diff --git a/letta/llm_api/google_vertex_client.py b/letta/llm_api/google_vertex_client.py
index 48c9324d..60e800a6 100644
--- a/letta/llm_api/google_vertex_client.py
+++ b/letta/llm_api/google_vertex_client.py
@@ -481,5 +481,6 @@ class GoogleVertexClient(LLMClientBase):
                     "required": tool["parameters"]["required"],
                 },
             },
+            "propertyOrdering": ["name", "args"],
             "required": ["name", "args"],
         }