validate-frontmatter

validate-frontmatter is a command for Claude Code from DailybotHQ/deepworkplan-skill. It costs 18 tokens per session (261 once invoked), scanned A, original, MIT.

A command that checks the YAML metadata at the top of every SKILL.md file under skills/. YAML metadata is structured information used to describe and configure each skill.

In plain words
What is it for?
Use it to validate skill names, version formatting, required document markers, and the approved documentation field.
Why use it?
It catches formatting and naming mistakes that would fail the project's continuous-integration checks. This lets you find those errors locally before opening a pull request.

Command for Claude Code

Written for Claude Code: a Claude Code command (commands/*.md). Also seen: installed under .agents/ (shared by several agents); mentions AGENTS.md.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is python3 scripts/validate-frontmatter.py.

Good fit Use it to validate skill names, version formatting, required document markers, and the approved documentation field.

Compare 6 commands from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/DailybotHQ/deepworkplan-skill
agentmods
npx agentmods add commands/dailybothq/deepworkplan-skill/validate-frontmatter

Made for: Claude Code.

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 validate-frontmatter

README.md
[![agentmods](https://agentmods.dev/badge/commands/dailybothq/deepworkplan-skill/validate-frontmatter/github.svg)](https://agentmods.dev/commands/dailybothq/deepworkplan-skill/validate-frontmatter)
Your own site
<a href="https://agentmods.dev/commands/dailybothq/deepworkplan-skill/validate-frontmatter"><img src="https://agentmods.dev/badge/commands/dailybothq/deepworkplan-skill/validate-frontmatter/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 validate-frontmatter

Your own site · 80×15
<a href="https://agentmods.dev/commands/dailybothq/deepworkplan-skill/validate-frontmatter"><img src="https://agentmods.dev/badge/commands/dailybothq/deepworkplan-skill/validate-frontmatter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 261 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00018 $0.00261
Opus 5.5 $0.00007 $0.00104
Sonnet 5.5 $0.00004 $0.00052
Haiku 4.5 $0.00002 $0.00026

Measured 1mo ago against content hash 3612c8d9d23d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

validate-frontmatter 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.

.agents/commands/validate-frontmatter.md · 28 lines

What it actually says

/validate-frontmatter

Run this repo's frontmatter validator — the same check CI enforces on every PR.

What to do

  1. From the repo root, run:

    python3 scripts/validate-frontmatter.py
    
  2. The validator scans every SKILL.md under skills/ (router + sub-skills + addon) and fails if any violates the conventions in AGENTS.md:

    • name: is kebab-case and starts with deepworkplan
    • version: is a quoted SemVer string
    • the legacy homepage: key is absent (use documentation_url:)
    • frontmatter is delimited by --- markers
  3. On failure, fix the offending SKILL.md frontmatter and re-run until clean. Do not hand-edit version: to "fix" a check — the auto-release bot owns version numbers (see AGENTS.md §4). If the validator flags an unquoted or malformed version, fix the quoting/format, not the number.

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. 1mo ago First seen · 28 lines · 18 tokens per session scan A 3612c8d9d23d

Subscribe to this mod's changes

validate-frontmatter is a command published in the GitHub repository DailybotHQ/deepworkplan-skill (23 stars, last pushed 3d ago), licensed MIT. It adds 18 tokens to every session and 261 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.