Stop Vassal War

is_shown = scope:recipient != scope:actor
scope:recipient = {
	liege ?= scope:actor
	highest_held_title_tier > tier_barony
	any_character_war = {
		primary_attacker ?= scope:recipient
		save_temporary_scope_as = target_war
	}
}
scope:actor = {
	NOT = {
		is_participant_in_war = scope:target_war
	}
}

As written in game/common/character_interactions/00_vassal_interactions.txt.

custom_description = {
	text = cannot_stop_war_when_already_fighting
	object = scope:recipient
	scope:recipient = {
		NOT = {
			any_war_enemy = {
				this = scope:actor
			}
		}
	}
}
custom_description = {
	text = cannot_stop_war_timer
	object = scope:recipient
	NOT = {
		scope:recipient = {
			has_opinion_modifier = {
				target = scope:actor
				modifier = attempt_to_force_end_war_opinion
			}
		}
	}
}
NOT = {
	scope:recipient = {
		has_strong_hook = scope:actor
	}
}

As written in game/common/character_interactions/00_vassal_interactions.txt.

on_accept = scope:recipient = {
	add_opinion = {
		modifier = attempt_to_force_end_war_opinion
		target = scope:actor
	}
}
hidden_effect = {
	scope:recipient = {
		trigger_event = vassal_interaction.0001
	}
}
show_as_tooltip = {
	scope:target ?= {
		end_war = white_peace
	}
}
show_as_tooltip = {
	if = {
		limit = {
			exists = scope:recipient.house
			exists = scope:actor.house
			scope:recipient.house != scope:actor.house
		}
		add_clan_unity_interaction_effect = {
			CHARACTER = scope:actor
			TARGET = scope:target.primary_defender
			VALUE = medium_unity_gain
			DESC = clan_unity_aided_in_war.desc
			REVERSE_NON_HOUSE_TARGET = no
		}
	}
	else_if = {
		limit = {
			exists = scope:actor.house
			exists = scope:target.primary_defender.house
			scope:target.primary_defender.house != scope:actor.house
		}
		add_clan_unity_interaction_effect = {
			CHARACTER = scope:actor
			TARGET = scope:recipient
			VALUE = medium_unity_loss
			DESC = clan_unity_stopped_vassal_war.desc
			REVERSE_NON_HOUSE_TARGET = no
		}
	}
}
on_decline = show_as_tooltip = {
	scope:recipient = {
		add_opinion = {
			modifier = attempt_to_force_end_war_opinion
			target = scope:actor
		}
	}
	scope:actor = {
		add_prestige = minor_prestige_loss
	}
}

As written in game/common/character_interactions/00_vassal_interactions.txt.