langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- numpy scalars (np.float64, np.int64, np.bool_) fail to serialize in JsonPlusSerializer
- Command resume misclassifies ordinary dictionary values as interrupt maps
- Store pagination: negative limit/offset silently drops results in InMemoryStore and diverges across store implementations
- DeltaChannel: get_delta_channel_history treats a None channel value as a valid seed, breaking migrated threads
- C-contiguous datetime64/timedelta64 numpy arrays fail to serialize in JsonPlusSerializer
- Checkpoint serialization rejects any int outside the 64-bit range (TypeError) though Decimal of the same value is supported
- langgraph_cli reads JSON config files with the locale encoding, silently corrupting non-ASCII langgraph.json
- stream_mode="values" skips a step when a node returns None or {}, while "updates" emits it
- checkpoint-postgres test matrix runs PostgreSQL 16 twice instead of 15 and 16
- Checkpoint savers disagree on list(limit=-1): InMemorySaver returns nothing, SQLite savers return everything
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- Python not yet supported