tl;dr: REA is a tool that connects to coding agents (via `npx rea-agents@latest setup`) to let them reverse-engineer software by inspecting binaries, scripts, and runtime behavior. The agent can read disassembly, decompiled code, and loaded scripts, then explain or rebuild functionality in plain English. Demos include recovering Chrome's dinosaur game acceleration rule (0.001 per update, max 13) and Windows Calculator's percentage logic (which differs between +/− and ×/÷ operations).