Xaero Head Tracker

Evidence

Ran on Kiln's test stand (2026-11-04): XaeroHeadTracker did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload; XaeroHeadTrackerClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/components/AbstractButton.

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback
• net.fabricmc.fabric.api.client.command.v2.ClientCommands
• net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• 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.client.screen.v1.ScreenEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterExtract
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterInit
• net.fabricmc.fabric.api.client.screen.v1.ScreenKeyboardEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenKeyboardEvents.AllowKeyPress
• net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents.AllowMouseClick
• 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.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.minecraft.client.gui.components.AbstractButton
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.components.Tooltip
• net.minecraft.client.input.MouseButtonEvent
• net.minecraft.client.multiplayer.PlayerInfo
• net.minecraft.client.multiplayer.ServerData
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.client.resources.DefaultPlayerSkin
• net.minecraft.client.server.IntegratedServer
• net.minecraft.core.ClientAsset
• net.minecraft.core.ClientAsset.Texture
• net.minecraft.core.UUIDUtil
• net.minecraft.network.codec.ByteBufCodecs
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• and 32 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

Displays other players' avatars on your Xaero's world map, no matter how far away they are!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file XaeroHeadTracker-2.1.2-fabric-26.3.jar. The scan reads the mod's classes; it does not run them.