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 lionkiii/claude-seo-skills --skill seo-migration-checkgit clone --depth 1 https://github.com/lionkiii/claude-seo-skillsWrote 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/lionkiii/claude-seo-skills/seo-migration-check)<a href="https://agentmods.dev/skills/lionkiii/claude-seo-skills/seo-migration-check"><img src="https://agentmods.dev/badge/skills/lionkiii/claude-seo-skills/seo-migration-check/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/lionkiii/claude-seo-skills/seo-migration-check"><img src="https://agentmods.dev/badge/skills/lionkiii/claude-seo-skills/seo-migration-check.svg" alt="Reviewed on agentmods" width="80" 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 | $0.01097 |
| Opus 5 | $0.00043 | $0.00549 |
| Sonnet 5 | $0.00017 | $0.00219 |
| Haiku 4.5 | $0.00009 | $0.00110 |
Grade A, and why
seo-migration-check 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 12d 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 — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Site Migration SEO Validator
Validates redirect chains, canonical tags, metadata, and content preservation during site migrations.
Inputs
Either:
oldandnew: Two URLs for a single-page check (e.g.,https://old.com/pagehttps://new.com/page)file: Path to CSV/text file with URL pairs, one per line:old_url,new_url
If file provided: Read it and process each line. Skip blank lines and lines starting with #.
For large files (>50 URL pairs), process first 50 and note truncation.
Execution
For each URL pair, run checks a-f:
Check a: Redirect Chain Validation
Fetch old URL with WebFetch and follow redirects (track each hop):
- Record redirect type: 301 (permanent), 302 (temporary), 307, 308
- Count redirect hops
- Record final destination URL
Evaluate:
- Final destination matches expected
newURL: PASS — mismatch: FAIL - Redirect type is 301: PASS — 302/307: WARN (temporary redirects pass less link equity)
- Hop count 1: PASS — hop count 2: WARN — hop count >2: FAIL (redirect chain too long)
- Direct 200 on old URL (no redirect): FAIL (old page still live, not redirected)
Check b: Canonical Consistency
Fetch new URL, extract <link rel="canonical" href="..."> from <head>.
- Canonical matches new URL exactly: PASS
- Canonical missing: WARN (Google will infer, but explicit is better)
- Canonical points to old URL: FAIL (critical — tells Google old is authoritative)
- Canonical points to third URL: WARN
Check c: Title and Meta Preservation
Compare title and meta description between old URL (before redirect) and new URL. Note: old URL may already redirect, so if old URL is not directly fetchable, skip comparison and note.
If comparable:
- Title: Extract both. Compare word overlap.
-
70% word overlap: PASS
- 40-70% overlap: WARN (may be intentional change)
- <40% overlap: WARN with note ("significant title change — verify this was intentional")
-
- Meta description: Extract both.
- Present on both: PASS
- Missing on new URL: WARN
- Both missing: NOTE
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.
- 12d ago First seen · 139 lines · 86 tokens per session scan A 8f01fc63233c
seo-migration-check is a skill published in the GitHub repository lionkiii/claude-seo-skills (20 stars, last pushed 3mo ago), licensed MIT. It adds 86 tokens to every session and 1,097 once invoked, about $0.0004 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 2026-08-30.
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