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n8n AI Agent: Let the Model Fill Your Google Sheets Columns. Make the System Prompt and the Header Row One Schema

A chatbot talks. An agent does things. The smallest useful agent I know of in n8n does one thing a chatbot can't: you ask it for three social media post ideas, then you say "save those to the sheet"…

  • Align system prompt with Google Sheet header row for consistent data formatting
  • Design clear schema for AI-generated data, e.g., Platform, Post Topic, Hook
  • Use system message to instruct AI to return data in exact same format using $fromAI()

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