diff --git a/run_agent.py b/run_agent.py
index 9d778b3d7..1db61cf58 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -3924,6 +3924,23 @@ class AIAgent:
                         _fire_first_delta()
                         self._fire_stream_delta(delta.content)
                         deltas_were_sent["yes"] = True
+                    else:
+                        # Tool calls suppress regular content streaming (avoids
+                        # displaying chatty "I'll use the tool..." text alongside
+                        # tool calls).  But reasoning tags embedded in suppressed
+                        # content should still reach the display — otherwise the
+                        # reasoning box only appears as a post-response fallback,
+                        # rendering it confusingly after the already-streamed
+                        # response.  Route suppressed content through the stream
+                        # delta callback so its tag extraction can fire the
+                        # reasoning display.  Non-reasoning text is harmlessly
+                        # suppressed by the CLI's _stream_delta when the stream
+                        # box is already closed (tool boundary flush).
+                        if self.stream_delta_callback:
+                            try:
+                                self.stream_delta_callback(delta.content)
+                            except Exception:
+                                pass
 
                 # Accumulate tool call deltas — notify display on first name
                 if delta and delta.tool_calls: