World leaders will have to hammer out the details of how to implement plans to cut greenhouse gases when they meet in Chile next year, the host country said.

Member countries of the Paris climate deal agreed last December at the U.N. Framework Convention on Climate Change in Katowice, Poland, to a rulebook governing how the world will cut emissions. Chile’s Environment Minister Carolina Schmidt said these countries should provide clear wording and terms for implementing the rulebook.

“The rulebook is not operative,” Schmidt said at a Jan. 22 event in Santiago organized by the University of Chile,...