I Saved My Friend's Client by building a case in 10 mins. Here's how:

The Time I Used This to Help a Friend

A friend called me in a bit of a panic. One of his clients was threatening to leave - said the email marketing wasn't performing - and he had a call in a few hours to make the case for why they should stay. He needed numbers. He needed a business case. And he needed it fast.

I jumped in.

The client was a fashion label running two separate Klaviyo accounts - one for their local market, one for international - each with its own currency and 12 months of campaign history. Reconciling that manually would have taken most of the day. Exporting CSVs, normalising currencies, pulling campaign reports one by one.

Instead, I connected both accounts to Claude via the Klaviyo MCP. Set up a new project, ran a quick test to confirm the tool calls were working, gave Claude the context - what we were looking for, what needed to be aggregated, what the objective was. About 10 minutes later, we had the full picture across 70-plus campaigns and five flows.

I verified the numbers myself, checked for currency discrepancies, and validated the totals against the source data. What came back was genuinely strong:

• Average open rate of 47% across all campaigns, roughly double the industry benchmark of 20-25%

• Automated flows generating revenue even during periods they were switched off - a sign of what a properly maintained programme could do

• A 12-month return of 5.5x: every pound spent on email came back as five and a half

My friend went into that call with a clean, costed business case. No spreadsheets, no frantic exports, no piecing things together across tabs. The data was live, the numbers held up, and he kept the client.

A year ago that would have been a half-day job, minimum. This took under an hour, most of which was validation.

Here's exactly what made it possible, and how you can set it up yourself.

What Is an MCP and Why Does It Matter?

MCP stands for Model Context Protocol. It's a standard that lets AI models like Claude connect directly to external tools and data sources. Think of it as giving Claude a live feed into your Klaviyo account rather than pasting screenshots or copying numbers manually.

Once it's set up, Claude can query your Klaviyo data in real time. Ask it a question, it fetches the answer.

Setting It Up (Takes About 5 Minutes)

The simplest way is through Claude's built-in connector. No API keys, no config files - it uses OAuth, so Klaviyo handles the authentication securely.

You'll need a Claude Pro, Max, Team, or Enterprise plan, and an Owner, Admin, or Manager role on your Klaviyo account.

1. In Claude, go to Settings > Connectors

2. Click Browse Connectors

3. Search for Klaviyo and click connect

4. Click Approve to grant Claude access

5. Review the Klaviyo permissions and click Allow

That's it. Claude now has live access to your Klaviyo account.

If you manage multiple Klaviyo accounts, use the custom connector option instead. Go to Settings > Connectors > Add custom connector, set the name (e.g. "Klaviyo - Client Name") and use https://mcp.klaviyo.com/mcp as the remote MCP server URL. Repeat for each account.

What Claude Can Actually See

Once connected, Claude has access to:

• Campaign performance - open rates, click rates, revenue attributed, send counts

• Flow performance - each step in your automations, conversion data, revenue generated

• Metrics - raw event data across channels and integrations

• Profiles - subscriber data, segment membership

• Lists and segments - who's in them, sizes

This isn't hypothetical. I can type "show me which flows generated the most revenue last month" and get an actual answer instead of spending 20 minutes clicking through dashboards.

What I Actually Use It For

Diagnosing underperforming flows

I had a client whose welcome sequence had a 4% click rate on email 2. I asked Claude: "Look at the welcome flow performance for the last 90 days - which email has the lowest click rate and what's the subject line?" Got the answer in 10 seconds. Previously that was a 10-minute process involving three different Klaviyo screens.

Writing performance reports

I pull a client's campaign data for the month, ask Claude to summarise the wins and losses, and get a first draft in my tone. Still needs editing, but the foundation is done in minutes rather than built from scratch.

Spotting patterns across data

"Which segments have the highest revenue per recipient?" - this used to require building a custom report in Klaviyo. Now it's a single question in conversation.

What It Can't Do (Yet)

By default, the connector is read-and-write - Claude can query your data but also create campaigns and email templates if you ask it to. If you only want read access, you can set that in the custom connector settings. Either way, Claude won't do anything you don't explicitly ask it to.

It's also worth knowing that some tools involving user-generated content (like reading profile data) can expose that content to the model. Klaviyo flags which tools carry that risk in their docs, so worth reviewing if that's a concern for your use case.

Who This Is For

If you're a marketing manager, consultant, or agency owner who spends meaningful time each week interpreting Klaviyo data - set this up. The time saving is real. It won't replace your judgement on what to do with the data, but it removes the friction of retrieving it.

Set it up once, and your next Klaviyo deep dive takes a fraction of the time it used to.

Want to Talk It Through?

If you'd like help setting this up or want to explore what AI could do for your marketing stack, book a free 30-minute call. No pitch - just a practical conversation about where to start.

Book a call