missing-required

missing-required is a skill for Claude Code, Codex from charliechenye/SkillGate. It costs 0 tokens per session (12 once invoked), scanned A, original, MIT.

A skill whose metadata says that required frontmatter is missing; frontmatter is the structured information at the start of a configuration file.

In plain words
What is it for?
Use it as a test fixture for detecting or handling missing skill metadata.
Why use it?
It can help check how the framework handles a skill that lacks required metadata.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/charliechenye/skillgate/missing-required
Any agent
npx skills add charliechenye/SkillGate --skill missing-required
Clone the repo
git clone --depth 1 https://github.com/charliechenye/SkillGate

Made for: Claude Code, 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 missing-required

README.md
[![agentmods](https://agentmods.dev/badge/skills/charliechenye/skillgate/missing-required.svg)](https://agentmods.dev/skills/charliechenye/skillgate/missing-required)
Your own site
<a href="https://agentmods.dev/skills/charliechenye/skillgate/missing-required"><img src="https://agentmods.dev/badge/skills/charliechenye/skillgate/missing-required.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.00012
Opus 5 $0.00000 $0.00006
Sonnet 5 $0.00000 $0.00002
Haiku 4.5 $0.00000 $0.00001

Measured 4d ago against content hash 3978ae684c44, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

missing-required 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 4d 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.

fixtures/skills-validation/missing-required/SKILL.md · 2 lines

What it actually says

This skill has no frontmatter and therefore no required metadata.

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. 4d ago First seen · 2 lines · 0 tokens per session scan A 3978ae684c44

Subscribe to this mod's changes

missing-required is a skill published in the GitHub repository charliechenye/SkillGate (2 stars, last pushed 15d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 12 tokens. 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 2026-08-31.