ComfyUI MCP Server

Instructions

    Args:
        prompt_id: Optional specific prompt ID to cancel.
                  If not provided, cancels all running jobs.

    Use this to stop a long-running generation.
    

Implementation Reference

• src/comfy_mcp_server/tools/system.py:80-100 (handler)

  The handler function implementing the 'cancel_current' tool logic. It optionally takes a prompt_id and sends a POST request to ComfyUI's /interrupt endpoint to cancel running jobs. Includes inline schema via Pydantic Field and is registered via @mcp.tool() decorator.

  @mcp.tool()
  def cancel_current(
      prompt_id: str = Field(default=None, description="Specific prompt ID to cancel"),
      ctx: Context = None,
  ) -> str:
      """Interrupt current generation.
  
      Args:
          prompt_id: Optional specific prompt ID to cancel.
                    If not provided, cancels all running jobs.
  
      Use this to stop a long-running generation.
      """
      if ctx:
          msg = f"Cancelling prompt {prompt_id}" if prompt_id else "Cancelling all"
          ctx.info(msg)
  
      data = {"prompt_id": prompt_id} if prompt_id else {}
      status, _ = comfy_post("/interrupt", data)
      return "Interrupted successfully" if status == 200 else "Interrupt failed"