This turns fuzzy requirements into testable specs using EARS syntax, a Rolls-Royce methodology that structures natural language into precise patterns like "When user creates task, system shall guide decomposition into sub-tasks." It layers on domain theory grounding (GTD for productivity, BJ Fogg for behavior change), extracts concrete examples with real data, then outputs a complete Role/Skills/Workflows/Examples/Formats prompt. Most useful when someone gives you "build a dashboard" or "make it user-friendly" and you need measurable criteria and explicit triggers. The four reference files cover EARS patterns, 40+ theories across 10 domains, complete transformations, and advanced techniques for multi-stakeholder requirements. Honest take: this is overkill for simple features but genuinely helpful when requirements ambiguity would otherwise cost you three revision rounds.
npx skills add https://github.com/daymade/claude-code-skills --skill prompt-optimizer