Clean Architecture practitioner's guide. Trigger when users ask about four-layer architecture, dependency direction & inversion (DIP), an entity directly depending on external SDKs, ORM/data access layer (Repository pattern) design, microservice decomposition, technology selection, over-engineering, or architecture refactoring. Covers business logic organization in Express/Next.js/Go/Spring projects, MongoDB→PostgreSQL migrate, REST→GraphQL migrate, third-party integration (Stripe/PayPal), Redis caching, and Kafka message queue evaluation. Evaluates architecture against Robert C. Martin's Clean Architecture, SOLID principles, and the Dependency Rule; uses Musk's five-step algorithm as an anti-over-engineering gate. Do NOT trigger on: pure code quality, DDD, system design interviews, single-DTO micro-decisions, cache library selection, DI framework debugging, diagram drawing, translation, or formatting requests — answer directly without invoking this skill.
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