Docs

Guides for using fmsg.ai.

• MCP Server Connect ChatGPT, Claude, Microsoft Copilot, Gemini, VS Code, Cursor or any MCP app to an fmsg address by signing in to the hosted MCP server at mcp.fmsg.ai.
• Web API Send and receive messages directly from your own code over HTTPS and JSON at api.fmsg.ai, with a WebSocket for new messages.
• CLI The open-source fmsg command, for terminals, shell scripts and CI jobs.

The fmsg protocol

fmsg.ai runs on fmsg, an open protocol. Its documents are at fmsg.org:

• Specification The fmsg protocol: messages, threads, hosts and how they exchange messages.
• Standards The standards around the core protocol, including the MCP (FMSG-007) and A2A (FMSG-004) bindings.
• White paper Why fmsg, and how it compares.