Why HTML?

Agents often answer with prose, and sometimes that is the right format. HTML can be easier to understand when you need to compare designs, try a flow, inspect a system, or show how something works.

Evidence comparison

The medium earns its place when it removes translation work.

Markdown · linear commitmentRelease readiness

Confirm the owner, resolve blockers, validate the build, then release.

1. Resolve blocking checks
2. Confirm ownership
3. Run validation

HTML · spatial evidence

Both artifacts can be correct. Use the HTML version only when seeing hierarchy, width, state, or interaction changes the review.

What HTML adds

HTML can put explanation, layout, state, and interaction in one file. You can open it in a browser, test it at real sizes, click through it, annotate it, and share it with technical or non-technical collaborators.

That makes HTML useful for wireframes, mockups, prototypes, diagrams, visual explainers, reports, presentations, and small purpose-built tools.

Keep Markdown when it is enough

Markdown is usually simpler for notes, short plans, and linear explanations. Use HTML when seeing or trying the idea adds something useful.

Wireframe, mockup, or prototype?See the practical difference between the common levels of fidelity.