Once authenticated with Google (one-time browser login), you provide source URLs, PDFs, or topics. The skill creates a NotebookLM notebook, ingests sources, and either generates downloadable artifacts directly (audio, video, slides, reports) or uses cited research answers to power Claude-written articles, social posts, and newsletters. For trending topics, it auto-discovers sources and drafts content. Output depends on your choice: native NotebookLM artifacts (podcast MP4, slide deck PDF, quiz JSON) or Claude-generated content (Markdown articles, platform-specific social posts).