langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- feat: Queue/steer graphs while running
- Cache namespace collapses to "__dynamic__" for non-function callables, so different graphs sharing a cache return each other's results
- error_handler runs but the original exception is still raised (parallel nodes, custom/messages streaming, subgraphs=True)
- fix(cli): remove discontinued local debugger image
- ToolNode async execution ignores RunnableConfig.max_concurrency for multiple tool calls
- [Feature Proposal] Durable tool execution idempotency & retry middleware
- draw_mermaid: Union of Literal should be treated same as multiple constant literal while rendering
- StateGraph silently drops node output keys not declared in TypedDict
- State channels are reference-transparent end-to-end (read AND write) — local_read()'s missing copy() is a symptom, not the root cause (LastValue et al. alias caller/node objects from the first .invoke())
- durability="sync": put_writes/put persistence order is unenforced, so post-crash recovery (replay vs re-execute) is host-dependent
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