Scion Replaces Git at Agent Scale

This is less a Git obituary than a warning that AI-generated code is exposing infrastructure assumptions built for human-scale development.

• –Scion moves commits, merges, diffs, and blame to scalable server APIs instead of requiring complete local repositories
• –Sparse and virtualized checkouts reduce the cost of Anthropic’s roughly 25 million daily CI checkouts
• –CI achieved a reported 25% CPU capacity gain, while checkout times fell from minutes to seconds
• –A seven-person team built Scion alongside its code-review system, showing how AI coding accelerates infrastructure development itself
• –Scion is unlikely to replace Git broadly, but its design could influence future monorepo and agent-native tooling