What is the 'brand voice' feature in Claude and how is it used for content creation?

The brand voice feature lets you upload a batch of documents or emails you've written as sample data, and Claude will analyze them to learn how you talk/write. This is useful for generating blog content or other writing so it doesn't sound like AI wrote it — it sounds like you. One member described feeding it a lot of Zoom transcripts and asking Claude what content, blog posts, or new service line ideas could come out of a given call or client conversation.