Agency Duties of a Listing Agent
The listing contract will specify that your agent is acting as a "seller’s agent." This means that, in the sale of your house, they are working for you and only you. However, there may be times when your listing agent has a client who wants to buy your home. For that reason, there is a little "wiggle room" in the listing contract. If your agent also represents the buyer, the listing contract should specify that they provide an additional disclosure that details their duties as a dual agent.
The contract also provides permission for your listing agent to act as an agent for others on other transactions. They can continue to list other properties, and represent buyers looking at other homes.