Working With Marketing Agencies: A Client's Playbook
Most resources about agencies focus on selection — how to choose the right one. Far less attention goes to the client-side behaviors that determine whether a hired agency does great work or mediocre work. The same agency, working with two different clients, can produce wildly different results based on how the client engages.
This guide flips the perspective: it’s about what makes you a great client. The kickoff structure, communication rhythms, feedback patterns, and habits that consistently produce better agency outputs.
Why client behavior matters
A common misconception: “We pay the agency, so getting great work is their problem.”
Reality: agencies are constrained by the inputs you give them. The clearest brief, fastest decisions, sharpest feedback, and most strategic context produce the best work. The opposite — vague briefs, slow decisions, vague feedback, low context — produces mediocre work even from great agencies.
Companies that consistently get great agency work tend to:
- Give specific, written briefs
- Make decisions fast (or empower their PM to make them)
- Provide sharp, specific feedback
- Share strategic context generously
- Maintain professional respect even in disagreement
These are behaviors. Anyone can adopt them.
The kickoff: setting up for success
The first 30 days establish the working relationship. Critical investments:
1. Comprehensive onboarding document
Provide written context the agency wouldn’t otherwise have:
- Business goals for the year
- Ideal customer profile in detail
- Current funnel metrics (CAC, LTV, conversion rates by stage)
- Competitive landscape from your perspective
- Brand voice / style guide
- Past campaigns and what worked/didn’t
- Stakeholders and their decision rights
- Reporting expectations and cadence
An onboarding document is 5-10 hours of your time. Saves the agency 20-40 hours of figuring it out. Net positive for everyone.
2. Joint goal-setting
What does success look like in 90 days, 6 months, 12 months? Specific metrics with numbers.
Example: “Generate $400K in marketing-attributed pipeline by Q4. Specifically, 50 SQLs/month at $250 CPL by month 6.”
Vague goals (“grow leads”) produce vague work. Specific goals enable focused execution.
3. Access setup
Day-one of engagement: ensure agency has access to:
- Google Ads, Meta Ads Manager, LinkedIn Campaign Manager (admin or marketing manager level)
- GA4, Search Console
- CRM (read access at minimum)
- Marketing tools (CMS, email platform, etc.)
- Brand asset library
Delays here delay everything else. Get it done in week 1.
4. Communication cadence
Weekly 30-minute call with the strategist. Bi-weekly tactical syncs. Monthly executive review.
Establish recurring meetings on calendars before the engagement starts.
5. Slack or Asana / shared workspace
Real-time async communication beats email for most agency interactions. Set up a shared Slack channel or project workspace from day one.
Communication rhythms that work
Weekly cadence
Monday: agency sends weekly priority list. What they’re working on this week, what’s complete, what’s blocked.
Wednesday: tactical sync (15-30 minutes). Address blockers, review in-progress work, align on this week’s outputs.
Friday: agency sends end-of-week summary. What shipped, what’s deferred, what’s coming next week.
Monthly cadence
First Monday of month: 60-minute strategic review. Performance vs. goals, what’s working, what’s not, next month’s plan.
Quarterly cadence
90-minute business review. Bigger-picture: are we on track to annual goals? What strategic adjustments needed?
Ad hoc
Slack/email response within 24 hours for non-urgent. Within 4 hours for urgent (with appropriate escalation channels for true emergencies).
Writing briefs that produce great work
A well-written brief is the difference between average work and great work.
Bad brief
“We need landing pages for our new campaign.”
Good brief
Goal: launch landing pages for "Performance Max for Ecom" service offering.
Audience: ecommerce founders, $1M-$20M revenue, currently running Google Shopping but underwhelmed by results.
Pain point we're addressing: most agencies don't actually know Performance Max — they migrate Shopping ads and call it done.
What our offer is: comprehensive PMax audit + restructure + ongoing management. $5K-$15K/month range.
What we want from this page: book a 20-minute discovery call.
Key proof points to include:
- 47% average ROAS lift on accounts we've migrated
- 3 client examples (use [Brand X], [Brand Y], [Brand Z] — they've approved use)
- Founder quote about service quality
Tone: confident but specific. Avoid generic agency-speak.
Deadlines:
- Draft: October 15
- Revisions: October 22
- Final: October 30
Stakeholders for approval:
- Marketing director (primary)
- Founder (final sign-off)
Specific brief = specific deliverable. Vague brief = vague deliverable. The difference compounds across campaigns.
Giving feedback that improves work
Most clients give bad feedback. Patterns:
Bad feedback
- “I don’t love it.”
- “Can you make it pop more?”
- “It needs to be more on-brand.”
- “Let’s try something different.”
Good feedback
- “The headline doesn’t address our specific pain point — try variants that explicitly mention ‘underwhelming Shopping results’.”
- “The CTA color blends in too much; test a brighter contrast against the section background.”
- “We use ‘partner’ more often than ‘agency’ in our messaging — please update.”
- “The first variant is closer to right. Can we get 2 more in that direction, varying the social proof placement?”
The pattern: specific, actionable, references the brief.
When giving feedback:
- State what’s working (not just what isn’t)
- Be specific about what isn’t working AND why
- Suggest direction (don’t just say “make it better”)
- Reference back to the original brief and goals
This is how brand new in-house marketers get trained over years. Apply the same discipline with agencies.
What to share generously
Agencies do better work with more context. Share:
Strategic context:
- Internal product roadmap (under NDA)
- Sales call recordings (the unfiltered customer voice)
- Customer success conversations
- Board updates and investor positioning
- Competitive intelligence
Tactical context:
- Past campaign data (what worked, what didn’t)
- A/B test results
- Customer feedback themes
- Sales objections and how reps handle them
Performance data:
- Real-time CRM data, not just monthly reports
- Closed-won analysis
- Win/loss reasons
The agency you keep at arm’s length produces arm’s-length work. The agency you treat as a strategic partner produces partner-quality work.
Decision-making structure
A frequent failure mode: agency waits 2 weeks for a decision the client should have made in 2 hours.
Define decision rights upfront:
Agency decides without approval:
- Ad copy tactical variations
- Bid adjustments within agreed targets
- Negative keyword additions
- Within-budget spend reallocation
Agency proposes, client approves quickly (24-48 hours):
- New ad creative concepts
- Campaign structure changes
- Landing page revisions
Joint strategic decisions:
- Quarterly budget allocation
- New channel testing
- Major creative direction changes
Client decides alone:
- Annual budget envelope
- Brand voice and positioning
- Product/service positioning
Document this. Stuck decisions are usually a decision-rights ambiguity issue.
What kills the relationship
Patterns to avoid:
1. Constant scope changes without acknowledgment. Adding work that wasn’t in the agreement is normal sometimes — but acknowledge it changes deliverables.
2. Long approval cycles. Two-week-plus delays on simple approvals signal disinterest and degrade momentum.
3. Public criticism. Negative comments to the agency in front of their junior staff or in shared channels damages relationships. Address one-on-one with the lead.
4. Vague satisfaction signals. “It’s fine” without specifics leaves the agency guessing. Better to say “I’d improve X and Y” than ambiguously “approve.”
5. Lack of clarity on what success looks like. If you can’t articulate it, the agency can’t deliver it.
6. Mid-engagement scope reversal. “Actually, let’s not pursue that strategy after all” three months in. Costs the agency real time and erodes trust.
7. Slow paying. Treat the agency like a vendor whose financial health matters. Don’t drag invoices.
What signals you’re being a good client
The flip side. Good clients:
- Send written briefs before kickoffs
- Make most approvals in <48 hours
- Give specific feedback, not generic
- Share strategic context proactively
- Pay on time
- Treat the agency team with professional respect
- Defend the agency to internal stakeholders when appropriate
- Renew engagements rather than constantly testing new agencies
Agency staff talk to each other. Reputation as a “great client” gets you better account managers, more senior strategist attention, and more flexibility on small asks.
A 90-day post-hire optimization
After the first 90 days of an agency engagement:
Day 90 review: are the foundational behaviors in place? Communication rhythms working? Decision speed acceptable? Feedback specific?
Day 90 retrospective: what’s working in our process? What’s not? Adjust both sides.
Day 90 plan: clarify the next quarter’s priorities. Refresh goals if needed.
If by day 90 the working relationship is still rocky, address it directly. Don’t let resentment build.
Frequently asked questions
What if I’m too busy to write detailed briefs? Delegate brief-writing to your marketing manager. Or have a 30-minute kickoff call where the agency asks the right questions and writes the brief themselves. Sign off in writing.
What if I disagree with my agency’s recommendation? Discuss reasoning. Sometimes the agency is right and you’ll change your mind; sometimes you’re right and they’ll defer. Make decisions based on substance, not just authority.
Should I be friendly with my agency, or professional-only? Professional and warm is the right zone. Genuine friendship can complicate hard conversations. Pure transactional kills creativity.
How much should I trust my agency’s recommendations? For tactics in their specialty: high trust by default. For strategy that affects your business deeply: scrutinize more carefully. They have less context than you do on internal dynamics.
What if my agency makes a major mistake? Address directly and quickly. Most professional agencies will own it and propose remediation. If they deflect blame, that’s a relationship signal.
Being a great client isn’t about being demanding or generous — it’s about being clear, specific, and decisive. The behaviors above are learned, not innate. Companies that treat their agency relationships as joint ventures with disciplined client-side execution get dramatically better work than companies that hire-and-blame. The best agency relationships are the ones where both sides feel they’re working with their best partners.