Drop in the plugin, paste your key, and GuardAC starts watching fights.
Download the jar and drop it into plugins/. One jar covers every supported version, so there is nothing to choose.
Start it once so that plugins/GuardAC/ and its config get created.
Open plugins/GuardAC/config.yml, find the ai: section and replace the value of the api-key line inside it with your key. Save the file and run /guard reload.
ai: api-key: "gac_xxxxxxxxxxxxxxxx"
/guard monitor shows checks live in combat, /guard stats gives you the numbers, /guard menu opens a live list of everyone fighting right now.
Paper, Spigot, Purpur or Folia 1.16 or newer, on Java 17 or newer.
Minecraft 26.1 and 26.2: the server needs Java 25. The GuardAC jar stays the same, nothing to swap.