sfermanelli-refactor

Restructure existing code without changing external behavior to improve maintainability.

1|Updated Mar 19, 2026
One-click install
npx skills add https://github.com/sebafermanelli/sfermanelli-skills --skill sfermanelli-refactor
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: sfermanelli-refactor
Source: https://github.com/sebafermanelli/sfermanelli-skills/tree/main/sfermanelli-refactor
Command: npx skills add https://github.com/sebafermanelli/sfermanelli-skills --skill sfermanelli-refactor

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Restructure code to be better organized, more maintainable, and easier to extend — without changing its external behavior.

Core Features & Use Cases

  • Extract Method and Extract Class to reduce complexity and improve responsibility boundaries.
  • Replace Conditional with Polymorphism / Strategy to minimize branching and duplication.
  • Introduce Parameter Objects and Value Objects to improve API clarity and validation.
  • Split large files by concern to improve readability and maintainability.

Quick Start

Identify a large or complex function or class, then incrementally apply a single refactoring step (e.g., extract a method or class) and verify tests after each change.

Frequently Asked Questions about sfermanelli-refactor

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I refactor a large function with deep nesting without changing its behavior?

You refactor large functions safely by incrementally applying patterns like Extract Method to reduce complexity and improve maintainability without changing external behavior. Verify your existing tests after each change to ensure safe integration.

What is the best way to handle long parameter lists in legacy code?

The best way to handle long parameter lists is to introduce Parameter Objects and Value Objects, which improves API clarity and validation while preserving external behavior. This refactoring approach restructures legacy code for better maintainability.

How do I reduce complex conditional branching and duplicated logic in a class?

To reduce complex conditional branching and duplicated logic, apply the Replace Conditional with Polymorphism or Strategy pattern. This refactoring technique minimizes branching by restructuring code without changing its external behavior.

When should I split large files and extract new classes during a code refactor?

You should split large files by concern and use Extract Class when functions or classes have blurred responsibility boundaries. This refactoring improves readability and maintainability while ensuring external behavior remains unchanged.

Can I refactor legacy code safely if I have an existing test suite?

Yes, you can safely refactor legacy code with an existing test suite by applying incremental changes and verifying testing verification after each step. This ensures safe integration while restructuring code to improve maintainability.

What design patterns help improve code quality when restructuring legacy code?

Design patterns like Extract Method, Extract Class, Replace Conditional with Polymorphism, and Introduce Parameter Objects improve code quality by restructuring legacy code. They organize code better and make it easier to extend without changing behavior.