What is lacylights-mcp CLAUDE.md?

Instructions for LacyLights MCP, a server that lets AI assistants control theatrical lighting systems using natural-language requests. It connects assistants to lighting fixtures, scenes, and cues through the LacyLights system.

Running the development server, compiling and starting the production build, testing lighting-control tools, and checking code quality.

They explain how to develop, build, test, and maintain the bridge between an AI assistant and the lighting-control backend.

How bbernstein/lacylights-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to bbernstein/lacylights-mcp. 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/bbernstein/lacylights-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/bbernstein/lacylights-mcp

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

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Per session 2,921 This file is loaded in full into every session.

When invoked 2,921 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	$0.02921	$0.02921
Opus 5.5	$0.01168	$0.01168
Sonnet 5.5	$0.00584	$0.00584
Haiku 4.5	$0.00292	$0.00292

Measured 25d ago against content hash 0996d2f9e766, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

lacylights-mcp 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 25d 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 · 275 lines

How it starts

The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code when working with code in this repository.

Project Overview

LacyLights MCP is a Model Context Protocol (MCP) server that enables AI-powered theatrical lighting design. It acts as a bridge between AI assistants (like Claude) and the LacyLights lighting control system, providing natural language control of DMX fixtures, scene generation, and cue management.

Role in LacyLights Ecosystem:

AI integration layer for the LacyLights system
Provides 80+ MCP tools for lighting control
Connects AI assistants to the lacylights-go backend
Enables natural language scene generation and script analysis

Development Commands

Development

npm run dev              # Start dev server with auto-reload (tsx watch)
npm run build            # Compile TypeScript to dist/
npm start                # Run production build from dist/

Testing

npm test                 # Run all tests
npm run test:watch       # Run tests in watch mode
npm run test:coverage    # Generate coverage report

Code Quality

npm run lint             # Check for linting errors
npm run lint:fix         # Fix auto-fixable linting errors

Architecture

Directory Structure

lacylights-mcp/
├── src/
│   ├── index.ts              # Main entry point, MCP protocol handler
│   ├── tools/                # MCP tool implementations
│   │   ├── project-tools.ts  # Project CRUD operations
│   │   ├── fixture-tools.ts  # Fixture management
│   │   ├── look-tools.ts     # Look generation and control
│   │   └── cue-tools.ts      # Cue sequence and playback
│   ├── services/             # Core services
│   │   ├── graphql-client-simple.ts  # Apollo client for backend
│   │   ├── ai-lighting.ts    # OpenAI integration
│   │   └── rag-service-simple.ts     # Pattern matching service
│   └── types/
│       └── lighting.ts       # TypeScript interfaces
├── tests/                    # Test files (mirrors src/)
├── run-mcp.js               # MCP client integration wrapper
└── dist/                    # Compiled output

Read the full file on GitHub · 275 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.

25d ago Changed · +27 lines · +511 tokens per session 0996d2f9e766
27d ago Changed · +1 lines · +55 tokens per session 486f00e428e3
28d ago Changed · +19 lines · +329 tokens per session b92cc9a5ce14
29d ago Changed · +2 lines · +41 tokens per session 71ee26dc0300
2mo ago First seen · 226 lines · 1,985 tokens per session scan A 8a0c3b7f487f

Subscribe to this mod's changes

lacylights-mcp CLAUDE.md is an instructions file published in the GitHub repository bbernstein/lacylights-mcp (16 stars, last pushed 3d ago), licensed MIT. It adds 2,921 tokens to every session, about $0.0117 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 2026-08-30.

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lacylights-mcp: Instructions file for Claude Code