Does using a non-tradable tool on an item make it also non-tradable in Dota 2?
Solution 1:
No it doesn't, I've used a non tradable tool to create a gem socket on a courier and the courier is still tradable. However using a non tradable item in a crafting receipe will craft a non tradable item.
For any action that result in creating a non tradable item, you are promted a warning and a confirmation.