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Title: errors | langgraph | LangChain Reference

Open Graph Title: errors | langgraph

X Title: errors | langgraph

Description: Python API reference for errors in langgraph. Part of the LangChain ecosystem.

Open Graph Description: Python API reference for errors in langgraph. Part of the LangChain ecosystem.

X Description: Python API reference for errors in langgraph. Part of the LangChain ecosystem.

Opengraph URL: https://reference.langchain.com/python/langgraph/errors

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Domain: reference.langchain.com

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twitter:imagehttps://reference.langchain.com/og/python/langgraph/errors

Links:

LangChain Reference home pagehttps://reference.langchain.com/
GitHubhttps://github.com/langchain-ai
Main Docshttps://docs.langchain.com/oss/python/langgraph
Deep Agentshttps://reference.langchain.com/python/deepagents
LangChainhttps://reference.langchain.com/python/langchain/overview
LangGraphhttps://reference.langchain.com/python/langgraph/overview
Integrationshttps://reference.langchain.com/python/integrations/overview
LangSmithhttps://reference.langchain.com/python/langsmith
Overviewhttps://reference.langchain.com/python/langgraph/overview
Overviewhttps://reference.langchain.com/python/langgraph
Graphshttps://reference.langchain.com/python/langgraph/graphs
Functional APIhttps://reference.langchain.com/python/langgraph/func
Pregelhttps://reference.langchain.com/python/langgraph/pregel
Checkpointinghttps://reference.langchain.com/python/langgraph/checkpoints
Storagehttps://reference.langchain.com/python/langgraph/store
Cachinghttps://reference.langchain.com/python/langgraph/cache
Typeshttps://reference.langchain.com/python/langgraph/types
Runtimehttps://reference.langchain.com/python/langgraph/runtime
Confighttps://reference.langchain.com/python/langgraph/config
Errorshttps://reference.langchain.com/python/langgraph/errors
Constantshttps://reference.langchain.com/python/langgraph/constants
Channelshttps://reference.langchain.com/python/langgraph/channels
Agentshttps://reference.langchain.com/python/langgraph/agents
LangGraph Checkpointhttps://reference.langchain.com/python/langgraph.checkpoint
LangGraph Storehttps://reference.langchain.com/python/langgraph.store
Checkpoint Postgreshttps://reference.langchain.com/python/langgraph.checkpoint.postgres
Store Postgreshttps://reference.langchain.com/python/langgraph.store.postgres
Checkpoint SQLitehttps://reference.langchain.com/python/langgraph.checkpoint.sqlite
LangGraph Prebuilthttps://reference.langchain.com/python/langgraph.prebuilt
LangGraph CLIhttps://reference.langchain.com/python/langgraph-cli
LangGraph SDKhttps://reference.langchain.com/python/langgraph-sdk
LangGraph Supervisorhttps://reference.langchain.com/python/langgraph-supervisor
LangGraph Swarmhttps://reference.langchain.com/python/langgraph-swarm
https://chat.langchain.com/
Overviewhttps://reference.langchain.com/python/langgraph
Graphshttps://reference.langchain.com/python/langgraph/graphs
Functional APIhttps://reference.langchain.com/python/langgraph/func
Pregelhttps://reference.langchain.com/python/langgraph/pregel
Checkpointinghttps://reference.langchain.com/python/langgraph/checkpoints
Storagehttps://reference.langchain.com/python/langgraph/store
Cachinghttps://reference.langchain.com/python/langgraph/cache
Typeshttps://reference.langchain.com/python/langgraph/types
Runtimehttps://reference.langchain.com/python/langgraph/runtime
Confighttps://reference.langchain.com/python/langgraph/config
Errorshttps://reference.langchain.com/python/langgraph/errors
Constantshttps://reference.langchain.com/python/langgraph/constants
Channelshttps://reference.langchain.com/python/langgraph/channels
Agentshttps://reference.langchain.com/python/langgraph/agents
LangGraph Checkpointhttps://reference.langchain.com/python/langgraph.checkpoint
LangGraph Storehttps://reference.langchain.com/python/langgraph.store
Checkpoint Postgreshttps://reference.langchain.com/python/langgraph.checkpoint.postgres
Store Postgreshttps://reference.langchain.com/python/langgraph.store.postgres
Checkpoint SQLitehttps://reference.langchain.com/python/langgraph.checkpoint.sqlite
LangGraph Prebuilthttps://reference.langchain.com/python/langgraph.prebuilt
LangGraph CLIhttps://reference.langchain.com/python/langgraph-cli
LangGraph SDKhttps://reference.langchain.com/python/langgraph-sdk
LangGraph Supervisorhttps://reference.langchain.com/python/langgraph-supervisor
LangGraph Swarmhttps://reference.langchain.com/python/langgraph-swarm
langgraphhttps://reference.langchain.com/python/langgraph
ClassErrorCodehttps://reference.langchain.com/python/langgraph/errors/ErrorCode
ClassGraphBubbleUphttps://reference.langchain.com/python/langgraph/errors/GraphBubbleUp
ClassGraphDrainedRaised when a graph run exits early due to a drain request. This indicates the graph stopped cooperatively at a superstep boundary because RunControl.request_drain() was called (e.g., in response thttps://reference.langchain.com/python/langgraph/errors/GraphDrained
ClassGraphRecursionErrorRaised when the graph has exhausted the maximum number of steps. This prevents infinite loops. To increase the maximum number of steps, run your graph with a config specifying a higher `recursion_limhttps://reference.langchain.com/python/langgraph/errors/GraphRecursionError
ClassInvalidUpdateErrorRaised when attempting to update a channel with an invalid set of updates. Troubleshooting guides: [INVALID_CONCURRENT_GRAPH_UPDATE](https://docs.langchain.com/oss/python/langgraph/INVALID_CONCU https://reference.langchain.com/python/langgraph/errors/InvalidUpdateError
ClassGraphInterruptRaised when a subgraph is interrupted, suppressed by the root graph. Never raised directly, or surfaced to the user.https://reference.langchain.com/python/langgraph/errors/GraphInterrupt
ClassParentCommandhttps://reference.langchain.com/python/langgraph/errors/ParentCommand
ClassEmptyInputErrorRaised when graph receives an empty input.https://reference.langchain.com/python/langgraph/errors/EmptyInputError
ClassTaskNotFoundRaised when the executor is unable to find a task (for distributed mode).https://reference.langchain.com/python/langgraph/errors/TaskNotFound
ClassNodeErrorFailure context passed to a node-level error handler. Inject by adding a parameter typed NodeError to a handler registered via StateGraph.add_node(..., error_handler=...): def handler( https://reference.langchain.com/python/langgraph/errors/NodeError
ClassNodeCancelledErrorRaised when a node body raises asyncio.CancelledError itself. asyncio.CancelledError is a BaseException and the pregel runner treats cancelled task futures as silent tear-down (e.g. whenhttps://reference.langchain.com/python/langgraph/errors/NodeCancelledError
ClassNodeTimeoutErrorRaised when a node invocation exceeds one of its configured timeouts. Does not inherit from the built-in TimeoutError (a subclass of OSError) so that the default RetryPolicy treats it as rehttps://reference.langchain.com/python/langgraph/errors/NodeTimeoutError
ClassNodeInterruptdeprecatedRaised by a node to interrupt execution.https://reference.langchain.com/python/langgraph/errors/NodeInterrupt
Functioncreate_error_messagehttps://reference.langchain.com/python/langgraph/errors/create_error_message
Functionis_invalid_resumeWhether error was raised because a resume value didn't match response_schema. interrupt() raises a pydantic.ValidationError in that case. ToolNode uses this to tell it apart from invalid tohttps://reference.langchain.com/python/langgraph/errors/is_invalid_resume

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