.NET: Add A2A input-request content for human-in-the-loop scenarios (#5743)

* .NET: Add A2A input-request content for human-in-the-loop scenarios

Adds first-class support for handling user input requests from A2A agents
when they return an `input-required` task state.

- Add `A2AInputRequestContent` (wraps the requested `AIContent`) and
  `A2AInputResponseContent` (wraps the user's `AIContent` reply), with
  `CreateResponse` helper overloads on the request type.
- Surface input requests on `AgentResponse` / `AgentResponseUpdate` via
  `AgentTask` and `TaskStatusUpdateEvent` mappings.
- Link follow-up messages containing `A2AInputResponseContent` to the
  existing task via `TaskId` instead of `ReferenceTaskIds`.
- Add `A2AAgent_HumanInTheLoop` sample and register it in the solution
  and parent README.
- Add unit tests for the new types, extensions, and `A2AAgent` paths.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove unnecessary using directive flagged by CI format check

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* address feedback

* Guard against null TaskId when sending A2AInputResponseContent

Throw InvalidOperationException if TaskId is missing when the message
contains A2AInputResponseContent, preventing silent no-op responses.
Also adds tests for both RunAsync and RunStreamingAsync paths.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Leave Contents null for non-InputRequired status updates

Remove unnecessary '?? []' fallback so Contents stays null when there
are no input requests, matching the other update mapping patterns.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Use consistent GUID format for request IDs

Use ToString("N") to match message ID format used elsewhere in
the A2A component.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Remove Debug build exclusion for the HumanInTheLoop sample so it                                                                                                                                                                                                               participates in normal solution validation.

* Add missing using Microsoft.Extensions.AI to A2AAgent_HumanInTheLoop

The sample uses ChatMessage, TextContent, and ChatRole types from
Microsoft.Extensions.AI but was missing the using directive, causing
CS0246 build errors on all CI jobs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* change the way user input requests are handled based on pr review comments

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

dotnet/agent-framework-dotnet.slnx

@@ -1,4 +1,4 @@
-<Solution>
+<Solution>
   <Configurations>
     <BuildType Name="Debug" />
     <BuildType Name="Publish" />

dotnet/src/Microsoft.Agents.AI.A2A/A2AAgent.cs

@@ -93,26 +93,26 @@ public sealed class A2AAgent : AIAgent
     /// <inheritdoc/>
     protected override async Task<AgentResponse> RunCoreAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default)
     {
-        _ = Throw.IfNull(messages);
+        var inputMessages = Throw.IfNull(messages) as IReadOnlyCollection<ChatMessage> ?? messages.ToList();
 
         A2AAgentSession typedSession = await this.GetA2ASessionAsync(session, options, cancellationToken).ConfigureAwait(false);
 
         this._logger.LogA2AAgentInvokingAgent(nameof(RunAsync), this.Id, this.Name);
 
-        if (GetContinuationToken(messages, options) is { } token)
+        if (GetContinuationToken(inputMessages, options) is { } token)
         {
             AgentTask agentTask = await this._a2aClient.GetTaskAsync(new GetTaskRequest { Id = token.TaskId }, cancellationToken).ConfigureAwait(false);
 
             this._logger.LogAgentChatClientInvokedAgent(nameof(RunAsync), this.Id, this.Name);
 
-            UpdateSession(typedSession, agentTask.ContextId, agentTask.Id);
+            UpdateSession(typedSession, agentTask.ContextId, agentTask.Id, agentTask.Status.State);
 
             return this.ConvertToAgentResponse(agentTask);
         }
 
         SendMessageRequest sendParams = new()
         {
-            Message = CreateA2AMessage(typedSession, messages),
+            Message = CreateA2AMessage(typedSession, inputMessages),
             Metadata = options?.AdditionalProperties?.ToA2AMetadata(),
             Configuration = new SendMessageConfiguration { ReturnImmediately = options?.AllowBackgroundResponses is true }
         };
@@ -134,7 +134,7 @@ public sealed class A2AAgent : AIAgent
         {
             var agentTask = a2aResponse.Task!;
 
-            UpdateSession(typedSession, agentTask.ContextId, agentTask.Id);
+            UpdateSession(typedSession, agentTask.ContextId, agentTask.Id, agentTask.Status.State);
 
             return this.ConvertToAgentResponse(agentTask);
         }
@@ -145,7 +145,7 @@ public sealed class A2AAgent : AIAgent
     /// <inheritdoc/>
     protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingAsync(IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, [EnumeratorCancellation] CancellationToken cancellationToken = default)
     {
-        _ = Throw.IfNull(messages);
+        var inputMessages = Throw.IfNull(messages) as IReadOnlyCollection<ChatMessage> ?? messages.ToList();
 
         A2AAgentSession typedSession = await this.GetA2ASessionAsync(session, options, cancellationToken).ConfigureAwait(false);
 
@@ -153,7 +153,7 @@ public sealed class A2AAgent : AIAgent
 
         ConfiguredCancelableAsyncEnumerable<StreamResponse> streamEvents;
 
-        if (GetContinuationToken(messages, options) is { } token)
+        if (GetContinuationToken(inputMessages, options) is { } token)
         {
             streamEvents = this.SubscribeToTaskWithFallbackAsync(token.TaskId, cancellationToken).ConfigureAwait(false);
         }
@@ -161,7 +161,7 @@ public sealed class A2AAgent : AIAgent
         {
             SendMessageRequest sendParams = new()
             {
-                Message = CreateA2AMessage(typedSession, messages),
+                Message = CreateA2AMessage(typedSession, inputMessages),
                 Metadata = options?.AdditionalProperties?.ToA2AMetadata()
             };
 
@@ -172,6 +172,7 @@ public sealed class A2AAgent : AIAgent
 
         string? contextId = null;
         string? taskId = null;
+        TaskState? taskState = null;
 
         await foreach (var streamResponse in streamEvents)
         {
@@ -187,6 +188,7 @@ public sealed class A2AAgent : AIAgent
                     var task = streamResponse.Task!;
                     contextId = task.ContextId;
                     taskId = task.Id;
+                    taskState = task.Status.State;
                     yield return this.ConvertToAgentResponseUpdate(task);
                     break;
 
@@ -194,6 +196,7 @@ public sealed class A2AAgent : AIAgent
                     var statusUpdate = streamResponse.StatusUpdate!;
                     contextId = statusUpdate.ContextId;
                     taskId = statusUpdate.TaskId;
+                    taskState = statusUpdate.Status.State;
                     yield return this.ConvertToAgentResponseUpdate(statusUpdate);
                     break;
 
@@ -209,7 +212,7 @@ public sealed class A2AAgent : AIAgent
             }
         }
 
-        UpdateSession(typedSession, contextId, taskId);
+        UpdateSession(typedSession, contextId, taskId, taskState);
     }
 
     /// <inheritdoc/>
@@ -317,7 +320,7 @@ public sealed class A2AAgent : AIAgent
         }
     }
 
-    private static void UpdateSession(A2AAgentSession? session, string? contextId, string? taskId = null)
+    private static void UpdateSession(A2AAgentSession? session, string? contextId, string? taskId = null, TaskState? taskState = null)
     {
         if (session is null)
         {
@@ -335,9 +338,10 @@ public sealed class A2AAgent : AIAgent
         // Assign a server-generated context Id to the session if it's not already set.
         session.ContextId ??= contextId;
         session.TaskId = taskId;
+        session.TaskState = taskState;
     }
 
-    private static Message CreateA2AMessage(A2AAgentSession typedSession, IEnumerable<ChatMessage> messages)
+    private static Message CreateA2AMessage(A2AAgentSession typedSession, IReadOnlyCollection<ChatMessage> messages)
     {
         var a2aMessage = messages.ToA2AMessage();
 
@@ -345,9 +349,19 @@ public sealed class A2AAgent : AIAgent
         // See: https://github.com/a2aproject/A2A/blob/main/docs/topics/life-of-a-task.md#group-related-interactions
         a2aMessage.ContextId = typedSession.ContextId;
 
-        // Link the message as a follow-up to an existing task, if any.
-        // See: https://github.com/a2aproject/A2A/blob/main/docs/topics/life-of-a-task.md#task-refinements
-        a2aMessage.ReferenceTaskIds = typedSession.TaskId is null ? null : [typedSession.TaskId];
+        if (typedSession.TaskState == TaskState.InputRequired)
+        {
+            // If the session indicates the task is waiting for user input,
+            // link the response to the existing task so it is treated as input
+            // for that task.
+            a2aMessage.TaskId = typedSession.TaskId;
+        }
+        else
+        {
+            // Link the message as a follow-up to an existing task, if any.
+            // See: https://github.com/a2aproject/A2A/blob/main/docs/topics/life-of-a-task.md#task-refinements
+            a2aMessage.ReferenceTaskIds = typedSession.TaskId is not null ? [typedSession.TaskId] : null;
+        }
 
         return a2aMessage;
     }
@@ -444,6 +458,7 @@ public sealed class A2AAgent : AIAgent
             Role = ChatRole.Assistant,
             FinishReason = MapTaskStateToFinishReason(statusUpdateEvent.Status.State),
             AdditionalProperties = statusUpdateEvent.Metadata?.ToAdditionalProperties() ?? [],
+            Contents = statusUpdateEvent.Status.GetUserInputRequests(),
         };
     }
 

dotnet/src/Microsoft.Agents.AI.A2A/A2AAgentSession.cs

@@ -5,6 +5,8 @@ using System.Diagnostics;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
+using TaskState = A2A.TaskState;
+
 namespace Microsoft.Agents.AI.A2A;
 
 /// <summary>
@@ -18,10 +20,11 @@ public sealed class A2AAgentSession : AgentSession
     }
 
     [JsonConstructor]
-    internal A2AAgentSession(string? contextId, string? taskId, AgentSessionStateBag? stateBag) : base(stateBag ?? new())
+    internal A2AAgentSession(string? contextId, string? taskId, TaskState? taskState, AgentSessionStateBag? stateBag) : base(stateBag ?? new())
     {
         this.ContextId = contextId;
         this.TaskId = taskId;
+        this.TaskState = taskState;
     }
 
     /// <summary>
@@ -36,6 +39,12 @@ public sealed class A2AAgentSession : AgentSession
     [JsonPropertyName("taskId")]
     public string? TaskId { get; internal set; }
 
+    /// <summary>
+    /// Gets the state of the task the agent is currently working on.
+    /// </summary>
+    [JsonPropertyName("taskState")]
+    public TaskState? TaskState { get; internal set; }
+
     /// <inheritdoc/>
     internal JsonElement Serialize(JsonSerializerOptions? jsonSerializerOptions = null)
     {
@@ -57,5 +66,5 @@ public sealed class A2AAgentSession : AgentSession
 
     [DebuggerBrowsable(DebuggerBrowsableState.Never)]
     private string DebuggerDisplay =>
-        $"ContextId = {this.ContextId}, TaskId = {this.TaskId}, StateBag Count = {this.StateBag.Count}";
+        $"ContextId = {this.ContextId}, TaskId = {this.TaskId}, TaskState = {this.TaskState}, StateBag Count = {this.StateBag.Count}";
 }

dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AAIContentExtensions.cs

@@ -13,7 +13,7 @@ internal static class A2AAIContentExtensions
     /// <summary>
     ///  Converts a collection of <see cref="AIContent"/> to a list of <see cref="Part"/> objects.
     /// </summary>
-    /// <param name="contents">The collection of AI contents to convert.</param>"
+    /// <param name="contents">The collection of AI contents to convert.</param>
     /// <returns>The list of A2A <see cref="Part"/> objects.</returns>
     internal static List<Part>? ToParts(this IEnumerable<AIContent> contents)
     {
@@ -21,8 +21,7 @@ internal static class A2AAIContentExtensions
 
         foreach (var content in contents)
         {
-            var part = content.ToPart();
-            if (part is not null)
+            if (content.ToPart() is { } part)
             {
                 (parts ??= []).Add(part);
             }

dotnet/src/Microsoft.Agents.AI.A2A/Extensions/A2AAgentTaskExtensions.cs

@@ -17,7 +17,7 @@ internal static class A2AAgentTaskExtensions
 
         List<ChatMessage>? messages = null;
 
-        if (agentTask?.Artifacts is { Count: > 0 })
+        if (agentTask.Artifacts is { Count: > 0 })
         {
             foreach (var artifact in agentTask.Artifacts)
             {
@@ -25,6 +25,14 @@ internal static class A2AAgentTaskExtensions
             }
         }
 
+        if (agentTask.Status?.GetUserInputRequests() is { } userInputRequests)
+        {
+            (messages ??= []).Add(new(ChatRole.Assistant, userInputRequests)
+            {
+                RawRepresentation = agentTask.Status,
+            });
+        }
+
         return messages;
     }
 
@@ -42,6 +50,11 @@ internal static class A2AAgentTaskExtensions
             }
         }
 
+        if (agentTask.Status?.GetUserInputRequests() is { } userInputRequests)
+        {
+            (aiContents ??= []).AddRange(userInputRequests);
+        }
+
         return aiContents;
     }
 }

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

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Collections.Generic;
+using Microsoft.Extensions.AI;
+using Microsoft.Shared.Diagnostics;
+
+namespace A2A;
+
+/// <summary>
+/// Extension methods for the <see cref="TaskStatus"/> class.
+/// </summary>
+internal static class AgentTaskStatusExtensions
+{
+    internal static IList<AIContent>? GetUserInputRequests(this TaskStatus status)
+    {
+        _ = Throw.IfNull(status);
+
+        List<AIContent>? contents = null;
+
+        if (status.Message is null || status.State is not TaskState.InputRequired)
+        {
+            return contents;
+        }
+
+        foreach (var part in status.Message.Parts)
+        {
+            var aiContent = part.ToAIContent();
+            aiContent.RawRepresentation = part;
+            aiContent.AdditionalProperties = part.Metadata.ToAdditionalProperties();
+            (contents ??= []).Add(aiContent);
+        }
+
+        return contents;
+    }
+}

dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/A2AAgentTests.cs

@@ -493,6 +493,35 @@ public sealed class A2AAgentTests : IDisposable
         Assert.Contains("task-123", message.ReferenceTaskIds);
     }
 
+    [Fact]
+    public async Task RunAsync_WithInputRequiredTaskState_SetsTaskIdOnMessageAsync()
+    {
+        // Arrange
+        this._handler.ResponseToReturn = new SendMessageResponse
+        {
+            Message = new Message
+            {
+                MessageId = "response-456",
+                Role = Role.Agent,
+                Parts = [new Part { Text = "Booking confirmed" }]
+            }
+        };
+
+        var session = (A2AAgentSession)await this._agent.CreateSessionAsync();
+        session.TaskId = "task-123";
+        session.TaskState = TaskState.InputRequired;
+
+        var inputMessage = new ChatMessage(ChatRole.User, [new TextContent("New York to London")]);
+
+        // Act
+        await this._agent.RunAsync(inputMessage, session);
+
+        // Assert
+        var message = this._handler.CapturedSendMessageRequest?.Message;
+        Assert.Equal("task-123", message?.TaskId);
+        Assert.Null(message?.ReferenceTaskIds);
+    }
+
     [Fact]
     public async Task RunAsync_WithAgentTask_UpdatesSessionTaskIdAsync()
     {
@@ -573,6 +602,7 @@ public sealed class A2AAgentTests : IDisposable
     [InlineData(TaskState.Completed)]
     [InlineData(TaskState.Failed)]
     [InlineData(TaskState.Canceled)]
+    [InlineData(TaskState.InputRequired)]
     public async Task RunAsync_WithVariousTaskStates_ReturnsCorrectTokenAsync(TaskState taskState)
     {
         // Arrange
@@ -842,6 +872,38 @@ public sealed class A2AAgentTests : IDisposable
         Assert.Contains("task-123", message.ReferenceTaskIds);
     }
 
+    [Fact]
+    public async Task RunStreamingAsync_WithInputRequiredTaskState_SetsTaskIdOnMessageAsync()
+    {
+        // Arrange
+        this._handler.StreamingResponseToReturn = new StreamResponse
+        {
+            Message = new Message
+            {
+                MessageId = "response-456",
+                Role = Role.Agent,
+                Parts = [new Part { Text = "Booking confirmed" }]
+            }
+        };
+
+        var session = (A2AAgentSession)await this._agent.CreateSessionAsync();
+        session.TaskId = "task-123";
+        session.TaskState = TaskState.InputRequired;
+
+        var inputMessage = new ChatMessage(ChatRole.User, [new TextContent("New York to London")]);
+
+        // Act
+        await foreach (var _ in this._agent.RunStreamingAsync([inputMessage], session))
+        {
+            // Just iterate through to trigger the logic
+        }
+
+        // Assert
+        var message = this._handler.CapturedSendMessageRequest?.Message;
+        Assert.Equal("task-123", message?.TaskId);
+        Assert.Null(message?.ReferenceTaskIds);
+    }
+
     [Fact]
     public async Task RunStreamingAsync_WithAgentTask_UpdatesSessionTaskIdAsync()
     {
@@ -1004,6 +1066,50 @@ public sealed class A2AAgentTests : IDisposable
         Assert.Equal(TaskId, a2aSession.TaskId);
     }
 
+    [Fact]
+    public async Task RunStreamingAsync_WithInputRequiredStatusUpdate_YieldsStatusContentsAsync()
+    {
+        // Arrange
+        const string TaskId = "task-input-123";
+        const string ContextId = "ctx-input-456";
+
+        this._handler.StreamingResponseToReturn = new StreamResponse
+        {
+            StatusUpdate = new TaskStatusUpdateEvent
+            {
+                TaskId = TaskId,
+                ContextId = ContextId,
+                Status = new()
+                {
+                    State = TaskState.InputRequired,
+                    Message = new Message
+                    {
+                        Parts = [Part.FromText("Where would you like to fly?")]
+                    }
+                }
+            }
+        };
+
+        var session = await this._agent.CreateSessionAsync();
+
+        // Act
+        var updates = new List<AgentResponseUpdate>();
+        await foreach (var update in this._agent.RunStreamingAsync("I'd like to book a flight.", session))
+        {
+            updates.Add(update);
+        }
+
+        // Assert
+        Assert.Single(updates);
+
+        var update0 = updates[0];
+        Assert.Equal(TaskId, update0.ResponseId);
+        Assert.Null(update0.FinishReason);
+
+        var textContent = Assert.Single(update0.Contents.OfType<TextContent>());
+        Assert.Equal("Where would you like to fly?", textContent.Text);
+    }
+
     [Fact]
     public async Task RunStreamingAsync_WithTaskArtifactUpdateEvent_YieldsResponseUpdateAsync()
     {

dotnet/tests/Microsoft.Agents.AI.A2A.UnitTests/Extensions/A2AAgentTaskExtensionsTests.cs

@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using A2A;
 using Microsoft.Extensions.AI;
 
@@ -166,4 +167,79 @@ public sealed class A2AAgentTaskExtensionsTests
         Assert.Equal("content2", result[1].ToString());
         Assert.Equal("content3", result[2].ToString());
     }
+
+    [Fact]
+    public void ToChatMessages_WithInputRequiredStatus_IncludesStatusContents()
+    {
+        // Arrange
+        var agentTask = new AgentTask
+        {
+            Id = "task1",
+            Artifacts = null,
+            Status = new TaskStatus
+            {
+                State = TaskState.InputRequired,
+                Message = new Message { Parts = [Part.FromText("What is your destination?")] },
+            },
+        };
+
+        // Act
+        IList<ChatMessage>? result = agentTask.ToChatMessages();
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Single(result);
+        Assert.Equal(ChatRole.Assistant, result[0].Role);
+        var textContent = Assert.Single(result[0].Contents.OfType<TextContent>());
+        Assert.Equal("What is your destination?", textContent.Text);
+    }
+
+    [Fact]
+    public void ToAIContents_WithInputRequiredStatus_IncludesStatusContents()
+    {
+        // Arrange
+        var agentTask = new AgentTask
+        {
+            Id = "task1",
+            Artifacts = null,
+            Status = new TaskStatus
+            {
+                State = TaskState.InputRequired,
+                Message = new Message { Parts = [Part.FromText("What is your destination?")] },
+            },
+        };
+
+        // Act
+        IList<AIContent>? result = agentTask.ToAIContents();
+
+        // Assert
+        Assert.NotNull(result);
+        var textContent = Assert.Single(result.OfType<TextContent>());
+        Assert.Equal("What is your destination?", textContent.Text);
+    }
+
+    [Fact]
+    public void ToChatMessages_WithArtifactsAndInputRequired_IncludesBoth()
+    {
+        // Arrange
+        var agentTask = new AgentTask
+        {
+            Id = "task1",
+            Artifacts = [new Artifact { Parts = [Part.FromText("partial result")] }],
+            Status = new TaskStatus
+            {
+                State = TaskState.InputRequired,
+                Message = new Message { Parts = [Part.FromText("Need more info")] },
+            },
+        };
+
+        // Act
+        IList<ChatMessage>? result = agentTask.ToChatMessages();
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(2, result.Count);
+        Assert.Equal("partial result", result[0].Text);
+        Assert.Single(result[1].Contents.OfType<TextContent>());
+    }
 }

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

@@ -0,0 +1,121 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using System.Collections.Generic;
+using A2A;
+using Microsoft.Extensions.AI;
+
+namespace Microsoft.Agents.AI.A2A.UnitTests;
+
+/// <summary>
+/// Unit tests for the <see cref="AgentTaskStatusExtensions"/> class.
+/// </summary>
+public sealed class AgentTaskStatusExtensionsTests
+{
+    [Fact]
+    public void GetUserInputRequests_WithNullMessage_ReturnsNull()
+    {
+        // Arrange
+        var status = new TaskStatus
+        {
+            State = TaskState.InputRequired,
+            Message = null,
+        };
+
+        // Act
+        IList<AIContent>? result = status.GetUserInputRequests();
+
+        // Assert
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void GetUserInputRequests_WithNotInputRequiredState_ReturnsNull()
+    {
+        // Arrange
+        var status = new TaskStatus
+        {
+            State = TaskState.Completed,
+            Message = new Message { Parts = [Part.FromText("Some text")] },
+        };
+
+        // Act
+        IList<AIContent>? result = status.GetUserInputRequests();
+
+        // Assert
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void GetUserInputRequests_WithInputRequiredStateAndMultipleRequests_ReturnsAIContentList()
+    {
+        // Arrange
+        var status = new TaskStatus
+        {
+            State = TaskState.InputRequired,
+            Message = new Message
+            {
+                Parts =
+                [
+                    Part.FromText("First request"),
+                    Part.FromText("Second request"),
+                    Part.FromText("Third request")
+                ],
+            },
+        };
+
+        // Act
+        IList<AIContent>? result = status.GetUserInputRequests();
+
+        // Assert
+        Assert.NotNull(result);
+        Assert.Equal(3, result.Count);
+        Assert.Equal("First request", Assert.IsType<TextContent>(result[0]).Text);
+        Assert.Equal("Second request", Assert.IsType<TextContent>(result[1]).Text);
+        Assert.Equal("Third request", Assert.IsType<TextContent>(result[2]).Text);
+    }
+
+    [Fact]
+    public void GetUserInputRequests_WithTextParts_SetsRawRepresentationAndAdditionalPropertiesCorrectly()
+    {
+        // Arrange
+        var textPart = Part.FromText("Input request");
+        textPart.Metadata = new Dictionary<string, System.Text.Json.JsonElement>
+        {
+            { "key1", System.Text.Json.JsonSerializer.SerializeToElement("value1") },
+            { "key2", System.Text.Json.JsonSerializer.SerializeToElement("value2") }
+        };
+        var status = new TaskStatus
+        {
+            State = TaskState.InputRequired,
+            Message = new Message { Parts = [textPart] },
+        };
+
+        // Act
+        IList<AIContent>? result = status.GetUserInputRequests();
+
+        // Assert
+        Assert.NotNull(result);
+        var content = Assert.IsType<TextContent>(result[0]);
+        Assert.Equal(textPart, content.RawRepresentation);
+        Assert.NotNull(content.AdditionalProperties);
+        Assert.True(content.AdditionalProperties.ContainsKey("key1"));
+        Assert.True(content.AdditionalProperties.ContainsKey("key2"));
+    }
+
+    [Fact]
+    public void GetUserInputRequests_WithEmptyMessageParts_ReturnsNull()
+    {
+        // Arrange
+        var status = new TaskStatus
+        {
+            State = TaskState.InputRequired,
+            Message = new Message { Parts = [] },
+        };
+
+        // Act
+        IList<AIContent>? result = status.GetUserInputRequests();
+
+        // Assert
+        Assert.Null(result);
+    }
+}