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Mojang Dev Tools

Mojang Dev Tools

Unlocks the Mojang Development tools, useful for mod devs and players looking to understand more about the game!

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31
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Compatibility

Minecraft: Java Edition

26.1.2

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Details

Licensed GPL-3.0-or-later
Published 2 weeks ago

Mojang Dev Tools

Brain and Path Example

Unlocks all hidden developer features normally only available inside Mojang's IDE — with an in-game config menu to toggle each flag individually. ALL TOOLS EXIST IN OFFICIALLY RELEASED MOJANG BINARIES, THIS MOD SIMPLY ENABLES THE FLAGS

Sets SharedConstants.IS_RUNNING_IN_IDE = true and MC_DEBUG_HOTKEYS=true at class-load time, enabling debug overlays, internal commands, and dev-mode keybinds that are shipped in the game but never exposed in production.

Requirements

  • Minecraft 26.1.2
  • Fabric Loader 0.19.2 or later

Key Features

Debug Keybinds (F3 held)

Hotkey Action
F3 + Z Custom debug renderer menu
F3 + F6 Mojang internal debug options menu
F3 + E Chunk section path debug overlay
F3 + F Toggle fog rendering
F3 + L Toggle smart culling
F3 + O Frustum culling octree overlay
F3 + U Freeze/capture frustum at current position
F3 + V Chunk section visibility overlay
F3 + W Wireframe rendering mode

Note: F3+F with this mod enabled toggles fog instead of cycling render distance — this is the dev-mode override.

Renderer Overlays

Toggle any of these in-game via F3 + F6:

  • Pathfinding route overlay
  • Block neighbor update overlay
  • Structure bounding box overlay
  • Mob brain & memory overlay
  • AI goal selector overlay
  • Point of interest (POI) overlay
  • Bee hive/path overlay
  • Raid state overlay
  • Village section overlay
  • Entity hitbox overlay (integrated server)
  • Block collision shape overlay
  • Sculk catalyst spread overlay
  • Breeze mob debug overlay
  • Experimental redstone wire update order overlay

World Generation Debug

  • Cave carver volume overlay
  • Ore vein bounds and type overlay
  • Aquifer cell boundary overlay
  • Per-chunk feature placement count heatmap
  • Large dripstone cluster overlay
  • Disable individual world gen passes (fluids, aquifers, surface, carvers, structures, features, ore veins, blending, retrogeneration)

Gameplay & QOL Flags

  • All villager trade tiers unlocked immediately
  • Ignore mob cap on integrated server
  • Open worlds from incompatible versions
  • Allow simulation distance below the normal minimum
  • Keep jigsaw blocks after structure generation
  • Structure edit mode
  • Save structures as SNBT text files
  • Per-tick timing monitor
  • Show all sound subtitles
  • Suppress outbound Mojang telemetry
  • Cursor position in F3 overlay
  • Suppress all world saves (world reverts on exit)

Internal Server Commands

Unlocked when IS_RUNNING_IN_IDE is active:

  • /raid — Force-start/stop raids, set omen level, spawn raid captains, toggle raider glow
  • /debugpath to <x> <y> <z> — Visualize pathfinding routes in-world
  • /debugmobspawning at <x> <y> <z> — Diagnose mob spawning per category
  • /warden_spawn_tracker — Read/write warden warning levels for nearby players
  • /spawn_armor_trims — Spawn all armor trim combinations on armor stands
  • /serverpack push/pop — Push/pop server resource packs to clients without restarting
  • /chase — Sync camera between two game instances (Mojang QA tool)