langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- Race condition in PregelLoop.put_writes() causes silent checkpoint data loss
- CLI analytics can keep commands alive because urlopen has no timeout
- `langgraph dev` (inmem runtime): deleting a thread leaks its channel blobs — unbounded memory growth in long-running dev servers
- durability="sync": put_writes/put persistence order is unenforced, so post-crash recovery (replay vs re-execute) is host-dependent
- default_cache_key collides distinct inputs that share tobytes() (numpy dtype / PIL palette) when passed as keyword args
- docs(checkpoint,checkpoint-postgres): clarify `Store` value and namespace semantics
- 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
- langgraph-api 0.9.0: request validator rejects stream_mode "tools"/"lifecycle" though StreamMode type & runtime accept them (breaks useStream toolProgress on self-hosted)
- Docs
- Python not yet supported