Hello! I am making rewriting my mod called Transmutation.

I have an item called tStone. I would like this item to have different tooltips in different places. For example, if you mouse over the tStone in the creative menu or NEI, then it should say "Infinite Uses". If you're crafting it, then it should have the crafter's name (looks like "Owner: {playername}"). Is there a way to achieve this?

Of course you can do that. Use IRecipe to add NBT when crafted by player.

  (There is a tutorial for getting player from IRecipe in Tutorial section in this forum)

And in addToolTip add the player name to the tooltip.

Of course you can do that. Use IRecipe to add NBT when crafted by player.

  (There is a tutorial for getting player from IRecipe in Tutorial section in this forum)

And in addToolTip add the player name to the tooltip.

 

Will it show the tooltip when the player has the recipe in place but hasn't "crafted" it yet? (When you mouse over the result but haven't taken it out yet)

Yes it would. (Because the itemstack in crafting slot is a real stack, not ghost or something)