Unified 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): UnifiedFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/block/state/BlockBehaviour$StatePredicate; UnifiedFabricClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/event/lifecycle/v1/ClientLifecycleEvents.

What it needs from Kiln

an access widener
Mixin
com.mojang.blaze3d.platform.NativeImage
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStarted
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents.ClientStopping
net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents
net.fabricmc.fabric.api.entity.event.v1.ServerLivingEntityEvents.AfterDeath
net.fabricmc.fabric.api.entity.event.v1.ServerPlayerEvents.Join
net.fabricmc.fabric.api.entity.event.v1.ServerPlayerEvents.Leave
net.fabricmc.fabric.api.event.lifecycle.v1.ServerEntityEvents.EquipmentChange
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents.Load
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents.Unload
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.EndDataPackReload
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopped
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndLevelTick
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.StartLevelTick
net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.StartTick
net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents
net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents.ModifyCallback
net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents.ModifyConsumer
net.fabricmc.fabric.api.item.v1.DefaultItemComponentEvents.ModifyContext
net.minecraft.advancements.predicates.ItemPredicate
net.minecraft.advancements.predicates.ItemPredicate.Builder
net.minecraft.advancements.predicates.MinMaxBounds
net.minecraft.advancements.predicates.MinMaxBounds.Ints
net.minecraft.advancements.triggers.BredAnimalsTrigger
net.minecraft.advancements.triggers.BredAnimalsTrigger.TriggerInstance
net.minecraft.advancements.triggers.CriteriaTriggers
net.minecraft.advancements.triggers.EnterBlockTrigger
net.minecraft.advancements.triggers.EnterBlockTrigger.TriggerInstance
net.minecraft.advancements.triggers.InventoryChangeTrigger
net.minecraft.advancements.triggers.InventoryChangeTrigger.TriggerInstance
net.minecraft.advancements.triggers.ItemUsedOnLocationTrigger
net.minecraft.client.model.HumanoidModel
net.minecraft.client.model.geom.EntityModelSet
and 81 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

A comprehensive data-driven multiloader modding api built for both modders and data-packers

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file unified-api-26.3-1.0-beta-23+fabric.jar. The scan reads the mod's classes; it does not run them.

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