Borrowing it
Nothing to install: this file belongs to websitebutlers/cleanroom-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.
curl -O https://raw.githubusercontent.com/websitebutlers/cleanroom-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/websitebutlers/cleanroom-mcpWrote 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/websitebutlers/cleanroom-mcp/claude-md)<a href="https://agentmods.dev/instructions/websitebutlers/cleanroom-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/websitebutlers/cleanroom-mcp/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/websitebutlers/cleanroom-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/websitebutlers/cleanroom-mcp/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 | $0.00904 | $0.00904 |
| Opus 5 | $0.00452 | $0.00452 |
| Sonnet 5 | $0.00181 | $0.00181 |
| Haiku 4.5 | $0.00090 | $0.00090 |
Grade A, and why
cleanroom-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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cleanroom MCP Server
What This Project Is
An MCP (Model Context Protocol) server that enforces the clean-room software reimplementation process. AI coding agents connect to this server and receive role-gated access to tools — an analyst agent gets spec-writing tools, an implementer agent gets coding tools, and neither can cross the information barrier. Every action is automatically logged to a tamper-evident audit trail.
See the README and docs/getting-started.md for usage documentation.
Project Structure
src/
├── server.ts # MCP server entry point + CLI
├── tools/ # MCP tool definitions (one file per domain)
│ ├── project.ts # cleanroom_init, cleanroom_status
│ ├── spec.ts # cleanroom_spec_create, _read, _list, _submit
│ ├── review.ts # cleanroom_spec_review, _handoff
│ ├── implement.ts # cleanroom_impl_read_spec, _run_tests
│ ├── verify.ts # cleanroom_verify_run, _report
│ ├── audit.ts # cleanroom_audit_log, _verify, _export
│ └── team.ts # cleanroom_team_add, _list, cleanroom_attest, cleanroom_ai_log
├── resources/ # MCP Resource providers
│ └── specs.ts # Specs + project status resources
├── prompts/ # MCP Prompt templates (analyst, implementer, monitor)
├── core/ # Shared business logic
│ ├── access-control.ts # Role-based gating middleware
│ ├── audit-engine.ts # Hash-chained append-only log
│ ├── config.ts # Project config (YAML) management
│ ├── spec-engine.ts # Spec lifecycle (create, submit, review, handoff)
│ └── types.ts # Shared TypeScript types and Zod schemas
├── templates/ # Spec templates (markdown files)
└── dashboard/ # Web UI
├── server.ts # Express server + auth
├── api.ts # REST API routes
├── sse.ts # Server-Sent Events
├── auth.ts # Token generation
└── views/ # HTML pages
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.
- 9d ago First seen · 79 lines · 904 tokens per session scan A c110cb283ece
cleanroom-mcp CLAUDE.md is an instructions file published in the GitHub repository websitebutlers/cleanroom-mcp (2 stars, last pushed 5mo ago), licensed MIT. It adds 904 tokens to every session, about $0.0045 per session on Opus 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.
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