langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- Allow a state channel to be checkpointed/restorable but excluded from `StateSnapshot.values`
- ToolNode reports an empty error message for model-level (cross-field) validation errors
- Toggling `defer` on a single-predecessor node breaks resumed threads: TypeError unpacking the branch channel
- Graph lifecycle managers dispatch to instrumentor-injected handlers: _filter_graph_handlers runs before BaseCallbackManager.__init__
- Toggling defer on a fan-in node breaks resumed threads: silent barrier corruption one way, ValueError the other
- StateGraph.compile() fails on the second call with a default error handler
- perf(cli): cache the Node install layer across source-only changes
- Improve checkpoint serialization errors by including the state path of unserializable values
- checkpoint-sqlite: TTL sweepers outlive `from_conn_string` contexts
- checkpoint-sqlite: failed store batches can partially commit changes
- Docs
- Python not yet supported