langgraph
https://github.com/langchain-ai/langgraph
Python
Build resilient language agents as graphs.
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- Issues
- PostgresStore and SqliteStore don't backfill non-indexed items on vector search (diverges from InMemoryStore)
- Traced conditional edges that return `Send` log `repr()` of the full payload (N × state size), with no way to opt out
- StateGraph._is_field_binop rejects valid reducers like set.union, functions with default args, and variadics`
- `bug: Send.__hash__ raises TypeError: unhashable type: 'dict' on standard dictionary payloads`
- Command.__repr__ calls asdict(self) causing TypeError: cannot pickle on unpicklable state and expensive deepcopy`
- Python SDK runs.join_stream loses stream modes when passed a list
- ToolNode: test_tool_node_node_interrupt's assertion never runs (dead code inside pytest.raises block)
- InMemoryStore equality filters treat JSON booleans as the numbers 0 and 1
- CLI: `langgraph build` fails when a local dependency ships its own requirements.txt
- retry_on as a name raises isinstance's TypeError instead of the documented one and skips every retry
- Docs
- Python not yet supported