Need an SEO plugin just for adding meta tags

I wanted to add meta tags manually but it seems abit impractical and also can't locate the header section for each post. Looks like i have no choice but to install an seo plugin tho i want to minimize plugin (currently only litespeed). If just for the purpose of adding meta description, which seo plugin is considered the least bloated for that use case? seo framework or slim seo? Or should i use custom field plugin (less script)? Any suggestions is appreciated.