level 2Bugs & Debugging
Regression
also: regressions, regressed
When something that used to work gets broken by a newer change.
a bit more technical
A defect where previously correct behavior stops working after a code or configuration change, usually in a part of the app the change wasn't meant to touch.
picture it
You fix a squeaky door hinge, and now the door won't lock. The lock worked yesterday. Your fix broke it.
why it matters
Agents change many files at once. A fix in one place can quietly break another. Asking for regression checks is how you catch that before your users do.
what your agent might say
Adding Google Sign-In caused a regression: the regular email login now fails. I'll fix that and check both ways of logging in work.
how you might use it
After adding Google Sign-In, test the existing email login flow for regressions before you tell me it's done.
common mistake
Thinking a regression is any bug. It's specifically something that worked before and broke because of a change.
builds on
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