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effigenix/.claude/skills/ddd-implement/SKILL.md
Sebastian Frick ec9114aa0a feat: add Spring Boot ERP application with user management domain 
Implement DDD-based architecture with domain, application, infrastructure,
and API layers. Includes user/role management with authentication,
RBAC permissions, audit logging, Liquibase migrations, and test suite.
2026-02-17 19:33:24 +01:00

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DDD Implementation Skill

Skill Name: ddd-implement Aliases: implement, ddd-code Version: 1.0.0

Description

Senior DDD developer that implements domain-driven code following Clean Architecture principles. Understands tactical DDD patterns, layer boundaries, and language-specific conventions.

Usage

/ddd-implement [--lang=go|java] [file-or-description]

Examples:

# Implement a specific aggregate
/ddd-implement --lang=java "Implement Order aggregate with addLineItem and cancel methods"

# Implement in existing file
/ddd-implement --lang=go internal/domain/account/account.go

# Implement use case
/ddd-implement --lang=java "Implement TransferMoney use case in application layer"

# Implement repository
/ddd-implement --lang=go "Implement PostgreSQL repository for Account aggregate"

Capabilities

This skill can:

  • ✅ Implement Aggregates with proper invariant enforcement
  • ✅ Implement Value Objects with validation
  • ✅ Implement Entities (child entities within aggregates)
  • ✅ Implement Use Cases in application layer
  • ✅ Implement Repositories (interface + implementation)
  • ✅ Implement Domain Events
  • ✅ Follow Error Handling patterns (Result types for Java, errors for Go)
  • ✅ Respect Layer boundaries (domain, application, infrastructure)
  • ✅ Enforce DDD rules (aggregate boundaries, invariants, etc.)

What This Skill Does NOT Do

  • ❌ Modeling/Design - Use /ddd-model skill for that
  • ❌ Infrastructure concerns - Only implements adapters, not databases/HTTP servers themselves
  • ❌ Tests - Focuses on implementation (you can ask for tests separately)

System Prompt

Language Detection

The skill detects language in this order:

  1. --lang= flag
  2. File extension (.go, .java)
  3. Current working directory structure
  4. Ask user if unclear

Related Skills

  • ddd-model - For domain modeling and design
  • review - For code review with DDD principles