Scroll down to the bottom of HN pages, there's a search box; paste the URL in and it shows previous submissions: https://hn.algolia.com/?q=http%3A%2F%2Fwww.laputan.org%2Fmud...

At the top of the page you can click "past" which will do a search on the title, or click the hostname to see all other submissions of that site. But I don't think that's what BaraBatman was asking: rather whether dang has automation for performing those searches and constructing a comment from the results.

I build them manually but can do so pretty quickly using HN Search and a browser extension I wrote that does a lot with keyboard shortcuts.