I find the current text ambiguous: does it mean that these tags cannot be used in other categories, or that these are the only tags that can be used in the category? It’s the latter, and I think the text could better convey this.
「いいね！」 3
I know this can be edited on a per-site basis, but I think this is probably a change worth making across the board.
I’ve therefore made a PR for it:
「いいね！」 4
@neil has the most experience with this and can make the call.
「いいね！」 2
I like it, except I’d make the last one say “within these tag groups” to make sure it’s not confused with our user groups.
「いいね！」 3
Just a short off topic comment, your mouse handwriting is spectacularly awesome!
「いいね！」 9