diff --git a/app.py b/app.py
index d45161e..7fa69b1 100644
--- a/app.py
+++ b/app.py
@@ -818,7 +818,6 @@ async def startup_event():
             from src.tool_index import get_tool_index
             idx = await asyncio.to_thread(get_tool_index)
             if idx:
-                await asyncio.to_thread(idx.index_builtin_tools)
                 await asyncio.to_thread(idx.get_tools_for_query, "warmup", 8)
                 logger.info("[startup] Tool index pre-warmed")
         except Exception as e: