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GrandOrgue pipe organ simulator MCP server - MIDI bridge, organ control, sample set management, m...
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GrandOrgue pipe organ simulator MCP server - MIDI bridge, organ control, sample set management, m...
Security Report
GrandOrgue MCP is a well-structured organ control server with appropriate permissions for its purpose (MIDI control, file management, process spawning). However, several security concerns prevent a higher score: unsafe path handling in MIDI depot operations allows directory traversal attacks despite basic validation, subprocess execution for spawning GrandOrgue is present but unvalidated, and the server downloads and extracts external ZIP files from hardcoded URLs without integrity verification. Additionally, broad CORS configuration and missing authentication create exposure risks for the web API. Supply chain analysis found 10 known vulnerabilities in dependencies (0 critical, 4 high severity).
4 files analyzed · 20 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-sandraschi-grandorgue-mcp": {
"args": [
"-y",
"grandorgue-mcp-sota"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
GrandOrgue MCP
Modern Organ Console — a free control surface for the GrandOrgue pipe organ simulator.
GrandOrgue MCP gives GrandOrgue a beautiful, responsive web console + AI-agent-capable backend. It connects to GrandOrgue via MIDI and replaces its aging wxWidgets GUI with a modern React dashboard. Every stop, piston, manual, and swell pedal is controllable from any browser — or from an AI agent via MCP tools.
Built for the GrandOrgue community with gratitude for decades of free organ simulation. This is our contribution back — a modern console layer that works with any existing GrandOrgue installation and sample set.
Contents
- Quick Start
- Documentation
- README.md — this file, overview and quick start
- docs/GRANDORGUE_GUIDE.md — what GrandOrgue is, history of PC organ simulation, Hauptwerk comparison
- docs/ARCHITECTURE.md — system architecture, MIDI bridge, port layout
- docs/BACH_CATALOG.md — complete J.S. Bach organ MIDI repertoire
- docs/MIDI_SETUP.md — step-by-step MIDI configuration
- docs/MCP_TOOLS.md — AI agent tool reference
- docs/SAMPLE_SETS.md — marketplace, free sample sets, installation guide
- Ports
- Tech Stack
- License
Quick Start
Prerequisites
- GrandOrgue installed (Windows / Linux / macOS)
- uv for Python dependency management
- Node.js 20+ for the web console
One-Command Setup
# Install backend deps
just install
# Install frontend deps
just install-web
# Launch everything (backend + frontend + browser)
just web
The backend starts on port 11010 (HTTP mode), the frontend on port 11011.
Claude Desktop (stdio)
The server defaults to stdio transport for MCP clients. Build the bundle with
just mcpb and install dist/grandorgue-mcp-vX.Y.Z.mcpb in Claude Desktop.
The webapp uses HTTP mode (MCP_TRANSPORT=http), which just web sets automatically.
Manual Start
# Terminal 1 — Backend
uv run grandorgue-mcp
# Terminal 2 — Frontend (opens browser)
cd web_sota && bun run dev
First-Time Setup
- Install GrandOrgue from GitHub Releases
- Install at least one free sample set (see docs/SAMPLE_SETS.md)
- Start the MCP server (
uv run grandorgue-mcp) - Open the web console at http://127.0.0.1:11011
- From the Dashboard, click Start GrandOrgue then Connect MIDI
- GrandOrgue must be configured to use the virtual MIDI ports (see docs/MIDI_SETUP.md)
Ports
| Port | Service |
|---|---|
| 11010 | Backend (HTTP mode) — FastMCP 3.4 (/mcp) + FastAPI REST + WebSocket /ws |
| 11011 | Frontend — Vite React SPA, proxies /api → 11010 |
Tech Stack
| Layer | Technology |
|---|---|
| Backend | Python 3.12+, FastMCP 3.4, FastAPI, uvicorn |
| MIDI Bridge | mido + python-rtmidi (virtual ports) |
| Audio Engine | GrandOrgue C++ (untouched — MIDI control only) |
| Frontend | React 18, TypeScript, Tailwind CSS, Vite (Bun) |
| Linting | Ruff (Python), Biome (TypeScript) |
| Testing | pytest + Playwright e2e |
License
MIT — free for the GrandOrgue community, forever.
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