This started as plain text: a product idea for a skill that grills a vague plan until every decision is concrete — who the users are, MVP vs v2, offline or not, and what "log a workout" actually means.
SkillsCake turned it into a real skill: YAML packaging, a definition of "specific enough to build," question format with recommendations and overrides, dependency call-outs, and a repeatable loop that rewrites the brief in place. Wall time on this bake was about six minutes.
The 0.14 to 0.79score is a blind evaluation across five dimensions — same rubric as every run. The before side wasn't a skill at all, so the floor is low.