nixos-modules

Use when central deployment automation is unavailable and an approved operator must recover a target through direct SSH, signed manifests, forced-command deploy keys, and explicit rollback evidence.

Use when running deployment migration rehearsals in NixOS VM tests or Incus/LXC topology simulations, including check-env, check-runtime, dry-run, runtime launch, failure injections, and production evidence gates.

Use when inspecting Attic or Cachix deployment cache health, proving closure substitute coverage, repairing cache misses, or handling cache token and signing-key boundaries.

Use when performing normal deployment operations, confirming deployment health, running direct SSH deployment wrappers, or deciding whether to fall back to rollback.

Use when investigating a failed, stuck, superseded, or ambiguous deployment across GitHub Actions, deployment event artifacts, mcl status summaries, target journals, cache health, and post-switch health checks.

Use when inspecting or repairing desired-state reconciliation, latest-only state, pending or failed retries, superseded deployments, target locks, and pull-agent status.