diff --git a/dotnet/src/Client.cs b/dotnet/src/Client.cs
index c1dc311d..912ab93e 100644
--- a/dotnet/src/Client.cs
+++ b/dotnet/src/Client.cs
@@ -1052,16 +1052,16 @@ private sealed class LoggerTraceListener(ILogger logger) : TraceListener
             public override void TraceEvent(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, string? message) =>
                 logger.Log(MapLevel(eventType), "[{Source}] {Message}", source, message);
 
-            public override void TraceEvent(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, string? format, params object?[]? args) => 
+            public override void TraceEvent(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, string? format, params object?[]? args) =>
                 logger.Log(MapLevel(eventType), "[{Source}] {Message}", source, args is null || args.Length == 0 ? format : string.Format(format ?? "", args));
 
-            public override void TraceData(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, object? data) => 
+            public override void TraceData(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, object? data) =>
                 logger.Log(MapLevel(eventType), "[{Source}] {Data}", source, data);
 
-            public override void TraceData(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, params object?[]? data) => 
+            public override void TraceData(TraceEventCache? eventCache, string source, TraceEventType eventType, int id, params object?[]? data) =>
                 logger.Log(MapLevel(eventType), "[{Source}] {Data}", source, data is null ? null : string.Join(", ", data));
 
-            public override void Write(string? message) => 
+            public override void Write(string? message) =>
                 logger.LogTrace("{Message}", message);
 
             public override void WriteLine(string? message) =>
diff --git a/dotnet/src/Generated/SessionEvents.cs b/dotnet/src/Generated/SessionEvents.cs
index 487ff684..ea9b3e2d 100644
--- a/dotnet/src/Generated/SessionEvents.cs
+++ b/dotnet/src/Generated/SessionEvents.cs
@@ -6,7 +6,7 @@
 //
 // Generated from: @github/copilot/session-events.schema.json
 // Generated by: scripts/generate-session-types.ts
-// Generated at: 2026-01-22T13:45:56.468Z
+// Generated at: 2026-01-22T14:30:57.371Z
 //
 // To update these types:
 // 1. Update the schema in copilot-agent-runtime
@@ -21,7 +21,7 @@ namespace GitHub.Copilot.SDK;
 /// Base class for all session events with polymorphic JSON serialization.
 /// </summary>
 [JsonPolymorphic(
-    TypeDiscriminatorPropertyName = "type", 
+    TypeDiscriminatorPropertyName = "type",
     UnknownDerivedTypeHandling = JsonUnknownDerivedTypeHandling.FailSerialization)]
 [JsonDerivedType(typeof(AbortEvent), "abort")]
 [JsonDerivedType(typeof(AssistantIntentEvent), "assistant.intent")]
@@ -53,6 +53,7 @@ namespace GitHub.Copilot.SDK;
 [JsonDerivedType(typeof(SystemMessageEvent), "system.message")]
 [JsonDerivedType(typeof(ToolExecutionCompleteEvent), "tool.execution_complete")]
 [JsonDerivedType(typeof(ToolExecutionPartialResultEvent), "tool.execution_partial_result")]
+[JsonDerivedType(typeof(ToolExecutionProgressEvent), "tool.execution_progress")]
 [JsonDerivedType(typeof(ToolExecutionStartEvent), "tool.execution_start")]
 [JsonDerivedType(typeof(ToolUserRequestedEvent), "tool.user_requested")]
 [JsonDerivedType(typeof(UserMessageEvent), "user.message")]
@@ -384,6 +385,18 @@ public partial class ToolExecutionPartialResultEvent : SessionEvent
     public required ToolExecutionPartialResultData Data { get; set; }
 }
 
+/// <summary>
+/// Event: tool.execution_progress
+/// </summary>
+public partial class ToolExecutionProgressEvent : SessionEvent
+{
+    [JsonIgnore]
+    public override string Type => "tool.execution_progress";
+
+    [JsonPropertyName("data")]
+    public required ToolExecutionProgressData Data { get; set; }
+}
+
 /// <summary>
 /// Event: tool.execution_complete
 /// </summary>
@@ -845,6 +858,15 @@ public partial class ToolExecutionPartialResultData
     public required string PartialOutput { get; set; }
 }
 
+public partial class ToolExecutionProgressData
+{
+    [JsonPropertyName("toolCallId")]
+    public required string ToolCallId { get; set; }
+
+    [JsonPropertyName("progressMessage")]
+    public required string ProgressMessage { get; set; }
+}
+
 public partial class ToolExecutionCompleteData
 {
     [JsonPropertyName("toolCallId")]
@@ -1099,41 +1121,41 @@ public partial class SystemMessageDataMetadata
     public Dictionary<string, object>? Variables { get; set; }
 }
 
-    [JsonConverter(typeof(JsonStringEnumConverter<SessionHandoffDataSourceType>))]
-    public enum SessionHandoffDataSourceType
-    {
-        [JsonStringEnumMemberName("remote")]
-        Remote,
-        [JsonStringEnumMemberName("local")]
-        Local,
-    }
-
-    [JsonConverter(typeof(JsonStringEnumConverter<UserMessageDataAttachmentsItemType>))]
-    public enum UserMessageDataAttachmentsItemType
-    {
-        [JsonStringEnumMemberName("file")]
-        File,
-        [JsonStringEnumMemberName("directory")]
-        Directory,
-    }
-
-    [JsonConverter(typeof(JsonStringEnumConverter<AssistantMessageDataToolRequestsItemType>))]
-    public enum AssistantMessageDataToolRequestsItemType
-    {
-        [JsonStringEnumMemberName("function")]
-        Function,
-        [JsonStringEnumMemberName("custom")]
-        Custom,
-    }
-
-    [JsonConverter(typeof(JsonStringEnumConverter<SystemMessageDataRole>))]
-    public enum SystemMessageDataRole
-    {
-        [JsonStringEnumMemberName("system")]
-        System,
-        [JsonStringEnumMemberName("developer")]
-        Developer,
-    }
+[JsonConverter(typeof(JsonStringEnumConverter<SessionHandoffDataSourceType>))]
+public enum SessionHandoffDataSourceType
+{
+    [JsonStringEnumMemberName("remote")]
+    Remote,
+    [JsonStringEnumMemberName("local")]
+    Local,
+}
+
+[JsonConverter(typeof(JsonStringEnumConverter<UserMessageDataAttachmentsItemType>))]
+public enum UserMessageDataAttachmentsItemType
+{
+    [JsonStringEnumMemberName("file")]
+    File,
+    [JsonStringEnumMemberName("directory")]
+    Directory,
+}
+
+[JsonConverter(typeof(JsonStringEnumConverter<AssistantMessageDataToolRequestsItemType>))]
+public enum AssistantMessageDataToolRequestsItemType
+{
+    [JsonStringEnumMemberName("function")]
+    Function,
+    [JsonStringEnumMemberName("custom")]
+    Custom,
+}
+
+[JsonConverter(typeof(JsonStringEnumConverter<SystemMessageDataRole>))]
+public enum SystemMessageDataRole
+{
+    [JsonStringEnumMemberName("system")]
+    System,
+    [JsonStringEnumMemberName("developer")]
+    Developer,
+}
 
 [JsonSourceGenerationOptions(
     JsonSerializerDefaults.Web,
@@ -1210,6 +1232,8 @@ public enum SystemMessageDataRole
 [JsonSerializable(typeof(ToolExecutionCompleteEvent))]
 [JsonSerializable(typeof(ToolExecutionPartialResultData))]
 [JsonSerializable(typeof(ToolExecutionPartialResultEvent))]
+[JsonSerializable(typeof(ToolExecutionProgressData))]
+[JsonSerializable(typeof(ToolExecutionProgressEvent))]
 [JsonSerializable(typeof(ToolExecutionStartData))]
 [JsonSerializable(typeof(ToolExecutionStartEvent))]
 [JsonSerializable(typeof(ToolUserRequestedData))]
diff --git a/nodejs/scripts/generate-csharp-session-types.ts b/nodejs/scripts/generate-csharp-session-types.ts
index dc2e82b9..722737b6 100644
--- a/nodejs/scripts/generate-csharp-session-types.ts
+++ b/nodejs/scripts/generate-csharp-session-types.ts
@@ -169,15 +169,15 @@ function getOrCreateEnum(
 
     // Generate the enum code with JsonConverter and JsonStringEnumMemberName attributes
     const lines: string[] = [];
-    lines.push(`    [JsonConverter(typeof(JsonStringEnumConverter<${enumName}>))]`);
-    lines.push(`    public enum ${enumName}`);
-    lines.push(`    {`);
+    lines.push(`[JsonConverter(typeof(JsonStringEnumConverter<${enumName}>))]`);
+    lines.push(`public enum ${enumName}`);
+    lines.push(`{`);
     for (const value of values) {
         const memberName = toPascalCaseEnumMember(value);
-        lines.push(`        [JsonStringEnumMemberName("${value}")]`);
-        lines.push(`        ${memberName},`);
+        lines.push(`    [JsonStringEnumMemberName("${value}")]`);
+        lines.push(`    ${memberName},`);
     }
-    lines.push(`    }`);
+    lines.push(`}`);
     lines.push("");
 
     enumOutput.push(lines.join("\n"));
@@ -501,7 +501,7 @@ namespace GitHub.Copilot.SDK;
     );
     lines.push(`/// </summary>`);
     lines.push(`[JsonPolymorphic(`);
-    lines.push(`    TypeDiscriminatorPropertyName = "type", `);
+    lines.push(`    TypeDiscriminatorPropertyName = "type",`);
     lines.push(
         `    UnknownDerivedTypeHandling = JsonUnknownDerivedTypeHandling.FailSerialization)]`
     );