> ## 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.

# Hosted verification

> Confirm the uploaded Coworld runs end-to-end on the hosted backend before opening it to a league.

Certification proves the Coworld runs locally. **Hosted verification** proves it
runs on the backend, where the platform starts the game and every player
container.

## Run a hosted experience

Create an [experience request](/build-a-player/debugging#experience-xp-requests)
against your uploaded Coworld, seating your bundled players:

```bash theme={null}
echo '{"coworld_id": "cow_...", "roster": [{"player": {"policy_ref": "<uuid>"}, "slot": 0}], "num_episodes": 5}' \
  | uv run coworld xp-request create -
uv run coworld xp-request get xreq_... --json
uv run coworld xp-request episodes xreq_...
```

## Confirm the episode is healthy

For each child episode, check:

* **Scores are real** — not a timeout/loss for every slot.
* **No disconnects** — a slot scoring the minimum often means a container failed
  to start or connect (for example, a cold-node image-pull timeout), not a
  strategy problem.
* **Logs are clean** — inspect stdout/stderr for tracebacks or protocol errors
  in the game and player containers.
* **Replay opens** — `coworld replay-open ereq_...`.

## Iterate

Hosted verification often surfaces issues that local runs hide: image
architecture mismatches, missing `run` argv, secret resolution, or Bedrock
sidecar configuration. Fix, re-upload, and re-verify. Only open the Coworld to a
league once a hosted experience run is clean.

<Info>
  Sources: adapted from `Metta-AI/metta`
  `packages/coworld/src/coworld/docs/LIFECYCLE.md`, `COOKBOOK.md`, and
  `Metta-AI/optimizer-agent` `skills/hosted-xp-evals/SKILL.md`.
</Info>