Reverse Engineering Specifications

Overview

For brownfield/legacy projects without documentation, this skill generates implementation-free specifications by exhaustively analyzing existing code. The output is a complete behavioral description that drives autonomous development on top of the existing codebase — enabling safe refactoring, feature addition, and modernization.

Key principle: Document actual behavior, including bugs. Bugs are "documented features" until explicitly marked for fixing.

This is a RIGID skill. Every code path must be traced. No assumptions, no skipping.

Phase 1: Exhaustive Code Investigation

[HARD-GATE] Every code path must be traced. No assumptions, no skipping.

Deploy parallel subagents via the Agent tool (up to 500, with subagent_type="Explore") to analyze: