ReActions 
ReActions plugin for Paper is a tool to handle server events. It gives you an ability to check for specific flags, and by its results, perform different actions. Syntax is unbelievable simple:
EVENT:
activator:
condition-check: condition
flags:
- FLAG=test
- ANOTHER_FLAG=test:value
actions:
- ACTION=do:something
reactions:
- ACTION=do:{something, but if flag wasn't successful}
- ANOTHER_ACTION=do something else
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as ReActions.jar — drop this file into the mods folder
- Download size: 891 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.