Circuit Core
by AussieBox
Circuit Core is a Fabric library that AussieBox's own mods use for shared utility methods on both the client and the server.
What it does
The library supplies helper code that many of AussieBox's projects depend on. Its utilities cover item and block registration, an ItemGroup registry, and advancement granting and revoking, so a mod built on it does not need to write that code itself. It also wraps PlayerAnimationLib, which is bundled inside the mod, for playing player animations.
Player-exclusive items are another part of the library. A world operator can restrict an item so that only specific players may use it, and a default list of players can be set during registration. Devenv-exclusive utilities are included for development environments. The mod declares its own version so dependent mods can check it. Mods that need it must list Circuit Core as a dependency in their metadata.
Circuit Core is published for Fabric only, with builds covering four release versions: 1.21.1, 1.21.8, 1.21.10 and 1.21.11. The latest file, 0.4.3-1.21.11, targets 1.21.11 and dates from 2026-08-22. It runs on client and server, so both sides need it. The code is released under All rights reserved, not as open source, though public source code and an issue tracker are linked.
Key features
Shared utility methods
Client and server helper methods that other AussieBox mods call instead of carrying their own copies.
Automatic item registration
Registered items, blocks and ItemGroups are added to the game through the library's registry utility.
Advancement utilities
Helpers grant and revoke advancements, so dependent mods can track progress in a consistent way.
Player-exclusive items
Items can be limited to chosen players, with the list set at registration and adjusted by world operators.
Bundled animation library
PlayerAnimationLib ships inside the mod, and Circuit Core wraps it for animations on players.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Embedded 1
How it compares
Lamp's Utils is a Fabric library for 1.21.9 – 1.21.11 with the same client and server environment, released under the CC0 1.0 Universal license and open source. Dalib is a Fabric library for 1.21.11 only, released under the MIT License and open source; it is required on the client, with the server optional. Circuit Core instead has a longer build history, and it is not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Circuit Core | Fabric | 1.21.1 – 1.21.11 | Client and server | 2026-08-22 |
| Lamp's Utils | Fabric | 1.21.9 – 1.21.11 | Client and server | 2026-05-15 |
| Dalib | Fabric | 1.21.11 | Client required, server optional | 2026-07-22 |
Questions
Does a mod using Circuit Core need the library on the server?
Which game versions does Circuit Core support?
In the catalog
Circuit Core is one of 3,514 Library mods on ModsFinder, and one of 2,348 Library mods for Fabric. 19,862 mods support Minecraft 1.21.11.
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What the author says
Circuit Core is a mod used by most of AussieBox's projects that supplies utility methods for Client & Server-sided mods. Currently, it provides: - A PlayerAnimationLib wrapper (is that what you call it?) - Item, Block, and ItemGroup registry util - Also adds registered items to ItemGroups automatically! - Advancement…
Official listing
- Modrinth page
- modrinth.com/mod/circuit-core
- Owner
- AussieBox
- Published
- 2026-06-20
- Updated on Modrinth
- 2026-08-22
- Facts verified
- 2026-10-15