Q : what is the purpose of this mod?
A : This mod's purpose is to make vanilla team system to more enhanced
Q : what this mod do when installed?
A : Let’s take Evoker for example, who summons Vexes as minions. If you put evoker in the 'Red' team with the /team command, normally summoned vexes don’t have any team. In order to put them in the same team as the summoner, you need to use the /team command again. But with this mod, there’s no need for that. Summoned mobs will automatically join to same team as their summoner.