1) Player has 2 tools and rolls dice total of 6 for wood. 6 = 2 wood. 6 + 2 < 9. Player has no meople remaining for production.
2) this same player who is rolling dice for wood (as above example) does NOT use the tools IF player also has food gathering meoples remaining to roll.
To my opinion a player who does both 1 and 2 above proves that they do understand not to waste 2 tools for 0 wood...and also proves that they waste game time for no purpose.
If this is the biggest worry for my day, then I am a happy person, but players who do this time waste are bothersome