To answer my own question "does the tools package need adding to the hardware pack". The answer is no, because the tools package willl be added to the linux-image package as a Suggests package and so will be picked up automatically by hwpack-create and the image tools.
To answer my own question "does the tools package need adding to the hardware pack". The answer is no, because the tools package willl be added to the linux-image package as a Suggests package and so will be picked up automatically by hwpack-create and the image tools.