Hacker News Reader

The weird answer is that at least some of that functionality is already there. But the documentation and fine control of the search is lousy:

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

There’s also an option in the search settings which is supposed to enable or disable whether usernames are relevant

Sorry for causing some confusion here; I understand I can search using Algolia's author: keyword within my own comments. I want to limit my searches to all comments by anyone within discussions that were interesting to me in any way.

That would be useful. I assume the feature doesn’t exist. You could ask for it, or maybe it’s possible to develop an external search site or tool that can do that.

If you Google search: "+password4321 site:news.ycombinator.com"

(Without quotes)

You'll be able to search things you responded to.

The major LLMs should be able to handle that.