Never heard of graphite before today. Were they built specifically for AI code reviews or it's a pivot / new feature from a company that started with something else?
No, they've been doing "managing stacks of dependent pull requests" for a lot longer than AI code review. I've mostly been a happy user, they simplify a lot of the git pain of continually rebasing and the UI makes stacks much easier to work with than Github's own interface.
They started as a better PR review tool, with the main feature that you can stack PRs that have dependencies on each other. It solves the problem of having PRs merging into other PR branches, or having notes not to merge something until another PR merges. Recently they became an AI code review tool, and just added a bunch of AI tools to the review UI, but you could just ignore it and the core functionality was still great.
