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repl-mcp CLAUDE.md

repl-mcp CLAUDE.md is an instructions file for coding agents from simm-is/repl-mcp. It costs 2,355 tokens per session, scanned A, original, MIT.

A set of instructions for working on repl-mcp, an MCP server for Clojure development. MCP is a way for an AI agent to use tools provided by another program, while a REPL is an interactive Clojure environment for trying code.

In plain words
What is it for?
Use it when developing or maintaining Clojure code through repl-mcp. It covers interactive evaluation, project and code linting, test generation and execution, targeted tests and structural refactoring.
Why use it?
It defines a consistent workflow for evaluating code, reloading edits, linting, testing, debugging and refactoring. This helps developers get quick feedback while keeping the running REPL useful.

Instructions file

not rated 44 8mo ago A scan 2,355 tokens original MIT
View the source file simm-is/repl-mcp
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add instructions/simm-is/repl-mcp/claude-md
Clone the repo
git clone --depth 1 https://github.com/simm-is/repl-mcp

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.

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/simm-is/repl-mcp/claude-md.svg)](https://agentmods.dev/instructions/simm-is/repl-mcp/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/simm-is/repl-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/simm-is/repl-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 2,355 This file is loaded in full into every session.
When invoked 2,355 The same file — it is already loaded in full.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.02355 $0.02355
Opus 5 $0.01177 $0.01177
Sonnet 5 $0.00471 $0.00471
Haiku 4.5 $0.00235 $0.00235

Measured 5d ago against content hash 4a3a3710cf9a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

repl-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 5d 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 · 303 lines

How it starts

The opening of the file, as written. The whole thing — 303 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.

Overview

This MCP server is built on mcp-toolkit providing a clean, simplified architecture with minimal dependencies. All 51 tools follow consistent patterns for reliability and ease of use.

Instructions

  1. Interactive Development: Use the MCP tools for Clojure development in preference to default text editing. Start with eval to test code interactively before committing changes.
  2. Code Quality: Use lint-code for immediate feedback during development, lint-project for comprehensive checks, and setup-clj-kondo to initialize linting in new projects.
  3. File Management: When adding new code, use the standard Edit tool followed by load-file to reload changes into the REPL. This maintains REPL state while updating code.
  4. Refactoring: Use structural editing tools for complex refactoring to maintain code integrity. Fall back to Edit + load-file if issues arise.
  5. Testing: Use create-test-skeleton for comprehensive test generation, test-all for full test runs, and test-var-query for targeted testing.
  6. Debugging: Apply direct fixes for obvious issues. For complex problems, use systematic investigation with appropriate tools.
  7. Dependencies: Use add-libs for runtime dependency addition (Clojure 1.12+), sync-deps after updating deps.edn, and check-namespace to verify availability.

Workflow Philosophy

Simple, Direct, Effective: The mcp-toolkit foundation enables straightforward tool usage with consistent patterns and reliable error handling.

Tool Selection Principles:

  • Use the most direct tool for the task
  • All tools follow the same pattern: input → processing → structured output
  • Error handling is built-in - tools return clear error messages
  • No complex state management - each tool call is independent

Tool Categories

Evaluation (2 tools)

  • eval - Execute code in REPL with proper namespace context
  • load-file - Load files to update REPL state

Read the full file on GitHub · 303 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.

  1. 5d ago First seen · 303 lines · 2,355 tokens per session scan A 4a3a3710cf9a

Subscribe to this mod's changes

repl-mcp CLAUDE.md is an instructions file published in the GitHub repository simm-is/repl-mcp (44 stars, last pushed 8mo ago), licensed MIT. It adds 2,355 tokens to every session, about $0.0118 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 2026-08-30.

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