# Delete a thread (/docs/api-reference/inboxes/delete-inbox-thread)

Removes the conversation from the inbox. Its received emails and emails stay in the environment until their retention ends; a later reply starts a new thread.

`DELETE https://api.coss.com/v1/inboxes/{inbox_id}/threads/{thread_id}`

Authenticate with your API key as a bearer token (`Authorization: Bearer coss_test_…`). Responses are JSON with snake_case fields; errors are `{ error: { type, code, message, param?, issues?, request_id } }` (https://coss.com/docs/api-reference/errors.md).

## Path parameters

- `inbox_id` (string, required): The inbox's id.
- `thread_id` (string, required): The thread's id.

## Example request

TypeScript (the `coss` package):

```ts
import { Coss } from "coss";

const coss = new Coss({
  apiKey: process.env.COSS_API_KEY,
  baseUrl: "https://api.coss.com",
});

const { data, error } = await coss.inboxes.threads.delete("inbox_01k7c8m4q2f3e9v6t5r1n0p8yz", "thread_01k7c8m4r0c2b8w9y3d5f6g7h8");
```

HTTP:

```sh
curl -X DELETE "https://api.coss.com/v1/inboxes/inbox_01k7c8m4q2f3e9v6t5r1n0p8yz/threads/thread_01k7c8m4r0c2b8w9y3d5f6g7h8" \
  -H "Authorization: Bearer $COSS_API_KEY"
```

## Response 200

The thread was deleted.

- `object` ("inbox_thread", required)
- `id` (string, required)
- `deleted` (true, required)

Example:

```json
{
  "object": "inbox_thread",
  "id": "thread_01k7c8m4r0c2b8w9y3d5f6g7h8",
  "deleted": true
}
```

## Errors

- `400`: The `Coss-Version` header names an unknown API version (`invalid_api_version`).
- `401`: The API key is missing, invalid, revoked or expired (`authentication_error`).
- `403`: The API key lacks the permission this endpoint needs (`permission_error`), or its organization is suspended (`organization_suspended`).
- `404`: No such inbox or thread in this environment (`not_found`).
- `429`: Too many requests with this API key (`rate_limited`), or too many requests with invalid keys from this address (`too_many_failed_authentications`). Retry after `Retry-After` seconds. Successful responses carry `RateLimit-Limit`, `RateLimit-Remaining` and `RateLimit-Reset` (seconds until the limit is fully restored).
- `500`: Unexpected server error (`api_error` / `internal_error`).
- `503`: The API key could not be verified right now; retry (`service_unavailable`).