TL;DR: Anthropic built its own version control system and fully migrated its monorepo off Git in five months after agent-generated code volume overwhelmed human-scale developer infrastructure.
Summary: Anthropic published an engineering blog post describing how it replaced Git with an in-house version control system, completing a full monorepo migration in five months. The driver was merge throughput: roughly 2,500 code changes merged per day in May, rising past 30,000 per day by September, which bottlenecked tooling designed for human rather than agent scale.
Why it matters: It is a concrete signal that AI coding agents are pushing real repos past the limits of Git-era infrastructure, and a preview of the tooling gaps teams will hit as agent-authored commits multiply. Watch for the blog's architectural details and consider where your own VCS, CI, and review pipelines would break at 10x merge volume.
Source: x_com