Knockable

Knocking a block plays a knocking sound. Which block is targeted decides the effect: blocks with an inventory open a short interaction, while blocks without one only make the sound. The pitch of the sound follows how many item slots are empty in the container, and it also shifts with the distance to the targeted block, so a near knock sounds different from a far one.

Knockable blocks are defined through a new knockable:knockable block tag. Doors are included by default, and the trapdoor, chest and barrel block tags are included as well, so other blocks can be added by datapack. The knockingRange game rule sets the maximum distance at which a knock counts as valid, which lets server owners limit how far a player can knock. The mod is a lightweight Fabric mod and requires nothing beyond the loader.

Files are published for Fabric only, for 1.20.1 and 1.21.1, with 0.0.2-1.21.1 for 1.21.1 as the latest file. Knockable runs on client and server, so both the server and every player need it. The code is open source under the GNU General Public License v3.0 or later.