Prompt

Design hexagonal (ports & adapters) architecture.

<application_core>
{describe core business functionality}
</application_core>

<external_dependencies>
{list all external systems/services}
</external_dependencies>

<technology_choices>
{describe tech stack constraints}
</technology_choices>

Design hexagonal architecture:
1. Identify ports (interfaces)
2. Implement adapters
3. Define domain model
4. Create application services
5. Handle dependency inversion
6. Test with mock adapters

Focus on testability and flexibility.