PackTest

Evidence

Ran on Kiln's test stand (2026-11-04): PackTest did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/storage/LevelStorageSource$LevelStorageAccess.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.authlib.GameProfile
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.minecraft.advancements.predicates.MinMaxBounds
• net.minecraft.advancements.predicates.MinMaxBounds.Doubles
• net.minecraft.advancements.predicates.MinMaxBounds.Ints
• net.minecraft.advancements.triggers.AnyBlockInteractionTrigger
• net.minecraft.advancements.triggers.CriteriaTriggers
• net.minecraft.advancements.triggers.PlayerInteractTrigger
• net.minecraft.commands.CommandResultCallback
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.FunctionInstantiationException
• net.minecraft.commands.arguments.ComponentArgument
• net.minecraft.commands.arguments.DimensionArgument
• net.minecraft.commands.arguments.EntityArgument
• net.minecraft.commands.arguments.IdentifierArgument
• net.minecraft.commands.arguments.NbtPathArgument
• net.minecraft.commands.arguments.NbtPathArgument.NbtPath
• net.minecraft.commands.arguments.ObjectiveArgument
• net.minecraft.commands.arguments.RangeArgument
• net.minecraft.commands.arguments.RangeArgument.Floats
• net.minecraft.commands.arguments.RangeArgument.Ints
• net.minecraft.commands.arguments.ResourceOrIdArgument
• net.minecraft.commands.arguments.ResourceOrIdArgument.LootPredicateArgument
• net.minecraft.commands.arguments.ResourceOrTagArgument
• net.minecraft.commands.arguments.ResourceOrTagArgument.Result
• net.minecraft.commands.arguments.ScoreHolderArgument
• net.minecraft.commands.arguments.SlotSourceArgument
• net.minecraft.commands.arguments.SlotSourceArgument.Result
• net.minecraft.commands.arguments.TimeArgument
• net.minecraft.commands.arguments.blocks.BlockPredicateArgument
• net.minecraft.commands.arguments.coordinates.BlockPosArgument
• net.minecraft.commands.arguments.coordinates.Coordinates
• net.minecraft.commands.arguments.coordinates.Vec3Argument
• net.minecraft.commands.arguments.item.FunctionArgument
• net.minecraft.commands.arguments.item.ItemPredicateArgument
• net.minecraft.commands.arguments.item.ItemPredicateArgument.Result
• net.minecraft.commands.arguments.selector.EntitySelector
• net.minecraft.commands.execution.ChainModifiers
• and 40 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

Fabric mod for testing data packs, with data packs!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file packtest-2.8.0.jar. The scan reads the mod's classes; it does not run them.