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The grok access token has a ~6h server-set TTL (the client cannot lengthen it), the CLI has no refresh command, and headless 'grok -p' does NOT self-refresh an expired token -- it hangs forever at an interactive 'Waiting for authorization...' prompt. Live evidence: a fleet went silent within ~3 min of the token's 06:54 expiry, every agent a zombie hung at the prompt, requiring a manual 'grok login'. - grok_auth.refresh_if_stale: mint a fresh access token from the offline_access refresh token via xAI's OIDC refresh_token grant (https://auth.x.ai/oauth2/token), atomically rewriting auth.json. The orchestrator runs it once per dispatch tick (serial -> no concurrent refresh-token rotation race; throttled to 60s), keeping the host credential live so agents never mount a dead one. No more manual login. - Entrypoint --check guard: refuse to run (exit 78) on a missing/expired token instead of hanging for hours -- surfaced to _handle_stopped_container. - Orchestrator grok-dir mount flipped read-only -> read-write in all three compose files so the refresh can rewrite auth.json; the per-agent file mount stays RO. Verified: 10 unit tests; the --check guard exits 0/1/1 (valid/expired/missing) inside the real roboco-agent-grok image. Gate green (ruff/mypy/xenon).