# Gallery

Responsive image grid with CSS-only lightbox on click

## Surfaces

web, google-apps-script-web, mcp-apps

## Fields

| Field | Type |
|---|---|
| cols | 2 | 3 | 4 (optional, default 3) |
| caption | string (optional) |
| images | [{'url': 'string', 'alt': 'string', 'caption': 'string (optional)'}] |

## Example payload

```json
{
  "type": "gallery"
}
```

Live page: https://a2uicatalog.ai/atoms/gallery/
Full field contract: https://a2uicatalog.ai/spec.json