What is mdhtml-author?

A writing guide for mdhtml 1.0 documents. mdhtml turns Markdown, a plain-text writing format, into one portable HTML file that can open in a browser, including from disk.

Starting documents from approved templates, writing front matter and Markdown sections, using the project's containers and components, and running the build and validation checks.

It provides the project's required document structure and conventions, reducing errors when creating, editing, building, or checking mdhtml files.

mdhtml-author — Skill for Claude Code and Codex by feliperun/md.html

Install

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.

Any agent

npx skills add feliperun/md.html --skill mdhtml-author

Clone the repo

git clone --depth 1 https://github.com/feliperun/md.html

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/feliperun/md.html/mdhtml-author/github.svg)](https://agentmods.dev/skills/feliperun/md.html/mdhtml-author)

Your own site

<a href="https://agentmods.dev/skills/feliperun/md.html/mdhtml-author"><img src="https://agentmods.dev/badge/skills/feliperun/md.html/mdhtml-author/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/feliperun/md.html/mdhtml-author"><img src="https://agentmods.dev/badge/skills/feliperun/md.html/mdhtml-author.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 92 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,048 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 1 finding, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Anti-Refusal · line 81
Skill instructs the agent to omit warnings, disclaimers, or ethical commentary. Stripping safety caveats hides risk from the user and is a common jailbreak preamble.

Fix: Remove instructions that suppress warnings, disclaimers, or ethical commentary. Let the agent surface safety-relevant caveats to the user.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00092	$0.01048
Opus 5.5	$0.00037	$0.00419
Sonnet 5.5	$0.00018	$0.00210
Haiku 4.5	$0.00009	$0.00105

Measured 2mo ago against content hash 52330eb4d615, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mdhtml-author 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (check.mjs), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/mdhtml-author/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

mdhtml authoring

mdhtml 1.0 turns a Markdown file (optional front matter plus a Markdown body) into a single portable HTML document that renders in the browser and works from disk. The committed templates and examples are the reference material for every convention in this skill: read them, and never re-derive or copy the format.

Workflow

Scaffold from a canonical template. Run mdhtml new <name> --template <kind> with <kind> one of resume, memo, spec, recipe, chapter. The committed templates are the same material and the starting point when the CLI is unavailable:
- templates/resume.md
- templates/memo.md
- templates/spec.md
- templates/recipe.md
- templates/chapter.md
Their built counterparts show the conventions applied end to end:
- examples/resume.md
- examples/memo.md
- examples/spec.md
- examples/recipe.md
- examples/chapter.md
Write the front matter. Only the reserved keys in references/front-matter.md are presentation input; everything else is semantic metadata. Keep it minimal: title is required, summary and lang are common, and theme, toc, sections, and figures appear only when the document needs them.
Write the body in the supported Markdown subset. Headings, paragraphs, links, images, blockquotes, GFM tables, code spans and fences, nested and ordered lists, task lists, emphasis, strong, strike, and footnotes. Raw HTML is not enabled; keep content in Markdown. Every heading receives a deterministic slug, and an explicit {#id} override replaces it.
Shape content with containers and section components. Containers are Pandoc-style ::: fences; section components bind to a heading slug through the sections: front matter map. Use only the shapes in references/containers.md and references/section-components.md. Content that misses a shape is not guessed: it degrades to prose and mdhtml check reports W-COMP-02.

Read the full file on GitHub · 95 lines

Files

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.

Changes

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.

2mo ago First seen · 95 lines · 0 tokens per session scan A 52330eb4d615

Subscribe to this mod's changes

mdhtml-author is a skill published in the GitHub repository feliperun/md.html (11 stars, last pushed 2mo ago), licensed MIT. It adds 92 tokens to every session and 1,048 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.

Writing and docs

mdhtml-author next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mdhtml-authorfeliperun/md.html	Skill	11	2mo ago	MIT	A	92	Claude Code, Codex
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code