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Modernize and improve legacy codebases while maintaining functionality. Use when you need to refactor old code, reduce technical debt, modernize deprecated patterns, or improve code maintainability without breaking existing behavior.
Implement Role-Based Access Control (RBAC), permissions management, and authorization policies. Use when building secure access control systems with fine-grained permissions.
Implement WCAG 2.1/2.2 accessibility standards, screen reader compatibility, keyboard navigation, and a11y testing. Use when building inclusive web applications, ensuring regulatory compliance, or improving user experience for people with disabilities.
Test web applications for WCAG compliance and ensure usability for users with disabilities. Use for accessibility test, a11y, axe, ARIA, keyboard navigation, screen reader compatibility, and WCAG validation.
Plan and execute effective sprints using Agile methodologies. Define sprint goals, estimate user stories, manage sprint backlog, and facilitate daily standups to maximize team productivity and deliver value incrementally.
Implement comprehensive alert management with PagerDuty, escalation policies, and incident coordination. Use when setting up alerting systems, managing on-call schedules, or coordinating incident response.
Develop native Android apps with Kotlin. Covers MVVM with Jetpack, Compose for modern UI, Retrofit for API calls, Room for local storage, and navigation architecture.
| name | refactor-legacy-code |
| description | Modernize and improve legacy codebases while maintaining functionality. Use when you need to refactor old code, reduce technical debt, modernize deprecated patterns, or improve code maintainability without breaking existing behavior. |
This skill helps you systematically refactor legacy code to improve maintainability, readability, and performance while preserving existing functionality. It follows industry best practices for safe refactoring with comprehensive testing.
First, analyze the legacy code to understand:
# Review the codebase structure
tree -L 3 -I 'node_modules|dist|build'
# Check for outdated dependencies
npm outdated # or pip list --outdated, composer outdated, etc.
# Identify code complexity hotspots
# Use tools like:
# - SonarQube for code smells
# - eslint for JavaScript
# - pylint for Python
# - RuboCop for Ruby
Detailed implementations in the references/ directory:
| Guide | Contents |
|---|---|
| Code Assessment | Code Assessment |
| Establish Safety Net | Establish Safety Net |
| Incremental Refactoring | Incremental Refactoring |
| Modernize Patterns | Modernize Patterns |
| Reduce Dependencies | Reduce Dependencies, Documentation |
| Complete Refactoring Example | Complete Refactoring Example |
| Benefits Achieved | Benefits Achieved |