Widget UI

@superlayzer/widget-ui is a design system for building widgets that run inside Layzer's MCP App sandbox. It provides Tailwind 4 design tokens, a curated React component library, and utilities optimized for consistent in-iframe widget experiences.

This package is a fork of @openai/apps-sdk-ui, maintained by Layzer to track upstream while shipping Layzer-specific defaults. See UPSTREAM.md for the sync workflow and NOTICE for attribution.

Features

• Design tokens for colors, typography, spacing, sizing, shadows, surfaces, and more.
• Tailwind 4 integration pre-configured with Widget UI's design tokens.
• Accessible components, built on Radix primitives with consistent styling.
• Utilities for dark mode, responsive layouts, and iframe-friendly behaviors.
• Minimal boilerplate — import styles, wrap with a provider, start building.

Prerequisites

Widget UI requires React 19 and Tailwind 4.

• React: https://react.dev/learn/installation
• Tailwind 4: https://tailwindcss.com/docs/installation

Installation

1. Install the package

npm install @superlayzer/widget-ui

2. Setup styles

Add the foundation styles and Tailwind layers to the top of your global stylesheet (e.g. main.css):

@import "tailwindcss";
@import "@superlayzer/widget-ui/css";
/* Required for Tailwind to find class references in Widget UI components. */
@source "../node_modules/@superlayzer/widget-ui";

/* The rest of your widget CSS */

Then import your stylesheet before rendering any components:

// Must be imported first to ensure Tailwind layers and style foundations are defined before any potential component styles
import "./main.css"

import { StrictMode } from "react"
import { createRoot } from "react-dom/client"
import { App } from "./App"

createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <App />
  </StrictMode>,
)

3. Configure router (optional)

<WidgetUIProvider> helps define your default router link component, used in components like <TextLink> and <ButtonLink>.

This provider is optional — router links can also be passed directly to components via the as prop.

// Must be imported first to ensure Tailwind layers and style foundations are defined before component styles
import "./main.css"

import { WidgetUIProvider } from "@superlayzer/widget-ui/components/WidgetUIProvider"
import { StrictMode } from "react"
import { createRoot } from "react-dom/client"
import { Link } from "react-router"
import { App } from "./App"

declare global {
  interface WidgetUIConfig {
    LinkComponent: typeof Link
  }
}

createRoot(document.getElementById("root")!).render(
  <StrictMode>
    <WidgetUIProvider linkComponent={Link}>
      <App />
    </WidgetUIProvider>
  </StrictMode>,
)

Start building

Your widget is now ready to use Widget UI!

Here's an example of a simple reservation card, using Tailwind classes and components.

import { Badge } from "@superlayzer/widget-ui/components/Badge"
import { Button } from "@superlayzer/widget-ui/components/Button"
import { Calendar, Invoice, Maps, Members, Phone } from "@superlayzer/widget-ui/components/Icon"

export function ReservationCard() {
  return (
    <div className="w-full max-w-sm rounded-2xl border border-default bg-surface shadow-lg p-4">
      <div className="flex items-start justify-between gap-3">
        <div>
          <p className="text-secondary text-sm">Reservation</p>
          <h2 className="mt-1 heading-lg">La Luna Bistro</h2>
        </div>
        <Badge color="success">Confirmed</Badge>
      </div>
      <div>
        <dl className="mt-4 grid grid-cols-[auto_1fr] gap-x-3 gap-y-2 text-sm">
          <dt className="flex items-center gap-1.5 font-medium text-secondary">
            <Calendar className="size-4" />
            Date
          </dt>
          <dd className="text-right">Apr 12 · 7:30 PM</dd>
          <dt className="flex items-center gap-1.5 font-medium text-secondary">
            <Members className="size-4" />
            Guests
          </dt>
          <dd className="text-right">Party of 2</dd>
          <dt className="flex items-center gap-1.5 font-medium text-secondary">
            <Invoice className="size-4" />
            Reference
          </dt>
          <dd className="text-right uppercase">4F9Q2K</dd>
        </dl>
      </div>
      <div className="mt-4 grid gap-3 border-t border-subtle pt-4 sm:grid-cols-2">
        <Button variant="soft" color="secondary" block>
          <Phone />
          Call
        </Button>
        <Button color="primary" block>
          <Maps />
          Directions
        </Button>
      </div>
    </div>
  )
}

Upstream

This package tracks openai/apps-sdk-ui. To merge upstream updates, see UPSTREAM.md.

License

MIT © OpenAI (upstream) and Layzer (fork modifications). See NOTICE for attribution details.