
+__all__ = ["Auth", "Encryption", "EncryptionContext", "get_client", "get_sync_client"]

libs/sdk-py/langgraph_sdk/encryption/__init__.py

@@ -18,9 +18,6 @@ import warnings
 
 from langgraph_sdk.encryption import types
 
-_BlobDecryptorT = typing.TypeVar("_BlobDecryptorT", bound=types.BlobDecryptor)
-_JsonDecryptorT = typing.TypeVar("_JsonDecryptorT", bound=types.JsonDecryptor)
-
 
 class LangGraphBetaWarning(UserWarning):
     """Warning for beta features in LangGraph SDK."""
@@ -144,7 +141,7 @@ class _DecryptDecorators:
     def __init__(self, parent: Encryption):
         self._parent = parent
 
-    def blob(self, fn: _BlobDecryptorT) -> _BlobDecryptorT:
+    def blob(self, fn: types.BlobDecryptor) -> types.BlobDecryptor:
         """Register a blob decryption handler.
 
         The handler will be called to decrypt opaque data like checkpoint blobs.
@@ -152,9 +149,7 @@ class _DecryptDecorators:
         Example:
             ```python
             @encryption.decrypt.blob
-            async def decrypt_blob(
-                ctx: EncryptionContext, blob: bytes
-            ) -> bytes | DecryptResult[bytes]:
+            async def decrypt_blob(ctx: EncryptionContext, blob: bytes) -> bytes:
                 # Decrypt the blob using your encryption service
                 return decrypted_blob
             ```
@@ -175,15 +170,13 @@ class _DecryptDecorators:
         self._parent._blob_decryptor = fn
         return fn
 
-    def json(self, fn: _JsonDecryptorT) -> _JsonDecryptorT:
+    def json(self, fn: types.JsonDecryptor) -> types.JsonDecryptor:
         """Register the JSON decryption handler.
 
         Example:
             ```python
             @encryption.decrypt.json
-            async def decrypt_json(
-                ctx: EncryptionContext, data: dict
-            ) -> dict | DecryptResult[dict]:
+            async def decrypt_json(ctx: EncryptionContext, data: dict) -> dict:
                 # Decrypt the data
                 return decrypt_data(data)
             ```
@@ -376,7 +369,7 @@ class Encryption:
     """Reference to encryption type definitions.
 
     Provides access to all type definitions used in the encryption system,
-    including EncryptionContext, DecryptResult, BlobEncryptor, BlobDecryptor,
+    including EncryptionContext, BlobEncryptor, BlobDecryptor,
     JsonEncryptor, and JsonDecryptor.
     """
 

libs/sdk-py/langgraph_sdk/encryption/types.py

@@ -9,30 +9,10 @@ from __future__ import annotations
 
 import typing
 from collections.abc import Awaitable, Callable
-from dataclasses import dataclass
 
 Json = dict[str, typing.Any]
 """JSON-serializable dictionary type for structured data encryption."""
 
-T = typing.TypeVar("T")
-
-
-@dataclass(frozen=True, slots=True)
-class DecryptResult(typing.Generic[T]):
-    """Decrypted data and optional replacement ciphertext.
-
-    Return this from a decrypt handler when encrypted data should be replaced,
-    such as after rotating its encryption key. Returning plaintext directly
-    remains supported when no replacement is needed.
-
-    Attributes:
-        plaintext: Decrypted data returned to the caller
-        replacement: New encrypted data to persist in place of the input
-    """
-
-    plaintext: T
-    replacement: T | None = None
-
 
 class EncryptionContext:
     """Context passed to encryption/decryption handlers.
@@ -77,9 +57,7 @@ Returns:
     Awaitable that resolves to encrypted bytes
 """
 
-BlobDecryptor = Callable[
-    [EncryptionContext, bytes], Awaitable[bytes | DecryptResult[bytes]]
-]
+BlobDecryptor = Callable[[EncryptionContext, bytes], Awaitable[bytes]]
 """Handler for decrypting opaque blob data like checkpoints.
 
 Note: Must be an async function. Decryption typically involves I/O operations
@@ -90,8 +68,7 @@ Args:
     blob: The encrypted bytes to decrypt
 
 Returns:
-    Awaitable that resolves to decrypted bytes, or a DecryptResult containing
-    decrypted bytes and replacement ciphertext
+    Awaitable that resolves to decrypted bytes
 """
 
 JsonEncryptor = Callable[[EncryptionContext, Json], Awaitable[Json]]
@@ -124,9 +101,7 @@ Returns:
     Awaitable that resolves to encrypted JSON dictionary
 """
 
-JsonDecryptor = Callable[
-    [EncryptionContext, Json], Awaitable[Json | DecryptResult[Json]]
-]
+JsonDecryptor = Callable[[EncryptionContext, Json], Awaitable[Json]]
 """Handler for decrypting structured JSON data.
 
 Note: Must be an async function. Decryption typically involves I/O operations
@@ -140,8 +115,7 @@ Args:
     data: The encrypted JSON dictionary
 
 Returns:
-    Awaitable that resolves to a decrypted JSON dictionary, or a DecryptResult
-    containing decrypted JSON and replacement ciphertext
+    Awaitable that resolves to decrypted JSON dictionary
 """
 
 if typing.TYPE_CHECKING:

libs/sdk-py/langgraph_sdk/schema.py

@@ -963,7 +963,7 @@ class _BaseModelLike(Protocol):
     ) -> dict[str, Any]: ...
 
 
-_JSONLike: TypeAlias = str | int | float | bool | None
+_JSONLike: TypeAlias = None | str | int | float | bool
 _JSONMap: TypeAlias = Mapping[
     str, Union[_JSONLike, list[_JSONLike], "_JSONMap", list["_JSONMap"]]
 ]

libs/sdk-py/pyproject.toml

@@ -36,7 +36,7 @@ test = [
     "pytest-watch",
 ]
 lint = [
-    "ruff==0.16.1",
+    "ruff==0.15.20",
     "codespell",
     "ty",
     "starlette",
@@ -80,7 +80,6 @@ select = [
   "SIM",    # flake8-simplify (code simplification)
   "RUF",    # ruff-specific rules
   "S101",   # flake8-bandit: use of assert
-  "PLC0415", # import-outside-top-level
 ]
 ignore = [
   "E501",   # line too long (handled by formatter)
@@ -88,10 +87,7 @@ ignore = [
   "B904",   # raise without from inside except (sometimes intentional)
   "SIM102", # nested if statements (sometimes clearer)
 ]
-# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
-# still has deferred imports that have not been reviewed, so it stays exempt
-# for now.
-per-file-ignores = { "tests/**" = ["S101", "B017"], "integration/**" = ["S101", "T20", "B017", "ARG001", "ARG002", "PLC0415"], "langgraph_sdk/**" = ["PLC0415"] }
+per-file-ignores = { "tests/**" = ["S101", "B017"], "integration/**" = ["S101", "T20", "B017", "ARG001", "ARG002"] }
 
 [tool.ty.src]
 # The `integration/` graphs run inside the docker image (with `deepagents`

libs/sdk-py/tests/integration/conftest.py

@@ -18,11 +18,6 @@ from collections.abc import AsyncIterator, Iterator
 import httpx
 import pytest
 
-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
-
 BASE_URL = os.environ.get("LANGGRAPH_INTEGRATION_URL", "http://localhost:2024")
 ASSISTANT_ID = "agent"
 TOOLS_ASSISTANT_ID = "tools_agent"
@@ -52,6 +47,8 @@ def _require_running_api() -> None:
 @pytest.fixture
 async def async_threads() -> AsyncIterator[tuple[object, httpx.AsyncClient]]:
     """Build an async ThreadsClient. Yields `(threads, raw_httpx)` so tests can close raw."""
+    from langgraph_sdk._async.http import HttpClient
+    from langgraph_sdk._async.threads import ThreadsClient
 
     raw = httpx.AsyncClient(base_url=BASE_URL, timeout=30.0)
     try:
@@ -63,6 +60,8 @@ async def async_threads() -> AsyncIterator[tuple[object, httpx.AsyncClient]]:
 @pytest.fixture
 def sync_threads() -> Iterator[tuple[object, httpx.Client]]:
     """Build a sync ThreadsClient. Yields `(threads, raw_httpx)` so tests can close raw."""
+    from langgraph_sdk._sync.http import SyncHttpClient
+    from langgraph_sdk._sync.threads import SyncThreadsClient
 
     raw = httpx.Client(base_url=BASE_URL, timeout=30.0)
     try:

libs/sdk-py/tests/integration/test_assistants.py

@@ -9,22 +9,21 @@ from __future__ import annotations
 
 import pytest
 
-from langgraph_sdk._async.assistants import AssistantsClient
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._sync.assistants import SyncAssistantsClient
-from langgraph_sdk._sync.http import SyncHttpClient
-
 from .conftest import ASSISTANT_ID
 
 pytestmark = pytest.mark.integration
 
 
 def _async_assistants(raw):
+    from langgraph_sdk._async.assistants import AssistantsClient
+    from langgraph_sdk._async.http import HttpClient
 
     return AssistantsClient(HttpClient(raw))
 
 
 def _sync_assistants(raw):
+    from langgraph_sdk._sync.assistants import SyncAssistantsClient
+    from langgraph_sdk._sync.http import SyncHttpClient
 
     return SyncAssistantsClient(SyncHttpClient(raw))
 

libs/sdk-py/tests/integration/test_cancel.py

@@ -10,11 +10,6 @@ from typing import Any
 
 import pytest
 
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.runs import RunsClient
-from langgraph_sdk._sync.http import SyncHttpClient
-from langgraph_sdk._sync.runs import SyncRunsClient
-
 from .conftest import ASSISTANT_ID
 
 pytestmark = pytest.mark.integration
@@ -34,6 +29,8 @@ async def _cancel_after_first_event(
 
 
 async def test_cancel_async(async_threads) -> None:
+    from langgraph_sdk._async.http import HttpClient
+    from langgraph_sdk._async.runs import RunsClient
 
     threads, raw = async_threads
     runs_client = RunsClient(HttpClient(raw))
@@ -91,6 +88,8 @@ def _cancel_after_first_event_sync(
 
 
 def test_cancel_sync(sync_threads) -> None:
+    from langgraph_sdk._sync.http import SyncHttpClient
+    from langgraph_sdk._sync.runs import SyncRunsClient
 
     threads, raw = sync_threads
     runs_client = SyncRunsClient(SyncHttpClient(raw))

libs/sdk-py/tests/integration/test_crons.py

@@ -10,22 +10,21 @@ from __future__ import annotations
 
 import pytest
 
-from langgraph_sdk._async.cron import CronClient
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._sync.cron import SyncCronClient
-from langgraph_sdk._sync.http import SyncHttpClient
-
 from .conftest import ASSISTANT_ID
 
 pytestmark = pytest.mark.integration
 
 
 def _async_crons(raw):
+    from langgraph_sdk._async.cron import CronClient
+    from langgraph_sdk._async.http import HttpClient
 
     return CronClient(HttpClient(raw))
 
 
 def _sync_crons(raw):
+    from langgraph_sdk._sync.cron import SyncCronClient
+    from langgraph_sdk._sync.http import SyncHttpClient
 
     return SyncCronClient(SyncHttpClient(raw))
 

libs/sdk-py/tests/integration/test_factory_graph.py

@@ -13,22 +13,21 @@ from __future__ import annotations
 
 import pytest
 
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.runs import RunsClient
-from langgraph_sdk._sync.http import SyncHttpClient
-from langgraph_sdk._sync.runs import SyncRunsClient
-
 from .conftest import FACTORY_ASSISTANT_ID
 
 pytestmark = pytest.mark.integration
 
 
 def _async_runs(raw):
+    from langgraph_sdk._async.http import HttpClient
+    from langgraph_sdk._async.runs import RunsClient
 
     return RunsClient(HttpClient(raw))
 
 
 def _sync_runs(raw):
+    from langgraph_sdk._sync.http import SyncHttpClient
+    from langgraph_sdk._sync.runs import SyncRunsClient
 
     return SyncRunsClient(SyncHttpClient(raw))
 

libs/sdk-py/tests/integration/test_runs.py

@@ -11,22 +11,21 @@ from __future__ import annotations
 
 import pytest
 
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.runs import RunsClient
-from langgraph_sdk._sync.http import SyncHttpClient
-from langgraph_sdk._sync.runs import SyncRunsClient
-
 from .conftest import ASSISTANT_ID
 
 pytestmark = pytest.mark.integration
 
 
 def _async_runs(raw):
+    from langgraph_sdk._async.http import HttpClient
+    from langgraph_sdk._async.runs import RunsClient
 
     return RunsClient(HttpClient(raw))
 
 
 def _sync_runs(raw):
+    from langgraph_sdk._sync.http import SyncHttpClient
+    from langgraph_sdk._sync.runs import SyncRunsClient
 
     return SyncRunsClient(SyncHttpClient(raw))
 

libs/sdk-py/tests/integration/test_store.py

@@ -10,20 +10,19 @@ import uuid
 
 import pytest
 
-from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.store import StoreClient
-from langgraph_sdk._sync.http import SyncHttpClient
-from langgraph_sdk._sync.store import SyncStoreClient
-
 pytestmark = pytest.mark.integration
 
 
 def _async_store(raw):
+    from langgraph_sdk._async.http import HttpClient
+    from langgraph_sdk._async.store import StoreClient
 
     return StoreClient(HttpClient(raw))
 
 
 def _sync_store(raw):
+    from langgraph_sdk._sync.http import SyncHttpClient
+    from langgraph_sdk._sync.store import SyncStoreClient
 
     return SyncStoreClient(SyncHttpClient(raw))
 

libs/sdk-py/tests/integration/test_websocket.py

@@ -4,11 +4,6 @@ from __future__ import annotations
 
 import pytest
 
-from langgraph_sdk.stream.transport import (
-    ProtocolWebSocketTransport,
-    SyncProtocolWebSocketTransport,
-)
-
 from .conftest import ASSISTANT_ID, EXPECTED_TERMINAL_ITEMS
 
 pytestmark = pytest.mark.integration
@@ -19,6 +14,8 @@ async def test_websocket_async(async_threads) -> None:
     async with threads.stream(
         assistant_id=ASSISTANT_ID, transport="websocket"
     ) as thread:
+        from langgraph_sdk.stream.transport import ProtocolWebSocketTransport
+
         assert isinstance(thread._transport, ProtocolWebSocketTransport)
 
         await thread.run.start(input={"messages": [], "value": "init", "items": []})
@@ -37,6 +34,8 @@ async def test_websocket_async(async_threads) -> None:
 def test_websocket_sync(sync_threads) -> None:
     threads, _ = sync_threads
     with threads.stream(assistant_id=ASSISTANT_ID, transport="websocket") as thread:
+        from langgraph_sdk.stream.transport import SyncProtocolWebSocketTransport
+
         assert isinstance(thread._transport, SyncProtocolWebSocketTransport)
 
         thread.run.start(input={"messages": [], "value": "init", "items": []})

libs/sdk-py/tests/streaming/test_controller.py

@@ -3,21 +3,14 @@
 from __future__ import annotations
 
 import asyncio
-import asyncio as _asyncio
-import logging
 from collections.abc import AsyncIterator
 from typing import Any
 from unittest.mock import AsyncMock
 
-import httpx
 import pytest
 
-from langgraph_sdk.stream.controller import (
-    StreamController,
-    _close_after,
-    _SeenEventIds,
-)
-from langgraph_sdk.stream.transport.http import EventStreamHandle, ProtocolSseTransport
+from langgraph_sdk.stream.controller import StreamController, _SeenEventIds
+from langgraph_sdk.stream.transport.http import EventStreamHandle
 
 # ---------------------------------------------------------------------------
 # Task 3.1: bounded subscription queues
@@ -27,6 +20,9 @@ from langgraph_sdk.stream.transport.http import EventStreamHandle, ProtocolSseTr
 @pytest.mark.asyncio
 async def test_subscription_queue_bounded_by_max_queue_size():
     """`StreamController` must create per-subscription queues bounded by `max_queue_size`."""
+    import httpx
+
+    from langgraph_sdk.stream.transport.http import ProtocolSseTransport
 
     transport = ProtocolSseTransport(
         client=httpx.AsyncClient(base_url="http://test"),
@@ -40,6 +36,9 @@ async def test_subscription_queue_bounded_by_max_queue_size():
 @pytest.mark.asyncio
 async def test_subscription_queue_default_max_queue_size_is_1024():
     """`StreamController` default `max_queue_size` is 1024."""
+    import httpx
+
+    from langgraph_sdk.stream.transport.http import ProtocolSseTransport
 
     transport = ProtocolSseTransport(
         client=httpx.AsyncClient(base_url="http://test"),
@@ -115,6 +114,12 @@ def test_seen_event_ids_iter_returns_keys():
 async def test_close_awaits_pending_rotation_closes():
     """When a rotation is mid-flight, controller.close() must await the old
     stream close before returning."""
+    import asyncio as _asyncio
+
+    import httpx
+
+    from langgraph_sdk.stream.controller import _close_after
+    from langgraph_sdk.stream.transport.http import ProtocolSseTransport
 
     rotation_close_done = _asyncio.Event()
 
@@ -264,6 +269,7 @@ async def test_reconnect_accepts_backoff_kwargs():
 @pytest.mark.anyio
 async def test_transport_drop_exception_logged_with_type(monkeypatch, caplog):
     """Bare `pass` discarded exception types; the drop should at least log."""
+    import logging
 
     monkeypatch.setattr("asyncio.sleep", AsyncMock())
 

libs/sdk-py/tests/streaming/test_decoders.py

@@ -8,8 +8,6 @@ from __future__ import annotations
 
 from typing import Any
 
-import pytest
-
 from langgraph_sdk.stream.decoders import (
     DataDecoder,
     ExtensionsDecoder,
@@ -456,6 +454,7 @@ def test_extensions_decoder_ignores_non_dict_data():
 
 
 def test_extensions_decoder_rejects_empty_name():
+    import pytest
 
     with pytest.raises(ValueError):
         ExtensionsDecoder(name="")

libs/sdk-py/tests/streaming/test_extensions_projection.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 import httpx
 
 from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.stream import ScopedStreamHandle
 from langgraph_sdk._async.threads import ThreadsClient
 from streaming._events import custom_event, lifecycle_completed_event
 from streaming._fake_server import FakeServer
@@ -47,6 +46,8 @@ async def test_extension_projection_supports_namespace_scope_on_subgraph_handle(
     )
     transport = httpx.ASGITransport(app=fake.app)
     async with httpx.AsyncClient(transport=transport, base_url="http://test") as raw:
+        from langgraph_sdk._async.stream import ScopedStreamHandle
+
         threads = ThreadsClient(HttpClient(raw))
         async with threads.stream(thread_id="t-1", assistant_id="agent") as thread:
             await thread.run.start(input={})

libs/sdk-py/tests/streaming/test_lifecycle_watcher.py

@@ -7,11 +7,9 @@ import contextlib
 from typing import Any
 
 import httpx
-import pytest
 
 from langgraph_sdk._async.http import HttpClient
 from langgraph_sdk._async.threads import ThreadsClient
-from langgraph_sdk.stream.transport import EventStreamHandle, ProtocolSseTransport
 from streaming._events import (
     input_requested_event,
     lifecycle_completed_event,
@@ -155,6 +153,7 @@ async def test_lifecycle_clean_eof_resolves_run_done_with_errored():
     """If the lifecycle SSE stream ends cleanly (server closes without a
     terminal `completed` or `errored` event), `_run_done` must resolve with
     an errored terminal so awaiters don't hang."""
+    import pytest
 
     fake = FakeServer()
     # Emit a non-terminal lifecycle event, then close cleanly without
@@ -180,6 +179,7 @@ async def test_lifecycle_mid_iteration_error_resolves_run_done_with_error(
     """If the transport reports an error via `handle.done` after iteration
     exits without a terminal lifecycle event, `_run_done` propagates the
     transport error rather than the generic clean-EOF message."""
+    from langgraph_sdk.stream.transport import EventStreamHandle, ProtocolSseTransport
 
     def synthetic_handle() -> EventStreamHandle:
         loop = asyncio.get_running_loop()

libs/sdk-py/tests/streaming/test_scoped_handles.py

@@ -2,16 +2,12 @@
 
 from __future__ import annotations
 
-from unittest.mock import MagicMock
-
 import httpx
 
 from langgraph_sdk._async.http import HttpClient
-from langgraph_sdk._async.stream import ScopedStreamHandle
 from langgraph_sdk._async.threads import ThreadsClient
 from streaming._events import (
     lifecycle_completed_event,
-    lifecycle_errored_event,
     lifecycle_started_event,
     message_finish_event,
     message_start_event,
@@ -434,6 +430,9 @@ async def test_grandchild_events_dispatched_to_correct_sibling_not_first_match()
 
 def test_scoped_handle_inboxes_bounded_by_max_queue_size():
     """ScopedStreamHandle with max_queue_size=N creates queues with maxsize=N."""
+    from unittest.mock import MagicMock
+
+    from langgraph_sdk._async.stream import ScopedStreamHandle
 
     fake_thread = MagicMock()
     handle = ScopedStreamHandle(
@@ -485,6 +484,7 @@ async def test_force_complete_uses_failed_when_run_errored():
     """If the lifecycle signals an errored run, scoped children that are still
     'started' when the subgraphs projection's finally block runs must be
     force-finished as 'failed', not 'completed'."""
+    from streaming._events import lifecycle_errored_event
 
     fake = FakeServer()
     fake.script(
@@ -538,6 +538,9 @@ async def test_force_complete_uses_completed_when_run_completed():
 
 def test_close_inboxes_does_not_enqueue_on_uniterated_inboxes():
     """_close_inboxes must not push a sentinel on inboxes that had no consumer."""
+    from unittest.mock import MagicMock
+
+    from langgraph_sdk._async.stream import ScopedStreamHandle
 
     fake_thread = MagicMock()
     handle = ScopedStreamHandle(
@@ -556,6 +559,9 @@ def test_close_inboxes_does_not_enqueue_on_uniterated_inboxes():
 def test_close_inboxes_enqueues_sentinel_on_iterated_inboxes():
     """_close_inboxes must push a None sentinel only on inboxes that had a consumer,
     so projection iterators see the EOF signal."""
+    from unittest.mock import MagicMock
+
+    from langgraph_sdk._async.stream import ScopedStreamHandle
 
     fake_thread = MagicMock()
     handle = ScopedStreamHandle(