If you're buying a house using cash and using the seller's agent, there are a few things you should be aware of and take into consideration to protect your own interests:

Dual agency: The seller's agent represents the seller in the transaction, so if you use the same agent, it creates a dual agency situation. This means the agent will be representing both the buyer and the seller, and as a result, the agent has a fiduciary duty to both parties, which could compromise their ability to fully represent you. It is important that you understand and accept the terms of dual agency and how it impacts the agency relationship.

Confidentiality: The seller's agent will have access to a lot of information about the seller's motivations, the condition of the house, and other details that could be valuable to you as a buyer. However, as the agent represents the seller, the agent may not be able to disclose all this information to you.

Negotiations: The agent will be trying to get the best price for the seller, which may not always align with your best interests as the buyer. It may be hard for the agent to advocate for you as a buyer and negotiate the best deal for you in this situation.

It's a good idea to have an attorney review the sales contract, and to do your own inspections and due diligence to ensure you understand the condition of the property and any potential issues with it.

Overall, it's important to be aware of these potential conflicts of interest and to work closely with an attorney and other professionals, such as a home inspector, to protect your interests.