agentmods.dev

validate-frontmatter

validate-frontmatter is a skill for Codex from coalesce-labs/catalyst. It costs 111 tokens per session (636 once invoked), scanned A, original, no licence file.

A checker for the YAML metadata at the top of Catalyst plugin files. It compares skills and agents with the project's documented metadata rules, including required fields and which fields belong only to certain file types.

In plain words
What is it for?
Use it when editing plugin skills or agents to check required metadata, invocation settings, tool declarations, and fields that must not appear in the wrong file type.
Why use it?
It catches incorrectly labelled or structured plugin files before they cause loading, invocation, or documentation problems.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: installed under .agents/ (shared by several agents).

not rated 20repo changed 1mo ago A scan 111 tokens no licence archived

Good fit Use it when editing plugin skills or agents to check required metadata, invocation settings, tool declarations, and fields that must not appear in the wrong file type.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter
View source ↗ coalesce-labs/catalyst
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 coalesce-labs/catalyst --skill catalyst-meta-validate-frontmatter
Clone the repo
git clone --depth 1 https://github.com/coalesce-labs/catalyst

Made for: 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.

agentmods badge for validate-frontmatter

README.md
[![agentmods](https://agentmods.dev/badge/skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter/github.svg)](https://agentmods.dev/skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter)
Your own site
<a href="https://agentmods.dev/skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter"><img src="https://agentmods.dev/badge/skills/coalesce-labs/catalyst/catalyst-meta-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/skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter"><img src="https://agentmods.dev/badge/skills/coalesce-labs/catalyst/catalyst-meta-validate-frontmatter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 111 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 636 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 unknown 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 $0.00111 $0.00636
Opus 5.5 $0.00044 $0.00254
Sonnet 5.5 $0.00022 $0.00127
Haiku 4.5 $0.00011 $0.00064

Measured 1mo ago against content hash 5f9161744a25, 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/skills/catalyst-meta-validate-frontmatter/SKILL.md · 28 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

3 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. 1mo ago Changed · -1 tokens per session 5f9161744a25
  2. 2mo ago First seen · 28 lines · 112 tokens per session scan A 6c6f9a579bf7

Subscribe to this mod's changes

validate-frontmatter is a skill published in the GitHub repository coalesce-labs/catalyst (20 stars, last pushed 1mo ago), with no licence file. It adds 111 tokens to every session and 636 once invoked, about $0.0004 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.

agent-memoryagentic-codingai-agentsai-codingclaude-code-commandsclaude-code-plugin
Related

validate-frontmatter compared with skills from other repositories

validate-frontmatter next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
validate-frontmattercoalesce-labs/catalystSkill201mo agononeA111Codex
linked-intent-devjszmajda/lidSkill118todayMITA110Claude Code
update-lidjszmajda/lidSkill118todayMITA105Claude Code
lid-coachjszmajda/lidSkill118todayMITA117Claude Code
arrow-maintenancejszmajda/lidSkill118todayMITA85Claude Code
map-codebasejszmajda/lidSkill118todayMITA92Claude Code
review-depthjszmajda/lidSkill118todayMITA93Claude Code