Is interrupt not supported in astream_events?

[ivanzhu109]

Is interrupt not supported in astream_events?

[dosubot[bot]]

Interrupt is not supported as a built-in feature in astream_events. There’s no API or parameter to pause, stop, or cancel a stream from within LangChain itself. If you need to interrupt a stream, you have to cancel the underlying Python async task (for example, by raising asyncio.CancelledError), but this is not managed or exposed by LangChain—it's just standard Python async behavior. Resuming after interruption isn’t supported; you’d need to restart the operation from the beginning. For more details, see the relevant code and discussion here and here.

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[ivanzhu109]

Does astream_events not support using interrupt for human approval?

python
def human_approval(state: State) -> Command[Literal["some_node", "another_node"]]:
    is_approved = interrupt(
        {
            "question": "Is this correct?",
            # Surface the output that should be
            # reviewed and approved by the human.
            "llm_output": state["llm_output"]
        }
    )

    if is_approved:
        return Command(goto="some_node")
    else:
        return Command(goto="another_node")

[dosubot[bot]]

No, astream_events does not support using an interrupt for human approval. There’s no built-in way to pause or await human input within a streaming workflow—interruption is only possible by cancelling the underlying async task, not by pausing and resuming mid-stream. If you need human-in-the-loop approval, you’ll need to orchestrate it outside the stream, for example by checkpointing state and restarting the workflow after approval, rather than pausing and resuming within astream_events itself. See more details in this discussion: link and code reference: link. If you want help with patterns for human approval, let me know!

To reply, just mention @dosu.

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