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The companion to "Anthropic Just Ditched Git (Claude Broke It)". In May 2026 Anthropic merged about 2,500 code changes a day; on September 9 it merged 30,401. Seven engineers built Scion, an in-house replacement for git, and moved the company over in five months. PAGE 2 — what happened in plain English, with the five words you need. PAGES 3–7 — the 5 lessons, each with the Anthropic quote behind it, what it means and a "do this this week" checklist: the slow part moved (time the whole loop), your job is saying no (the two-question review card), ask for the rewrite with tests (a tests-first recipe), give every part a superfan (a copy-paste prompt plus Claude Tag and Claude Code routines setup), and question the human-speed rules. PAGE 8 — 4 git settings that make big repos faster today (partial clone, sparse checkout, fsmonitor, Scalar). Source: Anthropic Engineering, "Redesigning source control at Anthropic" (Oct 13, 2026). Independent guide from Hyperautomation Labs — not affiliated with Anthropic.

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