Learn how to properly fill out all of the residential listing contract documents and everything associated with it. What's included in a listing agreement?What's included in a listing agreement? A listing agreement is a legally binding contract between a homeowner and the real estate agent or broker who will be listing the property for sale. The purpose of this form is to establish an official agreement between the seller and broker regarding the sale of a residential property. A Texas real estate listing agreement is a contract that outlines the arrangement between a real estate agent and a property seller.