> ## Documentation Index
> Fetch the complete documentation index at: https://getcomposer.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Desktop app

> The Composer desktop application surface.

The desktop app is the primary Composer workspace. It provides the thread UI, runtime controls, provider selection, file previews, and project-aware agent sessions.

## Development entry point

Run the desktop workflow from the repository root:

```bash theme={null}
npm run dev:desktop
```

## Source layout

* `apps/desktop/src` contains the React application.
* `apps/desktop/electron` contains the Electron main process code.
* `apps/desktop/server` contains the desktop-local server runtime.
* `packages/composer-runtime` contains runtime code shared by the CLI and desktop app.

## Related pages

* [Quickstart](/quickstart)
* [Agent handoffs](/concepts/handoffs)