Domain Driven Design

What it does

This skill enables an AI agent to analyze complex business problems and model software solutions using Domain-Driven Design (DDD) principles. It facilitates the identification of core domain concepts, separation of domain logic from infrastructure, and the creation of rich domain models with behavior. The skill provides a quick reference guide to DDD building blocks like Entities, Value Objects, Aggregates, Services, Repositories, Events, Factories, Specifications, and Modules.

When to use it

• When facing complex business requirements that need careful modeling.
• To design software systems where the domain logic is central and needs clear separation from technical details.
• For projects requiring a structured approach to defining and managing subdomains within a larger system.
• When needing to establish a "ubiquitous language" – a shared vocabulary between developers and domain experts.

Key capabilities

• Entity Modeling: Defining entities with identity and mutable state.
• Value Object Modeling: Creating immutable value objects.
• Aggregate Identification: Grouping related entities into aggregates.
• Domain Service Implementation: Implementing services to encapsulate complex business logic.
• Repository Abstraction: Defining repositories for data access.
• Domain Event Handling: Defining and managing domain events.

Example prompts

• "Can you help me model an 'Order' entity using DDD principles?"
• "What are the key considerations when defining aggregates in a payment processing system?"
• "Explain how to implement a Domain Service for calculating pricing."
• "Show me an example of a Value Object representing money."

Tips & gotchas

• The skill provides a quick reference; consult Read("${CLAUDE_SKILL_DIR}/references/entities-value-objects.md") for complete patterns and more detailed information.
• Value Objects must be frozen (immutable) to adhere to DDD principles.