Sinew
Sinew is a NeoForge library for 1.21.1 that other mods build on, providing shared utilities for animation, entity navigation and block tags.
What it does
Sinew supplies general utilities that mod authors can call from their own code, grouped as a library rather than a gameplay mod. Its animation support blends between poses using the vanilla keyframe system, so animated entities can move from one state to another without abrupt jumps. Entity navigation is smoother as well, which affects how mobs path across the world once Sinew is loaded.
Sinew also adds tags that other content can read. Mob tags control when certain mobs appear, including a configurable rule that keeps them from spawning until the Nether has been entered before the Ender Dragon is defeated. Block tags mark blocks that shears harvest faster, and a mob tag exempts creatures from sweet berry bush damage. Opposing Force requires Sinew, so it is the mod that depends on these utilities.
The library is released under the MIT License and is open source, with its source code and issue tracker public. Only the 1.21.1 NeoForge build is published, dated 2026-10-14 for version 1.3.0, after a first release on 2026-09-07.
Key features
Keyframe animation blending
Animation states interpolate between poses using the vanilla keyframe system, giving smoother transitions for animated entities.
Smoother entity navigation
Mobs path across terrain with smoother movement, which helps any mod that relies on entity pathfinding.
Configurable mob spawn tag
A mob tag keeps certain mobs from spawning until the Nether has been entered before the Ender Dragon is defeated, and the rule can be configured.
Faster shears harvesting
A block tag marks blocks that shears harvest more quickly, so those blocks break faster when shears are used.
Sweet berry bush immunity
A mob tag makes the listed creatures immune to sweet berry bush damage.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Required by 1 mod
Use cases
Mod authors
Developers who build NeoForge content for 1.21.1 can call Sinew's animation, navigation and tag utilities instead of writing their own.
Who it’s for: Sinew is aimed at mod developers and at modpack builders who run mods that depend on it. Players who only install Opposing Force still need Sinew present for that mod to start.
Questions
Which loader does Sinew support?
Does Sinew need to be installed on a server?
Which mod requires Sinew?
In the catalog
Sinew is one of 3,514 Library mods on ModsFinder, and one of 1,449 Library mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
More from platypushasnohat
Similar mods
What the author says
Sinew is a library mod with various utilities and features meant for mods I work on. Features: - Smooth animation states for lerping between animations using the vanilla keyframe system - Smoother entity navigation - Tags for mobs that should only spawn once the nether has been entered before or the ender dragon has…
Official listing
- Modrinth page
- modrinth.com/mod/sinew
- Owner
- platypushasnohat
- Published
- 2026-09-07
- Updated on Modrinth
- 2026-10-14
- Facts verified
- 2026-10-15