diff --git a/webui/src/web-components/aggregateAgentMessages.ts b/webui/src/web-components/aggregateAgentMessages.ts
index 366b690..5347540 100644
--- a/webui/src/web-components/aggregateAgentMessages.ts
+++ b/webui/src/web-components/aggregateAgentMessages.ts
@@ -14,6 +14,10 @@
         toolCallResults.set(msg.tool_call_id, msg);
         return false;
       }
+      // Suppress internal message types that shouldn't be displayed
+      if (msg.type == "slug" || msg.type == "compact") {
+        return false;
+      }
       if (seenIds.has(msg.idx)) {
         return false; // Skip if idx is already seen
       }