diff --git a/src/tool.ts b/src/tool.ts
index e4a97f26..14d03e54 100644
--- a/src/tool.ts
+++ b/src/tool.ts
@@ -136,7 +136,7 @@ export class BaseTool {
           },
         }),
       },
-    } as ToolSet;
+    };
   }
 }