Boris Cherny, Head of Claude Code at Anthropic, posted a stat on X this morning. In the last 30 days, 100% of his contributions to Claude Code were written by Claude Code itself. 259 PRs. 497 commits. 40,000 lines added. 38,000 removed. Zero by the head of the team. Most reads of this go straight to "AI-assisted dev productivity is real." That's the obvious layer. It's not the interesting one. The Engineering Leadership Read If you run a team in 2026 - staff+ engineer or EM or director - the data point that matters is the second one. The head of a product team is no longer the team's most prolific code author. The head of the team is also no longer the team's most prolific reviewer; Claude Code does the first pass on its own PRs. The work the head of the team is doing all day, then, is not the artifact. The artifact (the spec, the PR description) is a thing AI ships now. The calls inside the artifact - what to build, what to kill - those are the work.…