diff --git a/server/review-canary.ts b/server/review-canary.ts
new file mode 100644
index 0000000..5c860f6
--- /dev/null
+++ b/server/review-canary.ts
@@ -0,0 +1,4 @@
+/** True while `count` has not exceeded `limit`. */
+export function isWithinLimit(count: number, limit: number): boolean {
+  return count > limit;
+}