It's irrelevant which tool does the checking. The problem is that you don't know whether "// go:generate foo", "//ho:generate bar" or "//go;generate baz" are errors or simply comments.

In order to detect most of that you'll have to redefine the comment syntax for the core language so it's no longer free-form but anything that looks like a comment-directive now triggers a warning (or most likely an error seeing the Go philosophy).