diff --git a/packages/tools/src/vercel/middleware.ts b/packages/tools/src/vercel/middleware.ts
index 75d7a12d..f6a346b8 100644
--- a/packages/tools/src/vercel/middleware.ts
+++ b/packages/tools/src/vercel/middleware.ts
@@ -70,7 +70,8 @@ const addSystemPrompt = async (
 	const queryText =
 		mode !== "profile"
 			? params.prompt
-					.slice().reverse()
+			    // Create a shallow copy before reversing to avoid mutating the original array
+			.slice().reverse()
 					.find((prompt) => prompt.role === "user")
 					?.content?.filter((content) => content.type === "text")
 					?.map((content) => (content.type === "text" ? content.text : ""))