Add AssistantReasoningEvent and AssistantReasoningDeltaEvent support to GitHubCopilotAgent

dotnet/src/Microsoft.Agents.AI.GitHub.Copilot/GitHubCopilotAgent.cs

@@ -182,6 +182,14 @@ protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingA
                         channel.Writer.TryWrite(this.ConvertToAgentResponseUpdate(assistantMessage));
                         break;
 
+                    case AssistantReasoningDeltaEvent reasoningDeltaEvent:
+                        channel.Writer.TryWrite(this.ConvertToAgentResponseUpdate(reasoningDeltaEvent));
+                        break;
+
+                    case AssistantReasoningEvent reasoningEvent:
+                        channel.Writer.TryWrite(this.ConvertToAgentResponseUpdate(reasoningEvent));
+                        break;
+
                     case AssistantUsageEvent usageEvent:
                         channel.Writer.TryWrite(this.ConvertToAgentResponseUpdate(usageEvent));
                         break;
@@ -339,6 +347,34 @@ private AgentResponseUpdate ConvertToAgentResponseUpdate(AssistantUsageEvent usa
         };
     }
 
+    private AgentResponseUpdate ConvertToAgentResponseUpdate(AssistantReasoningDeltaEvent reasoningDeltaEvent)
+    {
+        TextReasoningContent reasoningContent = new(reasoningDeltaEvent.Data?.DeltaContent ?? string.Empty)
+        {
+            RawRepresentation = reasoningDeltaEvent
+        };
+
+        return new AgentResponseUpdate(ChatRole.Assistant, [reasoningContent])
+        {
+            AgentId = this.Id,
+            CreatedAt = reasoningDeltaEvent.Timestamp
+        };
+    }
+
+    private AgentResponseUpdate ConvertToAgentResponseUpdate(AssistantReasoningEvent reasoningEvent)
+    {
+        TextReasoningContent reasoningContent = new(reasoningEvent.Data?.Content ?? string.Empty)
+        {
+            RawRepresentation = reasoningEvent
+        };
+
+        return new AgentResponseUpdate(ChatRole.Assistant, [reasoningContent])
+        {
+            AgentId = this.Id,
+            CreatedAt = reasoningEvent.Timestamp
+        };
+    }
+
     private static AdditionalPropertiesDictionary<long>? GetAdditionalCounts(AssistantUsageEvent usageEvent)
     {
         if (usageEvent.Data is null)

dotnet/tests/Microsoft.Agents.AI.GitHub.Copilot.UnitTests/GitHubCopilotAgentReasoningTests.cs

@@ -0,0 +1,272 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System;
+using System.Reflection;
+using GitHub.Copilot.SDK;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.GitHub.Copilot.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="GitHubCopilotAgent"/> reasoning event handling.
+/// </summary>
+public sealed class GitHubCopilotAgentReasoningTests
+{
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate correctly handles AssistantReasoningDeltaEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithReasoningDeltaEvent_CreatesTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningDeltaEvent using reflection
+        AssistantReasoningDeltaEvent reasoningDeltaEvent = new()
+        {
+            Data = new AssistantReasoningDeltaData
+            {
+                ReasoningId = "reasoning-123",
+                DeltaContent = "Thinking step "
+            },
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningDeltaEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningDeltaEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(ChatRole.Assistant, result.Role);
+        Assert.NotEmpty(result.Contents);
+
+        AIContent content = result.Contents[0];
+        Assert.IsType<TextReasoningContent>(content);
+
+        TextReasoningContent reasoningContent = (TextReasoningContent)content;
+        Assert.Equal("Thinking step ", reasoningContent.Text);
+        Assert.Equal(reasoningDeltaEvent, reasoningContent.RawRepresentation);
+        Assert.Equal(agent.Id, result.AgentId);
+        Assert.Equal(reasoningDeltaEvent.Timestamp, result.CreatedAt);
+    }
+
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate correctly handles AssistantReasoningEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithReasoningEvent_CreatesTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningEvent using reflection
+        AssistantReasoningEvent reasoningEvent = new()
+        {
+            Data = new AssistantReasoningData
+            {
+                ReasoningId = "reasoning-456",
+                Content = "Complete reasoning content"
+            },
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(ChatRole.Assistant, result.Role);
+        Assert.NotEmpty(result.Contents);
+
+        AIContent content = result.Contents[0];
+        Assert.IsType<TextReasoningContent>(content);
+
+        TextReasoningContent reasoningContent = (TextReasoningContent)content;
+        Assert.Equal("Complete reasoning content", reasoningContent.Text);
+        Assert.Equal(reasoningEvent, reasoningContent.RawRepresentation);
+        Assert.Equal(agent.Id, result.AgentId);
+        Assert.Equal(reasoningEvent.Timestamp, result.CreatedAt);
+    }
+
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate handles null data in AssistantReasoningDeltaEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithNullDataInReasoningDeltaEvent_CreatesEmptyTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningDeltaEvent with null data
+        AssistantReasoningDeltaEvent reasoningDeltaEvent = new()
+        {
+            Data = null!,
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningDeltaEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningDeltaEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(ChatRole.Assistant, result.Role);
+        Assert.NotEmpty(result.Contents);
+
+        AIContent content = result.Contents[0];
+        Assert.IsType<TextReasoningContent>(content);
+
+        TextReasoningContent reasoningContent = (TextReasoningContent)content;
+        Assert.Equal(string.Empty, reasoningContent.Text);
+    }
+
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate handles null content in AssistantReasoningEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithNullDataInReasoningEvent_CreatesEmptyTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningEvent with null data
+        AssistantReasoningEvent reasoningEvent = new()
+        {
+            Data = null!,
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(ChatRole.Assistant, result.Role);
+        Assert.NotEmpty(result.Contents);
+
+        AIContent content = result.Contents[0];
+        Assert.IsType<TextReasoningContent>(content);
+
+        TextReasoningContent reasoningContent = (TextReasoningContent)content;
+        Assert.Equal(string.Empty, reasoningContent.Text);
+    }
+
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate handles null DeltaContent in AssistantReasoningDeltaEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithNullDeltaContent_CreatesEmptyTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningDeltaEvent with null DeltaContent
+        AssistantReasoningDeltaEvent reasoningDeltaEvent = new()
+        {
+            Data = new AssistantReasoningDeltaData
+            {
+                ReasoningId = "reasoning-789",
+                DeltaContent = null!
+            },
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningDeltaEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningDeltaEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        AIContent content = result.Contents[0];
+        TextReasoningContent reasoningContent = Assert.IsType<TextReasoningContent>(content);
+        Assert.Equal(string.Empty, reasoningContent.Text);
+    }
+
+    /// <summary>
+    /// Tests that ConvertToAgentResponseUpdate handles null Content in AssistantReasoningEvent.
+    /// </summary>
+    [Fact]
+    public void ConvertToAgentResponseUpdate_WithNullContent_CreatesEmptyTextReasoningContent()
+    {
+        // Arrange
+        CopilotClient copilotClient = new(new CopilotClientOptions { AutoStart = false });
+        GitHubCopilotAgent agent = new(copilotClient, sessionConfig: null, ownsClient: false);
+
+        // Create an AssistantReasoningEvent with null Content
+        AssistantReasoningEvent reasoningEvent = new()
+        {
+            Data = new AssistantReasoningData
+            {
+                ReasoningId = "reasoning-999",
+                Content = null!
+            },
+            Timestamp = DateTimeOffset.UtcNow
+        };
+
+        // Act - Use reflection to call the private method
+        MethodInfo? method = typeof(GitHubCopilotAgent).GetMethod(
+            "ConvertToAgentResponseUpdate",
+            BindingFlags.NonPublic | BindingFlags.Instance,
+            null,
+            [typeof(AssistantReasoningEvent)],
+            null);
+
+        Assert.NotNull(method);
+
+        AgentResponseUpdate? result = method.Invoke(agent, [reasoningEvent]) as AgentResponseUpdate;
+
+        // Assert
+        Assert.NotNull(result);
+        AIContent content = result.Contents[0];
+        TextReasoningContent reasoningContent = Assert.IsType<TextReasoningContent>(content);
+        Assert.Equal(string.Empty, reasoningContent.Text);
+    }
+}

python/packages/github_copilot/agent_framework_github_copilot/_agent.py

@@ -382,6 +382,22 @@ def event_handler(event: SessionEvent) -> None:
                         raw_representation=event,
                     )
                     queue.put_nowait(update)
+            elif event.type == SessionEventType.ASSISTANT_REASONING_DELTA:
+                if event.data.delta_content:
+                    update = AgentResponseUpdate(
+                        role=Role.ASSISTANT,
+                        contents=[Content.from_text_reasoning(event.data.delta_content)],
+                        raw_representation=event,
+                    )
+                    queue.put_nowait(update)
+            elif event.type == SessionEventType.ASSISTANT_REASONING:
+                if event.data.content:
+                    update = AgentResponseUpdate(
+                        role=Role.ASSISTANT,
+                        contents=[Content.from_text_reasoning(event.data.content)],
+                        raw_representation=event,
+                    )
+                    queue.put_nowait(update)
             elif event.type == SessionEventType.SESSION_IDLE:
                 queue.put_nowait(None)
             elif event.type == SessionEventType.SESSION_ERROR: