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

# Errors

The following table describes the common errors that the APIs can return:

| HTTP | Code                                                    | When it happens                                                                                                                                                                                                      |
| ---- | ------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| 401  | `bad_request`                                           | This can happen for a missing API key: `{"detail": "API key is required"}`, an invalid/expired API key: `{"detail": "Invalid or expired API key"}` or for other auth parsing errors: `{"detail": "<error message>"}` |
| 403  | `forbidden`                                             | API key lacks scope for the path (example: `/v1/contents`): `{"detail": "Missing required scopes"}`                                                                                                                  |
| 404  | `agent_not_found` or `agent_not_supported_yet`          | The agent ID does not exist (or was deleted), or the agent uses an unsupported model/feature                                                                                                                         |
| 500  | `Internal Server Error (auth/authorization middleware)` | This can happen in the case of authentication failure: `{"detail": "Internal authentication error"}` or authorization failure: `{"detail": "Internal authorization error"}`                                          |