AI Index + Access Layer Skill

Purpose

This skill audits the hard technical prerequisites for AI citation: being in the right index, being crawlable by AI agents, allowing content previews, and serving content in raw HTML. None of the content-level GEO work in this pack matters if these gates are closed. Run this audit FIRST, before skills/geo-citability/, skills/geo-fanout/, or any content strategy work.

Core Insight

ChatGPT's retrieval pipeline runs on the Bing index, not Google's: 87% of ChatGPT citations match Bing top results, and Google appears nowhere in the pipeline (SubscribePR analysis, Jul 2026). A site can rank #1 on Google and be completely invisible to ChatGPT if Bing has not indexed it. Bing Webmaster Tools verification + sitemap submission + IndexNow is therefore the ChatGPT entry ticket -- and it also unlocks Bing WMT's AI Performance / Copilot citation data, one of the few first-party AI-visibility datasets available.

Beyond indexation, three access gates silently kill AI visibility:

1. Crawler blocks -- robots.txt or CDN/WAF rules blocking OAI-SearchBot, GPTBot, ChatGPT-User, PerplexityBot, or ClaudeBot. ~27% of B2B sites accidentally block AI agents at the CDN level (⚠️ industry estimate -- verify before quoting publicly).
2. Preview restrictions -- legacy nosnippet or restrictive max-snippet directives suppress AI citations. Scored 9.2/10 as a citation factor (Zyppy meta-analysis of 54 studies via DigitalApplied, Jun 2026).
3. JavaScript-only content -- ChatGPT-User reportedly performs no JavaScript rendering (⚠️ single source, SubscribePR Jul 2026). Content that only exists after client-side rendering is invisible to it.

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Audit Checklist (Execute in Order)

Gate 1: Bing Indexation (ChatGPT Entry Ticket)

1. Check whether the site is verified in Bing Webmaster Tools. If not, that is the #1 finding -- verification + sitemap submission is the entry ticket.
2. Run site:example.com on Bing (WebFetch https://www.bing.com/search?q=site:example.com) and compare the indexed-page count against the sitemap count. A large gap = indexation problem.
3. Spot-check 5-10 money pages: is each one indexed on Bing?
4. Check whether IndexNow is implemented:
   • Look for an IndexNow key file at [domain]/[key].txt.
   • Check whether the CMS/build pipeline pings https://api.indexnow.org/indexnow (or the Bing equivalent) on publish/update.
   • If absent, recommend IndexNow integration -- it pushes new URLs to Bing (and other participating engines) at publish time instead of waiting for crawl.
5. Once verified, note that Bing WMT's AI Performance (Copilot) report becomes available -- first-party data on how often the site is cited in Copilot answers. This feeds skills/geo-measurement/.

Gate 2: AI Crawler Access (robots.txt + CDN)

Full crawler-by-crawler procedure lives in skills/geo-crawlers/. The minimum viable checks for this audit:

1. Fetch [domain]/robots.txt and check for blocks on: OAI-SearchBot, GPTBot, ChatGPT-User, PerplexityBot, ClaudeBot -- plus wildcard (User-agent: *) disallow rules that catch them.
2. Check the CDN/WAF layer (Cloudflare, Akamai, etc.) -- robots.txt can be clean while the CDN blocks AI agents at the edge. ~27% of B2B sites have this problem accidentally (⚠️ industry estimate). Look for: managed bot-fight rules, AI-bot blocking toggles, WAF rules matching AI user-agents.
3. For each blocked Tier-1 crawler, record the exact rule and location (robots.txt line vs CDN config).

Gate 3: Preview Control (nosnippet / max-snippet)

1. Fetch 5-10 key pages and check <meta name="robots"> tags and X-Robots-Tag HTTP headers for:
   • nosnippet -- suppresses the text preview AI engines quote from. Remove unless there is a specific legal reason.
   • max-snippet: [low number] or max-snippet: 0 -- a restrictive cap truncates what AI can extract. Remove or raise (e.g., max-snippet: -1 for unlimited).
   • noindex on pages that should be cited -- sometimes inherited from staging or legacy SEO configs.
2. Also check for noai/noimageai tags (non-standard but some AI systems honor them).
3. Template-level check: grep the site's templates/theme for these directives -- one template rule can suppress the whole site. Factor weight: 9.2/10 (Zyppy via DigitalApplied, Jun 2026).

Gate 4: Server-Rendered HTML

1. Fetch a key page with a plain HTTP client (curl/Bash) -- no JavaScript execution.
2. Check whether the key citable content (headings, answer paragraphs, data tables, prices) exists in the raw HTML response.
3. If the raw HTML is an empty shell (<div id="root"> + script tags), flag it: ChatGPT-User reportedly does no JS rendering (⚠️ single source), and other AI crawlers have limited rendering (see skills/geo-crawlers/ Step 5).
4. Recommend SSR/SSG or pre-rendering for content pages. App-like interactive pages matter less; content pages must render server-side.

Gate 5: Google Side (AIO / AI Mode / Gemini)

1. Confirm the site is indexed on Google (site: query, Search Console coverage) -- Gemini grounding and AIO retrieval use Google's index.
2. Confirm no Google-Extended or Googlebot blocks that would limit AI-surface eligibility (see skills/geo-crawlers/ for the nuance: Google-Extended controls training/AIO improvement, Googlebot controls indexing).
3. Note: llms.txt is NOT a substitute for any of this -- Google officially confirmed no machine-readable files are needed for generative AI search (Search Central, May 2026), and Zyppy scores llms.txt 2.0/10, lowest of 23 factors. Do not report llms.txt as an access fix.

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Scoring

Gate	Weight	Pass Criteria
Bing indexation + IndexNow	35%	Verified in Bing WMT, money pages indexed, IndexNow live
AI crawler access	30%	All five Tier-1 AI crawlers allowed at robots.txt AND CDN level
Preview control	20%	No nosnippet / restrictive max-snippet / stray noindex on citable pages
Server-rendered HTML	15%	Key content present in raw HTML of all sampled pages

Index + Access Score = weighted sum, 0-100. Any Gate 1 or Gate 2 failure caps the score at 40 -- a site that is not indexed or not crawlable cannot be cited regardless of everything else.

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Output Format

Generate a file called GEO-INDEX-ACCESS-AUDIT.md:

# AI Index + Access Audit: [Domain]

**Analysis Date:** [Date]
**Index + Access Score:** [X]/100
**Verdict:** [Ready / Blocked at Gate N]

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## Gate Results

| Gate | Status | Findings |
|---|---|---|
| 1. Bing indexation + IndexNow | [Pass/Fail] | [WMT verified? indexed pages vs sitemap, IndexNow present?] |
| 2. AI crawler access | [Pass/Fail] | [Blocked crawlers + exact rule location: robots.txt line or CDN rule] |
| 3. Preview control | [Pass/Fail] | [nosnippet / max-snippet / noindex findings + template locations] |
| 4. Server-rendered HTML | [Pass/Fail] | [Sampled pages; which key content is missing from raw HTML] |
| 5. Google side | [Pass/Fail] | [Index coverage, Google-Extended status] |

## Fixes in Priority Order

1. [e.g., "Verify in Bing Webmaster Tools + submit sitemap + deploy IndexNow key" -- ChatGPT entry ticket]
2. [e.g., "Remove `User-agent: GPTBot / Disallow: /` at robots.txt line 12"]
3. [e.g., "Remove `nosnippet` from the base template -- suppresses AI citation previews sitewide"]
4. [e.g., "Move article body from client-rendered React into SSR output"]

## Unlocked Data Sources

- [ ] Bing WMT AI Performance (Copilot) report -- feeds geo-measurement panels
- [ ] Bing WMT keyword data -- feeds geo-fanout sub-query mapping

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Related Skills

• skills/geo-crawlers/ -- the full 14-crawler reference, tiering, and robots.txt recommendation matrix. This skill runs the minimum viable subset; run geo-crawlers for the complete access map.
• skills/geo-fanout/ -- once indexed, sub-query coverage determines what the engines retrieve.
• skills/geo-citability/ -- content-level optimization; only worth doing after all five gates pass.
• skills/geo-measurement/ -- Bing WMT's AI Performance data unlocked here feeds the measurement panels.