Tool type: Single
Tool name: Rigging bone
Tool icon: A white bone with orange-ish segment
Tool short description:
Adds bone to the scene you can move, rescale, rotate the bone.
Tool action on Left click:
Places bone to the clicked location
Tool action on Right click:
Rescale the bone
Note: The bones will be exported with the mesh, ready and rigged. It would be good if you add animating tho, but that is another story don't mind it for now

Images for inspiration

