FairPlayGuardian is a Vintage Story mod by Th3Dilli. FairPlayGuardian lets Vintage Story server admins control client-only mods, verify their SHA256 integrity, and detect Harmony patches.
Why this mod is worth installing
It is intended for server owners who need stronger client-side mod checks than the built-in mod blacklist or whitelist provides. It helps maintain a more controlled multiplayer environment, although it cannot detect every possible cheat.
What FairPlayGuardian adds
FairPlayGuardian expands server-side control over mods that run only on a player's client. Administrators can define which client mods are allowed or blocked instead of relying solely on the game's automatic handling of mod lists.
The mod can check a mod's SHA256 hash, making it possible to distinguish an approved file from a modified copy. It also looks for Harmony patches, which can reveal client-side alterations that are not obvious from the installed mod list.
This is a server administration and integrity-checking tool rather than a gameplay content mod. It is useful when a server needs individual client-mod rules or additional verification, while still requiring realistic expectations about cheat detection.
Where to download FairPlayGuardian
The official Vintage Story Mod DB page is the right place to get the current release through the in-game mod manager.