YetAnotherConfigLib (YACL)

YetAnotherConfigLib (YACL): Config Screens Without the Boilerplate

YACL is a builder-based configuration library that many client mods rely on for their settings screens, and with nearly 99 million downloads it's one of the most widely used libraries in the Fabric ecosystem. It is primarily a client-side library — the menus it powers are almost entirely about client settings like rendering options and keybinds.

Whether YACL still belongs on your server depends on the specific mods requiring it — a few server-relevant mods use YACL for their own config values too. When in doubt, check the dependency list before leaving it out of the mods folder.

Tip: If a mod declares YACL as a dependency and it's missing, the log will flag it right away on startup — just add the same version you already ship to clients.

Plan the rollout and operation

YACL is a client library and should be versioned together with the mods whose settings pages it provides. After an update, open each affected menu, change one harmless value, and verify that it persists after restart. If a menu is missing, inspect the client dependency message first. A YACL file in the server directory does not replace a missing client dependency or make settings server-wide automatically.

For a clean rollout, create a separate client profile and record the Minecraft, loader, and mod versions. Start without other optional mods, join the server, and check menus, the resource pack, dimension travel, and the actual feature. Add rendering, interface, and convenience mods back one at a time afterward. Publish the tested combination as a recommendation, not a server promise, because hardware and local settings differ. After an update, compare logs and behaviour with a fresh profile before reusing old configuration files. Keep the mod out of the server directory while its project page explicitly classifies it as client-side. On failure, the world remains untouched: the affected player disables the local file or returns to the documented version. For support, request a screenshot of the active profile instance, latest.log, and a list of other graphics mods; these show whether the loader, driver, or an overlap is responsible instead of the server.