MCP server for Supertonic 3 on-device text-to-speech
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# supertonic3-mcp Local, on-device TTS for Claude & Cursor, powered by Supertonic 3. No API key. No cloud. An internal tool open-sourced by [Halozen](https://halozen.ai) — we build AI compliance intelligence for construction. *Not affiliated with Supertone Inc.* Expose `speak`, `list_voices`, and `list_expressions` to Claude Desktop, Cursor, or any MCP client over **STDIO**. ## Quick start (TTHW < 3 min) ```bash git clone https://github.com/nextic-tech/supertonic3-mcp && cd supertonic3-mcp python3 -m venv .venv && source .venv/bin/activate pip install -e ".[dev]" # Optional: pre-download model for offline use (~400MB) supertonic3-mcp preload # Run MCP server (STDIO) supertonic3-mcp ``` ### Cursor MCP config Add to `.cursor/mcp.json` (or Cursor Settings → MCP): ```json { "mcpServers": { "supertonic3": { "command": "/absolute/path/to/supertonic-tts/.venv/bin/supertonic3-mcp", "args": [] } } } ``` First server start downloads the Supertonic model into `~/.cache/supertonic3/` unless you ran `preload` first. ## Tools | Tool | Description | |------|-------------| | `speak` | Synthesize text to a WAV file; returns absolute path + metadata | | `list_voices` | Built-in voices (`voice_id`, `gender`) | | `list_expressions` | Inline tags (`<laugh>`, `<breath>`, …) with descriptions | ### `speak` parameters - `text` — 1–5000 characters; expression tags allowed - `voice_id` — optional (`M1`, `F1`, …) - `language` — ISO 639-1 (`en`, `ko`, `ja`, …). **For non-English text, always set `language=`.** Defaults to `en`. - `speed` — `0.7` to `2.0` (SDK range) - `play` — if `true`, plays audio on **this machine** via `afplay` (macOS) or `aplay` (Linux). Unsupported on Windows. WAV files are written to `/tmp/supertonic_*.wav` (macOS/Linux). Windows is not supported for synthesis output paths in v1.0. Example return: ```text Audio saved to /tmp/supertonic_abc123.wav (1.4s, voice: M1, lang: en) ``` ## Performance (this repo) Measured on Apple M3,…
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