Waymark / Routes / docs.langchain.com/langgraph Pause a LangGraph graph mid-run and resume after human approval using interrupt()
domain: docs.langchain.com/langgraph · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed
Verified steps Inside a node function, call interrupt(payload) with a dict describing what the human needs to review — execution pauses immediately The caller receives the interrupt payload in the graph result under the __interrupt__ key Present the payload to the human (UI, Slack, email) and collect their response Resume the graph by calling graph.invoke(Command(resume=human_response), config=same_thread_config) The node receives the human response as the return value of interrupt() and continues execution from that point A checkpointer must be attached to the graph — interrupt() requires persistent state to pause and resume correctly Known gotchas A graph without a checkpointer cannot be interrupted — interrupt() raises an error if no checkpointer is configured Invoking the graph with a new input instead of Command(resume=...) starts a fresh run, discarding the paused state Multiple interrupt() calls in one node are supported but each requires a separate resume invocation
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