When to use this skill

Use this skill whenever the user wants to:

Structure a project using COLA architecture (Adapter, Application, Domain, Infrastructure)
Apply COLA's layered architecture with clear responsibilities per layer
Implement domain-driven design with COLA while keeping the domain layer pure and dependency-inverted
Organize Java/Spring Boot projects following COLA V5 conventions

How to use this skill

Understand the layer responsibilities: Adapter handles I/O; Application orchestrates use cases; Domain holds business logic; Infrastructure implements persistence and external services
Set up the package structure following COLA conventions
Enforce dependency direction: Domain depends on nothing; Application depends on Domain; Adapter and Infrastructure depend on Application and Domain
Define ports in Domain or Application, implement them in Infrastructure