In two browser releases, Google's AI agents identified and helped repair over a thousand security vulnerabilities in Chrome—including a flaw that had quietly persisted for thirteen years—marking a threshold moment in how software defends itself. The machines do not act alone: human developers retain final authority over every fix, and the architecture is carefully bounded. What is unfolding is less a replacement of human judgment than an expansion of human reach, a partnership between tireless algorithmic attention and the wisdom required to know what truly matters.