diff --git a/litellm/proxy/utils.py b/litellm/proxy/utils.py
index a914cfee03a..72a7e3ee434 100644
--- a/litellm/proxy/utils.py
+++ b/litellm/proxy/utils.py
@@ -1153,6 +1153,8 @@ def _overrides_moderation_hook(callback: CustomLogger) -> bool:
 
 
 _LISTED_MODEL_NAMES: Final = TypeAdapter(tuple[str, ...])
+_MCP_TOOL_DESCRIPTION: Final[TypeAdapter[str | None]] = TypeAdapter(str | None)
+_MCP_TOOL_INPUT_SCHEMA: Final[TypeAdapter[Mapping[str, object] | None]] = TypeAdapter(Mapping[str, object] | None)
 
 
 @dataclass(frozen=True, slots=True)
@@ -1741,8 +1743,8 @@ class ProxyLogging:
             tool_name=kwargs.get("name", ""),
             arguments=kwargs.get("arguments", {}),
             server_name=kwargs.get("server_name"),
-            tool_description=kwargs.get("tool_description"),
-            tool_input_schema=kwargs.get("tool_input_schema"),
+            tool_description=_MCP_TOOL_DESCRIPTION.validate_python(kwargs.get("tool_description")),
+            tool_input_schema=_MCP_TOOL_INPUT_SCHEMA.validate_python(kwargs.get("tool_input_schema")),
             user_api_key_auth=user_api_key_auth_dict,
             hidden_params=HiddenParams(),
         )