domain-driven-design

SKILL.md

This skill provides guidance for domain modeling based on Rich Hickey's data-oriented design principles and Scott Wlaschin's type-driven design approach. Focus on building systems that make illegal states unrepresentable, prioritize data and transformations over objects and methods, and establish a ubiquitous language that bridges technical implementation and business domain.

Aggregate: A cluster of entities and value objects treated as a single unit for data changes.

Aggregate Root: The single entity through which all external access to the aggregate must pass.

This skill should be used whenever domain modeling is taking place. It provides specialized guidance for type-driven and data-driven design based on Rich Hickey and Scott Wlaschin's principles. The skill helps contextualize current modeling within the existing domain model, identifies inconsistencies, builds ubiquitous language, and creates visualizations (Mermaid, Graphviz/DOT, ASCII diagrams) to communicate domain concepts clearly. Use this skill when designing types, modeling business domains, refactoring domain logic, or ensuring domain consistency across a codebase. Source: bfollington/terma.

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