Depends on the agent. Out of respect for you and your privacy, I would not demand to see them. However, we would want to provide "Proof of Funds" with the other documents, addendums, and purchase contract. You will find different agents have different tactics. Some will demand you sign a buyer broker agreement before showing you a property where as I would rather show my clients my level of professionalism and what they can expect from me before I ask such a thing.
Best of luck.