'Agency' in the Bible

“And through his shrewdnessHe will cause deceit to succeed by his influence;And he will magnify himself in his heart,And he will destroy many while they are at ease.He will even oppose the Prince of princes,But he will be broken without human agency.

Paul, an apostle (not sent from men nor through the agency of man, but through Jesus Christ and God the Father, who raised Him from the dead),

Why the Law then? It was added because of transgressions, having been ordained through angels by the agency of a mediator, until the seed would come to whom the promise had been made.