> ## Documentation Index
> Fetch the complete documentation index at: https://cortex-foundation-add13747-droid-2a5c5e50-docs-ferndesk-pro.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# bad_request

> Bad request. HTTP 400.

|           |                                                       |
| --------- | ----------------------------------------------------- |
| HTTP      | `400`                                                 |
| `code`    | `bad_request`                                         |
| `type`    | `https://docs.cortex.foundation/problems/bad_request` |
| Retryable | no                                                    |

Syntactically valid but semantically impossible — for example a cursor that decodes but points at a different conversation.

```json theme={null}
{
  "type": "https://docs.cortex.foundation/problems/bad_request",
  "title": "Bad request",
  "status": 400,
  "code": "bad_request",
  "request_id": "req_…"
}
```

## Related

* [Errors](/api/errors) — how to branch on `code`, and what not to render from `detail`.
* [Problem catalog](/problems) — every code, its status, and whether retrying helps.
* [Troubleshooting](/getting-started/troubleshooting) — what a message in the product means.