Why Anthropic replaced Git, and whether you’ll need to

Anthropic replaced Git in its large monorepo with Scion, a proprietary server-side source-control system designed to handle agent-driven development at exceptionally high merge volumes, after its repository grew to more than 30,000 daily merges and millions of CI checkouts. Unlike Git’s distributed model, Scion performs history queries and commits centrally, fetches files on demand, and limits branching, reducing infrastructure CPU and memory use while addressing the costs of a nearly 100 GB code history. Similar approaches have long been used by Google and Meta, while Perplexity and the experimental GitSwarm project show that standard Git can still coordinate many agents when repositories remain smaller and conflicts are managed automatically. The discussion argues that Anthropic’s challenge reflects not merely agent coding but the combination of a giant monorepo, automated review, and rapid merging; its related Antique review system shifts human attention from every code line toward change intent. GitHub and Cursor are instead improving Git’s server infrastructure while preserving its conventional client workflow, suggesting that most teams will not need to replace Git, though organizations with massive monorepos may require specialized alternatives such as Meta’s open-source Sapling.

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