Supertonic3 Mcp

What it does

Give your AI assistant a voice — locally, with no API key and no cloud calls. supertonic3-mcp wraps Supertonic 3 on-device TTS as three MCP tools your AI assistant (Claude Desktop, Cursor, or any MCP client) can call directly.

Tools

Key features

• No API key — runs entirely on your machine
• No cloud — model weights cached locally (~400MB, downloads once)
• 10 voices — M1–M5, F1–F5
• 31 language codes — en, ko, ja, fr, and more
• Inline expression tags — <laugh>, <pause>, <breath>, and 7 more
• ~820ms warm synthesis on Apple M3 Air
• FastMCP + asyncio — inference serialized behind asyncio.Lock; playback runs outside the lock

Quick start

git clone https://github.com/nextic-tech/supertonic3-mcp
cd supertonic3-mcp
pip install -e .
supertonic3-mcp preload  # optional: pre-download model

Add to your MCP config:

{
  "mcpServers": {
    "supertonic3": {
      "command": "/absolute/path/to/supertonic3-mcp/.venv/bin/supertonic3-mcp",
      "args": []
    }
  }
}

License

MIT (code) · model weights © Supertone Inc. under OpenRAIL-M