A system for modifying an existing standard-based system at runtime can include a computer having an annotation framework layer configured to execute in conjunction with the standard-based system. Responsive to a user request, the annotation framework layer can associate a constraint with a selected message type. The constraint can specify a limitation on information that is requested within a service request type of message. The annotation framework layer can intercept a message exchanged between a client and a Web-based service and apply the constraint. When the intercepted message is a service request type of message, at least one parameter of the intercepted message can be modified to conform with the limitation after the service request is sent from the client and prior to the service request being received by the Web-based service. The message can be stored.