> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# setPromptText

> Set the agent's system prompt as a raw text string.

[ai-prompt]: /docs/swml/reference/calling/ai/prompt

[swml-prompt-reference]: /docs/swml/reference/calling/ai/prompt

[ref-agentbase]: /docs/server-sdks/reference/typescript/agents/agent-base

Set the agent's system prompt as a raw text string. This is the simplest way to
configure what the AI knows and how it behaves.

> **Info**
>
> This sets the SWML [`ai.prompt`][ai-prompt] field. See the
> [SWML prompt reference][swml-prompt-reference] for details on prompt behavior.

> **Warning**
>
> Mixing raw text prompts with POM-based prompt sections (`promptAddSection()`) in the
> same agent may produce unexpected results. Use one approach or the other for the main
> prompt. Contexts can still be used alongside either approach.

## **Parameters**

**`text`** `string` — required

The complete system prompt text. Supports multi-line strings.

---

## **Returns**

[`AgentBase`][ref-agentbase] -- Returns `this` for method chaining.

## **Example**

```typescript {4}
import { AgentBase } from '@signalwire/sdk';

const agent = new AgentBase({ name: 'support', route: '/support' });
agent.setPromptText(`
You are a customer support agent for Acme Corp.
You help customers with billing questions, order tracking, and returns.
Always be polite and professional.
`);
await agent.serve();
```

> Set the agent's system prompt as a raw text string.