guest_allowed_to_leave_trigger

guest_allowed_to_leave_trigger = {
	NOR = {
		# Not blocked by script
		has_character_flag = blocked_from_leaving
		#Agent in a local scheme
		scope:host = {
			any_courtier = {
				any_targeting_scheme = {
					any_scheme_agent_character = {
						this = scope:guest
					}
				}
			}
		}
		scope:host = {
			any_targeting_scheme = {
				any_scheme_agent_character = {
					this = scope:guest
				}
			}
		}
		any_child = { # No child can be a known child of the host
			is_adult = no
			any_parent = { this = scope:host }
		}
		# Diarchs don't leave their court.
		is_diarch = yes
		is_designated_diarch = yes
		#Would be leaving without spouse or underage child
		any_child_not_in_traveling_family_trigger = yes
		any_consort_not_in_traveling_family_trigger = yes
		#Is waiting for inspiration funding
		exists = inspiration
	}
}

As written in game/common/scripted_triggers/00_courtier_guest_management_triggers.txt.