langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- Regression in 1.1.7 (#7498): time travel to a subgraph checkpoint reruns the whole subgraph from __start__
- AsyncThreadStream.close() does not unblock active subscribe() iterators
- Bug: PUSH child task deduplication fails on parent retry
- JsonPlusSerializer silently deserializes a set/frozenset of tuples to None
- InMemoryStore filter $ne includes items missing the field — should it match Postgres (exclude) or Mongo (include)?
- InMemoryStore vector search returns nan similarity scores for zero-norm query vectors (numpy path)
- Agent Server protocol v2: initial replay lacks a run/checkpoint boundary after thread hydration
- chore: add session_name to runs params
- Checkpoint serialization rejects range and PurePath variants (TypeError) -- same gap as Fraction/complex in #8185
- StateGraph silently drops node output keys not declared in TypedDict
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- Python not yet supported