I discovered an entertaining new failure mode. For a work like http://archiveofourown.org/works/575365/ (Jeeves & Wooster, tagged as if Bertie were doing the tagging himself, completely delightful and containing about a hundredweight of cucumbers), the valiant attempt to include all tags results in a woeful "Request URI is too long".

I'm planning to add a bookmarklet that does *not* attempt to pull in ALL THE TAGS, but if you can figure out how to make it cap the tags when it's going to overflow...