Very Important

Automation of Whatsapp Messages without Meta (Business-)API is against WhatsApp' Terms of Service! You take full responsibility for everything you do with this MCP-Server. It is possible that your account will be flagged/restricted.

MCP WhatsApp Web (TypeScript)

A Model Context Protocol (MCP) server for WhatsApp Web, implemented in TypeScript. This project is a TypeScript port of the original whatsapp-mcp repository.

With this MCP server, you can:

• Search and read your personal WhatsApp messages (including media)
• Search your contacts
• Send messages to individuals or groups
• Send and receive media files (images, videos, documents, audio)

Features

• TypeScript Implementation: Fully typed codebase for better developer experience and code reliability
• Selectable WhatsApp Backend: Uses whatsapp-web.js by default, with an optional Baileys backend that runs without a browser
• MCP Server: Implements the Model Context Protocol for seamless integration with AI assistants
• Media Support: Send and receive images, videos, documents, and audio messages
• Multiple Transport Options: Supports stdio and Streamable HTTP transports — even both at once from a single process (start with stdio and set MCP_HTTP_PORT to additionally expose http://127.0.0.1:<port>/mcp, or run HTTP-only with --http)
• Flexible Authentication: QR code (as an MCP image tool), pairing code (request_pairing_code tool, or automatically printed to stderr at startup via WHATSAPP_PAIRING_PHONE_NUMBER), and an optional OAuth flow for HTTP clients (MCP_OAUTH=true) where the browser authorization page shows the WhatsApp QR code — unlinking WhatsApp revokes tokens so clients automatically re-authenticate

Architecture

This MCP server consists of:

1. TypeScript MCP Server: Implements the Model Context Protocol to provide standardized tools for AI assistants to interact with WhatsApp
2. WhatsApp Backend: A shared service interface selects web.js/Puppeteer or Baileys/WebSocket, handles authentication, and manages message sending/receiving
3. Tool Implementations: Provides various tools for contacts, chats, messages, media, and authentication

Prerequisites

• Node.js >= 22.0.0 (Node 22 or 24 recommended for the Baileys SQLite dependency)
• npm or yarn
• For the default webjs backend: Google Chrome or Microsoft Edge (auto-detected; needed for video/GIF codec support; other operations can use Puppeteer's bundled Chromium)
• For baileys: install optional dependencies, including the native better-sqlite3 module. No Chrome, Edge, or Chromium is needed at runtime.

FFmpeg is bundled automatically via the ffmpeg-static npm package — no manual installation needed. You can point the FFMPEG_PATH environment variable at your own binary to override it.

Installation

Manual Installation

1. Clone this repository

   bash

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   git clone https://github.com/mario-andreschak/mcp-whatsapp-web.git
   cd mcp-whatsapp-web
   

2. Install dependencies

   Terminal

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   npm install
   

3. Build the project

   Terminal

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   npm run build
   

4. Configure environment variables (optional)

   Copy the example environment file and modify as needed:

   bash

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   cp .env.example .env
   

   You can select the backend with WHATSAPP_BACKEND, adjust logging levels, pin the WhatsApp Web version, or override the auto-detected browser (BROWSER_EXECUTABLE_PATH) and ffmpeg binary (FFMPEG_PATH). WHATSAPP_HEADLESS=false shows the web.js browser window, and WHATSAPP_SESSION_DIR relocates its persistent profile. Use an absolute session directory to keep it consistent across working directories.

Choosing a backend

WHATSAPP_BACKEND=webjs is the default and preserves existing sessions and MCP tool names. It uses a dedicated persistent LocalAuth profile, not your personal Chrome profile. It now keeps the browser's native user agent and graphics defaults, omits Puppeteer's automation banner flag, and leaves the browser sandbox enabled. Containers that require disabling the sandbox can explicitly set WHATSAPP_NO_SANDBOX=true. These settings do not guarantee that automation is undetectable.

To use the optional Baileys backend, set these variables in your MCP client configuration or .env, then restart the server:

WHATSAPP_BACKEND=baileys
BAILEYS_SESSION_DIR=C:/path/to/your/baileys-sessions

BAILEYS_SESSION_DIR defaults to <working directory>/baileys-sessions; the example above should be replaced with your own absolute directory. Pair this backend separately with get_qr_code or request_pairing_code. The existing WHATSAPP_PAIRING_PHONE_NUMBER option also works. Baileys cannot reuse the web.js browser profile. You can switch back to webjs and resume its existing session.

Baileys and SQLite are pinned optional dependencies installed by normal npm install. If your package manager omitted them, run npm install --include=optional. SQLite uses a native addon; a supported prebuilt binary or a local native build toolchain is required. To avoid downloading Chromium when installing for Baileys or an existing system browser, use:

$env:PUPPETEER_SKIP_DOWNLOAD = 'true'
npm install --include=optional
npm run build

On macOS/Linux, the equivalent installation command is PUPPETEER_SKIP_DOWNLOAD=true npm install --include=optional. Selecting Baileys loads only its driver and never starts or cleans up browser processes. An unavailable backend produces an error; it never silently switches drivers or retries a send through another backend.

Baileys sessions and history

• Credentials, Signal keys, contacts, chats and messages persist in BAILEYS_SESSION_DIR/session.sqlite. Keep the whole directory private and out of version control. Only one running server may own a session directory. Use separate directories for independent accounts.
• Normal shutdown preserves the session. Explicit logout or invalid authentication clears the Baileys credentials and cached account data, and revokes its OAuth access tokens. Baileys HTTP OAuth state is stored separately from web.js in BAILEYS_SESSION_DIR/oauth-store.json.
• get_backend_status reports the active backend, authentication, stored record counts and history synchronization state. Being connected does not mean history has finished arriving. An available history state means local data is available, not that WhatsApp supplied a complete archive.
• Contact and history tools query the local synchronized store. Initial full-history sync is requested and can take time on large accounts. list_messages may request up to 100 additional older messages when a known chat has fewer than requested, with a bounded wait and a per-chat cooldown. Late history batches are persisted for subsequent queries. WhatsApp may still supply only part of an account's history.
• Treat returned message IDs as opaque and use IDs from the active backend. Legacy @c.us phone-number inputs, @s.whatsapp.net, groups and @lid identifiers are supported; known LID/phone mappings are persisted. Message IDs from web.js cannot be passed to Baileys or vice versa.
• Text, media, downloads, voice notes and the existing authentication tools use the same MCP interface. Voice-note inputs must be local files or base64; FFmpeg converts them to mono Opus/Ogg before sending. If conversion fails, the tool reports an error without sending a different message type.

The Baileys backend is opt-in and pinned to 7.0.0-rc14. Review upstream changes before upgrading, especially authentication and message-format migrations. See the Baileys documentation and release history.

Installation with FLUJO

FLUJO provides a streamlined installation process:

1. Navigate to the MCP section in FLUJO
2. Click "Add Server"
3. Copy and paste this GitHub repository URL: https://github.com/mario-andreschak/mcp-whatsapp-web
4. Click "Parse", "Clone, "Install", "Build" and "Update Server"

FLUJO will automatically handle the cloning, dependency installation, and building process for you.

Usage

Starting the MCP Server

npm start

This will start the MCP server using stdio transport by default, which is suitable for integration with Claude Desktop or similar applications.

Important: After starting the server for the first time, you must authenticate with WhatsApp by using the get_qr_code tool and scanning the QR code with your phone. See the Authentication section for detailed instructions.

Development Mode

npm run dev

This starts the server in development mode with TypeScript watch mode and automatic server restarts.

Debugging with MCP Inspector

npm run debug

This launches the MCP Inspector tool, which provides a web interface for testing and debugging your MCP server. The inspector allows you to:

• View all available tools and their schemas
• Execute tools directly and see their responses
• Test your server without needing to connect it to an AI assistant
• Debug tool execution and inspect responses

Connecting to Claude Desktop

1. Create a configuration file for Claude Desktop:

   config.json

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   {
     "mcpServers": {
       "whatsapp": {
         "command": "node",
         "args": [
           "PATH_TO/dist/index.js"
         ]
       }
     }
   }
   

   Replace PATH_TO with the absolute path to the repository.