In 2026, Anthropic's artificial intelligence (AI) agents began to merge more than 30,000 code changes a day into one repository, and git could no longer keep up. So Anthropic built its own source control system, Scion. Here is the problem it solves, how it works, and what it means for teams that will keep using git.
Two Claude Code sessions in the same folder will sooner or later edit the same file and undo each other's work. A worktree fixes that by giving each session its own copy of the files on its own branch. Here is where Claude Code stores worktrees, how they work, what they share with your main folder, and the small routine that makes them worth using.
Nearly every software company keeps its most valuable asset on a platform somebody else owns: GitHub, GitLab, Bitbucket, or one of a handful of smaller hosts. Your git history can leave any of them in an afternoon — almost nothing else you built there can, so who owns the platform matters more than its feature list.
Your ~/.claude folder quietly accumulates two very different things: configuration you'd hate to lose, and private data you must never publish. Here's how to put the first under git without ever committing the second.