diff --git a/src/pages/Chat/message-utils.ts b/src/pages/Chat/message-utils.ts
index c4cb34b86..1df16eed8 100644
--- a/src/pages/Chat/message-utils.ts
+++ b/src/pages/Chat/message-utils.ts
@@ -16,6 +16,10 @@ function cleanUserText(text: string): string {
     .replace(/\s*\[media attached:[^\]]*\]/g, '')
     // Remove [message_id: uuid]
     .replace(/\s*\[message_id:\s*[^\]]+\]/g, '')
+    // Remove Gateway-injected "Conversation info (untrusted metadata): ```json...```" block
+    .replace(/^Conversation info\s*\([^)]*\):\s*```[a-z]*\n[\s\S]*?```\s*/i, '')
+    // Fallback: remove "Conversation info (...): {...}" without code block wrapper
+    .replace(/^Conversation info\s*\([^)]*\):\s*\{[\s\S]*?\}\s*/i, '')
     // Remove Gateway timestamp prefix like [Fri 2026-02-13 22:39 GMT+8]
     .replace(/^\[(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun)\s+\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2}\s+[^\]]+\]\s*/i, '')
     .trim();