ReddRadar
Agent skill
domain-driven-design
Apply Domain-Driven Design patterns. Use when modeling complex business domains, defining bounded contexts, or designing aggregates. Covers entities, value objects, and repositories.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/domain-driven-design-dralgorhythm-claude-agentic-frame
SKILL.md
Domain-Driven Design
Core Concepts
Ubiquitous Language
Use the same terminology as domain experts. Code should read like business documentation.
Bounded Context
A boundary within which a particular domain model is defined and applicable.
Context Map
Shows how bounded contexts relate to each other.
Building Blocks
Entity
Has identity that persists over time. Equality based on ID.
class User {
constructor(
public readonly id: UserId,
public email: Email,
public name: string
) {}
}
Value Object
Immutable, equality based on attributes.
class Email {
private constructor(public readonly value: string) {}
static create(value: string): Email {
if (!value.includes('@')) {
throw new Error('Invalid email');
}
return new Email(value);
}
equals(other: Email): boolean {
return this.value === other.value;
}
}
Aggregate
Cluster of entities and value objects with a root entity.
class Order { // Aggregate Root
private items: OrderItem[] = [];
addItem(product: ProductId, quantity: number): void {
// Business rules enforced here
this.items.push(new OrderItem(product, quantity));
}
get total(): Money {
return this.items.reduce((sum, item) => sum.add(item.subtotal), Money.zero());
}
}
Repository
Abstracts data access for aggregates.
interface OrderRepository {
findById(id: OrderId): Promise<Order | null>;
save(order: Order): Promise<void>;
}
Domain Event
Something that happened in the domain.
class OrderPlaced {
constructor(
public readonly orderId: OrderId,
public readonly userId: UserId,
public readonly occurredAt: Date
) {}
}
Strategic Patterns
Anti-Corruption Layer
Translate between your model and external systems.
Shared Kernel
Shared subset of domain model between contexts.
Customer-Supplier
Upstream provides what downstream needs.
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