Managing the loading of third-party tools on a website is described. Configuration is received for loading the third-party tools. An intermediary server receives a request for a page that is hosted at an origin server. The intermediary server retrieves the page and modifies the page including automatically including a third-party tool manager to the retrieved page. The third-party tool manager includes a set of one or more client-side scripts that, when executed by the client network application, collects, and transmits information to the intermediary server for loading the third-party tools. The intermediary server loads the third-party tools based on the received information and the configuration. The intermediary server causes event data to be transmitted to third-party tool servers that correspond with the third-party tools.