Article · Safety & guardrails
LangChain's Jev tool-call gate
Tool output stays out of the classifier's input.
Open langchain.com ↗How builders describe it
Tool output stays out of the classifier's input. Routing between models, and blocking risky tool calls with a Jev decision.
LangChain's langchain-typesafe integration exposes Jev as a TypeSafeClassifier plus experimental model-routing and auto-mode middleware that screens risky tool calls before execution.
The decision Jev makes
Allow, flag or escalate a message, tool call or action.
Where it fits
Screening messages, tool calls and outputs before they cause trouble. Jev gives a fast, calibrated verdict that can sit in front of every request or agent action. All 229 safety & guardrails projects →
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