In various embodiments, methods, systems, and non-transitory computer-readable media are disclosed that allow users to specify runtime customizations of documents developed using a desktop integration framework. Workbook metadata is a set of information that describes how a given workbook is integrated with a particular web application. When a workbook is being published, metadata may be written into a local cache in the published workbook as well as a workbook definition file. Metadata management may be handed by a metadata service allowing updates and customization of published workbooks independently of a local cache in the published workbook and the workbook definition file. A workbook composer enables users to customize the metadata and store the customizations using the metadata manager.