Client Side Cosmetics

Evidence

Ran on Kiln's test stand (2026-11-04): ClientSideCosmeticsClient did not start: java.lang.NoClassDefFoundError: net/minecraft/world/item/DyeColor.

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.platform.NativeImage
• 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.input.MouseButtonEvent
• net.minecraft.client.model.HumanoidModel
• net.minecraft.client.model.HumanoidModel.ArmPose
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.client.renderer.entity.EntityRenderDispatcher
• net.minecraft.client.renderer.entity.EntityRenderer
• net.minecraft.client.renderer.entity.state.AvatarRenderState
• net.minecraft.client.renderer.entity.state.EntityRenderState
• net.minecraft.client.renderer.entity.state.LivingEntityRenderState
• net.minecraft.client.renderer.texture.DynamicTexture
• net.minecraft.client.renderer.texture.TextureManager
• net.minecraft.client.resources.SkinManager
• net.minecraft.core.ClientAsset
• net.minecraft.core.ClientAsset.ResourceTexture
• net.minecraft.core.ClientAsset.Texture
• net.minecraft.core.HolderLookup.RegistryLookup
• net.minecraft.core.RegistryAccess
• net.minecraft.core.RegistryAccess.Frozen
• net.minecraft.core.component.DataComponentInitializers
• net.minecraft.core.component.DataComponentInitializers.PendingComponents
• net.minecraft.core.component.DataComponentMap
• net.minecraft.core.component.DataComponentMap.Builder
• net.minecraft.core.component.DataComponents
• net.minecraft.data.registries.VanillaRegistries
• net.minecraft.util.FormattedCharSequence
• net.minecraft.util.Mth
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.EquipmentSlot
• net.minecraft.world.entity.HumanoidArm
• net.minecraft.world.entity.Pose
• net.minecraft.world.entity.player.PlayerSkin
• net.minecraft.world.item.DyeColor
• net.minecraft.world.item.equipment.trim.ArmorTrim
• net.minecraft.world.level.block.ColorCollection
• and 62 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

Customize your armor trims, shield banners, and capes client-side with a 360° player preview and improved shield rendering.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file clientsidecosmetics-26.3-3.6.0+mc26.3.jar. The scan reads the mod's classes; it does not run them.