summarizationMiddleware

import { summarizationMiddleware } from "langchain";
import { createAgent } from "langchain";

// Single condition: trigger if tokens >= 4000 AND messages >= 10
const agent1 = createAgent({
  llm: model,
  tools: [getWeather],
  middleware: [
    summarizationMiddleware({
      model: new ChatOpenAI({ model: "gpt-4o" }),
      trigger: { tokens: 4000, messages: 10 },
      keep: { messages: 20 },
    })
  ],
});

// Multiple conditions: trigger if (tokens >= 5000 AND messages >= 3) OR (tokens >= 3000 AND messages >= 6)
const agent2 = createAgent({
  llm: model,
  tools: [getWeather],
  middleware: [
    summarizationMiddleware({
      model: new ChatOpenAI({ model: "gpt-4o" }),
      trigger: [
        { tokens: 5000, messages: 3 },
        { tokens: 3000, messages: 6 },
      ],
      keep: { messages: 20 },
    })
  ],
});