# clientHeaderTrack | @aa-sdk/core

> Overview of the clientHeaderTrack function from @aa-sdk/core

{/* This file is auto-generated by TypeDoc. Do not edit manually. */}

```ts
function clientHeaderTrack<X>(client, crumb): X;
```

Defined in: [aa-sdk/core/src/client/addBreadcrumb.ts:20](https://github.com/alchemyplatform/aa-sdk/blob/main/aa-sdk/core/src/client/addBreadcrumb.ts#L20)

Add a crumb to the breadcrumb.

## Type Parameters

<table>
  <thead>
    <tr>
      <th align="left">Type Parameter</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>
        `X` *extends* `object`
      </td>
    </tr>
  </tbody>
</table>

## Parameters

<table>
  <thead>
    <tr>
      <th align="left">Parameter</th>
      <th align="left">Type</th>
      <th align="left">Description</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>
        `client`
      </td>

      <td>
        `X`
      </td>

      <td>
        Clients are somethings like viem, that we are adding breadcrumbs to, and could be owning the transport. Usually a alchemy client.
      </td>
    </tr>

    <tr>
      <td>
        `crumb`
      </td>

      <td>
        `string`
      </td>

      <td>
        The crumb to add to the breadcrumb
      </td>
    </tr>

  </tbody>
</table>

## Returns

`X`

The updated client