Tooltipped API
Tooltipped is a lightweight client-side mod that reveals the purpose and functionality of various blocks and items in Minecraft. The base version of the mod is extremely simple, but it can be significantly expanded using other mods and datapacks.
Simply right-click on any block — and an explanation of its capabilities and purpose will appear in the action bar. Items display custom tooltips when you hold them in your hands.
Currently, only a few features are available in the standard configuration, but the system is fully customizable: you can enable, disable, or completely deactivate tooltips for specific blocks and items.
If you want to add your own blocks, items, or features from vanilla gameplay, check out the usage instructions.