google-labs-code · davideast · Apr 4, 2026
diff --git a/packages/sdk/README.md b/packages/sdk/README.md
@@ -110,6 +110,10 @@ await client.close();
 
 The client auto-connects on the first `callTool` or `listTools` call. No explicit `connect()` needed.
 
+## Examples
+
+- [Vite + Tailwind v4 Preview App](examples/vite-preview/README.md): Teaches an agent how to convert Stitch designs to Vite + React apps using Tailwind v4.
+
 ## API Reference
 
 ### `Stitch`

diff --git a/packages/sdk/examples/vite-preview/README.md b/packages/sdk/examples/vite-preview/README.md
@@ -0,0 +1,33 @@
+# Vite + Tailwind v4 Preview App Skill
+
+This directory contains an Agent Skill that teaches an AI agent how to integrate a UI design generated by the Stitch SDK into a Vite + React application using Tailwind CSS v4.
+
+## Overview
+
+Stitch generates designs using a CDN version of Tailwind with custom theme configurations embedded in a `<script id="tailwind-config">` tag. Modern frontend development (like Vite) uses build-time Tailwind CSS (version 4 utilizes an `@theme` CSS block rather than a `tailwind.config.js` file).
+
+This skill provides:
+1.  **`SKILL.md`**: Instructions for an agent on how to scaffold a Vite app, configure Tailwind v4, and map the Stitch HTML and Google Fonts into the application.
+2.  **`scripts/extract-theme.ts`**: A utility script that parses the Stitch HTML output, extracts the embedded configuration, and converts it into Tailwind v4 `@theme` CSS variables.
+
+## Usage
+
+Agents can read `SKILL.md` to learn how to perform the translation and utilize the `extract-theme.ts` script.
+
+To manually run the theme extractor:
+
+```bash
+# Extract the theme from a saved HTML file
+bun run scripts/extract-theme.ts path/to/stitch-output.html
+```
+
+The output will be a CSS block like:
+
+```css
+@theme {
+  --color-primary: #3b82f6;
+  --font-sans: "Inter", sans-serif;
+}
+```
+
+This can be prepended to the Vite app's `index.css` alongside `@import "tailwindcss";`.
diff --git a/packages/sdk/examples/vite-preview/SKILL.md b/packages/sdk/examples/vite-preview/SKILL.md
@@ -0,0 +1,40 @@
+# Skill: Vite + Tailwind v4 Preview App
+
+This skill teaches how to convert Stitch's CDN Tailwind config to Tailwind v4 `@theme` syntax and set up a Vite preview app.
+
+## Capabilities
+
+1.  **Extract Theme:** Use the provided script to extract the embedded Tailwind configuration from a Stitch HTML file and convert it to a Tailwind v4 `@theme` CSS block.
+2.  **Scaffold App:** Set up a Vite project with React and `@tailwindcss/vite`.
+3.  **Integrate Design:** Take the HTML body and Google Fonts links from Stitch and put them into the React app.
+
+## Using the Theme Extractor
+
+To extract the theme from an HTML string or file:
+
+```bash
+bun run scripts/extract-theme.ts "path/to/stitch-output.html" > src/theme.css
+```
+
+This takes the `tailwind.config` JSON-like object from the HTML and converts fields like `theme.extend.colors` into `@theme { --color-*: *; }` variables for Tailwind v4.
+
+## Manual Steps (for an Agent)
+
+1.  Generate a design with Stitch and download the HTML.
+2.  Initialize Vite: `bun create vite my-preview --template react-ts`
+3.  Install Tailwind v4: `cd my-preview && bun add tailwindcss @tailwindcss/vite`
+4.  Configure `vite.config.ts`:
+    ```ts
+    import { defineConfig } from 'vite'
+    import react from '@vitejs/plugin-react'
+    import tailwindcss from '@tailwindcss/vite'
+
+    export default defineConfig({
+      plugins: [tailwindcss(), react()],
+    })
+    ```
+5.  Extract the theme from the HTML using the script in `scripts/extract-theme.ts` and save it to `src/index.css`.
+6.  Prepend `@import "tailwindcss";` to the top of `src/index.css`.
+7.  Copy the `<body>` content from the Stitch HTML into `src/App.tsx`, converting it to JSX (e.g., `class` -> `className`, closing self-closing tags).
+8.  Copy the Google Fonts `<link>` tags from the Stitch HTML `<head>` into `index.html`.
+9.  Run the app: `bun run dev`
diff --git a/packages/sdk/examples/vite-preview/scripts/extract-theme.ts b/packages/sdk/examples/vite-preview/scripts/extract-theme.ts
@@ -0,0 +1,72 @@
+import * as fs from "fs";
+
+/**
+ * Extracts a Tailwind v3 config from Stitch HTML and converts it to Tailwind v4 @theme CSS.
+ */
+function extractTheme(htmlPath: string): string {
+  const html = fs.readFileSync(htmlPath, "utf-8");
+  const configMatch = html.match(/<script id="tailwind-config">([\s\S]*?)<\/script>/);
+
+  if (!configMatch) {
+    console.error("No tailwind-config script found in the HTML.");
+    process.exit(1);
+  }
+
+  const scriptContent = configMatch[1];
+  const configObjMatch = scriptContent.match(/tailwind\.config\s*=\s*({[\s\S]*?});/);
+
+  if (!configObjMatch) {
+    console.error("Could not parse tailwind.config object.");
+    process.exit(1);
+  }
+
+  let config: any;
+  try {
+    // The config is a JS object literal, not strict JSON. Use a safe eval-like approach or relaxed parser.
+    // For simplicity in this example, we'll try evaluating it in a sandbox or cleaning it up.
+    // Since it's from a trusted source (Stitch), eval is a quick way to parse JS object literals.
+    config = new Function(`return ${configObjMatch[1]}`)();
+  } catch (e) {
+    console.error("Failed to parse tailwind config:", e);
+    process.exit(1);
+  }
+
+  let themeCss = "@theme {\n";
+
+  if (config?.theme?.extend?.colors) {
+    for (const [colorName, colorValue] of Object.entries(config.theme.extend.colors)) {
+      if (typeof colorValue === "string") {
+        themeCss += `  --color-${colorName}: ${colorValue};\n`;
+      } else if (typeof colorValue === "object" && colorValue !== null) {
+         for (const [shade, hex] of Object.entries(colorValue)) {
+            themeCss += `  --color-${colorName}-${shade}: ${hex};\n`;
+         }
+      }
+    }
+  }
+
+  if (config?.theme?.extend?.fontFamily) {
+    for (const [fontName, fontValue] of Object.entries(config.theme.extend.fontFamily)) {
+      if (typeof fontValue === "string") {
+        themeCss += `  --font-${fontName}: ${fontValue};\n`;
+      } else if (Array.isArray(fontValue)) {
+         themeCss += `  --font-${fontName}: ${fontValue.join(", ")};\n`;
+      }
+    }
+  }
+
+  themeCss += "}\n";
+  return themeCss;
+}
+
+if (require.main === module) {
+  const file = process.argv[2];
+  if (!file) {
+    console.error("Usage: bun run extract-theme.ts <path-to-html>");
+    process.exit(1);
+  }
+  const css = extractTheme(file);
+  console.log(css);
+}
+
+export { extractTheme };