AntiFly

Lightweight Paper + Fabric flight-control plugin by CevAPI.

AntiFly is not a full anti-cheat. It focuses on flight and movement abuse with layered checks:

• server-authorized flight state
• server-side ground/support truth
• buffered air/hover/anti-kick suspicion
• disciplined setbacks to last known valid support
• Elytra-specific movement and boost sanity checks

Platforms

• Paper: 1.21.x -> 26.1.2
• Fabric: 1.21.11 -> 26.1.2 (Fabric Loader 0.18.1+, Fabric API 0.141.1+1.21.11)

Commands

Paper

Requires op or antifly.admin.

Core:

• /antifly enable
• /antifly disable
• /antifly status
• /antifly help
• /antifly exempt <player>
• /antifly unexempt <player>
• /antifly set
• /antifly set <key>
• /antifly set <key> <value>
• /antifly reset <player>

Alerts:

• /antifly alerts <off|game|console|both>
• game alerts go to ops and users with antifly.alerts

Debug:

• /antifly debug on
• /antifly debug off
• /antifly debug
• Shows live action-bar telemetry (mode, speed vs limits, key buffers)

Fabric

Requires moderator-level command permission.

• /antifly command family is available with equivalent core controls.

Primary settings keys (Paper)

• groundWalkMax
• groundMountedMax
• waterMax
• waterVerticalMax
• maxAirHorizontal
• maxAirVertical
• bufferDecay
• horizontalBufferLimit
• verticalBufferLimit
• hoverBufferLimit
• noFallDetectionEnabled
• airNonFallTicksLimit
• antiKickWindowTicks
• antiKickMinDescent
• setbackCooldownMs
• elytraEnabled
• elytraBoostGraceTicks
• elytraStallTicks
• elytraMovementBufferLimit
• elytraDurabilityCheckEnabled
• elytraMaxRocketHorizontal
• elytraMaxRocketUp
• elytraNoRocketSustainableHorizontal
• elytraMaxNoRocketUp

Legacy aliases kept for backward compatibility:

• groundSpeed, groundSpeedWalking, groundSpeedMounted
• waterSpeed, waterVertical
• airSpeed, airVertical, airNonFallTicks
• elytraMovementLimit

Notes on Elytra

• Rocket-assisted glide is tracked separately from no-rocket glide.
• No-rocket controlled upward/flat cruise behavior is treated as suspicious and can be blocked.
• Rare fluid-exit and early-glide pull-up transitions are given short grace windows to reduce false positives.

Permissions (Paper)

• antifly.admin (default: op)
• antifly.alerts (default: op)

Config locations

• Paper: plugins/AntiFly/config.yml
• Fabric: config/antifly.json