diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/AIProjectsModelFactory.cs b/sdk/ai/Azure.AI.Projects/src/Generated/AIProjectsModelFactory.cs
index ed336da925ed..694ce19476f3 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/AIProjectsModelFactory.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/AIProjectsModelFactory.cs
@@ -325,7 +325,7 @@ public static RunStepMessageCreationReference RunStepMessageCreationReference(st
         /// <param name="toolCalls">
         /// A list of tool call details for this run step.
         /// Please note <see cref="Projects.RunStepToolCall"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="Projects.RunStepAzureAISearchToolCall"/>, <see cref="Projects.RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="Projects.RunStepMicrosoftFabricToolCall"/>, <see cref="Projects.RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/> and <see cref="Projects.RunStepSharepointToolCall"/>.
+        /// The available derived classes include <see cref="Projects.RunStepAzureAISearchToolCall"/>, <see cref="Projects.RunStepCustomSearchToolCall"/>, <see cref="Projects.RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="Projects.RunStepMicrosoftFabricToolCall"/>, <see cref="Projects.RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/>, <see cref="Projects.RunStepOpenAPIToolCall"/> and <see cref="Projects.RunStepSharepointToolCall"/>.
         /// </param>
         /// <returns> A new <see cref="Projects.RunStepToolCallDetails"/> instance for mocking. </returns>
         public static RunStepToolCallDetails RunStepToolCallDetails(IEnumerable<RunStepToolCall> toolCalls = null)
@@ -454,6 +454,28 @@ public static RunStepMicrosoftFabricToolCall RunStepMicrosoftFabricToolCall(stri
             return new RunStepMicrosoftFabricToolCall("fabric_dataagent", id, serializedAdditionalRawData: null, microsoftFabric);
         }
 
+        /// <summary> Initializes a new instance of <see cref="Projects.RunStepCustomSearchToolCall"/>. </summary>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="bingCustomSearch"> Reserved for future use. </param>
+        /// <returns> A new <see cref="Projects.RunStepCustomSearchToolCall"/> instance for mocking. </returns>
+        public static RunStepCustomSearchToolCall RunStepCustomSearchToolCall(string id = null, IReadOnlyDictionary<string, string> bingCustomSearch = null)
+        {
+            bingCustomSearch ??= new Dictionary<string, string>();
+
+            return new RunStepCustomSearchToolCall("bing_custom_search", id, serializedAdditionalRawData: null, bingCustomSearch);
+        }
+
+        /// <summary> Initializes a new instance of <see cref="Projects.RunStepOpenAPIToolCall"/>. </summary>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="openAPI"> Reserved for future use. </param>
+        /// <returns> A new <see cref="Projects.RunStepOpenAPIToolCall"/> instance for mocking. </returns>
+        public static RunStepOpenAPIToolCall RunStepOpenAPIToolCall(string id = null, IReadOnlyDictionary<string, string> openAPI = null)
+        {
+            openAPI ??= new Dictionary<string, string>();
+
+            return new RunStepOpenAPIToolCall("openapi", id, serializedAdditionalRawData: null, openAPI);
+        }
+
         /// <summary> Initializes a new instance of <see cref="Projects.RunStepError"/>. </summary>
         /// <param name="code"> The error code for this error. </param>
         /// <param name="message"> The human-readable text associated with this error. </param>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/AOAIModelConfig.cs b/sdk/ai/Azure.AI.Projects/src/Generated/AOAIModelConfig.cs
index b226cfb94368..1983a0c90b7b 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/AOAIModelConfig.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/AOAIModelConfig.cs
@@ -14,7 +14,7 @@ namespace Azure.AI.Projects
     public partial class AOAIModelConfig : TargetModelConfig
     {
         /// <summary> Initializes a new instance of <see cref="AOAIModelConfig"/>. </summary>
-        /// <param name="azureEndpoint"> Endpoint URL for AOAI model. </param>
+        /// <param name="azureEndpoint"> Endpoint targetURI for AOAI model. </param>
         /// <param name="apiKey"> API Key for AOAI model. </param>
         /// <param name="azureDeployment"> Deployment name for AOAI model. </param>
         /// <exception cref="ArgumentNullException"> <paramref name="azureEndpoint"/>, <paramref name="apiKey"/> or <paramref name="azureDeployment"/> is null. </exception>
@@ -33,7 +33,7 @@ public AOAIModelConfig(string azureEndpoint, string apiKey, string azureDeployme
         /// <summary> Initializes a new instance of <see cref="AOAIModelConfig"/>. </summary>
         /// <param name="type"> Type of the model configuration. </param>
         /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
-        /// <param name="azureEndpoint"> Endpoint URL for AOAI model. </param>
+        /// <param name="azureEndpoint"> Endpoint targetURI for AOAI model. </param>
         /// <param name="apiKey"> API Key for AOAI model. </param>
         /// <param name="azureDeployment"> Deployment name for AOAI model. </param>
         internal AOAIModelConfig(string type, IDictionary<string, BinaryData> serializedAdditionalRawData, string azureEndpoint, string apiKey, string azureDeployment) : base(type, serializedAdditionalRawData)
@@ -48,7 +48,7 @@ internal AOAIModelConfig()
         {
         }
 
-        /// <summary> Endpoint URL for AOAI model. </summary>
+        /// <summary> Endpoint targetURI for AOAI model. </summary>
         public string AzureEndpoint { get; set; }
         /// <summary> API Key for AOAI model. </summary>
         public string ApiKey { get; set; }
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/Agent.cs b/sdk/ai/Azure.AI.Projects/src/Generated/Agent.cs
index 8d1ff839899f..a6f1538ccb10 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/Agent.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/Agent.cs
@@ -56,7 +56,7 @@ public partial class Agent
         /// <param name="tools">
         /// The collection of tools enabled for the agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="toolResources">
         /// A set of resources that are used by the agent's tools. The resources are specific to the type of tool. For example, the `code_interpreter`
@@ -104,7 +104,7 @@ internal Agent(string id, DateTimeOffset createdAt, string name, string descript
         /// <param name="tools">
         /// The collection of tools enabled for the agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="toolResources">
         /// A set of resources that are used by the agent's tools. The resources are specific to the type of tool. For example, the `code_interpreter`
@@ -162,7 +162,7 @@ internal Agent()
         /// <summary>
         /// The collection of tools enabled for the agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> Tools { get; }
         /// <summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/AgentsNamedToolChoiceType.cs b/sdk/ai/Azure.AI.Projects/src/Generated/AgentsNamedToolChoiceType.cs
index 8a5bfe61444d..265d120d70fc 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/AgentsNamedToolChoiceType.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/AgentsNamedToolChoiceType.cs
@@ -29,6 +29,7 @@ public AgentsNamedToolChoiceType(string value)
         private const string MicrosoftFabricValue = "fabric_dataagent";
         private const string SharepointValue = "sharepoint_grounding";
         private const string AzureAISearchValue = "azure_ai_search";
+        private const string BingCustomSearchValue = "bing_custom_search";
 
         /// <summary> Tool type `function`. </summary>
         public static AgentsNamedToolChoiceType Function { get; } = new AgentsNamedToolChoiceType(FunctionValue);
@@ -44,6 +45,8 @@ public AgentsNamedToolChoiceType(string value)
         public static AgentsNamedToolChoiceType Sharepoint { get; } = new AgentsNamedToolChoiceType(SharepointValue);
         /// <summary> Tool type `azure_ai_search`. </summary>
         public static AgentsNamedToolChoiceType AzureAISearch { get; } = new AgentsNamedToolChoiceType(AzureAISearchValue);
+        /// <summary> Tool type `bing_custom_search`. </summary>
+        public static AgentsNamedToolChoiceType BingCustomSearch { get; } = new AgentsNamedToolChoiceType(BingCustomSearchValue);
         /// <summary> Determines if two <see cref="AgentsNamedToolChoiceType"/> values are the same. </summary>
         public static bool operator ==(AgentsNamedToolChoiceType left, AgentsNamedToolChoiceType right) => left.Equals(right);
         /// <summary> Determines if two <see cref="AgentsNamedToolChoiceType"/> values are not the same. </summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.Serialization.cs
new file mode 100644
index 000000000000..fd4c1472bb76
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.Serialization.cs
@@ -0,0 +1,134 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Collections.Generic;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.AI.Projects
+{
+    public partial class BingCustomSearchToolDefinition : IUtf8JsonSerializable, IJsonModel<BingCustomSearchToolDefinition>
+    {
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer) => ((IJsonModel<BingCustomSearchToolDefinition>)this).Write(writer, ModelSerializationExtensions.WireOptions);
+
+        void IJsonModel<BingCustomSearchToolDefinition>.Write(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            writer.WriteStartObject();
+            JsonModelWriteCore(writer, options);
+            writer.WriteEndObject();
+        }
+
+        /// <param name="writer"> The JSON writer. </param>
+        /// <param name="options"> The client options for reading and writing models. </param>
+        protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<BingCustomSearchToolDefinition>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(BingCustomSearchToolDefinition)} does not support writing '{format}' format.");
+            }
+
+            base.JsonModelWriteCore(writer, options);
+            writer.WritePropertyName("bing_custom_search"u8);
+            writer.WriteObjectValue(BingCustomSearch, options);
+        }
+
+        BingCustomSearchToolDefinition IJsonModel<BingCustomSearchToolDefinition>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<BingCustomSearchToolDefinition>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(BingCustomSearchToolDefinition)} does not support reading '{format}' format.");
+            }
+
+            using JsonDocument document = JsonDocument.ParseValue(ref reader);
+            return DeserializeBingCustomSearchToolDefinition(document.RootElement, options);
+        }
+
+        internal static BingCustomSearchToolDefinition DeserializeBingCustomSearchToolDefinition(JsonElement element, ModelReaderWriterOptions options = null)
+        {
+            options ??= ModelSerializationExtensions.WireOptions;
+
+            if (element.ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            SearchConfigurationList bingCustomSearch = default;
+            string type = default;
+            IDictionary<string, BinaryData> serializedAdditionalRawData = default;
+            Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("bing_custom_search"u8))
+                {
+                    bingCustomSearch = SearchConfigurationList.DeserializeSearchConfigurationList(property.Value, options);
+                    continue;
+                }
+                if (property.NameEquals("type"u8))
+                {
+                    type = property.Value.GetString();
+                    continue;
+                }
+                if (options.Format != "W")
+                {
+                    rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
+                }
+            }
+            serializedAdditionalRawData = rawDataDictionary;
+            return new BingCustomSearchToolDefinition(type, serializedAdditionalRawData, bingCustomSearch);
+        }
+
+        BinaryData IPersistableModel<BingCustomSearchToolDefinition>.Write(ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<BingCustomSearchToolDefinition>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    return ModelReaderWriter.Write(this, options);
+                default:
+                    throw new FormatException($"The model {nameof(BingCustomSearchToolDefinition)} does not support writing '{options.Format}' format.");
+            }
+        }
+
+        BingCustomSearchToolDefinition IPersistableModel<BingCustomSearchToolDefinition>.Create(BinaryData data, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<BingCustomSearchToolDefinition>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    {
+                        using JsonDocument document = JsonDocument.Parse(data, ModelSerializationExtensions.JsonDocumentOptions);
+                        return DeserializeBingCustomSearchToolDefinition(document.RootElement, options);
+                    }
+                default:
+                    throw new FormatException($"The model {nameof(BingCustomSearchToolDefinition)} does not support reading '{options.Format}' format.");
+            }
+        }
+
+        string IPersistableModel<BingCustomSearchToolDefinition>.GetFormatFromOptions(ModelReaderWriterOptions options) => "J";
+
+        /// <summary> Deserializes the model from a raw response. </summary>
+        /// <param name="response"> The response to deserialize the model from. </param>
+        internal static new BingCustomSearchToolDefinition FromResponse(Response response)
+        {
+            using var document = JsonDocument.Parse(response.Content, ModelSerializationExtensions.JsonDocumentOptions);
+            return DeserializeBingCustomSearchToolDefinition(document.RootElement);
+        }
+
+        /// <summary> Convert into a <see cref="RequestContent"/>. </summary>
+        internal override RequestContent ToRequestContent()
+        {
+            var content = new Utf8JsonRequestContent();
+            content.JsonWriter.WriteObjectValue(this, ModelSerializationExtensions.WireOptions);
+            return content;
+        }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.cs b/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.cs
new file mode 100644
index 000000000000..4e6749dbfe5b
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/BingCustomSearchToolDefinition.cs
@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+
+namespace Azure.AI.Projects
+{
+    /// <summary> The input definition information for a Bing custom search tool as used to configure an agent. </summary>
+    public partial class BingCustomSearchToolDefinition : ToolDefinition
+    {
+        /// <summary> Initializes a new instance of <see cref="BingCustomSearchToolDefinition"/>. </summary>
+        /// <param name="bingCustomSearch"> The list of search configurations used by the bing custom search tool. </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="bingCustomSearch"/> is null. </exception>
+        public BingCustomSearchToolDefinition(SearchConfigurationList bingCustomSearch)
+        {
+            Argument.AssertNotNull(bingCustomSearch, nameof(bingCustomSearch));
+
+            Type = "bing_custom_search";
+            BingCustomSearch = bingCustomSearch;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="BingCustomSearchToolDefinition"/>. </summary>
+        /// <param name="type"> The object type. </param>
+        /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
+        /// <param name="bingCustomSearch"> The list of search configurations used by the bing custom search tool. </param>
+        internal BingCustomSearchToolDefinition(string type, IDictionary<string, BinaryData> serializedAdditionalRawData, SearchConfigurationList bingCustomSearch) : base(type, serializedAdditionalRawData)
+        {
+            BingCustomSearch = bingCustomSearch;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="BingCustomSearchToolDefinition"/> for deserialization. </summary>
+        internal BingCustomSearchToolDefinition()
+        {
+        }
+
+        /// <summary> The list of search configurations used by the bing custom search tool. </summary>
+        public SearchConfigurationList BingCustomSearch { get; set; }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/CreateAgentRequest.cs b/sdk/ai/Azure.AI.Projects/src/Generated/CreateAgentRequest.cs
index 9dda204238ad..bb43c6e09183 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/CreateAgentRequest.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/CreateAgentRequest.cs
@@ -65,7 +65,7 @@ internal CreateAgentRequest(string model)
         /// <param name="tools">
         /// The collection of tools to enable for the new agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="toolResources">
         /// A set of resources that are used by the agent's tools. The resources are specific to the type of tool. For example, the `code_interpreter`
@@ -115,7 +115,7 @@ internal CreateAgentRequest()
         /// <summary>
         /// The collection of tools to enable for the new agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> Tools { get; }
         /// <summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/CreateRunRequest.cs b/sdk/ai/Azure.AI.Projects/src/Generated/CreateRunRequest.cs
index 9b9969dd27eb..b32ae5c3f845 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/CreateRunRequest.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/CreateRunRequest.cs
@@ -70,7 +70,7 @@ internal CreateRunRequest(string assistantId)
         /// <param name="overrideTools">
         /// The overridden list of enabled tools that the agent should use to run the thread.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="stream">
         /// If `true`, returns a stream of events that happen during the Run as server-sent events,
@@ -145,7 +145,7 @@ internal CreateRunRequest()
         /// <summary>
         /// The overridden list of enabled tools that the agent should use to run the thread.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> OverrideTools { get; }
         /// <summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/CreateThreadAndRunRequest.cs b/sdk/ai/Azure.AI.Projects/src/Generated/CreateThreadAndRunRequest.cs
index 58bc40b50d21..5cc281b7b2a4 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/CreateThreadAndRunRequest.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/CreateThreadAndRunRequest.cs
@@ -65,7 +65,7 @@ internal CreateThreadAndRunRequest(string assistantId)
         /// <param name="overrideTools">
         /// The overridden list of enabled tools the agent should use to run the thread.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="toolResources"> Override the tools the agent can use for this run. This is useful for modifying the behavior on a per-run basis. </param>
         /// <param name="stream">
@@ -136,7 +136,7 @@ internal CreateThreadAndRunRequest()
         /// <summary>
         /// The overridden list of enabled tools the agent should use to run the thread.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> OverrideTools { get; }
         /// <summary> Override the tools the agent can use for this run. This is useful for modifying the behavior on a per-run basis. </summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/MAASModelConfig.cs b/sdk/ai/Azure.AI.Projects/src/Generated/MAASModelConfig.cs
index 024f0dd9bb72..92712dbc0601 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/MAASModelConfig.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/MAASModelConfig.cs
@@ -14,7 +14,7 @@ namespace Azure.AI.Projects
     public partial class MAASModelConfig : TargetModelConfig
     {
         /// <summary> Initializes a new instance of <see cref="MAASModelConfig"/>. </summary>
-        /// <param name="azureEndpoint"> Endpoint URL for MAAS model. </param>
+        /// <param name="azureEndpoint"> Endpoint targetURI for MAAS model. </param>
         /// <param name="apiKey"> API Key for MAAS model. </param>
         /// <exception cref="ArgumentNullException"> <paramref name="azureEndpoint"/> or <paramref name="apiKey"/> is null. </exception>
         public MAASModelConfig(string azureEndpoint, string apiKey)
@@ -30,7 +30,7 @@ public MAASModelConfig(string azureEndpoint, string apiKey)
         /// <summary> Initializes a new instance of <see cref="MAASModelConfig"/>. </summary>
         /// <param name="type"> Type of the model configuration. </param>
         /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
-        /// <param name="azureEndpoint"> Endpoint URL for MAAS model. </param>
+        /// <param name="azureEndpoint"> Endpoint targetURI for MAAS model. </param>
         /// <param name="apiKey"> API Key for MAAS model. </param>
         internal MAASModelConfig(string type, IDictionary<string, BinaryData> serializedAdditionalRawData, string azureEndpoint, string apiKey) : base(type, serializedAdditionalRawData)
         {
@@ -43,7 +43,7 @@ internal MAASModelConfig()
         {
         }
 
-        /// <summary> Endpoint URL for MAAS model. </summary>
+        /// <summary> Endpoint targetURI for MAAS model. </summary>
         public string AzureEndpoint { get; set; }
         /// <summary> API Key for MAAS model. </summary>
         public string ApiKey { get; set; }
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.Serialization.cs
index 6cb17dad942d..28d64aeadd41 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.Serialization.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.Serialization.cs
@@ -52,6 +52,16 @@ protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWrit
 #endif
             writer.WritePropertyName("auth"u8);
             writer.WriteObjectValue(Auth, options);
+            if (Optional.IsCollectionDefined(DefaultParams))
+            {
+                writer.WritePropertyName("default_params"u8);
+                writer.WriteStartArray();
+                foreach (var item in DefaultParams)
+                {
+                    writer.WriteStringValue(item);
+                }
+                writer.WriteEndArray();
+            }
             if (options.Format != "W" && _serializedAdditionalRawData != null)
             {
                 foreach (var item in _serializedAdditionalRawData)
@@ -93,6 +103,7 @@ internal static OpenApiFunctionDefinition DeserializeOpenApiFunctionDefinition(J
             string description = default;
             BinaryData spec = default;
             OpenApiAuthDetails auth = default;
+            IList<string> defaultParams = default;
             IDictionary<string, BinaryData> serializedAdditionalRawData = default;
             Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
             foreach (var property in element.EnumerateObject())
@@ -117,13 +128,33 @@ internal static OpenApiFunctionDefinition DeserializeOpenApiFunctionDefinition(J
                     auth = OpenApiAuthDetails.DeserializeOpenApiAuthDetails(property.Value, options);
                     continue;
                 }
+                if (property.NameEquals("default_params"u8))
+                {
+                    if (property.Value.ValueKind == JsonValueKind.Null)
+                    {
+                        continue;
+                    }
+                    List<string> array = new List<string>();
+                    foreach (var item in property.Value.EnumerateArray())
+                    {
+                        array.Add(item.GetString());
+                    }
+                    defaultParams = array;
+                    continue;
+                }
                 if (options.Format != "W")
                 {
                     rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
                 }
             }
             serializedAdditionalRawData = rawDataDictionary;
-            return new OpenApiFunctionDefinition(name, description, spec, auth, serializedAdditionalRawData);
+            return new OpenApiFunctionDefinition(
+                name,
+                description,
+                spec,
+                auth,
+                defaultParams ?? new ChangeTrackingList<string>(),
+                serializedAdditionalRawData);
         }
 
         BinaryData IPersistableModel<OpenApiFunctionDefinition>.Write(ModelReaderWriterOptions options)
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.cs b/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.cs
index 8980b1cfe70e..b6ace6e72956 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/OpenApiFunctionDefinition.cs
@@ -63,6 +63,7 @@ public OpenApiFunctionDefinition(string name, BinaryData spec, OpenApiAuthDetail
             Name = name;
             Spec = spec;
             Auth = auth;
+            DefaultParams = new ChangeTrackingList<string>();
         }
 
         /// <summary> Initializes a new instance of <see cref="OpenApiFunctionDefinition"/>. </summary>
@@ -74,13 +75,15 @@ public OpenApiFunctionDefinition(string name, BinaryData spec, OpenApiAuthDetail
         /// Please note <see cref="OpenApiAuthDetails"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
         /// The available derived classes include <see cref="OpenApiAnonymousAuthDetails"/>, <see cref="OpenApiConnectionAuthDetails"/> and <see cref="OpenApiManagedAuthDetails"/>.
         /// </param>
+        /// <param name="defaultParams"> List of OpenAPI spec parameters that will use user-provided defaults. </param>
         /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
-        internal OpenApiFunctionDefinition(string name, string description, BinaryData spec, OpenApiAuthDetails auth, IDictionary<string, BinaryData> serializedAdditionalRawData)
+        internal OpenApiFunctionDefinition(string name, string description, BinaryData spec, OpenApiAuthDetails auth, IList<string> defaultParams, IDictionary<string, BinaryData> serializedAdditionalRawData)
         {
             Name = name;
             Description = description;
             Spec = spec;
             Auth = auth;
+            DefaultParams = defaultParams;
             _serializedAdditionalRawData = serializedAdditionalRawData;
         }
 
@@ -130,5 +133,7 @@ internal OpenApiFunctionDefinition()
         /// The available derived classes include <see cref="OpenApiAnonymousAuthDetails"/>, <see cref="OpenApiConnectionAuthDetails"/> and <see cref="OpenApiManagedAuthDetails"/>.
         /// </summary>
         public OpenApiAuthDetails Auth { get; set; }
+        /// <summary> List of OpenAPI spec parameters that will use user-provided defaults. </summary>
+        public IList<string> DefaultParams { get; }
     }
 }
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.Serialization.cs
new file mode 100644
index 000000000000..196457e0a2ca
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.Serialization.cs
@@ -0,0 +1,151 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Collections.Generic;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.AI.Projects
+{
+    public partial class RunStepCustomSearchToolCall : IUtf8JsonSerializable, IJsonModel<RunStepCustomSearchToolCall>
+    {
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer) => ((IJsonModel<RunStepCustomSearchToolCall>)this).Write(writer, ModelSerializationExtensions.WireOptions);
+
+        void IJsonModel<RunStepCustomSearchToolCall>.Write(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            writer.WriteStartObject();
+            JsonModelWriteCore(writer, options);
+            writer.WriteEndObject();
+        }
+
+        /// <param name="writer"> The JSON writer. </param>
+        /// <param name="options"> The client options for reading and writing models. </param>
+        protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepCustomSearchToolCall>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(RunStepCustomSearchToolCall)} does not support writing '{format}' format.");
+            }
+
+            base.JsonModelWriteCore(writer, options);
+            writer.WritePropertyName("bing_custom_search"u8);
+            writer.WriteStartObject();
+            foreach (var item in BingCustomSearch)
+            {
+                writer.WritePropertyName(item.Key);
+                writer.WriteStringValue(item.Value);
+            }
+            writer.WriteEndObject();
+        }
+
+        RunStepCustomSearchToolCall IJsonModel<RunStepCustomSearchToolCall>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepCustomSearchToolCall>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(RunStepCustomSearchToolCall)} does not support reading '{format}' format.");
+            }
+
+            using JsonDocument document = JsonDocument.ParseValue(ref reader);
+            return DeserializeRunStepCustomSearchToolCall(document.RootElement, options);
+        }
+
+        internal static RunStepCustomSearchToolCall DeserializeRunStepCustomSearchToolCall(JsonElement element, ModelReaderWriterOptions options = null)
+        {
+            options ??= ModelSerializationExtensions.WireOptions;
+
+            if (element.ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            IReadOnlyDictionary<string, string> bingCustomSearch = default;
+            string type = default;
+            string id = default;
+            IDictionary<string, BinaryData> serializedAdditionalRawData = default;
+            Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("bing_custom_search"u8))
+                {
+                    Dictionary<string, string> dictionary = new Dictionary<string, string>();
+                    foreach (var property0 in property.Value.EnumerateObject())
+                    {
+                        dictionary.Add(property0.Name, property0.Value.GetString());
+                    }
+                    bingCustomSearch = dictionary;
+                    continue;
+                }
+                if (property.NameEquals("type"u8))
+                {
+                    type = property.Value.GetString();
+                    continue;
+                }
+                if (property.NameEquals("id"u8))
+                {
+                    id = property.Value.GetString();
+                    continue;
+                }
+                if (options.Format != "W")
+                {
+                    rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
+                }
+            }
+            serializedAdditionalRawData = rawDataDictionary;
+            return new RunStepCustomSearchToolCall(type, id, serializedAdditionalRawData, bingCustomSearch);
+        }
+
+        BinaryData IPersistableModel<RunStepCustomSearchToolCall>.Write(ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepCustomSearchToolCall>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    return ModelReaderWriter.Write(this, options);
+                default:
+                    throw new FormatException($"The model {nameof(RunStepCustomSearchToolCall)} does not support writing '{options.Format}' format.");
+            }
+        }
+
+        RunStepCustomSearchToolCall IPersistableModel<RunStepCustomSearchToolCall>.Create(BinaryData data, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepCustomSearchToolCall>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    {
+                        using JsonDocument document = JsonDocument.Parse(data, ModelSerializationExtensions.JsonDocumentOptions);
+                        return DeserializeRunStepCustomSearchToolCall(document.RootElement, options);
+                    }
+                default:
+                    throw new FormatException($"The model {nameof(RunStepCustomSearchToolCall)} does not support reading '{options.Format}' format.");
+            }
+        }
+
+        string IPersistableModel<RunStepCustomSearchToolCall>.GetFormatFromOptions(ModelReaderWriterOptions options) => "J";
+
+        /// <summary> Deserializes the model from a raw response. </summary>
+        /// <param name="response"> The response to deserialize the model from. </param>
+        internal static new RunStepCustomSearchToolCall FromResponse(Response response)
+        {
+            using var document = JsonDocument.Parse(response.Content, ModelSerializationExtensions.JsonDocumentOptions);
+            return DeserializeRunStepCustomSearchToolCall(document.RootElement);
+        }
+
+        /// <summary> Convert into a <see cref="RequestContent"/>. </summary>
+        internal override RequestContent ToRequestContent()
+        {
+            var content = new Utf8JsonRequestContent();
+            content.JsonWriter.WriteObjectValue(this, ModelSerializationExtensions.WireOptions);
+            return content;
+        }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.cs
new file mode 100644
index 000000000000..dd6618679e2c
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepCustomSearchToolCall.cs
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+
+namespace Azure.AI.Projects
+{
+    /// <summary>
+    /// A record of a call to a bing custom search tool, issued by the model in evaluation of a defined tool, that represents
+    /// executed search with bing custom search.
+    /// </summary>
+    public partial class RunStepCustomSearchToolCall : RunStepToolCall
+    {
+        /// <summary> Initializes a new instance of <see cref="RunStepCustomSearchToolCall"/>. </summary>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="bingCustomSearch"> Reserved for future use. </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="id"/> or <paramref name="bingCustomSearch"/> is null. </exception>
+        internal RunStepCustomSearchToolCall(string id, IReadOnlyDictionary<string, string> bingCustomSearch) : base(id)
+        {
+            Argument.AssertNotNull(id, nameof(id));
+            Argument.AssertNotNull(bingCustomSearch, nameof(bingCustomSearch));
+
+            Type = "bing_custom_search";
+            BingCustomSearch = bingCustomSearch;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="RunStepCustomSearchToolCall"/>. </summary>
+        /// <param name="type"> The object type. </param>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
+        /// <param name="bingCustomSearch"> Reserved for future use. </param>
+        internal RunStepCustomSearchToolCall(string type, string id, IDictionary<string, BinaryData> serializedAdditionalRawData, IReadOnlyDictionary<string, string> bingCustomSearch) : base(type, id, serializedAdditionalRawData)
+        {
+            BingCustomSearch = bingCustomSearch;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="RunStepCustomSearchToolCall"/> for deserialization. </summary>
+        internal RunStepCustomSearchToolCall()
+        {
+        }
+
+        /// <summary> Reserved for future use. </summary>
+        public IReadOnlyDictionary<string, string> BingCustomSearch { get; }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.Serialization.cs
new file mode 100644
index 000000000000..1d23fe2a6498
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.Serialization.cs
@@ -0,0 +1,151 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Collections.Generic;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.AI.Projects
+{
+    public partial class RunStepOpenAPIToolCall : IUtf8JsonSerializable, IJsonModel<RunStepOpenAPIToolCall>
+    {
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer) => ((IJsonModel<RunStepOpenAPIToolCall>)this).Write(writer, ModelSerializationExtensions.WireOptions);
+
+        void IJsonModel<RunStepOpenAPIToolCall>.Write(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            writer.WriteStartObject();
+            JsonModelWriteCore(writer, options);
+            writer.WriteEndObject();
+        }
+
+        /// <param name="writer"> The JSON writer. </param>
+        /// <param name="options"> The client options for reading and writing models. </param>
+        protected override void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepOpenAPIToolCall>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(RunStepOpenAPIToolCall)} does not support writing '{format}' format.");
+            }
+
+            base.JsonModelWriteCore(writer, options);
+            writer.WritePropertyName("openapi"u8);
+            writer.WriteStartObject();
+            foreach (var item in OpenAPI)
+            {
+                writer.WritePropertyName(item.Key);
+                writer.WriteStringValue(item.Value);
+            }
+            writer.WriteEndObject();
+        }
+
+        RunStepOpenAPIToolCall IJsonModel<RunStepOpenAPIToolCall>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepOpenAPIToolCall>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(RunStepOpenAPIToolCall)} does not support reading '{format}' format.");
+            }
+
+            using JsonDocument document = JsonDocument.ParseValue(ref reader);
+            return DeserializeRunStepOpenAPIToolCall(document.RootElement, options);
+        }
+
+        internal static RunStepOpenAPIToolCall DeserializeRunStepOpenAPIToolCall(JsonElement element, ModelReaderWriterOptions options = null)
+        {
+            options ??= ModelSerializationExtensions.WireOptions;
+
+            if (element.ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            IReadOnlyDictionary<string, string> openapi = default;
+            string type = default;
+            string id = default;
+            IDictionary<string, BinaryData> serializedAdditionalRawData = default;
+            Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("openapi"u8))
+                {
+                    Dictionary<string, string> dictionary = new Dictionary<string, string>();
+                    foreach (var property0 in property.Value.EnumerateObject())
+                    {
+                        dictionary.Add(property0.Name, property0.Value.GetString());
+                    }
+                    openapi = dictionary;
+                    continue;
+                }
+                if (property.NameEquals("type"u8))
+                {
+                    type = property.Value.GetString();
+                    continue;
+                }
+                if (property.NameEquals("id"u8))
+                {
+                    id = property.Value.GetString();
+                    continue;
+                }
+                if (options.Format != "W")
+                {
+                    rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
+                }
+            }
+            serializedAdditionalRawData = rawDataDictionary;
+            return new RunStepOpenAPIToolCall(type, id, serializedAdditionalRawData, openapi);
+        }
+
+        BinaryData IPersistableModel<RunStepOpenAPIToolCall>.Write(ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepOpenAPIToolCall>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    return ModelReaderWriter.Write(this, options);
+                default:
+                    throw new FormatException($"The model {nameof(RunStepOpenAPIToolCall)} does not support writing '{options.Format}' format.");
+            }
+        }
+
+        RunStepOpenAPIToolCall IPersistableModel<RunStepOpenAPIToolCall>.Create(BinaryData data, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<RunStepOpenAPIToolCall>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    {
+                        using JsonDocument document = JsonDocument.Parse(data, ModelSerializationExtensions.JsonDocumentOptions);
+                        return DeserializeRunStepOpenAPIToolCall(document.RootElement, options);
+                    }
+                default:
+                    throw new FormatException($"The model {nameof(RunStepOpenAPIToolCall)} does not support reading '{options.Format}' format.");
+            }
+        }
+
+        string IPersistableModel<RunStepOpenAPIToolCall>.GetFormatFromOptions(ModelReaderWriterOptions options) => "J";
+
+        /// <summary> Deserializes the model from a raw response. </summary>
+        /// <param name="response"> The response to deserialize the model from. </param>
+        internal static new RunStepOpenAPIToolCall FromResponse(Response response)
+        {
+            using var document = JsonDocument.Parse(response.Content, ModelSerializationExtensions.JsonDocumentOptions);
+            return DeserializeRunStepOpenAPIToolCall(document.RootElement);
+        }
+
+        /// <summary> Convert into a <see cref="RequestContent"/>. </summary>
+        internal override RequestContent ToRequestContent()
+        {
+            var content = new Utf8JsonRequestContent();
+            content.JsonWriter.WriteObjectValue(this, ModelSerializationExtensions.WireOptions);
+            return content;
+        }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.cs
new file mode 100644
index 000000000000..309a45d57ea0
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepOpenAPIToolCall.cs
@@ -0,0 +1,50 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+
+namespace Azure.AI.Projects
+{
+    /// <summary>
+    /// A record of a call to an OpenAPI tool, issued by the model in evaluation of a defined tool, that represents
+    /// executed OpenAPI operations.
+    /// </summary>
+    public partial class RunStepOpenAPIToolCall : RunStepToolCall
+    {
+        /// <summary> Initializes a new instance of <see cref="RunStepOpenAPIToolCall"/>. </summary>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="openAPI"> Reserved for future use. </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="id"/> or <paramref name="openAPI"/> is null. </exception>
+        internal RunStepOpenAPIToolCall(string id, IReadOnlyDictionary<string, string> openAPI) : base(id)
+        {
+            Argument.AssertNotNull(id, nameof(id));
+            Argument.AssertNotNull(openAPI, nameof(openAPI));
+
+            Type = "openapi";
+            OpenAPI = openAPI;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="RunStepOpenAPIToolCall"/>. </summary>
+        /// <param name="type"> The object type. </param>
+        /// <param name="id"> The ID of the tool call. This ID must be referenced when you submit tool outputs. </param>
+        /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
+        /// <param name="openAPI"> Reserved for future use. </param>
+        internal RunStepOpenAPIToolCall(string type, string id, IDictionary<string, BinaryData> serializedAdditionalRawData, IReadOnlyDictionary<string, string> openAPI) : base(type, id, serializedAdditionalRawData)
+        {
+            OpenAPI = openAPI;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="RunStepOpenAPIToolCall"/> for deserialization. </summary>
+        internal RunStepOpenAPIToolCall()
+        {
+        }
+
+        /// <summary> Reserved for future use. </summary>
+        public IReadOnlyDictionary<string, string> OpenAPI { get; }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.Serialization.cs
index 3a545fa7adeb..52913e2c9a5f 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.Serialization.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.Serialization.cs
@@ -80,11 +80,13 @@ internal static RunStepToolCall DeserializeRunStepToolCall(JsonElement element,
                 switch (discriminator.GetString())
                 {
                     case "azure_ai_search": return RunStepAzureAISearchToolCall.DeserializeRunStepAzureAISearchToolCall(element, options);
+                    case "bing_custom_search": return RunStepCustomSearchToolCall.DeserializeRunStepCustomSearchToolCall(element, options);
                     case "bing_grounding": return RunStepBingGroundingToolCall.DeserializeRunStepBingGroundingToolCall(element, options);
                     case "code_interpreter": return RunStepCodeInterpreterToolCall.DeserializeRunStepCodeInterpreterToolCall(element, options);
                     case "fabric_dataagent": return RunStepMicrosoftFabricToolCall.DeserializeRunStepMicrosoftFabricToolCall(element, options);
                     case "file_search": return RunStepFileSearchToolCall.DeserializeRunStepFileSearchToolCall(element, options);
                     case "function": return RunStepFunctionToolCall.DeserializeRunStepFunctionToolCall(element, options);
+                    case "openapi": return RunStepOpenAPIToolCall.DeserializeRunStepOpenAPIToolCall(element, options);
                     case "sharepoint_grounding": return RunStepSharepointToolCall.DeserializeRunStepSharepointToolCall(element, options);
                 }
             }
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.cs
index 7b77b862d1a2..a800f6a76157 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCall.cs
@@ -13,7 +13,7 @@ namespace Azure.AI.Projects
     /// <summary>
     /// An abstract representation of a detailed tool call as recorded within a run step for an existing run.
     /// Please note <see cref="RunStepToolCall"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-    /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
+    /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepCustomSearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/>, <see cref="RunStepOpenAPIToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
     /// </summary>
     public abstract partial class RunStepToolCall
     {
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCallDetails.cs b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCallDetails.cs
index f734d2d76efe..00e943d0854b 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCallDetails.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/RunStepToolCallDetails.cs
@@ -18,7 +18,7 @@ public partial class RunStepToolCallDetails : RunStepDetails
         /// <param name="toolCalls">
         /// A list of tool call details for this run step.
         /// Please note <see cref="RunStepToolCall"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
+        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepCustomSearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/>, <see cref="RunStepOpenAPIToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
         /// </param>
         /// <exception cref="ArgumentNullException"> <paramref name="toolCalls"/> is null. </exception>
         internal RunStepToolCallDetails(IEnumerable<RunStepToolCall> toolCalls)
@@ -35,7 +35,7 @@ internal RunStepToolCallDetails(IEnumerable<RunStepToolCall> toolCalls)
         /// <param name="toolCalls">
         /// A list of tool call details for this run step.
         /// Please note <see cref="RunStepToolCall"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
+        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepCustomSearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/>, <see cref="RunStepOpenAPIToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
         /// </param>
         internal RunStepToolCallDetails(RunStepType type, IDictionary<string, BinaryData> serializedAdditionalRawData, IReadOnlyList<RunStepToolCall> toolCalls) : base(type, serializedAdditionalRawData)
         {
@@ -50,7 +50,7 @@ internal RunStepToolCallDetails()
         /// <summary>
         /// A list of tool call details for this run step.
         /// Please note <see cref="RunStepToolCall"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
+        /// The available derived classes include <see cref="RunStepAzureAISearchToolCall"/>, <see cref="RunStepCustomSearchToolCall"/>, <see cref="RunStepBingGroundingToolCall"/>, <see cref="RunStepCodeInterpreterToolCall"/>, <see cref="RunStepMicrosoftFabricToolCall"/>, <see cref="RunStepFileSearchToolCall"/>, <see cref="RunStepFunctionToolCall"/>, <see cref="RunStepOpenAPIToolCall"/> and <see cref="RunStepSharepointToolCall"/>.
         /// </summary>
         public IReadOnlyList<RunStepToolCall> ToolCalls { get; }
     }
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.Serialization.cs
new file mode 100644
index 000000000000..db3d6f44722d
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.Serialization.cs
@@ -0,0 +1,150 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Collections.Generic;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.AI.Projects
+{
+    public partial class SearchConfiguration : IUtf8JsonSerializable, IJsonModel<SearchConfiguration>
+    {
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer) => ((IJsonModel<SearchConfiguration>)this).Write(writer, ModelSerializationExtensions.WireOptions);
+
+        void IJsonModel<SearchConfiguration>.Write(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            writer.WriteStartObject();
+            JsonModelWriteCore(writer, options);
+            writer.WriteEndObject();
+        }
+
+        /// <param name="writer"> The JSON writer. </param>
+        /// <param name="options"> The client options for reading and writing models. </param>
+        protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfiguration>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(SearchConfiguration)} does not support writing '{format}' format.");
+            }
+
+            writer.WritePropertyName("connection_id"u8);
+            writer.WriteStringValue(ConnectionId);
+            writer.WritePropertyName("instance_name"u8);
+            writer.WriteStringValue(InstanceName);
+            if (options.Format != "W" && _serializedAdditionalRawData != null)
+            {
+                foreach (var item in _serializedAdditionalRawData)
+                {
+                    writer.WritePropertyName(item.Key);
+#if NET6_0_OR_GREATER
+				writer.WriteRawValue(item.Value);
+#else
+                    using (JsonDocument document = JsonDocument.Parse(item.Value, ModelSerializationExtensions.JsonDocumentOptions))
+                    {
+                        JsonSerializer.Serialize(writer, document.RootElement);
+                    }
+#endif
+                }
+            }
+        }
+
+        SearchConfiguration IJsonModel<SearchConfiguration>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfiguration>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(SearchConfiguration)} does not support reading '{format}' format.");
+            }
+
+            using JsonDocument document = JsonDocument.ParseValue(ref reader);
+            return DeserializeSearchConfiguration(document.RootElement, options);
+        }
+
+        internal static SearchConfiguration DeserializeSearchConfiguration(JsonElement element, ModelReaderWriterOptions options = null)
+        {
+            options ??= ModelSerializationExtensions.WireOptions;
+
+            if (element.ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            string connectionId = default;
+            string instanceName = default;
+            IDictionary<string, BinaryData> serializedAdditionalRawData = default;
+            Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("connection_id"u8))
+                {
+                    connectionId = property.Value.GetString();
+                    continue;
+                }
+                if (property.NameEquals("instance_name"u8))
+                {
+                    instanceName = property.Value.GetString();
+                    continue;
+                }
+                if (options.Format != "W")
+                {
+                    rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
+                }
+            }
+            serializedAdditionalRawData = rawDataDictionary;
+            return new SearchConfiguration(connectionId, instanceName, serializedAdditionalRawData);
+        }
+
+        BinaryData IPersistableModel<SearchConfiguration>.Write(ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfiguration>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    return ModelReaderWriter.Write(this, options);
+                default:
+                    throw new FormatException($"The model {nameof(SearchConfiguration)} does not support writing '{options.Format}' format.");
+            }
+        }
+
+        SearchConfiguration IPersistableModel<SearchConfiguration>.Create(BinaryData data, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfiguration>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    {
+                        using JsonDocument document = JsonDocument.Parse(data, ModelSerializationExtensions.JsonDocumentOptions);
+                        return DeserializeSearchConfiguration(document.RootElement, options);
+                    }
+                default:
+                    throw new FormatException($"The model {nameof(SearchConfiguration)} does not support reading '{options.Format}' format.");
+            }
+        }
+
+        string IPersistableModel<SearchConfiguration>.GetFormatFromOptions(ModelReaderWriterOptions options) => "J";
+
+        /// <summary> Deserializes the model from a raw response. </summary>
+        /// <param name="response"> The response to deserialize the model from. </param>
+        internal static SearchConfiguration FromResponse(Response response)
+        {
+            using var document = JsonDocument.Parse(response.Content, ModelSerializationExtensions.JsonDocumentOptions);
+            return DeserializeSearchConfiguration(document.RootElement);
+        }
+
+        /// <summary> Convert into a <see cref="RequestContent"/>. </summary>
+        internal virtual RequestContent ToRequestContent()
+        {
+            var content = new Utf8JsonRequestContent();
+            content.JsonWriter.WriteObjectValue(this, ModelSerializationExtensions.WireOptions);
+            return content;
+        }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.cs b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.cs
new file mode 100644
index 000000000000..8885b81cd971
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfiguration.cs
@@ -0,0 +1,82 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+
+namespace Azure.AI.Projects
+{
+    /// <summary> A custom search configuration. </summary>
+    public partial class SearchConfiguration
+    {
+        /// <summary>
+        /// Keeps track of any properties unknown to the library.
+        /// <para>
+        /// To assign an object to the value of this property use <see cref="BinaryData.FromObjectAsJson{T}(T, System.Text.Json.JsonSerializerOptions?)"/>.
+        /// </para>
+        /// <para>
+        /// To assign an already formatted json string to this property use <see cref="BinaryData.FromString(string)"/>.
+        /// </para>
+        /// <para>
+        /// Examples:
+        /// <list type="bullet">
+        /// <item>
+        /// <term>BinaryData.FromObjectAsJson("foo")</term>
+        /// <description>Creates a payload of "foo".</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromString("\"foo\"")</term>
+        /// <description>Creates a payload of "foo".</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromObjectAsJson(new { key = "value" })</term>
+        /// <description>Creates a payload of { "key": "value" }.</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromString("{\"key\": \"value\"}")</term>
+        /// <description>Creates a payload of { "key": "value" }.</description>
+        /// </item>
+        /// </list>
+        /// </para>
+        /// </summary>
+        private IDictionary<string, BinaryData> _serializedAdditionalRawData;
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfiguration"/>. </summary>
+        /// <param name="connectionId"> A connection in a ToolConnectionList attached to this tool. </param>
+        /// <param name="instanceName"> Name of the custom configuration instance given to config. </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="connectionId"/> or <paramref name="instanceName"/> is null. </exception>
+        public SearchConfiguration(string connectionId, string instanceName)
+        {
+            Argument.AssertNotNull(connectionId, nameof(connectionId));
+            Argument.AssertNotNull(instanceName, nameof(instanceName));
+
+            ConnectionId = connectionId;
+            InstanceName = instanceName;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfiguration"/>. </summary>
+        /// <param name="connectionId"> A connection in a ToolConnectionList attached to this tool. </param>
+        /// <param name="instanceName"> Name of the custom configuration instance given to config. </param>
+        /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
+        internal SearchConfiguration(string connectionId, string instanceName, IDictionary<string, BinaryData> serializedAdditionalRawData)
+        {
+            ConnectionId = connectionId;
+            InstanceName = instanceName;
+            _serializedAdditionalRawData = serializedAdditionalRawData;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfiguration"/> for deserialization. </summary>
+        internal SearchConfiguration()
+        {
+        }
+
+        /// <summary> A connection in a ToolConnectionList attached to this tool. </summary>
+        public string ConnectionId { get; set; }
+        /// <summary> Name of the custom configuration instance given to config. </summary>
+        public string InstanceName { get; set; }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.Serialization.cs
new file mode 100644
index 000000000000..91f01ba590a8
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.Serialization.cs
@@ -0,0 +1,152 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.ClientModel.Primitives;
+using System.Collections.Generic;
+using System.Text.Json;
+using Azure.Core;
+
+namespace Azure.AI.Projects
+{
+    public partial class SearchConfigurationList : IUtf8JsonSerializable, IJsonModel<SearchConfigurationList>
+    {
+        void IUtf8JsonSerializable.Write(Utf8JsonWriter writer) => ((IJsonModel<SearchConfigurationList>)this).Write(writer, ModelSerializationExtensions.WireOptions);
+
+        void IJsonModel<SearchConfigurationList>.Write(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            writer.WriteStartObject();
+            JsonModelWriteCore(writer, options);
+            writer.WriteEndObject();
+        }
+
+        /// <param name="writer"> The JSON writer. </param>
+        /// <param name="options"> The client options for reading and writing models. </param>
+        protected virtual void JsonModelWriteCore(Utf8JsonWriter writer, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfigurationList>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(SearchConfigurationList)} does not support writing '{format}' format.");
+            }
+
+            writer.WritePropertyName("search_configurations"u8);
+            writer.WriteStartArray();
+            foreach (var item in SearchConfigurations)
+            {
+                writer.WriteObjectValue(item, options);
+            }
+            writer.WriteEndArray();
+            if (options.Format != "W" && _serializedAdditionalRawData != null)
+            {
+                foreach (var item in _serializedAdditionalRawData)
+                {
+                    writer.WritePropertyName(item.Key);
+#if NET6_0_OR_GREATER
+				writer.WriteRawValue(item.Value);
+#else
+                    using (JsonDocument document = JsonDocument.Parse(item.Value, ModelSerializationExtensions.JsonDocumentOptions))
+                    {
+                        JsonSerializer.Serialize(writer, document.RootElement);
+                    }
+#endif
+                }
+            }
+        }
+
+        SearchConfigurationList IJsonModel<SearchConfigurationList>.Create(ref Utf8JsonReader reader, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfigurationList>)this).GetFormatFromOptions(options) : options.Format;
+            if (format != "J")
+            {
+                throw new FormatException($"The model {nameof(SearchConfigurationList)} does not support reading '{format}' format.");
+            }
+
+            using JsonDocument document = JsonDocument.ParseValue(ref reader);
+            return DeserializeSearchConfigurationList(document.RootElement, options);
+        }
+
+        internal static SearchConfigurationList DeserializeSearchConfigurationList(JsonElement element, ModelReaderWriterOptions options = null)
+        {
+            options ??= ModelSerializationExtensions.WireOptions;
+
+            if (element.ValueKind == JsonValueKind.Null)
+            {
+                return null;
+            }
+            IList<SearchConfiguration> searchConfigurations = default;
+            IDictionary<string, BinaryData> serializedAdditionalRawData = default;
+            Dictionary<string, BinaryData> rawDataDictionary = new Dictionary<string, BinaryData>();
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("search_configurations"u8))
+                {
+                    List<SearchConfiguration> array = new List<SearchConfiguration>();
+                    foreach (var item in property.Value.EnumerateArray())
+                    {
+                        array.Add(SearchConfiguration.DeserializeSearchConfiguration(item, options));
+                    }
+                    searchConfigurations = array;
+                    continue;
+                }
+                if (options.Format != "W")
+                {
+                    rawDataDictionary.Add(property.Name, BinaryData.FromString(property.Value.GetRawText()));
+                }
+            }
+            serializedAdditionalRawData = rawDataDictionary;
+            return new SearchConfigurationList(searchConfigurations, serializedAdditionalRawData);
+        }
+
+        BinaryData IPersistableModel<SearchConfigurationList>.Write(ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfigurationList>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    return ModelReaderWriter.Write(this, options);
+                default:
+                    throw new FormatException($"The model {nameof(SearchConfigurationList)} does not support writing '{options.Format}' format.");
+            }
+        }
+
+        SearchConfigurationList IPersistableModel<SearchConfigurationList>.Create(BinaryData data, ModelReaderWriterOptions options)
+        {
+            var format = options.Format == "W" ? ((IPersistableModel<SearchConfigurationList>)this).GetFormatFromOptions(options) : options.Format;
+
+            switch (format)
+            {
+                case "J":
+                    {
+                        using JsonDocument document = JsonDocument.Parse(data, ModelSerializationExtensions.JsonDocumentOptions);
+                        return DeserializeSearchConfigurationList(document.RootElement, options);
+                    }
+                default:
+                    throw new FormatException($"The model {nameof(SearchConfigurationList)} does not support reading '{options.Format}' format.");
+            }
+        }
+
+        string IPersistableModel<SearchConfigurationList>.GetFormatFromOptions(ModelReaderWriterOptions options) => "J";
+
+        /// <summary> Deserializes the model from a raw response. </summary>
+        /// <param name="response"> The response to deserialize the model from. </param>
+        internal static SearchConfigurationList FromResponse(Response response)
+        {
+            using var document = JsonDocument.Parse(response.Content, ModelSerializationExtensions.JsonDocumentOptions);
+            return DeserializeSearchConfigurationList(document.RootElement);
+        }
+
+        /// <summary> Convert into a <see cref="RequestContent"/>. </summary>
+        internal virtual RequestContent ToRequestContent()
+        {
+            var content = new Utf8JsonRequestContent();
+            content.JsonWriter.WriteObjectValue(this, ModelSerializationExtensions.WireOptions);
+            return content;
+        }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.cs b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.cs
new file mode 100644
index 000000000000..8847f00e6f20
--- /dev/null
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/SearchConfigurationList.cs
@@ -0,0 +1,85 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Azure.AI.Projects
+{
+    /// <summary> A list of search configurations currently used by the `bing_custom_search` tool. </summary>
+    public partial class SearchConfigurationList
+    {
+        /// <summary>
+        /// Keeps track of any properties unknown to the library.
+        /// <para>
+        /// To assign an object to the value of this property use <see cref="BinaryData.FromObjectAsJson{T}(T, System.Text.Json.JsonSerializerOptions?)"/>.
+        /// </para>
+        /// <para>
+        /// To assign an already formatted json string to this property use <see cref="BinaryData.FromString(string)"/>.
+        /// </para>
+        /// <para>
+        /// Examples:
+        /// <list type="bullet">
+        /// <item>
+        /// <term>BinaryData.FromObjectAsJson("foo")</term>
+        /// <description>Creates a payload of "foo".</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromString("\"foo\"")</term>
+        /// <description>Creates a payload of "foo".</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromObjectAsJson(new { key = "value" })</term>
+        /// <description>Creates a payload of { "key": "value" }.</description>
+        /// </item>
+        /// <item>
+        /// <term>BinaryData.FromString("{\"key\": \"value\"}")</term>
+        /// <description>Creates a payload of { "key": "value" }.</description>
+        /// </item>
+        /// </list>
+        /// </para>
+        /// </summary>
+        private IDictionary<string, BinaryData> _serializedAdditionalRawData;
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfigurationList"/>. </summary>
+        /// <param name="searchConfigurations">
+        /// The connections attached to this tool. There can be a maximum of 1 connection
+        /// resource attached to the tool.
+        /// </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="searchConfigurations"/> is null. </exception>
+        public SearchConfigurationList(IEnumerable<SearchConfiguration> searchConfigurations)
+        {
+            Argument.AssertNotNull(searchConfigurations, nameof(searchConfigurations));
+
+            SearchConfigurations = searchConfigurations.ToList();
+        }
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfigurationList"/>. </summary>
+        /// <param name="searchConfigurations">
+        /// The connections attached to this tool. There can be a maximum of 1 connection
+        /// resource attached to the tool.
+        /// </param>
+        /// <param name="serializedAdditionalRawData"> Keeps track of any properties unknown to the library. </param>
+        internal SearchConfigurationList(IList<SearchConfiguration> searchConfigurations, IDictionary<string, BinaryData> serializedAdditionalRawData)
+        {
+            SearchConfigurations = searchConfigurations;
+            _serializedAdditionalRawData = serializedAdditionalRawData;
+        }
+
+        /// <summary> Initializes a new instance of <see cref="SearchConfigurationList"/> for deserialization. </summary>
+        internal SearchConfigurationList()
+        {
+        }
+
+        /// <summary>
+        /// The connections attached to this tool. There can be a maximum of 1 connection
+        /// resource attached to the tool.
+        /// </summary>
+        public IList<SearchConfiguration> SearchConfigurations { get; }
+    }
+}
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/ThreadRun.cs b/sdk/ai/Azure.AI.Projects/src/Generated/ThreadRun.cs
index e26dcc9823d4..67aea1986f61 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/ThreadRun.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/ThreadRun.cs
@@ -57,7 +57,7 @@ public partial class ThreadRun
         /// <param name="tools">
         /// The overridden enabled tools used for this agent thread run.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="createdAt"> The Unix timestamp, in seconds, representing when this object was created. </param>
         /// <param name="expiresAt"> The Unix timestamp, in seconds, representing when this item expires. </param>
@@ -126,7 +126,7 @@ internal ThreadRun(string id, string threadId, string assistantId, RunStatus sta
         /// <param name="tools">
         /// The overridden enabled tools used for this agent thread run.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="createdAt"> The Unix timestamp, in seconds, representing when this object was created. </param>
         /// <param name="expiresAt"> The Unix timestamp, in seconds, representing when this item expires. </param>
@@ -209,7 +209,7 @@ internal ThreadRun()
         /// <summary>
         /// The overridden enabled tools used for this agent thread run.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> Tools { get; }
         /// <summary> The Unix timestamp, in seconds, representing when this object was created. </summary>
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.Serialization.cs b/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.Serialization.cs
index cf029a42c888..49f18c3eb0d4 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.Serialization.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.Serialization.cs
@@ -79,6 +79,7 @@ internal static ToolDefinition DeserializeToolDefinition(JsonElement element, Mo
                 {
                     case "azure_ai_search": return AzureAISearchToolDefinition.DeserializeAzureAISearchToolDefinition(element, options);
                     case "azure_function": return AzureFunctionToolDefinition.DeserializeAzureFunctionToolDefinition(element, options);
+                    case "bing_custom_search": return BingCustomSearchToolDefinition.DeserializeBingCustomSearchToolDefinition(element, options);
                     case "bing_grounding": return BingGroundingToolDefinition.DeserializeBingGroundingToolDefinition(element, options);
                     case "code_interpreter": return CodeInterpreterToolDefinition.DeserializeCodeInterpreterToolDefinition(element, options);
                     case "fabric_dataagent": return MicrosoftFabricToolDefinition.DeserializeMicrosoftFabricToolDefinition(element, options);
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.cs b/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.cs
index 212407f403df..46adb7e03811 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/ToolDefinition.cs
@@ -13,7 +13,7 @@ namespace Azure.AI.Projects
     /// <summary>
     /// An abstract representation of an input tool definition that an agent can use.
     /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-    /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+    /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
     /// </summary>
     public abstract partial class ToolDefinition
     {
diff --git a/sdk/ai/Azure.AI.Projects/src/Generated/UpdateAgentRequest.cs b/sdk/ai/Azure.AI.Projects/src/Generated/UpdateAgentRequest.cs
index 6768e4d7de9e..16676e8aeb33 100644
--- a/sdk/ai/Azure.AI.Projects/src/Generated/UpdateAgentRequest.cs
+++ b/sdk/ai/Azure.AI.Projects/src/Generated/UpdateAgentRequest.cs
@@ -60,7 +60,7 @@ internal UpdateAgentRequest()
         /// <param name="tools">
         /// The modified collection of tools to enable for the agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </param>
         /// <param name="toolResources">
         /// A set of resources that are used by the agent's tools. The resources are specific to the type of tool. For example,
@@ -105,7 +105,7 @@ internal UpdateAgentRequest(string model, string name, string description, strin
         /// <summary>
         /// The modified collection of tools to enable for the agent.
         /// Please note <see cref="ToolDefinition"/> is the base class. According to the scenario, a derived class of the base class might need to be assigned here, or this property needs to be casted to one of the possible derived classes.
-        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
+        /// The available derived classes include <see cref="AzureAISearchToolDefinition"/>, <see cref="AzureFunctionToolDefinition"/>, <see cref="BingCustomSearchToolDefinition"/>, <see cref="BingGroundingToolDefinition"/>, <see cref="CodeInterpreterToolDefinition"/>, <see cref="MicrosoftFabricToolDefinition"/>, <see cref="FileSearchToolDefinition"/>, <see cref="FunctionToolDefinition"/>, <see cref="OpenApiToolDefinition"/> and <see cref="SharepointToolDefinition"/>.
         /// </summary>
         public IReadOnlyList<ToolDefinition> Tools { get; }
         /// <summary>
diff --git a/sdk/ai/Azure.AI.Projects/tsp-location.yaml b/sdk/ai/Azure.AI.Projects/tsp-location.yaml
index 2c08336fedea..03dca6cdd528 100644
--- a/sdk/ai/Azure.AI.Projects/tsp-location.yaml
+++ b/sdk/ai/Azure.AI.Projects/tsp-location.yaml
@@ -1,4 +1,4 @@
 directory: specification/ai/Azure.AI.Projects
-commit: 366f7e94f14f6c2a4af81b9b0b6726751de97da7
+commit: 0dc7a1328084a211acb4a583b65a2e3e6f496217
 repo: Azure/azure-rest-api-specs
 additionalDirectories: