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 01clauding/claude-seo-skill --skill seo-performancegit clone --depth 1 https://github.com/01clauding/claude-seo-skillWrote 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/01clauding/claude-seo-skill/seo-performance)<a href="https://agentmods.dev/skills/01clauding/claude-seo-skill/seo-performance"><img src="https://agentmods.dev/badge/skills/01clauding/claude-seo-skill/seo-performance.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00086 | $0.01648 |
| Opus 5 | $0.00043 | $0.00824 |
| Sonnet 5 | $0.00017 | $0.00330 |
| Haiku 4.5 | $0.00009 | $0.00165 |
Grade A, and why
seo-performance scanned grade A with 1 finding 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 8d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sI --http3 https://example.com | grep -i "HTTP/3" How it starts
The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
seo-performance — Core Web Vitals & Page Performance
Core Web Vitals Thresholds (2026)
| Metric | Good | Needs Improvement | Poor |
|---|---|---|---|
| LCP (Largest Contentful Paint) | ≤2.5s | 2.5s–4.0s | >4.0s |
| INP (Interaction to Next Paint) | ≤200ms | 200ms–500ms | >500ms |
| CLS (Cumulative Layout Shift) | ≤0.1 | 0.1–0.25 | >0.25 |
INP replaced FID on March 12, 2024. FID fully removed September 9, 2024. Never reference FID.
Key Statistics (2026)
- 77% of mobile pages now achieve "good" INP (up from 55% in 2022)
- 57.1% desktop / 49.7% mobile pass all three CWV (Oct 2025)
- December 2025 core update: Mobile CWV weighted more heavily in ranking calculations
- CWV evaluated at 75th percentile of field data — 75% of visits must meet "good"
HTTP/3 & QUIC Analysis
HTTP/3 reached 35% global adoption (2025), reducing mobile latency by 30%.
Check HTTP/3 Support
curl -sI --http3 https://example.com | grep -i "HTTP/3"
# Or check via headers:
curl -sI https://example.com | grep -i "alt-svc"
HTTP/3 Scoring
| Status | Score | Recommendation |
|---|---|---|
| HTTP/3 enabled (Alt-Svc header present) | 100 | Excellent |
| HTTP/2 only | 50 | Enable HTTP/3 at CDN level (Cloudflare: default, AWS CloudFront: opt-in) |
| HTTP/1.1 | 0 | Upgrade immediately — significant performance penalty |
HTTP/3 is NOT a direct ranking factor but improves TTFB and LCP subparts measurably.
LCP Subpart Diagnostics (Feb 2025 CrUX Addition)
Break down LCP into 4 subparts for targeted optimization:
| Subpart | What It Measures | Target |
|---|---|---|
| TTFB | Server response time | <800ms |
| Resource Load Delay | Time before LCP resource starts loading | Minimize (preload) |
| Resource Load Time | Time to download LCP resource | Compress, CDN, modern formats |
| Element Render Delay | Time from resource loaded to rendered | Reduce render-blocking CSS/JS |
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.
- 8d ago First seen · 156 lines · 86 tokens per session scan A 926de2da3be0
seo-performance is a skill published in the GitHub repository 01clauding/claude-seo-skill (4 stars, last pushed 5mo ago), licensed MIT. It adds 86 tokens to every session and 1,648 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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