Playwright MCP (Microsoft Browser Automation & Live DOM Interaction)

🎯 When to Use

• Interactive Browser Automation: Navigating web pages, clicking buttons, selecting options, typing into inputs, and submitting forms.
• Accessibility Snapshot Navigation: Inspecting web interfaces via structured ARIA/accessibility trees, drastically saving token context compared to full HTML dumps.
• End-to-End (E2E) Test Execution: Validating authentication flows, checkout flows, and user journey funnels.
• Screenshot & Console Capture: Taking targeted viewport screenshots and intercepting browser console logs for live debugging.

🚀 Setup & Registration

MCP Configuration

.mcp.json

{
  "mcpServers": {
    "playwright": {
      "command": "npx",
      "args": ["-y", "@playwright/mcp@latest"]
    }
  }
}

🛠️ Key Capabilities & Tools

• browser_navigate

  : Navigates to any target URL and returns the parsed accessibility tree.

• browser_click

  : Clicks an element identified by its accessibility reference ID.

• browser_type

  : Types text into specified form inputs or content-editable elements.

• browser_screenshot

  : Captures full-page or element-specific screenshots.

• browser_evaluate

  : Evaluates custom JavaScript in the browser execution context.

⚡ Integration with REA & Security Workflows

• Dynamic XSS & CSP Verification: Navigate to test endpoints with live attack payloads to verify if CSP actively blocks script execution or if DOM-based XSS triggers alert dialogs.
• Automated Login & Auth Flow Testing: Automate the multi-step login flow for web applications (Clerk, Supabase, OAuth) to test authenticated routes and cookie security flags.
• E2E Post-Fix Validation: After implementing a security patch or header reconfiguration, run Playwright MCP to verify that the website continues to function seamlessly for real users.