I think the most important skill for a real estate agent is the ability to listen. Real estate agents need to be able to listen closely to what their clients want, and adapt their services accordingly. They also need to be able to listen closely and respond appropriately when they're with their clients—for example, if they say something like "I know exactly what I want," an agent should not try to dissuade them by saying things like "But how do you know? You might not be able to afford it!" Instead, they should help the client explore all of their options in an open-minded way.
The ability to listen is also crucial when working with other agents, as well as with other professionals like lawyers and inspectors. This skill will help you build relationships with your colleagues and make sure that everyone involved has the best chance at getting what they want out of selling or buying a home.