Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add happycapy-ai/Happycapy-skills --skill html-over-markdowngit clone --depth 1 https://github.com/happycapy-ai/Happycapy-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/happycapy-ai/happycapy-skills/html-over-markdown)<a href="https://agentmods.dev/skills/happycapy-ai/happycapy-skills/html-over-markdown"><img src="https://agentmods.dev/badge/skills/happycapy-ai/happycapy-skills/html-over-markdown/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/happycapy-ai/happycapy-skills/html-over-markdown"><img src="https://agentmods.dev/badge/skills/happycapy-ai/happycapy-skills/html-over-markdown.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00112 | $0.01572 |
| Opus 5.5 | $0.00045 | $0.00629 |
| Sonnet 5.5 | $0.00022 | $0.00314 |
| Haiku 4.5 | $0.00011 | $0.00157 |
Grade A, and why
html-over-markdown scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HTML Over Markdown
Produce a single self-contained .html file as the primary output format instead of Markdown.
Why this exists
Markdown flattens spatial information — diffs, dependency graphs, side-by-side comparisons — into linear text. It has no color, no diagrams, no interaction, and people rarely read past ~100 lines. HTML trades a document the user would skim for one they would actually read.
Concrete wins over Markdown:
- Information density: tables, SVG, CSS, scripts, images — all in one file
- Visual clarity: tabs, collapsible sections, responsive layout, typographic hierarchy
- Sharing: one link, any browser, no special viewer
- Two-way interaction: sliders, toggles, editors, and a copy-back-to-prompt loop
- Expressiveness: no more ASCII diagrams or unicode color approximations
When to use vs. skip
Use this skill when the user asks for:
- A spec, plan, proposal, brainstorm, or multi-option exploration
- A PR writeup, code review, or code/feature explainer
- A report — status, research, incident, weekly
- A side-by-side comparison of designs, approaches, or benchmarks
- A slide deck or visual walkthrough
- A throwaway interactive editor (triage board, feature flags, prompt tuner)
- Anything they'd "actually want to read" — even without the word HTML
Do NOT use this skill when:
- The deliverable is a real
.pdf/.docx/.pptx/.xlsxfile → use those skills - The user wants a production web app (multi-file React/Vue/Next) → use
frontend-designorartifacts-builder - The spec is Git-tracked and teammates need clean diffs → keep Markdown
- The user wants a poster or visual artwork → use
canvas-design - The answer is a one-paragraph reply → just answer
If unsure, read references/principles.md → "What this skill is NOT for".
Workflow
- Identify the scenario from the 5 families in the table below.
- Read the matching section in
references/playbook.mdfor patterns and a prompt template. - Pull reusable snippets from
references/snippets.md(grids, diffs, SVG, sliders, export buttons). - Start from
assets/base-template.html— it has the default style already wired up. Copy it, then fill in. - Write the result to
./outputs/<descriptive-kebab-case>.htmland declare it in the<attachments>block as<file type="static">outputs/<name>.html</file>. - Only if the HTML needs a real server (e.g.,
fetch, complex event handlers that fail onfile://), runpython -m http.server 8080 --directory outputsand/app/export-port.sh 8080. For plain static pages, skip this.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 85 lines · 112 tokens per session scan A a155ee2e47c9
html-over-markdown is a skill published in the GitHub repository happycapy-ai/Happycapy-skills (137 stars, last pushed 1mo ago), licensed MIT. It adds 112 tokens to every session and 1,572 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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