Infrastructure

LangChain's engineering post, two days after launch, wiring Jev into an agent harness as middleware in two places: choosing the model per request, and checking a tool call for risk before it runs, the same job Vercel's fx safety reviewer does. Both are LangChain middleware.

Sydney Runkle and Hunter Lovell, LangChain, in langchain.com

A simple lookup doesn't need the same model as a difficult debugging task. Model-routing middleware lets Jev assess the request and choose a model based on criteria you define, so fast and inexpensive for straightforward tasks, more capable for complex ones.

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AutoModeMiddleware uses Jev to check tool calls for risky decisions it may take, and block calls before the tool executes.

Read it in full on langchain.com →