diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index b134944..6f2d0b2 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -171,20 +171,9 @@ const App = () => {
       }
 
       // Claude stream-json events
-      if (type === 'assistant') {
-        // Full assistant message (not streaming)
-        const content = data.message?.content;
-        let text = '';
-        if (Array.isArray(content)) {
-          text = content.filter(b => b.type === 'text').map(b => b.text).join('');
-        } else if (typeof content === 'string') {
-          text = content;
-        }
-        if (text) {
-          pendingAssistantRef.current += text;
-          upsertStreamingMessage(pendingAssistantRef.current, false);
-        }
-      }
+      // NOTE: We intentionally skip the 'assistant' event type.
+      // It contains the full message text that was ALREADY streamed via
+      // content_block_delta events, so handling it would create a duplicate bubble.
 
       if (type === 'content_block_delta') {
         const delta = data.delta;