In this paper, an agent framework, which provides a build in support for dynamic semantic service discovery and invocation within the agent's plan(s), is introduced. To provide such a support, a generic plan structure is defined for semantic service integration. Developer can reuse this generic plan and add it to any agent plan as a task to create semantic service enabled plan(s). The platform executes this kind of plan(s) with its build in support. Also, a case study is developed to show the effectiveness of this approach in terms of integrating agents with web services.