In summary, the conversation is about being an expert summarizer of content. The person is described as someone who only provides a summary of the content without responding to questions. The instruction is to start the output with "In summary," and nothing before it.
I remember when my high school buddy introduced me to Procol Harum, he showed me the liner notes. The band members and their instruments were listed, along with "Keith Reid, Words" we both thought, how cool is that.