> For the complete documentation index, see [llms.txt](https://docs.drizz.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.drizz.dev/twins/available-twins.md).

# Available twins

The products you can test your agent against today.

Each twin is a private copy of a real product. Your agent reaches it over MCP, the same way it would reach the real one.

|                                                           |                                                                                 |
| --------------------------------------------------------- | ------------------------------------------------------------------------------- |
| [**Google Calendar**](/twins/available-twins/calendar.md) | Events, recurring events, attendees, other calendars and sharing                |
| [**Gmail**](/twins/available-twins/gmail.md)              | Messages, threads, labels, drafts, and mail that arrives while your agent works |

Run `twin --list` to see the twins your account can use.

## Next

* [Google Calendar](/twins/available-twins/calendar.md): what the calendar twin covers and how to seed it.
* [Gmail](/twins/available-twins/gmail.md): what the Gmail twin covers and how to seed a mailbox.
* [Describe a world](/twins/using-twins/describe-a-world.md): the full seed file syntax.

***

*Last updated: 27 October 2026*