Borrowing it
Nothing to install: this file belongs to luumenlabs/code. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/luumenlabs/code/main/CLAUDE.mdgit clone --depth 1 https://github.com/luumenlabs/codeWrote 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.
[](https://agentmods.dev/instructions/luumenlabs/code/claude-md)<a href="https://agentmods.dev/instructions/luumenlabs/code/claude-md"><img src="https://agentmods.dev/badge/instructions/luumenlabs/code/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.
<a href="https://agentmods.dev/instructions/luumenlabs/code/claude-md"><img src="https://agentmods.dev/badge/instructions/luumenlabs/code/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00346 | $0.00346 |
| Opus 5.5 | $0.00138 | $0.00138 |
| Sonnet 5.5 | $0.00069 | $0.00069 |
| Haiku 4.5 | $0.00035 | $0.00035 |
Grade A, and why
code 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.
This is a copy
100% identical to code AGENTS.md — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Luu Code — notes for coding agents
House style
Comments are short. One or two lines. They explain why — the constraint that made the obvious approach wrong, the failure being defended against — and only where the next person would otherwise undo the code. Do not argue a case, do not compare the approach to the one not taken, do not narrate what the next line plainly does. A paragraph justifying a decision is a paragraph nobody reads. Match the density of the file you are editing.
User-facing text is shorter. Labels, descriptions, tooltips, and errors say what the thing is or what to do next. They never explain a reason, a trade-off, or how anything works underneath. "Always on — this is how an agent reports what is wrong" is already at the limit; anything longer belongs nowhere.
Documentation describes what is, not what was considered. No rationale for picking a library, no defence of an architecture, no history. Say how the thing behaves and what will break if you change it.
- Fail clearly. Every Roblox-facing failure carries a code an agent can act on and, where possible, a hint naming what to try instead.
- Never report a partial success as a success.
- Do not guess at a target. Ambiguity is an error, not a coin flip.
- Probe capabilities rather than assuming them; Studio differs by version, platform, and run state.
- Prefer a structured Studio API over desktop automation when both would work.
- Keep the surface small. The product is the Studio connection, not a general local coding environment.
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 · 30 lines · 346 tokens per session scan A 8844afc3c530
code CLAUDE.md is an instructions file published in the GitHub repository luumenlabs/code (2 stars, last pushed 2mo ago), licensed MIT. It adds 346 tokens to every session, about $0.0014 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to code AGENTS.md, differing in 0 lines, and is treated as a copy.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
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langchain AGENTS.md
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vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.