skills

Use when refactoring code, identifying refactor candidates, or improving design after tests are green.

Use when discussing levels of abstraction, composed method, SLAP, stepdown rule, or mixed abstraction levels within a function.

Use when refactoring into deep modules, choosing seams, classifying dependencies, deciding adapter strategy, or planning tests around a refactor.

Use when designing interfaces, comparing interface alternatives, applying Design It Twice, or exploring interfaces for a module.

Find deep-module opportunities in a codebase. Use when the user wants to improve architecture, refactor, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable.

Test-driven development with red-green-refactor loop. Use when user wants to build features or fix bugs using TDD, mentions "red-green-refactor", wants integration tests, or asks for test-first development.

Use when discussing modules, interfaces, implementation, depth, seams, adapters, leverage, locality, or code design terminology.