Essential Permissions Mod Wiki & Guide

It adds permission checks into vanilla Minecraft so servers can fully customize who is allowed to do what. This lets you control access to commands and other actions instead of relying on the default operator system.

Command permissions use Brigadier's node system, where each node has its own permission. For example, minecraft.command.gamemode controls access to the /gamemode command node, while minecraft.command.gamemode.survival is needed to run /gamemode survival.

You need to give access to all of the command's child nodes, such as minecraft.command.gamemode.* for the gamemode command. Granting only the parent node is not enough to run every variant of the command.

The server will make clients think they are OP, even though they may not actually be. This allows players with the appropriate permissions to place operator blocks and access the gamemode switcher menu.