This is effectively an add-on for Vault Hunters 3rd Edition (or modpacks built upon it like Wold's Vaults) and will not function without the main Vault Hunters mod.
This mod adds a config that allows you to blacklist certain commands from being ran while a player is inside a Vault. Operators automatically bypass this restriction.
You can find the config in your config folder, titled "vaultcommandblacklist-common.toml".
By default, blocks several commands from FTB Essentials such as /home, /back, etc. to prevent players from teleporting while inside vaults, but you can add additional commands as you see fit!