this prompt turns Claude Code into a reverse engineer, a role people get paid $136,000 a year for REA + Opus 5.5 reads the app on your computer, the card holds the whole run in one prompt here's the guide: > step 1: install Claude Code and sign in on a paid plan, Codex, Cursor and OpenCode work too > step 2: run npx rea-agents setup, approve the plan it prints, it wires REA into the agent you picked > step 3: quit the agent completely and start it again, then ask it to list its REA tools > step 4: paste the prompt from the card, fill in the app and ONE feature you can say in a sentence > step 5: it stops after the findings and splits them into confirmed, inferred and unknown > step 6: then SPECmd gets written, the build comes from that file alone, and the tests go against the original the result: a feature you actually understand, and a build that proves itself instead of just looking right the install, the limits and five more prompts are in the article below