# Anthropic Authors - Prompt Design - Introduction (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article2.74d541386bbf.png) ## Highlights - Prompts sent via the API must contain `\n\nHuman:` and `\n\nAssistant:` as the signals of who's speaking. In Slack and our web interface we automatically add these for you. ([View Highlight](https://read.readwise.io/read/01gxzt3mh9s600wjc7k69ynqe1)) ^509000101