Some abilities, spells, etc. are optionally automatically used, removing the need to micromanage them in most circumstances though may still be used manually for greater control.
Alternate name: Auto-use
The first video game about Auto-cast was released in 1998.
Commonly usable with single-target damage abilities so they'll be used on whatever the character is attacking. Area affecting things often do not have the option of auto-casting unless it's a friendly buff, heal, or such.
More advanced auto-casting cases allow player to set conditions for it, but that is not requirement for this tag.