weixin-mcp

Send and receive WeChat messages, list contacts, and manage a listening daemon via the CLI tool npx weixin-mcp.

Send and receive WeChat messages (text, images, files, videos) via the weixin-mcp CLI. Use when the user asks to send WeChat messages, check WeChat inbox, or set up WeChat bot integration.

Source: github.com/bkmashiro/weixin-mcp
npm: weixin-mcp

Prerequisites

No installation needed — uses npx weixin-mcp@^1.7 directly (version pinned for security).

Security Notes

• Token storage: Login tokens are stored locally in accounts/<id>.json. These are sensitive credentials.
• Webhook URLs: Only use trusted, local URLs (e.g., http://localhost:...). External webhooks will receive message content including context tokens.
• Data directory: Set WEIXIN_MCP_DIR to control where credentials are stored.

Quick Reference

# Check if logged in
npx weixin-mcp@^1.7 status

# Login (scan QR code)
npx weixin-mcp@^1.7 login

# Send message (supports short ID prefix)
npx weixin-mcp@^1.7 send <userId> "message text"

# Poll for new messages (one-shot)
npx weixin-mcp@^1.7 poll

# Watch for messages (continuous)
npx weixin-mcp@^1.7 poll --watch

# List contacts (users who messaged the bot)
npx weixin-mcp@^1.7 contacts

# Start HTTP daemon with webhook push (localhost only recommended)
npx weixin-mcp@^1.7 start --port 3001 --webhook http://localhost:18789/webhook/weixin

# Stop daemon
npx weixin-mcp@^1.7 stop

# View daemon logs
npx weixin-mcp@^1.7 logs -f

First-Time Setup Flow

1. Check status: npx weixin-mcp@^1.7 status
2. If not logged in, tell user:

   请扫码登录微信 bot：
   npx weixin-mcp@^1.7 login
   终端会显示二维码，用微信扫码确认即可。
   

3. After login, optionally start daemon with webhook for real-time messages

Sending Messages

# Text message (short prefix if unique in contacts)
npx weixin-mcp@^1.7 send abc12 "你好"

# Image (via MCP tool)
# weixin_send_image: to, source (file path or URL), caption (optional)

# File (via MCP tool)  
# weixin_send_file: to, source, caption (optional)

If you don't know the userId, first npx weixin-mcp@^1.7 contacts to list known users, or npx weixin-mcp@^1.7 poll --reset to fetch recent messages and extract sender IDs.

MCP Tools

Tool	Description
weixin_send	Send text message
weixin_send_image	Send image (local path or URL)
weixin_send_file	Send file attachment
weixin_poll	Poll for new messages
weixin_contacts	List contacts
weixin_get_config	Get bot config

Receiving Messages

Option A: Webhook (Real-Time, localhost only)

⚠️ Security: Only use localhost or trusted internal URLs for webhooks.

npx weixin-mcp@^1.7 start --webhook http://localhost:18789/webhook/weixin

Webhook receives POST with:

{
  "event": "weixin_messages",
  "messages": [{
    "from_user_id": "...",
    "message_type": 1,
    "item_list": [{"type": 1, "text_item": {"text": "..."}}],
    "context_token": "..."
  }],
  "timestamp": "..."
}

Option B: Polling

# One-shot
npx weixin-mcp@^1.7 poll

# Continuous watch (blocking)
npx weixin-mcp@^1.7 poll --watch

Multi-Account Setup

Run separate instances with different data directories and ports:

# Account A
WEIXIN_MCP_DIR=~/.weixin-mcp-alice npx weixin-mcp@^1.7 login
WEIXIN_MCP_DIR=~/.weixin-mcp-alice npx weixin-mcp@^1.7 start --port 3001 --webhook http://localhost:3001/hook

# Account B
WEIXIN_MCP_DIR=~/.weixin-mcp-bob npx weixin-mcp@^1.7 login
WEIXIN_MCP_DIR=~/.weixin-mcp-bob npx weixin-mcp@^1.7 start --port 3002 --webhook http://localhost:3002/hook

MCP Server Integration (Claude Desktop / Cursor)

For stdio MCP mode (single-client):

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "weixin": { "command": "npx", "args": ["weixin-mcp@^1.7"] }
  }
}

Data Storage

Default paths (in priority order):

1. $WEIXIN_MCP_DIR/ (if set)
2. ~/.openclaw/openclaw-weixin/ (if OpenClaw installed)
3. ~/.weixin-mcp/

Files:

• accounts/<id>.json — login token (⚠️ sensitive)
• accounts/<id>.cursor.json — message cursor
• contacts.json — contact book
• daemon.json — daemon PID
• daemon.log — daemon logs

Troubleshooting

Login expired / token invalid:

npx weixin-mcp@^1.7 login  # Re-scan QR code

Duplicate @im.wechat in userId:

npx weixin-mcp@^1.7 accounts clean  # Removes old duplicates

Check daemon status:

npx weixin-mcp@^1.7 status
npx weixin-mcp@^1.7 logs