LangChain explains where Jev fits in an agent loop and shows classifier, model-router, and Auto Mode middleware examples. Its guardrail example checks proposed tool calls for risky actions before the agent executes them.
Original by Sydney Runkle and Hunter LovellGuardrailsLangChain articleOriginal published Source reviewed
Before you dive in
What you’ll find in the original
Keep the generative agent for reasoning and writing; use Jev for small structured judgments.
Model routing chooses from criteria you set, while middleware can check a tool call before execution.
A model risk signal is not a substitute for application permissions or human approval.
Worth knowing
The post shows integration patterns, not a proof that every risky action will be detected.