# Experimental Banner

Renders a callout box identifying a feature or code path as experimental or unstable.

## Surfaces

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

## Fields

| Field | Type |
|---|---|
| message | string. Context or feedback links for the unstable feature. |

## Example payload

```json
{
  "type": "experimental_banner",
  "message": "Your action was completed successfully."
}
```

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