skills.rest
obra
obraCOMMUNITY
Explore all skills by this author →
WebsiteGitHub

Refactoring Safely

Enforce tests-before-refactoring discipline and separate structural changes from bug fixes.

41|27|Updated Oct 6, 2025
Search Tags:#code quality#testing#refactoring#git workflow#incremental
One-click install
npx skills add https://github.com/obra/clank --skill refactoring-safely-obra
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Refactoring Safely
Source: https://github.com/obra/clank/tree/main/skills/coding/refactoring-safely
Command: npx skills add https://github.com/obra/clank --skill refactoring-safely-obra

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill prevents dangerous refactoring practices that mix structural changes with bug fixes or new features, eliminating debugging nightmares and code regression.

Core Features & Use Cases

  • Tests-First Approach: Ensures automated test coverage exists and passes before any code modifications.
  • Incremental Refactoring: Breaks large refactoring tasks into single, testable changes with clear commit boundaries.
  • Use Case: When extracting multiple methods from a 300-line function, use this Skill to extract one method at a time, test after each change, and commit incrementally for safe deployment.

Quick Start

Use the Refactoring Safely skill to analyze this Python function and create a step-by-step refactoring plan with tests first.

Frequently Asked Questions about Refactoring Safely

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

FAQPage Schema
How do I refactor code safely without introducing bugs?▼

Refactor safely by ensuring automated tests exist and pass before making any structural changes. Break large refactoring tasks into single, testable increments—extract one method at a time, test after each change, and commit independently to isolate issues and enable safe rollback.

Why should I separate refactoring from bug fixes and feature work?▼

Mixing refactoring with bug fixes or features makes debugging difficult and obscures which change caused regressions. Keeping structural changes isolated in separate commits lets you identify the exact source of any problem and revert safely if needed.

What's the best way to extract methods from a large function?▼

Extract one method at a time using incremental refactoring: write or verify tests for the original function, extract a single method, test immediately, commit, then repeat for the next extraction. This approach prevents entangling multiple changes and makes each step reviewable.

Do I need tests before I start refactoring?▼

Yes. Tests must exist and pass before any refactoring begins. Automated test coverage serves as a safety net that confirms each structural change preserves behavior, preventing regressions that emerge only after deployment.

Can I refactor while fixing bugs in the same commit?▼

No. Refactoring and bug fixes must remain separate. Combining them obscures which change fixed the bug, complicates code review, and makes it harder to diagnose failures. Complete refactoring first with passing tests, then apply bug fixes in separate commits.

Related Skills

Explore More Software Engineering Skills→
thec3ukthec3uk

Testing Coverage

Analyze code coverage and generate tests to meet coverage standards.

Official
Basic
VeraticusVeraticus

refactoring

Refactor code incrementally with test-driven workflows and commit tracking.

Community
Advanced
AIAsysAIAsys
21

commit-history-audit

Audit Git commit histories for duplicate messages, stash commits, and stale branches.

Official
Intermediate
aniruddh2003aniruddh2003
1

speckit.checker

Run static analysis tools to detect security vulnerabilities, type errors, and linting issues.

Community
Intermediate