What is synthlab-mcp-server CLAUDE.md?

An MCP server that lets Claude work with electronic music and synthesizer projects. MCP is a standard way for an AI assistant to call tools, while Pure Data and VCV Rack are software environments for building sound systems and instruments.

Composing songs, creating Pure Data or VCV Rack patches, mapping MIDI controllers, controlling live synthesizers, and parsing or validating Pure Data patch files.

It brings music-patch creation and hardware-control tasks into the assistant instead of requiring every patch or MIDI setup to be assembled manually. It also checks the structure of Pure Data patches.

How j0KZ/synthlab-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to j0KZ/synthlab-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/j0KZ/synthlab-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/j0KZ/synthlab-mcp-server

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/j0kz/synthlab-mcp-server/claude-md/github.svg)](https://agentmods.dev/instructions/j0kz/synthlab-mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/j0kz/synthlab-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/j0kz/synthlab-mcp-server/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/j0kz/synthlab-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/j0kz/synthlab-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,509 This file is loaded in full into every session.

When invoked 2,509 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.02509	$0.02509
Opus 5.5	$0.01004	$0.01004
Sonnet 5.5	$0.00502	$0.00502
Haiku 4.5	$0.00251	$0.00251

Measured 2mo ago against content hash 07a7e871d6ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

synthlab-mcp-server CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 188 lines

How it starts

The opening of the file, as written. The whole thing — 188 lines — stays where its author put it; the contents beside it link to each section on GitHub.

synthlab-mcp-server

Project Overview

MCP server that turns Claude into a synthesis workstation — compose songs, generate Pure Data & VCV Rack patches, map MIDI controllers, and control live synths. Targets Pd-vanilla compatible patches with focus on MIDI workflows.

Architecture

Runtime: Node.js (TypeScript), ES2022 target, ESM modules
MCP SDK: @modelcontextprotocol/sdk with stdio transport
Communication with Pd: OSC (native dgram) and FUDI (native net) — zero external network deps
Patch parsing: Custom parser for .pd text format (src/core/parser.ts)
VCV Rack: Registry of 19 plugins (~600 modules) auto-scraped from C++ source

Directory Structure

synthlab-mcp-server/
├── src/
│   ├── index.ts              # MCP server entry — 10 tools + 1 prompt
│   ├── types.ts              # PdPatch, PdCanvas, PdNode, PdConnection
│   ├── constants.ts          # Format constants, layout defaults
│   ├── core/
│   │   ├── parser.ts         # .pd text → AST
│   │   ├── serializer.ts     # AST → .pd text + buildPatch()
│   │   ├── object-registry.ts # ~95 Pd-vanilla objects with port counts
│   │   └── validator.ts      # 8 structural checks
│   ├── schemas/              # 7 Zod input validation schemas
│   ├── tools/                # 10 MCP tool handlers
│   │   ├── parse.ts          # parse_patch
│   │   ├── generate.ts       # generate_patch
│   │   ├── validate.ts       # validate_patch
│   │   ├── analyze.ts        # analyze_patch
│   │   ├── template.ts       # create_from_template
│   │   ├── rack.ts           # create_rack
│   │   ├── control.ts        # send_message
│   │   ├── list-vcv.ts       # list_vcv_modules
│   │   ├── vcv.ts            # generate_vcv
│   │   └── compose.ts        # compose_patch
│   ├── templates/            # 11 parameterized instruments
│   │   ├── index.ts          # Template registry + dispatcher
│   │   ├── modules/          # Reusable: oscillator, filter, vca, envelope, delay, reverb
│   │   └── (synth|sequencer|drum-machine|reverb|mixer|clock|chaos|maths|turing-machine|granular|bridge).ts
│   ├── composer/             # Song composition engine
│   │   ├── presets.ts        # 9 genre presets
│   │   ├── moods.ts          # 7 mood adjustments
│   │   ├── scales.ts         # 10 scales × 12 keys
│   │   ├── wiring-rules.ts   # Auto-wiring (clock→seq/drums→synth→mixer→fx)
│   │   └── song-mapper.ts    # SongSpec → CreateRackInput
│   ├── controllers/          # MIDI controller integration
│   │   ├── auto-mapper.ts    # 4-phase auto-mapping
│   │   ├── pd-controller.ts  # Input controller patch
│   │   ├── pd-output-controller.ts
│   │   ├── param-injector.ts # Parameter bus injection
│   │   └── k2-deck-config.ts # K2 LED config (JSON)
│   ├── devices/              # Hardware profiles: k2, microfreak, tr8s
│   ├── vcv/                  # VCV Rack generator
│   │   ├── generator.ts      # Module resolution + cable wiring
│   │   ├── positioner.ts     # Left-to-right HP layout
│   │   ├── registry.ts       # Plugin lookup + fuzzy matching
│   │   └── registry/         # 19 auto-generated plugin registries
│   ├── wiring/
│   │   └── bus-injector.ts   # throw~/catch~ (audio), send/receive (control)
│   └── network/              # Zero external deps
│       ├── osc-encoder.ts    # OSC 1.0 binary encoder (dgram)
│       ├── fudi-formatter.ts # FUDI text formatter
│       ├── udp-sender.ts     # UDP fire-and-forget
│       └── tcp-sender.ts     # TCP send/receive
├── scripts/
│   ├── build-vcv-registry.ts # Clone repos → parse C++ → generate .ts
│   ├── parse-cpp-enums.ts    # C++ enum parser
│   ├── parse-svg-width.ts    # SVG panel → HP conversion
│   └── update-readme-stats.ts
├── tests/                    # 34 test files, 741 tests
├── docs/                     # PRD, Architecture, Rules, Plan, Scaffold
├── .github/workflows/ci.yml  # Node 18/20/22 matrix + npm publish
├── package.json
├── tsconfig.json
└── CLAUDE.md

Read the full file on GitHub · 188 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 188 lines · 2,509 tokens per session scan A 07a7e871d6ed

Subscribe to this mod's changes

synthlab-mcp-server CLAUDE.md is an instructions file published in the GitHub repository j0KZ/synthlab-mcp-server (5 stars, last pushed 8mo ago), licensed MIT. It adds 2,509 tokens to every session, about $0.0100 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Creative and media audio mcp midi pure-data vcv-rack

synthlab-mcp-server CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
synthlab-mcp-server CLAUDE.mdj0KZ/synthlab-mcp-server	Instructions file	5	8mo ago	MIT	A	2,509	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	today	MIT	A	7,461	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	5,685	GitHub Copilot
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	today	MIT	A	3,086	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	280k	2d ago	MIT	A	4,325	Codex, OpenCode

synthlab-mcp-server: Instructions file for Claude Code