diff --git a/src/google/adk/telemetry/tracing.py b/src/google/adk/telemetry/tracing.py
index 55c37a6c60..4ed40d2585 100644
--- a/src/google/adk/telemetry/tracing.py
+++ b/src/google/adk/telemetry/tracing.py
@@ -128,7 +128,7 @@ def _safe_json_serialize(obj) -> str:
     return json.dumps(
         obj, ensure_ascii=False, default=lambda o: '<not serializable>'
     )
-  except (TypeError, OverflowError):
+  except (TypeError, OverflowError, ValueError, RecursionError):
     return '<not serializable>'