I spent the last few months building an AI code reviewer, solo. It's now live on the GitHub Marketplace, which feels like a good moment to write the honest version of what these tools catch, what they don't, and the embarrassing bug that almost made mine useless. The problem that started it AI coding assistants made everyone faster — and quietly broke code review. More code, more PRs, landing faster than any lead can review in depth. When a stack of PRs is piling up, humans skim.