Vanilla FTB Chunks tells the intruder they can't break a block. This tells you, the claim owner, that someone tried.
When a non-team player tries to break, place, or interact inside your FTB Chunks claim and the action is blocked, every online team member gets a one-line chat alert:
⚠ Alex tried to break a block at (210, 64, -88) in minecraft:overworld.Otherwise you'd only find out by digging through the log file later — or when a chunk goes missing. FTB-Mods-Issues #257 asked for exactly this; the FTB maintainer marked it "no longer planned for FTB," so this is a small drop-in that adds the missing notification.
It listens to vanilla BlockEvent.BreakEvent and PlayerInteractEvent.RightClickBlock at HIGHEST priority and, when one is canceled, asks FTB Chunks' public API whether the position is a claim owned by someone other than the actor. There's a 5-minute cooldown per intruder-and-claim so it doesn't spam, no mixin (it uses FTBChunksAPI), and it silently no-ops if FTB Chunks' API shifts in an update. The only state is an in-memory cooldown map, cleared on server stop.
Dependencies
Server-side only — clients don't need it.
Free to use in any modpack. Source and issues: https://github.com/KURONAMI333/claim-intrusion-alert
