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Found 9 Skills
Use when creating or modifying classes, modules, or functions. Use when feeling pressure to add functionality to existing code. Use when class has multiple reasons to change.
Phase 2 of disciplined development. Creates implementation plans based on approved research. Specifies file changes, function signatures, test strategy, and step sequence. Requires human approval before implementation.
Audit code for testability design patterns. Identifies business logic entangled with IO, hard-coded dependencies, and mocking friction. Suggests functional core / imperative shell separation. Read-only analysis. Triggers: review testability, testable code, mocking issues, dependency injection.
Language-agnostic SOLID principles and DDD tactical patterns. Trigger: Always loaded for non-documentation code changes via sdd-apply.
This skill should be used when the user asks to "implement a feature in Elixir", "refactor this module", "should I use a GenServer here?", "how should I structure this?", "use the pipe operator", "add error handling", "make this concurrent", or mentions protocols, behaviours, pattern matching, with statements, comprehensions, structs, or coming from an OOP background. Contains paradigm-shifting insights.
Expert software architecture council with 6 advisors (Fowler, Beck, Uncle Bob, Newman, Hightower, Kim) for code design, architecture patterns, infrastructure, and development practices.
Technical checklist for backend PR self-review (NestJS/TypeScript) — B1–B21 static analysis + G1–G16 design patterns. Use when you want to run a checklist against a PR or piece of code. For the full review workflow with GitHub posting and Notion integration, use pr-review.
Comprehensive skill for all 26 Gang of Four design patterns with PHP 8.3+ implementations. Covers creational (Abstract Factory, Builder, Factory Method, Prototype, Singleton), structural (Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy), and behavioral patterns (Chain of Responsibility, Command, Interpreter, Iterator, Mediator, Memento, Observer, State, Strategy, Template Method, Visitor) plus Null Object, Object Pool, and Private Class Data.
Opinionated guide to software design principles and architectural patterns. Use when reviewing code design, planning feature architecture, asking "is this the right design?", "how should I structure this?", or requesting design philosophy guidance. Triggers on questions about SOLID, DRY, KISS, YAGNI, Clean Architecture, DDD, hexagonal architecture, composition vs inheritance, coupling, cohesion, or any software design trade-off discussion.