Jacob knew Esau would ask three questions, so he wrote the answers in advance. Targum Pseudo-Jonathan preserves the briefing given to the first servant in the caravan (Genesis 32:18): "When Esau my brother meets you and asks, Whose are you, and where are you going, and whose are these before you?"
Three questions. Ownership, direction, purpose. These are the questions any raider would ask, and any servant caught unprepared would stumble. Jacob would not let his men stumble. He rehearsed them.
Why scripting matters
The rabbis read this as a lesson in responsibility toward those who serve under you. Jacob did not simply hand his men a fortune in animals and send them into the path of a man with four hundred swords. He equipped them. He imagined the encounter from their point of view and put the right words on their tongues before they needed them.
There is a theology here too: even in the moment of direst prayer, Jacob did not stop doing the practical work. He prayed, he prepared, he scripted. The Talmud would later formalize this balance (Berakhot 32b): hishtadlut, human effort, and tefillah, prayer, are partners, not substitutes.
The takeaway: prayer that does not also script the hard conversation is only half the work.