curso-langchain/slides/pages/agents/06.md

layout

layout
default

systemPrompt: Configurando el Comportamiento

String simple:

const agent = createAgent({
  model: "mistral:mistral-large-latest",
  tools: [weatherTool],
  systemPrompt: "Eres un asistente meteorológico. Sé conciso y preciso.",
});

SystemMessage (para features avanzados como cache de Anthropic):

import { SystemMessage } from "langchain";

const agent = createAgent({
  model: "anthropic:claude-sonnet-4-6",
  tools: [weatherTool],
  systemPrompt: new SystemMessage({
    content: [
      { type: "text", text: "Eres un experto en clima...", cache_control: { type: "ephemeral" } }
    ],
  }),
});