Demand Pastureland

is_available = trigger_if = {
	limit = {
		is_ai = yes
	}
	primary_title.tier >= tier_county
	domain_size < domain_limit
}
is_shown = scope:recipient = {
	government_has_flag = government_is_herder
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

scope:actor = {
	is_adult = yes
	is_imprisoned = no
	prestige >= minor_prestige_value
	trigger_if = {
		limit = {
			is_landed = yes
		}
		custom_tooltip = {
			text = mpo_retrieve_land_from_herder_interaction_neighbour_tt
			any_sub_realm_county = {
				any_neighboring_county = {
					holder = scope:recipient
				}
			}
		}
	}
	trigger_else = {
		government_has_flag = government_is_landless_adventurer
		domicile.domicile_location.county.holder ?= scope:recipient
	}
}
scope:recipient = {
	custom_tooltip = {
		text = mpo_retrieve_land_from_herder_independent_tt
		OR = {
			AND = {
				is_independent_ruler = yes
				is_tributary = no
			}
			is_tributary_of_suzerain_or_above = scope:actor
			is_vassal_of = scope:actor
		}
	}
	custom_tooltip = {
		text = mpo_retrieve_land_migration_tt
		capital_county = {
			is_migration_target = no
		}
	}
}

As written in game/common/character_interactions/09_mpo_interactions.txt.

on_accept = scope:recipient = {
	if = {
		limit = {
			is_tributary = yes
			NOT = {
				is_tributary_of = scope:actor
			}
		}
		suzerain = {
			add_opinion = {
				target = scope:actor
				modifier = upset_opinion
				opinion = -25
			}
		}
	}
}
save_scope_value_as = {
	name = revoke_title_interaction
	value = yes
}
scope:recipient = {
	capital_county = {
		change_county_control = -25
	}
}
scope:actor = {
	add_prestige = minor_prestige_loss
	trigger_event = char_interaction.0199
}
scope:actor = {
	if = {
		limit = {
			has_character_flag = flag_hostile_actions_disabled_delay
		}
		remove_character_flag = flag_hostile_actions_disabled_delay
	}
	if = {
		limit = {
			government_has_flag = government_is_landless_adventurer
		}
		demand_pastureland_adventurer_interaction_effect = yes
	}
	else = {
		revoke_title_interaction_effect = yes
	}
	if = {
		limit = {
			scope:hook = yes
		}
		use_hook = scope:recipient
	}
}
on_auto_accept = scope:recipient = {
	trigger_event = char_interaction.0200
}

As written in game/common/character_interactions/09_mpo_interactions.txt.