LangChain: How We Build Evals for Deep Agents — Methodology for Measuring Agent Behavior

LangChain Blog·medium signal

LangChain published their internal methodology for building evaluations for 'deep agents' — agents that take many steps and make complex decisions. The approach emphasizes directly measuring specific agent behaviors rather than end-to-end outcomes, with guidance on sourcing eval data, creating targeted metrics, and running well-scoped experiments over time. Practical framework for any team deploying production agents.