To use the normal house-building analogy, I would say that the Tools are obviously saws, drills, etc. Things that you use on every house you build but that are not part of the house itself. These represent notepad, visual studio, git, etc.
e: So it's like saying the #1 carpenter's tool is wood.
If it is about Node, then I retract my point.
To examine another simple example, consider a potter who crafts a vase from clay. The potter's wheel and his hands are the tools he uses to form the clay medium. I do not consider the clay itself to be a tool.