Check Catalog

Every check has a stable ID, a fixed evidence class (how strong its proof is: ANOMALY < HEURISTIC < PROTOCOL_INVALID < SERVER_IMPOSSIBLE), and a default state. Experimental checks are always alert-only and disabled by default — enabling one in production is a deliberate opt-in, not a recommendation.

Economy and inventory — 6 checks, all enabled

Check	Evidence class	Purpose
`economy.item_gain_rate.a`	ANOMALY	Soft per-material gain-rate anomaly (notify only)
`economy.item_gain_rate.b`	HEURISTIC	Hard per-material gain-rate ceiling
`inventory.reconciliation.a`	HEURISTIC	Unexplained inventory balance delta after settlement
`inventory.illegal_stack.a`	SERVER_IMPOSSIBLE	Stack size exceeding what the item allows
`inventory.illegal_item.a`	SERVER_IMPOSSIBLE	Denylisted material (command blocks, barriers, etc.) in a player's inventory
`inventory.transaction_burst.a`	HEURISTIC	Abnormal inventory-transaction rate

Movement — 8 checks (4 enabled, 4 experimental)

Check	Evidence class	Default	Purpose
`movement.speed.a`	ANOMALY	enabled	Excess horizontal speed beyond a mechanics-aware envelope
`movement.flight.a`	HEURISTIC	enabled	Sustained unsupported airborne movement
`movement.nofall.a`	HEURISTIC	enabled	Fall distance/damage sequence inconsistency
`movement.timer.a`	HEURISTIC	enabled¹	Movement packet rate inconsistent with server time
`movement.step.a`	ANOMALY	experimental	Invalid instant upward step
`movement.phase.a`	SERVER_IMPOSSIBLE	experimental	Movement through solid collision
`movement.waterwalk.a`	ANOMALY	experimental	Invalid sustained support over fluid
`movement.elytra.a`	ANOMALY	experimental	Impossible elytra acceleration

Combat — 9 checks (4 enabled, 5 experimental)

Player-vs-player only — see Known Limitations.

Check	Evidence class	Default	Purpose
`combat.reach.a`	ANOMALY	enabled	Attack distance beyond a latency-compensated envelope, measured to the closest point on the target's real hitbox
`combat.attack_rate.a`	HEURISTIC	enabled	Sustained attack rate beyond a conservative ceiling
`combat.multitarget.a`	HEURISTIC	enabled	Two distinct targets hit from opposite directions within a short interval
`combat.bad_order.a`	PROTOCOL_INVALID	enabled	Attack landed with no preceding arm-swing animation
`combat.rotation.a`	HEURISTIC	experimental	Repeated instant snap-onto-target rotation
`combat.autoclicker.a`	HEURISTIC	experimental	Unusually regular click-timing statistics
`combat.velocity.a`	ANOMALY	experimental	Horizontal movement far below the server's own applied knockback ("anti-knockback"/no-KB)
`combat.totem_swap.a`	ANOMALY	experimental	Totem re-equipped into the offhand implausibly soon after the previous one popped ("auto-totem" macro)
`combat.line_of_sight.a`	ANOMALY	experimental	Attack landed with no clear line of sight to the target (hit through a wall)

World and interaction — 8 checks (5 enabled, 3 experimental)

Check	Evidence class	Default	Purpose
`world.fastbreak.a`	SERVER_IMPOSSIBLE	enabled	Block broken faster than the server's own computed minimum
`world.nuker.a`	HEURISTIC	enabled	Sustained multi-block break rate
`world.fastplace.a`	HEURISTIC	enabled	Sustained block-placement rate
`world.interaction_reach.a`	ANOMALY	enabled	Block break beyond a conservative reach envelope
`world.impossible_action.a`	SERVER_IMPOSSIBLE	enabled	Block placement beyond a hard, non-latency-adjustable ceiling
`world.scaffold.a`	HEURISTIC	experimental	Bridging while looking straight down and moving
`world.pearl_clip.a`	ANOMALY	experimental	Ender pearl teleport left the player embedded in solid block geometry ("wall clip" glitch)
`world.tnt_prime_rate.a`	HEURISTIC	experimental	Implausible rate of directly player-triggered TNT priming (server-load protection, not a cheat signature - cannons are legitimate)

Packet/protocol — 4 checks (3 enabled, 1 experimental)

Check	Evidence class	Default	Purpose
`packet.rate.a`	HEURISTIC	enabled¹	Combat/interaction packet flood
`packet.sequence.a`	PROTOCOL_INVALID	enabled¹	Attack packet targeting an entity ID the server never disclosed
`packet.payload.a`	SERVER_IMPOSSIBLE	enabled	NaN/infinite movement coordinates (the one check with a real, working cancel)
`packet.inventory_state.a`	HEURISTIC	experimental	Inventory click Bukkit itself cannot classify

¹ Requires the optional PacketEvents plugin (see Getting Started); registers but stays inert with no error if it's absent.