What's this for?
This is a Visual Studio extension which automatically triggers all T4 templates in your solution (or selected project for project-only builds) to be re-run before build.
The source is available on github, which is also a good place to raise any issues you have with the extension.
If you are looking for a T4MVC specific runner which only runs your T4MVC templates, you'll want to use AutoT4MVC instead (it's way smarter).
By default, the extension will run all of your T4 templates on build. If that's what you want, great -- zero configuration required.
If you want to customize the behaviour, you have two options: