langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- fix(langgraph): honor per-node cache_policy=None with set_node_defaults
- Allow binding `context` at the graph level (so servers don't seed the internal runtime slot)
- Topic/NamedBarrierValue from_checkpoint aliases the checkpoint container instead of copying
- fix(langgraph): treat DeltaChannel Overwrite as a hard reset in update()
- fix(checkpoint): replay migrated delta writes through a plain seed
- langgraph-api 0.9.0: request validator rejects stream_mode "tools"/"lifecycle" though StreamMode type & runtime accept them (breaks useStream toolProgress on self-hosted)
- ToolNode silently overwrites duplicate tool names before dispatch
- ToolNode accepts ToolMessage results bound to sibling tool_call_id values
- Bug: ToolNode._normalize_tool_response raises TypeError for MCP tools returning content block lists
- Nested astream_events(v3) inside a tool yields empty messages due to parent callback leaking via contextvar
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- Python not yet supported