A team turned on agent mode a month ago. First week, ecstatic. Shipping faster than they had in years. Second week, incidents started showing up. Third week, they were ready to blame the tool. Then their senior pulled up the logs. Found the bug. Traced it back. The function had been broken since 2019. The AI just called it correctly for the first time in years. The room went quiet. They had shipped around that broken function for six and a half years. Workarounds in three services. Documented in runbooks. Never fixed because it never broke loud enough to matter. The fragility was always there. They had learned to dance around it so well they stopped seeing it. The AI didn't create the problem. It walked into a house of cards and accidentally leaned on a wall. The Pattern Keeps Showing Up I was on a call last month with a team that's all in on AI. Slack full of celebration emojis. Pull requests flying. Shipping faster than ever. And their most senior engineers were terrified. Monorepo with submodules.…