public function exists( $args ) {
		global $wp_roles;

		if ( ! in_array( $args[0], array_keys( $wp_roles->roles ), true ) ) {
			WP_CLI::error( "Role with ID '{$args[0]}' does not exist." );
		}

		WP_CLI::success( "Role with ID '{$args[0]}' exists." );
	}