diff --git a/packages/core/src/code_assist/schema.test.ts b/packages/core/src/code_assist/schema.test.ts
new file mode 100644
index 0000000000..dc7dc5ee4d
--- /dev/null
+++ b/packages/core/src/code_assist/schema.test.ts
@@ -0,0 +1,51 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect } from 'vitest';
+import { LoadCodeAssistResponseSchema } from './types.js';
+
+describe('LoadCodeAssistResponseSchema', () => {
+  it('should allow missing showNotice in privacyNotice and default to false', () => {
+    const data = {
+      currentTier: {
+        id: 'standard-tier',
+        privacyNotice: {
+          noticeText: 'Some notice',
+        },
+      },
+      allowedTiers: [
+        {
+          id: 'free-tier',
+          privacyNotice: {},
+        },
+        {
+          id: 'standard-tier',
+          privacyNotice: {
+            showNotice: true,
+          },
+        },
+      ],
+    };
+
+    const parsed = LoadCodeAssistResponseSchema.parse(data);
+
+    expect(parsed.currentTier?.privacyNotice?.showNotice).toBe(false);
+    expect(parsed.allowedTiers?.[0].privacyNotice?.showNotice).toBe(false);
+    expect(parsed.allowedTiers?.[1].privacyNotice?.showNotice).toBe(true);
+  });
+
+  it('should allow missing privacyNotice altogether', () => {
+    const data = {
+      currentTier: {
+        id: 'standard-tier',
+      },
+    };
+
+    const parsed = LoadCodeAssistResponseSchema.parse(data);
+
+    expect(parsed.currentTier?.privacyNotice).toBeUndefined();
+  });
+});
diff --git a/packages/core/src/code_assist/types.ts b/packages/core/src/code_assist/types.ts
index a2447575c4..a24927a97d 100644
--- a/packages/core/src/code_assist/types.ts
+++ b/packages/core/src/code_assist/types.ts
@@ -63,7 +63,7 @@ export type UserTierId = (typeof UserTierId)[keyof typeof UserTierId] | string;
  * privacy notice.
  */
 export const PrivacyNoticeSchema = z.object({
-  showNotice: z.boolean(),
+  showNotice: z.boolean().optional().default(false),
   noticeText: z.string().optional(),
 });
 export type PrivacyNotice = z.infer<typeof PrivacyNoticeSchema>;