SelAgent

A Selenium-powered MCP server that exposes browser automation as tool calls. Designed to let AI agents navigate, interact with, and test web pages through natural language.

Usage

Prerequisites:

• UV Package Manager

1. Initialize the Project

SelAgent uses uv (a fast alternative to pip). Run the following in your project directory:

uv init

2. Configure the MCP Server

You can install SelAgent automatically or configure it manually for your preferred client.

Option A: Automatic Installation (Claude Desktop)

uv run mcp install main.py

Note on Automatic Installation

The above command only works if the Claude Desktop config is in C:\Users\[username]\AppData\Roaming\Claude.
Otherwise you must manually update the configuration.
If installed from the Microsoft Store, the path would be C:\Users\[username]\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude

Option B: Manual Configuration for Claude Desktop

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "selagent": {
      "command": "C:\\path\\to\\uv.exe",
      "args": [
        "run",
        "--with",
        "mcp[cli]",
        "mcp",
        "run",
        "C:\\path\\to\\SelAgent\\main.py"
      ]
    }
  }
}

Config File Locations

Standard install: C:\Users\[username]\AppData\Roaming\Claude.
Microsoft Store install: C:\Users\[username]\AppData\Local\Packages\Claude_pzs8sxrjxfjjc\LocalCache\Roaming\Claude

Option C: Manual Configuration for VS Code

1. Press Ctrl + Shift + P and select MCP: Add Server
2. Select Command and enter: uv run --with mcp[cli] mcp run C:\path\to\SelAgent\main.py
3. Alternatively, update C:\Users\[username]\AppData\Roaming\Code\User\mcp.json directly:

{
  "servers": {
    "selagent": {
      "type": "stdio",
      "command": "uv",
      "args": [
        "run",
        "--with",
        "mcp[cli]",
        "mcp",
        "run",
        "C:\\path\\to\\SelAgent\\main.py"
      ]
    }
  }
}

Tools

Browser

• Set headless or visible mode (before first navigation)
• Quit the current session and start a fresh one
• Close the browser and release all resources

Navigation

• Navigate to a URL and wait for page load
• Return the current page URL
• Return the page title
• Return the full HTML source
• Browser history navigation
• Reload the current page

Element Finding & Extraction

• Find a single element by locator (id, name, class, css, xpath, tag, data-*)
• Find all matching elements
• Get visible text of an element
• Get an HTML attribute value
• Return all visible text on the page
• Extract all <a> elements with href, id, text
• Extract all <img> elements with src, alt, id
• Extract all <input> elements with type, name, id, placeholder, value
• Extract all <button> elements with type, name, id, text
• Extract all <form> elements with action, method, id, name

Actions

• Click an element
• Type text into an input/textarea (clears first by default)
• Clear the content of an input/textarea
• Hover the mouse over an element
• Drag source element onto destination element
• Upload a file to a file-type input

Forms

• Select an option from a <select> dropdown
• Toggle checkbox state
• Select a radio button
• Fill form fields by matching name, id, placeholder, or label text
• Submit a form element
• Submit a form and return the resulting page text

Explicit Waits

• Wait until an element is present (or visible)
• Wait until text appears on the page
• Wait until the URL changes
• Wait until the URL contains a fragment
• Wait until document.readyState is complete

Assertions

• Verify text presence on page
• Verify an element exists in the DOM
• Verify an element is visible
• Verify an element is enabled

Screenshots

• Capture a full-page screenshot (saves to temp if no path given)

Windows & Frames

• List all open window/tab handles
• Switch to a window/tab by handle
• Close the current window/tab
• Switch into an iframe by locator or index
• Exit all iframes back to the top-level page

Alerts

• Accept (OK) the current alert
• Dismiss (Cancel) the current alert
• Read alert text without acting on it

Scrolling

• Scroll until an element is centered in viewport
• Scroll to page extremes
• Scroll by a relative pixel amount

Keyboard

• Send keys to a specific element
• Press a special key globally (enter, tab, escape, etc.)
• Press a keyboard shortcut (e.g. ctrl+a, ctrl+shift+t)

JavaScript & Inspection

• Execute arbitrary JavaScript and return the result
• Return a structured summary of all interactive elements on the page

Cookies

• Return all cookies for the current domain
• Return a single cookie by name
• Add a cookie with the given name and value
• Delete a specific cookie by name
• Delete all cookies for the current domain

Local Storage

• Get a value from localStorage by key
• Set a key-value pair in localStorage
• Return all localStorage key-value pairs
• Clear all localStorage entries

Session Storage

• Get a value from sessionStorage by key
• Set a key-value pair in sessionStorage
• Return all sessionStorage key-value pairs
• Clear all sessionStorage entries

Additional Resources

• Python MCP SDK