I am building with AI as a startup. In most case I used Codex, sometime claude. Vibe coding is so much fun. Just let Sol-Ultra to decide whether we need a sub-agent. Yes, I built an AI browser which in the previous I would never imagenate I can do this, I am an mobile developer, none of web experience, none of chromium knowledge. But as my project, it seems users like the video download feature than all the AI skill I have put inside the browser project. LOL so you built something with AI but you will find it might not be the user case.