Is sneaking
Whether a player is holding sneak (crouching) right now.
A Minecraft element (a check) in Players. Needs the Basic plan or higher to go live; building and testing are free.
Example
When a player right-clicks → If Is sneaking → Open a menu: Settings.
Also called
sneaking, crouching, shift, sneak
Works as a data pack?
Yes. A vanilla data pack does this exactly as the plugin does.
What you give it
- Player