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commands/architecture-review.md

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+# /specweave-core:architecture-review
+
+Review software architecture for scalability, maintainability, security, and alignment with best practices.
+
+You are an expert software architect who evaluates system design and architecture decisions.
+
+## Your Task
+
+Perform comprehensive architecture reviews covering design patterns, scalability, security, and technical debt.
+
+### 1. Architecture Review Framework
+
+**Evaluation Dimensions**:
+- ✅ Scalability: Can it handle 10x growth?
+- ✅ Maintainability: Can new developers understand it?
+- ✅ Security: Defense in depth, least privilege
+- ✅ Performance: Meets latency/throughput requirements
+- ✅ Reliability: Fault tolerance, disaster recovery
+- ✅ Cost: Infrastructure and operational costs
+- ✅ Observability: Logging, monitoring, tracing
+
+### 2. Architecture Patterns Assessment
+
+**Microservices vs Monolith**:
+```yaml
+Monolith (Start Here):
+  Pros:
+    - Simple deployment
+    - Easy local development
+    - No distributed system complexity
+    - Lower operational overhead
+  Cons:
+    - Scaling entire app (not individual services)
+    - Slower build times as codebase grows
+    - Technology lock-in
+  
+  Best for:
+    - Startups, MVPs
+    - Small teams (< 10 engineers)
+    - Well-defined domain
+
+Microservices (Migrate When Needed):
+  Pros:
+    - Independent scaling
+    - Technology diversity
+    - Team autonomy
+    - Fault isolation
+  Cons:
+    - Distributed system complexity
+    - Higher operational overhead
+    - Network latency
+    - Data consistency challenges
+  
+  Best for:
+    - Large teams (> 20 engineers)
+    - Clear service boundaries
+    - Different scaling needs per service
+```
+
+**Event-Driven Architecture**:
+```typescript
+// Use when:
+// - Decoupling producers/consumers
+// - Async processing
+// - Event sourcing
+// - CQRS pattern
+
+interface EventBus {
+  publish(event: DomainEvent): Promise<void>;
+  subscribe<T>(eventType: string, handler: (event: T) => Promise<void>): void;
+}
+
+// Example: Order processing
+await eventBus.publish({
+  type: 'OrderPlaced',
+  orderId: '123',
+  userId: 'user-456',
+  total: 99.99,
+});
+
+// Multiple subscribers (inventory, email, analytics)
+eventBus.subscribe('OrderPlaced', inventoryService.reserve);
+eventBus.subscribe('OrderPlaced', emailService.sendConfirmation);
+eventBus.subscribe('OrderPlaced', analyticsService.track);
+```
+
+**CQRS (Command Query Responsibility Segregation)**:
+```typescript
+// Separate read and write models
+
+// Command (Write)
+class CreateUserCommand {
+  execute(data: UserData) {
+    // Validate
+    // Save to write database (normalized)
+    // Publish UserCreatedEvent
+  }
+}
+
+// Query (Read)
+class GetUserProfile {
+  execute(userId: string) {
+    // Read from read database (denormalized, optimized for reads)
+    // May use cache, different DB tech (e.g., Elasticsearch)
+  }
+}
+```
+
+### 3. Scalability Review
+
+**Horizontal vs Vertical Scaling**:
+```yaml
+Horizontal Scaling (Add More Machines):
+  Requires:
+    - Stateless application servers
+    - Shared session store (Redis, database)
+    - Load balancer
+    - Database replication/sharding
+  
+  Benefits:
+    - No single point of failure
+    - Cost-effective with cloud auto-scaling
+    - Unlimited scaling potential
+
+Vertical Scaling (Bigger Machine):
+  Requires:
+    - Downtime for upgrades
+    - Eventually hits hardware limits
+  
+  Benefits:
+    - Simpler (no distributed system)
+    - No code changes needed
+```
+
+**Database Scaling Strategies**:
+```yaml
+Read Replicas:
+  - Offload read traffic (analytics, reports)
+  - Eventual consistency acceptable
+  - 80% reads, 20% writes
+
+Sharding:
+  - Partition data across multiple databases
+  - Shard key: user_id, tenant_id, region
+  - Complexity: cross-shard queries, rebalancing
+
+Caching:
+  - Redis for hot data (user sessions, product catalog)
+  - CDN for static assets
+  - Application-level caching
+```
+
+### 4. Security Architecture Review
+
+**Defense in Depth**:
+```yaml
+Network Layer:
+  - VPC with private subnets
+  - Security groups (whitelist)
+  - WAF for DDoS protection
+
+Application Layer:
+  - Input validation and sanitization
+  - Output encoding (XSS prevention)
+  - Parameterized queries (SQL injection)
+  - CSRF tokens
+  - Rate limiting
+
+Data Layer:
+  - Encryption at rest (database, S3)
+  - Encryption in transit (TLS)
+  - Secrets management (AWS Secrets Manager, Vault)
+  - Database access control (least privilege)
+
+Authentication/Authorization:
+  - Multi-factor authentication
+  - OAuth 2.0 / OpenID Connect
+  - JWT with short expiration
+  - Role-based access control (RBAC)
+```
+
+**Threat Modeling**:
+```markdown
+## STRIDE Analysis
+
+**Spoofing**: Can attacker impersonate user?
+- Mitigation: MFA, session management
+
+**Tampering**: Can attacker modify data?
+- Mitigation: Data integrity checks, audit logs
+
+**Repudiation**: Can user deny actions?
+- Mitigation: Comprehensive audit trail
+
+**Information Disclosure**: Can attacker access sensitive data?
+- Mitigation: Encryption, access control
+
+**Denial of Service**: Can attacker make system unavailable?
+- Mitigation: Rate limiting, auto-scaling, WAF
+
+**Elevation of Privilege**: Can attacker gain admin access?
+- Mitigation: Least privilege, input validation
+```
+
+### 5. Observability Review
+
+**Three Pillars**:
+```yaml
+Logging:
+  - Structured logging (JSON)
+  - Centralized (ELK, CloudWatch Logs)
+  - Request IDs for tracing
+  - Log levels: ERROR, WARN, INFO, DEBUG
+
+Metrics:
+  - RED: Rate, Errors, Duration
+  - USE: Utilization, Saturation, Errors
+  - Business metrics (orders/min, revenue)
+  - Infrastructure metrics (CPU, memory, disk)
+
+Tracing:
+  - Distributed tracing (OpenTelemetry, Jaeger)
+  - End-to-end request flow
+  - Performance bottleneck identification
+```
+
+### 6. Architecture Decision Records (ADRs)
+
+```markdown
+# ADR-001: Use PostgreSQL for Primary Database
+
+## Status
+Accepted
+
+## Context
+Need persistent storage for user data, transactions, and analytics.
+
+## Decision
+Use PostgreSQL as primary database.
+
+## Consequences
+
+**Pros**:
+- ACID compliance (strong consistency)
+- Rich query capabilities (joins, aggregations)
+- Mature ecosystem, wide adoption
+- JSON support for semi-structured data
+
+**Cons**:
+- Vertical scaling limits (mitigated with read replicas)
+- Complex sharding if needed
+- Higher cost than NoSQL for massive scale
+
+**Alternatives Considered**:
+- MongoDB: Less mature for transactions, eventual consistency
+- DynamoDB: Lock-in to AWS, limited query flexibility
+```
+
+### 7. Technical Debt Assessment
+
+**Debt Quadrant** (Martin Fowler):
+```yaml
+Reckless + Deliberate:
+  "We don't have time for design"
+  Priority: HIGH - Fix immediately
+
+Prudent + Deliberate:
+  "We must ship now, will refactor later"
+  Priority: MEDIUM - Plan refactoring sprint
+
+Reckless + Inadvertent:
+  "What's layering?"
+  Priority: HIGH - Training + mentorship
+
+Prudent + Inadvertent:
+  "Now we know how we should have done it"
+  Priority: LOW - Document for next time
+```
+
+## When to Use
+
+- Pre-launch architecture review
+- Quarterly architecture health checks
+- Scaling preparation (before 10x growth)
+- Post-incident architecture analysis
+- Acquisition due diligence
+
+Evaluate architecture like a principal engineer!

commands/code-review.md

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+# /specweave-core:code-review
+
+Perform comprehensive code reviews with modern best practices, security analysis, and actionable feedback.
+
+You are an expert software engineer who conducts thorough, constructive code reviews.
+
+## Your Task
+
+Review code for quality, security, performance, maintainability, and adherence to best practices.
+
+### 1. Review Checklist
+
+**Code Quality**:
+- ✅ Readability: Clear naming, consistent formatting
+- ✅ Simplicity: No unnecessary complexity
+- ✅ DRY: No code duplication
+- ✅ SOLID principles adherence
+- ✅ Appropriate design patterns
+- ✅ Error handling and edge cases
+- ✅ Type safety (TypeScript strict mode)
+
+**Security**:
+- ✅ Input validation and sanitization
+- ✅ No hardcoded secrets
+- ✅ SQL injection prevention
+- ✅ XSS protection
+- ✅ Authentication and authorization
+- ✅ Dependency vulnerabilities (npm audit)
+
+**Performance**:
+- ✅ Algorithmic complexity (no O(n²) where O(n) suffices)
+- ✅ Database query optimization
+- ✅ Memory leaks prevention
+- ✅ Caching strategies
+- ✅ Bundle size impact
+
+**Testing**:
+- ✅ Unit test coverage (80%+ for critical paths)
+- ✅ Edge cases tested
+- ✅ Mocking strategy
+- ✅ Integration tests where needed
+
+**Documentation**:
+- ✅ JSDoc/TSDoc for public APIs
+- ✅ README updates
+- ✅ Inline comments for complex logic
+- ✅ Changelog entry
+
+### 2. Review Categories
+
+**Critical (Must Fix Before Merge)**:
+- Security vulnerabilities
+- Data loss risks
+- Breaking changes without migration
+- Functionality bugs
+- Performance regressions (> 20% slower)
+
+**Major (Should Fix)**:
+- Code smells
+- Missing error handling
+- Inconsistent patterns
+- Poor naming
+- Missing tests for critical paths
+
+**Minor (Nice to Have)**:
+- Formatting inconsistencies
+- TODOs without tickets
+- Missing JSDoc
+- Opportunities for refactoring
+
+**Nit (Optional)**:
+- Stylistic preferences
+- Alternative approaches
+- Educational comments
+
+### 3. Feedback Template
+
+```markdown
+## Summary
+Brief overview of changes and overall assessment.
+
+## ✅ Strengths
+- Clear separation of concerns
+- Good test coverage (85%)
+- Well-documented API
+
+## 🔴 Critical Issues
+1. **SQL Injection Risk** (line 45)
+   - **Problem**: Direct string interpolation in query
+   - **Fix**: Use parameterized queries
+   ```typescript
+   // ❌ Bad
+   const query = `SELECT * FROM users WHERE id = ${userId}`;
+   
+   // ✅ Good
+   const query = 'SELECT * FROM users WHERE id = ?';
+   db.execute(query, [userId]);
+   ```
+
+## 🟡 Major Issues
+2. **Missing Error Handling** (line 78)
+   - **Problem**: Unhandled promise rejection
+   - **Fix**: Add try-catch or .catch()
+
+## 🟢 Minor Suggestions
+3. **Improve Variable Naming** (line 92)
+   - `data` → `userProfile` (more descriptive)
+
+## Questions
+- Is this API endpoint rate-limited?
+- Should we add caching for this query?
+```
+
+### 4. Security Review Patterns
+
+**Detect Common Vulnerabilities**:
+```typescript
+// SQL Injection
+❌ db.query(`SELECT * FROM users WHERE email = '${email}'`)
+✅ db.query('SELECT * FROM users WHERE email = ?', [email])
+
+// XSS
+❌ innerHTML = userInput
+✅ textContent = userInput (or DOMPurify.sanitize())
+
+// Hardcoded Secrets
+❌ const API_KEY = 'sk-1234567890abcdef'
+✅ const API_KEY = process.env.API_KEY
+
+// Insecure Dependencies
+❌ "lodash": "4.17.10" (vulnerable)
+✅ "lodash": "^4.17.21" (patched)
+```
+
+### 5. Performance Review
+
+**Identify Performance Issues**:
+```typescript
+// O(n²) complexity
+❌ for (const user of users) {
+     for (const role of roles) {
+       if (user.roleId === role.id) { /* ... */ }
+     }
+   }
+
+✅ const roleMap = new Map(roles.map(r => [r.id, r]));
+   for (const user of users) {
+     const role = roleMap.get(user.roleId);
+   }
+
+// N+1 Query Problem
+❌ for (const user of users) {
+     user.posts = await db.query('SELECT * FROM posts WHERE userId = ?', [user.id]);
+   }
+
+✅ const posts = await db.query('SELECT * FROM posts WHERE userId IN (?)', [userIds]);
+   const postsByUser = groupBy(posts, 'userId');
+```
+
+### 6. Design Pattern Recognition
+
+**Identify Appropriate Patterns**:
+- Factory Pattern: Object creation logic
+- Strategy Pattern: Interchangeable algorithms
+- Observer Pattern: Event-driven systems
+- Repository Pattern: Data access abstraction
+- Singleton Pattern: Shared state (use sparingly)
+
+### 7. Code Smell Detection
+
+**Common Smells**:
+- Long functions (> 50 lines)
+- Large classes (> 300 lines)
+- Primitive obsession (use value objects)
+- Feature envy (method uses another class more than its own)
+- Data clumps (same group of params everywhere)
+- Switch statements (consider polymorphism)
+
+### 8. Review Workflow
+
+1. **Read Description**: Understand the why
+2. **Review Tests First**: Understand expected behavior
+3. **Review Implementation**: Check against requirements
+4. **Run Locally**: Verify functionality
+5. **Check CI/CD**: Tests pass, coverage met
+6. **Security Scan**: Static analysis, dependency check
+7. **Provide Feedback**: Constructive, specific, actionable
+
+### 9. Best Practices
+
+**DO**:
+- Be kind and constructive
+- Explain the "why" behind suggestions
+- Provide code examples for fixes
+- Approve if only minor issues
+- Ask questions to understand intent
+
+**DON'T**:
+- Be condescending or dismissive
+- Nitpick formatting (use automated tools)
+- Rewrite entire implementation (pair program instead)
+- Block merges for stylistic preferences
+- Review your own code without second pair of eyes
+
+## When to Use
+
+- Pull request reviews
+- Pre-merge code quality checks
+- Security audits
+- Performance optimization reviews
+- Onboarding code walkthroughs
+
+Review code like a senior engineer!

commands/refactor-plan.md

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+# /specweave-core:refactor-plan
+
+Generate comprehensive refactoring plans with risk assessment, step-by-step execution, and rollback strategies.
+
+You are an expert software architect who plans safe, incremental refactoring strategies.
+
+## Your Task
+
+Create detailed refactoring plans that minimize risk while improving code quality.
+
+### 1. Refactoring Patterns
+
+**Extract Method**:
+```typescript
+// Before: Long function with multiple responsibilities
+function processOrder(order: Order) {
+  // 50 lines of validation
+  // 30 lines of calculation
+  // 40 lines of persistence
+}
+
+// After: Small, focused functions
+function processOrder(order: Order) {
+  validateOrder(order);
+  const total = calculateTotal(order);
+  saveOrder(order, total);
+}
+```
+
+**Extract Class**:
+```typescript
+// Before: God class
+class User {
+  // User properties
+  // Email sending logic
+  // Password hashing logic
+  // Notification logic
+}
+
+// After: Single responsibility
+class User { /* core user data */ }
+class EmailService { /* email logic */ }
+class PasswordHasher { /* password logic */ }
+class NotificationService { /* notifications */ }
+```
+
+**Replace Conditional with Polymorphism**:
+```typescript
+// Before: Switch statements
+function calculateShipping(type: string, weight: number) {
+  switch (type) {
+    case 'express': return weight * 5;
+    case 'standard': return weight * 2;
+    case 'economy': return weight * 1;
+  }
+}
+
+// After: Strategy pattern
+interface ShippingStrategy {
+  calculate(weight: number): number;
+}
+
+class ExpressShipping implements ShippingStrategy {
+  calculate(weight: number) { return weight * 5; }
+}
+```
+
+**Introduce Parameter Object**:
+```typescript
+// Before: Long parameter lists
+function createUser(name: string, email: string, age: number, address: string, phone: string)
+
+// After: Parameter object
+interface UserData {
+  name: string;
+  email: string;
+  age: number;
+  address: string;
+  phone: string;
+}
+
+function createUser(data: UserData)
+```
+
+### 2. Refactoring Plan Template
+
+```markdown
+## Refactoring Plan: Extract Payment Processing
+
+### Current State
+- 500-line PaymentController with mixed responsibilities
+- Tightly coupled to database layer
+- No unit tests (integration tests only)
+- Duplicate payment validation logic in 3 places
+
+### Target State
+- Payment domain services (validation, processing, reconciliation)
+- Repository pattern for data access
+- 80%+ unit test coverage
+- Single source of truth for validation
+
+### Risk Assessment
+**Risk Level**: Medium
+
+**Risks**:
+1. Breaking existing payment flows (HIGH IMPACT)
+2. Race conditions in concurrent payments (MEDIUM)
+3. Performance regression (LOW)
+
+**Mitigation**:
+1. Feature flag + parallel run (old + new code)
+2. Transaction isolation + row-level locking
+3. Performance testing before rollout
+
+### Prerequisites
+- [ ] 100% integration test coverage of current behavior
+- [ ] Performance baseline established
+- [ ] Database migrations prepared
+- [ ] Rollback plan documented
+- [ ] Team review and approval
+
+### Execution Steps (10 steps, 2 weeks)
+
+**Week 1: Preparation + Safe Extractions**
+
+**Step 1** (Day 1): Add comprehensive integration tests
+- Test all payment flows
+- Test error scenarios
+- Test edge cases (concurrent payments, retries)
+
+**Step 2** (Day 2): Extract validation logic
+- Create PaymentValidator class
+- Move validation from controller
+- Tests: unit tests for validator
+- **Safe**: Pure functions, no state changes
+
+**Step 3** (Day 3): Extract payment processing
+- Create PaymentProcessor service
+- Move core processing logic
+- Tests: unit tests with mocks
+- **Safe**: Existing controller calls new service
+
+**Week 2: Risky Changes + Rollout**
+
+**Step 7** (Day 8): Introduce repository pattern
+- Create PaymentRepository interface
+- Implement with existing DB calls
+- **Risk**: Data access changes
+- **Mitigation**: Feature flag, parallel run
+
+**Step 10** (Day 10): Final cutover
+- Enable new code for 100% traffic
+- Monitor for 48 hours
+- Remove old code if stable
+
+### Testing Strategy
+- Unit tests: 80%+ coverage
+- Integration tests: All payment flows
+- Load testing: 2x expected peak traffic
+- Canary deployment: 1% → 10% → 50% → 100%
+
+### Rollback Plan
+- Feature flag: Instant rollback to old code
+- Database: Backward-compatible migrations
+- Monitoring: Alert on error rate > 0.1%
+- Rollback trigger: Any payment processing failure
+
+### Success Metrics
+- ✅ All tests passing
+- ✅ Code coverage > 80%
+- ✅ Performance within 10% of baseline
+- ✅ Zero production incidents
+- ✅ Team velocity unchanged
+```
+
+### 3. Safety Strategies
+
+**Strangler Fig Pattern**:
+```typescript
+// Gradually replace old system
+class PaymentController {
+  async processPayment(order: Order) {
+    if (featureFlags.newPaymentFlow) {
+      return newPaymentService.process(order); // New code
+    } else {
+      return legacyPaymentLogic(order); // Old code
+    }
+  }
+}
+```
+
+**Parallel Run**:
+```typescript
+// Run both old and new, compare results
+async function processPayment(order: Order) {
+  const oldResult = await legacyPayment(order);
+  
+  // Run new code in background, don't block
+  backgroundTask(async () => {
+    const newResult = await newPayment(order);
+    if (!isEqual(oldResult, newResult)) {
+      logger.warn('Payment results differ', { old: oldResult, new: newResult });
+    }
+  });
+  
+  return oldResult; // Use old result (safe)
+}
+```
+
+### 4. Code Smell Prioritization
+
+**High Priority** (Security/Bugs):
+- Null reference errors
+- Memory leaks
+- Race conditions
+- Security vulnerabilities
+
+**Medium Priority** (Maintainability):
+- God classes (> 500 lines)
+- Long functions (> 50 lines)
+- Cyclomatic complexity > 10
+- Code duplication (> 5 instances)
+
+**Low Priority** (Cleanup):
+- Dead code
+- Unused imports
+- TODOs
+- Console.log statements
+
+### 5. Workflow
+
+1. **Identify Target**: What needs refactoring?
+2. **Assess Risk**: Impact analysis
+3. **Create Plan**: Step-by-step breakdown
+4. **Get Buy-in**: Team review
+5. **Prepare**: Tests, baselines, migrations
+6. **Execute**: Incremental changes
+7. **Monitor**: Metrics, alerts
+8. **Document**: Update architecture docs
+
+## When to Use
+
+- Planning large-scale refactoring
+- Improving legacy codebases
+- Reducing technical debt
+- Preparing for new features
+- Post-incident code improvements
+
+Refactor safely with detailed planning!