Load Events
import stdlib
from stdlib import event
def on_load():
text.tellraw("@a", text.colored("Ready", "green"))
stdlib.addEventListener(event.LOAD, on_load)
Minecraft Java Edition 26.1.2 · Pack Format 101.1
Cobble
A modern, Python-like language for creating Minecraft data packs with functions, events, resources, validation, and generated metadata.
Readable sourceIndentation, functions, imports, and thin helper APIs.
Real data packsFunctions, pack metadata, tags, predicates, dialogs, and JSON.
Validation pathGenerated commands can be checked against Minecraft's command tree.
Browser exportDownload generated files or a data pack ZIP from `/try`.
Examples
Write data pack logic directly
Cobble stays close to Minecraft output while removing repetitive function and resource boilerplate.
Modern Items
def reward(player):
/give {player} minecraft:diamond_sword[
minecraft:custom_name='{"text":"Cobble Blade"}'
] 1Data Pack Resources
datapack.function_tag("minecraft:load", ["demo:on_load"])
datapack.predicate("checks/always", {
"condition": "minecraft:random_chance",
"chance": 1
})In Browser
Try the compiler when you are ready to inspect output.
The Rust parser and transpiler run through WebAssembly. The compiler view shows functions, resources, metadata, diagnostics, and ZIP output.