---

name: vendix-development-rules description: General development rules. metadata: scope: [root] auto_invoke: "General Development"

Vendix Development Rules

CRITICAL SKILL - ALWAYS ACTIVE - Estas reglas son MANDATORIAS para toda interacción con el código base.

🚨 MANDATORY REQUIREMENTS

Rule 1: ALWAYS Use Task Tools

YOU MUST USE Task tools for:

• Complex, multi-step operations
• Codebase exploration and research
• Architectural decisions and planning
• Any task affecting multiple files

NEVER attempt complex operations without proper task management.

Copy# ✅ CORRECTO: Usar Task tool para explorar
Task tool → Explore agent → "Find all payment-related files"

# ❌ INCORRECTO: Usar Grep/Glob directamente para tareas complejas
Grep tool → Search "payment" (para análisis complejo)

When to use each agent:

• Explore agent: Fast codebase exploration, finding files by patterns
• Plan agent: Design implementation strategies before coding
• general-purpose agent: Complex multi-step tasks requiring multiple tools
• Bash: Simple terminal operations only (git, npm, docker)

---

metadata: scope: [root] auto_invoke: "Complex Tasks"

Rule 2: Consistency Over Preferences

ALWAYS prioritize:

1. Established patterns in the codebase
2. Existing conventions over personal preferences
3. Code consistency across the project

NEVER:

• Suggest "better" ways that differ from established patterns
• Introduce new conventions without justification
• Change working patterns for marginal improvements

Principle: If it works in the codebase, follow that pattern.

---

Rule 3: Code Quality Standards

YOU MUST MAINTAIN:

• Strong typing: Use TypeScript interfaces, NEVER any
• Modularity: Keep code modular and reusable
• Multi-tenancy: Always consider tenant isolation
• Error handling: Implement proper error handling at all layers
• Documentation: Add comments only when logic isn't self-evident

AVOID:

• Over-engineering simple solutions
• Premature abstractions
• Adding features "just in case"
• Changing code that already works

---

Rule 4: Technology Constraints

BACKEND:

• NEVER suggest JavaScript - Always TypeScript
• NEVER bypass Prisma - Always use generated clients
• NEVER hardcode tenant IDs - Use RequestContext (multi-tenant is automatic)

FRONTEND:

• NEVER use promises for HTTP - Always RxJS Observables
• NEVER create isolated state - Use global state when appropriate
• NEVER hardcode branding - Resolve from domain config
• NEVER use alert() - Use ToastService

Note: Backend uses global JWT authentication via APP_GUARD. Use @Public() decorator for public routes. See vendix-backend-auth for authentication patterns.

---

Rule 5: Before Making Changes

YOU MUST:

1. Read existing code before suggesting changes
2. Understand the pattern before implementing
3. Follow existing structures unless explicitly requested to change
4. Test builds after any code change

NEVER:

• Propose changes without reading the file first
• Assume patterns without verification
• Skip build verification

---

Rule 6: File Organization

BACKEND DOMAINS:

Copyapps/backend/src/domains/{domain}/
├── {domain}.module.ts
├── {domain}.controller.ts
├── {domain}.service.ts
├── dto/
└── entities/

FRONTEND MODULES:

Copyapps/frontend/src/app/private/modules/{module}/
├── {module}.component.ts
├── {module}.component.html
├── {module}.component.scss
├── components/
│   └── index.ts
├── services/
│   └── {module}.service.ts
└── interfaces/
    └── {module}.interface.ts

ALL COMPONENTS:

• MUST be in folders - Even if standalone, even if small
• MUST have index.ts - For clean exports
• MUST follow naming - kebab-case for folders, PascalCase for classes

---

Rule 7: Verification Workflow

BEFORE completing ANY task:

1. ✅ Check Docker logs for ALL modified components
2. ✅ Verify ZERO errors exist
3. ✅ Use appropriate commands:
   • Backend: docker logs --tail 40 vendix_backend
   • Frontend: docker logs --tail 40 vendix_frontend
   • Database: docker logs --tail 40 vendix_postgres
4. ✅ Re-check after fixes
5. ✅ Only then mark task complete

NO EXCEPTIONS - A task is NEVER complete with build errors.

---

🎯 Quick Reference

---

📋 Decision Tree

CopyStart Task
    │
    ├─→ Is it complex/multi-step?
    │   └─→ YES: Use Task tool
    │   └─→ NO: Can I do it with one tool?
    │       └─→ YES: Use that tool
    │       └─→ NO: Use Task tool
    │
    ├─→ Does it involve code changes?
    │   └─→ YES: Read file first
    │   └─→ Follow existing patterns
    │   └─→ Verify build after
    │
    └─→ Is it a new feature/module?
        └─→ YES: Use Plan agent first
        └─→ Get user approval
        └─→ Then implement

---

🔴 CRITICAL REMINDERS

1. NEVER skip Task tools for complex operations
2. NEVER compromise naming conventions (see vendix-naming-conventions)
3. NEVER skip build verification (see vendix-build-verification)
4. ALWAYS read existing code before changing
5. ALWAYS follow established patterns

---

Related Skills

• vendix-naming-conventions - ABSOLUTE PRIORITY for naming
• vendix-build-verification - MANDATORY build checks
• vendix-backend-domain - Backend domain patterns
• vendix-frontend-component - Frontend component patterns