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sandraschi

vcv-rack-mcp

by sandraschi
OverviewSchemaRelated ServersScoreDiscussions
Python
Local

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

Related MCP server: MCP Synth Controller

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

Install Server
A
license - permissive license
C
quality
B
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
–Releases (12mo)
Commit activity

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Tools

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