Eclipse is widely used as an integrated development environment (IDE) for many projects that leverage mainstream programming languages such as Java and Python. However, its usage for Veterans Health Information Systems and Technology Architecture (VistA) development has been limited. This document describes the work performed by the Open Source Electronic Health Record (EHR) Services Project Team, on behalf of the Department of Veterans Affairs (VA), on an IDE for VistA development that is built on the Eclipse platform. This work builds on the existing VA-developed MTools and adds support for hierarchical directory structures, a rewrite of client portion of the MDebugger to follow general Eclipse guidelines with additional features such as: code tracing; an alternative debugger based on debug commands that are provided by MUMPS implementations; a number of analysis and refactoring tools; and various fixes.