MCP — the Model Context Protocol — is an open standard for letting an AI client use an external system as a set of tools. A WhatsApp MCP server turns your inbox into those tools.
What a WhatsApp MCP server should expose
- Search across chats, with context returned alongside each hit rather than bare matches.
- Read a chat or a range of messages, including media transcripts.
- List and resolve contacts and groups.
- Send, reply and react — gated, and clearly separated from the read tools.
- Chat management: labels, mute, pin, archive, mark read.
- Task and reminder creation, so an agent can leave you something rather than messaging someone.
Scoping it so a client cannot do damage
- Two levels only: read-only and read plus write. More granularity than that goes unread.
- Server-side enforcement of per-chat modes and blocked chats — never trust the client to respect them.
- Bulk-send refusal inside the send tool, not in a prompt.
- Short-lived tokens, one per client, revocable individually.
- An audit trail of grants and revocations, even when you keep no activity logs.
Ship usage guidance with the connection
A tool list is not enough. Send compact workflow guidance along with the connection so the client knows to quote context when it answers, to confirm before sending, and to prefer search over listing everything. It measurably reduces the number of stupid tool calls.
Test it like an adversary
Before you trust a server, ask a connected client to message forty people, to read a chat you have blocked, and to delete a thread. All three should fail server-side, with a clear explanation.