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Found 38 Skills
Use this skill when writing code, implementing features, refactoring, planning architecture, designing systems, reviewing code, or debugging. This skill transforms junior-level code into senior-engineer quality software through SOLID principles, TDD, clean code practices, and professional software design.
UML diagram design and drawing. Use this skill when users need to create system architecture diagrams, class diagrams, sequence diagrams, use case diagrams, or other UML diagrams.
Apply the K.I.S.S principle (Keep It Simple, Stupid) to reduce complexity, improve maintainability, and solve problems elegantly. Use when designing systems, writing code, planning solutions, creating documentation, architecting features, or making decisions where simplicity drives quality and efficiency.
Turn ideas into fully formed designs and specs through natural collaborative dialogue. Use when planning new features, designing architecture, or making significant changes to the codebase.
Decision framework for architectural patterns including DI, SOA, Repository, Domain Events, Circuit Breaker, and Anti-Corruption Layer. Use when designing systems, choosing patterns, or reviewing architecture.
Provides comprehensive guidance for clean architecture including layer separation, dependency rules, and architectural patterns. Use when the user asks about clean architecture, needs to implement clean architecture principles, or structure applications with clean architecture.
Explore candidate solutions before committing. Use when you have a problem statement and need to evaluate approaches - band-aid, optimize, reframe, or redesign.
Apply Gang of Four and related design patterns in JavaScript and TypeScript. Use when implementing creational, structural, or behavioral patterns, or when the user mentions factories, builder, prototype, flyweight, singleton, object pool, adapter, wrapper, decorator, proxy, bridge, composite, facade, chain of responsibility, command, interpreter, iterator, mediator, memento, EventEmitter, EventTarget, state, strategy, template method, visitor, revealing constructor, actor, service locator, or any other pattern.
Comprehensive knowledge of all 23 Gang of Four design patterns with progressive disclosure (Quick/Practical/Deep), pattern recognition for problem-solving, and philosophy-aligned guidance to prevent over-engineering.
Generate multiple radically different interface designs for a module using parallel sub-agents. Use when user wants to design an API, explore interface options, compare module shapes, or mentions "design it twice".
Scan and analyze a software repository or project for design quality using principles from A Philosophy of Software Design by John Ousterhout. Use when user asks to review, audit, scan, or evaluate code quality, design quality, architecture, or technical debt. Also trigger for: code review, design review, complexity analysis, code health check, module depth analysis, information hiding review, how good is my code, review my project, find design problems, what is wrong with my codebase, rate my code, or anything about evaluating software design quality at a structural level. This is not a linter or style checker. It evaluates deep design qualities like module depth, abstraction quality, information hiding, and complexity patterns.
Investigates and analyzes an idea or codebase area before committing to changes. Pure research, no writes. Trigger: /sdd-explore <topic>, explore, investigate codebase, research feature, analyze before changing.