fix(agent): recover Codex streams with null output

tests/agent/test_auxiliary_client.py

@@ -2554,6 +2554,45 @@ class TestCodexAuxiliaryAdapterTimeout:
         assert time.monotonic() - started < 0.14
 
 
+class TestCodexAuxiliaryAdapterNullOutputRecovery:
+    def test_recovers_output_item_when_sdk_raises_during_iteration(self):
+        """Regression for #11179 in auxiliary calls such as compression/title generation."""
+
+        output_item = SimpleNamespace(
+            type="message",
+            content=[SimpleNamespace(type="output_text", text="aux survived")],
+        )
+
+        class NullOutputParseStream:
+            def __enter__(self):
+                return self
+
+            def __exit__(self, exc_type, exc, tb):
+                return False
+
+            def __iter__(self):
+                yield SimpleNamespace(type="response.output_item.done", item=output_item)
+                raise TypeError("'NoneType' object is not iterable")
+
+            def get_final_response(self):  # pragma: no cover - iterator fails first
+                raise AssertionError("get_final_response should not be reached")
+
+        class FakeResponses:
+            def __init__(self):
+                self.create = MagicMock()
+
+            def stream(self, **kwargs):
+                return NullOutputParseStream()
+
+        fake_client = SimpleNamespace(responses=FakeResponses())
+        adapter = _CodexCompletionsAdapter(fake_client, "gpt-5.5")
+
+        response = adapter.create(messages=[{"role": "user", "content": "summarize"}])
+
+        assert response.choices[0].message.content == "aux survived"
+        fake_client.responses.create.assert_not_called()
+
+
 # ---------------------------------------------------------------------------
 # Issue #23432 — auxiliary timeout poisons cached client; later aux calls fail
 # ---------------------------------------------------------------------------