Stealth Browser Mcp

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.

[](https://modelcontextprotocol.io) [](https://github.com/vibheksoni/stealth-browser-mcp/stargazers) [](LICENSE) [](https://discord.gg/secrets) [](CONTRIBUTING.md)

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Table of Contents

• [Demo](#demo)
• [Features](#features)
• [Quickstart](#quickstart)
• [Modular Architecture](#modular-architecture)
• [Toolbox](#toolbox)
• [Stealth vs Playwright MCP](#stealth-vs-playwright-mcp)
• [Troubleshooting](#troubleshooting)
• [Examples](#examples)
• [Showcase](#showcase)
• [Roadmap](#roadmap)
• [Contributing](#contributing)
• [Support](#support)
• [License](#license)

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Demo

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

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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

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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.

Manual JSON configuration (Claude Desktop, Cursor, etc.)

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": {}
    }
  }
}

FastMCP CLI (untested)

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.

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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 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 . | | 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_BROWSER_MCP_AUTH_TOKEN=replace-with-a-long-random-token"
Environment="BROWSER_IDLE_TIMEOUT=900"
Environment="BROWSER_IDLE_REAPER_INTERVAL=30"
Environment="BROWSER_ORPHAN_PROFILE_MAX_AGE=43200"
Environment="BROWSER_FILE_UPLOAD_ALLOWED_DIRS=/srv/stealth-browser/uploads:/srv/stealth-browser/shared"
ExecStart=/path/to/venv/bin/python /path/to/stealth-browser-mcp/src/server.py --transport http --host 0.0.0.0

• Docker / container HTTP

docker run --rm -p 8000:8000 \
  -e STEALTH_BROWSER_MCP_AUTH_TOKEN="replace-with-a-long-random-token" \
  stealth-browser-mcp

from fastmcp import Client
from fastmcp.client.auth import BearerAuth

client = Client(
    "http://localhost:8000/mcp/",
    auth=BearerAuth("replace-with-a-long-random-token"),
)

Per-instance override

If you want a single browser instance to live longer or shorter than the server default, pass idle_timeout_seconds in spawn_browser(...).

Examples:

• spawn_browser(idle_timeout_seconds=1800) keeps that instance for 30 minutes of inactivity.
• spawn_browser(idle_timeout_seconds=0) disables idle reaping for that one instance.

Available sections:

| Section | Tools | Description | |---------|-------|-------------| | browser-management | 8 | Core browser operations | | element-interaction | 12 | Page interaction and manipulation | | element-extraction | 9 | Element cloning and extraction | | file-extraction | 9 | File-based extraction tools | | network-debugging | 10 | Network monitoring and interception | | cdp-functions | 14 | Chrome DevTools Protocol execution | | progressive-cloning | 10 | Advanced element cloning | | cookies-storage | 3 | Cookie and storage management | | tabs | 5 | Tab management | | debugging | 7 | Debug and system tools | | dynamic-hooks | 10 | AI-powered network hooks |

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Toolbox

Browser Management

| Tool | Description | |------|-------------| | spawn_browser() | Create undetectable browser instance | | navigate() | Navigate to URLs | | close_instance() | Clean shutdown of browser | | list_instances() | Manage multiple sessions | | get_instance_state() | Full browser state information | | go_back() | Navigate back in history | | go_forward() | Navigate forward in history | | reload_page() | Reload current page |

Element Interaction

| Tool | Description | |------|-------------| | query_elements() | Find elements by CSS/XPath | | click_element() | Natural clicking | | type_text() | Human-like typing with newline support | | paste_text() | Instant text pasting via CDP | | file_upload() | Upload allowlisted local files to file inputs | | scroll_page() | Natural scrolling | | wait_for_element() | Smart waiting | | execute_script() | Run JavaScript | | select_option() | Dropdown selection | | get_element_state() | Element properties | | get_page_content() | Full page HTML and text | | take_screenshot() | Optimized page screenshots |

Element Extraction (CDP-accurate)

| Tool | Description | |------|-------------| | extract_complete_element_cdp() | Complete CDP-based element clone | | clone_element_complete() | Complete element cloning | | extract_complete_element_to_file() | Save complete extraction to file | | extract_element_styles() | 300+ CSS properties via CDP | | extract_element_styles_cdp() | Pure CDP styles extraction | | extract_element_structure() | Full DOM tree | | extract_element_events() | React/Vue/framework listeners | | extract_element_animations() | CSS animations/transitions | | extract_element_assets() | Images, fonts, videos | | extract_related_files() | Related CSS/JS files |

File-Based Extraction

| Tool | Description | |------|-------------| | extract_element_styles_to_file() | Save styles to file | | extract_element_structure_to_file() | Save structure to file | | extract_element_events_to_file() | Save events to file | | extract_element_animations_to_file() | Save animations to file | | extract_element_assets_to_file() | Save assets to file | | clone_element_to_file() | Save complete clone to file | | list_clone_files() | List saved clone files | | cleanup_clone_files() | Clean up old clone files |

Network Debugging and Interception

| Tool | Description | |------|-------------| | list_network_requests() | List captured network requests | | get_request_details() | Inspect headers and payload for a request | | get_response_content() | Get response data from a request | | modify_headers() | Add custom headers to requests | | spawn_browser(block_resources=[...]) | Block tracking scripts, ads, etc. | | create_dynamic_hook() | Create Python functions to intercept/modify requests | | create_simple_dynamic_hook() | Quick hook creation with presets | | list_dynamic_hooks() | List active hooks with statistics | | get_dynamic_hook_details() | Inspect hook source code | | remove_dynamic_hook() | Remove a hook | | get_hook_documentation() | Request object structure and HookAction types | | get_hook_examples() | 10 detailed examples: blockers, redirects, proxies | | get_hook_requirements_documentation() | Pattern matching and best practices | | get_hook_common_patterns() | Ad blocking, API proxying, auth injection | | validate_hook_function() | Validate hook code before deployment |

CDP Function Execution

| Tool | Description | |------|-------------| | execute_cdp_command() | Direct CDP commands (use snake_case) | | add_script_to_evaluate_on_new_document() | Install pre-document scripts for API spoofing | | discover_global_functions() | Find JavaScript functions | | discover_object_methods() | Discover object methods (93+ methods) | | call_javascript_function() | Execute any function | | inject_and_execute_script() | Run custom JS code | | inspect_function_signature() | Inspect function details | | create_persistent_function() | Functions that survive reloads | | execute_function_sequence() | Execute function sequences | | create_python_binding() | Create Python-JS bindings | | execute_python_in_browser() | Execute Python code via py2js | | get_execution_contexts() | Get JS execution contexts | | list_cdp_commands() | List available CDP commands | | get_function_executor_info() | Get executor state info |

Progressive Element Cloning

| Tool | Description | |------|-------------| | clone_element_progressive() | Initial lightweight structure | | expand_styles() | On-demand styles expansion | | expand_events() | On-demand events expansion | | expand_children() | Progressive children expansion | | expand_css_rules() | Expand CSS rules data | | expand_pseudo_elements() | Expand pseudo-elements | | expand_animations() | Expand animations data | | list_stored_elements() | List stored elements | | clear_stored_element() | Clear specific element | | clear_all_elements() | Clear all stored elements |

Cookie and Storage

| Tool | Description | |------|-------------| | get_cookies() | Read cooki

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Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: vibheksoni
• Source: vibheksoni/stealth-browser-mcp
• License: MIT

Install and usage instructions live in the source repository linked above.