A project system is automatically configured from project capabilities determined from an instance of a build system by a project capabilities analyzer. A flexible configuration based build system defines the consuming project system. Results of an evaluated project file are used to define the overall capabilities of the build system. The capabilities are used to dynamically load and assemble the project system code. Changes in the project capabilities due to a reevaluation of a result of a build can then redefine and reassemble the project system code. Hence project system configuration is data-driven rather than user-defined and utilizes a flexible, configuration based build system to define the consuming project system.