Tags archive page

I have tags on a post. If I click on the link for that tag to display a list of all posts with that tag, it is considered an archive. I want that archive to display text similar to a search query. Something like, You are viewing all posts tagged with “[tag]”.

The long way to do this would be is_tag and put conditions for every tag I create. I want something simpler and smarter where it displays the tag like the_search_query does.