refactor

Refactor code in small, test-backed steps to preserve behavior.

Updated Mar 11, 2026

Search Tags:#code quality #type safety #refactoring #design patterns #maintainability #code smells #test driven

Ready to run

npx skills add https://github.com/selfagency/agentsy --skill refactor-selfagency

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: refactor
Source: https://github.com/selfagency/agentsy/tree/main/.agents/skills/refactor
Command: npx skills add https://github.com/selfagency/agentsy --skill refactor-selfagency

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill solves the problem of maintaining and improving existing code that has become hard to understand, change, or extend without breaking its current behavior.

Core Features & Use Cases

Behavior-preserving restructuring: Break up large functions, rename for clarity, extract methods/classes, and remove code smells while keeping outputs consistent.
Maintainable design improvements: Reduce duplicated logic, eliminate magic numbers, simplify nested conditionals with guard clauses, and improve type safety.
Safe refactoring workflow: Refactor in small steps with tests, committing frequently, and validating via automated and manual checks.

Quick Start

Use the refactor skill when you want to clean up a messy function while ensuring behavior stays identical by making small, test-backed changes.

Frequently Asked Questions about refactor

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

FAQPage Schema

How do I refactor long functions without changing external behavior?▼

To refactor long functions without altering behavior, you must apply behavior-preserving restructuring by making small, incremental changes backed by automated tests and frequent commits to validate consistency.

What is the best way to remove code smells like duplicated logic and magic numbers?▼

Removing code smells like duplicated logic and magic numbers requires applying common refactoring operations and checklists to improve maintainability and readability while keeping outputs identical.

How do I simplify nested conditionals to improve code maintainability?▼

Simplifying nested conditionals to improve code maintainability involves extracting methods and replacing complex logic with guard clauses, ensuring the refactoring steps are small and test-backed.

Can I improve type safety and reduce god modules during a safe refactoring workflow?▼

Yes, you can improve type safety and reduce god modules during a safe refactoring workflow by breaking up large functions and extracting classes in small steps, validating outputs via automated and manual checks.

Does test driven refactoring require committing changes after every step?▼

Test driven refactoring requires committing changes frequently after every small step to ensure the restructuring maintains external behavior and to reduce the risk of future changes breaking the codebase.

When should I not use a behavior-preserving refactoring approach?▼

You should not use a behavior-preserving refactoring approach when you actually need to alter external behavior, as this technique focuses strictly on cleaning code and solving maintainability issues without changing outputs.