Exclusions Lib

Exclusions Lib targets datapack work with vanilla JSON files. A new block predicate, exclusions lib:overlaps, takes a block position with an optional offset, as most other predicates do, and reports whether a structure or a range of blocks overlaps that position. The structures field limits the check to listed structures, while the range value, up to 32, sets the area checked around the position.

The tag system adds a blacklist field. A tag can then contain everything in a base tag, such as minecraft:small_flowers, except named entries like wither roses. Setting the excluded field to true on an added entry removes it while keeping the item in the shared tag, so other mods' tag entries still work. Its author notes that it can clean up edge-case items that other mods add.

Exclusions Lib runs on the server side only, so players join without installing it. It is published for Fabric and Forge, and NeoForge has a separate build. Files cover 1.20.1, 1.21.1 and 1.21.6, and the code is released under Creative Commons Attribution 4.0, which is not open source.