Query Fan-Out / Topic-Cluster Optimization Skill

Purpose

This skill optimizes a site for query fan-out -- the mechanism by which AI search engines rewrite a single user prompt into a cluster of sub-queries and retrieve sources per sub-query. Fan-out coverage is the 2026 meta-factor for AI citation: pages win citations by matching the sub-queries engines generate, not by ranking #1 for the head term. This skill maps a topic's sub-query space, audits how much of it the site covers, and engineers titles and URL slugs so pages survive the pre-read gatekeeping step.

Core Insight

Fan-out is the top-scoring citation factor in Zyppy's 23-factor meta-analysis: 9.3/10 (DigitalApplied synthesis of 54 studies, Jun 2026). Engines like Gemini 3 (Jan 2026) and ChatGPT decompose one prompt into multiple sub-queries, run each against their index, and cite the pages that best match each sub-query. The consequence is a collapsed dependence on organic rank:

• Only 38% of AIO-cited URLs rank in the organic top 10 -- down from 76% (Ahrefs, 863K SERPs / 4M URLs, Mar 2026).
• 31% of AIO citations come from positions 11-100, and 31% from beyond position 100 (same study).

Page-3 organic is NOT disqualifying. The fan-out is the small-site opening: a low-authority page that precisely answers one sub-query can be cited over a high-authority page that only covers the head term.

Win the cluster, not the head term.

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How Fan-Out Works (Mechanism)

1. User submits one prompt (e.g., "how much does SR-22 insurance cost in California?").
2. The engine classifies whether to search at all (ChatGPT: only ~18-24% of prompts trigger search).
3. The prompt is rewritten into a cluster of sub-queries -- eligibility, cost, process, location, and language variants of the underlying intent.
4. Each sub-query is run against the engine's retrieval index (ChatGPT: Bing; Gemini/AIO: Google).
5. Retrieved pages pass a pre-read gate on title, snippet, and URL before content is ever opened.
6. The engine cites the best-matching pages across the cluster (~15-50% of retrieved URLs get cited; ⚠️ single source, SubscribePR Jul 2026).

Steps 3-5 are what this skill optimizes. Steps 1-2 and 6 are covered by skills/geo-citability/ and skills/geo-ai-index-access/.

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Step 1: Map the Sub-Query Space

For each target topic, enumerate the sub-query space an engine would fan out into. Generate candidate sub-queries across these five variant axes:

Axis	What to Generate	Example (topic: SR-22 insurance in California)
Eligibility	who qualifies, requirements, edge cases, disqualifiers	"who needs SR-22 in California", "SR-22 after DUI requirements"
Cost	price, average cost, cheapest, cost by segment	"average SR-22 cost California 2026", "cheapest SR-22 insurance Los Angeles"
Process	how to get, how long, steps, filing, renewal	"how to file SR-22 in California", "how long does SR-22 last"
Location	state, county, city, metro variants	"SR-22 insurance San Diego", "SR-22 cost by California county"
Language	non-English variants of every axis above	"seguro SR-22 California precio", "quien necesita SR-22"

Procedure:

1. State the head term / target prompt.
2. Generate 5-15 sub-queries per axis (25-75 total per topic). Use real query sources where available: Google Search Console queries, Bing Webmaster Tools keyword data, autocomplete, "People Also Ask".
3. Deduplicate and cluster the list into 5-10 sub-topics that each deserve a page (or a clearly differentiated section).
4. For each sub-query, record: which existing URL (if any) covers it, and whether coverage is dedicated (page is about this) or incidental (mentioned in passing).

Compliance line: do NOT spin keyword-variant pages with near-identical content. Google's official 2026 guidance classifies keyword-variant page farming as scaled-content abuse (Google Search Central, May 2026). Every cluster page must carry per-page unique data (per-city rates, per-county figures, original numbers) -- the same differentiation bar AI Mode applies when rewarding 15-20-page topic clusters over single pages.

Step 2: Cluster-Coverage Audit

1. Build the coverage matrix: rows = sub-queries from Step 1, columns = candidate URLs on the site.
2. For each sub-query, WebFetch the mapped page and check:
   • Does the page's H1/title directly answer this sub-query?
   • Does a self-contained passage answer it in the first 40-60 words of a section? (See skills/geo-citability/ for passage scoring.)
   • Is the answer data-dense (specific numbers, dates, named entities)?
3. Score each sub-query: Covered (dedicated page, direct answer), Weak (incidental mention or buried answer), Missing (no page).
4. Compute cluster coverage = Covered / total sub-queries.
5. Prioritize gaps by expected retrieval volume: cost and location variants typically carry the most fan-out traffic; language variants are often the thinnest competition.

Deliverable from the audit: a build list of missing pages (each with its target sub-query, required unique data, and engineered title/slug per Step 3) plus a rewrite list of weak pages.

Step 3: Title + Slug Semantic-Match Engineering

Titles and slugs are citation factors before content is read -- they gate whether the engine even opens the page (Ahrefs, 1.4M prompts, Apr 2026):

• Cited-URL titles score 0.656 cosine similarity to the fan-out queries vs 0.484 for non-cited URLs (same study).
• Natural-language slugs cite at 89.78% vs 81.11% for non-natural slugs (same study).

Procedure for each page in the build/rewrite list:

1. Take the primary sub-query the page targets.
2. Write the title to mirror that sub-query in natural language -- include the entity, the variant axis (cost/location/etc.), and the year where freshness matters. Example: SR-22 Insurance Cost in California (2026 Rates by County).
3. Write the slug as a natural-language phrase, not a keyword string or ID:
   • Good: /sr-22-insurance-cost-california/
   • Bad: /sr22-ca-cost-v2/, /page?id=4471, /blog/post-8823/
4. Keep title and H1 aligned with the slug -- all three are read at the gatekeeping step.
5. Sanity-check similarity: the title should read as a direct answer to the sub-query, not a clever headline.

This is the highest-leverage-per-minute intervention in the pack: no new content, no links, just matching the strings engines fan out into.

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Vertical Caveat: High-Overlap Verticals Still Reward Classic SEO

The 38% overlap figure is an average. Insurance, healthcare, and education retain 68-75% overlap between organic top-10 rankings and AI citations (BrightEdge via Shadow, Jul 2026 -- ⚠️ secondary source only, verify before quoting publicly). In these YMYL verticals:

• Classic ranking work still feeds AI citations directly. Do NOT deprioritize traditional SEO.
• Fan-out coverage is additive, not a replacement: build the cluster AND keep ranking the head terms.
• If the site being audited is in one of these verticals, say so explicitly in the report and weight classic-SEO fixes accordingly.

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Output Format

Generate a file called GEO-FANOUT-COVERAGE.md:

# Fan-Out Cluster Coverage: [Domain] -- [Topic]

**Analysis Date:** [Date]
**Head Term / Target Prompt:** [Prompt]
**Sub-Queries Mapped:** [N]
**Cluster Coverage:** [X]% ([Covered]/[Total] sub-queries with dedicated pages)

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## Coverage Matrix

| Sub-Query | Axis | Mapped URL | Status | Action |
|---|---|---|---|---|
| [sub-query] | Cost | [URL or --] | Covered/Weak/Missing | [Build/Rewrite/None] |

## Title + Slug Engineering Queue

| Page | Target Sub-Query | Current Title | Proposed Title | Proposed Slug |
|---|---|---|---|---|
| [URL/new] | [sub-query] | [title] | [natural-language title] | [/natural-language-slug/] |

## Vertical Overlap Assessment

[Is this a 68-75% high-overlap vertical (insurance/healthcare/education)?
 If yes: classic SEO remains a primary lever -- note the ⚠️ secondary-source flag.]

## Recommended Build Order

1. [Highest-volume missing sub-query page -- required unique data noted]
2. [Next]

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Related Skills

• skills/geo-citability/ -- once a page passes the title/slug gate, passage-level citability determines whether it gets quoted.
• skills/geo-ai-index-access/ -- fan-out coverage is worthless if the pages are not in the retrieval index (Bing for ChatGPT, Google for AIO/Gemini).
• skills/geo-youtube/ -- YouTube is the rank-free bypass for sub-queries the site cannot win with text pages.
• skills/geo-measurement/ -- measure cluster-coverage gains as share-of-citation over a prompt panel, not rank.