Fiw AntiCheat

Fiw AntiCheat

Professional mod verification, modpack enforcement, and admin investigation tools for Minecraft servers.

Fiw AntiCheat helps server owners deal with unwanted client mods without guessing what players are running. On join, the server challenges the client companion mod, records the reported mod list, checks it against configurable rules, and gives admins readable tools for enforcement, rollout, and investigation.

This is built for real server administration: blacklist known unfair mods, audit suspicious resource packs, enforce an official modpack with a whitelist, monitor detections before kicking, and keep per-player profiles so staff can see what changed over time.

Why Fiw AntiCheat?

Most anti-cheat setups focus only on movement or combat behavior. Fiw AntiCheat focuses on client mod visibility and modpack integrity:

• Detect common unfair mod categories such as cheat clients, x-ray, fullbright, freecam, autoclickers, and schematic printers
• Audit active and inactive resource packs, including x-ray/fullbright packs left installed under common names
• Enforce an official modpack list for private SMPs, events, staff servers, and modded communities
• Keep readable player profiles with noisy loader/API entries separated from real installed mods and resource packs
• Let admins roll out rules safely with monitor-only mode before kicking players
• Work across Fabric, Forge, and NeoForge targets with one shared rule engine

Fiw AntiCheat is an admin enforcement tool and mod verification layer. It is not magic and does not claim to be cheat-proof: a malicious custom client can lie. It is designed to make honest clients enforceable, catch common unwanted mods, and give staff practical visibility.

Supported Targets

| Loader | Minecraft | Status | |---|---|---| | Fabric | 1.21.1 | Active | | NeoForge | 1.21.1 | Active | | Fabric | 1.21.11 | Active | | NeoForge | 1.21.11 | Active | | Fabric | 1.20.1 | Active | | MinecraftForge | 1.20.1 | Active |

NeoForge does not publish a real Minecraft 1.20.1 artifact on the current NeoForge Maven, so the 1.20.1 Forge-family build targets MinecraftForge 47.x.

There is no Minecraft 1.21.8 build. Use the same Fiw AntiCheat version on the server and on players' clients.

Features

• Blacklist mode - allow normal mods while blocking selected unfair categories
• Whitelist mode - enforce a captured official modpack list
• Built-in signature database - detects known unfair mods by id and stable package markers
• Admin profiles - view each player's current mods, platform/loader entries, and recent changes
• Resource pack auditing - log active and inactive packs, plus added/enabled/disabled/removed history
• Optional resource pack bans - flag by exact pack id/name or SHA-256 fingerprint, with kicks disabled by default
• Readable grouping - Fabric, Forge, NeoForge, API, and loader noise is separated from player-installed mods
• Monitor-only rollout - log and alert staff without kicking while tuning your rules
• Staff alerts - online operators can see detections as they happen
• Bypass list - exempt trusted accounts or test users by name or UUID
• Tiered exemptions - grant bypass, silent, monitor, quiet_kick, a

pinned preset, or force_block per player, with optional expiry and admin-defined auto-escalation rules after repeated detections

• Floodgate/Geyser support - optional Bedrock-player exemption when Floodgate is present
• Hot reload - re-read config/fiw-mods-api/config.json and bundled signatures from the installed jar; external signature files are not loaded
• Server snapshots - capture the server or an online player as the official whitelist baseline

Commands

All commands require permission level 4.

| Command | Does | |---|---| | /fiwmods reload | Reload config and bundled signatures | | /fiwmods snapshot server | Capture the server's loaded mods into the whitelist | | /fiwmods snapshot player <name> | Capture an online player's reported mods into the whitelist | | /fiwmods recheck player <name> / recheck all | Re-run the mod check on online players without freezing them | | /fiwmods profile <name> | Show grouped current mods, resource packs, and recent profile history | | /fiwmods exempt add <player> <tier> [hours] [preset] | Grant an exemption tier, optionally with an expiry and a preset name | | /fiwmods exempt remove <player> | Remove any exemption for a player | | /fiwmods exempt list | List all active exemptions |

Configuration

The config is generated at:

config/fiw-mods-api/config.json

The internal config folder keeps the original id for compatibility, even though the public mod name is Fiw AntiCheat.

Main options: