<meta name="description" content="[[*description:default=`[[*introtext]]`]]" />
This isn't a no go issue, but it's very annoying to me. Things will get a bit more complicated for my client who I'll be teaching how to use the CMS for no reason at all.
Unfortunately I can't use the Description field as a Summary replacement because I'm already using it for the meta tag and it also has a 250 character limit. Therefore I'll create a new TV, but I'm not very happy with it.
<meta name="description" content="[[*description:default=`[[*introtext]]`]]" />
<meta name="description" content="[[*blog_description]]"/>
<meta name="description" content="[[*blog_description]]" />