We develop a tool akin to the revelation principle for dynamic mechanism-selection games in which the designer can only commit to short-term mechanisms. We identify a canonical class of mechanisms, dubbed direct Blackwell mechanisms, rich enough to replicate the outcomes of any equilibrium in a mechanism-selection game between an uninformed designer and a privately informed agent. A cornerstone of our methodology is the idea that a mechanism should encode not only the rules that determine the allocation, but also the information the designer obtains from the interaction with the agent. Therefore, how much the designer learns, which is the key tension in design with limited commitment, becomesan explicit part of the design. Our result simplifies the search for the designer-optimaloutcome by reducing the agent’s behavior to a series of participation, truthtelling, and Bayes’ plausibility constraints the mechanisms must satisfy. We illustrate the result via novel applications to dynamic pricing of durable goods, infinite horizon bargaining, and product personalization under the threat of future price discrimination.