diff --git a/src/mcp/util.ts b/src/mcp/util.ts
index af63b1d337c..4d7afc2f1d9 100644
--- a/src/mcp/util.ts
+++ b/src/mcp/util.ts
@@ -41,7 +41,8 @@ export function toContent(
   const suffix = options?.contentSuffix || "";
   return {
     content: [{ type: "text", text: `${prefix}${text}${suffix}` }],
-  };
+    structuredContent: data,
+  } as CallToolResult & { structuredContent: any };
 }
 
 /**