SuperClaude/.claude/commands/design.md

Legend

Symbol	Meaning		Abbrev	Meaning
→	leads to		API	application programming interface
&	and/with		DDD	domain-driven design
w/	with		PRD	product requirements document

Execute immediately. Add --plan flag if user wants to see plan first.

Design & architect software solutions based on requirements in $ARGUMENTS.

Thinking flags (optional):

• --think→standard design patterns & component architecture
• --think-hard→system-wide architecture & scalability planning
• --ultrathink→complete system redesign or critical architectural decisions

Examples:

• /user:design --api --think - REST API design w/ patterns
• /user:design --ddd --think-hard - Deep domain modeling
• /user:design --api --ddd --ultrathink - Complete system architecture

Design focus w/ flags:

--api flag:

• Design REST or GraphQL APIs
• w/ --openapi: Generate OpenAPI 3.0 spec | w/ --graphql: Create GraphQL schema & resolvers
• Include auth, rate limiting & error handling | Design→scalability & maintainability

--ddd flag:

• Apply DDD principles | w/ --bounded-context: Define context boundaries & mappings
• Design entities, value objects & aggregates | Create domain services & events | Impl repository patterns

--prd flag:

• Create PRD | w/ --template: Use template (feature/api/integration/migration)
• Include user stories w/ acceptance criteria | Define success metrics & timelines | Document tech requirements

API Design Mode (--api)

REST API principles:

• Resource-oriented URLs w/ proper HTTP verbs | Consistent status codes & error formats
• Versioning strategy (URL/header/accept) | Pagination, filtering & sorting | HATEOAS→discoverability | OpenAPI docs

GraphQL principles:

• Clear type system w/ schemas | Efficient queries & mutations | Real-time subscriptions where needed
• DataLoader patterns→N+1 prevention | Field-level auth | Error handling practices

Common API elements:

• Auth (JWT/OAuth/API keys) | Rate limiting & throttling | Request/response validation
• Caching strategies | CORS & security headers | Monitoring & logging

DDD Mode (--ddd)

Building blocks:

• Entities: Objects w/ unique identity | Value Objects: Immutable objects by attributes
• Aggregates: Consistency boundaries w/ roots | Domain Services: Business logic not in entities
• Repositories: Abstract data access | Domain Events: Capture business events

Strategic patterns:

• Bounded contexts w/ clear boundaries | Context mapping (shared kernel, anti-corruption layer)
• Ubiquitous language within contexts | Event-driven architecture | CQRS where appropriate

Structure:

domain/          # Core business logic
application/     # Use cases & orchestration  
infrastructure/  # External concerns
presentation/    # UI/API layer

PRD Mode (--prd)

Structure:

1. Executive Overview: Problem statement & solution | Expected impact & ROI | Key stakeholders
2. Goals & Success Metrics: Primary objectives (must-have) | Secondary goals (nice-to-have) | KPIs & measurement
3. User Stories & Requirements: User personas & journeys | Functional requirements | Non-functional requirements | Acceptance criteria
4. Technical Specs: Architecture overview | Tech choices | Integration points | Security requirements | Perf targets
5. Timeline & Risks: Dev phases | Dependencies & blockers | Risk mitigation strategies

Integration

Combined modes:

• API+DDD: Design domain-driven APIs | API+PRD: Create API product requirements
• DDD+PRD: Document domain-driven architecture | All three: Complete system design

Best practices:

• Start w/ user needs & business goals | Design→change & evolution | Consider non-functional early
• Document decisions & rationale | Include examples & diagrams | Plan→testing & monitoring

Research requirements:

• Architecture patterns→C7 & industry practices | API standards→reference OpenAPI/REST/GraphQL specs
• DDD patterns→verify w/ Evans' book or official DDD | Tech choices→WebSearch recent comparisons & case studies
• Never design on assumptions - verify patterns | All decisions cite authoritative sources

Deliverables:

• API: Complete spec, impl guide, docs | DDD: Domain model, bounded contexts, architecture diagrams, code structure
• PRD: Requirements doc, user stories, success metrics, timeline