system-integration-validatorlisted

# System Integration Validator Validates system integration before deployment. ## When to Use - Pre-deployment validation - Checking port availability - Verifying database connections - Debugging stuck workflows - Detecting dead ends or circular dependencies ## Workflow ### Step 1: Check Ports Verify all required ports are free. ### Step 2: Verify Databases Test PostgreSQL and Redis connections. ### Step 3: Validate API Contracts Ensure frontend ↔ backend match. ### Step 4: Analyze Data Flow Detect dead ends, orphan inputs, bottlenecks. --- ## Pre-Deployment Checklist 1. **Ports** - All required ports free 2. **Database** - Connection, pool, migrations OK 3. **API Contract** - Frontend ↔ Backend match 4. **Data Flow** - No dead ends or loops ## Port Check ```bash for port in 3000 3001 5432 6379 8080; do lsof -i :$port > /dev/null 2>&1 && echo "⚠️ $port IN USE" || echo "✅ $port free" done ``` ## Database Check ```bash pg_isready -h localhost -p 5432 && echo "✅ PostgreSQL OK" redis-cli ping && echo "✅ Redis OK" ``` ## Flow Analysis Look for: - **Dead ends**: Output never consumed - **Orphan inputs**: Input never provided - **Bottlenecks**: High in-degree (>3 inputs) - **Circular deps**: A → B → A ## Common Blocks ```typescript // ❌ No timeout await fetch(url) // ✓ With timeout const ctrl = new AbortController() setTimeout(() => ctrl.abort(), 5000) await fetch(url, { signal: ctrl.signal }) ```