Formations (Structure Library)

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

Evidence

Ran on Kiln's test stand (2026-11-04): Formations did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/levelgen/structure/Structure; FormationsClient did not start: java.lang.NoSuchMethodError: 'boolean net.fabricmc.loader.api.FabricLoader.isModLoaded(java.lang.String)'.

What it needs from Kiln

an access widener
Mixin
com.mojang.blaze3d.vertex.PoseStack
com.mojang.math.Axis
net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents
net.fabricmc.fabric.api.entity.event.v1.ServerEntityLevelChangeEvents.AfterPlayerChange
net.fabricmc.fabric.api.event.player.UseBlockCallback
net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
net.minecraft.client.Camera
net.minecraft.client.Options
net.minecraft.client.gui.Font.DisplayMode
net.minecraft.client.renderer.GameRenderer
net.minecraft.client.renderer.SubmitNodeCollector
net.minecraft.client.resources.language.I18n
net.minecraft.commands.CommandSourceStack
net.minecraft.commands.Commands
net.minecraft.commands.Commands.CommandSelection
net.minecraft.core.BlockPos.MutableBlockPos
net.minecraft.core.Direction.Plane
net.minecraft.core.HolderSet
net.minecraft.core.HolderSet.Named
net.minecraft.core.NonNullList
net.minecraft.core.RegistryAccess
net.minecraft.nbt.CompoundTag
net.minecraft.nbt.ListTag
net.minecraft.nbt.NbtIo
net.minecraft.nbt.StringTag
net.minecraft.network.FriendlyByteBuf
net.minecraft.network.chat.Style
net.minecraft.server.MinecraftServer
net.minecraft.server.ReloadableServerRegistries
net.minecraft.server.ReloadableServerRegistries.Holder
net.minecraft.server.network.ServerGamePacketListenerImpl
net.minecraft.server.permissions.PermissionSet
net.minecraft.server.permissions.Permissions
net.minecraft.tags.EnchantmentTags
net.minecraft.util.ExtraCodecs
net.minecraft.util.FormattedCharSequence
net.minecraft.util.LightCoordsUtil
net.minecraft.util.ProblemReporter
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

Formations adds utilities for structure datapacks!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file formations-1.0.4-fabric-mc26.3.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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