Backslot Mod

Evidence

Ran on Kiln's test stand (2026-11-04): BackslotMod did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/networking/v1/ServerPlayNetworking$PlayPayloadHandler; BackslotModClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/resource/IdentifiableResourceReloadListener.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Join
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.resource.ResourceManagerHelper
• net.fabricmc.fabric.api.resource.SimpleSynchronousResourceReloadListener
• net.fabricmc.fabric.impl.resource.pack.ModPackResourcesUtil
• net.minecraft.client.Options
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.EntityArgument
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
• net.minecraft.server.packs.PackType
• net.minecraft.server.packs.resources.Resource
• net.minecraft.server.packs.resources.ResourceManager
• net.minecraft.server.packs.resources.ResourceManager.Selector
• net.minecraft.server.permissions.PermissionSet
• net.minecraft.server.permissions.Permissions
• net.minecraft.tags.TagKey
• net.minecraft.world.level.storage.ValueInput
• net.minecraft.world.level.storage.ValueOutput
• net.fabricmc.fabric.api.resource.IdentifiableResourceReloadListener
• KeyMapping.isDown()
• Minecraft.getResourceManager()
• Minecraft.options
• DefaultedRegistry.iterator()
• Holder.Reference.is()
• ServerPlayer.sendSystemMessage()
• Player.getDisplayName()
• Item.builtInRegistryHolder()
• ItemStack.OPTIONAL_CODEC
• ItemStack.getHoverName()
• and 3 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

This mod adds Another inventory Slot: The Backslot!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file backslot-1.2.2.jar. The scan reads the mod's classes; it does not run them.