Stealth Browser MCP

Undetectable browser automation for MCP-compatible AI agents.

Bypass Cloudflare, antibot systems, and social media blocks with real browser instances powered by nodriver + Chrome DevTools Protocol + FastMCP.

Demo
Features
Quickstart
Modular Architecture
Toolbox
Stealth vs Playwright MCP
Troubleshooting
Examples
Showcase
Roadmap
Contributing
Support
License

Demo

Stealth Browser MCP bypassing Cloudflare, cloning UI elements, and intercepting network traffic — all through AI chat commands.

Features

Antibot bypass — Works on Cloudflare, Queue-It, and other protection systems that block traditional automation
97 tools across 11 sections — From basic navigation to advanced CDP function execution
Modular loading — Run the full 97-tool arsenal or a minimal 20-tool core; disable what you don't need
Pixel-accurate element cloning — Extract complete elements with all CSS, DOM structure, events, and assets via CDP
Network interception — Inspect every request, response, header, and payload through your AI agent
Dynamic hook system — AI-generated Python functions that intercept and modify network traffic in real-time
Instant text input — Paste large content via CDP or type with human-like keystrokes and newline support
Cross-platform — Windows, macOS, Linux, Docker, and CI/CD pipelines with automatic environment detection
Browser support — Chrome, Chromium, and Microsoft Edge (automatic detection)
Clean MCP integration — No custom brokers or wrappers; works with Claude Code, Claude Desktop, Cursor, and any MCP client

Quickstart

1. Clone and install

git clone https://github.com/vibheksoni/stealth-browser-mcp.git
cd stealth-browser-mcp
python -m venv venv

# Activate virtual environment
# Windows:
venv\Scripts\activate
# Mac/Linux:
source venv/bin/activate

pip install -r requirements.txt

2. Add to your MCP client

Claude Code CLI (recommended):

Windows:

claude mcp add-json stealth-browser-mcp "{\"type\":\"stdio\",\"command\":\"C:\\path\\to\\stealth-browser-mcp\\venv\\Scripts\\python.exe\",\"args\":[\"C:\\path\\to\\stealth-browser-mcp\\src\\server.py\"]}"

Mac/Linux:

claude mcp add-json stealth-browser-mcp '{
  "type": "stdio",
  "command": "/path/to/stealth-browser-mcp/venv/bin/python",
  "args": ["/path/to/stealth-browser-mcp/src/server.py"]
}'

Replace /path/to/stealth-browser-mcp/ with your actual project path.

Windows (%APPDATA%\Claude\claude_desktop_config.json):

{
  "mcpServers": {
    "stealth-browser-mcp": {
      "command": "C:\\path\\to\\stealth-browser-mcp\\venv\\Scripts\\python.exe",
      "args": ["C:\\path\\to\\stealth-browser-mcp\\src\\server.py"],
      "env": {}
    }
  }
}

Mac/Linux (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "stealth-browser-mcp": {
      "command": "/path/to/stealth-browser-mcp/venv/bin/python",
      "args": ["/path/to/stealth-browser-mcp/src/server.py"],
      "env": {}
    }
  }
}

pip install fastmcp
fastmcp install claude-desktop src/server.py --with-requirements requirements.txt
# OR
fastmcp install claude-code src/server.py --with-requirements requirements.txt
# OR
fastmcp install cursor src/server.py --with-requirements requirements.txt

3. Test it

Restart your MCP client and ask your agent:

"Use stealth-browser to navigate to https://example.com and take a screenshot."

Agent Skill

This repo includes an agent skill at skills/stealth-browser-mcp for clients that support Codex-style skills. It teaches agents the recommended tool order, state checks, pre-document CDP script usage, network debugging flow, and browser cleanup rules.

Use the skill when an LLM struggles to choose the right MCP tool or forgets to verify browser state after actions. If your client does not load repo-local skills automatically, add or symlink skills/stealth-browser-mcp into your client skills directory.

Modular Architecture

Choose exactly what functionality you need. Run the full 97-tool suite or strip it down to 20 core tools.

| Mode | Tools | Use Case | |------|-------|----------| | Full (default) | 97 | Complete browser automation and debugging | | Minimal (--minimal) | 20 | Core browser automation only | | Custom (--disable-*) | Your choice | Disable specific sections |

python src/server.py --minimal
python src/server.py --disable-cdp-functions --disable-dynamic-hooks
python src/server.py --list-sections
python src/server.py --debug

Use --debug or set STEALTH_BROWSER_DEBUG=1 to enable verbose server diagnostics on stderr. In normal MCP stdio usage, debug logging stays quiet by default to avoid noisy transport output.

HTTP transport security

stdio transport is recommended for local MCP clients and does not require HTTP auth.
HTTP transport remains unauthenticated by default for backward compatibility.
Do not expose unauthenticated HTTP transport outside trusted local or private networks.
Set STEALTH_BROWSER_MCP_AUTH_TOKEN to enable bearer-token auth for HTTP transport.
Clients must send Authorization: Bearer <token> after HTTP auth is enabled.

Browser lifecycle defaults

Idle browser instances are reaped automatically after 10 minutes by default.
Override per instance with spawn_browser(idle_timeout_seconds=...).
Disable idle reaping globally with BROWSER_IDLE_TIMEOUT=0.
Tune the background reaper cadence with BROWSER_IDLE_REAPER_INTERVAL.
Tune startup cleanup of abandoned temp profiles with BROWSER_ORPHAN_PROFILE_MAX_AGE (seconds).
Restrict local file uploads with BROWSER_FILE_UPLOAD_ALLOWED_DIRS.

Server Environment Variables

These are regular environment variables for the MCP server process itself. Set them wherever you launch src/server.py:

| Variable | Default | Meaning | |----------|---------|---------| | STEALTH_BROWSER_MCP_AUTH_TOKEN | unset | Optional bearer token for HTTP transport. When set, HTTP clients must send Authorization: Bearer <token>. | | MCP_AUTH_TOKEN | unset | Backward-compatible alias for STEALTH_BROWSER_MCP_AUTH_TOKEN. | | BROWSER_IDLE_TIMEOUT | 600 | Global idle timeout in seconds before an unused browser instance is auto-closed. Set 0 to disable idle reaping globally. | | BROWSER_IDLE_REAPER_INTERVAL | 60 | Background reaper check interval in seconds. | | BROWSER_ORPHAN_PROFILE_MAX_AGE | 21600 | Startup cleanup threshold in seconds for stale uc_* temp profiles that are not in use by live browser processes. Set 0 to disable this startup sweep. | | BROWSER_FILE_UPLOAD_ALLOWED_DIRS | repo root | Directories that file_upload() may read from. Separate multiple roots with ; on Windows or : on macOS/Linux. | | STEALTH_BROWSER_DEBUG | 0 | Enable verbose debug logging to stderr when set to 1. |

Where to set them

Shell / local terminal

# macOS / Linux
export STEALTH_BROWSER_MCP_AUTH_TOKEN="replace-with-a-long-random-token"
export BROWSER_IDLE_TIMEOUT=900
export BROWSER_IDLE_REAPER_INTERVAL=30
export BROWSER_ORPHAN_PROFILE_MAX_AGE=43200
export BROWSER_FILE_UPLOAD_ALLOWED_DIRS="/Users/me/uploads:/Users/me/Documents"
python src/server.py

# Windows PowerShell
$env:STEALTH_BROWSER_MCP_AUTH_TOKEN='replace-with-a-long-random-token'
$env:BROWSER_IDLE_TIMEOUT='900'
$env:BROWSER_IDLE_REAPER_INTERVAL='30'
$env:BROWSER_ORPHAN_PROFILE_MAX_AGE='43200'
$env:BROWSER_FILE_UPLOAD_ALLOWED_DIRS='C:\Users\me\uploads;C:\Users\me\Documents'
python src/server.py

MCP client config Put them in the server env block for your client.

{
  "mcpServers": {
    "stealth-browser-mcp": {
      "command": "C:\\path\\to\\stealth-browser-mcp\\venv\\Scripts\\python.exe",
      "args": ["C:\\path\\to\\stealth-browser-mcp\\src\\server.py"],
      "env": {
        "STEALTH_BROWSER_MCP_AUTH_TOKEN": "replace-with-a-long-random-token",
        "BROWSER_IDLE_TIMEOUT": "900",
        "BROWSER_IDLE_REAPER_INTERVAL": "30",
        "BROWSER_ORPHAN_PROFILE_MAX_AGE": "43200",
        "BROWSER_FILE_UPLOAD_ALLOWED_DIRS": "C:\\Users\\me\\uploads;C:\\Users\\me\\Documents"
      }
    }
  }
}

systemd / long-running service

[Service]
Environment="STEALTH_BROW

stealth-browser-mcp

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