HTML files beat markdown for agent output. One developer reported an agent producing 20 self-contained .html files instead of a single markdown document, and the results were immediately more useful.
The case is simple: HTML is self-rendering, portable, and requires no additional tooling to view. Markdown depends on a renderer. HTML is the renderer. For agents generating reports, summaries, or structured data, the output format is not a minor detail, it is the entire delivery mechanism.
The full piece digs into why this pattern keeps emerging across different agent workflows and what it means for how we think about LLM output formats. If you are building pipelines that generate documents, this is worth reading before you default to markdown again.
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