Sadly, this doesn't work on the line-level yet. I know that wasn't the main purpose of your comment, but figured I'd mention that first.

Getting more to the heart of your question: the main use-case for this (and the reason Span developed it) is to understand the impact of AI coding assistants in aggregate for their customers. The explosion of AI-generated code is creating some strange issues that engineering teams need to take into account, but visibility is super low right now.

The main idea is that – with some resolution around which code is AI-authored and human-authored – engineering teams can better understand when and how to deploy AI-generated code (and when not to).