WhatsApp MCP Stream

A WhatsApp MCP server built around Streamable HTTP transport, using Baileys for WhatsApp connectivity, with a web admin UI and bidirectional media flow (upload + download).

Key points:

• Transport: Streamable HTTP at /mcp
• Engine: Baileys
• Admin UI: QR, status, logout, runtime settings
• Media: upload endpoints + /media hosting + MCP download tool

Quick Start (Docker)

# build and run

docker compose build

docker compose up -d

The server will be available at:

• Admin UI: http://localhost:3003/admin
• MCP endpoint: http://localhost:3003/mcp
• Media files: http://localhost:3003/media/<filename>

Runtime Settings

Settings can be edited in the admin UI and are persisted to SETTINGS_PATH (defaults to MEDIA_DIR/settings.json).

Supported settings:

• media_public_base_url
• upload_max_mb
• upload_enabled
• max_files_per_upload
• require_upload_token
• upload_token

Authentication

Built-in authentication is not implemented yet. In production, use a gateway that enforces auth. This project works well behind authmcp-gateway:

https://github.com/loglux/authmcp-gateway

Media Upload API

Base64 JSON:

curl -X POST http://localhost:3003/api/upload \
  -H "Content-Type: application/json" \
  -d {filename:photo.jpg,mime_type:image/jpeg,data:<base64>}

Multipart (recommended for large files):

curl -X POST http://localhost:3003/api/upload-multipart \
  -F "file=@/path/to/file.jpg"

Both return url and (if configured) publicUrl.

Upload Auth (Optional)

If require_upload_token=true, provide a token with either:

• x-upload-token: <token>
• Authorization: Bearer <token>

MCP Transport

The server exposes Streamable HTTP at /mcp.

Typical flow:

1. POST /mcp with JSON-RPC initialize
2. Use the returned mcp-session-id header for subsequent requests
3. POST /mcp for tool calls

MCP Tools

Auth

Contacts

Chats

Messages

Media

Utility

License

MIT