Capability Proxy

Evidence

Ran on Kiln's test stand (2026-11-04): CapabilityProxyFabric did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/particle/v1/ParticleProviderRegistry$PendingParticleProvider.

What it needs from Kiln

• an access widener
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.blaze3d.vertex.PoseStack.Pose
• com.mojang.blaze3d.vertex.VertexConsumer
• net.fabricmc.fabric.api.lookup.v1.block.BlockApiLookup
• net.fabricmc.fabric.api.lookup.v1.custom.ApiLookupMap
• net.fabricmc.fabric.api.lookup.v1.entity.EntityApiLookup
• net.fabricmc.fabric.api.lookup.v1.item.ItemApiLookup
• net.fabricmc.fabric.api.transfer.v1.context.ContainerItemContext
• net.fabricmc.fabric.api.transfer.v1.fluid.FluidStorage
• net.fabricmc.fabric.api.transfer.v1.item.ContainerStorage
• net.fabricmc.fabric.api.transfer.v1.item.ItemStorage
• net.fabricmc.fabric.api.transfer.v1.storage.Storage
• net.fabricmc.fabric.impl.lookup.block.BlockApiLookupImpl
• net.fabricmc.fabric.impl.lookup.custom.ApiLookupMapImpl
• net.fabricmc.fabric.impl.lookup.entity.EntityApiLookupImpl
• net.fabricmc.fabric.impl.lookup.item.ItemApiLookupImpl
• net.minecraft.client.gui.screens.MenuScreens
• net.minecraft.client.gui.screens.MenuScreens.ScreenConstructor
• net.minecraft.client.renderer.SubmitNodeCollector
• net.minecraft.client.renderer.SubmitNodeCollector.CustomGeometryRenderer
• net.minecraft.client.renderer.blockentity.BlockEntityRenderer
• net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider
• net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider.Context
• net.minecraft.client.renderer.blockentity.state.BlockEntityRenderState
• net.minecraft.client.renderer.feature.ModelFeatureRenderer
• net.minecraft.client.renderer.feature.ModelFeatureRenderer.CrumblingOverlay
• net.minecraft.client.renderer.rendertype.RenderTypes
• net.minecraft.core.component.DataComponents
• net.minecraft.gametest.framework.GameTestAssertException
• net.minecraft.gametest.framework.GameTestHelper
• net.minecraft.world.MenuProvider
• net.minecraft.world.entity.EntityTypes
• net.minecraft.world.entity.vehicle.minecart.MinecartChest
• net.minecraft.world.flag.FeatureFlags
• net.minecraft.world.inventory.MenuType
• net.minecraft.world.inventory.Slot
• net.minecraft.world.item.CreativeModeTab.Builder
• net.minecraft.world.item.component.ItemContainerContents
• net.minecraft.world.level.GameType
• net.minecraft.world.level.block.HopperBlock
• and 27 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

Access block capabilities from multiple sides

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file capabilityproxy-26.3-fabric-2.2.3-245.jar. The scan reads the mod's classes; it does not run them.