Graphene is a tool I've been working on with Codex to create, publish, manage stacked branches and PRs. It's become a indispensable tool to manage code for me and other co-workers since moving off of paid stacked PR products.

It stores its state in local gitconfig and is just a wrapper around regular git commands. Graphene doesn't actually interact with the Github API at all. PRs have to be created manually (but it does print quick links after a push to create properly stacked PRs)

Graphene comes with agent skills so you can have your favourite agent create atomic PRs that are easy for humans to review.

I'm curious to see if anyone has any feedback on it.