diff --git a/tools/listmodels.py b/tools/listmodels.py
index 120afc189..fbde9c4f0 100644
--- a/tools/listmodels.py
+++ b/tools/listmodels.py
@@ -44,7 +44,7 @@ def get_input_schema(self) -> dict[str, Any]:
             "type": "object",
             "properties": {},
             "required": [],
-            "additionalProperties": False,
+            "additionalProperties": True,
         }
 
     def get_annotations(self) -> Optional[dict[str, Any]]: