Advice on how to negotiate realtor's fee

Based on the responses to this thread I started, my wife and I have been working with a real estate agent to get my FIL’s house sellable. Part of that is doing some repairs while my FIL is still living in the house. My wife wants to spends a bunch of money for a new roof and paint, the agent said don’t do that. He said he can price the house at an amount that if the potential buyer wants these things included in the purchase, we can make a minimal deduction in the price and let them take care of those things. Both tend to be items that are high on the personalization list.

Back to the OP’s question, the agent also stated that with the hot market in this area, part of the purchase agreement will include the buyer paying both the buyer’s and seller’s fees. I was surprised by this, when my wife and I bought our house 9 years ago, we negotiated having the seller pay both fees. This likely happened because our offer on the house was $12,500 over the asking price.