feat: add web_browse tool for navigating and interacting with web pages using Bun's WebView

docs/webview.md

@@ -0,0 +1,83 @@
+# WebView Tool (web_browse)
+
+A built-in browser tool powered by Bun's native WebView. No Puppeteer, no Playwright,
+no separate browser download — just the runtime's own headless browser.
+
+## What it does
+
+- **Navigate** to any URL and extract text/HTML after JS execution
+- **Click** buttons, links, and interactive elements
+- **Type** into input fields and forms
+- **Scroll** to elements on the page
+- **Screenshot** pages as PNG files
+- **Evaluate** arbitrary JavaScript in the page context
+
+## When to use it
+
+Use `web_browse` instead of `web_fetch` when:
+
+- The page is a SPA (Single Page Application) that needs JavaScript
+- You need to interact with the page (click, type, scroll)
+- You need a visual screenshot of the page
+- `web_fetch` returns incomplete or empty content
+- You need to fill forms or submit data
+
+Use `web_fetch` when:
+
+- The page is static HTML
+- You just need the text content quickly
+- No JS execution is needed
+
+## Actions
+
+| Action | Description | Requires |
+|--------|-------------|----------|
+| `text` | Page text content after JS execution | — |
+| `html` | Raw HTML of the page | — |
+| `screenshot` | Save page as PNG, return file path | — |
+| `evaluate` | Run JavaScript, return result | `script` |
+| `click` | Click an element | `selector` |
+| `type` | Type text into an input | `selector` + `text` |
+| `scroll` | Scroll to an element | `selector` |
+
+## Examples
+
+```json
+// Get page text
+{ "url": "https://example.com", "action": "text" }
+
+// Take a screenshot
+{ "url": "https://example.com", "action": "screenshot" }
+
+// Click a button
+{ "url": "https://example.com", "action": "click", "selector": "button.submit" }
+
+// Fill a form
+{ "url": "https://example.com", "action": "type", "selector": "#email", "text": "user@example.com" }
+
+// Run custom JS
+{ "url": "https://example.com", "action": "evaluate", "script": "document.querySelectorAll('a').length" }
+```
+
+## Requirements
+
+- **macOS**: Uses system WKWebView (no install needed)
+- **Linux/Windows**: Requires Chrome, Chromium, Edge, or Brave installed
+- Bun 1.2+ for WebView support
+
+## Tool set
+
+`web_browse` is in the `net` tool set. Enable it in config:
+
+```json
+{ "toolSets": ["core", "git", "net"] }
+```
+
+Or enable all sets with `toolSets: ["*"]`.
+
+## Limitations
+
+- Each call creates a fresh browser instance (no persistent sessions by default)
+- Maximum 15s navigation timeout, 5s action timeout
+- Screenshots are saved to the system temp directory
+- Not available in Bun versions before 1.2