I agree with the other agents. Usually these fees come out of my own pocket, not my client's. Though there are certainly many models for different agencies out there. I think it is a little unusual to spring this on you in an addendum without talking about it when you were first talking about working together.
But, as I said, there are many different models out there.
I think the essence of your question has to do with being asked to pay costs outside the terms of your agreement. In terms of the fees themselves, it sounds like the agent is trying to recoup costs associated with transaction coordination and errors and omissions insurance.
It's not unusual for agents to pursue coverage of these kinds of costs. Agents do bare costs in order to conduct business, but these things must be negotiated up front and included in any agreement you make. If they were not, then I don't see how you could be held liable to them. What's more, I wonder what your impression is of the agent after he/she sprung this upon you? That's the part that seems irregular to me!
Why didn't they explore this with you before you made an agreement? I hope you'll let the agent know how you feel about it.
Urban Bay Properties
These are not normal fees. Some companies have started charging transaction fees to help offset the costs of their Transaction Coordinators, but I feel they are not needed and should not be paid by the Buyers. Risk Management Policy is a new one to me and I have been in the business for 19 years. I suppose that refers to Errors & Omissions Insurance which we all pay and asking you to pay a share of it is not the way to go in my opinion. When you say your "original signed agreement" were you referring to a Buyer's Agent Agreement? I do not use them so I cannot assist you there. If you were referring to a Purchase Contract, those two items are definitely not in the Contract. Since you do not want to pay, I would just say no thanks.