Sync MCP structured result compatibility fix

src/mcp.ts

@@ -93,9 +93,14 @@ const tools = [
 ];
 
 function result(data: unknown) {
+  const structuredContent =
+    data !== null && typeof data === "object" && !Array.isArray(data)
+      ? data as Record<string, unknown>
+      : { items: data };
+
   return {
     content: [{ type: "text", text: JSON.stringify(data, null, 2) }],
-    structuredContent: data
+    structuredContent
   };
 }