As grid computing becomes a de facto standard for hosting calcul-intensive applications, current grid middleware technologies do not deal with interactive (i.e. non-batch) applications. From a Telco (or any service-provider) perspective, such class of applications is highly sensitive. We propose a grid service platform that dynamically provisions resources for both interactive and batch applications to meet their QoS constraints while ensuring good resource mutualization. Moreover, we believe that relying on an agent-based approach for resource management will allow a more flexible, robust and scalable solution.