A basic library mod for datapack creators. This does nothing on its own!
To create your own datapack simply download the included template file for easy access to all of the features.
As of the latest version this library includes the following features:
Predicates
Sneaking
If the targeted player is pressing the crouch key, lib:sneaking will be true
Wand
If the player is holding a wooden axe and is in creative mode, lib:can_wield_wand will be true
Callbacks
On join
When a player joins the world or server, functions in the #lib:on_join tag will be called as the player that joined
On first join
When a player joins the world or server for the first time, functions in the #lib:on_first_join tag will be called as the player that joined
Functions
Raycasting
To start a raycast, run the lib:raycast function as the entity from which to cast the ray with the following arguments:
| Argument | Data type | Description |
|---|---|---|
max_distance |
int | A positive integer representing the max distance in tenths of a block |
anchor |
eyes | feet |
How to anchor the raycast |
callback |
string | The callback function |
Example:
/execute as @p run function lib:raycast {"max_distance":200,"anchor":"eyes","callback":"example:raycast_callback"}
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.19.4, 1.20, 1.20.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — see the MC Java Mods guides for the full walkthrough.
- Downloads as lib.zip
- Download size: 5 KB
- Download link checked 10 Sept 2026 — working
These come from our own check of the pack file, not from the source page.