name: create-service description: Guide for creating services in the backend. Use when asked to create a service layer component. Directs to the appropriate service skill based on the type of service needed.

Create Service

Services contain business logic and orchestrate operations between repositories, external APIs, and other services.

Service Types

There are two types of services in this architecture:

Which Skill to Use?

Use create-resource-service when:

• Creating a service for a domain entity (Note, User, Course, etc.)
• The service will perform CRUD operations via a repository
• The service needs authorization checks per operation
• The service should emit events for real-time updates
• You've already created the schema and repository for this entity

Example: NoteService, UserService, CourseService

Use create-utility-service when:

• Creating a service for cross-cutting concerns
• The service calls external APIs (auth service, payment gateway, etc.)
• The service provides shared functionality used by other services
• The service doesn't directly map to a domain entity

Example: AuthenticationService, AuthorizationService, EmailService, NotificationService

Service Layer Principles

Regardless of type, all services follow these principles:

1. Business logic lives here - Not in controllers or repositories
2. Dependency injection - Inject dependencies via constructor
3. Throw domain errors - Use errors from @/errors (not HTTP errors)
4. User context - Accept AuthenticatedUserContextType where needed
5. Return domain types - Return schema types, not HTTP responses

File Naming

Location: src/services/{service-name}.service.ts

See Also

• create-resource-service - CRUD services for entities
• create-utility-service - Cross-cutting/specialized services
• add-resource-events - Add real-time events to a resource service