Tent is an item that is found in Kingdom Hearts and Kingdom Hearts II. In Kingdom Hearts, it restores all of the party's HP and can only be used from the menu. In Kingdom Hearts II, it fully restores the party's HP and MP, and just as in the previous game, it cannot be used in combat, only from the menu.
In Kingdom Hearts II, it costs 100 munny and it can be sold for 25 munny. It can be bought in any Moogle shops, Wantz's Item Shop in Twilight Town, and Huey, Dewey, and Louie's Item Shop in Hollow Bastion or Radiant Garden.