> For the complete documentation index, see [llms.txt](https://docs.vsat.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.vsat.dev/reference/errors.md).

# Errors & retries

Every error is `{ ok:false, code, retryable, error }`. **Retry only when `retryable:true`**: retrying a 4xx caller error just wastes the challenge (single-use and cid-bound).

| code                          | status | retry?  | meaning                                     |
| ----------------------------- | ------ | ------- | ------------------------------------------- |
| `unauthorized`                | 401    | no      | missing/invalid token                       |
| `bad_field` / `missing_field` | 400    | no      | request shape / incoherent input            |
| `bad_json` / `bad_motion`     | 400    | no      | malformed body / drag                       |
| `body_too_large`              | 413    | no      | body over the cap                           |
| `unsupported_challenge`       | 422    | no      | puzzle variant, or Windows slider           |
| `sandbox_error`               | 500    | no      | the challenge script threw during execution |
| `at_capacity` / `no_workers`  | 503    | **yes** | service busy, back off and retry            |
| `draining`                    | 503    | **yes** | instance stopping, try again                |
| `solve_timeout`               | 504    | **yes** | solve exceeded the budget                   |


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