Add Stagehand Guide (#56)

Added stagehand integration guide.

Author: dprevoznik

docs.json

@@ -83,6 +83,7 @@
             "pages": [
               "integrations/browser-use",
               "integrations/magnitude",
+              "integrations/stagehand",
               "integrations/valtown",
               "integrations/vercel"
             ]

integrations/stagehand.mdx

@@ -0,0 +1,103 @@
+---
+title: "Stagehand"
+---
+
+[Stagehand](https://github.com/browserbase/stagehand) is an open source AI browser automation framework. It lets developers choose what to write in code vs. natural language. By integrating with Kernel, you can run Stagehand automations with cloud-hosted browsers.
+
+## Adding Kernel to existing Stagehand implementations
+
+If you already have a Stagehand implementation, you can easily switch to using Kernel's cloud browsers by updating your browser configuration.
+
+### 1. Install the Kernel SDK
+
+```bash
+npm install @onkernel/sdk
+```
+
+### 2. Initialize Kernel and create a browser
+
+Import the libraries and create a cloud browser session:
+
+```typescript
+import { Stagehand } from "@browserbasehq/stagehand";
+import Kernel from '@onkernel/sdk';
+import { z } from "zod";
+
+const client = new Kernel({
+  apiKey: process.env.KERNEL_API_KEY
+});
+
+const kernelBrowser = await client.browsers.create({ stealth: true });
+
+console.log("Live view url: ", kernelBrowser.browser_live_view_url);
+```
+
+### 3. Update your browser configuration
+
+Replace your existing browser setup to use Kernel's CDP URL:
+
+```typescript
+const stagehand = new Stagehand({
+  env: 'LOCAL',
+  verbose: 1,
+  domSettleTimeoutMs: 30_000,
+  modelName: 'openai/gpt-4.1',
+  modelClientOptions: {
+    apiKey: process.env.OPENAI_API_KEY
+  },
+  localBrowserLaunchOptions: {
+    cdpUrl: kernelBrowser.cdp_ws_url
+  }
+});
+
+await stagehand.init();
+```
+
+### 4. Use your Stagehand automation
+
+Use Stagehand's page methods with the Kernel-powered browser:
+
+```typescript
+const page = stagehand.page;
+await page.goto("https://onkernel.com");
+await page.act("Click on Blog in the navbar");
+await page.act("Click on the newest blog post");
+const output = await page.extract({
+  instruction: "Extract a summary of the blog post",
+  schema: z.object({ summary: z.string() })
+});
+
+console.log("Newest blog post summary: ", output.summary);
+
+await stagehand.close();
+
+// Clean up the Kernel Browser Session
+await client.browsers.deleteByID(kernelBrowser.session_id);
+```
+
+## Quick setup with our Stagehand example app
+
+Alternatively, you can use our Kernel app template that includes a pre-configured Stagehand integration:
+
+```bash
+npx @onkernel/create-kernel-app my-stagehand-app
+```
+
+Choose `TypeScript` as the programming language and then select `Stagehand` as the template.
+
+Then follow the [Quickstart guide](/quickstart/) to deploy and run your Stagehand automation on Kernel's infrastructure.
+
+## Benefits of using Kernel with Stagehand
+
+- **No local browser management**: Run automations without installing or maintaining browsers locally
+- **Scalability**: Launch multiple browser sessions in parallel
+- **Stealth mode**: Built-in anti-detection features for web scraping
+- **Session persistence**: Maintain browser state across automation runs
+- **Live view**: Debug your automations with real-time browser viewing
+
+## Next steps
+
+- Check out [live view](/browsers/live-view) for debugging your automations
+- Learn about [stealth mode](/browsers/stealth) for avoiding detection
+- Learn how to properly [terminate browser sessions](/browsers/termination)
+- Learn how to [deploy](/apps/deploy) your Stagehand app to Kernel