What is the focus of the 'Ubiquitous Language' feature?

It helps synchronize terminology between domain experts and developers, ensuring that the code mirrors the business reality and reducing communication overhead.

Which programming paradigms does this support?

While it draws heavily from functional programming concepts like Railway-Oriented Programming, the principles are applicable to any language supporting strong typing or structured data.

Does it support visual documentation?

Yes, the skill can generate Mermaid, Graphviz/DOT, and ASCII diagrams to visualize domain entities, workflows, and state transitions.

How does this skill improve code reliability?

It leverages type-driven design to ensure that invalid business states are impossible to represent in your code, significantly reducing logic errors and edge-case bugs.

Domain-Driven Design (DDD) & Type Modeling

Name: Domain-Driven Design (DDD) & Type Modeling
Author: bfollington

bybfollington

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API Development

Applies domain-driven and type-driven design principles to build robust business models and eliminate illegal states in software architecture.

This skill empowers developers to architect systems using advanced domain modeling techniques inspired by Rich Hickey's data-oriented design and Scott Wlaschin's functional type-driven approach. It helps identify domain inconsistencies, establishes a ubiquitous language across the codebase, and visualizes complex business logic using Mermaid or Graphviz. Whether you are refactoring legacy logic or designing a new service from scratch, this skill ensures your domain model remains pure, data-centric, and perfectly aligned with business requirements.

Key Features

0131 GitHub stars

02Detection of 'primitive obsession' and representational inconsistencies.

03Tools for building ubiquitous language and shared domain glossaries.

04Structural analysis of Bounded Contexts, Aggregates, and Aggregate Roots.

05Automatic generation of Mermaid, Graphviz, and ASCII domain visualizations.

06Expert guidance for type-driven and data-oriented design patterns.

Use Cases

01Visualizing existing domain relationships to facilitate communication between technical and business stakeholders.

02Architecting new microservices by defining clear Bounded Contexts and Aggregate boundaries.

03Refactoring complex business logic to make illegal states unrepresentable in the type system.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add bfollington/terma domain-driven-design

For use in Claude.ai and ChatGPT

Download Skill