> 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.

# onSwmlRequest

> Lifecycle hook called on every SWML request before rendering.

[render-swml]: /docs/server-sdks/reference/typescript/agents/agent-base/render-swml

Lifecycle hook called on every incoming SWML request before the SWML document is
rendered. The default implementation is a no-op. Override this method in a
subclass to inspect or modify agent state before each call is processed.

Common uses include loading caller-specific data from a database, adjusting
prompts based on request metadata, or logging request details.

## **Parameters**

**`rawData`** `Record<string, unknown>` — required

The parsed request body. Contains call metadata such as `call_id`,
`caller_id_number`, `caller_id_name`, and any custom SIP headers.

---

**`callbackPath`** `string`

Optional callback path from the request body (`callback_path` field), when
the request was triggered via a callback URL.

---

**`context`** `any`

The raw Hono request context (`c`), providing access to headers, query
parameters, and the underlying HTTP request.

---

## **Returns**

`Record<string, unknown> | void | Promise<Record<string, unknown> | void>` --
Return a modifications object to merge into the AI verb config before
rendering. `global_data` is deep-merged; all other keys override AI config
fields directly. Return `void` / `undefined` to render without
modifications.

> **Tip**
>
> For most per-request customization scenarios, prefer
> [`setDynamicConfigCallback()`](/docs/server-sdks/reference/typescript/agents/agent-base/set-dynamic-config-callback)
> which provides a higher-level interface with access to query params, body, headers,
> and an ephemeral agent copy.

## **Example**

```typescript {9}
import { AgentBase } from '@signalwire/sdk';

class PersonalizedAgent extends AgentBase {
  constructor() {
    super({ name: 'personalized', route: '/personalized' });
    this.setPromptText('You are a helpful assistant.');
  }

  override async onSwmlRequest(
    rawData: Record<string, unknown>,
  ): Promise<void> {
    const callerId = (rawData.caller_id_number as string) ?? 'unknown';
    console.log(`Incoming call from ${callerId}`);
    this.updateGlobalData({ caller_number: callerId });
  }
}

const agent = new PersonalizedAgent();
await agent.serve();
```

> Lifecycle hook called on every SWML request before rendering.