A nice, short statement of the way a GM can interact with the players' requests for action:http://www.bastionland.com/2017/01/a-procedure-for-play.html
This has a fair deal of overlap with Vincent Baker's "MC Moves", both in style and content. (MC Moves are more general-purpose, and contain a lot of techniques this one does not, but this procedure organizes them in order of importance, and can function as a checklist or flowchart, and has the advantage of simplicity, as well.)
What's your "procedure for play", when you play in a certain style? Is it better expressed as a list of "moves" or as flowchart?