Can it help with modernizing old code?

Absolutely. It can identify outdated programming patterns and replace them with modern, more efficient syntax, such as converting traditional loops to functional patterns or adding modern type safety.

How does it identify what needs refactoring?

The skill uses pattern matching and complexity analysis to find 'code smells' like deeply nested blocks, oversized functions, or duplicated logic that make code hard to maintain.

Which refactoring patterns does it support?

It supports a wide range of patterns including Extract Method, Extract Class, Renaming for clarity, Moving Methods/Fields, Inlining, and replacing complex conditionals with guard clauses or polymorphism.

Does this skill change the behavior of my code?

No, the primary goal of this refactoring skill is to improve the internal structure and readability of your code while strictly preserving its external behavior.

Is it safe to use on production codebases?

Yes, it is designed for professional use. The skill follows a 'test-first' methodology, making incremental changes and verifying them against existing test suites to ensure stability.

Code Refactoring & Cleanup

Name: Code Refactoring & Cleanup
Author: cosmix

bycosmix

生産性とワークフロー

Restructures existing code to improve readability, maintainability, and performance without changing external behavior.

概要

This skill empowers Claude to systematically improve code quality by identifying technical debt and applying industry-standard refactoring patterns. It automates the detection of code smells—such as long methods, complex conditionals, and duplicated logic—and executes safe, incremental changes while prioritizing test coverage and functional integrity. Whether modernizing legacy codebases or simplifying complex logic, this skill ensures your software remains maintainable, efficient, and clean through proven techniques like method extraction and guard clause implementation.

主な機能

Modernization of legacy syntax to current language best practices
Incremental change management with integrated test verification steps
0 GitHub stars
Systematic application of refactoring patterns like Extract Method and Class
Simplification of nested conditionals using guard clauses and polymorphism
Automated code smell detection including cyclomatic complexity and code duplication

ユースケース

Reducing technical debt in rapidly grown projects by organizing large classes
Modernizing outdated JavaScript or Python codebases to use contemporary syntax
Simplifying complex legacy functions into modular, testable units

概要

主な機能

Modernization of legacy syntax to current language best practices
Incremental change management with integrated test verification steps
0 GitHub stars
Systematic application of refactoring patterns like Extract Method and Class
Simplification of nested conditionals using guard clauses and polymorphism
Automated code smell detection including cyclomatic complexity and code duplication

ユースケース

Reducing technical debt in rapidly grown projects by organizing large classes
Modernizing outdated JavaScript or Python codebases to use contemporary syntax
Simplifying complex legacy functions into modular, testable units