Issues

Stale `module_name` arg in `create_model` docstring (libs/langgraph/_internal/_pydantic.py)

langchain-ai/langgraph#9359 · opened

on Oct 20, 2026

sdk-py: WebSocket thread streams reconnect after a terminal error frame followed by 1011

langchain-ai/langgraph#9357 · opened

on Oct 20, 2026

Strict-mode msgpack deserialization admits Send/Command/Overwrite control types before the allowlist check

langchain-ai/langgraph#9356 · opened

on Oct 20, 2026

`Command(graph=Command.PARENT)` from a `checkpointer=True` subgraph leaks as `ParentCommand` when the enclosing node is retried

Bug

langchain-ai/langgraph#9353 · opened

on Oct 19, 2026

1

A subgraph compiled with `checkpointer=True` returns its previous run's output when it is called again right after a static breakpoint

Bug

langchain-ai/langgraph#9346 · opened

on Oct 18, 2026

1

`get_state()` does not report an interrupt raised inside a node's `error_handler`

Bug

langchain-ai/langgraph#9345 · opened

on Oct 18, 2026

4

Command(update=...) on a new thread applies the update twice

langchain-ai/langgraph#9344 · opened

on Oct 18, 2026

2

JsonPlusSerializer drops pydantic v2 fields declared with an alias on checkpoint round trip

langchain-ai/langgraph#9343 · opened

on Oct 18, 2026

5

Server composes the custom-auth store filter with the client filter as a top-level `$and` no backend supports — search silently empty (InMemory/Postgres) or raises (SQLite); with a preset `$and`-valued field it returns rows that fail the auth condition

langchain-ai/langgraph#9342 · opened

on Oct 17, 2026

5

ToolNode error handlers with postponed union annotations raise AttributeError

langchain-ai/langgraph#9338 · opened

on Oct 17, 2026

1

SqliteStore and AsyncSqliteStore reset created_at when updating an existing item

langchain-ai/langgraph#9331 · opened

on Oct 16, 2026

1

create_react_agent formats the whole state into an unused error message on every model call

langchain-ai/langgraph#9328 · opened

on Oct 16, 2026

1

add_conditional_edges ignores the Literal return hint of a callable-class router, so the graph drawing loses the branch edges

langchain-ai/langgraph#9327 · opened

on Oct 16, 2026

2

add_messages skips merging, deletion and format= for messages after RemoveMessage(id=REMOVE_ALL_MESSAGES)

langchain-ai/langgraph#9326 · opened

on Oct 16, 2026

2

get_input_jsonschema() fails on the declared pydantic floor (>=2.7.4) for TypedDict states using Annotated[Required[...]] / Annotated[NotRequired[...]]; works from pydantic 2.11

langchain-ai/langgraph#9320 · opened

on Oct 15, 2026

3

Conditional router returning a non-`path_map` value raises a bare `KeyError` with no context

langchain-ai/langgraph#9319 · opened

on Oct 15, 2026

1

StateGraph ignores reducers wrapped in ReadOnly TypedDict qualifiers

langchain-ai/langgraph#9311 · opened

on Oct 14, 2026

1

Functional API with a cache: concurrent nested tasks fail with "dictionary changed size during iteration" in `match_cached_writes`

Bug

langchain-ai/langgraph#9304 · opened

on Oct 14, 2026

3

[sdk-py]: comment-only SSE heartbeats emit phantom events after an event ID

langchain-ai/langgraph#9299 · opened

on Oct 13, 2026

1

[prebuilt]: ToolRuntime docstring references nonexistent .write() method

Bug

langchain-ai/langgraph#9294 · opened

on Oct 13, 2026

2

Overwrite with a rejected message dict breaks a messages DeltaChannel thread

langchain-ai/langgraph#9292 · opened

on Oct 13, 2026

1

Failed update_state as input makes the next DeltaChannel input vanish

langchain-ai/langgraph#9291 · opened

on Oct 13, 2026

1

`@task` awaited inside a StateGraph node returns `None` under `astream_events` (node path; #4084 covered only the functional API)

langchain-ai/langgraph#9284 · opened

on Oct 12, 2026

4

Async SSE transport shutdown blocks or raises QueueFull when its event queue is full

langchain-ai/langgraph#9282 · opened

on Oct 12, 2026

2

Functional API deadlocks when a task waits on a child task and max_concurrency (or the thread pool) is exhausted

Bug

langchain-ai/langgraph#9280 · opened

on Oct 12, 2026

4

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Issues

Stale `module_name` arg in `create_model` docstring (libs/langgraph/_internal/_pydantic.py)

sdk-py: WebSocket thread streams reconnect after a terminal error frame followed by 1011

Strict-mode msgpack deserialization admits Send/Command/Overwrite control types before the allowlist check

`Command(graph=Command.PARENT)` from a `checkpointer=True` subgraph leaks as `ParentCommand` when the enclosing node is retried

A subgraph compiled with `checkpointer=True` returns its previous run's output when it is called again right after a static breakpoint

`get_state()` does not report an interrupt raised inside a node's `error_handler`

Command(update=...) on a new thread applies the update twice

JsonPlusSerializer drops pydantic v2 fields declared with an alias on checkpoint round trip

Server composes the custom-auth store filter with the client filter as a top-level `$and` no backend supports — search silently empty (InMemory/Postgres) or raises (SQLite); with a preset `$and`-valued field it returns rows that fail the auth condition

ToolNode error handlers with postponed union annotations raise AttributeError

SqliteStore and AsyncSqliteStore reset created_at when updating an existing item

create_react_agent formats the whole state into an unused error message on every model call

add_conditional_edges ignores the Literal return hint of a callable-class router, so the graph drawing loses the branch edges

add_messages skips merging, deletion and format= for messages after RemoveMessage(id=REMOVE_ALL_MESSAGES)

get_input_jsonschema() fails on the declared pydantic floor (>=2.7.4) for TypedDict states using Annotated[Required[...]] / Annotated[NotRequired[...]]; works from pydantic 2.11

Conditional router returning a non-`path_map` value raises a bare `KeyError` with no context

StateGraph ignores reducers wrapped in ReadOnly TypedDict qualifiers

Functional API with a cache: concurrent nested tasks fail with "dictionary changed size during iteration" in `match_cached_writes`

[sdk-py]: comment-only SSE heartbeats emit phantom events after an event ID

[prebuilt]: ToolRuntime docstring references nonexistent .write() method

Overwrite with a rejected message dict breaks a messages DeltaChannel thread

Failed update_state as input makes the next DeltaChannel input vanish

`@task` awaited inside a StateGraph node returns `None` under `astream_events` (node path; #4084 covered only the functional API)

Async SSE transport shutdown blocks or raises QueueFull when its event queue is full

Functional API deadlocks when a task waits on a child task and max_concurrency (or the thread pool) is exhausted