Spawn Doctor

Mob farm gone quiet? Run /spawndoctor for clues.

The report checks common blockers such as difficulty and mob-spawning settings, counts loaded hostile mobs, and gives spawning-distance guidance. It can help you decide where to investigate next without reading server logs.

Any player can use it, with a cooldown between scans. It reports what it finds without changing the world. It is a starting point for diagnosis, not a full check of every farm design or exact mob-cap calculation.

Server-side — install on the server only.

Paid commissions for videos, streams and servers. Send me your idea: [email protected]

All Rights Reserved. Free to include in any modpack, on any platform, monetized or not, without permission or credit.

Source: https://github.com/KURONAMI333/spawn-doctor

Bugs and questions: comment on the CurseForge page or DM @kuronami333 on X.

Spawn Doctor

You built the mob farm exactly like the tutorial and nothing spawns. /spawndoctor tells you why, in plain words — not a flame graph, not an overlay.

Spawn-overlay mods only show light level. None of them explain why a correctly-built farm produces nothing: hostiles loaded far away eating the spawn budget, an AFK spot too close, or simulation distance. Stand where you expect spawns and run the command.

Spawn Doctor — why your mob farm is dead:
42 hostile mobs are loaded FAR from you vs only 3 nearby. The far ones eat
the same spawn budget your farm needs — light up caves / clear them.
 ┃ Mobs spawn 24-128 blocks from a player: AFK at least 24 blocks away…
 ┃ Server simulation distance: 10 chunks — the farm must be within that…

It calls out the dead-certain causes (Peaceful difficulty, doMobSpawning off), surfaces the usual silent killer (far-loaded hostiles eating the cap), and always states the universal spawn rules (the 24–128 ring, simulation distance). The mob-cap formula is version-sensitive, so it never claims an exact "cap X/Y" — a wrong number is worse than none. Open to all players, 30-second cooldown (ops bypass).

Read-only and on-demand: no mixin, no config, no blocks or items.

Server-side — install on the server only.

Paid commissions for videos, streams and servers. Send me your idea: [email protected]

Bugs and questions: comment on the CurseForge page, or DM @kuronami333 on X.

Free to use in any modpack. Source: https://github.com/KURONAMI333/spawn-doctor