Forge instruments are used to run a coalforge. A how to make you can find here.
I use four tools to run my forge:
Slider
The slider is used to move and organize the burning coal in the forge.
Shovel
The shovel is mainly used to feed the forge.
Ladle
I use two different sizes of ladles. A bigger one for water to coolen down the workpiece or the coal.
And one smaller one to handle supporting materials like borax or carbon.