Add explicit save action for agent creation (#1798)

* Add explicit save action for agent creation

* Hide internal save prompts and retry agent reads

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

frontend/src/core/messages/utils.ts

@@ -52,6 +52,10 @@ export function groupMessages<T>(
   }
 
   for (const message of messages) {
+    if (isHiddenFromUIMessage(message)) {
+      continue;
+    }
+
     if (message.name === "todo_reminder") {
       continue;
     }
@@ -323,6 +327,10 @@ export function findToolCallResult(toolCallId: string, messages: Message[]) {
   return undefined;
 }
 
+export function isHiddenFromUIMessage(message: Message) {
+  return message.additional_kwargs?.hide_from_ui === true;
+}
+
 /**
  * Represents a file stored in message additional_kwargs.files.
  * Used for optimistic UI (uploading state) and structured file metadata.