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

# Error Codes

> Error Codes for CometChat REST API.

Error codes specific to the BYO Agent APIs.

## Agent Errors

| Error Code                  | Description                                |
| --------------------------- | ------------------------------------------ |
| `ERR_AGENT_NOT_FOUND`       | No BYO agent exists with the specified ID. |
| `ERR_AGENT_CREATION_FAILED` | Failed to create the BYO agent.            |

## Tool Errors

| Error Code           | Description                           |
| -------------------- | ------------------------------------- |
| `ERR_TOOL_NOT_FOUND` | No tool exists with the specified ID. |

## Authentication Errors

| Error Code                  | Description                                      |
| --------------------------- | ------------------------------------------------ |
| `AUTH_ERR_EMPTY_APIKEY`     | The `apikey` header is missing from the request. |
| `AUTH_ERR_APIKEY_NOT_FOUND` | The provided API key is invalid.                 |
| `AUTH_ERR_NO_ACCESS`        | The API key doesn't have the required scope.     |