Various technologies and techniques are disclosed for generating add-in bridges that allow hosts to be extended using a dynamic language. The system programmatically determines static requirements that an add-in is required to implement in order to integrate with a particular host. The system programmatically generates the add-in bridge to conform to the requirements of the particular host and to operate like a compiled add-in while actually calling dynamic language script files that are executed by a scripting engine. The add-in bridge is generated by generating a component for the add-in that contains at least one class to conform to the host requirements. A constructor is then generated for the class. For each method the add-in is required to implement, a respective method is generated in the class that provides a stub implementation but that calls dynamic-language script files to perform a desired functionality.