Over the past decade developed states have committed significant public financing for climate change adaptation. Much of this public financing flows through international development organizations. States have delegated the implementation and monitoring of adaptation to existing international organizations such as the World Bank, the United Nations Development Programme, and the Organisation for Economic Co-operation and Development. Scholars have noted that states delegate discretion to specialized organizations to perform a task on their behalf, but have not explored how uncertainties about the nature of the task affect delegation. This article addresses this gap by distinguishing the concept of epistemic ambiguity (when states are uncertain about the exact nature of a task) from strategic ambiguity (when states do not reach consensus over a task due to political differences) in order to address the question: how have states and international organizations defined and implemented adaptation activities?