How to Configure an Anticheat Plugin to Reduce False Positives

Every anticheat plugin produces false positives. The goal is not zero, which would mean switching detection off, but a rate your staff can review without burning out and that never results in an honest player getting banned automatically. This guide covers the configuration habits that get you there.

Why false positives happen

Anticheat infers cheating from behaviour the server observes, and that data is noisy. The usual causes are:

Network conditions. Ping spikes and packet loss make movement arrive late or in bursts, which looks like speed or teleporting. Lag is a topic of its own: compare patterns before you blame the player.
Server lag. A low TPS distorts timing for everyone.
Legitimate movement quirks. Ice, honey, bubble columns, elytra, riptide tridents, knockback, vehicles and potion effects.
Other plugins. Custom enchants, knockback tweaks, teleport tools and movement abilities change what is normal for your server.
Different client versions. Players joining through version-translation layers may behave slightly differently from native clients.

Step 1: Establish a baseline

Before changing anything, run the plugin in alert-only mode for a few days. Record which checks fire most and for whom. Often two or three checks create most of the noise. Fixing those has a bigger effect than tweaking everything.

Keep a simple log: check name, player, what they were doing, whether staff judged it legitimate. This turns tuning from guesswork into evidence.

Step 2: Tune per check, not globally

Raise thresholds on noisy checks instead of disabling them. A higher violation level required before alerting keeps the check useful while filtering one-off glitches.
Separate alerting from punishing. A good setup alerts early, notifies staff at a medium level, and only takes automatic action at a very high level or never.
Reset or decay violations over time so that a flag from yesterday does not combine with one from today.
Change one thing at a time and note the date, so you can tell what helped.

Step 3: Handle lag and ping explicitly

Look for settings that pause or relax checks when TPS drops or when a player's ping or packet loss is high. This protects honest players on bad connections. The trade-off is real: a cheater can fake lag. That is another reason alerts under lag should go to a human instead of triggering a ban.

Step 4: Add exemptions carefully

Exemptions are useful for specific situations: a minigame world with custom movement, an event area, a rank that is allowed to fly. Scope them as narrowly as you can, by world, region or time window. Blanket exemptions for entire groups of players are a classic hole, and staff accounts used for testing are often forgotten and left exempt.

Step 5: Build a review flow

Configuration only gets you part of the way. The rest is process.

Triage. One alert is a hint. Repeated alerts across different checks, sessions and days are a pattern.
Look at context. Ping, TPS, what the player was doing, and whether others were flagged at the same moment (a sign of server lag, not cheating).
Observe. Spectate the player or review any recording you have, as covered in how to detect cheaters on a Minecraft server.
Verify before punishing. Use a screenshare or an automated scan to get evidence from the player's computer. Kara Detector, for example, produces a readable report in the staff panel, but like any tool it is a decision aid, false positives are possible, and the final call belongs to staff.
Record the outcome. Feed confirmed false positives back into your tuning log.

A useful habit is a monthly review: pull the list of confirmed false positives, group them by check, and adjust only the top offender. Small, documented steps beat a big reconfiguration that nobody can explain later. Also remember to re-test after every Minecraft or plugin update, because movement and combat behaviour can shift slightly between versions.

Warning signs your setup is off

Staff stop reading alerts because there are too many.
The same trusted players are flagged repeatedly.
Alerts spike right after a plugin or Minecraft update, which often means a check needs retuning or the plugin needs updating.
Appeals show your evidence consisted only of an alert. Fix that before it costs you players; the ban appeal checklist explains what a defensible case looks like.

Next step

Alerts tell you where to look; verification tells you what is true. See how a Kara check works and compare Kara Detector plans if you want evidence from the player's PC before you act.