zstdnet-minekuai

Evidence

Ran on Kiln's test stand (2026-11-04): Zstdnet did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; ZstdnetClient did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload.

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• com.mojang.authlib.minecraft.SessionService
• com.mojang.authlib.properties.Property
• com.mojang.authlib.properties.PropertyMap
• net.fabricmc.api.EnvType
• net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback
• net.fabricmc.fabric.api.client.command.v2.ClientCommands
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Join
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.minecraft.client.User
• net.minecraft.client.gui.Hud
• net.minecraft.client.gui.components.AbstractSelectionList
• net.minecraft.client.gui.components.AbstractSelectionList.Entry
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.components.StringWidget
• net.minecraft.client.gui.components.Tooltip
• net.minecraft.client.gui.layouts.GridLayout
• net.minecraft.client.gui.layouts.GridLayout.RowHelper
• net.minecraft.client.gui.screens.ConnectScreen
• net.minecraft.client.gui.screens.DirectJoinServerScreen
• net.minecraft.client.gui.screens.WorldOptionsScreen
• net.minecraft.client.gui.screens.multiplayer.JoinMultiplayerScreen
• net.minecraft.client.gui.screens.multiplayer.ServerSelectionList
• net.minecraft.client.gui.screens.multiplayer.ServerSelectionList.Entry
• and 33 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

A transparent proxy that ZSTD-compresses relayed client↔server traffic to cut public bandwidth by up to ~95% on high-repetition (Create / big modpack / FRP) servers — players notice nothing.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file zstdnet-26.3-fabric-1.4.2-m2.8.jar. The scan reads the mod's classes; it does not run them.