vcv-rack-mcp
Enables LLMs to compose VCV Rack modular synth patches by generating plain JSON, with tools for patch creation, catalog search, and live OSC control.
README
vcv-rack-mcp
MCP server for VCV Rack 2 built around one insight: .vcv patch files are plain JSON, so an LLM can compose modular synth patches by emitting structured data — no GUI automation, ever.
Status: v0.1.0 — Webapp and Core complete. Patch generation, catalog, validation, OSC bridge, webapp dashboard, Playwright E2E tests, and agentic workflow all working. Manual gates P2 (round-trip in Rack) and P3 (OSC e2e) still need a human with Rack open.
Quick Start
git clone https://github.com/sandraschi/vcv-rack-mcp
cd vcv-rack-mcp
uv sync
uv run -m vcv_rack_mcp
Tools
| Tool | What it does |
|---|---|
vcv_patch |
Create, edit, validate, list, get, open_in_rack, rack_cycle, import patches |
vcv_catalog |
Search catalog, get module details, verify installed, library link, sideload, suggest rack |
vcv_live |
OSC address map, performance sheet for live tweaking |
vcv_agentic_workflow |
ctx.sample loop: brief → generate → validate → retry (max 3) |
show_patch_card / show_catalog_card |
Prefab UI cards |
Architecture
vcv-rack-mcp (port 10916, stdio / HTTP /mcp)
├── catalog/modules.yaml — 49 modules, 50/50 generative/performance
├── depot/ — .vcv patches + SQLite metadata + sidecar .md
└──→ osc-mcp (port 10767) — vcv_manager consumes address maps
What's Real vs What Needs Human
| Feature | Status | Gate |
|---|---|---|
| Catalog (49 modules) | Done, validated | P1 |
| Patch generation | Done, deterministic | P2 (needs Rack round-trip) |
| Validation (3 checks) | Done with tests | P2 |
| OSC address map | Done | P3 (needs osc-mcp e2e) |
| Agentic workflow | Done | P4 |
| Webapp | Done, with Playwright E2E tests | P5 |
| Tauri wrapper | Future | P5 |
Ports
- Backend: 10916 (FastMCP + FastAPI)
- Frontend: 10917 (Vite React, active)
- OSC control: delegates to osc-mcp port 10767
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