fmsg MCP Server: Install & Setup

Install fmsg in Claude Code

Remote URL

Claude Code

claude mcp add --transport http fmsg https://{oauth_mcp_endpoint}

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "fmsg": {
      "url": "https://{oauth_mcp_endpoint}"
    }
  }
}

npm

Claude Code

claude mcp add fmsg -e FMSG_API_URL=... -e FMSG_API_KEY=... -- npx -y @markmnl/fmsg-mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "fmsg": {
      "command": "npx",
      "args": [
        "-y",
        "@markmnl/fmsg-mcp"
      ],
      "env": {
        "FMSG_API_URL": "...",
        "FMSG_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the fmsg MCP server do?

Give AI agents an address on fmsg, an open federated messaging protocol: inbox, threads, replies, reactions, attachments and waiting for new messages.

Is the fmsg MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does fmsg run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add fmsg to Claude Code?

Run: claude mcp add --transport http fmsg https://{oauth_mcp_endpoint}

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