The TFS Code Review tools in Visual Studio 2012 and later are used to get reviews from peers within TFS projects. Use with the [tfs] tag
Microsoft page on the code review feature
For the first time, Visual Studio 2012 includes a Code Review process out of the box by leveraging the Team Foundation Server Work Item Tracking system along with the use of shelvesets. All the information is easily accessible through the redesigned Team Explorer window and Team Foundation Server Web Access. This allows code reviewers to compare code files, annotate them, and send comments back to the requester.