You Shall Not Climb!
"You Shall Not Climb!" (YSNC) is a Fabric server-side mod that takes away an ability to climb ladders from mobs that are not supposed to have it.
MC-148545 "Mobs can climb ladders" was labeled by Mojang as "Works As Intended".
Obviously, this doesn't make any sense since it's expected that most of the mobs don't use ladders deliberately.
It feels more like a side effect that is actually easy to fix, which is what this mod does.
FAQ
What mobs can't climb ladders now?
List of mobs that can't climb ladders: Allay, Armadillo, Axolotl, Bat, Bee, Blaze, Breeze, Camel, Cat, Chicken, Cod, Cow, Creeper, Dolphin, Donkey, Elder Guardian, Ender Dragon, Endermite, Fox, Frog, Ghast, Goat, Glow squid, Guardian, Hoglin, Horse, Llama, Magma Cube, Mooshroom, Mule, Ocelot, Panda, Parrot, Phantom, Pig, Polar Bear, Pufferfish, Rabbit, Ravager, Salmon, Sheep, Skeleton Horse, Shulker, Silverfish, Slime, Sniffer, Snow Golem, Squid, Strider, Tadpole, Trader Llama, Tropical Fish, Turtle, Vex, Wither, Wolf, Zoglin.
Do I need to install it on client?
No, it's only required to a server.
Is this mod compatible with X mod?
Maybe. YNSC provides "ynsc:cant_climb_ladders" entity type tag for compatibility with other mods.
If your favorite mod has some mobs that are not supposed to climb ladders - ask the devs to add support.
Backports?
No plans.
Credits
- SyberiaK - mod author
- DeDiamondPro - came up with a great mod name that many people like:
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as ysnc-fabric-1.21-1.0.0.jar — drop this file into the mods folder
- Download size: 27 KB
- Download link checked 31 Aug 2026 — working
These come from our own check of the pack file, not from the source page.