I dont know but after the last update the Antigravity Output reduce. Means even i try to told just go for this file and this line it again and again ready other files and waste token. like i wont listen.
And i think google reduce the token even with the Flash low it take like hell of token in 1 or 2 hour it end.
and no good output. in the Pro plan.
on the other side the cursor is far superiors even in the free plan
sounds frustrating, if its ignoring scope and touching files you didnt ask about, thats what burns tokens for nothing. try being more explicit in your instructions about restricting scope, like directly saying do not open or edit other files. if it keeps happening and its clearly worse since the update, worth flagging it as a regression with a quick before/after example so its easy to spot.