get_highest_player_skill_effect

get_highest_player_skill_effect = {
	save_scope_value_as = {
		name = highest_player_skill
		value = flag:diplomacy
	}
	save_scope_value_as = {
		name = highest_player_skill_value
		value = diplomacy
	}
	if = {
		limit = { martial > scope:highest_player_skill_value }
		save_scope_value_as = {
			name = highest_player_skill
			value = flag:martial
		}
		save_scope_value_as = {
			name = highest_player_skill_value
			value = martial
		}
	}
	if = {
		limit = { stewardship > scope:highest_player_skill_value }
		save_scope_value_as = {
			name = highest_player_skill
			value = flag:stewardship
		}
		save_scope_value_as = {
			name = highest_player_skill_value
			value = stewardship
		}
	}
	if = {
		limit = { intrigue > scope:highest_player_skill_value }
		save_scope_value_as = {
			name = highest_player_skill
			value = flag:intrigue
		}
		save_scope_value_as = {
			name = highest_player_skill_value
			value = intrigue
		}
	}
	if = {
		limit = { learning > scope:highest_player_skill_value }
		save_scope_value_as = {
			name = highest_player_skill
			value = flag:learning
		}
		save_scope_value_as = {
			name = highest_player_skill_value
			value = learning
		}
	}
}

As written in game/common/scripted_effects/03_dlc_fp2_scripted_effects.txt.