Caps how many billed job rows this run delivers -- not the array-length runtime guardrail (this Actor has no array input to cap; it was legitimately exempted from that at first ship), a buyer-facing row cap for a predictable bill on a source whose real card count (15-17 typically) is otherwise fixed by the page, not by you. Default 15 is close to a full page's real yield, so most runs return everything the page has; raise it for headroom on a wider query, lower it for a stricter ceiling. Enforced on the charge itself: once this many rows are billed, further real cards on the page are read but never charged for or delivered, and the run's OUTPUT/summary row says so plainly (status 'limited') rather than reporting the page as empty.
Minimum:1
Maximum:50
Default:15