FOSS gamedev and creative worlds

I know how to add new node types,

but i am wondering now, how to mod new items ?

I want to add a Minetoon Dollar item to the game, but cant find a how to in the documentation...

https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt#L800
https://github.com/celeron55/minetest/blob/master/doc/lua_api.txt#L1297
If you want stackable items then use register_craftitem().

solved that already.

Now i want to access the player inventary when he punches some node.

i can get his inventary using on_punch(pos, node, puncher) then making local playerinv = puncher:get_inventary.

But while everything in a chest is placed at the "main" list, this doesnt look correct for the player inventary...