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SEO Sitemap Skill for Claude

by seranking

Pull a domain's XML sitemap (and sitemap-of-sitemaps), then compare against the most recent SE Ranking website audit. Surfaces (a) sitemap entries the crawler couldn't find (orphans from the sitemap), (b) audit pages missing from the sitemap (probably an oversight), (c) sitemap entries that are now 404, (d) lastmod inconsistencies. Use when the user asks for "sitemap analysis", "check my sitemap", "sitemap vs audit", "missing pages", "orphan pages", or "sitemap health".

2k tokens
context cost
the whole folder, loaded on every use
1
files
instructions only
0
copies elsewhere
how many repositories repackaged it
108
stars on the repo
on the repository, not the skill itself

Install

one command, takes just this skill from the repository 
npx skills add https://github.com/seranking/seo-skills --skill seo-sitemap

What it tells the agent to use

found in the instruction text
WebFetch fetches pages from the network

The instruction itself

5 sections, as written by the author

> Example output: examples/seo-sitemap-notion-so-20260514/SITEMAP.md

Sitemap Analysis

Compare a domain's XML sitemap against the most recent SE Ranking website audit. Surface what the sitemap claims vs what the crawler actually found, in both directions.

Prerequisites

  • SE Ranking MCP server connected.
  • Claude's WebFetch tool available.
  • User provides: a target domain. Optional: the sitemap URL if not at /sitemap.xml (auto-discovery from robots.txt is attempted first).
  • Predecessor: seo-technical-audit (or any prior SE Ranking audit) on this domain. Without an existing audit, this skill has nothing to compare against — chain seo-technical-audit first.

Process

  • Validate target & confirm audit
  • Normalise the domain.
  • DATA_listAudits → confirm an audit exists for this domain. If none, surface a clear message: "Run seo-technical-audit first; this skill compares the sitemap to that audit's crawl."
  • Use the most recent done audit by default.
  • Firecrawl availability check. If mcp__firecrawl-mcp__firecrawl_map is available, Mode-2 (URL discovery via crawl) is offered when the sitemap is missing or suspect. Cost: ~0.5 Firecrawl credits per URL discovered, hard cap 500 URLs (~250 credits). Without Firecrawl, the skill runs Mode-1 only and notes the gap if Mode-2 was needed. User may pass --no-firecrawl to force Mode-1 even when Firecrawl is available (saves credits at the cost of orphan/missing analysis when sitemap is broken).
  • Build URL lists WebFetch (sitemap) + mcp__firecrawl-mcp__firecrawl_map (optional Mode-2)
  • Mode-1 (default). Try https://{domain}/sitemap.xml. If 404, fetch /robots.txt and look for Sitemap: directives. For sitemap-of-sitemaps, recursively fetch each child sitemap. Build the canonical URL list from the sitemap.
  • Mode-2 trigger. Switch on Mode-2 when (a) no sitemap is reachable, (b) the sitemap returns < 10% of the audit's DATA_getCrawledPages count, or (c) the user explicitly requests --discover. Always surface the trigger and the cost estimate to the user before running Mode-2.
  • Mode-2 execution (requires Firecrawl): call firecrawl_map(url=domain, limit=500). The response is the URL list Firecrawl could discover from the homepage and internal linking. Use this list as the "sitemap-equivalent" in step 6 — the diffs run identically, just with discovered URLs in place of declared sitemap URLs.
  • If Mode-2 is needed but Firecrawl is unavailable: continue with whatever sitemap data Mode-1 returned (possibly empty). Surface clearly in SITEMAP.md: Mode-2 (Firecrawl URL discovery) needed but Firecrawl not installed — sitemap-vs-audit diffs run on partial data only.
  • Pull the audit's crawled pages DATA_getCrawledPages
  • All URLs the crawler found, with status codes, indexability flags, depth.
  • Pull domain pages DATA_getDomainPages
  • Domain-level page inventory (broader than the audit's crawl scope in some cases).
  • Pull orphan-page issues DATA_getAuditPagesByIssue
  • Filter for orphan-page and depth-related issues. These intersect with sitemap analysis.
  • Compute the four diffs
  • Missing from sitemap: URLs in DATA_getCrawledPages (status 200, indexable) that don't appear in the sitemap. Probably should be added.
  • Orphans from sitemap: URLs in the sitemap that the crawler didn't find via internal links (cross-ref DATA_getAuditPagesByIssue orphan flags). The sitemap is the only thing pointing at them — investigate whether they should be linked internally.
  • Broken sitemap entries: sitemap URLs that returned non-200 in the audit's crawl. Remove from sitemap or fix the URL.
  • Lastmod issues: sitemap entries where (a) all <lastmod> dates are identical (lazy generation) or (b) <lastmod> is older than the audit's crawl date for the page even though the page changed (stale).
  • Validation
  • URL count <50,000 per file (sitemap protocol limit). Flag if exceeded.
  • Sitemap referenced in robots.txt.
  • Encoding: each URL is XML-safe (ampersands escaped, etc.).
  • HTTPS consistency: sitemap URLs match the canonical protocol.
  • <lastmod> is the only optional tag Google still consumes. Validate it (step 6). <priority> and <changefreq> have been explicitly ignored by Google for years (per Google's sitemap docs — "Google ignores priority and changefreq values"). Don't validate them; if present, flag as low-signal noise the user can strip to shrink the sitemap.
  • Synthesise SITEMAP.md

Output format

Create a folder seo-sitemap-{target-slug}-{YYYYMMDD}/ with:

seo-sitemap-{target-slug}-{YYYYMMDD}/
├── SITEMAP.md                       (synthesised report — primary deliverable)
├── recommended-sitemap-diff.md      (proposed changes: add X, remove Y — load-bearing artefact engineering applies to sitemap.xml)
└── evidence/
    └── source-data.md               (consolidated raw step output: fetched sitemap content, Firecrawl-discovered URLs if Mode-2 ran, audit's crawled-pages list, the four diffs (missing/orphans/broken/lastmod-issues) — preserved for reproducibility)

Top-level: SITEMAP.md + recommended-sitemap-diff.md. The seven raw step files (01-sitemap-raw, 01b-firecrawl-discovered, 02-audit-pages, 03-missing-from-sitemap, 04-orphans-from-sitemap, 05-broken-entries, 06-lastmod-issues) are consolidated into a single evidence/source-data.md document with the same per-step section headers — a reader who needs to replay the diff has all raw inputs in one file rather than seven.

SITEMAP.md follows this shape:

# Sitemap Analysis: {domain}

> Sitemap pulled {YYYY-MM-DD} · Audit reference {audit-date}

## Mode

- **Mode-1 (sitemap-vs-audit):** {ran / skipped — no sitemap reachable}
- **Mode-2 (Firecrawl URL discovery):** {ran with {n} URLs / not triggered / triggered but Firecrawl not installed}

## Health summary

| Metric | Value | Status |
|---|---|---|
| Sitemap URLs (Mode-1) | {n} | — |
| Discovered URLs (Mode-2, if ran) | {n} | — |
| Audit crawled URLs (200, indexable) | {n} | — |
| Missing from sitemap (probable adds) | {n} | {🔴 if >5%} |
| Orphans from sitemap (probable cuts or link-ins) | {n} | {🟡 if >5} |
| Broken sitemap entries (non-200) | {n} | {🔴 if >0} |
| Lastmod issues | {n} | {🟡 if uniform; 🔴 if stale} |

## Recommended changes

### Add to sitemap ({n} URLs)
- {URL} — found by crawler at depth {n}, status 200, indexable.
- ...

### Remove from sitemap ({n} URLs)
- {URL} — returns {status code}.
- ...

### Investigate (orphan from sitemap, {n} URLs)
- {URL} — in sitemap but not reachable via internal links. Either link from {suggested parent} or remove from sitemap.
- ...

### Fix lastmod ({n} URLs)
- {URL} — lastmod is {date} but the audit crawled the page on {date} and detected changes since.
- ...

## Validation

- Total URL count: {n} ({✓ under 50k limit | ✗ exceeds — split into sitemap-of-sitemaps})
- Referenced in robots.txt: {✓/✗}
- HTTPS consistency: {✓/✗}
- Encoding: {✓/✗}

## Apply
- See `recommended-sitemap-diff.md` for the proposed sitemap.xml changes.
- After applying, re-run `seo-technical-audit` to refresh the crawl, then re-run this skill to verify.

Tips

  • Run seo-technical-audit first. Without an audit, this skill has nothing to compare.
  • Re-run after deploys that change page inventory (new content, removed pages, URL restructures).
  • Sitemap-of-sitemaps fan-out can be large for big sites — the skill recursively fetches all child sitemaps. For sites with 50+ child sitemaps, fetching dominates runtime; not credit cost.
  • <priority> and <changefreq> are dead signals — Google explicitly ignores both. Don't waste time tuning them; if your sitemap generator emits them, the bytes are pure overhead. <lastmod> is still consumed, so keep that one accurate.
  • The "investigate orphans" list is often the highest-leverage finding — pages that exist but aren't linked are usually accidentally orphaned, and adding a couple of internal links can revive them.
  • Pair with seo-drift to track sitemap composition over time (URL count, lastmod patterns).
  • Cost: ~5–10 SE Ranking credits typical (mostly the getCrawledPages and getDomainPages calls). Mode-2 adds Firecrawl credits at ~0.5 per discovered URL — surface the estimate before triggering.

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How to use it

Copy the folder

Take seranking/seo-sitemap from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.