Generate and auto-evaluate Facebook ad headlines using GPT-4o-mini

Generate and Auto-Evaluate Facebook Ad Headlines using GPT-4o-mini

Built with n8n + OpenAI

This workflow captures a product description, generates ad headlines, evaluates them with custom criteria, decides whether another draft is needed, and finally sends the best version via Gmail.

---

⚡ Section 1: Capture the Brief & Build the Prompt

📝 FormTrigger\CopywritingBrief → A simple form asks: “What is your product about?” ⚙️ Set\PromptForHeadline → Prepares the input by appending the instruction: “Write a Facebook ad headline for this product:”

Benefit: Ensures consistent, structured prompts so the AI receives clear context every time.

---