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If you're asking an agent to clean something up, tell it where it's allowed to go. Which files it can touch, that behaviour can't change, and that it should stop and ask if it thinks something outside of that needs changing.
Otherwise it'll keep going until it decides it's
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Characterisation tests record what your code does today (not what you want it to do).
They're temporary and a bit ugly, but they'll quickly catch an agent changing behaviour mid-refactor when your normal suite won't.
Your agent can write them for you in a couple of minutes. We
In the age of agentic engineering, refactoring is disappearing from git history. GitClear's latest report puts moved lines at 3.8% of code changes so far this year, down from 21% in 2022.
Agents write a lot of code, but they don't go back and tidy up unless you ask them to.