What is the mssgs MCP?
A secure, local bridge that lets AI assistants like Claude read, reply and even play games in your chats.
MCP (Model Context Protocol) is an open standard that lets AI tools talk to apps. The mssgs desktop app has a complete MCP server built in - switch it on, and AI assistants like Claude or Cursor get a secure, controlled window into your chats.
What that means in practice
Once connected, your AI assistant can actually do things in mssgs. The server offers well over a hundred tools (see the MCP reference), including:
Read & summarize
"Summarize #general in three bullets" - it reads channels, DMs, mentions and pinned messages.
Write & reply
Send messages, reply, react, edit and pin - only if you explicitly allow writing.
Play games
It can accept game invites, read the board and make real moves. Yes, really.
Calls & presence
Start or answer DM voice calls, show typing, and get live updates as they happen.
Where does it run?
Entirely on your computer. The MCP server lives inside the desktop app at 127.0.0.1 (loopback - unreachable from the internet) and only runs while the app is open and you're signed in. Your chats don't go anywhere new; the AI talks to your machine, your machine talks to mssgs.
You need the desktop app from mss.gs/downloads. The version in the Mac App Store does not include the MCP server.
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