Simon Willison • 4/18/2026

Adding a new content type to my blog-to-newsletter tool

Simon Willison explains how he used a single prompt with Claude Code to add a new 'beats' content type to his blog-to-newsletter tool. The tool generates a Substack newsletter from his blog content. 'Beats' capture external content like open source releases, new tools, and museum visits. The prompt instructed the AI to clone his blog repository for reference, update the newsletter HTML to include beats with descriptions (similar to the Atom feed), and test the result. The article details the prompt breakdown and the workflow, showcasing an efficient way to leverage AI for coding tasks.

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#JavaScript #html #Claude Code