What would you like to see in a code review tool?

Hello All, I'm building a code review tool to help automatically spot issues and to improve the overall experience. I was wondering what other developers would like to see? Some features I've already added or will add include: spell checking, ability to diff moved code, checks for accidental commits, checking for parse errors (including validating HTML), checking for security issues (committed secret keys, packages with vulnerabilities), checking for copy/pasted code, checking that files and functions aren't too large or complex, supporting bookmarks in reviews, checking for invisible+confusable characters, and creating a single place to show active reviews.