ToolPiper — MCP Server for macOS

300+ Model Context Protocol tools, all running on-device. ToolPiper is a native macOS app that turns your Mac into a local AI platform: bundled inference (llama.cpp on Metal, Apple Intelligence, voice on the Neural Engine), an OpenAI-compatible API at localhost:9998, and a built-in MCP server that exposes the whole machine to any MCP client — Claude Code, Cursor, Windsurf, or your own scripts.

No cloud. No Docker. No Python. No API keys. Nothing leaves your Mac, and you can verify that yourself: lsof -i -P | grep ToolPiper while it runs.

• Website: https://modelpiper.com/toolpiper
• Download: https://modelpiper.com (free — the full local model runner has no caps and needs no account)
• Docs: https://modelpiper.com/docs/toolpiper
• Community: https://github.com/ModelPiper/modelpiper-community

This repository is the official home for ToolPiper's MCP server manifest, setup guides, and recipes. The ToolPiper app itself is not open source — but its privacy claims don't ask for trust: every byte of network traffic is observable on your own machine. Open-source siblings live in this org: PiperSR (ANE super-resolution model), FluidAudio, mlx-audio-swift.

Quick start

Install ToolPiper from modelpiper.com, launch it once, then connect any MCP client.

Streamable HTTP (zero config — loopback connections need no auth):

claude mcp add --transport http toolpiper http://127.0.0.1:9998/mcp

{
  "mcpServers": {
    "toolpiper": { "type": "http", "url": "http://127.0.0.1:9998/mcp" }
  }
}

stdio (the ~/.toolpiper/mcp symlink is created automatically on launch):

claude mcp add toolpiper -- ~/.toolpiper/mcp

{
  "mcpServers": {
    "toolpiper": { "type": "stdio", "command": "/Users/<you>/.toolpiper/mcp" }
  }
}

What's in the catalog

300+ tools, 5 resources, and 5 workflow prompts. Names follow <category>_<action> (vision_ocr, system_window_snap, browser_assert). The full catalog ships names-only on the wire (~24 KB), so it fits under Claude Code's per-server payload cap without trimming.

Resources: toolpiper://status, toolpiper://models, toolpiper://backends, toolpiper://tests, toolpiper://categories Prompts: `setup-mo

... View full README on GitHub