Our AI builder said "done" when the output matched a regex Zugo, a tool that turns a sentence into a running app, has improved its build verification by replacing a regex check for a closing HTML tag with an in-frame error listener. The new system injects a script into the generated document to report errors via postMessage, distinguishes console warnings from failures, and ensures that once a build is marked bad, it cannot be marked good again. This addresses the issue where builds were falsely marked successful even if the page failed to render. We build Zugo https://zugo.dev , which turns one written sentence into a running game, site or app. For a while, the thing that decided whether a build had succeeded was this: function htmlComplete text { return /<\/html /i.test text ; } A closing tag. That was the gate. If the model emitted