diff --git a/tests/run_agent/test_compression_feasibility.py b/tests/run_agent/test_compression_feasibility.py
index 222ebb2c0bb..9bd5fd9faf2 100644
--- a/tests/run_agent/test_compression_feasibility.py
+++ b/tests/run_agent/test_compression_feasibility.py
@@ -167,6 +167,7 @@ def test_feasibility_check_passes_live_main_runtime():
             "base_url": "https://chatgpt.com/backend-api/codex",
             "api_key": "codex-token",
             "api_mode": "codex_responses",
+            "auth_mode": "",
         },
     )