The Folder That Makes Claude Code Your Best Engineer

The Folder That Makes Claude Code Your Best Engineer Boris Cherny built Claude Code at Anthropic. He runs five parallel Claude instances from his terminal, each one capable of one-shotting a full feature implementation. His secret isn't a better model. It isn't some internal tool the rest of us don't have. It's a folder. The.claude/ directory is where Claude Code's behavior is defined: what it knows about your project, what it's allowed to do, which rules it follows, which specialists it can delegate to, and what happens automatically at every stage of a session.