Choose the provider that can explain the business decision
Three SEO proposals can look almost identical. Each promises technical fixes, content, links and reporting. One quotes the largest number of articles. Another shows a traffic graph. A third adds “GEO” and “AI visibility” to the package. None of those details tells an owner whether the work will create suitable discovery, qualified enquiries or an asset the company still controls after the contract ends.
My verdict is: select the diagnosis and operating model before comparing the output volume. A credible provider should identify which customer decision the business needs to win, why the current site is not earning that discovery, what evidence is missing and how progress will be connected to commercial outcomes.
Google describes hiring an SEO as a decision that can improve visibility and save time, but can also damage a site and its reputation when the work is irresponsible. Its current guidance recommends interviewing the provider, checking references, understanding the changes and rejecting guaranteed rankings.
This question is narrower than deciding whether the business is ready for external growth support or choosing among an agency, in-house hire and solo specialist. Here, the decision is how to evaluate the proposed search work itself—including claims about Google and AI discovery.
The Search Partner Evidence Test
I use six gates to compare SEO agencies and consultants. Ask every shortlisted provider to explain each gate using your business, not a generic pitch deck.
Which buyer decision should search influence?
Name the priority customer, problem, market and next action. “More organic traffic” is not a complete business objective.
What is blocking useful discovery now?
Separate crawling and indexing problems, weak commercial pages, unclear positioning, missing proof and low or unsuitable demand.
Can the provider explain every change?
Require the reason, expected mechanism, owner, risk and validation method for technical, content, authority and AI-search recommendations.
What will the website add to the market?
Look for evidence, tools, comparisons and first-hand insight—not a monthly quota of interchangeable articles.
Can discovery reach qualified demand?
Connect Search Console and AI-referral evidence to useful visits, enquiries, opportunities, customers or revenue without claiming false causality.
What remains under company control?
The business should own the domain, CMS, analytics, Search Console, source content, data and a documented change history.
The diagnosis should come before the package. A site blocked from crawling needs access repaired. A technically healthy site with vague service pages needs clearer commercial information and proof. A site attracting irrelevant informational traffic may need consolidation, not another content calendar.
Google's June 2026 third-party guidance says external tool data should not be confused with Google's internal ranking information. It recommends checking advice against official guidance and using Search Console as the first-party source for Google Search performance. A polished audit export is therefore an input, not the strategy.
Do not buy a separate AI-search promise without search foundations
Terms such as generative engine optimisation (GEO) and answer engine optimisation (AEO) describe work intended to improve visibility in AI-generated answers. The commercial question is not whether the provider uses the newest label. It is whether the recommendations help relevant systems access, understand and trust useful business evidence.
Google states that its generative-search features are rooted in core Search ranking and quality systems. Its current guidance prioritises crawlable technical structure and non-commodity, people-first content. It also says special AI files, forced content “chunking”, AI-only rewrites and special generative-search schema are not required for Google.
OpenAI separately states that public sites can appear in ChatGPT search and that publishers should allow OAI-SearchBot when they want content discovered and cited. ChatGPT referral links include a source parameter that can be measured in analytics. That makes crawler access and referral evidence useful checks; it still does not create a guaranteed mention or ranking.
Check robots rules, indexability, canonical signals, rendering and internal discovery before discussing visibility.
Publish clear answers, identifiable authorship, original value, current facts and proof with visible limitations.
Measure qualified landing behaviour, enquiries and sales progression alongside mentions, citations and traffic.
Ask an AI-search provider to distinguish what it directly observes, what it infers and what no external tool can know. Use the AI Visibility Evidence Ladder to review measurement and the AI Citation Readiness System for the underlying evidence work.
Choose, narrow, diagnose or reject
| Proposal pattern | Decision | Owner action |
|---|---|---|
| Clear customer and commercial job; diagnosis is specific; methods, ownership and measurement are transparent | Shortlist | Compare the first decision cycle, relevant proof, team and complete operating cost |
| Provider appears capable, but the site, demand and measurement baseline are still uncertain | Start with a diagnostic | Use read-only access first and require prioritised findings, risks, effort and decision options |
| One constraint is clear—such as migration, technical access, local discovery or content strategy | Use a focused specialist | Scope the defined problem instead of buying an oversized recurring package |
| Customer, offer or conversion path is unclear; search cannot yet be tied to a useful action | Repair the foundation | Clarify the segment, offer, proof and conversion route before scaling content |
| Guaranteed rankings, secret methods, bulk links, “Google-approved” tools, locked accounts or unqualified AI-visibility promises | Reject | Do not give write access or let the proposal create long-term site and reputation risk |
Relevant case evidence should show the starting condition, work, timeframe, measurement limits and business context. A traffic increase without the original base, query relevance or conversion outcome is not enough. Use the Case Study Credibility Chain and review the provider's client references where possible.
Ask who will actually work on the account, which work is outsourced, what the business must supply and what happens when a recommendation touches engineering, legal, product or sales. Search performance often depends on cross-functional decisions that the agency cannot make alone.
Define the first 90 days before signing
Ninety days is a governance window, not a ranking promise. The purpose is to make the engagement inspectable and reversible while early evidence develops.
Baseline
Confirm the priority customer and commercial page, Search Console and analytics access, indexability, current discovery, conversions and known site risks.
Prioritise
Rank issues by likely business effect, confidence, dependency and effort. Agree what will not be done and why.
Ship
Repair critical access, improve one high-value decision path and create one original evidence asset. Record every material change.
Decide
Review access, relevant discovery, buyer behaviour, qualified demand and learning. Continue, narrow, repair or exit with a documented handover.
Set separate leading and commercial indicators. Early evidence may include valid indexing, improved query relevance, coverage of priority buyer questions and engagement with a decision page. Later evidence may include qualified enquiries, opportunities or revenue. Do not force a long sales cycle into a weekly revenue promise.
Define access and change control in writing. Google recommends granting read-only Search Console access for an initial audit and requiring realistic estimates of improvement and work. The business should approve high-risk changes, retain administrator access and receive a clear record of what changed and why.
If you first need to decide whether search deserves more time, use the Search Investment Proof Chain. If the decision is search versus immediate demand capture, use the Paid Ads vs SEO framework. Review growth services, case evidence, Thomas's operator model and the diagnostic route before choosing the next step.
Sources and evidence notes
Sources and current search results were checked on 27 August 2026. Search priority is qualitative; no search volume, ranking guarantee, universal contract length or provider-performance claim is presented. The Search Partner Evidence Test, three-layer evidence model, decision matrix and 90-day scorecard are original ThomPerformance practitioner analysis. No synthetic performance data or invented client result is used.
Frequently asked questions
What should I look for when choosing an SEO agency?
Look for a provider that understands the business model and priority customer, diagnoses the current discovery constraint before prescribing work, explains its methods, connects search evidence to qualified demand, and leaves the company in control of its website, accounts, content and data. Relevant proof and a clear first-90-day plan matter more than a long service list.
Is a guaranteed first-page ranking a red flag?
Yes. Google states that no one can guarantee a number-one ranking. A credible provider can explain the opportunity, assumptions, work, milestones and risks, but it cannot control whether Google crawls, indexes or serves a page for a particular query.
Should an SEO agency also offer GEO or AI-search optimisation?
It should understand how the business is discovered across Google and relevant AI-search experiences, but treat GEO or AEO as part of a wider search and evidence system rather than a collection of hacks. Google says its generative-search features rely on core search systems and do not require special AI files or schema.
What should an SEO agency report each month?
The report should connect work shipped to technical access, relevant discovery, buyer actions and commercial progression. Include Search Console evidence, landing-page behaviour and qualified enquiries or revenue where the sales cycle allows. Rankings and traffic can diagnose movement, but they should not be presented as the final business outcome.
How long should an initial SEO agency engagement be?
Use a term long enough to diagnose, implement and observe the first credible evidence cycle, with defined review points and a clear exit. Ninety days is useful for governance, not a universal results deadline. New sites, long sales cycles, engineering dependencies and low search demand may require a different window.
Buy an inspectable search system, not a visibility promise
The right SEO agency should make the business easier to discover and the investment easier to govern. Require a commercial diagnosis, explainable methods, original value, connected measurement and company-owned assets. Reject any proposal that needs secrecy, guarantees or content volume to replace evidence.
Which provider claim would you currently be unable to verify from your own accounts and customer data?