Generate Google Ad Copy Automatically with Claude 3.5, Channable & Relevance AI

🚀 Channable + Google Ads + Relevance AI: Scalable AI Workflow for Automated Ad Copy Generation & Publishing

🧩 Overview

This workflow automates the entire ad creation process for Google Ads by integrating product data, AI-generated copy, compliance checks, and publication into your marketing pipeline.

It connects n8n, Relevance AI, Google Sheets, and optionally Channable to:

Fetch product data from your catalog Generate Google Text Ad headlines and descriptions using Relevance AI Validate character limits and ensure Google Ads compliance Route non-compliant ads to a Slack review channel Save compliant, ready-to-publish ads in Google Sheets Notify your marketing team automatically after each generation cycle

🧠 Key Benefits

✅ 100% automated ad copy pipeline ✅ AI-generated, human-quality Google Ads text ✅ Built-in compliance verification (Google Ads policy) ✅ Google Sheet integration for team review ✅ Daily automatic schedule (zero manual effort) ✅ Slack alerts for QA and transparency ✅ Modular design — extendable for Shopping and Performance Optimization ✅ Scalable for 10 → 10,000+ product ads

⚙️ System Architecture

Tech Stack

n8n** – Automation Orchestrator Relevance AI** – AI tools for copy generation and policy compliance Google Sheets** – Data storage and team collaboration Slack** – Real-time alerts and notifications (Optional) Channable – Product feed integration

🧭 Workflow Logic

Daily Trigger (00:00) ⬇️ 1️⃣ Get Product Feed (Channable or custom API) ⬇️ 2️⃣ Split Into Batches (50 products each) ⬇️ 3️⃣ Generate Ad Copy (Relevance AI tool → Claude 3.5 prompt) ⬇️ 4️⃣ Validate Character Limits (JS node: max 30 headline / 90 description) ⬇️ 5️⃣ Compliance Check (Relevance AI agent → Google Ads policies) ⬇️ 6️⃣ IF Compliant → CSV / Google Sheets ↳ ❌ Non-Compliant → Slack Alert ⬇️ 7️⃣ Aggregate Batches + Generate CSV ⬇️ 8️⃣ Save to Google Sheets (“Generated Ads” tab) ⬇️ 9️⃣ Slack Notification → Summary Report

📋 Environment Variables

Set these in n8n → Settings → Variables → Add Variable

Copy-paste from your ENVIRONMENT_VARIABLES_CORRECTED.txt.

Includes:

✅ Relevance AI region, API key, tool & agent IDs ✅ Google Ads, Merchant Center, and Sheets credentials ✅ Slack channel name ✅ Optional Channable endpoint

Example:

RELEVANCE_AI_API_URL=https://api-f1db6c.stack.tryrelevance.com/latest RELEVANCE_TOOL_AD_COPY_ID=bueQG8io04dw RELEVANCE_AGENT_COMPLIANCE_ID=xT29mQ4QKsl GOOGLE_SHEET_ID=1q2w3e4r5t6y7u8i9o0p SLACK_CHANNEL=#google-ads-automation

🏗️ Node-by-Node Breakdown

| Node | Description | Endpoint / Logic | | -------------------------------------- | ----------------------------------------------- | ----------------------------------------------------------------------------- | | 🕓 Schedule Trigger | Runs daily at 00:00 | Cron 0 0 * * * | | 📦 Get Product Feed | Pulls product data from Channable or custom API | GET {{$env.CHANNABLE_API_URL}}/v1/projects/{{$env.PROJECT_ID}}/items | | 🧮 Split Into Batches | Processes 50 products at a time | Avoids rate limits | | ✍️ Generate Ad Copy (Relevance AI) | Calls AI tool for each product | POST {{$env.RELEVANCE_AI_API_URL}}/tools/google_text_ad_copy_generator/run | | 🔍 Validate Character Limits | JS validation (≤30 headline / ≤90 description) | Truncates smartly | | 🧠 Compliance Check Agent | Verifies Google Ads compliance | POST {{$env.RELEVANCE_AI_API_URL}}/agents/google_ads_compliance_checker/run | | ⚖️ IF Compliant | Routes APPROVED vs REJECTED | "contains 'APPROVED'" | | 💾 Format for CSV | Formats compliant ads for export | Maps ID, headline, desc, URLs | | 📊 Aggregate Batches | Combines all results | Merges datasets | | 🧱 Generate CSV File | Converts JSON → CSV | Escaped string-safe format | | 📑 Save to Google Sheets | Saves reviewed ads | Sheet: Generated Ads | | 📢 Slack Notification (Success) | Posts completion summary | Shows ad count, timestamp | | 🚨 Slack Alert (Non-Compliant) | Notifies team for review | Includes issues, category |

🔑 API Authentication Setup

🔹 Relevance AI

Create “HTTP Header Auth” credential

Header Name: Authorization

Header Value: Bearer {{$env.RELEVANCE_AI_API_KEY}} 🔹 Google Sheets

Credential type: “Google OAuth2 API” Scopes:

https://www.googleapis.com/auth/spreadsheets

https://www.googleapis.com/auth/drive.file 🔹 Slack

Create Slack App → Add Bot Token Scopes → chat:write Paste token in n8n “Slack API” credential.

🔹 (Optional) Channable

Header Auth:

Bearer {{$env.CHANNABLE_API_TOKEN}}

🧩 Google Sheet Template

Sheet name: Generated Ads

Columns:

| product_id | headline | description | final_url | display_url | generated_at |

Optional: Add compliance_status or notes columns for QA.

⚙️ Testing Procedure

Manual Trigger: Disable the schedule → click “Execute Workflow”. Batch Size: Start small (3 products). Expected Output:

✅ Ad copy generated ✅ Character limits validated ✅ Slack alerts for rejects ✅ Google Sheet filled

Check logs in Executions for errors. Re-enable the cron trigger after successful validation.

🧾 Example Output

| product_id | headline | description | final_url | display_url | generated_at | | ---------- | ------------------ | --------------------------------------------- | ------------------------------------------------ | ----------- | -------------------- | | 12243 | “Eco Bamboo Socks” | “Soft, breathable comfort for everyday wear.” | https://shop.com/socks | shop.com | 2025-10-22T00:00:00Z |

📬 Slack Alert Templates

✅ Success Notification

✅ Google Ads Generation Complete

📊 Summary: • Total Ads Generated: 50 • Saved to Google Sheets: Generated Ads • Timestamp: 2025-10-22T00:00:00Z

⚠️ Non-Compliant Alert

⚠️ Non-Compliant Ad Flagged

Product: Bamboo Socks Issues: Contains “Free Shipping” Headline too long

Timestamp: 2025-10-22T00:00:00Z

🧰 Maintenance & Monitoring

| Frequency | Task | | --------- | -------------------------------- | | Daily | Check Slack alerts for rejects | | Weekly | Review ad performance metrics | | Monthly | Update Relevance AI prompts | | Quarterly | Refresh API tokens and variables |

📊 Success Metrics

✅ Compliance approval rate: >85% 🚫 Disapproval rate: <5% 📈 CTR improvement: +15–25% ⏱️ Time saved: 10–15 hours/week 🌐 Scalable: 1,000+ ads/day

🪜 Next Steps

Deploy and monitor for 7 days. After 30 days → activate Workflow 2: Performance Optimization Loop. Extend to Shopping Feed Optimization. Add multi-language generation using Relevance AI. Integrate Google Ads API publishing (full automation).

🔗 Resources

n8n Docs Relevance AI Docs Google Ads API Merchant API Channable Help

🎉 Conclusion

You now have a production-ready, scalable AI-powered ad generation system integrating Channable, Google Ads, and Relevance AI — built entirely on n8n.

This delivers:

💡 AI creativity at scale ✅ Google Ads policy compliance ⚙️ Hands-free daily automation 📊 Transparent reporting and collaboration

> Start small → validate → scale to 10,000+ ads per day. > Within weeks, you’ll have a self-learning, always-on ad pipeline driving consistent performance.