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

Defined in: [src/types/messages.ts:829](https://github.com/strands-agents/harness-sdk/blob/57d070582e9bd93afb549b4d2f976ce0dbaf03b6/strands-ts/src/types/messages.ts#L829)

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