update_embassies_effect

update_embassies_effect = {
	if = {
		limit = {
			has_perk = embassies_perk
			is_landless_adventurer = no
		}
		remove_all_character_modifier_instances = embassies_perk_modifier

		set_variable = {
			name = current_embassies_perk_value
			value = 0
		}
		set_variable = {
			name = previous_current_embassies_perk_value
			value = 0
		}

		if = {
			limit = {
				exists = var:previous_current_embassies_perk_value
				exists = var:current_embassies_perk_value
			}

			every_ally = {
				prev = {
					change_variable = {
						name = previous_current_embassies_perk_value
						add = 1
					}
					if = {
						limit = {
							exists = var:current_embassies_perk_value
							var:current_embassies_perk_value < embassies_max
						}
						change_variable = {
							name = current_embassies_perk_value
							add = 1
						}
						add_character_modifier = {
							modifier = embassies_perk_modifier
						}
					}
				}
			}

			# For players that were over the cap before the change so that they don't feel like they've "lost progress"
			save_temporary_scope_as = variable_check
			if = {
				limit = {
					var:current_embassies_perk_value < scope:variable_check.var:previous_current_embassies_perk_value
				}
				set_variable = {
					name = current_embassies_perk_value
					value = var:previous_current_embassies_perk_value
				}
			}
		}
	}
}

As written in game/common/scripted_effects/00_diplomacy_perk_effects.txt.