diff --git a/lotus/cache.py b/lotus/cache.py
index b5b85c7e..cd306876 100644
--- a/lotus/cache.py
+++ b/lotus/cache.py
@@ -53,7 +53,10 @@ def serialize(value: Any) -> Any:
                 elif hasattr(value, "dict"):
                     return value.dict()
                 elif hasattr(value, "__dict__"):
-                    return {key: serialize(val) for key, val in vars(value).items() if not key.startswith("_")}
+                    return {
+                        "class_name": type(value).__name__,
+                        "attributes": {k: serialize(v) for k, v in vars(value).items()},
+                    }
                 else:
                     # For unsupported types, convert to string (last resort)
                     lotus.logger.warning(f"Unsupported type {type(value)} for serialization. Converting to string.")