Vibe Keystone bootstraps a CLAUDE.md for any repository — the load-bearing structural file every agent decision in that repo will rest on. Unlike a generic template, Keystone interviews the user for org / decision surface / voice rules / persona before drafting, so the produced file reflects YOUR conventions, not 626Labs defaults baked in. Tenant-aware: detects the repo type from filesystem signals (code platform / marketing site / long-form writing / mixed) and adapts the produced CLAUDE.md to the right shape. Use when starting a new repo or when an existing CLAUDE.md is stale. The keystone is what every other Claude Code workflow rests on; investing 5 minutes here saves agent-confusion across hundreds of future sessions in the repo.