HTML is the new Markdown: How Anthropic engineers are building with Claude Code | Thariq Shihipar

HTML serves as a more effective medium than Markdown for managing complex interactions with AI agents. As agent-driven tasks grow in duration and complexity, traditional Markdown documents become difficult to parse, whereas HTML provides superior structure, scrollability, and visual clarity. This shift transforms the role of product managers into "compute allocators," requiring strategic decisions on where to invest tokens for maximum impact. By utilizing HTML for project plans, design systems, and custom UI modules, users maintain better alignment with agents, enabling more efficient collaboration and higher-quality outputs. This approach replaces static documentation with interactive, "living" artifacts that are easier for both humans and agents to navigate, ultimately improving the transparency and execution of AI-assisted development workflows.