diff --git a/run_agent.py b/run_agent.py
index d13346247..78ceabe61 100644
--- a/run_agent.py
+++ b/run_agent.py
@@ -4692,6 +4692,14 @@ class AIAgent:
             # Use the Anthropic SDK's streaming context manager
             with self._anthropic_client.messages.stream(**api_kwargs) as stream:
                 for event in stream:
+                    # Update stale-stream timer on every event so the
+                    # outer poll loop knows data is flowing.  Without
+                    # this, the detector kills healthy long-running
+                    # Opus streams after 180 s even when events are
+                    # actively arriving (the chat_completions path
+                    # already does this at the top of its chunk loop).
+                    last_chunk_time["t"] = time.time()
+
                     if self._interrupt_requested:
                         break
 
@@ -4715,6 +4723,7 @@ class AIAgent:
                                 if text and not has_tool_use:
                                     _fire_first_delta()
                                     self._fire_stream_delta(text)
+                                    deltas_were_sent["yes"] = True
                             elif delta_type == "thinking_delta":
                                 thinking_text = getattr(delta, "thinking", "")
                                 if thinking_text: