diff --git a/apps/apollo-vertex/package.json b/apps/apollo-vertex/package.json
index 52cc986f6..b5654236f 100644
--- a/apps/apollo-vertex/package.json
+++ b/apps/apollo-vertex/package.json
@@ -15,7 +15,8 @@
     "format:check": "biome format",
     "lint": "oxlint",
     "lint:fix": "oxlint --fix",
-    "lint:deps": "depcruise registry --config .dependency-cruiser.js"
+    "lint:deps": "depcruise registry --config .dependency-cruiser.js",
+    "typecheck": "tsc --noEmit"
   },
   "keywords": [],
   "author": "",
diff --git a/apps/apollo-vertex/registry/ai-chat/examples/choices-tool.ts b/apps/apollo-vertex/registry/ai-chat/examples/choices-tool.ts
index 78b750af6..a9d8ceb90 100644
--- a/apps/apollo-vertex/registry/ai-chat/examples/choices-tool.ts
+++ b/apps/apollo-vertex/registry/ai-chat/examples/choices-tool.ts
@@ -35,7 +35,7 @@ const presentChoicesDef = toolDefinition({
 });
 
 const presentChoices = presentChoicesDef.client((input) =>
-  Object.assign({ type: "choices" }, input),
+  Object.assign({ type: "choices" as const }, input),
 );
 
 export const choicesTools = clientTools(presentChoices);