# toSpecTokenUsage

# Function: toSpecTokenUsage()

```ts
function toSpecTokenUsage(usage, options?): object;
```

Defined in: [packages/ai/src/utilities/ag-ui-usage.ts:47](https://github.com/TanStack/ai/blob/main/packages/ai/src/utilities/ag-ui-usage.ts#L47)

## Parameters

### usage

`TokenUsage`

### options?

`ToSpecTokenUsageOptions`

## Returns

`object`

### leftover?

```ts
optional leftover?: TokenUsageLeftover;
```

### usage

```ts
usage: SpecTokenUsage[];
```