The Model Development Infrastructure (MDI) is a framework that prepares and structures input data for use in a variety of modelling tools. While its datasets can be adapted for multiple platforms, they are specifically organised for smooth integration with the Model User Interface for OSeMOSYS. The files are arranged in a chronological sequence, enabling users to follow a clear step-by-step process when developing a comprehensive Climate, Land, Energy, and Water systems (CLEWs++) model. Please note that to use the MDI tool, the user should download all files and keep them locally stored in one folder. If the files are not kept in the same folder, the internal workbook links will not function.