domain-driven-design SKILL.md skillA

domain-driven-design from rrezartprebreza/spring-boot-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add rrezartprebreza/spring-boot-skills/domain-driven-design@git:20260921.09d9b78

Pins git:20260921.09d9b78 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

rrezartprebreza/spring-boot-skills

Path

skills/spring-boot-3/domain-driven-design/SKILL.md

Versions recorded

2

Latest version

git:20260921.09d9b78, committed Sep 21, 2026

First version recorded

Jul 4, 2026

Size

8,369 bytes

Repository stars

338

License

MIT

Use when evolving aggregate invariants, value objects or domain events in an existing DDD-style Spring Boot 3 application, or when DDD is explicitly requested. Preserve existing API identifiers and architecture when changing domain behavior.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Domain-Driven Design

## Aggregate Rules
- One repository per aggregate root
- External code only accesses aggregate through root — never child entities directly
- Prefer references by ID across aggregate boundaries; preserve deliberate mappings.
- Choose boundaries from invariants that must commit atomically and expected contention,
  not a fixed number of child entities. Splitting requires an explicit consistency plan.

The snippets are illustrative and require the application's domain types and imports.
Keep existing public identifiers and persistence mappings unless the task includes a migration.

```java
// ✅ Aggregate root controls all access to children
order.addItem(productId, quantity); // through root
order.removeItem(itemId);           // through root

// ❌ Direct child access from outside
order.getItems().add(new OrderItem(...)); // bypasses invariants
```

## Value Objects

Immutable, no identity, equality by value:

```java
public record Money(BigDecimal amount, Currency currency) {
    public Money {
        if (amount.compareTo(BigDecimal.ZERO) < 0)
            throw new IllegalArgumentException("Amount cannot be negative");
…

Read the whole file at its exact version.

How to install

mdr add rrezartprebreza/spring-boot-skills/domain-driven-design@sha256:5cbc8c070994e149

[![mdr](https://markdownregistry.com/badge/art_gjbdmr43gtnng6nc.svg)](https://markdownregistry.com/a/art_gjbdmr43gtnng6nc)

Versions

The registry has recorded 2 versions of this file, between Jul 4, 2026 and Sep 21, 2026, about one every 79 days.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_gjbdmr43gtnng6nc
GET https://markdownregistry.com/api/v1/resolve?ref=rrezartprebreza/spring-boot-skills/domain-driven-design
GET https://markdownregistry.com/api/v1/blob/5cbc8c070994e149ccb02c38bcbcb987e71e9b67e3a12066802dce3435cb82dc

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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