How does the Genesis account of God’s covenant with Abraham indicate the monergistic nature of the covenant?

I guess because the Abrahamic covenant is instituted by God without much reference to Abraham: he's just basically told this is how it's going to be. And the initial impression that the covenant is not exactly an equal arrangement is confirmed by the comparison, first made by Meredith Kline, between the OT covenants and other Ancient Near Eastern 'suzerainty-val' treaties, where one side was a conquering nation, and the other side had been brought into submission by conquest.