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Markdown Post Frontmatter Validation

Category: Engineering  ·  Sub-category: engineering-misc  ·  Last updated:
type:review
Use when authoring or reviewing the frontmatter of a markdown post — checking required fields (title, date, slug, tags), validating against the content schema in `lib/content/schema.ts`, catching ambiguous date formats or tags not in the controlled vocabulary, and ensuring the slug matches the file path. Activate this skill whenever the task touches files under `content/posts/**/*.md`, the `parsePostFrontmatter()` helper, or any code path that reads YAML frontmatter from a content file. Do NOT use for general YAML schema design (use a generic schema-design skill) or for chasing a specific build-time validation failure (use debugging).
Security AStatic scan found no risk patternsHow grading works ›

About this skill (catalog notes)

Markdown Post Frontmatter Validation includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); pricing or quota commentary. The SKILL.md is on the shorter side at about 497 words.

Original author
jacob-balslev
Indexed lastmod
Catalog position
Engineering · engineering-misc
Indexed related skills
10

How Markdown Post Frontmatter Validation fits the catalog

Markdown Post Frontmatter Validation sits in the Engineering category under the engineering-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

What this skill does

Markdown Post Frontmatter Validation is a community-contributed Claude Code skill in the engineering-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/markdown-post-frontmatter-validation/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when authoring or reviewing the frontmatter of a markdown post — checking required fields (title, date, slug, tags), validating against the content schema in `lib/content/schema.ts`, catching ambiguous date formats or tags not in the controlled vocabulary, and ensuring the slug matches the file path.

Who uses this skill

The Markdown Post Frontmatter Validation Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 146,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/markdown-post-frontmatter-validation
curl -L https://claudskills.com/skills/markdown-post-frontmatter-validation/SKILL.md \
  -o ~/.claude/skills/markdown-post-frontmatter-validation/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/markdown-post-frontmatter-validation/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/markdown-post-frontmatter-validation/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\markdown-post-frontmatter-validation\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Markdown Post Frontmatter Validation Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/markdown-post-frontmatter-validation/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Markdown Post Frontmatter Validation skill do?
Use when authoring or reviewing the frontmatter of a markdown post — checking required fields (title, date, slug, tags), validating against the content schema in `lib/content/schema.ts`, catching ambiguous date formats or tags not in the controlled vocabulary, and ensuring the slug matches the file path. Activate this skill whenever the task touches files under `content/posts/**/*.md`, the `parsePostFrontmatter()` helper, or any code path that reads YAML frontmatter from a content file. Do NOT use for general YAML schema design (use a generic schema-design skill) or for chasing a specific build-time validation failure (use debugging).
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Markdown Post Frontmatter Validation skill?
Use Markdown Post Frontmatter Validation when your Claude Code task falls under the Engineering category — specifically in the engineering misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Markdown Post Frontmatter Validation" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Markdown Post Frontmatter Validation skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Markdown Post Frontmatter Validation is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
jacob-balslev. (2026). Markdown Post Frontmatter Validation [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/markdown-post-frontmatter-validation/
BibTeX
@misc{markdown-post-frontmatter-validation-2026,
  author    = {jacob-balslev},
  title     = {Markdown Post Frontmatter Validation [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/markdown-post-frontmatter-validation/}
}

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Security scan

Grade A · scanned 2026-07-06 — free static scan against the OWASP Agentic Skills Top 10.

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Browse all Engineering skills → Top 100 skills
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