Milestone connects AI tool activity to your actual code. Every PR and commit is analyzed to determine whether it was AI-influenced, and that signal is layered onto your engineering metrics. You can see, for example, that Sonnet 4.5 was responsible for 52% of merged PRs last quarter, that AI-impacted PRs had a 15% shorter coding time but a 20% longer review time, and that post-review change rates stayed flat – meaning quality wasn’t the issue, reviewer bandwidth was.