Comment via GitHub Pull Request (opens in new tab)

I wouldn’t say unnecessary; most available comment systems are either a Discuss-style firehose of tracking scripts, or a pain to maintain when self-hosted.

The commit has to be in someone's repo, and GitHub can't reasonably allow you to push to a branch on the original repo, so you have to make a fork.

Thanks! Yeah it was fun to do. Once I had the idea I felt compelled to implement it.

It is a little wasteful to fork the whole repo to make a comment. But it seems unavoidable with this design.

I posted it to /r/github and someone let me know such a thing already exists: https://utteranc.es/ A little cleaner than what I've done here.