astrodeck: Skill for Claude Code

.claude/skills/content-seo/SKILL.md

content-seo is a skill for Claude Code from holger1411/astrodeck. It costs 31 tokens per session (1,238 once invoked), scanned A, original, MIT.

A content and search-visibility guide for Astro websites. It covers page content, metadata, social-sharing details, structured data, RSS feeds, and sitemaps.

In plain words
What is it for?
Use it when creating or editing pages, blog posts, or content files, or when adding metadata. It is also for investigating a Lighthouse SEO score below 90; Lighthouse is a tool that audits website quality, including search visibility.
Why use it?
It helps prevent missing page descriptions, social preview images, and other details that search engines and social networks use. It also provides checks for measuring search-visibility quality.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is holger1411/astrodeck's own configuration. It tells Claude Code how to work on astrodeck itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything astrodeck configures →

Reuse

Borrowing it

Nothing to install: this file belongs to holger1411/astrodeck. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/holger1411/astrodeck/main/.claude/skills/content-seo/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/holger1411/astrodeck

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 content-seo

README.md
[![agentmods](https://agentmods.dev/badge/skills/holger1411/astrodeck/content-seo/github.svg)](https://agentmods.dev/skills/holger1411/astrodeck/content-seo)
Your own site
<a href="https://agentmods.dev/skills/holger1411/astrodeck/content-seo"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/content-seo/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 content-seo

Your own site · 80×15
<a href="https://agentmods.dev/skills/holger1411/astrodeck/content-seo"><img src="https://agentmods.dev/badge/skills/holger1411/astrodeck/content-seo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,238 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00031 $0.01238
Opus 5.5 $0.00012 $0.00495
Sonnet 5.5 $0.00006 $0.00248
Haiku 4.5 $0.00003 $0.00124

Measured 2mo ago against content hash 8a11dda3ebb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

content-seo 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 2mo 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.

.claude/skills/content-seo/SKILL.md · 182 lines

How it starts

The opening of the file, as written. The whole thing — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Content & SEO Skill

Canonical Sources

This skill references the following globals — read them BEFORE starting work:

  • system/globals/imagery.md — Alt text conventions, image formats

Domain

Content Collections, Meta Tags, OpenGraph, Structured Data, RSS, Sitemap

KPIs

Metric Target Measurement
Lighthouse SEO >90 Lighthouse JSON → categories.seo.score * 100
Pages without Description 0 npm run check:kpis
Pages without OG-Image 0 HTML check in dist/

Rules

Content Collections Schema

// src/content.config.ts
import { defineCollection } from 'astro:content';
import { z } from 'astro/zod';
import { glob } from 'astro/loaders';

const blog = defineCollection({
  loader: glob({ pattern: '**/*.{md,mdx}', base: './src/content/blog' }),
  schema: z.object({
    title: z.string(),
    description: z.string().max(160),
    pubDate: z.coerce.date(),
    updatedDate: z.coerce.date().optional(),
    heroImage: z.string().optional(),
    draft: z.boolean().default(false),
    tags: z.array(z.string()).default([]),
    author: z.string().default('Team'),
  }),
});

SEO Component Usage

---
import BaseLayout from '@/layouts/BaseLayout.astro';

const title = "Page Title — Brand Name";
const description = "Page description, 150-160 characters, relevant keyword at the start.";
---

<BaseLayout title={title} description={description}>
  <!-- Content -->
</BaseLayout>

Meta-Description Best Practices

  • Length: 150-160 characters (Google truncates at ~160)
  • Keyword: Relevant keyword at the beginning
  • Unique: Every page needs its own description
  • Actionable: Call-to-action or value proposition
  • No duplicates: Never the same description for multiple pages

OpenGraph Tags

<meta property="og:title" content="{title}" />
<meta property="og:description" content="{description}" />
<meta property="og:image" content="{siteUrl}/og-image.png" />
<meta property="og:url" content="{canonicalUrl}" />
<meta property="og:type" content="website" />
<meta property="og:site_name" content="{siteName}" />

Read the full file on GitHub · 182 lines

Files

What ships with it

1 file 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. 2mo ago First seen · 182 lines · 31 tokens per session scan A 8a11dda3ebb7

Subscribe to this mod's changes

content-seo is a skill published in the GitHub repository holger1411/astrodeck (81 stars, last pushed 2mo ago), licensed MIT. It adds 31 tokens to every session and 1,238 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.

Related

content-seo compared with skills from other repositories

content-seo next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
content-seoholger1411/astrodeckSkill812mo agoMITA31Claude Code
imagegenopenai/codexSkill133kyesterdayApache-2.0A113Codex
playwright-climicrosoft/playwrightSkill99kyesterdayApache-2.0A19Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginnersSkill79k4d agoMITA200Claude Code, Codex
systematic-debuggingobra/superpowersSkill313k3d agoMITA21Claude Code
next-cache-components-adoptionvercel/next.jsSkill143ktodayMITA95Claude Code
next-partial-prefetching-adoptionvercel/next.jsSkill143ktodayMITA103Claude Code