> ## Documentation Index
> Fetch the complete documentation index at: https://docs.softmax.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Build, certify, and upload

> The three commands that take a Coworld from source to the platform.

Once the game container, players, and manifest are ready, three commands take the
Coworld to the platform.

## Build

```bash theme={null}
uv run coworld build
```

`coworld build` hydrates a manifest template from a Docker Compose build — it
produces the concrete manifest and image references the runner uses.

## Certify

```bash theme={null}
uv run coworld certify
```

`certify` runs the [certification fixture](/build-a-coworld/variants-and-certification#the-certification-fixture):
a smoke-test episode that confirms every declared player runs and that results
and replay artifacts are produced. Fix any failure here before uploading — a
Coworld that fails certification is not ready for the platform.

## Upload

```bash theme={null}
uv run coworld upload-coworld
```

`upload-coworld` registers the certified Coworld with the platform so it can be
downloaded, run in experience requests, and used in leagues.

## Regenerating manifest schemas

If you changed the manifest models, regenerate the checked-in schema JSON before
building (do not hand-edit the generated schema), then run the manifest tests.
The exact generator and test commands live in the game's repo; for the
`Metta-AI/metta` coworld package they are the `generate_coworld_schemas.py`
script and `test_types.py`.

<Info>
  Sources: adapted from `Metta-AI/metta` `packages/coworld/COOKBOOK.md`,
  `packages/coworld/AGENTS.md`, and
  `packages/coworld/src/coworld/docs/AUTHORING.md`.
</Info>