47 lines
991 B
Markdown
47 lines
991 B
Markdown
---
|
|
layout: default
|
|
---
|
|
|
|
# Middleware: Limitar Historial (Trim)
|
|
|
|
<div class="mt-4 text-xs">
|
|
|
|
<v-click>
|
|
|
|
```typescript
|
|
import { RemoveMessage } from "@langchain/core/messages";
|
|
import { createAgent, createMiddleware } from "langchain";
|
|
import { MemorySaver, REMOVE_ALL_MESSAGES } from "@langchain/langgraph";
|
|
|
|
const trimMessages = createMiddleware({
|
|
name: "TrimMessages",
|
|
beforeModel: (state) => {
|
|
const messages = state.messages;
|
|
if (messages.length <= 5) return; // No recortar si hay pocos
|
|
|
|
// Mantener primer mensaje + últimos 4
|
|
const firstMsg = messages[0];
|
|
const recentMsgs = messages.slice(-4);
|
|
const newMessages = [firstMsg, ...recentMsgs];
|
|
|
|
return {
|
|
messages: [
|
|
new RemoveMessage({ id: REMOVE_ALL_MESSAGES }),
|
|
...newMessages,
|
|
],
|
|
};
|
|
},
|
|
});
|
|
|
|
const agent = createAgent({
|
|
model: "mistral:mistral-large-latest",
|
|
tools: [],
|
|
middleware: [trimMessages],
|
|
checkpointer: new MemorySaver(),
|
|
});
|
|
```
|
|
|
|
</v-click>
|
|
|
|
</div>
|