Rich client search experience

Computer-readable media, systems, and methods for enabling a rich client search experience. In embodiments, a description is received from a data store. The description includes fields of information existing on the data store that are capable of being searched. A user interface is built based on the description and the user interface provides a user with a mechanism for searching the data store. And the user interface is presented to the user. The description is definable by the data store using a data-driven extension, allowing the data store to express schema and query capability information to a client and allowing the client to dynamically customize the user interface based upon the schema and query capability information expressed by the data store.