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:

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

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

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