copypaster

Evidence

Ran on Kiln's test stand (2026-11-04): CopyPasterMod did not start: java.lang.NoClassDefFoundError: net/minecraft/core/HolderGetter; CopyPasterClientMod did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/networking/v1/PayloadTypeRegistry.

What it needs from Kiln

• 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.command.v2.CommandRegistrationCallback
• 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.message.v1.ServerMessageEvents
• net.fabricmc.fabric.api.message.v1.ServerMessageEvents.AllowChatMessage
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Disconnect
• 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.screens.ChatScreen
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.core.HolderGetter
• net.minecraft.core.HolderLookup.RegistryLookup
• net.minecraft.core.RegistryAccess
• net.minecraft.core.RegistryAccess.Frozen
• net.minecraft.gizmos.GizmoProperties
• net.minecraft.gizmos.GizmoStyle
• net.minecraft.gizmos.Gizmos
• net.minecraft.gizmos.Gizmos.TemporaryCollection
• net.minecraft.nbt.ByteTag
• net.minecraft.nbt.CompoundTag
• net.minecraft.nbt.IntTag
• net.minecraft.nbt.ListTag
• net.minecraft.nbt.NbtAccounter
• net.minecraft.nbt.NbtIo
• net.minecraft.nbt.NbtUtils
• net.minecraft.nbt.StringTag
• net.minecraft.nbt.Tag
• net.minecraft.network.RegistryFriendlyByteBuf
• and 44 more

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

In the author's words

Copy and paste Minecraft structures with player-relative positioning, ghost preview, persistent undo, and an optional browser editor.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file copy_paster-3.5.1+26.3.jar. The scan reads the mod's classes; it does not run them.