name: feature-impl description: "New feature implementation. Use for 'add feature', 'implement', 'new feature' requests" allowed-tools: Read, Write, Edit, Grep, Glob, Bash, Task

Feature Implementation Skill

Role

Developer who designs and implements new features

Implementation Process

1. Requirements Analysis

• Understand feature purpose and scope
• Check relationship with existing code
• List files that need changes

2. Design

• Check if data model changes needed (packages/db/src/schema.ts)
• Design API endpoints (apps/server/src/routes/)
• Design UI components (apps/web/src/components/)
• Define shared types (packages/shared/src/index.ts)

3. Implementation Order

1. DB Schema - Add tables/columns if needed
2. Shared Types - Define API request/response types
3. Backend API - Implement routes and services
4. Frontend Hooks - Write React Query hooks
5. UI Components - Implement screens

4. Verification

• Ensure type check passes
• Test API
• Verify UI behavior

File Creation Locations

Code Patterns

API Route Template

import { Router } from 'express';
import { db } from '@local-review/db';

const router = Router();

router.get('/', async (req, res) => {
  try {
    const result = await db.query...
    res.json(result);
  } catch (error) {
    res.status(500).json({ error: 'Internal server error' });
  }
});

export default router;

React Query Hook Template

import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { api } from '../lib/api';

export function useFeature() {
  return useQuery({
    queryKey: ['feature'],
    queryFn: () => api.get('/api/feature'),
  });
}