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The AgentContest 2009 provided a revised Cows and Herders scenario which extended the last year's setting. First, additional environment objects, i.e., fences and switches, were introduced. Secondly, the team score is calculated by the net amount of herded cows at the game end. In this paper we present the design of the multi-agent system (MAS) prototype which participated in this contest and has been developed under usage of the Jadex multi-agent platform. The main focus of our second-time participation was to switch from the centralized coordination architecture of our previous MAS to a decentralized coordination in order to increase the single agents' autonomy. To facilitate the development parts of the Tropos methodology were utilized. These have been extended by platform specific features (e.g. the modularization concept). During the development we were able to identify and eliminate key problems and as a result our prototype could achieve the second place in the contest. [ABSTRACT FROM AUTHOR]