langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- InMemoryStore vector search returns nan similarity scores for zero-norm query vectors (numpy path)
- draw_mermaid: Union of Literal should be treated same as multiple constant literal while rendering
- Agent Server protocol v2: initial replay lacks a run/checkpoint boundary after thread hydration
- msgpack serializer fails on pathlib.PurePath and range objects
- LangGraph Cloud: AsyncConnectionPool.worker leaves pending tasks (Sentry: Task was destroyed but it is pending!)
- langgraph-api: opentelemetry-exporter-prometheus<0.59 pin makes 0.11.0+ uninstallable with pydantic-ai 2.x / logfire>=4.16
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- chore: add session_name to runs params
- InMemoryStore upsert overwrites created_at on existing keys
- Checkpoint serialization rejects range and PurePath variants (TypeError) -- same gap as Fraction/complex in #8185
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- Python not yet supported