Abstract: An application development tool can support sampling of data from one or more providers of data that will be queried by the application under development at runtime. The sampling results can be used to provide hints or suggestions at development time so that a developer defining code segments that make reference to data resulting from such queries can produce code segments having the proper context to reference the data of interest. The sampling results can comprise a plurality of parameters and the application development tool can provide a user interface whereby a user can indicate custom type declarations for the returned parameters and/or identify a subset of the parameters returned by a query as being of interest. The custom type declarations and/or identified subset can be used to facilitate more meaningful hinting or suggestion by the application development tool.