langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- create_react_agent formats the whole state into an unused error message on every model call
- StateGraph ignores reducers wrapped in ReadOnly TypedDict qualifiers
- Conditional router returning a non-`path_map` value raises a bare `KeyError` with no context
- 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
- Functional API with a cache: concurrent nested tasks fail with "dictionary changed size during iteration" in `match_cached_writes`
- feat(langgraph): apply input inserted into a running run at declared safe steps
- Failed update_state as __input__ makes the next DeltaChannel input vanish
- Overwrite with a rejected message dict breaks a messages DeltaChannel thread
- [prebuilt]: ToolRuntime docstring references nonexistent .write() method
- Async SSE transport shutdown blocks or raises QueueFull when its event queue is full
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- Python not yet supported