The Technical SEO Checklist: How to Brief an Agency and What to Expect

You’ve decided to hire an SEO agency. Good call—technical SEO is one of those areas where a specialist’s eye can save you months of trial and error. But here’s the thing: a bad brief will get you a generic audit, a generic audit will get you generic recommendations, and generic recommendations won’t move the needle. If you want your money to work, you need to know what to ask for, what to watch out for, and how to spot the difference between a genuine expert and someone who just runs a tool and calls it a day.

Let’s walk through what a proper technical SEO engagement looks like—from the initial audit to ongoing site health monitoring—and how you can brief an agency so you get the results you’re paying for.

What Is Technical SEO, Really?

Technical SEO is the foundation layer of search optimization. It’s not about keywords, content, or backlinks—those come later. Technical SEO ensures that search engines can find, crawl, interpret, and index your pages correctly. If any part of that chain breaks, your content might as well not exist.

Think of it this way: you can have the best article on the web, but if Googlebot hits a 404 on your sitemap or your robots.txt blocks the page, nobody will ever see it. Technical SEO is the plumbing—unglamorous, but absolutely essential.

A proper technical audit covers:

• Crawlability and indexation – Can search engines find your pages? Are there unnecessary blocks? Is your crawl budget being wasted?
• Site architecture and URL structure – Is your site logically organized? Are you creating orphan pages?
• Core Web Vitals and performance – How fast does your site load? Is it stable? Does it respond quickly to user input?
• Duplicate content and canonicalization – Are you confusing search engines with multiple versions of the same page?
• Structured data – Are you helping search engines understand your content with schema markup?
• Security and HTTPS – Is your connection secure? Are mixed content warnings hurting your trust signals?

Agencies that skip these basics and jump straight to “we need more content” or “let’s build links” are skipping the foundation. That’s a red flag.

How to Brief a Technical SEO Audit

A good brief is specific. Don’t just say “I need a technical SEO audit.” That’s like walking into a mechanic’s shop and saying “fix my car.” Instead, give the agency context about your site, your goals, and your pain points.

Here’s what a strong brief includes:

1. Your current situation – What platform are you on (WordPress, Shopify, custom CMS)? How many pages? Any recent migrations or redesigns? Any known issues like traffic drops or indexation problems?
2. Your goals – Are you trying to improve rankings for specific terms? Increase organic traffic? Fix a recent penalty or manual action? Reduce bounce rate from slow pages?
3. Your constraints – Do you have limited dev resources? A strict deployment schedule? Any compliance or legal requirements (e.g., GDPR, accessibility standards)?
4. Your previous work – Have you done any SEO before? What tools do you use (Screaming Frog, Ahrefs, Semrush, Google Search Console)? What have you tried that didn’t work?

The more context you give, the less time the agency spends guessing—and the more time they spend solving real problems.

The Audit Process: What an Agency Should Deliver

A proper technical audit isn’t a one-page PDF with a few bullet points. It’s a detailed, prioritized list of issues with clear instructions on how to fix them. Here’s what you should expect:

A good agency doesn’t just tell you what’s broken. They tell you what to fix first, what to fix later, and what to ignore entirely.

Crawl Budget and Site Architecture: The Hidden Lever

Most site owners don’t think about crawl budget until something goes wrong. But if you have a large site—thousands of pages or more—how Google allocates its crawl resources matters. If your crawl budget is being wasted on thin pages, duplicate content, or infinite parameter URLs, your important pages might not get crawled as often as they should.

An agency should:

• Analyze your log files (if available) to see how Googlebot actually crawls your site
• Identify crawl waste – pages that shouldn’t be crawled (e.g., filter URLs, pagination parameters, session IDs)
• Optimize your XML sitemap – only include canonical, indexable pages; no redirects, no 404s, no noindex pages
• Review robots.txt – make sure you’re not accidentally blocking important resources (CSS, JS, images) or important pages

One common mistake: agencies block too much in robots.txt, thinking they’re helping. In reality, they’re often blocking resources that Google needs to render pages. A well-configured robots.txt is surgical—it blocks only what’s truly unnecessary.

Core Web Vitals: The Performance Trap

Core Web Vitals (LCP, CLS, FID/INP) are real ranking signals. But here’s the reality: some agencies may treat them as a checkbox exercise, running a Lighthouse report and giving a generic recommendation without digging deeper.

A thorough approach involves:

• Diagnosing the actual cause – Is LCP slow because of server response time, render-blocking resources, or large images? Each cause has a different fix.
• Measuring real user data – Lighthouse lab data is useful, but field data from Chrome User Experience Report (CrUX) tells you what real users experience.
• Prioritizing fixes by impact – Focus on changes that benefit the most important pages first.

What can go wrong? Over-optimization. For example, lazy-loading above-the-fold images can hurt LCP. Or aggressively deferring JavaScript can break critical functionality. Performance optimization is a balancing act—don’t let anyone tell you it’s simple.

Duplicate Content and Canonicalization: The Silent Killer

Duplicate content doesn’t typically get you penalized with a manual action for having similar product descriptions. What happens instead is that your crawl budget gets diluted, your link equity gets split, and your pages compete against each other in search results.

A technical SEO audit should:

• Identify all versions of a page – HTTP vs. HTTPS, www vs. non-www, trailing slash vs. no trailing slash, parameter variations
• Check canonical tags – Are they pointing to the right URL? Are there conflicting signals (e.g., canonical pointing to a 404)?
• Review pagination – Are you using rel=next/prev correctly? Are you leaking link equity through paginated archives?
• Assess content similarity – Tools can flag pages with high content overlap, but a human judgment is needed to decide if they should be merged or differentiated

The risk: wrong redirects. If you migrate a site and use 302 redirects instead of 301, or if you redirect an old page to an irrelevant new page, you lose link equity and confuse search engines. An agency should map every redirect carefully and test the chain before going live.

Link Building: The Risky Part

Link building is where most SEO horror stories live. Black-hat tactics—paid links, private blog networks (PBNs), link farms—can carry significant risk. Google’s algorithms aim to detect unnatural link patterns, and a manual penalty can set you back months.

Here’s how to brief a link building campaign safely:

1. Set clear quality standards – Only pursue links from relevant, authoritative sites with real traffic. Avoid directories, spammy guest posts, and any site that sells links.
2. Require transparency – The agency should provide a list of target sites for your approval before outreach begins.
3. Monitor the backlink profile – Use tools like Ahrefs or Majestic to track new links and flag any suspicious patterns.
4. Disavow as a last resort – If you inherit a bad backlink profile, the disavow tool exists, but it’s not a magic wand. Use it only when you have clear evidence of toxic links.

A good agency will focus on:

• Digital PR – Earning links through newsworthy content or data
• Resource-based link building – Creating valuable tools, guides, or research that people naturally link to
• Broken link building – Finding broken links on relevant sites and offering your content as a replacement
• Guest posting on high-authority sites – Only if the content is genuinely useful and the site is relevant

The metric to watch isn’t Domain Authority or Trust Flow in isolation. It’s the relevance and authority of the linking domain, the context of the link, and whether it drives referral traffic.

The Checklist: What to Ask an Agency Before You Sign

Before you commit to a technical SEO engagement, run through this quick checklist:

• Do they understand your platform and its limitations?
• Can they provide a sample audit report from a past client (anonymized)?
• Do they explain technical concepts in plain language, or do they hide behind jargon?
• Do they promise specific ranking improvements or traffic numbers? (They shouldn’t.)
• Do they have a clear process for prioritizing fixes by impact and effort?
• Do they use real user data (CrUX, Search Console) or just lab tools?
• Do they have a plan for monitoring site health after the initial audit?
• Are they transparent about risks—especially with link building?
• Do they require access to your Google Search Console, Analytics, and server logs?
• Do they provide clear instructions for your dev team, not just vague recommendations?

If an agency can’t answer these questions clearly, walk away. Technical SEO is too important to leave to guesswork.

Conclusion: The Long Game

Technical SEO isn’t a one-time fix. It’s an ongoing process of monitoring, testing, and adjusting. Search engines change their algorithms, your site evolves, and new issues emerge. A good agency treats technical SEO as a partnership, not a project.

The brief you write sets the tone. Be specific, be honest about your constraints, and demand transparency. The agencies that deliver real value will welcome that clarity. The ones that don’t—well, you’ll know soon enough.

If you’re ready to take the next step, consider starting with a technical SEO audit to understand where your site stands today. From there, you can build a strategy that actually moves the needle—without the shortcuts that come back to bite you.