use post content in pinit shortcode description field

Hello, I’m trying to figure out what it will take to get this working. I want to pin the post content, so I’m using the shortcode form and trying to stick get_the_content() into the description=”” field.

Unfortunately I’m still getting the post title as the pin content, and the post content is appearing below the pinit button. Any ideas?

function add_pinterest_via_shortcode( $content ) {
	$pin_content = strip_tags( get_the_content() );
	$content .=  do_shortcode("[pinit description=' $pin_content']");

	return $content;
}
add_filter( 'the_content', 'add_pinterest_via_shortcode');

https://www.ads-software.com/extend/plugins/pinterest-pin-it-button/