Reverse Engineer Spec from Branch Implementation

Problem

Feature branches often ship without comprehensive documentation. After the fact, teams need product specs, architectural docs, or onboarding materials that explain what was built and why. Manually reading every file change is slow and error-prone. This skill systematically extracts a complete spec from a branch's diff.

Context / Trigger Conditions

• User asks to "analyze this branch" or "reverse engineer a spec"
• User asks to "document what this branch does"
• User wants a product spec, technical spec, or design doc from existing code
• A branch has many commits and files changed and needs a coherent explanation
• Onboarding to an unfamiliar feature branch

Solution