SEO Audit Skill: Script+LLM Two-Layer Architecture Deep Analysis
SEO Audit Skill: A Deep Analysis of the Script+LLM Two-Layer Architecture
Today, we're taking a close look at seo-audit-skill by JeffLi1993—a practical SEO auditing tool that stands out for its elegant two-layer architecture design.
What Is It?
seo-audit-skill is a reusable agent skill for single-page SEO auditing. Give it a URL, and it generates a structured HTML report with actionable findings. It works with Claude Code, Cursor, and any agent runtime that supports SKILL.md.
Why We Rated It A-Grade (8.65/10)
| Dimension | Score | Weight | Key Points |
|---|---|---|---|
| Structural Integrity | 9.0 | 15% | Dual-tier structure (seo-audit + seo-audit-full), complete SKILL.md + REFERENCE.md + scripts + templates |
| Instruction Clarity | 8.5 | 20% | Clear two-layer architecture explanation, 20+ checks in tabular format |
| Practicality | 9.0 | 25% | Solves real pain points, delivers usable HTML reports, Basic/Full versions for different scenarios |
| Reproducibility | 8.5 | 10% | Python scripts ensure deterministic checks, structured JSON output, LLM intervenes only when necessary |
| Professional Depth | 8.5 | 20% | Covers RFC 9309, Core Web Vitals, E-E-A-T, BCP 47, and other professional standards |
| Differentiation | 8.0 | 10% | Script+LLM two-layer architecture is a highlight, but SEO audit tools are common |
The Architecture That Makes It Special
Layer 1: Python Scripts → Deterministic checks (HTTP status, XML parsing, string matching) Layer 2: LLM Agent → Semantic judgment (keyword intent, content quality, page type inference)
This design is clever: scripts handle the 80% deterministic stuff, while the LLM handles the 20% that requires understanding. The llm_review_required flag ensures the LLM only intervenes when the script explicitly cannot make the call. No hallucination on factual checks, no blind spots on semantic ones.
Feature Comparison: Basic vs Full
| Check Category | Basic | Full |
|---|---|---|
| robots.txt (RFC 9309 parsing) | ✅ | ✅ |
| sitemap.xml validation | ✅ | ✅ |
| URL Canonicalization | ✅ | ✅ |
| PageSpeed Insights | ✅ | ✅ |
| Schema (JSON-LD) | ✅ | ✅ |
| GSC Crawl Status | — | ✅ |
| Core Web Vitals | — | ✅ |
| Content Quality Analysis | — | ✅ |
| Competitor Gap Analysis | — | ✅ |
How It Compares to Similar Tools
| Tool | Downloads | Architecture | Output | Best For |
|---|---|---|---|---|
| seo-audit-skill | New | Script + LLM dual-layer | HTML Report | Quick audits with professional reports |
| claude-seo | 3,698 | 19 sub-skills + 12 sub-agents | Multi-format | Deep analysis with extensions |
| sk-seo | 1,585 | Single agent | Text suggestions | General SEO tasks |
| marketingskills | 17,974 | Skill collection | Various | Complete marketing toolkit |
When to Use Which
- Quick SEO check → seo-audit-skill (Basic) – 20+ checks covering major issues
- Deep technical audit → seo-audit-skill (Full) – adds Core Web Vitals, content quality analysis
- Client deliverable report → seo-audit-skill (Full) – HTML report looks professional
- Complex SEO strategy → claude-seo – 19 sub-skills for comprehensive analysis
- Complete marketing → marketingskills – 23 marketing modules including SEO
Installation
npx skills add JeffLi1993/seo-audit-skill # Or install specific tier npx skills add JeffLi1993/seo-audit-skill --skill seo-audit npx skills add JeffLi1993/seo-audit-skill --skill seo-audit-full
Usage Example
audit this page: https://openclaw.ai → ✅ Report saved → reports/openclaw-ai-audit.html
Conclusion
seo-audit-skill earns its A-grade rating through thoughtful architecture and practical output. The Script+LLM two-layer design is particularly noteworthy—it demonstrates how to leverage both deterministic computation and semantic understanding without either becoming a liability.
For teams that need quick, professional SEO audits without the complexity of a full SEO platform, this skill hits the sweet spot.
Published on SkillsAgent Blog. Find more skills at skillsagent.org