langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- [Integration / Checkpointer] Zero-Daemon Sub-Millisecond SQLite WAL CheckpointSaver (LetItLoop)
- InMemorySaver read misses create ghost thread entries and grow storage
- SqliteStore: deleted items leave their embeddings in store_vectors (ON DELETE CASCADE never fires)
- Cache namespace collapses to "__dynamic__" for non-function callables, so different graphs sharing a cache return each other's results
- Checkpoint numpy codec: structured dtypes corrupt silently, object arrays persist raw pointers, and round-tripped arrays are read-only
- Topic/NamedBarrierValue checkpoint() returns the live container, so durability="async" persists a later superstep's values into an earlier checkpoint
- InMemoryStore reads create namespaces, so list_namespaces() reports namespaces that were never written
- Use langgraph-api in-memory extra for local development
- Failed to build `jsonschema-rs==0.29.1`
- ToolNode hijacks regular tool parameters named "runtime" for ToolRuntime injection
- Docs
- Python not yet supported