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Article · by Yurii Oksamytnyi

LangChain's Jev tool-call gate

Tool output stays out of the classifier's input.

Yurii Oksamytnyi

@YuriODev

🛡️ @LangChainAI shipped Jev as a tool-call gate and model router. Key detail: tool output is excluded from the classifier input, so fetched content can't authorise its own execution. Steal that rule. langchain.com/blog/building-…

LangChain tool-call gate flow: agent, tool call, Jev gate asking whether it is safe, then run or block. Rule: tool output is excluded from the classifier input so fetched content can't authorise its own execution.

Sep 24, 2026 · 0 likesOpen on X

Yurii Oksamytnyi notes that LangChain shipped Jev as a tool-call gate and model router, and singles out one rule: tool output is excluded from the classifier input, so fetched content cannot authorise its own execution.

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