diff --git a/apps/ai-game-creator-shell/src-tauri/src/agent/design_runtime.rs b/apps/ai-game-creator-shell/src-tauri/src/agent/design_runtime.rs
index 45e2a6392..2d24a4997 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/agent/design_runtime.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/agent/design_runtime.rs
@@ -696,6 +696,7 @@ async fn request_design_provider(
         ));
         let result = if llm.stream {
             let mut stream_sequence = 0_u64;
+            let mut emitted_reasoning = String::new();
             client
                 .stream_run(request.clone(), |delta| {
                     stream_sequence = stream_sequence.saturating_add(1);
@@ -727,13 +728,16 @@ async fn request_design_provider(
                             None,
                         ));
                     }
-                    if !delta.reasoning_delta.is_empty() {
+                    if !delta.reasoning_delta.is_empty()
+                        || delta.accumulated_reasoning != emitted_reasoning
+                    {
                         emit(design_reasoning_event(
                             root,
                             &turn_id,
                             Some(&message_id),
                             delta.accumulated_reasoning.clone(),
                         ));
+                        emitted_reasoning = delta.accumulated_reasoning.clone();
                     }
                 })
                 .await