The details of how Satan and God interacted isn't the point to the story.
And why not, alley? To me, that is an important point of the story. God and Devil are supposed to be the worst of enemies, yet when Devil wanted to do something, he approached God.
Now, if you wanted to do something, would you approach your worst enemy for help, for permission? No way, you would do it without any reference to your worst enemy, or not do it at all.
Yet Devil asked God if it is OK if Devil tested one of God’s followers, Job. And God agreed. Now again ask yourself, if your worst enemy comes to you and asks if it is OK if he tests the martial faithfulness of your wife, would you agree? No way, you would tell the creep to get lost, no matter how confident you are that your wife won’t stray.
Yet God agreed with Devil, that the Devil may test Job, why? If God wanted to test Job, why didn’t he do it himself? It is not as if God has not done truly horrible, destructive deeds, he has done plenty. So why not test Job himself, why let Devil do it?
The only conclusion I can draw from that is that God and Devil work together, cooperatively. They are not enemies, but friends.