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

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Build

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

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Certify

certify runs 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.

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Upload

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

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