How to generate meta data for large sites?

Hey guys,

What do you recommend for generating meta titles and descriptions for large ecommerce sites?
Is there any tool where I could just feed in the url's for which the meta data is required?

Thanks a lot in advance for your responses!

-Shawn

Your platform should have this already. Similar to what WP uses like %postname% - %site% etc

Meta description is tough in ecommerce. The trade off of writing unique vs what is on the page. It's all just a measure of # of products vs ROI to achieve clickbait.