🧟
AutomationNewFree
Working With Legacy Code
Safely change and test untested codebases. (For developers.)
Part of Book skills by @wondelai ↗Applies Michael Feathers's techniques for adding tests and safely changing legacy, untested code.
What it does
- Gets untested legacy code under test.
- Makes safe changes without breaking things.
How to install (2 minutes)
- 1Download the .zip and unzip it — you’ll get a folder called working-with-legacy-code.
- 2In the Claude app: open Settings → Capabilities → Skills, choose Add / Upload, and select the folder (or the .zip).
- 3In Claude Code: drop the folder into your project’s .claude/skills/ directory, then type /skills to confirm it loaded.
- 4That’s it — the skill activates on its own when it fits what you’re doing.
Want to get the most out of your new skill?
Inside Hands-On AI Club we show you exactly how to use skills like this in real work — with step-by-step courses and a community to help you.