# Alert

A React component in [Beamline](https://beamline.io/)'s [Feedback](https://beamline.io/components/feedback) category, in the free sample. Live demo: https://beamline.io/components/alert

A message that stays until it is dealt with: what happened, what to do, an action; danger and warning are announced; dismissing folds its height away.

## Use it for

- Persistent problems or notices on a page: failing webhook, expiring card, maintenance.

## Not for

- Brief results of an action ([toast](https://beamline.io/components/toast)).
- Field errors (under the field).

## Anatomy

- wrap (folds on dismiss)
- alert (m-surface; tone tint composed over the role's fill)
- icon (tone colour)
- title
- body
- actions
- dismiss (ghost icon Button sm)

## States

- shown
- folding away

## Keyboard

- Dismiss is a button

## Motion

Dismiss folds the height to zero and fades over --pui-duration-standard, then unmounts; reduced motion is instant. Nothing moves at rest.

## Props

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `tone` | `"info" \| "success" \| "warning" \| "danger" \| "neutral"` | — |  |
| `title / children / action` | `ReactNode` | — |  |
| `icon` | `ReactNode \| false` | — |  |
| `open / onDismiss` | `boolean / () => void` | — |  |
| `style / ref` | `CSSProperties / native Ref` | — | native HTMLDivElement |
| `classNames` | `AlertClassNames` | — |  |

## Dependencies

`lucide-react`

## Import

```tsx
import { Alert } from "@/components/alert/alert";
```

## Get it

Alert is part of Beamline: 190 React components and screens your coding agent (Claude Code, Codex, Cursor or any MCP client) installs into your app through Beamline's MCP server, as a ready-built package or as plain React source you can change. $49 one payment (regular $200), no subscription, a year of updates, one licence for your whole team. Alert is in the free sample, which costs nothing. [Get Beamline](https://beamline.io/checkout?pack=complete) · [Connect your agent](https://beamline.io/connect)

## More in Feedback

- [Announcement bar](https://beamline.io/components/announcement-bar): A banner across the top for news and offers: messages take turns, a countdown ticks, and dismissing folds it away and can remember it.
- [Empty state](https://beamline.io/components/empty-state): What a place will hold and the first step to fill it, instead of a blank; a compact size for panels and filtered tables.
- [Notification centre](https://beamline.io/components/notification-center): Updates that wait to be read: a bell with the unread count opens All / Unread, new and earlier groups, and per item mark read or dismiss.
- [Progress](https://beamline.io/components/progress): How much of a known task is done, or a moving bar when the length is unknown, with an optional label and value.
- [Skeleton](https://beamline.io/components/skeleton): Holds the shape of content while it loads, then crossfades into it, so nothing jumps.
- [Spinner](https://beamline.io/components/spinner): A ring that spins while work runs and closes into a drawn check or cross when it ends.
- [Usage meter](https://beamline.io/components/usage-meter): An allowance and what fills it: one bar split by source, the room left, a warning near the limit and the overflow in its own red well past a notch at the…