Meta Tag Preview — How Your Link Looks When Shared
When a link is shared, the receiving platform reads a set of meta tags to build a preview card: title, description, image. This retrieves those tags and shows what will be produced. It is a part of the page nobody looks at during development, because it is invisible on the page itself.
When it helps
Because the failure is public and embarrassing. A missing image tag produces a bare text link with no card at all. An image at the wrong dimensions is cropped badly, often through the middle of a logo. A description inherited from a template says the same thing on every page. A relative image URL fails entirely, because the platform fetching it has no base to resolve against. All of these look fine in a browser and only appear when someone shares the link.
Worth running automatically
The tags are generated by a template, so a change to that template affects every page at once and there is no error when it goes wrong. A refactor that breaks the image path, or a migration that drops the description, silently degrades every share from that moment on — and the feedback loop is somebody mentioning that a link looked odd, weeks later. Checking a representative page on a schedule catches it at deploy time, when it is a one-line fix rather than an archaeology project.
What you get out of it
Shows a part of your site that only appears when someone else shares it, and that nothing in your own testing will ever surface. Cheap to check and awkward to discover any other way.