Software agents roaming around and accessing services is an important part of the vision of the Semantic Web. The need to engage in diverse activities in rapidly changing environments makes it essential that these agents are able to adapt to varying situations. We propose a novel approach to engineer adaptive software agents for such scenarios. Our agents have the ability to exchange their capabilities with peers, support multiple forms of adaptation, enable software reuse through a component-based infrastructure and provide fine-grained and efficient agent mobility. We describe our solution, the first implementation and identify further research issues.