Viper LLM

Evidence

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

What it needs from Kiln

• Mixin
• net.minecraft.advancements.Advancement
• net.minecraft.advancements.DisplayInfo
• net.minecraft.commands.Commands
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.core.component.DataComponents
• net.minecraft.server.MinecraftServer
• net.minecraft.server.PlayerAdvancements
• net.minecraft.server.ServerAdvancementManager
• net.minecraft.server.level.ServerPlayer.RespawnConfig
• net.minecraft.server.network.Filterable
• net.minecraft.server.players.PlayerList
• net.minecraft.stats.ServerStatsCounter
• net.minecraft.stats.StatType
• net.minecraft.stats.Stats
• net.minecraft.util.context.ContextMap
• net.minecraft.world.Container
• net.minecraft.world.Difficulty
• net.minecraft.world.effect.MobEffectInstance
• net.minecraft.world.entity.EquipmentSlot
• net.minecraft.world.entity.player.Inventory
• net.minecraft.world.food.FoodData
• net.minecraft.world.item.component.WritableBookContent
• net.minecraft.world.item.component.WrittenBookContent
• net.minecraft.world.item.crafting.Ingredient
• net.minecraft.world.item.crafting.PlacementInfo
• net.minecraft.world.item.crafting.Recipe
• net.minecraft.world.item.crafting.RecipeHolder
• net.minecraft.world.item.crafting.RecipeManager
• net.minecraft.world.item.crafting.display.RecipeDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay
• net.minecraft.world.item.crafting.display.SlotDisplayContext
• net.minecraft.world.item.enchantment.EnchantmentHelper
• net.minecraft.world.item.enchantment.ItemEnchantments
• net.minecraft.world.level.GameType
• net.minecraft.world.level.LightLayer
• net.minecraft.world.level.block.entity.BlockEntity
• net.minecraft.world.level.block.entity.EnderChestBlockEntity
• net.minecraft.world.level.block.entity.SignBlockEntity
• net.minecraft.world.level.block.entity.SignText
• net.minecraft.world.level.block.entity.SignTextSlot
• and 43 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

A server-side Fabric mod that bridges Minecraft chat to LLM providers (OpenAI, Anthropic, Gemini, Ollama, OpenRouter, LM Studio). No client mods required.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file viper-llm-1.0.0.jar. The scan reads the mod's classes; it does not run them.