Jester AntiCheat
0.0.5-betaUltimate protection against modern exploits. Jester blocks cheaters instantly while maintaining flawless server performance.
0.0.5-betalatestJester AntiCheat 0.0.5-beta4 weeks ago 0.0.5-beta
A big accuracy and cleanup release on top of 0.0.4. The main goals were fewer false kicks, protection against mace one-shot exploits, the full packet-order check set, and a config that's easier to read.
- TeleportHit check: blocks one-shot mace hits (MaceKill / MaceDMG) and teleport aura. If a hit comes right after a move no real client can make in one packet, the hit is cancelled, so no damage lands. - Packet-order checks restored: PacketOrderA–O are back (15 checks). They catch clients that fake actions and send packets in the wrong order. B and C can kick; the rest are beta and alert only. PacketOrderP ships disabled, same as upstream. - Config versioning: configs now carry a
Newconfig-version. On update, your file is rebuilt with the new layout and keys, your values are kept, and a.bakbackup is saved. Messages that moved between files keep your customised text.
- Low TPS no longer switches checks off: below
False-positive & bug fixesminimum-tpsa check stops completely, and the old default of 19.5 silently switched off 84 checks during normal TPS dips (crash checks included). The default is now 15. BadPackets, Crash and Exploit never pause. - Old clients: players on 1.9–1.21.1 standing still (for example at a mob grinder) no longer false-flag the per-tick checks: NoHitDelay, KillAuraB, AutoClickerB, AutoWeapon, AttributeSwap, TriggerBot and NukerA. - Momentum: camel dash, ice boats leaving ice, and TNT or wind-charge launches no longer flag EntitySpeed, BoatFly or Fly. - Holding right-click: holding right-click with rockets no longer flags FireworkBoost. - Building: drag-click bridging and scaffolding no longer flag AutoClicker, FastPlace or Tower. - AutoFish now detects real fish bites. It used to flag rod PvP instead. - AutoArmor no longer flags taking armor off. - AutoParkour no longer flags walking up hills or vanilla Auto-Jump. - CrystalAura placement detection now works on modern clients. - BoatClip no longer flags after a server teleport or a vehicle change. - Kick-immunity bypass closed: a well-timed lag spike could make a player immune to kicks for the rest of an offense. - Violation decay: time-based decay now applies only to checks that set it. Rare-event checks such as AutoRespawn and AutoTotem can reach their threshold again. - Reach now alerts staff before it kicks. - Spectate:/jester spectateinto another world no longer drops staff into survival.
- `config.yml` and `messages.yml` reorganised: checks are grouped by what they detect, each has a short description, and settings are grouped the same way. - Flag hover tooltip is now editable in
Configuration & tuningmessages.yml(alert-hover). - All messages now live inmessages.yml. -toggle-alerts-on-joinnow works.
- No need to delete your config. It migrates automatically on first start, and backups are saved as
Notesconfig.yml.bak/messages.yml.bak. - Requires PacketEvents.0.0.4-betaJester AntiCheat 0.0.4-betaJul 4, 2026 0.0.4-beta
A large stability, accuracy and configurability pass on top of 0.0.3 — mostly killing false positives, hardening detections, and exposing every setting. Two new checks added.
- GhostBlock check — flags placing a block against a position that is air server-side (the ghost-block region exploit). - GhostItem check — flags using an item the server doesn't see in the player's hand (inventory desync / fake item). - Global high-ping guard — above a configurable ping, movement/combat checks alert but don't kick; packet-integrity checks (BadPackets/Crash/Exploit) still enforce. Judged on live ping, so a lag-switch can't buy kick-immunity. - AFK via WorldGuard flag — mark no-AFK zones natively: New/rg flag <region> jester-afk-blocked allow(region list removed).
- Throwing egg / snowball / ender pearl / splash & lingering potion / xp bottle / fishing rod no longer leaves a stuck "using item" state that false-flagged NoSlow & Multitask. - Criticals no longer false-flags players attacking while riding a horse/boat. - NoSlow loosened + much faster violation decay — stops false kicks on high-ping players. - ReachB hardened: pose-aware eye height (swimming/elytra were ~1 block off), riders skipped, absurd high-ping distances ignored, shield/knockback grace, evidence not wiped by skipped hits. - KillAuraC now needs a streak of attacks-while-GUI-open (fixes a container open/close race). - TriggerBot now uses real ray-box hitbox intersection instead of a fixed sphere — correct for every mob size (cow/horse/etc.). - Phase no longer false-kicks when standing on a shulker box as it opens (still catches real phasing). - AutoParkour division-by-zero / bitmask-overflow guard on False-positive & bug fixeswindow-size. - Rebalanced the FP-prone rate checks (AutoClicker, FastBreak, FastPlace, AutoArmor, Multitask) so butterfly/drag clicking, fast bridging and quick armor swaps don't trip them.
- Every check is now visible & configurable in Configuration & tuningconfig.yml— added blocks for ~100 previously-hidden checks. - ~60 orphaned settings exposed that the code read but the config never listed: violation history/database (SQLite/MySQL), ghost-block/exploit options, Knockback & Reach tuning, ChestStealer/AutoBlock/AutoPot/Explosion, and an Advanced section (high-ping API limits, packet-spam threshold, item-usage resets, etc.). - 11 command-response messages (freeze / tp / cps / kb / setback / rotate / stats / clearviolations) added tomessages.ymlso they're customizable. - Packet-integrity checks (BadPackets / Crash / Exploit) now enforce (kick) with commands. - AFK settings merged intoconfig.ymlunderafk:(separate afk.yml removed). -Reachmax-violations set to 3;KillAuraBmin-targets,KillAuraC/GhostBlock/GhostItemmin-consecutive, andReachextra-reachare now configurable.
- Back up your config and let it regenerate after updating — many keys were added/renamed. - Requires PacketEvents. Notes0.0.3-betaJester AntiCheat 0.0.3-betaJun 29, 2026 0.0.3-beta
- Phase no longer false-kicks on shulker boxes. Opening a shulker box you're standing on used to trigger a Phase setback/kick — the lid's collision change is now exempt. - ReachB no longer false-flags during knockback. Taking damage (e.g. while holding a shield) briefly desyncs your position; reach hits within a short knockback window are now ignored. - Removed an experimental aim check that could false-flag legitimate players. Fixes
- Reach allowance is now configurable — ChangesReach.extra-reach(default0.3, i.e. ~3.3-block limit). - ReachB flags now display asReachB(instead ofReach), so the two reach checks are easy to tell apart. - Plugin-compatibility toggles underintegrations:are now actually honoured (GSit, WorldGuard, AuraSkills, ItemsAdder, DeluxeCombat). - Wider server support: runs on the same range as the Grim engine (api-version 1.13).
- Several config keys were renamed for clarity — back up and let the config regenerate after updating. - Requires PacketEvents. Notes
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