A Managed Add-in Framework (MAF) proxy generation tool comprises a library analyzer module operable for taking as input either a type library or managed software code assembly of the existing host application, and a proxy code generation module. Also, an additional input XML file that describes changes that a user would like to be made may be received by the tool and data acquired form the inspection of the additional input XML file and the inspection of the other inputs is merged and used to create the code of the proxy to the host object model. The proxy to the host's object model conforms to requirements of the MAF.