ModsFinder

Movement&Security Client mod

by SummerPlays

Movement&Security Client mod is a Fabric client mod that reports the client's installed mods and chat activity to a paired server-side plugin.

FabricClient-side onlyAll rights reserved1.21 – 1.21.11

What it does

On joining a server, the client scans the Fabric Loader environment and builds a complete list of installed mods with their names and IDs, which the server can cross-reference against a database of known cheat mods such as Wurst and Meteor X-Ray. The server can also limit play to an approved set of mods. Because the report lists the files actually loaded in memory, it does not depend on the server guessing from player behavior or packets.

The mod hooks the chat send method of the game's client network handler. Each message a player sends produces a parallel ChatReport packet to the server, carrying the raw text as typed, so messages that auto-text macros or filters might alter still reach the server in their original form. Chat commands are verified in the same way. A custom network channel named movement:security handles the handshake, and a server plugin can detect players who join without sending security payloads, with kick and ban automation to follow.

The mod requires Fabric API. It is published for Fabric only, across 12 release versions 1.21 – 1.21.11, with 1.0.4 for 1.21.11 as the latest file, and the code is not open source under an All rights reserved license.

Key features

  1. Installed mod enumeration

    On join, the client sends the names and IDs of every mod in its Fabric Loader environment to the server.

  2. Cheat client detection

    The server compares the reported mod list with its stored records of cheat mods.

  3. Mod whitelist enforcement

    The server can allow only a configured set of approved mods to be installed during play.

  4. Raw chat reporting

    Each sent chat message is mirrored to the server as a ChatReport packet with the original text.

  5. Chat command verification

    Chat commands are reported as typed, which helps show whether a command came from the player or from an injected script.

  6. Presence handshake

    A custom channel lets the server confirm the client is present and detect players who never send security payloads.

Compatibility

Latest build for each game version and loader.

1.21.x12 of 12 versions with builds
1.21.111.0.4
1.21.101.0.4
1.21.91.0.4
1.21.81.0.4
1.21.71.0.4
1.21.61.0.4
1.21.51.0.4
1.21.41.0.4
1.21.31.0.4
1.21.21.0.4
1.21.11.0.4
1.211.0.4
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

How it compares

Full comparison

SentinelClient is a Fabric mod for 1.21.8 – 1.21.9 that is server required with the client optional, and it is not open source under the MIT License. Poime's Mod Checker is a Fabric mod for 1.21.4 with a client and server environment, released under the MIT License as open source. StreamerConfigs is a client-side only Fabric mod for 1.21.11 under the GNU General Public License v3.0 or later.

ModLoadersGame versionsEnvironmentUpdated
Movement&Security Client modFabric1.21 – 1.21.11Client-side only2026-01-17
SentinelClientFabric1.21.8 – 1.21.9Server required, client optional2026-01-16
Poime's Mod CheckerFabric1.21.4Client and server2025-05-26
StreamerConfigsFabric1.21.11Client-side only2026-08-28

Questions

Does Movement&Security Client mod need Fabric API?

Yes. Fabric API is required and must be installed alongside the mod on Fabric.

Does a server need the paired plugin for the mod to work?

The mod reports to a Minecraft server paired with the corresponding server-side plugin, so the plugin is needed for the checks to take effect.

Which game versions does the mod support?

Files exist for 12 release versions 1.21 – 1.21.11, and the latest file is 1.0.4 for 1.21.11.

In the catalog

Movement&Security Client mod is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.

Management mods8,016Fabric modsMods for 1.21.1119,862

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What the author says

MOVEMENT SECURITY CLIENT MOD - SECURITY BENEFITS OVERVIEW This document explains how the Movement Security Client Mod enhances the security of your Minecraft server when paired with the corresponding server-side plugin. The mod acts as a trusted agent running on the player's computer, providing information that the…
SummerPlays, on the Modrinth page

Official listing

Owner
SummerPlays
Published
2026-01-17
Updated on Modrinth
2026-01-17
Facts verified
2026-10-15

Tags

Management
Open on ModrinthCompare