Ios Shortcuts

Just discovered this tool in ios for automating various actions linking different apps and actions together through a workflow. Omnifocus is advertised there by dedicated shortcuts you can reuse.

I have no idea how these work or how you put them together. I assume at some level it requires the devs to open up something to Apple to provide access to script able services inside the app? Is there anything that is doable by default i.e. As the app is today?