fix(codex): rotate pool on usage limit 429

tests/run_agent/test_run_agent.py

@@ -3746,6 +3746,37 @@ class TestCredentialPoolRecovery:
         assert retry_same is False
         agent._swap_credential.assert_called_once_with(next_entry)
 
+    def test_recover_with_pool_rotates_usage_limit_429_immediately(self, agent):
+        next_entry = SimpleNamespace(label="secondary")
+        captured = {}
+
+        class _Pool:
+            def current(self):
+                return SimpleNamespace(label="primary")
+
+            def mark_exhausted_and_rotate(self, *, status_code, error_context=None):
+                captured["status_code"] = status_code
+                captured["error_context"] = error_context
+                return next_entry
+
+        agent._credential_pool = _Pool()
+        agent._swap_credential = MagicMock()
+
+        recovered, retry_same = agent._recover_with_credential_pool(
+            status_code=429,
+            has_retried_429=False,
+            error_context={
+                "reason": "usage_limit_reached",
+                "message": "The usage limit has been reached",
+            },
+        )
+
+        assert recovered is True
+        assert retry_same is False
+        assert captured["status_code"] == 429
+        assert captured["error_context"]["reason"] == "usage_limit_reached"
+        agent._swap_credential.assert_called_once_with(next_entry)
+
 
     def test_recover_with_pool_refreshes_on_401(self, agent):
         """401 with successful refresh should swap to refreshed credential."""
@@ -3832,6 +3863,22 @@ class TestCredentialPoolRecovery:
         assert context["message"] == "Weekly credits exhausted."
         assert context["reset_at"] == "2026-04-12T10:30:00Z"
 
+    def test_extract_api_error_context_uses_type_as_reason(self, agent):
+        error = SimpleNamespace(
+            body={
+                "error": {
+                    "type": "usage_limit_reached",
+                    "message": "The usage limit has been reached",
+                }
+            },
+            response=SimpleNamespace(headers={}),
+        )
+
+        context = agent._extract_api_error_context(error)
+
+        assert context["reason"] == "usage_limit_reached"
+        assert context["message"] == "The usage limit has been reached"
+
     def test_recover_with_pool_passes_error_context_on_rotated_429(self, agent):
         next_entry = SimpleNamespace(label="secondary")
         captured = {}