Anthropic's Agents Broke Git at 30K Merges a Day

Description and use

Anthropic replaced Git with Scion to handle 30,000 daily merges from Claude agents.

Problem

Git could not handle the 30,000+ merges per day generated by Claude agents, causing mirror drift, checkout explosion, and merge queue bottlenecks.

Outcome

Scion achieved >99% cache hit rates, 200× less CPU/memory, and CI checkout times reduced from minutes to seconds, yielding a 25% CPU capacity win.

Workflow

• 1. Identify Git bottlenecks (mirror drift, checkout traffic, merge queue lock).
• 2. Design Scion with server-side history, API queries, bounded client cache.
• 3. Build Scion in five months by a seven-person team, using Claude agents for coding.
• 4. Migrate 100 GB of main‑branch history from Git to Scion.
• 5. Deploy Scion with three cache tiers and monitor via Claude bots.

Evidence

Anthropic merged about 2,500 code changes per day into its monorepo. By September, that number was 30,000.

Source

Git’s core design dates to 2005, when Linus Torvalds built it for Linux kernel development. Its fundamental assumption is that every clone is a complete, offline‑capable copy of the repository.

Source

Scion uses approximately 200x less CPU and memory than Anthropic’s previous fleet of several hundred Git mirrors.

Source

Claude agents generated the code volume that broke Git. Claude agents then helped build the replacement.

Source