Viewfinder

Evidence

Ran on Kiln's test stand (2026-11-04): Viewfinder did not start: java.lang.NoSuchMethodError: 'java.util.Optional net.fabricmc.loader.api.FabricLoader.getModContainer(java.lang.String)'; ViewfinderClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/command/v2/ClientCommandRegistrationCallback.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.pipeline.RenderTarget
• com.mojang.blaze3d.platform.Window
• com.mojang.renderpearl.backend.opengl.GlTexture
• 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.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.SharedConstants
• net.minecraft.WorldVersion
• net.minecraft.client.OptionInstance
• net.minecraft.client.OptionInstance.ValueSet
• net.minecraft.client.Options
• net.minecraft.client.Screenshot
• net.minecraft.client.renderer.GameRenderer
• net.minecraft.network.chat.ClickEvent
• net.minecraft.network.chat.ClickEvent.CopyToClipboard
• net.minecraft.network.chat.ClickEvent.OpenFile
• net.minecraft.network.chat.ClickEvent.OpenUrl
• net.minecraft.network.chat.ClickEvent.SuggestCommand
• net.minecraft.network.chat.HoverEvent
• net.minecraft.network.chat.HoverEvent.ShowText
• net.minecraft.network.chat.Style
• net.minecraft.server.MinecraftServer
• net.minecraft.server.ServerTickRateManager
• net.minecraft.server.players.PlayerList
• net.minecraft.world.clock.ServerClockManager
• net.minecraft.world.level.dimension.DimensionType
• org.lwjgl.opengl.GL11C
• org.lwjgl.opengl.GL20C
• org.lwjgl.opengl.GL30C
• org.lwjgl.opengl.GL33C
• org.lwjgl.opengl.GL41C
• org.lwjgl.opengl.GL43C
• org.lwjgl.system.MemoryStack
• org.lwjgl.system.MemoryUtil
• ImmutableMap.forEach()
• ImmutableMap.size()
• ImmutableSet.forEach()
• and 17 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 shader debugging mod for Iris on Fabric that exposes an MCP server and in-game commands for external tools and scripts to inspect, test, and automate shader development workflows.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file viewfinder-26.3-2.1.4+26.3.jar. The scan reads the mod's classes; it does not run them.