PathWeaver

Evidence

Ran on Kiln's test stand (2026-11-04): PathWeaver did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/command/v2/CommandRegistrationCallback.

What it needs from Kiln

• Mixin
• net.fabricmc.api.EnvType
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.fabricmc.loader.api.metadata.ModOrigin
• net.fabricmc.loader.api.metadata.ModOrigin.Kind
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.core.SectionPos
• net.minecraft.server.MinecraftServer
• net.minecraft.world.entity.EntitySpawnReason
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.Mob
• net.minecraft.world.entity.ai.navigation.PathNavigation
• net.minecraft.world.entity.monster.zombie.Zombie
• net.minecraft.world.level.BlockGetter
• net.minecraft.world.level.PathNavigationRegion
• net.minecraft.world.level.pathfinder.AmphibiousNodeEvaluator
• net.minecraft.world.level.pathfinder.FlyNodeEvaluator
• net.minecraft.world.level.pathfinder.Node
• net.minecraft.world.level.pathfinder.NodeEvaluator
• net.minecraft.world.level.pathfinder.Path
• net.minecraft.world.level.pathfinder.PathFinder
• net.minecraft.world.level.pathfinder.PathTypeCache
• net.minecraft.world.level.pathfinder.PathfindingContext
• net.minecraft.world.level.pathfinder.SwimNodeEvaluator
• net.minecraft.world.level.pathfinder.WalkNodeEvaluator
• FabricLoader.getAllMods()
• FabricLoader.getEnvironmentType()
• FabricLoader.getModContainer()
• BuiltInRegistries.ENTITY_TYPE

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

Mob pathfinding runs on the server thread and causes tick spikes. PathWeaver moves it to spare CPU cores: mean tick roughly halved with 1024 mobs, worst-1% ticks down 55-61%. Server-side, clients need nothing. Read the warning before installing.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file pathweaver-0.9.0+26.3.jar. The scan reads the mod's classes; it does not run them.