Playwright: Web Automation via Browser Snapshots

Key Features of Playwright: Web Automation via Browser Snapshots

• Structured Data Interaction: Uses accessibility tree snapshots instead of pixel-based screenshots for accurate element targeting.
• Mode Flexibility: Switch between high-precision Snapshot Mode and visual Vision Mode depending on task requirements.
• Comprehensive Tool Suite: 15+ built-in actions including page manipulation, input simulation, and output generation.
• AI-Ready Integration: Exports snapshot data in machine-readable formats for seamless use with LLMs and automation pipelines.

Use Cases of Playwright: Web Automation via Browser Snapshots

Common applications include:

• Automated end-to-end testing of dynamic web applications
• Generating audit-ready PDF reports from web content
• Integrating visual verification into CI/CD pipelines
• Executing cross-browser compatibility checks
• Automating repetitive administrative tasks in web interfaces

FAQ from Playwright: Web Automation via Browser Snapshots

What makes Snapshot Mode better than traditional automation?

It eliminates visual flakiness by interacting with semantic element structures instead of pixel positions.

How do I choose between Snapshot and Vision Mode?

Use Snapshot for structured tasks like form filling. Use Vision for CAPTCHA handling or layout validation requiring pixel analysis.

Does it support headless execution?

Yes, all operations can run without visible browser windows for server-side automation.

Can I customize the automation workflows?

Yes, through JSON/YAML configurations and JavaScript hooks for complex logic implementation.

Which browsers are supported?

Chromium-based browsers (Chrome, Edge), Firefox, and WebKit (Safari).

Playwright MCP

A Model Context Protocol (MCP) server that provides browser automation capabilities using Playwright. This server enables LLMs to interact with web pages through structured accessibility snapshots, bypassing the need for screenshots or visually-tuned models.

Key Features

• Fast and lightweight : Uses Playwright’s accessibility tree, not pixel-based input.
• LLM-friendly : No vision models needed, operates purely on structured data.
• Deterministic tool application : Avoids ambiguity common with screenshot-based approaches.

Use Cases

• Web navigation and form-filling
• Data extraction from structured content
• Automated testing driven by LLMs
• General-purpose browser interaction for agents

Example config

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

Running headless browser (Browser without GUI).

This mode is useful for background or batch operations.

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

Running headed browser on Linux w/o DISPLAY

When running headed browser on system w/o display or from worker processes of the IDEs, you can run Playwright in a client-server manner. You'll run the Playwright server from environment with the DISPLAY

npx playwright run-server

And then in MCP config, add following to the env:

{
  "mcpServers": {
    "playwright": {
      "command": "npx",
      "args": [
        "@playwright/mcp@latest"
      ],
      "env": {
        // Use the endpoint from the output of the server above.
        "PLAYWRIGHT_WS_ENDPOINT": "ws://localhost:<port>/"
      }
    }
  }
}

Tool Modes

The tools are available in two modes:

1. Snapshot Mode (default): Uses accessibility snapshots for better performance and reliability
2. Vision Mode : Uses screenshots for visual-based interactions

To use Vision Mode, add the --vision flag when starting the server:

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

Vision Mode works best with the computer use models that are able to interact with elements using X Y coordinate space, based on the provided screenshot.

Snapshot Mode

The Playwright MCP provides a set of tools for browser automation. Here are all available tools:

• browser_navigate

  • Description: Navigate to a URL
  • Parameters:
    • url (string): The URL to navigate to

• browser_go_back

  • Description: Go back to the previous page
  • Parameters: None

• browser_go_forward

  • Description: Go forward to the next page
  • Parameters: None

• browser_click

  • Description: Perform click on a web page
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot

• browser_hover

  • Description: Hover over element on page
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot

• browser_drag

  • Description: Perform drag and drop between two elements
  • Parameters:
    • startElement (string): Human-readable source element description used to obtain permission to interact with the element
    • startRef (string): Exact source element reference from the page snapshot
    • endElement (string): Human-readable target element description used to obtain permission to interact with the element
    • endRef (string): Exact target element reference from the page snapshot

• browser_type

  • Description: Type text into editable element
  • Parameters:
    • element (string): Human-readable element description used to obtain permission to interact with the element
    • ref (string): Exact target element reference from the page snapshot
    • text (string): Text to type into the element
    • submit (boolean): Whether to submit entered text (press Enter after)

• browser_press_key

  • Description: Press a key on the keyboard
  • Parameters:
    • key (string): Name of the key to press or a character to generate, such as ArrowLeft or a

• browser_snapshot

  • Description: Capture accessibility snapshot of the current page (better than screenshot)
  • Parameters: None

• browser_save_as_pdf

  • Description: Save page as PDF
  • Parameters: None

• browser_wait

  • Description: Wait for a specified time in seconds
  • Parameters:
    • time (number): The time to wait in seconds (capped at 10 seconds)

• browser_close

  • Description: Close the page
  • Parameters: None

Vision Mode

Vision Mode provides tools for visual-based interactions using screenshots. Here are all available tools:

• browser_navigate

  • Description: Navigate to a URL
  • Parameters:
    • url (string): The URL to navigate to

• browser_go_back

  • Description: Go back to the previous page
  • Parameters: None

• browser_go_forward

  • Description: Go forward to the next page
  • Parameters: None

• browser_screenshot

  • Description: Capture screenshot of the current page
  • Parameters: None

• browser_move_mouse

  • Description: Move mouse to specified coordinates
  • Parameters:
    • x (number): X coordinate
    • y (number): Y coordinate

• browser_click

  • Description: Click at specified coordinates
  • Parameters:
    • x (number): X coordinate to click at
    • y (number): Y coordinate to click at

• browser_drag

  • Description: Perform drag and drop operation
  • Parameters:
    • startX (number): Start X coordinate
    • startY (number): Start Y coordinate
    • endX (number): End X coordinate
    • endY (number): End Y coordinate

• browser_type

  • Description: Type text at specified coordinates
  • Parameters:
    • text (string): Text to type
    • submit (boolean): Whether to submit entered text (press Enter after)

• browser_press_key

  • Description: Press a key on the keyboard
  • Parameters:
    • key (string): Name of the key to press or a character to generate, such as ArrowLeft or a

• browser_save_as_pdf

  • Description: Save page as PDF
  • Parameters: None

• browser_wait

  • Description: Wait for a specified time in seconds
  • Parameters:
    • time (number): The time to wait in seconds (capped at 10 seconds)

• browser_close

  • Description: Close the page
  • Parameters: None