How to use Sandbox base?

With gmod13 how do we refrence sandbox instead of base? I have done “base” “sandbox” in the .txt file but it doesn’t take it as gmod_tool still doesn’t work.

Also are silkicons part of sandbox?

Would it be best to use sandbox or use base and take over tools/silkicons i need from sandbox? I plopped the gmod_tool ent in my game mode folder and it runs but then you get a shiz load of errors with it trying to add it to the tool menu.

Silk icons aren’t game mode specific and you need to call DeriveGamemode(“sandbox”) in shared.