Auto Reauth

Evidence

Ran on Kiln's test stand (2026-11-04): Main did not start: java.lang.NoClassDefFoundError: net/minecraft/nbt/Tag.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.authlib.exceptions.AuthenticationException
• com.mojang.authlib.minecraft.SessionService
• com.mojang.authlib.minecraft.UserApiService
• com.mojang.authlib.services.MinecraftServicesDiscoveryService
• com.mojang.blaze3d.Blaze3D
• com.mojang.realmsclient.RealmsAvailability
• com.mojang.realmsclient.client.RealmsClient
• com.mojang.realmsclient.gui.RealmsDataFetcher
• net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback
• net.fabricmc.fabric.api.client.command.v2.ClientCommands
• net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource
• net.minecraft.client.KeyboardHandler
• net.minecraft.client.User
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.toasts.SystemToast
• net.minecraft.client.gui.components.toasts.SystemToast.SystemToastId
• net.minecraft.client.gui.components.toasts.ToastManager
• net.minecraft.client.gui.layouts.FrameLayout
• net.minecraft.client.gui.layouts.GridLayout
• net.minecraft.client.gui.layouts.GridLayout.RowHelper
• net.minecraft.client.gui.layouts.LayoutSettings
• net.minecraft.client.gui.screens.ConnectScreen
• net.minecraft.client.gui.screens.TitleScreen
• net.minecraft.client.gui.screens.social.PlayerSocialManager
• net.minecraft.client.multiplayer.ProfileKeyPairManager
• net.minecraft.client.multiplayer.ServerData
• net.minecraft.client.multiplayer.chat.report.ReportEnvironment
• net.minecraft.client.multiplayer.chat.report.ReportingContext
• net.minecraft.client.multiplayer.resolver.ServerAddress
• net.minecraft.client.quickplay.QuickPlay
• net.minecraft.client.quickplay.QuickPlayLog
• net.minecraft.client.quickplay.QuickPlayLog.Type
• net.minecraft.nbt.CompoundTag
• net.minecraft.nbt.ListTag
• net.minecraft.nbt.NbtIo
• net.minecraft.nbt.Tag
• net.minecraft.network.chat.CommonComponents
• net.minecraft.network.protocol.common.ClientboundDisconnectPacket
• and 27 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

Automatically re-authenticates your session when it expires, so you don't need to restart your game.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file auto-reauth-0.4.1-26.3.jar. The scan reads the mod's classes; it does not run them.