That written agreement is your buyer's agency agreement, and it sets out how your agent gets paid on your specific purchase, whether entirely from the seller's proceeds, split with a direct payment from you, or some other arrangement the two of you negotiate before you start touring homes.
Because the Saskatchewan Real Estate Commission requires commission to be agreed in writing rather than published as a standard rate, two buyers working with two different agents in the same city can have two different fee structures, and neither one is the wrong answer as long as it was disclosed up front.
Ask your agent to walk through exactly how their compensation works on your purchase before you sign anything, not after an offer is already in on a home near the Saskatoon benchmark of $444,700. Get your hand-reviewed valuation from Joel Dyck.