Eval workflow for agentic builders: fork any prompt through baseline vs scaffolded agents, blind third-party judge.

📰 Dev.to AI

Learn to A/B test prompts using baseline and scaffolded agents with a blind third-party judge using an n8n eval workflow

intermediate Published 22 Apr 2026
Action Steps
  1. Build an n8n workflow with a chat trigger to input prompts
  2. Fork the prompt through two agents: plain GPT-4o and GPT-4o with a reasoning scaffold
  3. Configure a blind Gemini evaluator as a third-party judge
  4. Test the workflow with sample prompts to compare agent performance
  5. Apply the eval workflow to custom agent tasks to evaluate their effectiveness
Who Needs to Know This

Developers and researchers working with AI agents can benefit from this workflow to evaluate and compare the performance of different agents on various tasks

Key Insight

💡 Using a blind third-party judge to evaluate agent performance helps reduce bias and increases the reliability of the results

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A/B test AI prompts with baseline & scaffolded agents using n8n workflow!
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