For the past two decades, several design support tools have been developed for both research and commercial purposes. Most are stand-alone tools; few are comprehensive or collaborative design environments. Agent technology is an emerging field and agent-based application design is still a pioneering discipline. The agent-oriented design is a new generation method of programming design that mainly uses the script language as a basis for development and that is suitable to design the multi-agent application system. Some tools have adopted the notion of computational agency. In the urban design environment, suppose design objects such as pavements, lamps and plazas can look after themselves and have its own behavioral mechanism, where would a design object acquire the knowledge that allows it to interact intelligently? This paper investigates the question through the notion of objects as agents in design and the purpose of this research is to propose a coordinative mechanism of agents of spatial objects by establishing this design agent.
