name: create-api-module description: Creates a new API module following Clean Architecture with TDD. Use when adding new API endpoints, creating backend features, implementing domain entities, or when the user says "create module", "add endpoint", "new backend feature". allowed-tools: Read, Write, Edit, Glob, Grep, Bash(uv run pytest:), Bash(docker compose exec:)

Create API Module

Creates a new backend module following Clean Architecture with API, Domain, and Infrastructure layers.

Workflow

1. Create directory structure at back/src/api/{module}/
2. Create infrastructure layer: models, repository (interface + implementation), dependencies
3. Create domain layer: business logic functions, exceptions
4. Create API layer: router, schemas
5. Register router in back/src/api/routes.py
6. Create tests in back/tests/api/{module}/
7. Create migration: docker compose exec back uv run alembic revision --autogenerate -m "Add {module} table"

Directory Structure

back/src/api/{module}/
├── api/
│   ├── router.py         # FastAPI endpoints
│   └── schemas.py        # Pydantic request/response models
├── domain/
│   ├── exception.py      # Domain exceptions
│   └── {action}.py       # Business logic functions
└── infrastructure/
    ├── models.py         # SQLModel database models
    ├── repository.py     # Repository interface + implementation
    └── dependencies.py   # FastAPI dependency injection

Quick Scaffold

Generate boilerplate structure:

python .claude/skills/create-api-module/scripts/scaffold_module.py {module_name}

Code Patterns

For detailed code patterns, see PATTERNS.md.

Real Examples

For complete working examples from this codebase, see EXAMPLES.md.

Important Conventions

• Table names: plural, lowercase (items, users, notifications)
• Model class names: {Entity}Db (ItemDb, UserDb)
• Router names: {entity}_router (item_router, user_router)
• Test names: test_when_{condition}_then_{outcome}
• Always use UUID for primary keys
• Soft delete: Use deleted_at field instead of hard delete
• Type hints: Required everywhere, use | for union types (not Optional)

After Creating Module

1. Run tests: uv run pytest tests/api/{module}/ -v
2. Format code: task format
3. Create migration if needed
4. Test endpoints via /docs locally