diff --git a/frontend/src/api/__tests__/attachments.spec.ts b/frontend/src/api/__tests__/attachments.spec.ts
index 1dd182e..3221383 100644
--- a/frontend/src/api/__tests__/attachments.spec.ts
+++ b/frontend/src/api/__tests__/attachments.spec.ts
@@ -16,7 +16,9 @@ describe('attachments api', () => {
       sourceId: '1001',
     });
 
-    const [url, body] = vi.mocked(post).mock.calls[0];
+    const firstCall = vi.mocked(post).mock.calls[0];
+    expect(firstCall).toBeDefined();
+    const [url, body] = firstCall as [string, FormData];
     expect(url).toBe('/attachments/upload');
     expect(body).toBeInstanceOf(FormData);
 
diff --git a/frontend/src/api/modelProvider.ts b/frontend/src/api/modelProvider.ts
index 128f89a..1f158e5 100644
--- a/frontend/src/api/modelProvider.ts
+++ b/frontend/src/api/modelProvider.ts
@@ -40,7 +40,9 @@ export interface ModelRouteRule {
   matchScope: string;
   scopeId?: string;
   primaryModelId: string;
+  primaryModelCode?: string;
   fallbackModelIdsJson?: string;
+  fallbackModelCode?: string;
   routeStrategy: string;
   maxLatencyMs?: number;
   enabled: boolean;
diff --git a/frontend/src/pages/studio/McpImportPage.vue b/frontend/src/pages/studio/McpImportPage.vue
index 83b01ec..a7e70f0 100644
--- a/frontend/src/pages/studio/McpImportPage.vue
+++ b/frontend/src/pages/studio/McpImportPage.vue
@@ -66,8 +66,9 @@ async function loadServers() {
   try {
     const response = await listMcpServers();
     servers.value = response.data ?? [];
-    if (!selectedServerCode.value && servers.value.length > 0) {
-      selectedServerCode.value = servers.value[0].serverCode;
+    const firstServer = servers.value[0];
+    if (!selectedServerCode.value && firstServer?.serverCode) {
+      selectedServerCode.value = firstServer.serverCode;
     }
   } finally {
     loading.value = false;
@@ -193,7 +194,7 @@ onMounted(async () => {
           </button>
         </div>
         <p v-if="selectedServer" class="capability-summary" data-test="mcp-selected-server">
-          当前服务：{{ selectedServer.serverName }} / {{ selectedServer.importType }} / {{ selectedServer.healthStatus }}
+          当前服务：{{ selectedServer?.serverName }} / {{ selectedServer?.importType }} / {{ selectedServer?.healthStatus }}
         </p>
         <div class="capability-grid" v-loading="capabilityLoading">
           <article v-for="item in capabilities" :key="item.capabilityCode" :data-test="`mcp-capability-${item.capabilityCode}`">
diff --git a/frontend/src/pages/studio/ModelWorkspacePage.vue b/frontend/src/pages/studio/ModelWorkspacePage.vue
index e201654..1f8b8a3 100644
--- a/frontend/src/pages/studio/ModelWorkspacePage.vue
+++ b/frontend/src/pages/studio/ModelWorkspacePage.vue
@@ -52,7 +52,7 @@ onMounted(loadWorkspace);
         <div v-for="route in workspace?.routes ?? []" :key="route.id || route.taskType" class="table-row" :data-test="`model-route-${route.taskType}`">
           <strong>{{ route.taskType }}</strong>
           <span>{{ route.primaryModelCode || route.primaryModelId }}</span>
-          <span>{{ route.fallbackModelCode || route.fallbackModelId || '无' }}</span>
+          <span>{{ route.fallbackModelCode || route.fallbackModelIdsJson || '无' }}</span>
           <span class="status-cell">
             <span class="status-pill" :class="routeStatus(route.enabled) === '启用' ? 'is-success' : 'is-warning'">
               {{ routeStatus(route.enabled) }}
diff --git a/frontend/src/pages/studio/ObservabilityPage.vue b/frontend/src/pages/studio/ObservabilityPage.vue
index b9b139a..dde8af5 100644
--- a/frontend/src/pages/studio/ObservabilityPage.vue
+++ b/frontend/src/pages/studio/ObservabilityPage.vue
@@ -47,8 +47,9 @@ async function loadRuns() {
   try {
     const response = await listObservabilityRuns();
     runs.value = response.data ?? [];
-    if (runs.value.length > 0) {
-      await loadTrace(runs.value[0].requestId);
+    const firstRun = runs.value[0];
+    if (firstRun?.requestId) {
+      await loadTrace(firstRun.requestId);
     }
   } finally {
     loading.value = false;