{ pkgs, inputs, config, keys, ... }: {
  users.users.ai-worker = {
    isSystemUser = true;
    group = "ai-worker";
    home = "/home/ai-worker";
    createHome = true;
    extraGroups = [ "docker" ];
    shell = pkgs.bashInteractive;
    openssh.authorizedKeys.keys = [
      keys.users.ai-worker.main
    ];
    # No password login - SSH key only
    hashedPassword = "!";
  };
  users.groups.ai-worker = {};

  # Enable restricted AI worker SSH access for ollama benchmarking
  # SECURITY: ai-worker can only:
  #   - SSH into host from Hermes container
  #   - Run docker commands (docker exec ollama ...) via docker group
  #   - NO access to infra repo (no bind mount)
  #   - NO sudo access (no nh, nixos-rebuild, nixpkgs-fmt, nix)
  # WORKFLOW: SSH from Hermes container, run docker benchmarks, return and save results to /opt/data/ai-optimizer/
  services.aiWorkerAccess = true;
}