Wappmcp

npm version Publish to NPM License: MIT

wappmcp is an open-source WhatsApp Web CLI and stdio MCP server built on top of whatsapp-web.js, commander, and @modelcontextprotocol/sdk.

It lets MCP-compatible clients read WhatsApp data, send and manage messages, and optionally subscribe to incoming WhatsApp events through an MCP notification channel.

Highlights

• Exposes WhatsApp as an MCP server over stdio.
• Supports interactive configuration via wappmcp configure.
• Provides read tools for chats, contacts, messages, status, and account details.
• Includes mutating tools for sending, replying, reacting, editing, deleting, forwarding, and typing.
• Can emit incoming message events over an optional MCP notification channel.
• Stores local app data under ~/.wappmcp/.

Requirements

• Node.js 24+
• A local Chrome or Chromium installation that puppeteer can launch

If browser auto-detection does not work in your environment, set either WAPPMCP_BROWSER_PATH or PUPPETEER_EXECUTABLE_PATH.

Installation

Use it without installing globally:

npx wappmcp configure

Or with Bun:

bunx wappmcp configure

If you prefer a global install:

npm install -g wappmcp

For local development:

npm install
npm run build
npm run dev -- configure

Quick Start

1. Run the interactive configuration:

npx wappmcp configure

This lets you:

• connect WhatsApp (including QR scan when required)
• disconnect and remove local session data
• manage allowlist.users and allowlist.chats

Configuration is saved to:

~/.wappmcp/config.json

2. Start the MCP server:

npx wappmcp mcp

3. If your MCP host supports notifications and you want incoming WhatsApp events, enable channels:

npx wappmcp mcp --channels

The server uses stdio, so it is meant to be launched by an MCP client or wrapper rather than browsed directly in a terminal.

CLI Usage

Configure

npx wappmcp configure
bunx wappmcp configure

Opens an interactive configure UI (Ink) to manage WhatsApp connection and event allowlist. WhatsApp Web opens in a visible browser window by default; pass --headless to run it without one.

• connect/disconnect session
• Allowed users
• Allowed chats

Allowed users/chats screens support live type-to-filter search. Large lists are shown in a 5-row scroll viewport, with Back kept as a persistent utility row.

Everything is persisted to:

~/.wappmcp/config.json

Session data always lives at:

~/.wappmcp/profile

MCP Server

npx wappmcp mcp
bunx wappmcp mcp

Starts the stdio MCP server for the configured WhatsApp session. WhatsApp Web opens in a visible browser window by default; pass --headless to run it without one.

Optional channel support:

npx wappmcp mcp --channels

MCP Tools

The server currently exposes these tools:

• whatsapp_get_me
• whatsapp_get_status
• whatsapp_list_chats
• whatsapp_get_chat
• whatsapp_get_chat_participants
• whatsapp_get_chat_messages
• whatsapp_search_messages
• whatsapp_get_message
• whatsapp_list_contacts
• whatsapp_get_contact
• whatsapp_search_contacts
• whatsapp_get_contact_lid
• whatsapp_lookup_number
• whatsapp_send_message
• whatsapp_send_media_from_base64
• whatsapp_send_media_from_path
• whatsapp_reply_to_message
• whatsapp_react_to_message
• whatsapp_edit_message
• whatsapp_delete_message
• whatsapp_forward_message
• whatsapp_send_typing

Push Channel

When started with --channels, the server:

• advertises the experimental MCP capability hooman/channel
• advertises hooman/user with path meta.user
• advertises hooman/session with path meta.session
• advertises hooman/thread with path meta.thread
• advertises hooman/channel/permission for remote daemon approvals
• emits notifications/hooman/channel for incoming WhatsApp message events

If allowlist entries are configured, notifications/hooman/channel events are emitted only when either:

• meta.session (chat ID) is in allowlist.chats, or
• meta.user (sender ID) is in allowlist.users

When no allowlist is configured (or both arrays are empty), all inbound channel events are emitted.

Each notification includes:

• content: a JSON-encoded event payload
• meta.source: always whatsapp
• meta.user: the sender identity seed for the incoming message
• meta.session: the chat identity seed for the incoming message
• meta.thread: the WhatsApp message ID for the incoming message

The JSON-decoded content payload includes:

• source
• self
• message
• text

If the incoming message or its quoted parent contains media, attachments are downloaded and included in the emitted event payload. Files are stored under ~/.wappmcp/attachments/.

When Hooman sends notifications/hooman/channel/permission_request, wappmcp posts the request and its approval option labels back into the originating WhatsApp chat and waits for a reply to that exact message. Replies are matched case-insensitively against option IDs and labels, ignoring separators such as spaces, hyphens, and underscores; wappmcp relays the matching option ID over notifications/hooman/channel/permission.

Local Data

wappmcp stores local state under ~/.wappmcp/:

• profile/ for WhatsApp session data
• config.json for allowlist configuration
• attachments/ for downloaded incoming media attachments
• .wwebjs_cache/ for WhatsApp Web version cache data

Notes

• This project uses WhatsApp Web under the hood, so the first login must be completed by scanning a QR code.
• Some device metadata is unavailable on multi-device sessions.
• Incoming notification channels depend on MCP host support.

License

MIT. See LICENSE.