The listCommands command lists all available commands, and for "special things" it returns a dedicate field for it.
These special things include adminOnly and slaveOk.

A command returning a cursor should be considered as a special behaviour and be marked so.

		"aggregate" : {
			"help" : "{ pipeline : [ { <data-pipe-op>: {...}}, ... ] }",
			"lockType" : 0,
			"slaveOk" : false,
			"adminOnly" : false,
			"slaveOverrideOk" : true
		},

I'd like to have a "top level field" there called cursor: true/false to clearly differentiate this command from others as it has very specific capabilities.