How does this skill help with software testing?

By separating pure logic from effectful operations, it allows you to unit test your business rules in isolation while using integration tests for the 'Edge' layers like routers and repositories.

Why does the skill recommend a bottom-up implementation order?

Starting with Entities and moving toward Routers ensures that each layer has its dependencies already defined, creating a stable and logical development workflow.

Is this skill compatible with web frameworks like Express or NestJS?

Yes, the patterns provided are framework-agnostic. The 'Effectful Edge' is where you implement framework-specific code, keeping your core business logic clean and portable.

What is the 'Functional Core' in this skill?

The functional core consists of pure, deterministic entities and services that contain all business logic and validation without any IO operations or side effects.

Atelier Spec Architect

Name: Atelier Spec Architect
Author: martinffx

bymartinffx

•

API 开发

Architects robust software systems using Domain-Driven Design and hexagonal patterns to separate business logic from infrastructure concerns.

This skill provides a structured framework for building maintainable applications by enforcing a functional core and an effectful edge. It guides Claude to model domains with pure entities, orchestrate workflows through stateless services, and isolate IO operations within repositories and routers. Ideal for complex feature design and spec-driven development, it ensures high testability and clear component responsibilities through a systematic bottom-up implementation strategy that follows a strict dependency chain.

主要功能

01Provides a standardized Component Matrix for clear responsibility mapping

02Implements Domain-Driven Design (DDD) patterns for robust domain modeling

03Guides systematic task breakdown using bottom-up dependency ordering

04Defines a 'Functional Core' for pure, deterministic, and highly testable business rules

05Enforces Hexagonal Architecture to decouple business logic from external dependencies

066 GitHub stars

使用场景

01Architecting new backend services with a focus on separation of concerns and testability

02Designing complex business features with clear domain boundaries and validation logic

03Refactoring legacy code into a more maintainable, testable hexagonal structure

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add martinffx/claude-code-atelier atelier-spec-architect

For use in Claude.ai and ChatGPT

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