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 instruct