OP Tools

Evidence

Ran on Kiln's test stand (2026-11-04): OpTools did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.BuiltInRegistries does not have member field 'net.minecraft.core.Registry ENCHANTMENT_ENTITY_EFFECT_TYPE'; OpToolsClient did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.BuiltInRegistries does not have member field 'net.minecraft.core.Registry MENU'.

What it needs from Kiln

• net.fabricmc.fabric.api.attachment.v1.AttachmentRegistry
• net.fabricmc.fabric.api.biome.v1.BiomeModifications
• net.fabricmc.fabric.api.biome.v1.BiomeSelectors
• net.fabricmc.fabric.api.creativetab.v1.FabricCreativeModeTab
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndLevelTick
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.After
• net.fabricmc.fabric.api.menu.v1.ExtendedMenuProvider
• net.fabricmc.fabric.api.menu.v1.ExtendedMenuType
• net.fabricmc.fabric.api.menu.v1.ExtendedMenuType.ExtendedFactory
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder.Factory
• net.minecraft.client.gui.screens.MenuScreens
• net.minecraft.client.gui.screens.MenuScreens.ScreenConstructor
• net.minecraft.client.gui.screens.inventory.AbstractContainerScreen
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.core.Direction.Axis
• net.minecraft.core.NonNullList
• net.minecraft.core.RegistryAccess
• net.minecraft.core.component.DataComponents
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.tags.BlockTags
• net.minecraft.tags.TagKey
• net.minecraft.util.Util
• net.minecraft.world.Container
• net.minecraft.world.ContainerHelper
• net.minecraft.world.Containers
• net.minecraft.world.SimpleContainer
• net.minecraft.world.WorldlyContainer
• net.minecraft.world.effect.MobEffectInstance
• net.minecraft.world.effect.MobEffects
• net.minecraft.world.entity.EntityTypes
• net.minecraft.world.entity.LightningBolt
• net.minecraft.world.entity.Mob
• net.minecraft.world.entity.MoverType
• net.minecraft.world.entity.ai.navigation.PathNavigation
• and 80 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4)

In the author's words

Just a small mod I made that adds some op tools to the game.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file op-tools-1.8.4+26.3.jar. The scan reads the mod's classes; it does not run them.