.NET: A2A AgentRunOptions are not passed on #2974

var a2aClient = new A2AClient(new Uri(agentUrl));
var agent = a2aClient.GetAIAgent();

var messages = new List<ChatMessage>
{
    new ChatMessage(ChatRole.User, "test Tell me something interesting.")
};

var dict = new AdditionalPropertiesDictionary
{
    { "model_extras", new { stream_options = new { include_usage = true } } }
};
var options = new AgentRunOptions { AdditionalProperties = dict };

var result = await agent.RunAsync(messages, thread: null, options: options);

builder.Services.AddSingleton<TestAgent>();

var app = builder.Build();

var testAgent = app.Services.GetRequiredService<TestAgent>();
app.MapA2A(testAgent, "/agent/test", agentCard: new()
{
    Name = "Test Agent",
    Description = "A test agent for usage information",
    Version = "1.0.0",
});

public override async Task<AgentRunResponse> RunAsync(IEnumerable<ChatMessage> messages, AgentThread? thread = null,
    AgentRunOptions? options = null, CancellationToken cancellationToken = default)
{
    using var activity = ActivitySource.StartActivity("TestAgent.Run");
    activity?.SetTag("agent.name", Name);
    activity?.SetTag("agent.id", Id);

    // Get Azure OpenAI configuration
    var endpoint = new Uri(configuration["Azure:Endpoint"]!);
    var apiKey = configuration["Azure:ApiKey"]!;
    var deploymentName = configuration["Azure:ModelId"] ?? "gpt-4.1";

    var userService = UserService.Create(httpContextAccessor.HttpContext);

    // Create Azure OpenAI client
    var client = new AzureOpenAIClient(endpoint, new AzureKeyCredential(apiKey));
    var chatClient = client.GetOpenAIResponseClient(deploymentName).AsIChatClient();

    var instructions = @"
        You are a helpful assistant. 
        Provide a brief, friendly response to the user's message.
        Keep responses concise (1-2 sentences).
    ";

    // Create ChatClientAgent
    var chatAgent = new ChatClientAgent(chatClient, instructions, "TestAgent");

    // Ensure options include usage information
    var runOptions = options ?? new AgentRunOptions();
    if (runOptions.AdditionalProperties == null || !runOptions.AdditionalProperties.ContainsKey("model_extras"))
    {
        runOptions.AdditionalProperties ??= new AdditionalPropertiesDictionary();
        runOptions.AdditionalProperties["model_extras"] = new { stream_options = new { include_usage = true } };
    }

    // Delegate to ChatClientAgent
    var result = await chatAgent.RunAsync(messages, null, options: runOptions, cancellationToken);

    // Extract the usage information from the result and include it in the result AdditionalProperties
    var usageJson = ExtractUsageFromResponse(result);
    if (!string.IsNullOrEmpty(usageJson))
    {
        result.AdditionalProperties ??= new AdditionalPropertiesDictionary();
        result.AdditionalProperties["usage"] = usageJson;

        if (result.Messages.Count > 0) {
            var lastMessage = result.Messages.Last();
            var content = lastMessage.Contents.LastOrDefault();
            if (content != null) {
                content.RawRepresentation = result.AdditionalProperties;
            }
        }
    }

    return result;
}