I have a hotkey that fires drafts://capture so I can globally start a capture without drafts being open.
When I either cancel or save the capture, I’d like to have an option to make it either quit the app, defocus itself, or potentially allow any action to be run automatically. Otherwise anytime I do a quick capture I need to do an extra click to de-focus drafts.
There’s not really a meaningful way to do what you ask. A URL will always bring the target app to the front, before it even hands it the URL and it can’t really know if it was already active or not.
Is there a compelling reason not to leave Drafts running? It’s a lot more efficient to run that way and not force your computer to do all the extra work of launching processes everytime you use it, and to allow background processes like sync to stay up-to-date. With it running, you could just be using the global hot key for the capture window, which floats over other apps and does not bring Drafts to the front.
Didn’t know setting the hotkey in Drafts itself doesn’t focus the app, will do that instead 
. Also seems like it’s a little less janky doing it like that (running the Deeplink version disables the traffic lights on the capture window).
I can leave Drafts running all the time, but I kinda liked having a global hotkey that works even when Drafts happens to not be running. Though if I care enough I could over-engineer a keyboard maestro script to work around that.