What is web-to-markdown?

A tool for turning web pages into cleaned Markdown text using different fetching methods for general pages, YouTube, and certain restricted sites.

Use it to fetch article-like pages, extract YouTube transcripts or content, handle supported special-site pages, and return Markdown or JSON metadata.

It removes page clutter and selects an appropriate extraction route so article content is easier to read and reuse.

web-to-markdown — Skill for Claude Code and Codex by rookie-ricardo

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 rookie-ricardo/erduo-skills --skill web-to-markdown

Clone the repo

git clone --depth 1 https://github.com/rookie-ricardo/erduo-skills

Made for: Claude Code, Codex.

Or install writing-workflows, the plugin that ships this one along with the rest of its 3 skills.

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/rookie-ricardo/erduo-skills/web-to-markdown/github.svg)](https://agentmods.dev/skills/rookie-ricardo/erduo-skills/web-to-markdown)

Your own site

<a href="https://agentmods.dev/skills/rookie-ricardo/erduo-skills/web-to-markdown"><img src="https://agentmods.dev/badge/skills/rookie-ricardo/erduo-skills/web-to-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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/rookie-ricardo/erduo-skills/web-to-markdown"><img src="https://agentmods.dev/badge/skills/rookie-ricardo/erduo-skills/web-to-markdown.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 84 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 869 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 pass 7 Sept 2026

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	$0.00084	$0.00869
Opus 5.5	$0.00034	$0.00348
Sonnet 5.5	$0.00017	$0.00174
Haiku 4.5	$0.00008	$0.00087

Measured 2mo ago against content hash da910cfe5b1c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

web-to-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 2mo ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/fetch_generic_fallback.mjs, scripts/fetch_special_sites_http.mjs, scripts/fetch_special_sites.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/web-to-markdown/SKILL.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Web To Markdown

Convert URLs into usable Markdown by applying domain-aware fetching routes, then return the cleaned content directly.

Quick Workflow

Normalize and validate the input URL.
Select route:

r.jina.ai: general web + X/Twitter.
defuddle.md: YouTube transcript/content extraction.
special-browser-fetch: WeChat/Zhihu/Feishu.

Return markdown text (or JSON metadata if needed).

For generic URLs (non-YouTube, non-WeChat/Zhihu/Feishu), use this fallback chain:

try r.jina.ai first,
if it fails, fallback to direct HTTP fetch + Readability,
if direct fetch still fails or returns shell-like content, fallback to browser extraction.

Commands

Run from this skill directory (skills/web-to-markdown):

npm install
node scripts/url_to_markdown.mjs <url>

Return metadata with markdown:

node scripts/url_to_markdown.mjs <url> --json

Force special-site browser extraction:

node scripts/fetch_special_sites.mjs <url> --json

Routing Policy

Default route: https://r.jina.ai/<url>.
YouTube (youtube.com, youtu.be): https://defuddle.md/<url>.
X/Twitter (x.com, twitter.com): https://r.jina.ai/<url>.
WeChat/Zhihu/Feishu: run scripts/fetch_special_sites.mjs.
If input is already proxy-formatted (https://defuddle.md/https://... or https://r.jina.ai/https://...), normalize back to the original URL and re-apply routing.

Special-Site Extraction Behavior

Use a two-stage strategy for WeChat/Zhihu/Feishu:

Try cuimp HTTP/TLS impersonation first, then clean HTML with Mozilla Readability.
If stage 1 fails or returns blocked/shell content, fallback to puppeteer-extra browser impersonation.

HTTP stage impersonates modern Chrome TLS/HTTP profile via cuimp.
Browser stage impersonates a modern Chrome user agent and standard sec-ch-ua headers.
Remove known login modals and backdrop overlays (best effort).
Scroll the page to trigger lazy-loaded article blocks.
Parse cleaned document with Mozilla Readability.
Convert extracted HTML body to Markdown via Turndown.
Resolve browser executable from CHROME_PATH first, then system Chrome/Chromium/Edge paths.

Read the full file on GitHub · 89 lines

Files

What ships with it

8 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 · 89 lines · 84 tokens per session scan A da910cfe5b1c

Subscribe to this mod's changes

web-to-markdown is a skill published in the GitHub repository rookie-ricardo/erduo-skills (943 stars, last pushed 3mo ago), licensed MIT. It adds 84 tokens to every session and 869 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.

Research

web-to-markdown next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
web-to-markdownrookie-ricardo/erduo-skills	Skill	943	3mo ago	MIT	A	84	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	today	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	today	MIT	A	103	Claude Code