Selenium Server

Model Context Protocol server for browser automation using Selenium WebDriver.

66 tools for navigation, interaction, screenshots, assertions, cookies, tabs, HTTP API, recording, batch execution, iframes, and raw WebDriver access — all with strict hexagonal architecture.

TypeScript License Node

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Why this MCP?

Most Selenium MCPs expose basic WebDriver commands. This one adds the layers that make AI agents truly reliable:

Feature	Status
Page snapshot with stable element refs (capture_page → e1, e2, ...)	✅
Persistent per-domain selector hints	✅
HTTP API tools (GET/POST/PUT/PATCH/DELETE)	✅
Batch multi-step execution (up to 20 steps in 1 call)	✅
Built-in test assertions	✅
Raw WebDriver API access (run_selenium)	✅
Recording for test generation	✅
Dialog handling (alert/confirm/prompt)	✅
Cookie management	✅
Stealth mode	✅
Session tracing (NDJSON)	✅
Selenium Manager auto-provisioning	✅

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Quick Start

One-click install

Install in VS Code

From npm

npm install -g mcp-selenium-webdriver

Or run directly:

npx mcp-selenium-webdriver

Prerequisites

• Node.js 18+
• Chrome, Firefox, or Edge installed
• Selenium Manager provisions the matching driver automatically — no manual setup needed.

# Verify everything is ready
npx mcp-selenium-webdriver doctor

MCP Client Configuration

VS Code Copilot (.vscode/mcp.json):

{
  "servers": {
    "selenium-mcp": {
      "command": "npx",
      "args": ["mcp-selenium-webdriver"],
      "type": "stdio"
    }
  }
}

Claude Desktop:

{
  "mcpServers": {
    "selenium-mcp": {
      "command": "npx",
      "args": ["mcp-selenium-webdriver"]
    }
  }
}

Cursor (.cursor/mcp.json):

{
  "mcpServers": {
    "selenium-mcp": {
      "command": "npx",
      "args": ["mcp-selenium-webdriver"]
    }
  }
}

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Environment Variables

Variable	Default	Description
SELENIUM_BROWSER	chrome	Browser: chrome, firefox, edge
SELENIUM_HEADLESS	false	Run browser in headless mode
SELENIUM_STEALTH	false	Hide automation indicators
SELENIUM_GRID_URL	—	Selenium Grid hub URL
SELENIUM_MCP_OUTPUT_MODE	stdout	Output: stdout or file
SELENIUM_MCP_OUTPUT_DIR	auto	Custom output directory
SELENIUM_MCP_SAVE_TRACE	false	Save session trace as NDJSON
SELENIUM_MCP_UNRESTRICTED_FILES	false	Bypass workspace sandbox
HTTPS_PROXY / HTTP_PROXY	—	Corporate proxy

Pass them in your MCP config:

{
  "mcpServers": {
    "selenium-mcp": {
      "command": "npx",
      "args": ["mcp-selenium-webdriver"],
      "env": {
        "SELENIUM_HEADLESS": "true",
        "SELENIUM_STEALTH": "true"
      }
    }
  }
}

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CLI Flags

npx mcp-selenium-webdriver [flags]
npx mcp-selenium-webdriver doctor   # preflight diagnostics

Flag	Description
doctor	Run diagnostics (Chrome, driver, proxy, cache) and exit
--headless	Run browser headless
--stealth	Enable stealth mode
--save-trace	Save session trace JSON
--output-mode=stdout|file	Set output mode
--output-dir=<path>	Custom output directory
--grid-url=<url>	Selenium Grid hub URL
--allow-unrestricted-file-access	Bypass workspace sandbox

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Tools (66)

🧭 Navigation (7)

Tool	Description
navigate_to	Navigate to a URL. Starts browser automatically.
go_back	Navigate back in history.
go_forward	Navigate forward in history.
refresh_page	Refresh the current page.
scroll_page	Scroll the page or element into view.
get_current_url	Get the current URL. Read-only.
get_title	Get the page title. Read-only.

📸 Page Analysis (5)

Tool	Description
capture_page	Capture page state as element list with stable refs (e1-e300). Read-only.
get_page_source	Get the full HTML DOM. Read-only.
get_visible_text	Get visible text, optionally scoped to a CSS selector. Read-only.
get_visible_html	Get visible HTML (scripts removed by default). Read-only.
take_screenshot	Take a screenshot (viewport, full-page, or element).

🖱️ Elements (9)

Tool	Description
click_element	Click an element by CSS selector or ref.
hover_element	Hover over an element.
double_click	Double-click an element.
right_click	Right-click (context menu) an element.
select_option	Select a dropdown option by value, text, or index.
drag_drop	Drag one element to another.
teach_selector	Teach a preferred CSS selector for a domain.
iframe_click	Click an element inside an iframe.
iframe_fill	Fill an input inside an iframe.

⌨️ Input (3)

Tool	Description
input_text	Type text into an input field.
key_press	Press a keyboard key, optionally with modifiers (ctrl, alt, shift, meta).
file_upload	Upload a file through a file input.

🖲️ Mouse (3)

Tool	Description
mouse_move	Move mouse to coordinates.
mouse_click	Click at coordinates (left, right, middle).
mouse_drag	Drag from one position to another.

📑 Tabs (4)

Tool	Description
tab_list	List all open tabs. Read-only.
tab_select	Switch to a specific tab.
tab_new	Open a new tab.
tab_close	Close a tab.

✅ Verification (4)

Tool	Description
verify_element_visible	Verify an element is visible. Read-only.
verify_text_visible	Verify text is visible. Read-only.
verify_value	Verify an input has the expected value. Read-only.
verify_list_visible	Verify multiple texts are visible. Read-only.

🌐 Browser Control (7)

Tool	Description
wait_for	Wait for a condition (element visible, URL, title...).
execute_javascript	Run JavaScript in the browser context.
resize_window	Resize the browser window.
dialog_handle	Handle dialogs (alert, confirm, prompt).
console_logs	Get browser console logs with filtering. Read-only.
network_monitor	Monitor network requests / toggle offline mode.
pdf_generate	Generate a PDF from the current page. Read-only.

🔄 Browser Lifecycle (5)

Tool	Description
start_browser	Start the browser explicitly with options.
close_browser	Close the browser and end the session.
reset_session	Reset the session (close + restart).
set_stealth_mode	Enable/disable stealth mode.
browser_status	Get session status (URL, title, state). Read-only.

🍪 Cookies (3)

Tool	Description
get_cookies	Get all cookies. Read-only.
add_cookie	Add a cookie.
delete_cookie	Delete a cookie by name.

⏺️ Recording (4)

Tool	Description
start_recording	Start recording actions for test generation.
stop_recording	Stop recording and return the action log.
recording_status	Check recording status. Read-only.
clear_recording	Clear all recorded actions.

💾 Selector Hints (4)

Tool	Description
selector_hint_save	Save a preferred CSS selector for a domain.
selector_hint_get	Get saved hints for a domain. Read-only.
selector_hint_list	List domains with hints. Read-only.
selector_hint_delete	Delete a hint.

🌍 HTTP API (5)

Tool	Description
http_get	HTTP GET request. Read-only.
http_post	HTTP POST request with body.
http_put	HTTP PUT request.
http_patch	HTTP PATCH request.
http_delete	HTTP DELETE request.

⚡ Power Tools (3)

Tool	Description
batch_execute	Execute up to 20 tool steps in a single call.
run_selenium	Execute raw Selenium WebDriver API code (access to driver, By, until, Key).
browser_generate_locator	Generate a robust locator for an element by description. Read-only.

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Architecture

Hexagonal architecture (Ports & Adapters):

src/
├── domain/
│   ├── models/          Pure types & value objects
│   ├── ports/           18 interfaces (IBrowserPort, INavigationPort...)
│   └── services/        16 use cases
├── adapters/
│   ├── selenium/        14 Selenium WebDriver implementations
│   ├── mcp/             MCP SDK server & tool registry
│   ├── persistence/     File system & selector hints storage
│   └── logging/         Console & trace (NDJSON) loggers
├── infrastructure/      DI container (tsyringe), bootstrap, config
├── index.ts             Entry point
└── cli.ts               CLI (doctor, flags)

Key design decisions:

• Dependency Injection via tsyringe with Symbol tokens — every port is swappable
• Zod would be used for runtime validation (planned)
• Selenium Manager auto-provisions chromedriver matching your installed Chrome version
• 16-phase selector engine for capture_page (ID → testId → role → label → ... → positional index)
• Stealth mode injects scripts to hide navigator.webdriver and automation indicators

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Example Usage

Ask your AI agent:

Navigate to https://example.com, capture the page, click the first link, take a screenshot, verify "Example Domain" is visible.

The agent chains the tools automatically:

navigate_to → capture_page → click_element → take_screenshot → verify_text_visible

Or use raw WebDriver API:

run_selenium with:
  const el = await driver.findElement(By.css('h1'));
  const text = await el.getText();
  return text;

Batch execution:

batch_execute with:
  steps: [
    { tool: "navigate_to", args: { url: "https://example.com" } },
    { tool: "take_screenshot", args: { name: "before" } },
    { tool: "click_element", args: { selector: "a" } },
    { tool: "take_screenshot", args: { name: "after" } }
  ]

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Development

git clone <this-repo>
cd mcp-selenium-webdriver
npm install
npm run build
npm run doctor

Scripts

npm run build          # Compile TypeScript
npm run dev            # Run with tsx (hot reload)
npm run typecheck      # Type-check without emitting
npm test               # Run all tests
npm run test:coverage  # Run tests with coverage

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License

MIT