diff --git a/dotnet/src/webdriver/BiDi/Modules/BrowsingContext/UserPromptOpenedEventArgs.cs b/dotnet/src/webdriver/BiDi/Modules/BrowsingContext/UserPromptOpenedEventArgs.cs
index e6b8a1541c0c6..2a748c34a3c9c 100644
--- a/dotnet/src/webdriver/BiDi/Modules/BrowsingContext/UserPromptOpenedEventArgs.cs
+++ b/dotnet/src/webdriver/BiDi/Modules/BrowsingContext/UserPromptOpenedEventArgs.cs
@@ -21,7 +21,7 @@
 
 namespace OpenQA.Selenium.BiDi.Modules.BrowsingContext;
 
-public record UserPromptOpenedEventArgs(BiDi BiDi, BrowsingContext Context, UserPromptType Type, string Message)
+public record UserPromptOpenedEventArgs(BiDi BiDi, BrowsingContext Context, Session.UserPromptHandlerType Handler, UserPromptType Type, string Message)
     : BrowsingContextEventArgs(BiDi, Context)
 {
     [JsonInclude]
diff --git a/dotnet/src/webdriver/BiDi/Modules/Session/CapabilitiesRequest.cs b/dotnet/src/webdriver/BiDi/Modules/Session/CapabilitiesRequest.cs
index df1b8498786bc..3740ce75cbb1f 100644
--- a/dotnet/src/webdriver/BiDi/Modules/Session/CapabilitiesRequest.cs
+++ b/dotnet/src/webdriver/BiDi/Modules/Session/CapabilitiesRequest.cs
@@ -21,7 +21,7 @@
 
 namespace OpenQA.Selenium.BiDi.Modules.Session;
 
-public class CapabilitiesRequest
+public record CapabilitiesRequest
 {
     public CapabilityRequest? AlwaysMatch { get; set; }
 
diff --git a/dotnet/src/webdriver/BiDi/Modules/Session/CapabilityRequest.cs b/dotnet/src/webdriver/BiDi/Modules/Session/CapabilityRequest.cs
index e035f1f9687bc..a5878f7597768 100644
--- a/dotnet/src/webdriver/BiDi/Modules/Session/CapabilityRequest.cs
+++ b/dotnet/src/webdriver/BiDi/Modules/Session/CapabilityRequest.cs
@@ -19,7 +19,7 @@
 
 namespace OpenQA.Selenium.BiDi.Modules.Session;
 
-public class CapabilityRequest
+public record CapabilityRequest
 {
     public bool? AcceptInsecureCerts { get; set; }
 
@@ -31,5 +31,5 @@ public class CapabilityRequest
 
     public ProxyConfiguration? ProxyConfiguration { get; set; }
 
-    public bool? WebSocketUrl { get; set; }
+    public UserPromptHandler? UnhandledPromptBehavior { get; set; }
 }
diff --git a/dotnet/src/webdriver/BiDi/Modules/Session/UserPromptHandler.cs b/dotnet/src/webdriver/BiDi/Modules/Session/UserPromptHandler.cs
new file mode 100644
index 0000000000000..edd7a815aeb36
--- /dev/null
+++ b/dotnet/src/webdriver/BiDi/Modules/Session/UserPromptHandler.cs
@@ -0,0 +1,42 @@
+// <copyright file="UserPromptHandler.cs" company="Selenium Committers">
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+// </copyright>
+
+namespace OpenQA.Selenium.BiDi.Modules.Session;
+
+public record UserPromptHandler
+{
+    public UserPromptHandlerType? Alert { get; set; }
+
+    public UserPromptHandlerType? BeforeUnload { get; set; }
+
+    public UserPromptHandlerType? Confirm { get; set; }
+
+    public UserPromptHandlerType? Default { get; set; }
+
+    public UserPromptHandlerType? File { get; set; }
+
+    public UserPromptHandlerType? Prompt { get; set; }
+}
+
+public enum UserPromptHandlerType
+{
+    Accept,
+    Dismiss,
+    Ignore
+}