Update: The first sample was pulled. It no longer works. Have you checked out the SharePoint 2013 workflow samples from MSDN? I sometimes hesitate to download these because you never know the quality. Some of them don’t even compile without changes. Recently, I found a pair of examples from the Apps for Office and SharePoint Samples that do work with the RTM SharePoint 2013 and latest developer tools, one I had to tweak. SharePoint 2013 workflow: Workflow-powered app for SharePoint
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