Agent-oriented patterns have been considered potentially useful for improving communication and comprehension of the concepts they describe and for bridging the gap between conceptual modeling and implementation. A pattern needs to be appropriately described for it to be an effective tool of experience sharing. However, many existing approaches to agent patterns lack features that we consider important to pattern descriptions. In this paper, we present a template that we believe improves on current ways of describing agent patterns. We also describe the BDI agent architectural level pattern using our template.