> ## Documentation Index
> Fetch the complete documentation index at: https://docs.comfycontrol.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Interrupt Runner

> Send an interrupt signal to stop the current execution on a runner

## Overview

Send an interrupt signal to a ComfyUI runner to stop its current workflow execution. This is useful for cancelling long-running or stuck operations.

<Warning>
  This sends an interrupt signal directly to the ComfyUI instance. The current workflow execution will be stopped immediately.
</Warning>

## Path Parameters

<ParamField path="id" type="string" required>
  The unique identifier (UUID) of the runner to interrupt.
</ParamField>

## Response

Returns a 200 OK status with no body on successful interrupt.

## Example Response

```
Status: 200 OK
```

## Error Responses

<ResponseField name="401" type="error">
  Unauthorized - invalid or missing authentication token.
</ResponseField>

<ResponseField name="404" type="error">
  Not Found - runner with the specified ID does not exist or does not belong to your account.
</ResponseField>

<ResponseField name="500" type="error">
  Internal Server Error - unable to connect to the runner or send interrupt signal.

  Common causes:

  * Runner endpoint is unreachable
  * Runner is offline or not responding
  * Network connectivity issues
  * Invalid authentication headers configured for the runner
</ResponseField>

## Notes

* This endpoint makes a live request to your ComfyUI instance
* The interrupt is sent immediately to the runner
* Any currently executing workflow will be stopped
* The workflow status may change to `cancelled` or `failed` depending on the execution state
* Use this sparingly as it forcefully stops execution
* Consider using the workflow cancel endpoint for graceful cancellation when possible
* Response time depends on network latency to your runner