public class EchoAgent extends LocalAgent {
  public EchoAgent() { super("echo", new State(), null, "You are echo."); }

  @Override
  protected void run(RunAgentInput input, AgentSubscriber sub) {
    var runId = input.getRunId();
    emitEvent(EventFactory.runStartedEvent(input.getThreadId(), runId), sub);

    var messageId = UUID.randomUUID().toString();
    emitEvent(EventFactory.textMessageStartEvent(messageId, "assistant"), sub);
    emitEvent(EventFactory.textMessageContentEvent(messageId, "Hello"), sub);
    emitEvent(EventFactory.textMessageEndEvent(messageId), sub);

    emitEvent(EventFactory.runFinishedEvent(input.getThreadId(), runId), sub);
  }
}