diff --git a/nix/module-eval/swarm-services-switch.nix b/nix/module-eval/swarm-services-switch.nix
index 36be82f6..9d13a4c7 100644
--- a/nix/module-eval/swarm-services-switch.nix
+++ b/nix/module-eval/swarm-services-switch.nix
@@ -177,6 +177,16 @@ let
         in
         lib.length (lib.attrNames es) == 9 && lib.all lib.id (lib.attrValues es);
     }
+    {
+      # Every run spends money on an operator's key, so hosting the shared
+      # services does not start the classifier. The queue is the control:
+      # the same fixture does turn the switch's own services on.
+      name = "hosting the swarm's shared services leaves the review classifier off";
+      ok =
+        !swarmServicesHere.services.hyperhive.deploy.review-classifier.enable
+        && !(swarmServicesHere.containers ? swarm-review-classifier)
+        && swarmServicesHere.services.hyperhive.deploy.nats.enable;
+    }
     {
       # The switch fills in for an operator who has not spoken and yields to
       # one who has — that is what keeps a shared service placeable on a host