McpMux MCP server

McpMux

One app to manage all your MCP servers across every AI client.

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The Problem

Cursor, Claude Desktop, VS Code, Windsurf — they all support MCP, but each one needs its own config file. None of them talk to each other.

┌─────────────────────────────────────────────────────────────────────────┐
│  Today: every client manages MCP servers independently                  │
│                                                                         │
│  Cursor       → config.json    → github, slack, db  + API keys         │
│  Claude       → config.json    → github, slack, db  + API keys  (dupe) │
│  VS Code      → settings.json  → github, slack, db  + API keys  (dupe) │
│  Windsurf     → config.json    → github, slack, db  + API keys  (dupe) │
│                                                                         │
│  ⚠ 4 config files  ·  4 copies of every API key  ·  all plain text     │
└─────────────────────────────────────────────────────────────────────────┘

Add a server? Edit four files. Rotate an API key? Edit four files. New machine? Start from scratch.

And those API keys? Sitting in plain-text JSON files anyone on your machine can read.

The Fix

McpMux is a desktop app that runs a local MCP gateway. You configure servers once — every AI client connects through a single URL.

┌─────────────────────────────────────────────────────────────────────────┐
│  With McpMux: one gateway, every client                                 │
│                                                                         │
│  Cursor       ─┐                                                        │
│  Claude       ─┤                  ┌──→  GitHub                          │
│  VS Code      ─┼──→  McpMux      ├──→  Slack                           │
│  Windsurf     ─┤   localhost:45818├──→  PostgreSQL                      │
│  Any client   ─┘                  └──→  + all your servers              │
│                                                                         │
│  ✓ 1 config  ·  credentials encrypted in OS keychain  ·  instant sync  │
└─────────────────────────────────────────────────────────────────────────┘

Add a server in McpMux and every connected client picks it up instantly — no restart, no manual refresh. Remove a tool or update a prompt? Every client knows immediately.

Lightweight and cross-platform — built in Rust with Tauri 2, McpMux uses minimal CPU and memory while running quietly in your system tray on Windows, macOS, and Linux.

How It Works

1. Install servers from the built-in registry — or add your own

2. Paste one config into each AI client (the last config you'll ever need):

{
  "mcpServers": {
    "mcpmux": {
      "type": "http",
      "url": "http://localhost:45818/mcp"
    }
  }
}

3. Done. Every tool from every server is available in every client, right now.

Shortened. The full README is on GitHub.