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Firmament Mod Announce Remover

by Microcontrollers

Firmament Mod Announce Remover switches off the mod announcement feature built into Firmament, a Hypixel SkyBlock companion mod.

FabricClient-side onlyCC0 1.0 UniversalOpen source1.21.5 – 1.21.11

What it does

The mod disables the ModAnnouncer feature in Firmament, which sends a list of installed mods to the server. It is a Fabric mod that runs on the client alone, so only the client needs it and the server never sees it. Firmament for Hypixel SkyBlock is an optional dependency, and the mod changes nothing when that mod is absent.

The author explains the change as a response to a packet problem. The announcement packet had been too large, which made the server handle the message badly and force a client disconnect. An earlier fix addressed log spam from painting item rendering, and the author regards the announcement as a privacy concern, since the list lets a server fingerprint users. Working from the original Forge handshake, the author also argues that a server could ban users by mod ID, and that the list is not a useful way to detect cheating.

Files cover 1.21.5 – 1.21.11, with 1.3.0 for 1.21.11 as the latest Fabric build, released 2026-03-20. The first release came out on 2025-09-06. The license is CC0 1.0 Universal, which makes the project open source, and its source code and issue tracker are public.

Key features

  1. Disables mod announcements

    Turns off the feature that reports the installed mod list to a server during the connection.

  2. Client-only operation

    Runs on the player's side only, so it can be added to an existing Firmament setup without server changes.

  3. Fixes an oversized packet

    Removes the announcement packet that was too large and caused a forced disconnect on the server.

  4. Log spam fix

    Earlier builds stopped repeated log messages when a painting item is rendered.

Compatibility

Latest build for each game version and loader.

1.21.111.3.0
1.21.101.3.0
1.21.91.0.1
1.21.81.1.0
1.21.71.0.1
1.21.61.0.1
1.21.51.0.1
ReleaseBetaAlphaNot available

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

Requirements

Dependencies declared by the latest file for each loader.

Optional 1

Firmament for Hypixel SkyBlockA Hypixel SkyBlock 1.21 QOL mod inspired by NEU.
Optional

Use cases

Keeping the mod list private

A player who does not want their installed mods sent to the server can remove the announcement while still using Firmament.

Playing Hypixel SkyBlock without the announcement

With Firmament installed, this mod stops the feature from running in SkyBlock sessions.

Who it’s for: Players who use Firmament on Hypixel SkyBlock and want the mod list kept off the server. Server owners do not need it.

Questions

Does Firmament Mod Announce Remover need Firmament?

No. Firmament for Hypixel SkyBlock is listed as an optional dependency, so the mod can be installed without it, though it only affects Firmament.

Does the server need this mod?

No. Servers do not need it; each player installs it for their own game.

Which game versions does the mod support?

Builds are published for 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10 and 1.21.11, with 1.3.0 as the latest Fabric file for 1.21.11.

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What the author says

Disables Firmament's Mod Announcer feature, which sends the server a list of every mod you are using. Previously also fixed log spam whenever a painting item gets rendered. This mod was originally created as the initial implementation of Firm's packet could lead to sending a packet too large for the server to handle…
Microcontrollers, on the Modrinth page

Official listing

Owner
Microcontrollers
Published
2025-09-06
Updated on Modrinth
2026-03-20
Facts verified
2026-10-15
Open on ModrinthCompare