> For the complete documentation index, see [llms.txt](https://swallow-1.gitbook.io/swallow/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swallow-1.gitbook.io/swallow/developer-api/errors-codes.md).

# Errors codes

Swallow uses conventional HTTP response codes to indicate the success or failure of an API request. In general: Codes in the `2xx` range indicate success. Codes in the `4xx` range indicate an error that failed given the information provided. Codes in the `5xx` range indicate an error with Swallow's servers - these are uncommon.

| Code                        | Meaning                                                |
| --------------------------- | ------------------------------------------------------ |
| **200** - Ok                | Everything worked                                      |
| **400** - Bad Request       | Request was rejected. Check the parameters of request. |
| **401** - Unauthorised      | No valid API keys                                      |
| **403** - Forbidden         | API key is not permissioned                            |
| **404** - Not Found         | The requested resource doesn't exist                   |
| **429** - Too many requests | Too many requests hit the API                          |
| **500** - Server error      | Error within Swallow servers                           |

**Example** 

```
{
    "message": "project_name has already been used",
    "status_code": 400
}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://swallow-1.gitbook.io/swallow/developer-api/errors-codes.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.