Addons

Addons for Slimefun Legacy

Slimefun has a large addon ecosystem. Slimefun Legacy aims to preserve the established Slimefun 4 addon API and saved data wherever practical, but no core fork can guarantee every historical addon build.

Before installing an addon

Check all of the following:

• the addon is intended for Slimefun 4 or a compatible API;
• required library plugins are installed;
• the addon supports your Minecraft/Paper version;
• the addon does not require a different Slimefun core implementation;
• the addon is actively maintained or has been tested on your staging server.

Use /sf versions, /sf doctor compatibility, and /sf doctor dependencies to inspect the installed stack.

Legacy-maintained and tested addons

See Addon Ecosystem for the current Legacy-oriented addon guidance and Compatibility & Addons for compatibility expectations.

Existing worlds

When replacing an addon build, back up first and verify item IDs, block data and machine behavior on a staging copy. Do not assume that similarly named forks use identical persistent data.

Addon developers

See the Developer Guide for API and compatibility guidance.