langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- 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
- Add HVTracker badge to README?
- Proposal: URML (substrate-neutral robot intent) manifest declaration for LangGraph as an agent-orchestration substrate
- langgraph-checkpoint-postgres + psycopg 3: `aget_tuple` raises `operator does not exist: text = bytea` on fresh thread / empty checkpoint_ns
- sdk-py SSEDecoder drops required newlines between repeated `data:` fields
- v3 stream.subgraphs doesn't detect sub-agents invoked inside tool functions
- RFC: Cross-node write-intent registry for parallel graph execution
- No module named 'langgraph.stream' in langgraph-prebuilt 1.1.0
- Docs
- Python not yet supported