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How to Brief an Agency on LinkedIn Ads
How to Brief an Agency on LinkedIn Ads
The quality of what you hand an agency at the start largely determines how fast they perform — a good brief gives them your goals, ICP, offers, brand, data, and access so they can hit the ground running, while a vague one guarantees a slow, expensive ramp. Agencies are often blamed for slow starts that are really the client’s fault: unclear goals, no ICP definition, no access to data, no offers to work with. The agency then spends weeks reconstructing what you could have handed them on day one. This guide covers exactly what to give an agency so they can perform quickly, and why each input matters to the results you’ll get.
Key takeaways
- What you hand an agency at the start largely determines how fast they perform.
- A good brief includes goals, ICP, offers, brand assets, historical data, and access.
- Define success as pipeline and qualified outcomes, not vanity metrics, so the agency optimizes for the right thing.
- Historical data and access let the agency skip weeks of reconstruction and start optimizing.
- A vague brief guarantees a slow, expensive ramp — the agency reconstructs what you could have provided.
Why does the brief determine agency performance?
Because an agency can only work with what you give them, and reconstructing missing inputs is slow. If you hand over clear goals, a defined ICP, working offers, brand assets, historical performance data, and account access, the agency can start optimizing immediately. If you don’t, they spend the first weeks — on your budget — figuring out who you’re targeting, what’s worked before, and how you measure success, before they can do the actual work. Slow agency starts are frequently a briefing failure, not an agency failure.
The brief is also where you align the agency to the right outcome. If you don’t specify that you measure pipeline and SQLs rather than leads and clicks, the agency may optimize for the metrics that look good rather than the ones that matter to your business. A good brief sets both the inputs and the definition of success, so the agency works efficiently toward the right goal from the start.
What goals should you give the agency?
Business outcomes, defined precisely — not vanity metrics. Tell the agency what success actually looks like for your business: pipeline targets, cost per SQL, or revenue goals, along with your sales cycle length and how you attribute results. This matters because the agency will optimize toward whatever you tell them to hit, so if you set a cost-per-lead target, you’ll get cheap leads; if you set a cost-per-SQL target, you’ll get qualified pipeline. Defining success as the qualified outcomes that matter to your business, rather than the clicks and leads that are easy to measure, is what points the agency’s work in the right direction.
What inputs should you hand over?
Everything that lets the agency understand your business and start optimizing. A complete handover includes:
| Input | Why it matters |
|---|---|
| Goals and success metrics | So the agency optimizes for the right outcome |
| ICP and personas | So they target the right people |
| Offers and lead magnets | So they have something to convert with |
| Brand assets and guidelines | So creative is on-brand from the start |
| Historical performance data | So they build on what’s worked, not from scratch |
| Account and tracking access | So they can run and measure campaigns |
| Sales-cycle and attribution info | So they measure over the right window, correctly |
The theme is that the agency should understand your business and inherit your existing knowledge, rather than rediscovering it. Each input you provide is weeks the agency doesn’t spend reconstructing it.
Why does historical data matter so much?
Because it lets the agency build on what you’ve already learned instead of relearning it on your budget. If you’ve run LinkedIn Ads before, you know things — which audiences performed, which offers converted, what cost per outcome looked like, what didn’t work. Handing that over means the agency starts from your accumulated knowledge and improves on it, rather than repeating experiments you’ve already run. Without it, they begin from zero, spending time and budget rediscovering lessons you could have simply told them. Historical data is one of the highest-value inputs precisely because it compresses the agency’s learning curve — it’s the difference between an agency that’s productive in week one and one that’s still finding its feet in month two.
The agency briefing framework
Set an agency up to perform by handing over:
- Goals and success metrics — pipeline and cost per SQL, not clicks and leads, with your sales cycle and attribution approach.
- ICP and personas — a precise definition of who you’re targeting and what they care about.
- Offers and brand — the offers and lead magnets to convert with, plus brand assets and guidelines.
- Historical data — past performance, what’s worked and what hasn’t, so they build rather than rediscover.
- Access and alignment — account and tracking access, a point of contact, a feedback loop, and sales alignment.
What happens with a vague brief?
The agency ramps slowly and expensively while reconstructing what you should have provided. Without clear goals, they optimize toward the wrong metrics; without your ICP, they guess at targeting; without historical data, they repeat experiments you’ve already run; without access, they can’t even start. Each gap adds weeks to the ramp, all spent on your budget, and often produces early results that look like agency underperformance but are really the consequence of a poor handover. The frustrating dynamic is that the client concludes the agency is slow or ineffective, when the agency was set up to fail by an incomplete brief. Investing time upfront in a thorough handover is the single most effective thing a client can do to get results from an agency quickly — it’s the same principle as a creative brief, applied to the whole engagement: clarity upfront produces performance, and its absence produces an expensive, slow start.
Frequently Asked Questions
Q1. How do you brief an agency on LinkedIn Ads?
Hand over your goals and success metrics (pipeline and cost per SQL, not vanity metrics), your ICP and personas, your offers and lead magnets, brand assets, historical performance data, account and tracking access, and your sales-cycle and attribution details. The more complete the handover, the faster the agency performs, since they build on your knowledge rather than reconstructing it.
Q2. What should you give a LinkedIn Ads agency to start?
Goals, ICP, offers, brand assets, historical data, and access. These let the agency understand your business, target the right people, convert with real offers, produce on-brand creative, build on what’s worked, and actually run and measure campaigns. Each input you provide is time the agency doesn’t spend rediscovering it on your budget.
Q3. Why do agencies start slowly on LinkedIn Ads?
Often because of a vague brief, not the agency. Without clear goals, ICP, offers, historical data, and access, the agency spends the first weeks reconstructing what the client could have provided — figuring out targeting, past performance, and success metrics before doing real work. Slow starts are frequently a briefing failure that gets mistaken for agency underperformance.
Q4. What goals should you set with a LinkedIn Ads agency?
Business outcomes defined precisely — pipeline targets, cost per SQL, or revenue goals — along with your sales cycle and attribution approach, rather than vanity metrics. The agency optimizes toward whatever you set, so a cost-per-lead target yields cheap leads while a cost-per-SQL target yields qualified pipeline. Define success as the outcomes that matter to your business.
Q5. Should you give an agency your historical LinkedIn Ads data?
Yes — it’s one of the highest-value inputs. Historical data lets the agency build on what you’ve already learned (which audiences and offers worked, what didn’t) rather than relearning it on your budget. Without it, they start from zero and repeat experiments you’ve run. It compresses the agency’s learning curve dramatically.
Q6. What access does a LinkedIn Ads agency need?
Access to your ad account so they can run campaigns, your Insight Tag and conversion tracking so they can measure, and your analytics so they can see downstream results. Without account and tracking access, the agency can’t start or measure anything. Providing access early is a prerequisite for them doing any actual work.
Q7. How do you set an agency up for success on LinkedIn?
Provide a thorough handover — goals, ICP, offers, brand, historical data, and access — plus a point of contact, a feedback loop, and alignment with your sales team so leads are worked and outcomes tracked. The upfront investment in a complete brief is the single most effective thing you can do to get results from an agency quickly.
Q8. What’s the difference between an agency brief and a creative brief?
An agency brief sets up the whole engagement — goals, ICP, offers, data, and access — so the agency understands your business and can perform. A creative brief specifies the inputs for a single ad — audience, message, proof, and CTA. The agency brief is about enabling the relationship; the creative brief is about producing individual ads.
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