Redesigning source control

Anthropic: At Anthropic, coding is no longer the bottleneck to building systems or doing research. Claude is able to autonomously iterate on research loops, micro-optimize complex programs, and build new services from the ground up at a speed and scale we haven’t seen before. The bottleneck, now, is all of the developer infrastructure built for human scale: source control, builds, and CI. In May 2026, Anthropic averaged around 2,500 code changes merged per day; as of September, we merged over 30,000 per day. In order to support this growth, we built Scion, an in-house version control system, and fully migrated our monorepo from git in five months. Changes merged per day in Anthropic’s monorepo. Chart: Anthropic. Scion isn’t the only way to scale for agents. Cursor’s Git at any scale describes Continuity, a git store that keeps a write-ahead log in S3 as the source of truth and treats every repo on disk as a disposable cache. It came along as Tobi Lütke was frustrated with Shopify’s…