.NET: Change GetAIAgentAsync to be synchronous (#1846)

* Change GetAIAgentAsync to be synchronous

* Update dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AAgentCardExtensionsTests.cs

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

dotnet/samples/GettingStarted/A2A/A2AAgent_AsFunctionTools/Program.cs

@@ -23,7 +23,7 @@ A2ACardResolver agentCardResolver = new(new Uri(a2aAgentHost));
 AgentCard agentCard = await agentCardResolver.GetAgentCardAsync();
 
 // Create an instance of the AIAgent for an existing A2A agent specified by the agent card.
-AIAgent a2aAgent = await agentCard.GetAIAgentAsync();
+AIAgent a2aAgent = agentCard.GetAIAgent();
 
 // Create the main agent, and provide the a2a agent skills as a function tools.
 AIAgent agent = new AzureOpenAIClient(

dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AAgentCardExtensions.cs

@@ -2,7 +2,6 @@
 
 using System;
 using System.Net.Http;
-using System.Threading.Tasks;
 using Microsoft.Agents.AI;
 using Microsoft.Extensions.Logging;
 
@@ -28,7 +27,7 @@ public static class A2AAgentCardExtensions
     /// <param name="httpClient">The <see cref="HttpClient"/> to use for HTTP requests.</param>
     /// <param name="loggerFactory">The logger factory for enabling logging within the agent.</param>
     /// <returns>An <see cref="AIAgent"/> instance backed by the A2A agent.</returns>
-    public static async Task<AIAgent> GetAIAgentAsync(this AgentCard card, HttpClient? httpClient = null, ILoggerFactory? loggerFactory = null)
+    public static AIAgent GetAIAgent(this AgentCard card, HttpClient? httpClient = null, ILoggerFactory? loggerFactory = null)
     {
         // Create the A2A client using the agent URL from the card.
         var a2aClient = new A2AClient(new Uri(card.Url), httpClient);

dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2ACardResolverExtensions.cs

@@ -42,6 +42,6 @@ public static class A2ACardResolverExtensions
         // Obtain the agent card from the resolver.
         var agentCard = await resolver.GetAgentCardAsync(cancellationToken).ConfigureAwait(false);
 
-        return await agentCard.GetAIAgentAsync(httpClient, loggerFactory).ConfigureAwait(false);
+        return agentCard.GetAIAgent(httpClient, loggerFactory);
     }
 }

dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AAgentCardExtensionsTests.cs

@@ -31,10 +31,10 @@ public sealed class A2AAgentCardExtensionsTests
     }
 
     [Fact]
-    public async Task GetAIAgentAsync_ReturnsAIAgentAsync()
+    public void GetAIAgent_ReturnsAIAgent()
     {
         // Act
-        var agent = await this._agentCard.GetAIAgentAsync();
+        var agent = this._agentCard.GetAIAgent();
 
         // Assert
         Assert.NotNull(agent);
@@ -56,7 +56,7 @@ public sealed class A2AAgentCardExtensionsTests
             Parts = [new TextPart { Text = "Response" }],
         });
 
-        var agent = await this._agentCard.GetAIAgentAsync(httpClient);
+        var agent = this._agentCard.GetAIAgent(httpClient);
 
         // Act
         await agent.RunAsync("Test input");