Claude Code's Secret Weapon: Access Multiple Directories in One Session

Ever built the same feature twice in different projects? There's a better way. In this tutorial, I'll show you how to use Claude Code's additional directories feature to give it access to multiple projects simultaneously, so it can learn from your existing implementations and apply that knowledge to new ones. I walk through a real-world example: migrating a manual podcast listing (markdown files) to an automated Transistor API integration. Instead of asking Claude to research the Transistor API from scratch, I pointed it to my Spring Office Hours website where I'd already built this exact fea…