Current IT applications are often meant to be used in complex and highly dynamic environments. Multi-Agent Oriented technologies and related programming languages offer high level abstractions that can ease the realisation of such applications. However, providing the means to handle adaptation and endogenous reorganisation, is still a challenging issue even if multiple state-of-the art works propose reorganisation models at the agent level. Adopting a multi-agent oriented approach, in this paper we define a dedicated artifact (tool) that agents use to design and implement transitions to new organisations. The agents' compliance with a specific organisation specification that we formulate helps regulate and coordinate this reorganisation process. We show how this proposal has been realised within the JaCaMo multi-agent oriented programming platform and how this constitutes a step toward really adaptive systems.