# Overview (/docs/capabilities)

A **capability** describes a feature your addon offers. Mr. Tick reads this information to decide where the addon can be used. For example, a task integration uses `dataSource`, while a visual theme uses `theme`.

List the features in `capabilities` in manifest.yaml. The accepted names are `auth`, `dataSource`, `watcher`, `calendar`, `punch` and `theme`; use their exact spelling. The list must have at least one value and no duplicates. An addon can offer more than one feature.

Use `requiredApiVersion` to declare the compatible application API. Menus, commands and settings are registered by the addon code. To connect external accounts, also declare `auth` and register its profiles and authenticators during activation.

- [Authentication](/docs/capabilities/auth)
- [datasources](/docs/capabilities/datasources)
- [Activity watchers](/docs/capabilities/watchers)
- [calendars](/docs/capabilities/calendars)
- [themes](/docs/capabilities/themes)
- [punch](/docs/capabilities/punch)

See [authentication](/docs/capabilities/auth), [OAuth PKCE](/docs/apis/oauth-pkce) and [vault and events](/docs/apis/vault-and-events).