# Conflict
URL: /reference/problems/conflict

The API returns a `409 Conflict` status with this problem type when the request is valid, but cannot be completed because it conflicts with the current state of the resource.

## Response Format

```json
{
  "type": "https://docs.tambo.co/reference/problems/conflict",
  "status": 409,
  "title": "Conflict",
  "detail": "A thread with this context key already exists",
  "instance": "/threads"
}
```

## Fields

* **`type`** - Stable URI identifying this problem type
* **`status`** - HTTP status code (always `409`)
* **`title`** - Short summary of the problem (always `Conflict`)
* **`detail`** - Human-readable description explaining what conflicted
* **`instance`** - The specific request path that triggered this error

## Handling

When you receive this error:

1. Read the `detail` field to understand the conflict
2. Update your request to resolve the conflict (e.g., use a different identifier)
3. Retry the request

## See Also

* [REST API Reference](/reference/rest-api) - Complete API documentation
* [RFC 9457 Problem Details](https://www.rfc-editor.org/rfc/rfc9457.html) - Standard for error responses