Simple extension to keep track of the tags added last to a workitem and surfacing them in an easy to use MRU context menu. You can see how it was built at https://cschleiden.wordpress.com/2016/02/24/vsts-tags-mru-extension-part-1/. It's also available in the marktplace at https://marketplace.visualstudio.com/items?itemName=cschleiden.tags-mru
Based on https://github.com/cschleiden/vsts-extension-ts-seed-simple