diff --git a/agent.py b/agent.py
index 1d9c33f..c581fc2 100644
--- a/agent.py
+++ b/agent.py
@@ -371,6 +371,15 @@ def _build_comparison_result(comparison_id: str, quotes: list[QuoteInput], weigh
     }
 
 
+def _quote_sort_key(item: dict[str, Any]) -> tuple[Any, ...]:
+    return (
+        -item["scores"]["weighted_total"],
+        item["total_price"],
+        item["delivery_days"],
+        item["vendor"].lower(),
+    )
+
+
 def _parse_browser_documents(documents: list[BrowserDocument]) -> dict[str, Any]:
     quotes: list[QuoteInput] = []
     errors: list[dict[str, Any]] = []