GUI-less App Bundle

Question

I would like to create a helper application that has no GUI yet does have access to an app bundle. I was looking at the Xcode command line project templates, but these all just

Answer 1

I would like to create a helper application that has no GUI yet does have … an app bundle.

That's called an agent, and you make one by making a regular application and setting its LSUIElement key to the string “1”.