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

Defined in: [src/types/messages.ts:829](https://github.com/strands-agents/harness-sdk/blob/9062527eeda294e2f1381f385b36d0ba2fab9492/strands-ts/src/types/messages.ts#L829)

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