KJ's Progression Limiter
Command-based tool progression locks designed for use in Puffish's Skill Tree mods
About this Mod
Adds a /tools command to lock and unlock both vanilla and modded tools
Developed for use with Pufferfish Skill Trees to add an easy way to implement restricted tools on fabric.
Do not use as a standalone mod, there is no built in progression.
To modify the initial tool blacklist, you must edit the util.InitialToolBlacklist.java file
Available Versions
How to Install KJ's Progression Limiter on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.6).
Install Mod
Open the mod browser in the dashboard and search for "KJ's Progression Limiter". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.6, 1.21.5, 1.21.4 (+3 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
KJ's Progression Limiter server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.6). You can switch loaders with one click in the panel.
Is KJ's Progression Limiter compatible with fabric?
KJ's Progression Limiter officially supports fabric for Minecraft 1.21.6, 1.21.5, 1.21.4. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with KJ's Progression Limiter – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if KJ's Progression Limiter consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install KJ's Progression Limiter with just one click on your server.