Klirry is read-only against your ad account. There is no pixel, no automatic pause and no automatic scaling.
Why
Working out which ad got the credit for a sale, and the ad platforms' own learning phases, are both fragile, and the person who knows the full context is you, not a bot. Klirry tells you what the numbers say and what it would do; you decide.
Technically the connection cannot write either: it uses a token (a read-only password) with the ads_read permission only, and Klirry's code has no operation that changes an ad. See connecting Meta ads.
The Learning label
A new ad, or one whose budget just changed, is marked Learning and gets a quiet period of 14 days before any verdict. While it waits you see the message "gathering data — decision in ~N days", or just "gathering data" when Klirry cannot estimate the time.
Nothing needs to be done in the meantime.