Never fix a bug without having first written a red test.

Never just write code. Always write red tests first.

In fact you can do even better and have your agent write end-to-end tests first as acceptance tests, have it witness them fail, then have it do red/green at the unit/component/integration level. Once it’s done the e2e tests pass, have it send the code off for linting and self-review.

If you are vigilant you’ll end up with a trustworthy validation suite. And with that (especially with e2e coverage), you can refactor and rewrite as much as you like.