Propose Alliance

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	is_at_war = no
	any_ally = {
		count < 2
	}
}
is_shown = scope:puppet_or_actor ?= {
	has_perk = defensive_negotiations_perk
	is_landless_adventurer = no
	NOR = {
		government_has_flag = government_is_herder
		is_character_interaction_shown = {
			recipient = scope:recipient
			interaction = negotiate_alliance_interaction
		}
	}
}
scope:recipient = {
	NOR = {
		this = scope:puppet_or_actor
		is_allied_to = scope:puppet_or_actor
		target_is_vassal_or_below = scope:puppet_or_actor
		target_is_liege_or_above = scope:puppet_or_actor
		government_has_flag = government_is_herder
	}
	is_ruler = yes
	primary_title.tier > tier_barony
}

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

scope:puppet_or_actor ?= {
	is_landless_adventurer = no
}
scope:recipient = {
	NOT = {
		target_is_vassal_or_below = scope:puppet_or_actor
	}
	NOT = {
		target_is_liege_or_above = scope:puppet_or_actor
	}
}
custom_description = {
	text = already_has_an_alliance_deal
	subject = scope:recipient
	scope:puppet_or_actor = {
		NOT = {
			any_ally = {
				has_opinion_modifier = {
					modifier = perk_negotiated_alliance_opinion
					target = scope:puppet_or_actor
				}
			}
		}
	}
}
scope:recipient = {
	is_playable_character = yes
	is_at_war = no
	is_imprisoned = no
}
scope:puppet_or_actor = {
	is_playable_character = yes
	is_at_war = no
	is_imprisoned = no
}
custom_description = {
	text = has_already_rejected_renegotiation
	subject = scope:recipient
	scope:puppet_or_actor = {
		NOT = {
			has_opinion_modifier = {
				modifier = refused_alliance_opinion
				target = scope:recipient
			}
		}
	}
}
custom_description = {
	text = has_sent_interaction_already
	subject = scope:recipient
	scope:puppet_or_actor = {
		NOT = {
			has_pending_interaction_of_type = perk_alliance_interaction
		}
	}
}

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

on_accept = save_scope_value_as = {
	name = perk_alliance_interaction
	value = yes
}
scope:puppet_or_actor = {
	custom_tooltip = negotiate_alliance_effect_tooltip
	trigger_event = char_interaction.0235
	create_alliance = {
		target = scope:recipient
		allied_through_owner = scope:puppet_or_actor
		allied_through_target = scope:recipient
	}
	stress_and_fulfillment_impact = {
		shy = minor_stress_impact_gain
	}
	if = {
		limit = {
			scope:hook = yes
		}
		use_hook = scope:recipient
	}
	if = {
		limit = {
			scope:influence = yes
		}
		change_influence = major_influence_loss
	}
}
scope:recipient = {
	add_opinion = {
		modifier = perk_negotiated_alliance_opinion
		target = scope:puppet_or_actor
	}
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:puppet_or_actor
	TARGET = scope:recipient
	VALUE = medium_unity_gain
	DESC = clan_unity_alliance.desc
	REVERSE_NON_HOUSE_TARGET = no
}
on_decline = scope:puppet_or_actor = {
	trigger_event = char_interaction.0236
}
scope:puppet_or_actor = {
	add_opinion = {
		modifier = refused_alliance_opinion
		target = scope:recipient
	}
}
add_clan_unity_interaction_effect = {
	CHARACTER = scope:puppet_or_actor
	TARGET = scope:recipient
	VALUE = minor_unity_loss
	DESC = clan_unity_alliance_refusal.desc
	REVERSE_NON_HOUSE_TARGET = no
}
on_auto_accept = scope:recipient = {
	trigger_event = char_interaction.0234
}

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