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.
npx skills add Kevin-Liu-01/Agent-Machines --skill og-metadata-auditgit clone --depth 1 https://github.com/Kevin-Liu-01/Agent-MachinesWrote 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.
[](https://agentmods.dev/skills/kevin-liu-01/agent-machines/og-metadata-audit)<a href="https://agentmods.dev/skills/kevin-liu-01/agent-machines/og-metadata-audit"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/og-metadata-audit/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.
<a href="https://agentmods.dev/skills/kevin-liu-01/agent-machines/og-metadata-audit"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/og-metadata-audit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00098 | $0.01767 |
| Opus 5 | $0.00049 | $0.00883 |
| Sonnet 5 | $0.00020 | $0.00353 |
| Haiku 4.5 | $0.00010 | $0.00177 |
Grade A, and why
og-metadata-audit 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 223 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OG Metadata Audit
Audit Steps
1. Inventory all metadata exports
Find every file exporting metadata or generateMetadata:
grep -r "export const metadata" --include="*.tsx" --include="*.ts"
grep -r "export async function generateMetadata" --include="*.tsx" --include="*.ts"
For each, record: file path, fields present, fields missing.
2. Check root layout
The root app/layout.tsx metadata must include:
| Field | Required | Notes |
|---|---|---|
metadataBase |
Yes | Absolute URL. Resolves all relative image paths. |
title.default + title.template |
Yes | Template applies to child pages. |
description |
Yes | |
openGraph |
Yes | With images, siteName, locale, type, url. |
twitter |
Yes | With card, site, creator, title, description, images. |
robots |
Yes | Include googleBot.max-image-preview: "large" for full-size social cards. |
alternates.canonical |
Yes | Root canonical URL. |
category |
Optional | e.g. "technology". |
3. Check child pages
Every public page needs its own alternates.canonical pointing to its path,
not inheriting the root /. Pages that only set title and description
silently inherit the root canonical, which is wrong for SEO.
4. Check middleware
Next.js middleware must be in a file named middleware.ts (or .js) at the
project root, exporting a function named middleware (or a default export).
Common failure: file named proxy.ts or function named proxy — Next.js
silently ignores both.
If the project intercepts social bots (Twitterbot, facebookexternalhit, etc.) in middleware, verify:
- The file is
middleware.ts - The export is
middlewareordefault - The matcher doesn't exclude the routes bots need
- Bot HTML includes all required meta tags (see checklist below)
5. Check OG image route
If using next/og ImageResponse:
- Route returns
Content-Type: image/png - Image is 1200x630
Cache-Controlheaders are set- The footer/branding matches the current domain
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.
- 9d ago First seen · 223 lines · 98 tokens per session scan A 7819ebf3ec81
og-metadata-audit is a skill published in the GitHub repository Kevin-Liu-01/Agent-Machines (29 stars, last pushed today), licensed MIT. It adds 98 tokens to every session and 1,767 once invoked, about $0.0005 per session on Opus 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 2026-09-03.
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