Anticheat Mod List

Minecraft does not expose the list of mods a client has installed, so this mod closes that gap. When a player joins, the client must send the list of loaded mods to the server. The server compares that list against the whitelist set by the admin and disconnects the player if anything does not match. Two situations lead to a kick: a mod that is not listed, and a listed mod that is missing. Any mod named in the whitelist is treated as unauthorized if it is not explicitly allowed, even a harmless one.

The whitelist is edited in a file that lists the mod IDs a modpack uses. The mod's own ID must always be included, otherwise the server flags the mod itself as unauthorized. Changes take effect after running the reload command in game or in the console, or after restarting the server. Performance and quality-of-life mods such as Sodium, Lithium, Iris and ModMenu are commonly added to the whitelist alongside gameplay mods, since they do not greatly affect game balance. Each join attempt is logged, which gives admins a record of connection activity. Fabric API is required, and the code is under the GNU General Public License v3.0 only, so the project is open source.