Agent skill

SEO Optimizer

by secondsky in secondsky/claude-skills

SEO optimization with keyword analysis, readability assessment, technical validation, content quality.

MITAuto-check passedMarketing & SEO

Install SEO Optimizer

skills CLI
$ npx skills add secondsky/claude-skills --skill seo-optimizer -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install secondsky/claude-skills seo-optimizer --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/secondsky/claude-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/seo-optimizer/skills/seo-optimizer .claude/skills/seo-optimizer && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
seo-optimizer
GitHub stars
227
Token cost
~1.6k tokens
SKILL.md length
576 words
Files
3 (incl. references)
Skills in repo
169
Repo updated
First seen
Licence
MIT

At a glance

SEO optimization with keyword analysis, readability assessment, technical validation, content quality.

  • Works in 6 steps: Target Keywords Analysis → Content Structure → Readability Metrics → …
  • Search rankings
  • SKILL.md covers Overview, When to Use, Core Analysis Areas and Priority Levels, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

SEO Optimizer is an agent skill from secondsky/claude-skills. SEO optimization with keyword analysis, readability assessment, technical validation, content quality. Use for search rankings, blog posts, content audits, or encountering keyword density, readability scores, meta tags, schema markup errors.

Its SKILL.md is about 1.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files, including reference files (for example `references/analysis-framework.md` and `references/output-templates.md`).

It sits in Marketing & SEO, covering Plain language and style rules, On-page SEO and Content marketing. The repository describes itself as: Production-ready skills for Claude Code CLI - Cloudflare, React, Tailwind v4, and AI integrations. The licence is MIT.

When your agent uses it

  • Search rankings
  • Encountering keyword density
  • Readability scores
  • Schema markup errors

Example prompts

  • “/seo-optimizer”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Target Keywords Analysis
  2. Content Structure
  3. Readability Metrics
  4. Technical SEO Elements
  5. Content Quality Assessment
  6. Provide Actionable Recommendations

What it can do on your machine

Read from SKILL.md and the folder at commit 8837836. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript and markdown).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

SEO Optimizer loads about 1.6k tokens when it runs, and up to ~8.9k if it reads all its reference files. Until then it costs about 64 tokens; SKILL.md has 576 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~64
When it runs · the whole SKILL.md, loaded when a task matches
~1.6k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~8.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from secondsky/claude-skills at commit 8837836, republished under its MIT licence (© secondsky). 576 words, ~1,596 tokens.

Download SKILL.mdSave it as .claude/skills/seo-optimizer/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.
name
seo-optimizer
description
SEO optimization with keyword analysis, readability assessment, technical validation, content quality. Use for search rankings, blog posts, content audits, or encountering keyword density, readability scores, meta tags, schema markup errors.
license
MIT

SEO Optimizer

Overview

Perform comprehensive SEO analysis and optimization covering keyword placement, readability metrics, technical elements, and content quality to improve search engine rankings and user experience.

When to Use

  • Optimizing blog posts or articles for search rankings
  • Conducting content audits
  • Improving existing content performance
  • Planning new content with SEO in mind
  • Analyzing competitor content strategies
  • Preparing content for publication

Core Analysis Areas

1. Target Keywords Analysis
  • Identify primary and secondary keywords
  • Check placement in title, H1, first 100 words, subheadings
  • Calculate keyword density (target: 1-2%)
  • Identify LSI keywords and semantic variations
  • Flag keyword stuffing issues
2. Content Structure
  • Verify heading hierarchy (H1 → H2 → H3)
  • Check keyword usage in headings
  • Evaluate paragraph length (target: <150 words)
  • Assess overall scannability
  • Review content organization
3. Readability Metrics
javascript
// Readability scoring example
const readabilityMetrics = {
  fleschScore: 65,           // Target: 60-70
  gradeLevel: 8,             // Target: 7-9
  avgSentenceLength: 18,     // Target: <20 words
  passiveVoice: 5,           // Target: <10%
  transitionWords: 30        // Target: >30%
};

Key Metrics:

  • Flesch Reading Ease score (60-70 ideal)
  • Grade level estimation
  • Average sentence length (<20 words)
  • Passive voice percentage (minimize)
  • Transition word usage
4. Technical SEO Elements
ElementRecommendation
Meta Title50-60 characters with primary keyword
Meta Description150-160 characters, compelling with keyword
URL SlugShort, keyword-rich, hyphen-separated
Image Alt TextDescriptive with natural keyword usage
Internal LinksLink to related content with keyword anchors
External LinksQuality outbound links to authoritative sources
5. Content Quality Assessment
  • Word count adequacy (1500+ for competitive topics)
  • Content depth and topic coverage
  • Unique value proposition
  • E-A-T signals (Expertise, Authority, Trustworthiness)
  • Content freshness (current examples, recent data)
  • Clear answer to user intent
6. Provide Actionable Recommendations

Organize findings into prioritized action items based on impact and implementation effort.

Priority Levels

Critical (Fix Immediately) 🚨
  • Missing or poor meta description
  • No keyword in title or H1
  • Broken internal links
  • Keyword density too high (stuffing) or too low
High Priority ⚠️
  • Poor readability score
  • Weak heading structure
  • Missing alt text on images
  • Content too thin for topic
Medium Priority 📋
  • Could add related keywords
  • Featured snippet opportunities
  • Additional internal linking
  • Schema markup opportunities

Analysis Report Structure

markdown
# SEO Analysis Report

## Overall Score: X/100

### Quick Wins 🚀
1. [Specific action with exact change]
2. [Specific action with exact change]

## Keyword Analysis
- Primary keyword density
- Placement verification
- LSI keyword coverage

## Readability Metrics
- Flesch Reading Ease: XX/100
- Grade Level: X
- Sentence length assessment

## Technical SEO
- Meta tags analysis
- URL optimization
- Image optimization

## Content Gaps
- Missing subtopics
- Coverage recommendations
- Topic expansion opportunities

## Competitor Insights
- Top ranking pages analysis
- Word count comparison
- Unique angles they cover
- Our competitive advantage

## Implementation Checklist
- [ ] Action item 1
- [ ] Action item 2

## Estimated Impact
- **Time to Implement**: X hours
- **Expected Improvement**: [Moderate/Significant] ranking boost
- **Priority**: [High/Medium/Low]
- **Timeframe**: [Weeks until results]

Best Practices

  • User experience first: Prioritize readability and value over keyword density
  • Write for humans: Optimize for search engines second
  • Be specific: Provide exact changes, not vague suggestions
  • Consider intent: Match content to search intent (informational, commercial, transactional)
  • E-A-T signals: Include author credentials, sources, and expertise indicators
  • Featured snippets: Format content for definition boxes, lists, tables
  • Schema markup: Suggest structured data (FAQ, How-To, Review) where relevant
Show full SKILL.md (198 more words)Show less

Example Analysis Flow

  1. Identify keywords → Extract from user input or content
  2. Check placement → Verify in title, H1, first 100 words
  3. Calculate density → Ensure 1-2% keyword density
  4. Assess readability → Calculate Flesch score and sentence length
  5. Review structure → Check heading hierarchy and paragraph length
  6. Analyze technical → Validate meta tags, URLs, alt text
  7. Find gaps → Identify missing topics and internal links
  8. Prioritize fixes → Sort by impact (critical > high > medium)
  9. Generate checklist → Create actionable implementation steps

Output Guidelines

  • Provide specific recommendations with exact text changes
  • Show before/after examples for clarity
  • Include keyword variations naturally in suggestions
  • Estimate time to implement and expected impact
  • Format for easy scanning with headings and lists
  • Add context explaining why changes matter

Additional Resources

See references/analysis-framework.md for:

  • Detailed analysis instructions for each area
  • Technical specifications and formulas
  • Competitor analysis guidelines
  • E-A-T evaluation criteria

See references/output-templates.md for:

  • Complete SEO report template
  • Implementation checklist format
  • Example workflow with sample content
  • Featured snippet optimization templates

Core Philosophy

"SEO is about creating valuable, well-optimized content that serves user intent better than competitors."

Focus on genuine value creation, not manipulation tactics. Quality content that helps users naturally attracts engagement signals that improve rankings.

© secondsky, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files (references) in plugins/seo-optimizer/skills/seo-optimizer of secondsky/claude-skills.

  • SKILL.md
  • references/analysis-framework.md
  • references/output-templates.md

Open the folder on GitHubat commit 8837836

Compare with similar skills

SEO Optimizer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

SEO Optimizer compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
SEO Optimizer this skillsecondsky/claude-skills227—~1.6kAutomated safety check: PassMIT
SEO Geoericrisco/rsc-harness156—~2.8kAutomated safety check: PassMIT
Content SEOjdevalk/skills104—~2.3kAutomated safety check: PassMIT
SEOgridaco/grida2.7k—~2.1kAutomated safety check: PassApache-2.0
SEO ContentAgriciDaniel/codex-seo7875 repos~2.3kAutomated safety check: PassMIT
Article Writingericrisco/rsc-harness156—~2.9kAutomated safety check: PassMIT

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Questions about SEO Optimizer

What does SEO Optimizer do?

SEO optimization with keyword analysis, readability assessment, technical validation, content quality. SEO Optimizer is an agent skill from secondsky/claude-skills. SEO optimization with keyword analysis, readability assessment, technical validation, content quality.

When should I use SEO Optimizer?

SEO Optimizer fits situations like: search rankings; encountering keyword density; readability scores; schema markup errors.

How do I install SEO Optimizer in Claude Code?

Run `npx skills add secondsky/claude-skills --skill seo-optimizer -a claude-code`. Or copy the skill folder (plugins/seo-optimizer/skills/seo-optimizer in secondsky/claude-skills) into .claude/skills/seo-optimizer in your project. Claude Code loads it when a task matches its description.

How do I install SEO Optimizer in Codex?

Run `npx skills add secondsky/claude-skills --skill seo-optimizer -a codex`. Or copy the skill folder (plugins/seo-optimizer/skills/seo-optimizer in secondsky/claude-skills) into .agents/skills/seo-optimizer in your project. Codex loads it when a task matches its description.

Can I use SEO Optimizer in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add secondsky/claude-skills --skill seo-optimizer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/seo-optimizer, .gemini/skills/seo-optimizer, .github/skills/seo-optimizer and .opencode/skills/seo-optimizer in your project.

What does SEO Optimizer need to run?

SKILL.md names no scripts, command-line tools or credentials: SEO Optimizer is instructions for the agent only.

Does SEO Optimizer access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is SEO Optimizer safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does SEO Optimizer use?

SEO Optimizer is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does SEO Optimizer use?

About 1.6k tokens (SKILL.md is roughly 6.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.3k tokens, read only when the agent opens those files.

What are the alternatives to SEO Optimizer?

Skills that share tags, products or a category with SEO Optimizer: SEO Geo (ericrisco/rsc-harness, 156 stars), Content SEO (jdevalk/skills, 104 stars), SEO (gridaco/grida, 2.7k stars) and SEO Content (AgriciDaniel/codex-seo, 787 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains SEO Optimizer?

secondsky (a GitHub user) maintains it in secondsky/claude-skills, which has 227 GitHub stars. The repository holds 169 skills in this directory. The repository was last updated on September 28, 2026.

Source: secondsky/claude-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.