AIDA's Settings AI Features form blocked Save with a "Select a model" error right after switching providers. The real defect sat two React commits away, inside a hidden native select Radix uses to bridge into native form submission — and it never raised an error of its own.
A Google Reviews listing-confirm route taught me that 'it saved' and 'everything it triggered afterward also worked' are two different claims, and a response body should never merge them into one.
Fixing a cross-tenant IDOR taught me that 'access denied' and 'does not exist' are the same message when the requester should never learn which one is true.
Two POS terminals sell the last unit in the same second. Inventory survives that only if every stock mutation goes through one function, one advisory lock, and one idempotency key — and if sub-cent rounding residue dies the moment stock hits zero.
AIDA classifies support tickets with an LLM, so the classifier has to treat every ticket as a potential attack. The fence around the ticket text is real, but it isn't the guarantee — the guarantee is that a successful attack still can't do anything.