Sentinel

Showcase video

YouTube showcase + explanation: https://www.youtube.com/watch?v=nF527eBHEXo

A Hytale server-side anticheat plugin focused on movement/interaction checks with staff alerts, recent flag logs, and optional Discord webhook notifications and punishments.

Current Checks

• Timer: Detects abnormally fast movement and interaction packets.
• Fly: Flags flying in Adventure mode.
• Speed: Flags sustained horizontal movement speed above a threshold.
• Infinite Stamina: Flags sprinting without stamina depletion.

Features

• Staff Alerts in Chat
• Optional Discord Webhook Alerts
• Optional automatic punishments (disconnect/ban) at high flag counts

Configuration

The config file is created in the plugin data directory on first run (typically mods/Al3x_HytaleAC/config.json).

Default config:

{
  "timer": {
    "enabled": true,
    "minMsInteractionPacket": 9,
    "minNanoMovementPacket": 15000000.0,
    "flagsNeededToAlert": 100,
    "flagsNeededToPunish": 1000
  },
  "fly": {
    "enabled": true,
    "flagsNeededToAlert": 1,
    "flagsNeededToPunish": 5
  },
  "speed": {
    "enabled": true,
    "maxSpeedThreshold": 9.5,
    "flagsNeededToAlert": 1,
    "flagsNeededToPunish": 5
  },
  "infStamina": {
    "enabled": true,
    "flagsNeededToAlert": 4,
    "flagsNeededToPunish": 8
  },
  "alerts": {
    "resetIntervalSeconds": 60,
    "notifyReset": true,
    "debugMode": false,
    "discordWebhookUrl": ""
  },
  "punishments": {
    "reason": "[Anticheat] Cheating",
    "shouldBan": false
  }
}

Config options:

Path	Type	Default	Description
timer.enabled	boolean	true	Enables or disables the timer check entirely.
timer.minMsInteractionPacket	int	9	Minimum milliseconds between interaction packets before flagging.
timer.minNanoMovementPacket	number	15000000.0	Minimum average nanoseconds between movement packets before flagging.
timer.flagsNeededToAlert	int	100	Flags required before sending a staff alert (timer).
timer.flagsNeededToPunish	int	1000	Flags required before punishments trigger (timer).
fly.enabled	boolean	true	Enables or disables the fly check entirely.
fly.flagsNeededToAlert	int	1	Flags required before sending a staff alert (fly).
fly.flagsNeededToPunish	int	5	Flags required before punishments trigger (fly).
speed.enabled	boolean	true	Enables or disables the speed check entirely.
speed.maxSpeedThreshold	number	14.0	Maximum horizontal speed before flagging.
speed.flagsNeededToAlert	int	1	Flags required before sending a staff alert (speed).
speed.flagsNeededToPunish	int	5	Flags required before punishments trigger (speed).
infStamina.enabled	boolean	true	Enables or disables the infinite stamina check entirely.
infStamina.flagsNeededToAlert	int	2	Flags required before sending a staff alert (stamina).
infStamina.flagsNeededToPunish	int	4	Flags required before punishments trigger (stamina).
alerts.resetIntervalSeconds	int	60	Interval in seconds to clear player flags.
alerts.notifyReset	boolean	true	If true, notifies staff members when flags are reset.
alerts.debugMode	boolean	false	If true, prints debug output to the server console for different checks. And doesn't execute punishments
alerts.discordWebhookUrl	string	""	Discord webhook URL for alert embeds; leave empty to disable.
punishments.reason	string	"[Anticheat] Cheating"	Reason used for disconnects/bans and punishment webhooks.
punishments.shouldBan	boolean	false	If true, bans instead of disconnecting when punishments trigger.

Webhook alerts

If alerts.discordWebhookUrl is set, staff alerts and punishment actions also post to Discord. Alerts are rate-limited to once per second except for punishments.

Punishments

When any check reaches its flagsNeededToPunish threshold, the plugin will disconnect the player by default and send a punishment webhook. If punishments.shouldBan is true, it will issue an infinite ban instead.

Commands

Command	Description	Permission	Notes
/anticheat reload	Reloads plugin configuration options.	anticheat.command	Note that a server restart is better.
/anticheat help	Shows available anticheat commands.	anticheat.command	N/A
/alerts	Toggles receiving anticheat alerts.	hytaleac.alerts	Players with this permission are auto-enrolled on join.
/logs <player>	Shows recent flags for a player.	hytaleac.logs	Logs are cleared on the reset interval.

Permissions

• anticheat.command: Use /anticheat help and /anticheat reload.
• hytaleac.alerts: Use /alerts and receive staff alerts.
• hytaleac.logs: Use /logs <player>.

Installation

1. Grab the .jar from the latest release.
2. Copy the jar into the Hytale server's mods directory.
3. Start the server to generate config.json in the plugin data directory.

Troubleshooting

• Too many/false flags: increase the relevant check's flagsNeededToAlert or flagsNeededToPunish, and/or relax thresholds (for example timer.minMsInteractionPacket, timer.minNanoMovementPacket, or speed.maxSpeedThreshold).
• No staff alerts: ensure staff have hytaleac.alerts, and that they toggled alerts with /alerts.
• Logs always empty: logs reset on alerts.resetIntervalSeconds, this is to prevent false flags from cluttering logs.
• No Discord alerts: verify alerts.discordWebhookUrl is a valid webhook url.

Performance Notes

Hytale is still new and the server API is evolving. While this plugin has been tested on lower-end hardware, performance can vary based on server load and player count. And may break if a sudden update changes how packets work. Always monitor your server's performance after adding new plugins.