From d8271eda33702805a521604616e17fcd69ec76e6 Mon Sep 17 00:00:00 2001
From: venti <1308199824@qq.com>
Date: Sat, 30 May 2026 15:23:17 +0800
Subject: [PATCH] add FunctionApprovalResponseItemParam to fix unrecognized
 type discriminator (fixes #6006)

---
 .../OpenAIHostingJsonUtilities.cs             |  1 +
 .../Converters/ItemParamConverter.cs          |  1 +
 .../Responses/Models/ItemParam.cs             | 27 +++++++++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/OpenAIHostingJsonUtilities.cs b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/OpenAIHostingJsonUtilities.cs
index f77143c583..c5da1ec296 100644
--- a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/OpenAIHostingJsonUtilities.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/OpenAIHostingJsonUtilities.cs
@@ -133,6 +133,7 @@ private static JsonSerializerOptions CreateDefaultOptions()
 [JsonSerializable(typeof(MCPListToolsItemParam))]
 [JsonSerializable(typeof(MCPApprovalRequestItemParam))]
 [JsonSerializable(typeof(MCPApprovalResponseItemParam))]
+[JsonSerializable(typeof(FunctionApprovalResponseItemParam))]
 [JsonSerializable(typeof(MCPCallItemParam))]
 [JsonSerializable(typeof(List<ItemParam>))]
 // ItemContent types
diff --git a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Converters/ItemParamConverter.cs b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Converters/ItemParamConverter.cs
index 9e63bcfd9d..94eff1e34d 100644
--- a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Converters/ItemParamConverter.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Converters/ItemParamConverter.cs
@@ -43,6 +43,7 @@ internal sealed class ItemParamConverter : JsonConverter<ItemParam>
             "mcp_list_tools" => doc.Deserialize(OpenAIHostingJsonContext.Default.MCPListToolsItemParam),
             "mcp_approval_request" => doc.Deserialize(OpenAIHostingJsonContext.Default.MCPApprovalRequestItemParam),
             "mcp_approval_response" => doc.Deserialize(OpenAIHostingJsonContext.Default.MCPApprovalResponseItemParam),
+            "function_approval_response" => doc.Deserialize(OpenAIHostingJsonContext.Default.FunctionApprovalResponseItemParam),
             "mcp_call" => doc.Deserialize(OpenAIHostingJsonContext.Default.MCPCallItemParam),
             _ => null // Ignore unknown types.
         };
diff --git a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Models/ItemParam.cs b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Models/ItemParam.cs
index df8a378df2..5f0d85b28c 100644
--- a/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Models/ItemParam.cs
+++ b/dotnet/src/Microsoft.Agents.AI.Hosting.OpenAI/Responses/Models/ItemParam.cs
@@ -532,6 +532,33 @@ internal sealed class MCPApprovalResponseItemParam : ItemParam
     public string? Reason { get; init; }
 }
 
+/// <summary>
+/// A function approval response item parameter.
+/// This is a non-standard DevUI extension for human-in-the-loop scenarios.
+/// </summary>
+internal sealed class FunctionApprovalResponseItemParam : ItemParam
+{
+    /// <summary>
+    /// The constant item type identifier for function approval response items.
+    /// </summary>
+    public const string ItemType = "function_approval_response";
+
+    /// <inheritdoc/>
+    public override string Type => ItemType;
+
+    /// <summary>
+    /// The unique identifier of the approval request being responded to.
+    /// </summary>
+    [JsonPropertyName("request_id")]
+    public required string RequestId { get; init; }
+
+    /// <summary>
+    /// Gets or sets a value indicating whether the function call was approved.
+    /// </summary>
+    [JsonPropertyName("approved")]
+    public bool Approved { get; init; }
+}
+
 /// <summary>
 /// An MCP call item parameter.
 /// </summary>