```ts
type GuardImageFormat = "png" | "jpeg";
```

Defined in: [src/types/messages.ts:827](https://github.com/strands-agents/harness-sdk/blob/e4284b561624d906e361535ef1f1adcd5ce3461b/strands-ts/src/types/messages.ts#L827)

Image format for guard content. Only formats supported by Bedrock guardrails.