Tags for DAG are created automatically. But is there a way to create meaningful description for the tag? So user can not only use tags for searching but see description of tags that are used.
Tag is just a string, it's not an entity of its own in Airflow. In Airflow database you only have dag_tag <dag_id, name> where you associate DAG with a tag. So no way to add description or any other metadata to the tag.