Please let me know if I can be of help to you.
Thanks for your question. The agreement that you sign as a buyer is a Buyer Broker Representation Agreement. The agreement allows the Realtor to represent you as your agent in the purchase of a property.
The Realtor's job is to find the property and negotiate the best price and terms for you. In most cases the property that you buy will NOT be listed by the Realtor's broker, but by another broker. If you want your Realtor to represent you at an auction, then I recommend discussing that with the Realtor during your preliminary consultation.
Best of luck!