If you're a performance marketer or growth lead, you know the drill: Google Ads reports in one tab, Meta Ads in another, and a massive spreadsheet in the middle trying to reconcile the mess. ROAS is climbing in one channel and falling in the other. Budgets get reallocated on gut feel. And by the time you clean the data, the week is already over.
GoMarble MCP fixes this entire workflow
It connects both platforms in one view, uses Claude to analyze your data, and tells you—clearly—where your budget is being wasted, where your ads are underperforming, and how to fix it. No CSVs. No manual dashboards. And no cost.
In this guide, we'll break down:
Why cross-channel ad visibility is critical for profitable growth
How GoMarble MCP + Claude automates your ad analysis
Real use cases (with prompts and responses)
Setup walkthrough
Who should be using it
FAQs for deeper clarity
Why Multichannel Ad Auditing Matters (And What You Lose Without It)
Each ad platform is designed to maximize its own performance. Google spreads budget across Search, Display, YouTube, and Performance Max. Meta focuses on audience buckets and creatives. None of these tools are built to show you the whole picture.
Siloed reporting leads to three major problems:
Invisible Waste: You may be retargeting the same user twice, bidding against yourself, or promoting the same product across two channels without coordination.
Slow Decisions: Analysts spend more time cleaning and exporting than analyzing. That delay means wasted spend runs unchecked for days.
Lack of Strategic Clarity: Your CEO asks, "Are we spending wisely?" You don’t have one answer. You have two partial ones.
Multichannel reporting isn't a luxury anymore. It's a survival skill in modern paid media.
GoMarble MCP + Claude: How It Works
GoMarble MCP (Multi-Channel Performance) is a free tool that connects your Google and Meta ad accounts via secure OAuth. It pulls recent campaign data, aligns metrics like ROAS, spend, CAC, and CVR, and pipes that data into Claude—your AI analyst.
Claude reads the data like a strategist. You can ask:
"Why did ROAS drop last week?"
"Which campaigns have the worst CAC?"
"Where are we spending on overlapping audiences?"
Claude answers in plain English, using actual campaign data and trends. No jargon. No dashboards to decode.
All of this happens locally on your machine. Your data stays yours.
Key Features That Set It Apart
Detailed Use Cases: From Question to Impact
Root-Cause Analysis
Prompt: "Why did Meta ROAS fall 30% yesterday?"
Response: "Creative fatigue on two top-spend ad sets. CTR dropped from 1.9% to 0.6%."
Impact: Replace creatives before your Monday stand-up.Budget Reallocation Simulation
Prompt: "What if I move 20% of Google spend to Meta this week?"
Response: "Expected ROAS uplift of 17% due to lower CPC and higher CVR on Meta."
Impact: You justify a media shift with data, not gut.Audience Overlap Cleanup
Prompt: "Where are we double-bidding across channels?"
Response: "5.2% of your weekly spend targets the same segments on both platforms."
Impact: Consolidate efforts, reduce CPC.Weekly Summary
Prompt: "Give me a 7-day PDF report for both platforms."
Response: Download-ready file with headline metrics, trends, and actionable tips.
Setup Walkthrough: From Zero to Insight in 5 Minutes
Install Claude: Download the Claude desktop app (Mac or Windows).
Install GoMarble MCP: Run the installer and allow permissions.
Enable the Server: Open Claude → Tools → Enable "Facebook MCP Server"
Connect Your Accounts: Secure OAuth login to Google & Meta.
Ask Your First Question: "Where did we waste budget last week?"
That's it. No onboarding. No subscription. No credit card.
Who Should Be Using This
Performance Marketers struggling with multiple platforms
Agency Teams managing dozens of clients
Founders or CMOs seeking better spend visibility
Media Buyers trying to optimize blended ROAS fast
If you're making budget decisions with partial data, you need this tool.
FAQs
What is the best free tool to audit Google and Meta Ads together?
GoMarble MCP is currently the only open-source, free tool that lets you analyze both Google and Meta ad accounts in one view with natural-language AI.
Can Claude change bids or budgets for me?
Not yet. The current version is read-only to prevent errors. Write-access features are in private beta.
How does GoMarble MCP keep my data secure?
OAuth tokens stay on your computer. Data is never stored or sent to GoMarble servers. You control and revoke access anytime.
What kinds of insights can Claude generate?
Campaign-level ROAS drops, CPC changes, creative fatigue, keyword waste, overlapping audiences, and more—all through natural-language queries.
Do I need to pay for Claude Pro?
Only if you want a longer memory window. All core analysis features work with the free Claude app.
Can I use this with multiple ad accounts?
Yes. You can connect multiple MCCs or Meta BMs and group them by client or region.
Ready to Stop Guessing and Start Optimizing?
If you run paid campaigns on Google or Meta, there’s almost certainly budget waste hiding in your accounts. GoMarble MCP surfaces it in minutes—with no subscription, no spreadsheet, and no learning curve.
Plug in your accounts. Ask a question. Get the answers.