Hooray, it works! (after plenty of wasted time and frustration) I nominate for an all-access pass to the docs.Suddenly I understand why there's so many similar confused questions from others (and who knows how many just "gave up" without asking - like me on my first few tries.) In retrospect it's obvious that the wrapper object needs to be included but, as you pointed out, a big issue is that the docs explicitly state "When building a filter from scratch, the none built-in filter is useful" I figured that applied to me - is there any other way I would build when first starting out?!

Hmm, no activity here for an awfully long time; is it safe to assume that the extension is no longer supported, or maybe I'm in the wrong place? I signed in with a token, successfully received one inbox notification from the extension, and they haven't shown up since.