Safari Screenshot

View original on GitHub 

A Node.js MCP Server for capturing screenshots using Safari on macOS.

Features

• Capture window screenshots at specific sizes
• Support for different zoom levels
• Configurable wait times for page load
• Clean up after capture
• Native macOS screenshot quality

Usage

import { takeScreenshot } from './screenshot.js';
 
// Basic window screenshot
await takeScreenshot({
	url: 'https://www.apple.com',
	outputPath: './screenshot.png',
	width: 1024, // Optional: window width (default: 1024)
	height: 768, // Optional: window height (default: 768)
	waitTime: 3, // Optional: seconds to wait for load (default: 3)
	zoomLevel: 1, // Optional: page zoom level (default: 1)
});
 
// Responsive design testing
await takeScreenshot({
	url: 'https://www.apple.com',
	outputPath: './mobile.png',
	width: 375, // iPhone SE width
	height: 667, // iPhone SE height
	zoomLevel: 1,
});
 
// High-resolution capture
await takeScreenshot({
	url: 'https://www.apple.com',
	outputPath: './desktop-hd.png',
	width: 1920, // Full HD width
	height: 1080, // Full HD height
	waitTime: 5, // Wait longer for HD content
	zoomLevel: 0.8, // Zoom out slightly
});

Requirements

• macOS
• Safari
• Node.js >= 14.0.0
• Terminal needs Accessibility permissions (System Preferences → Security & Privacy → Privacy → Accessibility)

Installation

npm install safari-screenshot

Options

Common Viewport Sizes

The module is tested with these common viewport sizes:

• Desktop: 1920×1080 (Full HD)
• Laptop: 1366×768
• Tablet Landscape: 1024×768
• Tablet Portrait: 768×1024
• Mobile Large: 428×926 (iPhone 12 Pro Max)
• Mobile Medium: 390×844 (iPhone 12 Pro)
• Mobile Small: 375×667 (iPhone SE)

How It Works

1. Opens Safari with specified window size
2. Loads the URL and waits for page load
3. Applies zoom level if specified
4. Uses native macOS screencapture for pixel-perfect results
5. Verifies screenshot was captured successfully
6. Cleans up Safari windows

Permissions

This package requires System Events permissions to work:

1. Open System Preferences > Security & Privacy > Privacy > Accessibility
2. Add Terminal (or your IDE) to the list of allowed apps

Using with Cursor

Setup in Cursor

1. Open Cursor

2. Go to settings, “Add MCP Server”

3. In the configuration dialog:

   • Name: safari-screenshot
   • Type: command
   • Command: npx -y @rogerheykoop/mcp-safari-screenshot

   Or for local development:

   • Command: npx -y /path/to/mcp-safari-screenshot/server.js

Example Commands

After connecting to the server in Cursor, you can use these commands:

Take a screenshot of https://apple.com at desktop size

Response: Will capture at 1920×1080

Capture https://apple.com on iPhone 12 Pro

Response: Will capture at 390×844

Screenshot github.com at 50% zoom

Response: Will capture with zoomLevel: 0.5

Supported Parameters

The MCP server understands these concepts:

• Device names (e.g., “iPhone”, “iPad”, “desktop”)
• Dimensions (e.g., “1024x768”)
• Zoom levels (e.g., “50% zoom”, “2x zoom”)
• Wait times (e.g., “wait 5 seconds”)

Example Workflows

1. Responsive Testing

   Take screenshots of apple.com on iPhone, iPad, and desktop

2. Zoom Testing

   Capture github.com at 75% zoom and 125% zoom

3. Custom Size

   Screenshot example.com at 1440x900

Tips

• Screenshots are saved to the screenshots directory by default
• Device names automatically set appropriate dimensions
• The server handles cleanup of Safari windows
• Use “wait X seconds” for slow-loading pages

Troubleshooting

If you encounter issues:

1. Check Terminal has Accessibility permissions
2. Verify Safari is not in private browsing mode
3. Ensure the working directory is writable
4. Check Cursor’s console for error messages

License

MIT

Testing Locally

You can test the MCP implementation directly:

# Test discovery
echo '{"type":"discover"}' | npx -y ./server.js
 
# Test screenshot
echo '{"type":"execute","tool":"take_screenshot","input":"Take a screenshot of https://apple.com","requestId":"123"}' | npx -y ./server.js

Expected responses:

1. Discover will return capabilities
2. Execute will:
   • Log progress to stderr
   • Return result JSON to stdout
   • Save screenshot to ./screenshots/