toolEmulatorMiddleware

import { toolEmulatorMiddleware } from "@langchain/langchain/agents/middleware";
import { createAgent } from "@langchain/langchain/agents";

const middleware = toolEmulatorMiddleware();

const agent = createAgent({
  model: "openai:gpt-4o",
  tools: [getWeather, getUserLocation, calculator],
  middleware: [middleware],
});

const middleware = toolEmulatorMiddleware({
  tools: ["get_weather", "get_user_location"]
});

const middleware = toolEmulatorMiddleware({
  tools: ["get_weather"],
  model: "anthropic:claude-sonnet-4-5-20250929"
});

const middleware = toolEmulatorMiddleware({
  tools: [getWeather, getUserLocation]
});