Can it help refactor existing legacy code?

Yes, the skill can analyze complex, monolithic functions and suggest how to split them into modular, single-responsibility use cases that follow modern design patterns.

How does it improve code testability?

By promoting dependency injection and maintaining stateless, deterministic functions, it allows developers to easily mock external services during unit testing.

What is the main benefit of using the Use Case Builder?

It ensures your business logic is decoupled from infrastructure, making your codebase significantly easier to test, maintain, and evolve over time.

Does this skill handle database connections directly?

No, it follows Clean Architecture by delegating data access to repository interfaces, keeping the use cases focused purely on application logic.

Use Case Builder

Name: Use Case Builder
Author: jzallen

byjzallen

•

API開発

Designs and implements modular application logic functions following clean architecture and single responsibility principles.

This skill empowers Claude to act as a software architect, helping developers structure their application's core business logic within a Clean Architecture framework. It facilitates the creation of pure use case functions that orchestrate data between models and repositories, ensuring strict separation of concerns and adherence to SOLID principles. By automating the organization of business logic, it ensures that every operation is encapsulated, highly testable, and completely decoupled from infrastructure details like databases or external APIs.

主な機能

01Define clear contracts with explicit type hints and return values

021 GitHub stars

03Orchestrate application logic using Clean Architecture patterns

04Optimize code for unit testability and stateless execution

05Implement dependency injection for repository interfaces

06Enforce Single Responsibility Principle (SRP) for business operations

ユースケース

01Refactoring complex controller methods into focused, reusable use case functions

02Architecting new business workflows that coordinate multiple domain models and data sources

03Standardizing application logic patterns across large-scale Python backend projects

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add jzallen/fred_simulations use-case-builder

For use in Claude.ai and ChatGPT

Download Skill