worldjen-runner

name	worldjen-runner
description	Set up and operate the WorldJen runner host — the GPU worker daemon that pulls evaluation jobs and executes them. Use when registering, starting, stopping, or inspecting a Linux+systemd machine that runs WorldJen jobs. NOT for evaluation run lifecycle (use `worldjen-bench` for that).

Preamble (run first)

Best-effort update check. Fails silently on network errors or non-marketplace installs. If output starts with UPGRADE_AVAILABLE or JUST_UPGRADED, surface it once to the user and continue with the skill workflow.

{
  for _p in \
    "$HOME/.claude/plugins/marketplaces/worldjen/bin/check-update" \
    "$HOME/.codex/.tmp/plugins/plugins/worldjen/bin/check-update"; do
    if [ -x "$_p" ]; then "$_p" 2>/dev/null && break; fi
  done
} 2>/dev/null || true

WorldJen — Runner

Manage the runner host: the GPU worker daemon that pulls evaluation jobs from WorldJen and executes them.

This skill is for machine setup. For creating or inspecting evaluation runs (the jobs themselves), use the worldjen-bench skill.

Auth

Set WORLDJEN_API_KEY (get one at https://www.worldjen.com/settings/api-keys), or pass --api-key to authenticated commands. Local service commands (install, start, stop, status, logs) do not need auth.

Prereq: Linux + systemd

The runner service requires Linux with systemd. If the host doesn't use systemd, stop and ask before improvising.

If worldjen is not installed yet, run pip install "worldjen[runner]" first (or use the worldjen-install skill).

Discovery

worldjen runner list --json            # backend (your account)
worldjen runner list --local --json    # this machine

Create or register a runner

Use one of:

• worldjen runner create --name <NAME> — create a new runner resource and configure this host in one flow
• worldjen runner register --token <TOKEN> --name <NAME> — register this host using a token from the dashboard

<NAME> is the local instance identifier. Reuse the same --name on every subsequent command. Names must match [a-zA-Z0-9][a-zA-Z0-9_-]{0,63}. Omit --name to use default.

Operate the local service

worldjen runner install --name <NAME>   # install systemd unit (auto-start on boot)
worldjen runner start --name <NAME>
worldjen runner status --name <NAME>
worldjen runner logs --name <NAME> -n 100
worldjen runner logs --name <NAME> -f   # stream

Confirm before destructive operations

These commands change persistent host state or stop running work. Confirm with the user before running:

• worldjen runner install --name <NAME> — installs a systemd unit and enables auto-start on boot. Persists service registration on the host.
• worldjen runner stop --name <NAME> — stops accepting new work; in-flight jobs may fail
• worldjen runner uninstall --name <NAME> — removes the systemd unit
• worldjen runner delete --runner-id <RUNNER_ID> — deletes the runner from the account AND uninstalls the local service. Once deleted, in-flight runs on this runner will fail. Omit --runner-id to use the id from this host's local config (selected via --name).

Stop and ask when needed

• Missing WORLDJEN_API_KEY or registration token
• Host doesn't use Linux + systemd
• The user is unsure which --name to use — list with worldjen runner list --local

See also

• worldjen-install — install worldjen[runner] and verify the CLI
• worldjen-bench — create and inspect evaluation runs (the actual benchmark jobs)
• worldjen-score — score the clip you just generated
• worldjen-rank — quick personal preview vs the standard rank set
• worldjen-leaderboard — public leaderboard

For examples and troubleshooting, see references/examples.md.