I thought you clearly stated that tools are value-free, but the choice of tools is not. Eric argued that tools have implicit values as well. I am now confused. I for one accept tat a common sense realist object like a rock may not have implicit human values, but any abstract method of reasoning, or tool associated with man, has some connection to values I would think. Sliding steeply down the path of environmental ethics and philosophy here.
Tools are, in a sense, choices.
I suspect you won't like this. I don't believe we can. The tools don't purge the values. They make us what we are.