Codec2Schema

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

What it needs from Kiln

an access widener
Mixin
net.fabricmc.api.EnvType
net.fabricmc.fabric.impl.dimension.FailSoftMapCodec
net.fabricmc.loader.api.ModContainer
net.fabricmc.loader.api.Version
net.fabricmc.loader.api.entrypoint.EntrypointContainer
net.fabricmc.loader.api.metadata.ModMetadata
net.minecraft.SharedConstants
net.minecraft.WorldVersion
net.minecraft.advancements.Advancement
net.minecraft.client.PeriodicNotificationManager
net.minecraft.client.gui.font.FontManager
net.minecraft.client.gui.font.FontManager.FontDefinitionFile
net.minecraft.client.renderer.PostChainConfig
net.minecraft.client.renderer.block.dispatch.BlockStateModelDispatcher
net.minecraft.client.renderer.block.dispatch.SingleVariant
net.minecraft.client.renderer.block.dispatch.SingleVariant.Unbaked
net.minecraft.client.renderer.item.ClientItem
net.minecraft.client.renderer.texture.atlas.SpriteSources
net.minecraft.client.resources.WaypointStyle
net.minecraft.client.resources.model.EquipmentClientInfo
net.minecraft.core.Rotations
net.minecraft.core.UUIDUtil
net.minecraft.core.component.BlockTransformer
net.minecraft.core.component.DataComponentPatch
net.minecraft.core.component.DataComponentType
net.minecraft.core.registries.codec.HolderSetCodec
net.minecraft.core.registries.codec.RegistryFileCodec
net.minecraft.core.registries.codec.RegistryFixedCodec
net.minecraft.gametest.framework.GameTestInstance
net.minecraft.gametest.framework.TestEnvironmentDefinition
net.minecraft.nbt.TagParser
net.minecraft.network.chat.ChatType
net.minecraft.network.chat.ComponentSerialization
net.minecraft.network.chat.ComponentSerialization.FuzzyCodec
net.minecraft.network.chat.ComponentSerialization.StrictEither
net.minecraft.resources.RegistryDataLoader
net.minecraft.resources.RegistryDataLoader.RegistryData
net.minecraft.server.dialog.Dialog
net.minecraft.tags.TagFile
net.minecraft.util.ExtraCodecs
and 39 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 tool to convert codecs to JSON schemas.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file codec2schema-0.3.7+26.3-pre-1.jar. The scan reads the mod's classes; it does not run them.

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