## [![Every Tenant Has a Past: Evaluating LangGraph Agents](/blog/assets/images/hero-image-e1993202d8559fb1a56a7563aec98d0b.webp)](/blog/eval-agents-real-state/.md)[Every Tenant Has a Past: Evaluating LangGraph Agents](/blog/eval-agents-real-state/.md)

Fork a customer's entire LangGraph agent state, replay their conversations through a prompt change, and judge it head-to-head before you ship to prod.

David Myriel · June 30, 2026 ·

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13 min read