This is the main review skill in the diffity suite. Point it at a git ref (like main..feature or HEAD~3) and it leaves inline comments on your diff. You can optionally focus the review on specific areas like security, performance, naming, errors, types, or logic. If you don't specify, it reviews everything. It's part of a larger workflow where you can view diffs in the browser with diffity-diff, then review them with this, and resolve comments with diffity-resolve. The focused review modes are nice when you want feedback on one dimension without noise about everything else.
npx skills add https://github.com/kamranahmedse/diffity --skill diffity-review