Resource Packs (Experimental)

Cobble can also write resource-pack assets next to the data pack. The feature is experimental and off by default. Enable it with cobble build --experimental-resource-pack or in cobble.toml:

[experimental]
resource_pack = true

Then import the resource_pack module.

Models And Language Files

from stdlib import resource_pack

resource_pack.item_model("mypack:custom_sword", {
    "parent": "minecraft:item/handheld",
    "textures": {
        "layer0": "mypack:item/custom_sword"
    }
})

resource_pack.block_model("display_block", {
    "parent": "minecraft:block/cube_all",
    "textures": {
        "all": "mypack:block/display_block"
    }
})

resource_pack.lang("en_us", {
    "item.mypack.custom_sword": "Custom Sword",
    "block.mypack.display_block": "Display Block"
})

resource_pack.item_model writes assets/<namespace>/models/item/<path>.json, resource_pack.block_model writes assets/<namespace>/models/block/<path>.json, and resource_pack.lang writes assets/<namespace>/lang/<locale>.json. The same lowercase namespace/path validation used by datapack.* applies here. JSON must be an object, and lang values must be strings. Multiple lang declarations for the same namespace and locale merge when repeated keys have identical values; conflicting values are an error.

Static Assets

When resource-pack output is enabled, Cobble also copies static files from the project assets/ directory into the generated pack. Use assets/<namespace>/... for textures, sounds, blockstates, and other resource-pack files:

assets/mypack/textures/item/custom_sword.png
assets/mypack/models/item/generated_wand.json

Static asset paths must stay inside the project assets/ tree, use lowercase Minecraft-safe path segments, and must not be symlinks. A validated build stages generated and static assets before it replaces the final output.

Diagnostics

Resource-pack helpers report these diagnostic kinds:

Checking The Output

ZIP output includes assets/, and cobble inspect --json lists generated models, lang files, and copied assets:

cobble build --experimental-resource-pack --validate --zip
cobble inspect output --json