A converter that turns a long Markdown document into one self-contained HTML page, a web page that works without separate local assets.

Use it to convert a Markdown file into a portable HTML document with a table of contents and Mermaid diagrams.

It makes plans, specifications, runbooks, and similar documents easier to scan by adding navigation, diagrams, timelines, callouts, and light or dark display modes.

md2html — Skill for Claude Code and Codex by haidang1810

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 haidang1810/md2html --skill md2html

Clone the repo

git clone --depth 1 https://github.com/haidang1810/md2html

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/haidang1810/md2html/md2html/github.svg)](https://agentmods.dev/skills/haidang1810/md2html/md2html)

Your own site

<a href="https://agentmods.dev/skills/haidang1810/md2html/md2html"><img src="https://agentmods.dev/badge/skills/haidang1810/md2html/md2html/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/haidang1810/md2html/md2html"><img src="https://agentmods.dev/badge/skills/haidang1810/md2html/md2html.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 76 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,199 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.

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	$0.00076	$0.03199
Opus 5.5	$0.00030	$0.01280
Sonnet 5.5	$0.00015	$0.00640
Haiku 4.5	$0.00008	$0.00320

Measured 1mo ago against content hash 97cdbfac5c7f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

md2html 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.

SKILL.md · 155 lines

How it starts

The opening of the file, as written. The whole thing — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/md2html

Convert a verbose Markdown document into a single, self-contained HTML file that a tired human can actually scan: diagrams instead of paragraphs, step cards instead of numbered lists, callouts for the parts that matter.

Usage

/md2html <file.md>             # output <file>.html next to source
/md2html <file.md> --out X.html # custom output path
/md2html                       # if no arg, ask user which file

Skill files (resolved relative to this SKILL.md)

template.html — HTML skeleton with embedded CSS (Claude orange light+dark), Mermaid CDN, theme toggle, TOC sidebar, footer. Contains {{PLACEHOLDER}} strings and  slots.
components.md — catalog of HTML snippets you must copy verbatim (step cards, callouts, mermaid blocks, pros-cons, comparison cards, collapsibles).
examples/ — at least one reference <doc>.md → <doc>.html pair. Read one to calibrate output quality before starting.

You MUST read all three before writing output. Do not invent CSS classes or skip the catalog.

What you must do when invoked

Follow these steps in order. Do not skip.

Step 1 — Resolve inputs

Determine the source file from the user's invocation. If none given, ask: "Tệp .md nào cần convert?" and stop.
Read the source .md fully.
Read template.html and components.md from the same directory as this SKILL.md.
Read one example pair under examples/ to calibrate.

Step 2 — Analyze the source document

Do this analysis silently in your head (or as one short summary line to the user). Identify:

Language of the source — detect from the actual prose, not the filename. Set <html lang="..."> to the ISO 639-1 code (en, vi, zh, ja, ko, es, fr, de, ru, ar, th, …) and translate every UI label to that language.

Common samples (extend to any language using the same scheme):

Key	EN	VI	ZH (中文)	JA (日本語)	KO (한국어)	ES (Español)
TOC title	Contents	Mục lục	目录	目次	목차	Contenido
Read-time	~N min read	~N phút đọc	~N 分钟阅读	~N 分で読了	~N분 소요	~N min de lectura
Recommended	★ Recommended	★ Đề xuất	★ 推荐	★ 推奨	★ 추천	★ Recomendado
Key point	Key point	Ý chính	要点	要点	핵심	Idea clave
Pros	✓ Pros	✓ Ưu điểm	✓ 优点	✓ 長所	✓ 장점	✓ Ventajas
Cons	✕ Cons	✕ Nhược điểm	✕ 缺点	✕ 短所	✕ 단점	✕ Desventajas
Print tooltip	Print / Save PDF	In / Lưu PDF	打印 / 保存 PDF	印刷 / PDF 保存	인쇄 / PDF 저장	Imprimir / Guardar
Theme tooltip	Toggle theme	Đổi theme	切换主题	テーマ切替	테마 전환	Cambiar tema
Source: prefix	Source:	Nguồn:	来源:	ソース:	소스:	Fuente:

Read the full file on GitHub · 155 lines

Files

What ships with it

2 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.

1mo ago First seen · 155 lines · 76 tokens per session scan A 97cdbfac5c7f

Subscribe to this mod's changes

md2html is a skill published in the GitHub repository haidang1810/md2html (420 stars, last pushed 5mo ago), licensed MIT. It adds 76 tokens to every session and 3,199 once invoked, about $0.0003 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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