Organizers: Mr. Steve Reinhardt (D-Wave Systems) and Dr. John Cortese (MIT Lincoln Laboratory) Early quantum computers are becoming available to application developers, raising a host of questions about how to use them gainfully and even productively.  What are the best abstractions that capture the essence of the quantum computer instruction set and yet offer some stability over architectural changes and hardware generations?  What are the key performance metrics, and how will users want to trade off among those metrics?  How much detail about the quantum computer can we expect early users to have?  For likely abstractions, what difficult transformations need to be performed by tools?  For which of these questions do we have good understanding, such that we can develop tools with confidence, and for which do we not? In this focus area on quantum-computing tools, we seek submissions that address these questions, targeting languages and other interfaces, user experience with early implementations, abstractions and intermediate representations, and methods implemented by such tools. This call is open to both tools that are specific to a given problem type or general for many application types. We encourage submissions describing how software tools interact with real hardware, as opposed to theoretical papers at the STOCS/FOCS level.