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AttributeFix-Sync

Syncs AttributeFix limits from server to client.

NeoForge
Loaders
NeoForge
Downloads on Modrinth
1K
Followers on Modrinth
2
version
1
Updated
February 2, 2026Feb 2
Published
in 2026

At a glance

Runs on NeoForge
For Minecraft 1.21.1
Needed in the game and on the server
Latest version — 0.0.2 from February 2, 2026
License MIT — free
Where it's needed
In gamerequiredOn serverrequired

Needed both in the game and on the server

Game versions1.21.1

AttributeFix Sync

License NeoForge

AttributeFix Sync is an unofficial addon for the AttributeFix mod, designed to solve the synchronization issue where modified attribute limits on the server are not reflected on the client.

The Problem

In the original AttributeFix, if you modify the upper limit of an attribute (e.g., generic.max_health or generic.attack_damage) in the server configuration:

  1. The Server correctly calculates damage and health based on your config (e.g., capped at 5000).
  2. The Client still uses the default limit (e.g., 1,000,000).
  3. Result: Mods like Jade, WTHIT, or the vanilla health bar display incorrect values because the client isn't aware of the stricter limit enforced by the server.

Features

This mod solves the above problem via packet synchronization:

  • Automatic Synchronization: When a player joins the server, the mod automatically sends all attribute limits (Max Values) configured on the server to the client.
  • In-Memory Patching: Upon receiving the data, the client dynamically modifies the attribute definitions in memory via Mixin.
  • Correct Visualization: Jade, WTHIT, and vanilla bars will now correctly display values based on the actual server limits.
  • Pollution-Free: When the player disconnects, the mod automatically restores the client's attribute limits to their original state, ensuring single-player worlds or other servers are not affected.

Installation & Usage

Dependencies

Usage

  1. Server: Required. No configuration needed. It automatically reads the final values from AttributeFix and sends them to players.
  2. Client: Required. Necessary to receive the synchronization packets.

Configuration

The client configuration file can be found at config/attributefixsync-client.toml.

OptionDefaultDescription
enableSynctrueWhether to accept attribute limit synchronization from the server.
showSyncMessagestrueWhether to show a chat message when attributes are synchronized.

Note: To change the actual attribute limits (e.g., max health), please edit the AttributeFix config files located in config/attributefix/.

License & Credits

This project is licensed under the MIT License.

  • Core logic is based on the Minecraft NeoForge API.
  • Special thanks to Darkhax for developing the original AttributeFix mod. This mod exists solely as a supplementary tool for it.

This is not an official work by Darkhax. If you have issues related to synchronization, please report them to this repository, not the original author.

FAQ

How to install AttributeFix-Sync?

Install NeoForge for your Minecraft version, download AttributeFix-Sync for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does AttributeFix-Sync support?

AttributeFix-Sync has builds for Minecraft 1.21.1.

Is AttributeFix-Sync needed on the server?

Needed in the game and on the server

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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