add-feature

Imported from wrtnlabs/autobe-examples (openai/gpt-5.4-mini/todo/.claude/skills/add-feature/SKILL.md). Install upstream with npx skills add wrtnlabs/autobe-examples --skill add-feature. Copyright stays with the author.

Add Feature

Implement a new feature and iterate until all tests pass (100% success rate).

FORBIDDEN

NEVER use:

• as keyword (type assertion)
• any type

Feature Description

$ARGUMENTS

Workflow Overview

┌─────────────────────────────────────┐
│  Phase 1: Implementation            │
│  - Controller                       │
│  - Provider                         │
│  - Collector/Transformer            │
│  - Interface                        │
└───────────────┬─────────────────────┘
                │
                ▼
┌─────────────────────────────────────┐
│  Phase 2: Test Design               │
│  - Happy path tests                 │
│  - Error case tests                 │
│  - Edge case tests                  │
└───────────────┬─────────────────────┘
                │
                ▼
┌─────────────────────────────────────┐
│  Phase 3: Test Loop                 │
│  while (pass_rate < 100%) {         │
│    run tests                        │
│    analyze failures                 │
│    fix code                         │
│  }                                  │
└───────────────┬─────────────────────┘
                │
                ▼
┌─────────────────────────────────────┐
│  Complete                           │
│  All tests pass!                    │
└─────────────────────────────────────┘

Phase 1: Implementation

See: flow-implement.md

1. Analyze Requirements

   • Understand the feature from $ARGUMENTS
   • Identify affected entities
   • Determine API endpoints needed

2. Create/Update Interface

   • Define DTOs (ICreate, IUpdate, ISummary, IRequest)
   • Add typia tags for validation

3. Create/Update Collector

   • Transform ICreate → Prisma.CreateInput

4. Create/Update Transformer

   • Transform Prisma record → Interface

5. Create/Update Provider

   • Implement business logic
   • Use Collector for create operations
   • Use Transformer for responses

6. Create/Update Controller

   • Define routes with TypedRoute
   • Add authentication decorators
   • Connect to Provider

7. Verify Build

   npm run build:main

Phase 2: Test Design

See: flow-test-design.md

Design comprehensive test scenarios including:

Happy Path (Normal Cases)

• ✅ Create entity successfully
• ✅ Read entity successfully
• ✅ Update entity successfully
• ✅ Delete entity successfully
• ✅ List entities with pagination

Error Cases

• ❌ Create with missing required fields
• ❌ Create with invalid field format
• ❌ Read non-existent entity (404)
• ❌ Update non-existent entity (404)
• ❌ Delete non-existent entity (404)
• ❌ Unauthorized access (401)
• ❌ Forbidden action (403)

Edge Cases

• ⚠️ Empty string input
• ⚠️ Null values for optional fields
• ⚠️ Maximum length strings
• ⚠️ Minimum/maximum numeric values
• ⚠️ Special characters in strings
• ⚠️ Duplicate creation attempt
• ⚠️ Concurrent modification
• ⚠️ Parent entity doesn't exist
• ⚠️ Circular reference attempt
• ⚠️ Soft-deleted entity access

Phase 3: Test Loop

See: flow-test-loop.md

REPEAT:
  1. Build tests
     npm run build:test

  2. Run tests
     npm run test -- --include "{feature}"

  3. If all pass → DONE

  4. If failures:
     a. Analyze failure reason
     b. Determine if test code issue or business logic issue
     c. Fix the appropriate code
     d. Go to step 1

UNTIL: 100% pass rate

Exit Conditions

✅ Success Criteria:

• npm run build:main passes
• npm run build:test passes
• npm run test passes with 100% success rate
• All happy path tests pass
• All error case tests pass
• All edge case tests pass

❌ Failure (requires manual intervention):

• Circular dependency detected
• External service unavailable
• Database schema change required
• Requirements ambiguity

Output

When complete, provide:

## Feature Implementation Complete

### Summary
- Feature: {description}
- Files created/modified: X
- Test scenarios: Y
- Pass rate: 100%

### Files Changed
- src/api/structures/I{Entity}.ts
- src/controllers/{path}/{Controller}.ts
- src/providers/{provider}.ts
- src/collectors/{Collector}.ts
- src/transformers/{Transformer}.ts
- test/prepare/prepare_random_{entity}.ts
- test/generate/generate_random_{entity}.ts
- test/features/api/{entity}/*.ts

### Test Results
- Total: X tests
- Passed: X
- Failed: 0