.NET: [Bug]: Agent framework (RC) is incompatible with hosted agents

[gmantri]

Description

We have a hosted agent running in Azure Foundry. Today, we upgraded the agent to the RC version. After the deployment, when we try to chat with the agent using the chat interface in Foundry portal, we are getting this error:

Error Could not load type 'Microsoft.Agents.AI.AgentRunResponseUpdate' from assembly 'Microsoft.Agents.AI.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f300afd708cefcd3'.

We have seen this error in previous versions as well. The only version which worked for us was Microsoft.Agents.AI version 1.0.0-preview.260108.1.

This is not the limitation in just the Chat UI. If we use Azure.AI.Projects SDK to chat with the agent, we are getting the same error.

Here are all the packages we are using:

    <PackageReference Include="Azure.AI.AgentServer.AgentFramework" Version="1.0.0-beta.8" />
    <PackageReference Include="Azure.AI.OpenAI" Version="2.8.0-beta.1" />
    <PackageReference Include="Azure.Identity" Version="1.18.0-beta.2" />
    <PackageReference Include="Microsoft.Agents.AI" Version="1.0.0-rc1" />
    <PackageReference Include="Microsoft.Agents.AI.DevUI" Version="1.0.0-preview.260219.1" />
    <PackageReference Include="Microsoft.Agents.AI.OpenAI" Version="1.0.0-rc1" />
    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="3.0.0" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.2" />
    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.2" />
    <!-- Use versions compatible with ApplicationInsights -->
    <PackageReference Include="OpenTelemetry" Version="1.15.0" />
    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.15.0" />
    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.0" />
    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.0" />
    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.0" />
    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.15.0" />
    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="10.0.3" />

Code Sample

var openAIClient = new AzureOpenAIClient(new Uri(endpoint), new DefaultAzureCredential());
#pragma warning disable OPENAI001 // Suppress warning for AsAIAgent usage
var responseClient = openAIClient.GetResponsesClient(deploymentName);
var agent = responseClient.AsAIAgent(
	instructions: "You are a helpful assistant that helps users with their queries.",
	name: "MyAwesomeAgent",
	description: "An AI agent that helps users with their queries."
);

await agent.RunAIAgentAsync(telemetrySourceName: "MyAwesomeAgent");

Error Messages / Stack Traces

Error Could not load type 'Microsoft.Agents.AI.AgentRunResponseUpdate' from assembly 'Microsoft.Agents.AI.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=f300afd708cefcd3'.

Package Versions

Microsoft.Agents.AI (1.0.0-rc1), Microsoft.Agents.AI.OpenAI (1.0.0-rc1)

.NET Version

.Net 8

Additional Context

As mentioned above, only SDK version that worked for us was 1.0.0-preview.260108.1. I noticed that this version was the last version that had AgentRunResponseUpdate class in there. After that it was removed.

[rogerbarreto]

The latest version of Azure.AI.AgentServer.AgentFramework package is still referencing an old Agent Framework preview package.

I put forward an update to our latest version and looking forward to get this update merged and released into the Hosted Agents SDK package.

• Update Microsoft.Agents.AI to 1.0.0-rc1 Azure/azure-sdk-for-net#56341

[gmantri]

@rogerbarreto - Thank you for your comment and raising the PR. If I understand correctly, once the PR is merged, it will resolve the issue in both Chat UI in Foundry Portal as well as when a hosted agent is invoked in the code. Correct?

[rogerbarreto]

issue in both Chat UI in Foundry Portal as well as when a hosted agent is invoked in the code. Correct?

If the you are having is related to this error AgentRunResponseUpdate, yes, our type name changed to AgentResponseUpdate (without run) in the latest versions.

@gmantri After the PR is merged we will need to wait for the code to be release in a new version of their package before it will be pointing to the latest Agent Framework version.

[rogerbarreto]

• Addressed in .NET: Update HostedAgents samples to Azure.AI.AgentServer.AgentFramework 1.0.0-beta.9 and MEAI 10.3.0 #4477