This article explains how to get more from a Google Ads agency by agreeing on...

https://milosinspiringjournals.talesignal.com/posts/how-do-i-tell-if-an-agency-is-optimizing-or-just-busy

This article explains how to get more from a Google Ads agency by agreeing on business goals, setting up reliable tracking before increasing spend, and judging campaigns by lead quality, not just volume