It will substitute for the screwdriver, but not for the hammer.
Pretty sure this is a trivial JSON edit to fix 
Not sure if the toolset includes a hammer.
It does, as per description and functionality when crafting.
Looking into this.
JSON fix.
Merged Soyweiser’s.
I also was. Actually 
it was a trivial json fix, but not to add the hammer, where exactly is there going to be a hammer in a bionic built into your hand/arm?
That’s probably the second easiest of the tools to fit in. Just add a disc of steel to the edge of the hand and you can swing your forearm as the hammer shaft.
Now how the hacksaw works I don’t know. I’m guessing it’s actually a tiny powered cutting device.
Also the welder. You do not want your hand right next to a welding arc.
In other words, you could get the same effect by taping a quarter to your hand. How about you try that and report back how well it works.
Well, if the quarter had a bunch of structural reinforcing fusing it to my ulna.