rtfmbro-mcp: Instructions file for Claude Code

CLAUDE.md

rtfmbro-mcp CLAUDE.md is an instructions file for Claude Code from marckrenn/rtfmbro-mcp. It costs 395 tokens per session, scanned A, a copy of rtfmbro-mcp copilot-instructions.md, MIT.

Coding instructions that tell an agent to check a package’s official documentation before using it, including its exact locked version.

In plain words
What is it for?
They help verify package usage, configuration, and documentation while working on a project with a lock file.
Why use it?
They reduce errors caused by outdated assumptions about libraries and keep the agent from inspecting the codebase before it understands the dependencies.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is marckrenn/rtfmbro-mcp's own configuration. It tells Claude Code how to work on rtfmbro-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything rtfmbro-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to marckrenn/rtfmbro-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/marckrenn/rtfmbro-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/marckrenn/rtfmbro-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.

agentmods badge for rtfmbro-mcp CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/marckrenn/rtfmbro-mcp/claude-md.svg)](https://agentmods.dev/instructions/marckrenn/rtfmbro-mcp/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/marckrenn/rtfmbro-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/marckrenn/rtfmbro-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 395 This file is loaded in full into every session.
When invoked 395 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 97% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00395 $0.00395
Opus 5 $0.00198 $0.00198
Sonnet 5 $0.00079 $0.00079
Haiku 4.5 $0.00040 $0.00040

Measured 8d ago against content hash a60161200b95, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

rtfmbro-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 8d 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.

Origin

This is a copy

97% identical to rtfmbro-mcp copilot-instructions.md — 2 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.

CLAUDE.md · 26 lines

What it actually says

Instructions for Package Documentation

Package Documentation Policy

  • Before using any package, module, or library, ALWAYS consult its documentation — your internal knowledge may be outdated and could cause errors or failures.
  • Don't assume anything about the package's functionality, usage, or configuration without verifying it against the official documentation.
  • If you are unsure about a user's request that may involve a package, module, or library, ALWAYS refer to the documentation first or ask the user to provide the package name and version.

Workflow

  1. Don't immediately lookup the user's original codebase.
  2. First, Identify the package name and the EXACT pinned version (eg. "==1.0.5") from the project’s lock file (eg. uv.lock, bun.lock).
  3. Using this information fetch documentation by executing one of the provided tools:
    • get_readme
    • get_documentation_tree
    • read_files
    • search_github_repositories - Search for Github packages and repositories by topic, language, or keywords. Note, sometimes the documentation is located in a separate repository (like tailwindlabs/tailwindcss.com). Use the repo owner to search for the repo containing the documentation.
  4. Review the documentation carefully to understand:
    • Core functionality
    • Usage patterns
    • Any caveats or special instructions
  5. Reference examples from the documentation to guide your implementation.

Ecosystem Selection:

  • Use pypi for Python packages
  • Use npm for Node.js packages
  • Use spm for Swift packages
  • Use gh only as a fallback for languages not supported by the above registries (package name must be in 'owner/repo' format) or if you're unsure about the package's ecosystem. Also use gh when you don't find the package in the lock file.
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.

  1. 8d ago First seen · 26 lines · 395 tokens per session scan A a60161200b95

Subscribe to this mod's changes

rtfmbro-mcp CLAUDE.md is an instructions file published in the GitHub repository marckrenn/rtfmbro-mcp (92 stars, last pushed 1y ago), licensed MIT. It adds 395 tokens to every session, about $0.0020 per session on Opus 5. A static security scan graded it A with 0 findings. It is 97% identical to rtfmbro-mcp copilot-instructions.md, differing in 2 lines, and is treated as a copy.

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