filter takes:
state: one state or a list.tags: items must have all of them.assignee:"me"for whoever’s looking, or"none".triaged: only items triage closed on its own.search: words in the title.
sort is lastSeen, firstSeen, occurrences, users, title or due, with a - in front for descending. layout and columns work like an inbox’s and default to it.
People can also save their own filters as personal views from any list. Those stay theirs and don’t need a deploy.
To count or list a view’s items on a page, use b.count(view) and b.items(view). See Pages.