Command

The arc:command reward type executes a server command.

Parameters

Parameter	Type	Required	Default	Description
command	string	✅Required	-No default value	The command to execute.

Placeholders

The command string can include placeholders that will be replaced with dynamic values from the action data:

• %player%: The player's name.
• %uuid%: The player's UUID.
• %world%: The resource location of the player's current world/dimension.
• %player_location%: The player's block coordinates (e.g., 100 64 -250).
• %block_location%: The coordinates of the block from the action data.
• %item%: The resource location of the item from the action data.
• %item_stack%: The resource location of the item from the item stack in the action data.

Example

The following example will say "Hello, world!" in chat whenever the player joins the game.

data/my_datapack/arc/hello_world_on_join.json

{
    "holder": {
        "type": "arc:player",
        "id": "arc:player"
    },
    "type": "arc:on_advancement",
    "conditions": [
        {
            "type": "arc:advancement",
            "advancement": "minecraft:story/root"
        }
    ],
    "rewards": [
        {
            "type": "arc:command",
            "command": "say Hello, world! Welcome, %player%!"
        }
    ]
}

## Compatible Action Types

<CompatibleActionTypes />