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md-validation

md-validation is a skill for Claude Code from haowjy/creative-writing-skills. It costs 33 tokens per session (150 once invoked), scanned A, original, Apache-2.0.

A checker for Markdown links and Mermaid diagrams, which are text descriptions used to draw diagrams. It verifies that links point to existing pages and that diagrams render correctly.

In plain words
What is it for?
Use it before shipping Markdown or multi-page documentation to check cross-page links and visually validate Mermaid diagrams.
Why use it?
It catches broken references and diagram errors that may not be obvious from the Markdown source alone.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the creative-writing-skills plugin — 28 skills, 5 agents shipped together

not rated 567repo +13 changed 10d ago A scan SkillSpector: pass 33 tokens original Apache-2.0

Good fit Use it before shipping Markdown or multi-page documentation to check cross-page links and visually validate Mermaid diagrams.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/haowjy/creative-writing-skills/md-validation
View source ↗ haowjy/creative-writing-skills
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 haowjy/creative-writing-skills --skill md-validation
Clone the repo
git clone --depth 1 https://github.com/haowjy/creative-writing-skills

Made for: Claude Code.

Or install creative-writing-skills, the plugin that ships this one along with the rest of its 28 skills, 5 agents.

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.

agentmods badge for md-validation

README.md
[![agentmods](https://agentmods.dev/badge/skills/haowjy/creative-writing-skills/md-validation/github.svg)](https://agentmods.dev/skills/haowjy/creative-writing-skills/md-validation)
Your own site
<a href="https://agentmods.dev/skills/haowjy/creative-writing-skills/md-validation"><img src="https://agentmods.dev/badge/skills/haowjy/creative-writing-skills/md-validation/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.

agentmods 80×15 button for md-validation

Your own site · 80×15
<a href="https://agentmods.dev/skills/haowjy/creative-writing-skills/md-validation"><img src="https://agentmods.dev/badge/skills/haowjy/creative-writing-skills/md-validation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 33 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 150 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00033 $0.00150
Opus 5.5 $0.00013 $0.00060
Sonnet 5.5 $0.00007 $0.00030
Haiku 4.5 $0.00003 $0.00015

Measured 10d ago against content hash 054b0904917b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

md-validation 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 10d 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.

plugin/claude/skills/md-validation/SKILL.md · 21 lines

What it actually says

Markdown Validation

Validate broken links before committing documentation changes. Inspect the link graph when you need to understand document topology or find orphan, hub, and disconnected pages.

Validate Mermaid syntax and style after diagram edits. Fix every reported issue and repeat the validation until it is clean.

See resources/mermaid-authoring.md for diagram authoring rules, validator warning categories, and inline suppressions. See resources/validation-inputs.md for context path names and persistent ignore files.

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.

  1. 10d ago Changed · -7 lines · +21 tokens per session 054b0904917b
  2. 2mo ago First seen · 28 lines · 12 tokens per session scan A d48bdc8c25c1

Subscribe to this mod's changes

md-validation is a skill published in the GitHub repository haowjy/creative-writing-skills (567 stars, last pushed 10d ago), licensed Apache-2.0. It adds 33 tokens to every session and 150 once invoked, about $0.0001 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.

Testing
Related

md-validation compared with skills from other repositories

md-validation next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
md-validationhaowjy/creative-writing-skillsSkill56710d agoApache-2.0A33Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143kyesterdayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143kyesterdayMITA103Claude Code