Bundle API

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): FabricMod did not start: java.lang.NoClassDefFoundError: net/minecraft/core/component/predicates/DataComponentPredicate$Type.

What it needs from Kiln

Mixin
net.minecraft.advancements.predicates.CollectionPredicate
net.minecraft.advancements.predicates.ItemPredicate
net.minecraft.advancements.predicates.SingleComponentItemPredicate
net.minecraft.core.component.DataComponentType
net.minecraft.core.component.DataComponentType.Builder
net.minecraft.core.component.DataComponents
net.minecraft.core.component.predicates.DataComponentPredicate
net.minecraft.core.component.predicates.DataComponentPredicate.ConcreteType
net.minecraft.core.component.predicates.DataComponentPredicate.Type
net.minecraft.network.codec.ByteBufCodecs
net.minecraft.network.codec.StreamCodec
net.minecraft.network.codec.StreamCodec.CodecOperation
net.minecraft.world.inventory.Slot
net.minecraft.world.inventory.tooltip.TooltipComponent
net.minecraft.world.item.ItemInstance
net.minecraft.world.item.ItemProvider
net.minecraft.world.item.ItemStackTemplate
net.minecraft.world.item.component.Bees
net.minecraft.world.item.component.BundleContents
net.minecraft.world.item.component.ContainerComponent
net.minecraft.world.item.component.ContainerComponent.Mutable
net.minecraft.world.item.component.GrowableMutableContainer
net.minecraft.world.level.block.entity.BeehiveBlockEntity
net.minecraft.world.level.block.entity.BeehiveBlockEntity.Occupant
net.minecraft.world.level.storage.loot.ContainerComponentManipulator
net.minecraft.world.level.storage.loot.ContainerComponentManipulators
org.apache.commons.lang3.math.Fraction
Item.canFitInsideContainerItems()
ItemStack.copyWithCount()
ItemStack.isSameItemSameComponents()
ItemStack.isStackable()

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

Bundle API allows mod authors to easily add bundles that can hold more than 1 stack of items specified by an item tag.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file bundle-api-fabric-5.0.0+26.3.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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