.Net: ChatClientAgent (Non-Streaming initial impl)

[rogerbarreto]

Motivation

• Resolves ChatClientAgent initial implementation with Non-Streaming API #67

This pull request introduces a series of changes to enhance the functionality of the Agent abstraction and its implementations, particularly focusing on the ChatClientAgent. Key updates include extending the Agent API, implementing the ChatClientAgent class with metadata and logging capabilities, and adding unit tests to validate the new functionality.

Enhancements to Agent API:

• dotnet/src/Microsoft.Agents.Abstractions/Agent.cs: Updated the CreateThreadAsync method to accept an optional CancellationToken parameter for better cancellation support.

Implementation of ChatClientAgent:

• dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgent.cs: Added the ChatClientAgent class to implement the Agent abstraction. This class provides methods for running chat sessions, handling agent instructions, and integrating with a chat client.
• dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentMetadata.cs: Introduced the ChatClientAgentMetadata class to encapsulate agent-specific metadata such as ID, name, description, and instructions.
• dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentThread.cs: Added the ChatClientAgentThread class to manage chat messages and support message retrieval for threads.
• dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentRunOptions.cs: Created the ChatClientAgentRunOptions class to provide additional options for agent invocation, including ChatOptions.

Logging Enhancements:

• dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs: Added logging extensions for ChatClientAgent using LoggerMessageAttribute to optimize logging code and track agent invocations.

Unit Tests:

• dotnet/tests/Microsoft.Agents.UnitTests/ChatCompletion/ChatClientAgentTests.cs: Implemented unit tests for ChatClientAgent to verify its metadata, invocation, and response handling. Includes tests for synchronous and streaming operations.

Additional Updates:

• dotnet/src/Microsoft.Agents/AgentExtensions.cs: Added extension methods for Agent to retrieve names and display names, ensuring non-null values for telemetry purposes.
• dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj: Updated project properties to enable InjectSharedThrow.
• dotnet/src/Microsoft.Agents/AgentImplementation.cs: Removed the placeholder AgentImplementation class as it is no longer needed.
• dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/AgentTests.cs: Updated the MockAgent implementation to reflect changes in the CreateThreadAsync method signature.

[Copilot]

Pull Request Overview

This pull request introduces non‐streaming implementation enhancements for a ChatClientAgent along with several new supporting classes and unit tests to validate the new functionality. Key changes include extending the Agent API to accept a CancellationToken, adding new implementations such as ChatClientAgent, ChatClientAgentThread, and associated metadata and run options classes, and updating unit tests to cover invocation, thread message retrieval, and logging.

Reviewed Changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
dotnet/tests/Microsoft.Agents.UnitTests/UnitTest1.cs	Removed a placeholder test file.
dotnet/tests/Microsoft.Agents.UnitTests/ChatCompletion/ChatClientAgentThreadTests.cs	Added tests to verify ChatClientAgentThread implements IMessagesRetrievableThread and its message-retrieval functionality.
dotnet/tests/Microsoft.Agents.UnitTests/ChatCompletion/ChatClientAgentTests.cs	Added unit tests to validate ChatClientAgent definition, invocation, and streaming (skipped) functionality.
dotnet/tests/Microsoft.Agents.Abstractions.UnitTests/AgentTests.cs	Updated MockAgent to reflect the new CreateThreadAsync signature with CancellationToken.
dotnet/src/Microsoft.Agents/Microsoft.Agents.csproj	Updated project properties to enable InjectSharedThrow.
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentThread.cs	Implemented ChatClientAgentThread with async message retrieval and thread management.
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentRunOptions.cs	Introduced a run options class to include ChatOptions.
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentMetadata.cs	Added a metadata class to encapsulate agent-specific details.
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs	Added logging extensions for ChatClientAgent leveraging LoggerMessageAttribute.
dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgent.cs	Implemented ChatClientAgent with metadata, logging, and integration with a chat client.
dotnet/src/Microsoft.Agents/AgentExtensions.cs	Provided extension methods to ensure a non-null agent name for telemetry purposes.
dotnet/src/Microsoft.Agents.Abstractions/Agent.cs	Updated CreateThreadAsync signature to accept an optional CancellationToken.

Comments suppressed due to low confidence (2)

dotnet/src/Microsoft.Agents/ChatCompletion/ChatClientAgentLogMessages.cs:23

• Consider assigning unique EventIds for each LoggerMessage method to simplify log filtering and troubleshooting, even though disabling warnings is suppressing conflicts.

[LoggerMessage(EventId = 0, Level = LogLevel.Debug, Message = "[{MethodName}] Agent {AgentId}/{AgentName} Invoking service {ServiceType}.")]

dotnet/tests/Microsoft.Agents.UnitTests/ChatCompletion/ChatClientAgentTests.cs:102

• [nitpick] The assertion 'Assert.Single(result.Messages);' appears to be duplicated within the test. Removing redundant assertions can improve test clarity.

Assert.Single(result.Messages);