# Extensions

An extension is a small program that adds a capability to Cowork, for example a connection to an outside chat channel.

## When to use it

When you want to add a capability to Cowork that comes as an extension, such as a new message channel.

## How to use it

Open **Settings › Extensions**:

1. **Install from folder** — choose the extension's folder; it is copied into Cowork.
2. Review it and click **Approve**. Nothing runs before you approve.
3. Switch it on.

- Each extension runs separately from Cowork, so a crash does not take Cowork down.
- **Logs** shows what it is doing. **Uninstall** removes it.
- If its files change, it must be approved again.
- Only you can approve an extension; the AI cannot.