diff --git a/ui/litellm-dashboard/src/components/add_model/add_auto_router_tab.tsx b/ui/litellm-dashboard/src/components/add_model/add_auto_router_tab.tsx
index a7516b2a3a12..eeabfc681c85 100644
--- a/ui/litellm-dashboard/src/components/add_model/add_auto_router_tab.tsx
+++ b/ui/litellm-dashboard/src/components/add_model/add_auto_router_tab.tsx
@@ -102,6 +102,21 @@ const tierConfigSummary = (tiers: ComplexityTiers): string => {
   return parts.length > 0 ? parts.join(" · ") : "No tiers configured yet";
 };
 
+// Why the submit is unavailable, or null when it is available. The button reads this to disable
+// itself and to say what is missing, so the two can never give different answers. Checks the
+// config actually being built, not which preset (if any) it came from: a preset only ever
+// prefills once (handlePresetChange), and everything after that is edited exactly like Custom.
+const getSubmitBlockedReason = (
+  config: ComplexityRouterConfigValue,
+  keywordTierRules: KeywordTierRule[],
+  referencedModelsParams: Parameters<typeof getReferencedModelsError>[0],
+  availableModelSet: Set<string>,
+): string | null =>
+  getMissingTiersError(config.tiers) ??
+  getTierLabelsError(config.tier_labels) ??
+  getKeywordTierRulesError(keywordTierRules) ??
+  getReferencedModelsError(referencedModelsParams, availableModelSet);
+
 const AddAutoRouterTab: React.FC<AddAutoRouterTabProps> = ({
   handleOk,
   accessToken,
@@ -222,15 +237,12 @@ const AddAutoRouterTab: React.FC<AddAutoRouterTabProps> = ({
     embeddingModel,
   };
 
-  // Why the submit is unavailable, or null when it is available. The button reads this to disable
-  // itself and to say what is missing, so the two can never give different answers. Checks the
-  // config actually being built, not which preset (if any) it came from: a preset only ever
-  // prefills once (handlePresetChange), and everything after that is edited exactly like Custom.
-  const submitBlockedReason =
-    getMissingTiersError(complexityRouterConfig.tiers) ??
-    getTierLabelsError(complexityRouterConfig.tier_labels) ??
-    getKeywordTierRulesError(keywordTierRules) ??
-    getReferencedModelsError(referencedModelsParams, availableModelSet);
+  const submitBlockedReason = getSubmitBlockedReason(
+    complexityRouterConfig,
+    keywordTierRules,
+    referencedModelsParams,
+    availableModelSet,
+  );
 
   const complexityRouterConfigParams: BuildComplexityRouterConfigParams = {
     tiers: complexityRouterConfig.tiers,
diff --git a/ui/litellm-dashboard/src/components/add_model/build_complexity_router_config.test.ts b/ui/litellm-dashboard/src/components/add_model/build_complexity_router_config.test.ts
index bcbf50bbdea2..187ec7070f2b 100644
--- a/ui/litellm-dashboard/src/components/add_model/build_complexity_router_config.test.ts
+++ b/ui/litellm-dashboard/src/components/add_model/build_complexity_router_config.test.ts
@@ -437,9 +437,8 @@ describe("getTierLabelsError", () => {
   });
 
   it("accepts a full distinct rename", () => {
-    expect(
-      getTierLabelsError({ SIMPLE: "Cheap", MEDIUM: "Standard", COMPLEX: "Premium", REASONING: "Deep" }),
-    ).toBeNull();
+    const fullRename = { SIMPLE: "Cheap", MEDIUM: "Standard", COMPLEX: "Premium", REASONING: "Deep" };
+    expect(getTierLabelsError(fullRename)).toBeNull();
   });
 
   it("rejects two tiers sharing a name, which would be ambiguous in the logs", () => {
@@ -473,9 +472,8 @@ describe("hydrateTierLabels", () => {
   });
 
   it("drops non-string and blank values a hand-edited config could hold", () => {
-    expect(hydrateTierLabels({ SIMPLE: 7, MEDIUM: "  ", COMPLEX: null, REASONING: "Deep" })).toEqual({
-      REASONING: "Deep",
-    });
+    const handEdited = { SIMPLE: 7, MEDIUM: "  ", COMPLEX: null, REASONING: "Deep" };
+    expect(hydrateTierLabels(handEdited)).toEqual({ REASONING: "Deep" });
   });
 
   it("ignores keys that are not tiers", () => {