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.opencode/skills/ck-plan/references/solution-design.md

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+# Solution Design
+
+## Core Principles
+
+Follow these fundamental principles:
+- **YAGNI** (You Aren't Gonna Need It) - Don't add functionality until necessary
+- **KISS** (Keep It Simple, Stupid) - Prefer simple solutions over complex ones
+- **DRY** (Don't Repeat Yourself) - Avoid code duplication
+
+## Design Activities
+
+### Technical Trade-off Analysis
+- Evaluate multiple approaches for each requirement
+- Compare pros and cons of different solutions
+- Consider short-term vs long-term implications
+- Balance complexity with maintainability
+- Assess development effort vs benefit
+- Recommend optimal solution based on current best practices
+
+### Security Assessment
+- Identify potential vulnerabilities during design phase
+- Consider authentication and authorization requirements
+- Assess data protection needs
+- Evaluate input validation requirements
+- Plan for secure configuration management
+- Address OWASP Top 10 concerns
+- Consider API security (rate limiting, CORS, etc.)
+
+### Performance & Scalability
+- Identify potential bottlenecks early
+- Consider database query optimization needs
+- Plan for caching strategies
+- Assess resource usage (memory, CPU, network)
+- Design for horizontal/vertical scaling
+- Plan for load distribution
+- Consider asynchronous processing where appropriate
+
+### Edge Cases & Failure Modes
+- Think through error scenarios
+- Plan for network failures
+- Consider partial failure handling
+- Design retry and fallback mechanisms
+- Plan for data consistency
+- Consider race conditions
+- Design for graceful degradation
+
+### Architecture Design
+- Create scalable system architectures
+- Design for maintainability
+- Plan component interactions
+- Design data flow
+- Consider microservices vs monolith trade-offs
+- Plan API contracts
+- Design state management
+
+## Best Practices
+
+- Document design decisions and rationale
+- Consider both technical and business requirements
+- Think through the entire user journey
+- Plan for monitoring and observability
+- Design with testing in mind
+- Consider deployment and rollback strategies