MCP Selenium Server

A Model Context Protocol (MCP) server implementation for Selenium WebDriver, enabling browser automation through standardized MCP clients.

Video Demo (Click to Watch)

Features

• Start browser sessions with customizable options
• Navigate to URLs
• Find elements using various locator strategies
• Accessibility tree snapshot (Chromium only)
• Semantic element search via accessibility tree (Chromium only)
• Click, type, and interact with elements
• Perform mouse actions (hover, drag and drop)
• Handle keyboard input
• Take screenshots
• Upload files
• Support for headless mode

Supported Browsers

• Chrome
• Firefox
• MS Edge

Use with Goose

Option 1: One-click install

Copy and paste the link below into a browser address bar to add this extension to goose desktop:

goose://extension?cmd=npx&arg=-y&arg=%40katalon-labs%2Fmcp-selenium&id=selenium-mcp&name=Selenium%20MCP&description=automates%20browser%20interactions

Option 2: Add manually to desktop or CLI

• Name: Selenium MCP
• Description: automates browser interactions
• Command: npx -y @katalon-labs/mcp-selenium

Use with other MCP clients (e.g. Claude Desktop, etc)

{
  "mcpServers": {
    "selenium": {
      "command": "npx",
      "args": ["-y", "@katalon-labs/mcp-selenium"]
    }
  }
}

Development

To work on this project:

1. Clone the repository
2. Install dependencies: npm install
3. Run the server: npm start

Scripts

• npm start: Starts the MCP server via stdio.
• npm run dev: Starts with file watching (node --watch) for local development.

Installation

Installing via Smithery

To install MCP Selenium for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @katalon-labs/mcp-selenium --client claude

Manual Installation

npm install -g @katalon-labs/mcp-selenium

Usage

Start the server by running:

mcp-selenium

Or use with NPX in your MCP configuration:

{
  "mcpServers": {
    "selenium": {
      "command": "npx",
      "args": [
        "-y",
        "@katalon-labs/mcp-selenium"
      ]
    }
  }
}

Tools

browser_snapshot

Captures the page accessibility tree and returns a YAML snapshot that includes refs (e.g., [ref=e37]) for element actions.

Chromium only (Chrome/Edge). Refs are ephemeral and tied to the current snapshot.

Parameters:

• format (optional): Currently only yaml is supported.

Example:

{
  "tool": "browser_snapshot",
  "parameters": {
    "format": "yaml"
  }
}

find_elements_semantic

Finds elements using a natural language description by searching the accessibility tree.

Chromium only (Chrome/Edge).

Parameters:

• description (required): Natural language description.
• limit (optional): Max results to return (default 5).

Example:

{
  "tool": "find_elements_semantic",
  "parameters": {
    "description": "login button",
    "limit": 3
  }
}

start_browser

Launches a browser session.

Parameters:

• browser (required): Browser to launch
  • Type: string
  • Enum: ["chrome", "firefox"]
• options: Browser configuration options
  • Type: object
  • Properties:
    • headless: Run browser in headless mode
      • Type: boolean
    • arguments: Additional browser arguments
      • Type: array of strings

Example:

{
  "tool": "start_browser",
  "parameters": {
    "browser": "chrome",
    "options": {
      "headless": true,
      "arguments": ["--no-sandbox"]
    }
  }
}

navigate

Navigates to a URL.

Parameters:

• url (required): URL to navigate to
  • Type: string

Example:

{
  "tool": "navigate",
  "parameters": {
    "url": "https://www.example.com"
  }
}

find_element

Finds an element on the page.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "find_element",
  "parameters": {
    "by": "id",
    "value": "search-input",
    "timeout": 5000
  }
}

click_element

Clicks an element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "click_element",
  "parameters": {
    "by": "css",
    "value": ".submit-button"
  }
}

send_keys

Sends keys to an element (typing).

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• text (required): Text to enter into the element
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "send_keys",
  "parameters": {
    "by": "name",
    "value": "username",
    "text": "testuser"
  }
}

get_element_text

Gets the text() of an element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "get_element_text",
  "parameters": {
    "by": "css",
    "value": ".message"
  }
}

hover

Moves the mouse to hover over an element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "hover",
  "parameters": {
    "by": "css",
    "value": ".dropdown-menu"
  }
}

drag_and_drop

Drags an element and drops it onto another element.

Parameters:

• by (required): Locator strategy for source element
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the source locator strategy
  • Type: string
• targetBy (required): Locator strategy for target element
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• targetValue (required): Value for the target locator strategy
  • Type: string
• timeout: Maximum time to wait for elements in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot for source element (e.g., e37)
• element (optional): Natural language description for source element

Example:

{
  "tool": "drag_and_drop",
  "parameters": {
    "by": "id",
    "value": "draggable",
    "targetBy": "id",
    "targetValue": "droppable"
  }
}

double_click

Performs a double click on an element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "double_click",
  "parameters": {
    "by": "css",
    "value": ".editable-text"
  }
}

right_click

Performs a right click (context click) on an element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "right_click",
  "parameters": {
    "by": "css",
    "value": ".context-menu-trigger"
  }
}

press_key

Simulates pressing a keyboard key.

Parameters:

• key (required): Key to press (e.g., 'Enter', 'Tab', 'a', etc.)
  • Type: string

Example:

{
  "tool": "press_key",
  "parameters": {
    "key": "Enter"
  }
}

upload_file

Uploads a file using a file input element.

Parameters:

• by (required): Locator strategy
  • Type: string
  • Enum: ["id", "css", "xpath", "name", "tag", "class"]
• value (required): Value for the locator strategy
  • Type: string
• filePath (required): Absolute path to the file to upload
  • Type: string
• timeout: Maximum time to wait for element in milliseconds
  • Type: number
  • Default: 10000
• ref (optional): Element reference from snapshot (e.g., e37)
• element (optional): Natural language description resolved via accessibility tree

Example:

{
  "tool": "upload_file",
  "parameters": {
    "by": "id",
    "value": "file-input",
    "filePath": "/path/to/file.pdf"
  }
}

take_screenshot

Captures a screenshot of the current page.

Parameters:

• outputPath (optional): Path where to save the screenshot. If not provided, returns base64 data.
  • Type: string

Example:

{
  "tool": "take_screenshot",
  "parameters": {
    "outputPath": "/path/to/screenshot.png"
  }
}

close_session

Closes the current browser session and cleans up resources.

Parameters: None required

Example:

{
  "tool": "close_session",
  "parameters": {}
}

License

MIT

Notes:

• Accessibility features require Chromium (Chrome or Edge). Firefox will return an explicit unsupported error.
• Refs are ephemeral per snapshot; call browser_snapshot to get fresh refs when the page changes.