.Net ChatClientAgent Streaming API Impl.

[Roger Barreto (rogerbarreto)]

#Motivation

• Resolves ChatClientAgent Streaming API #68

[Copilot]

Pull Request Overview

This PR implements full streaming support for the ChatClientAgent and updates related configuration, extensions, logging, and tests.

• Adds streaming logic to ChatClientAgent.RunStreamingAsync with proper thread/message preparation and logging
• Introduces InstructionsRole in ChatClientAgentOptions and extends the agent API with RunStreamingAsync in extensions
• Renames and updates unit tests to cover the new streaming behavior

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
dotnet/tests/.../ChatClientAgentTests.cs	Renamed tests, removed outdated ones, added new streaming test
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentOptions.cs	Added InstructionsRole property
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs	Updated log messages to reference client type instead of service
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentExtensions.cs	Added RunStreamingAsync extension and renamed parameter for clarity
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgent.cs	Implemented streaming API, refactored thread/message preparation

Comments suppressed due to low confidence (4)

dotnet/tests/Microsoft.Agents.UnitTests/ChatCompletion/ChatClientAgentTests.cs:546

• Add a unit test to verify that supplying InstructionsRole via ChatClientAgentOptions correctly overrides the default ChatClientAgent.InstructionsRole value.

}

dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentExtensions.cs:49

• [nitpick] Add a <returns> XML comment to describe that this method yields an asynchronous stream of ChatResponseUpdate items.

public static IAsyncEnumerable<ChatResponseUpdate> RunStreamingAsync(

dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs:27

• [nitpick] Consider renaming this method to LogAgentChatClientInvokingClient to reflect that it logs invocation of the chat client, matching the {ClientType} token in the message template.

public static partial void LogAgentChatClientInvokingAgent(

dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs:24

• All logger messages currently share EventId = 0. Assign distinct event IDs to each log entry to make filtering and diagnostics easier.

EventId = 0,