Agent as tool update streaming (.NET)

[Mnacco]

I recently changed from using handoffs to agents as tools and previously I was getting updates in chunk (using AgentRunUpdateEvent).

However, after converting to agents as tools, I get one big chunk of text after small delay and then it continues to produce small updates as previously.

var agentList = new List<AITool>();

// I create multiple agents and add them to the list as AsAIFunction()

var entryPointAgent = _chatClient.CreateAIAgent(
    name: routingAgentName,
    description: routingAgentDescription,
    instructions: TroutingAgentInstructions,
    tools: agentList);

Workflow workflow = AgentWorkflowBuilder.BuildSequential(entryPointAgent);

Then I call run and wait for streaming updates

var messages = new[]
{
    new ChatMessage(ChatRole.User, input)
};

StreamingRun run = await InProcessExecution.StreamAsync(_workflow, messages);

await run.TrySendMessageAsync(new TurnToken(emitEvents: true));

await foreach (WorkflowEvent evt in run.WatchStreamAsync().ConfigureAwait(false))

I get couple of sentences immediately, then updates start coming through.

Is there something I am doing wrong? Or is this intended behavior?