Dynamic Outlines

Dynamic Outlines highlights blocks and entities with colored outlines, and the color depends on what the player is holding. A block that can be used with the current item gets a yellow outline, and a block that cannot gets a black one. Mobs are outlined in black when passive or neutral and in red when hostile. Interactions are context-aware, so doors, trapdoors, crafting tables and similar blocks are marked for the held item, and entity interactions such as feeding, shearing or leashing are covered too.

The outline system can be tuned with a separate setting for block and entity outlines, including line width, transparency and whether a missing tool produces a stroke. The mod is built on Fabric and is released under the CC0 1.0 Universal license, which makes it open source. Installation needs Fabric Loader and Fabric API. Cloth Config API or YetAnotherConfigLib can be added for in-game configuration, with Mod Menu recommended. Dynamic Outlines runs on the client alone, so vanilla servers work without it.