langchain-ai/langgraph · error · RuntimeError

thread.run.respond: interrupt_id {interrupt_id!r} does not m

Error message

thread.run.respond: interrupt_id {interrupt_id!r} does not match any outstanding interrupt in `thread.interrupts`.

What it means

Error "thread.run.respond: interrupt_id {interrupt_id!r} does not match any outstanding interrupt in `thread.interrupts`." thrown in langchain-ai/langgraph.

Source

Thrown at libs/sdk-py/langgraph_sdk/_sync/stream.py:273

                raise RuntimeError(
                    "thread.run.respond: no outstanding interrupt. Provide an "
                    "explicit `interrupt_id` or wait for `thread.interrupted`."
                )
            if len(outstanding) > 1:
                ids = [p["interrupt_id"] for p in outstanding]
                raise RuntimeError(
                    f"thread.run.respond: ambiguous — {len(outstanding)} "
                    f"outstanding interrupts ({ids!r}). Provide an explicit "
                    "`interrupt_id`."
                )
            match = outstanding[0]
        else:
            match = next(
                (p for p in outstanding if p["interrupt_id"] == interrupt_id),
                None,
            )
            if match is None:
                raise RuntimeError(
                    f"thread.run.respond: interrupt_id {interrupt_id!r} does not "
                    "match any outstanding interrupt in `thread.interrupts`."
                )
        params = {
            "interrupt_id": match["interrupt_id"],
            "namespace": match["namespace"],
            "response": response,
        }
        return self._owner._send_command("input.respond", params)


class _SyncValuesProjection:
    """Typed projection for `thread.values`.

    Supports `for snapshot in thread.values` (REST snapshot then live stream
    events) and `thread.values.get()` (delegates to `thread.output`).
    """

View on GitHub (pinned to 38031739e5)

When it happens

Trigger: Thrown at libs/sdk-py/langgraph_sdk/_sync/stream.py:273 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of langchain-ai/langgraph@38031739e5 (2026-08-26). Data as JSON: /api/errors/e672fb5f924a6494. Report an issue: GitHub.