Erytropus said:
hammer can also be a weapon, not sure if that one should be implied
There was a suggestion in an older forum thread to rename it to hammer_(tool), which probably wouldn't be a bad idea. Less than a third of war_hammer posts are tagged hammer, so it would seem that many taggers regard the latter tag as tool-specific anyway.
I'd still be wary of implying tools, though. Even if you rename the tag and clean out all the images of weapons, you'll still get folks using it for things that clearly are of no use as tools, like post #4507206 and post #5162016. I don't know how to explain the difference between hammers and mallets to ESL users, especially considering that a mallet can be a kind of tool as well.