---
title: "I Used REA + Claude Code on 5 Real Tests. Here's What I Found"
url: "https://reamcp.dev/en/cases/i-used-rea-claude-code-on-5-real-tests-here-s-what-i-found-7b0994"
source: "https://www.youtube.com/watch?v=c_o-2m7925o"
source_type: "resource"
author: "Darius X AI"
author_handle: "dariusxai"
stars: 0
category: "CTF & learning"
categories: ["ctf-learning"]
tags: ["claude-code", "mcp", "obsidian", "reverse-engineering", "tutorial"]
added: "2026-10-13T04:19:43.448Z"
updated: "2026-10-13T04:19:43.448Z"
locale: "en"
content_locale: "en"
---

# I Used REA + Claude Code on 5 Real Tests. Here's What I Found

A walkthrough video showing what REA (Reverse Engineer Anything) is, how to install it with `npx rea-agents setup`, and five real Claude Code sessions: reverse-engineering Obsidian's Quick Switcher ranking, inspecting a scroll effect on the author's own site, reading a Mac app's permission requests, observing a news homepage's network requests, and rebuilding a small Obsidian-like tool. Links to the official REA repository and the prompts are included.

## Description

The video demonstrates REA, an open-source MCP tool that collects reverse-engineering evidence for AI agents, used with Claude Code. It covers installation (npx rea-agents setup, Node 22+), then five use cases: how Obsidian's Quick Switcher ranks notes (rebuilt with 0 mismatches over ~19,800 searches), how the scroll video effect on the author's own chocolate site is built, what the Grok Bot Mac app can request, what a news homepage sends on first load (~1,520 requests to 163 domains), and Claude mapping Obsidian and building a small clone in under 8 minutes. The author notes results are location-dependent, that static checks show capability rather than past behaviour, and advises lawful use and not copying others' code. Official repo: https://github.com/morluto/rea; prompts: https://dariusmirza88.substack.com/p/rea-claude-code-the-5-prompts-i-used

## Original README

I Used REA + Claude Code on 5 Real Tests. Here's What I Found