Over the past few years, agent concepts have been introduced as an option to increase the network lifetime reducing the data dissemination over the network and to provide application reprogramming functionalities in wireless sensor networks (WSN). However, one important problem is the presented results of energy consumption do not reveal the practical energy consumption, because usually the setting parameters does not correspond the sensor nodes characteristics, or they ignore at least one of the three main domains: radio communication, sensing or data processing. In this paper we propose a reflex-Agent model with coordination without communication for a WSN using target tracking as the motivational application. The goal is to exercise this model to assess potential benefits of using agent concepts in wireless sensor networks applications