A prominent banner displaying a message, often with an icon and an
| Surface | Note |
|---|---|
| google-chat | Renders as a basic card with text and button; no custom icons, complex layouts, or animations. |
| Field | Type | |
|---|---|---|
| text | string. The banner message. NOT `message` — every renderer reads `text`, so a banner built with `message` renders empty apart from its icon. | required |
| variant | string. Severity — "info", "success", "warning" or "critical". "error" is accepted as a synonym for "critical": inline_alert knows the first word and this atom the second, and each used to fall back silently to "info" on the other. NOT `type`, which is the block discriminator. | required |
| icon | string Optional icon name to display next to the message. | optional |
| action_label | string Optional text for an action button. | optional |
| action_url | string Optional URL for the action button. | optional |
{
"type": "alert_banner",
"text": "A concise description of the content.",
"variant": "primary"
}{
"identifier": "urn:air:a2uicatalog.ai:atom:alert_banner",
"displayName": "Alert Banner",
"type": "application/vnd.a2ui.atom+json",
"url": "https://a2uicatalog.ai/atoms/alert_banner",
"capabilities": [
"web",
"google-meet-stage",
"google-apps-script-web",
"mcp-apps"
],
"description": "A prominent banner displaying a message, often with an icon and an",
"representativeQueries": [
"show a full-width status alert strip optional action",
"a prominent banner displaying a message, often with an icon and an",
"render a alert banner"
]
}The renderer is an open-source Google Apps Script web app. Deploy your own instance in 4 commands — you own the URL, no dependency on the demo endpoint.
git clone https://github.com/a2uicatalog/a2ui
cd a2ui/apps-script-surface/gas-wired-renderer
clasp push && clasp deploy