AI Agents & LangChain in n8n · 40 min
Guardrails, evals & testing agents
Regex filters, LLM-as-judge scoring, and repeatable eval workflows before shipping an agent.
Key concepts
- Input/output guardrails
- LLM-as-judge pattern
- Golden-set regression testing
Exercise
Build a 10-question golden set and an eval workflow that scores each agent response 1-5.