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In containers without unprivileged user namespaces every Codex command fails, yet the review exits 0 and concludes 'no findings' (captured in test/fixtures/codex-sandbox/). The validator now takes execution evidence: 'codex exec --json' command events and the 'codex review' stderr transcript (a command that succeeded proves execution); sandbox failure lines on stderr or in failed command output return unavailable(sandbox_unavailable); exact 'could not run commands / read the diff' phrases are the last fallback. Review text that merely discusses bwrap or namespaces still passes. A free 'codex sandbox ... true' preflight (Linux, 10 s) runs before the paid model probe and every automatic outside review; CODEX_MODE gains sandbox_unavailable, and an inconclusive model probe reports unverified instead of ready (exit code kept for stale callers). Every Codex site (outside-voice resolver, /codex review, challenge, consult) takes its sandbox from _GSTACK_CODEX_SANDBOX and pipes its result through the validator; a static test parses rendered command positions for both. GSTACK_CODEX_NO_SANDBOX=1 (exactly 1, shell env only) switches to danger-full-access with a warning on every use. Sandbox pins in existing tests move from the literal read-only to the selected-sandbox variable; captured autoplan probes are judged against the probe block they executed.