Removing the basic tools from Artisan Integrations seems to cause the game to crash. I had removed Terrasteel tools as I had no plan to have them used, but when I did so, Artisan Workstations crashed on pre-initialization. The exact error report can be found here: https://pastebin.com/z3GgwWtM

I've not tried removing manasteel or elementium, but I am assuming that those would likely cause a similar crash. Might be something to test when looking at fixing it just to be sure.

Can you please link the tool material json file that caused this?

The error suggests that there may be a stray comma in the list of materials.

For example the last comma:

{
  "list": [
    {
      ...
    },
    {
      ...
    },
  ]
}