Different approaches to improve business process have been proposed. One of the most common techniques is based on software agents and workflow technology. A software agent can be adopted to implement and to manage workflow, and to give to an enterprise new functionalities such as job automation and integration among levels. This paper describes Agent Developer Studio, a tool for modeling and implementing rule-based agents database-oriented. The particular context addressed in this work is the workflow management, and a special focus is kept for agents acting in an environment mainly based on a Relational Database Management System (RDBMS). The system architecture, the underlying model, and the possible fields of applications of such a tool, will be discussed. An example of a particular application will be also presented.