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# systemPrompt: Configurando el Comportamiento

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**String simple:**

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

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**SystemMessage (para features avanzados como cache de Anthropic):**

```typescript
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" } }
    ],
  }),
});
```

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</div>