What is 'primitive obsession' in domain modeling?

Primitive obsession is the practice of using basic data types like Strings or Integers to represent domain concepts, such as an Email or OrderID. This skill helps replace them with specialized types that prevent invalid data from entering the system.

What is the 'parse, don't validate' approach?

Instead of checking data validity throughout your business logic, you parse raw input into a domain-specific type at the system boundary. Once the object exists, its type guarantees its validity throughout the application.

How does 'make invalid states unrepresentable' help developers?

By using the type system (like Enums or Sum types) to structure data, you ensure that illegal combinations of data literally cannot be represented in code, eliminating a major source of runtime bugs.

Can I use this skill for general code reviews or debugging?

No, this skill is specifically focused on domain integrity and type safety. It is not intended for general styling, formatting, or debugging tasks unrelated to domain modeling and type design.

Domain Modeling Expert

Name: Domain Modeling Expert
Author: jwilger

byjwilger

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开发者工具

Enforces domain-driven design principles to ensure type safety and prevent invalid application states at compile time.

The Domain Modeling skill empowers Claude to act as a Domain-Driven Design (DDD) specialist, guiding developers to move away from primitive obsession and toward rich, semantic domain models. It focuses on the 'parse, don't validate' pattern, making invalid states unrepresentable through the strategic use of type systems, and replacing ambiguous primitives with meaningful value objects. This skill is essential for creating codebases that are self-documenting and resilient to runtime errors by catching logic flaws at the compiler level rather than at runtime.

主要功能

01Identifies and refactors primitive obsession into robust value objects

02Converts ambiguous boolean state flags into exhaustive, type-safe enums

032 GitHub stars

04Enforces domain integrity with automated veto authority during design reviews

05Eliminates swappable parameter bugs using semantic newtype wrappers

06Implements the 'parse, don't validate' pattern for stronger system boundaries

使用场景

01Ensuring type safety and business logic consistency during TDD cycles

02Refactoring legacy code to replace raw strings and integers with domain-specific types

03Designing complex state machines where only valid transitions are representable

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jwilger/agent-skills domain-modeling

For use in Claude.ai and ChatGPT

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