Talks the native Anthropic Messages format to Bedrock InvokeModel / InvokeModelWithResponseStream, unlocking Anthropic-specific features that the Converse API cannot express — tool search with deferred tool loading, prompt caching via cache_control, and structured outputs — while keeping data inside the AWS boundary. Authenticates with the standard AWS credential chain (IRSA, Pod Identity, instance profiles, env vars) via aws-sdk-core.