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

# POST Rerun a runner run

> Replay a run from its saved TestConfig

```bash theme={null}
POST /runner/runs/{run_id}/rerun
```

Creates a new runner run from a previous run's `test_config_json`. You can rerun against the original URL, override `start_url`, or attach the rerun to a ready sandbox with `sandbox_id`. If the sandbox is not ready, the API returns `409`.

**Request body**

| Field        | Type     | Required | Description                                                                                           |
| ------------ | -------- | -------- | ----------------------------------------------------------------------------------------------------- |
| `prompt`     | `string` | No       | Override the prompt.                                                                                  |
| `start_url`  | `string` | No       | Override the starting URL.                                                                            |
| `sandbox_id` | `string` | No       | Ready sandbox to rerun against. When present and `start_url` is omitted, the sandbox app URL is used. |