In the past years, the INRIA ATLAS Group has been building an MDA tool bench named AMMA (ATLAS Model Management Architecture). The present discusses the main characteristics and overall vision of this platform in the context of the OMG MDA Tool Capabilities RFI. In the following pages, we will provide an overall description of what MDA tool capabilities means for the ATLAS Group. We will show, within this response, how our overall Model-Driven Engineering (MDE) vision and implemented platform bring answers to the different RFI questions. We will also highlight the various MDA tool-specific needs and requirements we have already identified, even though some are not yet fully addressed by the current version of our platform. In a more organizational point of view, we have tried to follow as much as possible the logical sequence of the RFI proposed questions; however in many cases we have answered several questions at once. Our goal is not to answer exhaustively all the questions but more to cover all the different requirement areas.