.NET: Enable function approval response content DevUI Extension

dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Converters/ItemContentConverter.cs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft. All rights reserved.
 
 using System;
+using System.Collections.Generic;
+using System.Text.Json;
 using Microsoft.Agents.AI.Hosting.OpenAI.Responses.Models;
 using Microsoft.Extensions.AI;
 
@@ -69,6 +71,13 @@ private static string MediaTypeToAudioFormat(string mediaType) =>
                 new DataContent(inputAudio.Data, AudioFormatToMediaType(inputAudio.Format)),
             ItemContentOutputAudio outputAudio =>
                 new DataContent(outputAudio.Data, "audio/*"),
+            ItemContentFunctionApprovalResponse functionApprovalResponse => new ToolApprovalResponseContent(
+                functionApprovalResponse.RequestId,
+                functionApprovalResponse.Approved,
+                new FunctionCallContent(
+                    functionApprovalResponse.FunctionCall.Id,
+                    functionApprovalResponse.FunctionCall.Name,
+                    ParseArguments(functionApprovalResponse.FunctionCall.Arguments))),
 
             _ => null
         };
@@ -159,4 +168,36 @@ DataContent audioData when audioData.HasTopLevelMediaType("audio") =>
 
         return null;
     }
+
+    private static Dictionary<string, object?>? ParseArguments(JsonElement argumentsJson)
+    {
+        if (argumentsJson.ValueKind is not JsonValueKind.Object)
+        {
+            return null;
+        }
+
+        try
+        {
+            using var doc = JsonDocument.Parse(argumentsJson.GetRawText());
+            var result = new Dictionary<string, object?>();
+            foreach (var property in doc.RootElement.EnumerateObject())
+            {
+                result[property.Name] = property.Value.ValueKind switch
+                {
+                    JsonValueKind.String => property.Value.GetString(),
+                    JsonValueKind.Number => property.Value.GetDouble(),
+                    JsonValueKind.True => true,
+                    JsonValueKind.False => false,
+                    JsonValueKind.Null => null,
+                    _ => property.Value.GetRawText()
+                };
+            }
+
+            return result;
+        }
+        catch (JsonException)
+        {
+            return null;
+        }
+    }
 }

dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Models/ItemResource.cs

@@ -266,6 +266,7 @@ internal enum FunctionToolCallOutputItemResourceStatus
 [JsonDerivedType(typeof(ItemContentOutputText), "output_text")]
 [JsonDerivedType(typeof(ItemContentOutputAudio), "output_audio")]
 [JsonDerivedType(typeof(ItemContentRefusal), "refusal")]
+[JsonDerivedType(typeof(ItemContentFunctionApprovalResponse), "function_approval_response")]
 internal abstract class ItemContent
 {
     /// <summary>
@@ -443,6 +444,58 @@ internal sealed class ItemContentRefusal : ItemContent
     public required string Refusal { get; init; }
 }
 
+/// <summary>
+/// Represents function call information for approval response item.
+/// </summary>
+internal sealed class FunctionCall
+{
+    /// <summary>
+    /// Gets or initializes the function call ID.
+    /// </summary>
+    [JsonPropertyName("id")]
+    public required string Id { get; init; }
+
+    /// <summary>
+    /// Gets or initializes the function name.
+    /// </summary>
+    [JsonPropertyName("name")]
+    public required string Name { get; init; }
+
+    /// <summary>
+    /// Gets or initializes the function arguments.
+    /// </summary>
+    [JsonPropertyName("arguments")]
+    public required JsonElement Arguments { get; init; }
+}
+
+/// <summary>
+/// Function approval response content.
+/// </summary>
+internal sealed class ItemContentFunctionApprovalResponse : ItemContent
+{
+    /// <inheritdoc/>
+    [JsonIgnore]
+    public override string Type => "function_approval_response";
+
+    /// <summary>
+    /// Gets or initializes the value indicating whether the function call was approved for execution.
+    /// </summary>
+    [JsonPropertyName("approved")]
+    public required bool Approved { get; init; }
+
+    /// <summary>
+    /// Gets or initializes the function call that was subject to approval.
+    /// </summary>
+    [JsonPropertyName("function_call")]
+    public required FunctionCall FunctionCall { get; init; }
+
+    /// <summary>
+    /// Gets or initializes the unique identifier that correlates this response with its corresponding request.
+    /// </summary>
+    [JsonPropertyName("request_id")]
+    public required string RequestId { get; init; }
+}
+
 // Additional ItemResource types from TypeSpec
 
 /// <summary>