Declarative UI

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

Evidence

Ran on Kiln's test stand (2026-11-04): DeclarativeUI did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/event/registry/FabricRegistryBuilder.

What it needs from Kiln

an access widener
Mixin
net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
net.fabricmc.fabric.api.event.registry.DynamicRegistries
net.fabricmc.fabric.api.event.registry.FabricRegistryBuilder
net.minecraft.advancements.predicates.MinMaxBounds
net.minecraft.advancements.predicates.MinMaxBounds.Ints
net.minecraft.commands.CommandBuildContext
net.minecraft.commands.CommandResultCallback
net.minecraft.commands.CommandSourceStack
net.minecraft.commands.Commands
net.minecraft.commands.Commands.CommandSelection
net.minecraft.commands.FunctionInstantiationException
net.minecraft.commands.arguments.AngleArgument
net.minecraft.commands.arguments.ComponentArgument
net.minecraft.commands.arguments.CompoundTagArgument
net.minecraft.commands.arguments.DimensionArgument
net.minecraft.commands.arguments.EntityAnchorArgument
net.minecraft.commands.arguments.EntityArgument
net.minecraft.commands.arguments.GameModeArgument
net.minecraft.commands.arguments.GameProfileArgument
net.minecraft.commands.arguments.HeightmapTypeArgument
net.minecraft.commands.arguments.HexColorArgument
net.minecraft.commands.arguments.IdentifierArgument
net.minecraft.commands.arguments.MessageArgument
net.minecraft.commands.arguments.NbtPathArgument
net.minecraft.commands.arguments.NbtTagArgument
net.minecraft.commands.arguments.ObjectiveArgument
net.minecraft.commands.arguments.ObjectiveCriteriaArgument
net.minecraft.commands.arguments.OperationArgument
net.minecraft.commands.arguments.ParticleArgument
net.minecraft.commands.arguments.RangeArgument
net.minecraft.commands.arguments.RangeArgument.Floats
net.minecraft.commands.arguments.RangeArgument.Ints
net.minecraft.commands.arguments.ResourceArgument
net.minecraft.commands.arguments.ResourceKeyArgument
net.minecraft.commands.arguments.ResourceOrIdArgument
net.minecraft.commands.arguments.ResourceOrIdArgument.ContextFloatProviderArgument
net.minecraft.commands.arguments.ResourceOrIdArgument.ContextIntProviderArgument
net.minecraft.commands.arguments.ResourceOrIdArgument.DialogArgument
net.minecraft.commands.arguments.ResourceOrIdArgument.FeatureArgument
net.minecraft.commands.arguments.ResourceOrIdArgument.LootModifierArgument
and 48 more

On the roadmap: Code next to data (0.3), Mixin (0.5)

In the author's words

Adds data-driven UI, like GUIs and Commands, fully server-side.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file declarative-ui-1.3.2+26.3.jar. The scan reads the mod's classes; it does not run them.

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