# missing_credentials

> The MCP endpoint was called without a sign-in or an agent key.

Source: https://tickwire.io/docs/errors/missing_credentials/

HTTP 401. Nothing reached the broker.

**Likely causes:**

- The AI app has not signed in with Tickwire yet.
- No `Authorization: Bearer …` header (or `X-Tickwire-Agent-Key`) was sent.

**What to do:** Sign in with Tickwire from the AI app (it follows the `WWW-Authenticate` header in this answer), or send an agent key as `Authorization: Bearer twag_…`.

**Retry:** No. The same request gets the same answer; change something first.

Listed under [Keys, tokens and permissions](https://tickwire.io/docs/errors/#keys-tokens-and-permissions) in [Errors](https://tickwire.io/docs/errors/). Send the error's `requestId` to support and we can find the request.