Toolpiper MCP server

ToolPiper MCP Server for macOS

400+ 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, speech 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, Codex, 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/download (free; the full local model runner has no caps and needs no account)
• Docs: https://modelpiper.com/docs/toolpiper
• Tool catalog: https://modelpiper.com/mcp-tools
• Community: https://github.com/ModelPiper/modelpiper-community

This repository is the official home for ToolPiper's MCP server manifest (server.json), the Claude Code plugin (plugins/toolpiper), and the setup guides. The ToolPiper app itself is not open source, but its privacy claims do not 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, launch it once, then connect any MCP client over Streamable HTTP. Loopback connections need no auth: no token, no OAuth step.

Download the disk image from modelpiper.com/download, or install with Homebrew:

brew tap modelpiper/tap
brew trust modelpiper/tap
brew install --cask toolpiper

The trust line is required once: Homebrew 6 refuses casks from taps outside its own until you trust them.

Claude Code, as a plugin (one server entry, nothing to configure by hand):

claude plugin marketplace add ModelPiper/toolpiper
claude plugin install toolpiper@modelpiper

Claude Code, as a manual server:

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

Any other MCP client, in its server configuration:

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

Claude Desktop, as a one-click extension: the packaged .mcpb ships with the next release. Source, build script and privacy statement are here now: desktop-extension/. It is a small Node.js forwarder that relays Claude Desktop's stdio to the same loopback server, and it serves the directory profile: the catalog minus every tool that uses an AI model to generate images, video or audio.

Installing with an AI agent? Point it at llms-install.md.

What's in the catalog

400+ tools, 5 resources, and 5 workflow prompts. Names follow (visionocr, systemwindowsnap, browser_assert). The live catalog, with per-tool documentation, is at modelpiper.com/mcp-tools.

Shortened. The full README is on GitHub.