Why Anthropic built Scion to replace git for its monorepo

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Who: Anthropic
What: shared an engineering write-up how it built a new version control system and migrated its monorepo from Git

What happened

Drawing on Anthropic’s engineering blog, Baoyu explains why the company replaced git with Scion as daily merged code changes grew from around 2,500 in May to more than 30,000 in September. Scion retrieves files on demand, moves operations to the server, and uses layered caches with hit rates above 99%. Anthropic reports that median agent workspace startup fell from 7.1 minutes to 5.1 seconds, while emphasizing that Scion serves exceptionally large monorepos and is not a general-purpose git replacement.

Why it matters

The comparison illustrates how assuming continuous server access changes source control architecture, connecting on-demand file retrieval and server-side operations to the infrastructure demands of agent-generated code.

Reported by 2 sources

The story so far

Anthropic built Scion, its own version control system, and fully migrated its monorepo from Git in five months to address infrastructure bottlenecks as daily merged code changes rose from around 2,500 in May to more than 30,000 in September. Anthropic said seven people built the system, with its repository approaching 100 GB of main-branch history and CI performing roughly 25 million checkouts a day. Scion retrieves files on demand, moves operations to the server, and uses layered caches with reported hit rates above 99%. Anthropic reported that median agent workspace startup time fell from 7.1 minutes to 5.1 seconds. In his explanation of Anthropic’s engineering write-up, Baoyu emphasized that Scion is intended for exceptionally large monorepos and that the company does not plan to make it a general-purpose Git replacement.

Anthropic / Claude Agents Deployment engineering Tutorials #Tutorials and practice #Deployment and engineering #Agent #Anthropic

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