Claude in your WhatsApp DMs, via a Go-Python bridge

What it does

A Go bridge logs into your personal WhatsApp account via the Web multi-device API and syncs messages into a local SQLite database. A Python MCP server sits on top, exposing that data to Claude (or any MCP client) through a set of read and write tools. You can search contacts, retrieve chat history with context, send text or media, and download attachments—all without a cloud intermediary.

The interesting bit

The project keeps your archive local by default and only ships data to the LLM when it explicitly calls a tool, which is a rare privacy-first stance for an LLM bridge. The README even cites Simon Willison’s “lethal trifecta” warning, openly admitting that prompt injection could still exfiltrate your private chats.

Key highlights

• Connects directly to WhatsApp using the whatsmeow library; no business API or third-party servers required.
• Stores message history in a local SQLite database and gates LLM access behind explicit MCP tool calls.
• Supports two-way media: send images, video, documents, and voice messages (with optional FFmpeg conversion), plus download received media by message_id.
• Exposes a dozen tools including contact search, message context retrieval, and group messaging.
• Runs entirely offline as two local processes: a Go bridge for the WhatsApp connection and a Python server for the MCP layer.

Caveats

• Authentication requires scanning a QR code and may need re-authentication after roughly 20 days.
• Windows builds need CGO enabled for go-sqlite3, which requires installing a C compiler toolchain.
• The README explicitly warns that prompt injection could lead to private data exfiltration—the “lethal trifecta” of MCP servers.

Verdict

Worth a look if you want an AI assistant that can read and reply to your WhatsApp threads without handing your chat history to a cloud provider. Skip it if you’re not comfortable with an LLM having tool access to your personal messages, or if occasional database deletion and re-authentication sounds like a hobby you didn’t ask for.