LangGraph.js API Reference
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    Function interrupt

    • Interrupts the execution of a graph node. This function can be used to pause execution of a node, and return the value of the resume input when the graph is re-invoked using Command. Multiple interrupts can be called within a single node, and each will be handled sequentially.

      When an interrupt is called:

      1. If there's a resume value available (from a previous Command), it returns that value.
      2. Otherwise, it throws a GraphInterrupt with the provided value
      3. The graph can be resumed by passing a Command with a resume value

      Because the interrupt function propagates by throwing a special GraphInterrupt error, you should avoid using try/catch blocks around the interrupt function, or if you do, ensure that the GraphInterrupt error is thrown again within your catch block.

      Type Parameters

      • I = unknown
      • R = any

      Parameters

      • value: I

        The value to include in the interrupt. This will be available in task.interrupts[].value

      Returns R

      The resume value provided when the graph is re-invoked with a Command

      // Define a node that uses multiple interrupts
      const nodeWithInterrupts = () => {
        // First interrupt - will pause execution and include {value: 1} in task values
        const answer1 = interrupt({ value: 1 });

        // Second interrupt - only called after first interrupt is resumed
        const answer2 = interrupt({ value: 2 });

        // Use the resume values
        return { myKey: answer1 + " " + answer2 };
      };

      // Resume the graph after first interrupt
      await graph.stream(new Command({ resume: "answer 1" }));

      // Resume the graph after second interrupt
      await graph.stream(new Command({ resume: "answer 2" }));
      // Final result: { myKey: "answer 1 answer 2" }

      If called outside the context of a graph

      When no resume value is available

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