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

# Developing Addons

> How to develop addon packages that extend the Lunar admin panel.

When creating addon packages for Lunar, new screens and functionality can be added to the admin panel by creating a Filament plugin. With Filament plugins, additional resources, pages, and widgets can be registered. See the [Filament documentation](https://filamentphp.com/docs) for more information on building plugins.

## Registering Filament Plugins

Addon packages should not auto-register Filament plugins in the Lunar panel. Instead, provide installation instructions so that developers can register the plugin manually in their service provider.

Below is an example of how a plugin should be registered:

```php theme={null}
use Lunar\Admin\Support\Facades\LunarPanel;

LunarPanel::panel(fn ($panel) => $panel->plugin(new ReviewsPlugin()))
    ->register();
```

<Info>
  When extending forms or tables in an addon, use a defensive approach since the form contents may have been modified by other extensions. See [Extending Pages in Addons](/1.x/admin/extending/pages#extending-pages-in-addons) for more details.
</Info>