{
  "name": "execution.kill",
  "description": "Cancels a running execution by execution ID",
  "signature": {
    "input": {
      "kind": "execution-id",
      "description": "Execution ID to cancel",
      "required": true,
      "mode": "ValueOrExpression"
    },
    "output": {
      "mode": "Value",
      "kind": "boolean",
      "description": "Returns true if the execution was cancelled"
    }
  }
}