Like most telecommunication companies and service providers, France Telecom deals with highly heterogeneous applications, ranging from batch oriented to rich interactive multimedia services. Deploying those applications on an utility/grid infrastructure is a promising way to cut operational costs while improving performance (load limitations, QoS, etc.). However, most grid middleware technologies do not deal with interactive (i.e. non-batch) applications. Thus, 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 allows a more flexible, robust and scalable solution.