Mob Spawn Checker (MSC)

Mob Spawn Checker (MSC) is the ultimate diagnostic tool designed for mod developers and modpack creators to save hours of tedious testing. Tired of wandering around your world trying to figure out if your newly added custom mobs are actually spawning? With MSC, you can test and inspect mob spawn mechanics in real-time.

Simply press H to open the mob catalog, select any mob, and run a spawn test. The mod monitors the environment for 5 seconds (for monsters) or 20 seconds (for creatures) and breaks down exactly why a mob is or isn't spawning, highlighting the exact failure step if it gets blocked.

Key Features

• Real-Time Spawn Testing & Diagnostics: Runs active tests to determine if a mob attempts and succeeds in spawning, utilizing an 8-door verification pipeline (Game Rules, Difficulty, Biome/Dimension, Mob Cap, Floor/Terrain, Light Level, Free Space, and World Insertion).
• Comprehensive Catalog & Filters: Search for mobs by their English names regardless of language, filter by favorites, view mobs without spawn eggs, or isolate mod-specific mobs.
• Environment Controls: Quickly toggle between Day, Night, Weather conditions, and teleport to valid biomes or dimensions right from the interface.
• Variant & Custom Support: Switch between mob variants and manually spawn entities in Creative mode. Fully optimized for Vanilla and Cannibal Villages, with wide compatibility for external modded mobs.
• Multi-Language Support: Fully translated into English, Portuguese (BR), German, Spanish (ES), French, Russian, Turkish, and partially Simplified Chinese.