Borrowing it
Nothing to install: this file belongs to superiorsd10/rubberduck-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/superiorsd10/rubberduck-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/superiorsd10/rubberduck-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/superiorsd10/rubberduck-mcp/claude-md)<a href="https://agentmods.dev/instructions/superiorsd10/rubberduck-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/superiorsd10/rubberduck-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/superiorsd10/rubberduck-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/superiorsd10/rubberduck-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 | $0.02278 | $0.02278 |
| Opus 5 | $0.01139 | $0.01139 |
| Sonnet 5 | $0.00456 | $0.00456 |
| Haiku 4.5 | $0.00228 | $0.00228 |
Grade A, and why
rubberduck-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 11d 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 — 253 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 (claude.ai/code) when working with code in this repository.
You have access to two Rubberduck MCP tools: clarify() and yap().
Use clarify() when you're confused, need human input for ambiguous requirements, or aren't 100% confident about changes you're making - it will pause your work until you get a response.
Use yap() to share your thoughts, emotions, feelings, progress updates, and insights while working for an engaging experience with the human - it's non-blocking and keeps humans informed of your thinking process.
Use both tools proactively for better collaboration.
Development Commands
# Build TypeScript to JavaScript
npm run build
# Development mode with tsx
npm run dev
# Start built MCP server
npm start
# Clean build artifacts
npm run clean
# Prepare for distribution (runs build)
npm run prepare
# Prepare for npm publishing (clean + build)
npm run prepublishOnly
# Start CLI interface for human interaction (requires MCP server running in MCP compatible IDE)
npx rubberduck-mcp cli
# OR: ./bin/rubberduck cli (local dev)
Architecture Overview
This is an MCP (Model Context Protocol) tool that enables bidirectional communication between LLMs and humans through two main tools: clarification and yapping. The system has been refactored from file-based IPC to a TCP-based message broker architecture for better performance and multi-client support.
Core Architecture Components
TCP Message Broker System:
- Message Broker (
src/broker/message-broker.ts): Central TCP server on port 8765 that routes messages between MCP servers and CLIs - Broker Manager (
src/broker/broker-manager.ts): Handles automatic broker lifecycle - detects existing brokers and starts new ones when needed - Broker Client (
src/broker/broker-client.ts): TCP client that connects MCP servers and CLIs to the central broker - Message Router (
src/broker/message-router.ts): Implements clarification queuing and yap message ordering logic
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.
- 11d ago First seen · 253 lines · 2,278 tokens per session scan A 0bbcb6bc62f5
rubberduck-mcp CLAUDE.md is an instructions file published in the GitHub repository superiorsd10/rubberduck-mcp (3 stars, last pushed 1y ago), licensed MIT. It adds 2,278 tokens to every session, about $0.0114 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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