fix(sdk): avoid setting messages-tuple if only getMessagesMetadata is requested. (#1513)

.changeset/quiet-hornets-sink.md

@@ -0,0 +1,5 @@
+---
+"@langchain/langgraph-sdk": patch
+---
+
+fix(sdk): avoid setting `messages-tuple` if only `getMessagesMetadata` is requested.

libs/sdk/src/react/stream.tsx

@@ -1401,7 +1401,7 @@ export function useStream<
       message: Message,
       index?: number
     ): MessageMetadata<StateType> | undefined {
-      trackStreamMode("messages-tuple", "values");
+      trackStreamMode("values");
       return messageMetadata?.find(
         (m) => m.messageId === (message.id ?? index)
       );