> 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.

# promptAddSubsection

> Add a subsection to an existing prompt section.

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

Add a subsection to an existing section.

## **Parameters**

**`parentTitle`** `string` — required

Title of the parent section.

---

**`title`** `string` — required

Subsection heading.

---

**`opts`** `object`

Optional subsection content.

---

**`opts.body`** `string`

Subsection body text.

---

**`opts.bullets`** `string[]`

Subsection bullet points.

---

## **Returns**

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

## **Example**

```typescript {7}
import { AgentBase } from '@signalwire/sdk';

const agent = new AgentBase({ name: 'support', route: '/support' });
agent.promptAddSection('Capabilities', {
  body: 'You can help with the following:',
});
agent.promptAddSubsection('Capabilities', 'Orders', {
  body: 'Look up order status, process returns and exchanges.',
});
agent.promptAddSubsection('Capabilities', 'Billing', {
  body: 'Check account balances and explain recent charges.',
});
await agent.serve();
```

> Add a subsection to an existing prompt section.