According to the Scrum Guide 1 , the definition of "Done" is a formal description of the state of the Increment when it meets the quality measures required for the product. The definition guides the Development Team in creating a "Done" Increment. The definition of "Done" is created by the development organization (or Development Team if none is available from the development organization). The definition of "Done" may vary significantly per Scrum Team, depending on the context. One aspect of Scrum Teams inspecting how they work toward their Product Goal is that they improve their definition of "Done" over time.
Therefore, two things that are appropriate for a Scrum Master to do if the Development Team doesn't have the engineering tools and infrastructure to completely finish each selected Product Backlog item are:
* Coach the Development Team to improve its skills, tools, and infrastructure over time and adjust the Definition of "Done" accordingly.
* Have the Development Team establish a Definition of "Done" that is actually possible to achieve given current circumstances.