LegacyChecker
LegacyChecker is a Forge utility for 1.12.2 that verifies a set of required mods is installed before a player can enter the game.
What it does
On startup the mod checks that every mandatory mod in a modpack is present, so a player missing one is stopped before reaching the world. It writes its own YAML configuration automatically, where the list of required mods is defined. Only the client needs it, so servers run without it. Shadow Config is required and must be installed alongside it.
Key features
Required mod check
Players are checked for each mandatory mod named in the configuration before entering the game.
Automatic YAML config
The configuration file is generated automatically, so the list of required mods can be edited without writing it from scratch.
Lightweight utility
The mod is small in scope, doing one check at launch and nothing else during play.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Questions
Does LegacyChecker need Shadow Config?
Is LegacyChecker available for newer Minecraft versions?
In the catalog
LegacyChecker is one of 7,555 Cursed mods on ModsFinder, and one of 3,426 Cursed mods for Forge. 2,920 mods support Minecraft 1.12.2.
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What the author says
A lightweight, fail-safe utility mod that ensures players have all mandatory mods installed before entering the game. It elegantly solves license restrictions (like All Rights Reserved / ARR) that prevent modpack authors from bundling specific mods directly into modpack files.
Official listing
- Modrinth page
- modrinth.com/mod/legacychecker
- Owner
- ShadowKing21_
- Published
- 2026-06-18
- Updated on Modrinth
- 2026-06-18
- Facts verified
- 2026-10-15