Agency Field Guide
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The buyer's field guide

What services should a digital marketing agency provide?

A digital marketing agency should provide the services needed to address your agreed business problem, supported by a plan, a delivery team and useful measurement. Common services include strategy, paid media, SEO, content, social, email, design, conversion optimization and analytics. You do not need all of them merely because an agency sells them.

Start with what has to change in the business. Then decide which capabilities you should buy and which your team can provide.

Use the problem to choose the service

Business conditionPossible serviceEvidence that it belongs in the plan
The right buyers do not understand the offerResearch, positioning and messagingBuyer evidence showing a comprehension or relevance problem
Relevant demand exists but you rarely capture itSearch strategy, paid search or distributionDemand evidence and economics for reaching it
Traffic arrives but important actions failUX, conversion research or developmentJourney data, usability findings and technical evidence
Leads arrive but sales rejects themTargeting, qualification or CRM workLead-quality definitions and sales feedback
Customers buy once and rarely returnLifecycle and retention workCohort data and a plausible reason to purchase again
Teams cannot agree on performanceAnalytics and measurement designA documented discrepancy or decision the current setup cannot support
Execution is inconsistentProduction and operational supportA defined workflow with a measurable capacity shortfall

The table offers starting hypotheses. Low conversion can come from the wrong audience, a weak offer, a broken checkout or unavailable inventory. Each calls for a different response. An agency should investigate enough to justify its prescription.

Strategy should produce decisions

Ask what the strategy engagement leaves you able to do. Useful outputs include a prioritized problem definition, audience evidence, positioning choices, an investment plan and explicit exclusions. Someone should be able to use the work to approve or reject a proposed activity.

A channel list with quarterly targets is incomplete if it never explains the assumptions connecting the activities to business performance. Ask why the plan prioritizes those channels, what would invalidate it and which dependencies your team must address.

Tim's discussion of analytics and agency value argues for understanding how marketing interacts with the rest of the business. Applied to buying services, that means expecting a provider to consider the commercial consequences of its recommendations while clearly defining its actual responsibility.

Delivery needs units you can understand

Specify what each service includes. “Content marketing” could mean research and editorial planning, articles, graphics, distribution, revisions and performance analysis. It could also mean four lightly edited drafts arriving in a folder.

For paid media, define platforms, markets, creative responsibilities and landing-page work. For email, distinguish flows from campaigns and new builds from maintenance. For web work, distinguish discovery, design, development, content migration and support.

The units should help both sides plan capacity. Avoid rewarding pointless volume. Ten articles with no credible information or distribution plan are ten more things to maintain.

Every dependency needs an owner

Create a simple responsibility map with four fields: required task, agency owner, client owner and deadline or response standard. Include legal approval, product information, access, implementation and sales feedback where relevant.

For example, the agency may write and test a landing page, but your development team must deploy it. If deployment takes six weeks, the media plan needs to reflect that. The client cannot promise urgent implementation and then judge the agency as if the promise were fulfilled when it was not.

Conversely, the agency should flag a blocked dependency promptly and recommend a useful alternative. Continuing to invoice against an unchanged plan while a prerequisite remains unavailable is poor management.

Analytics must support an actual decision

Require a documented metric definition, data source and action for every headline measure. Track business outcomes alongside diagnostic measures and delivery progress.

Avoid adding attributed revenue from different advertising and messaging platforms as though each records a separate sale. Attribution depends on platform rules and windows. Reconcile reporting to the underlying business records and disclose what remains uncertain.

Ask to see a sample report that includes the agency's interpretation, proposed action and the approval it needs from you. The reporting guide provides a model.

Treat SEO and AEO claims with the same evidence standard

An agency may recommend improving content, technical accessibility and the clarity of your business information to help search systems understand the site. Ask which specific problems it has identified and how it will measure progress.

Google says no special schema is required for its generative AI search features and that eligibility does not guarantee inclusion. Be wary of a provider selling guaranteed AI citations or presenting a markup package as a dependable visibility switch. Google's generative AI search guidance.

If the agency tracks AI visibility, ask which prompts, systems, dates and repetitions it uses. Treat those observations as a defined sample. A handful of answers cannot establish the share of all relevant searches.

Agree on exclusions before they become disputes

An explicit exclusion can improve a proposal. It tells you where another capability or internal contribution is needed. Ask about media spend, software, photography, translations, specialist compliance review, development and work outside normal support hours.

Also distinguish things the agency controls from outcomes it influences. It can commit to a sound process, qualified people, timely delivery and competent advice. Sales results can depend on pricing, product quality, availability, sales execution and market conditions outside its authority.

That distinction should improve cooperation, not excuse weak work. Agree on how both parties will detect problems and revise the plan.

Buy the smallest coherent scope

Choose enough work to address a meaningful problem, including its essential dependencies. Stage additional services behind evidence and review points. A smaller coherent engagement is easier to evaluate than a sprawling package with no clear primary objective.

Before signing, ask the agency to finish this sentence in ordinary language: “This work should improve this business condition because…” Then ask for the assumptions and proof behind the answer. Use Agency Field Guide to find candidates with the needed capabilities, rather than collecting services until the proposal feels substantial.