Feature request for file changes event

まず、SDK の既存のセッションイベントモデルを、提案されている AssistantFileChangesEvent と AssistantFileChangeData の構造と照らし合わせて確認します。ファイル変更イベントが各変更の diff、kind、path、move_path フィールドを公開し、クライアントがイテレーション中に変更されたファイルを表示できるようになれば、この機能は完了です。

This is a feature request.

Currently it seems that we don't receive any events for changed files with their diff, which makes it difficult with the SDK to report nicely what GitHub Copilot has changed during a prompt iteration.

An example of such API in C# could be:

public partial class AssistantFileChangesEvent : SessionEvent
{
    [JsonIgnore]
    public override string Type => "assistant.file_changes";

    [JsonPropertyName("changes")]
    public required List<AssistantFileChangeData> Changes { get; set; }
}

public partial class AssistantFileChangeData
{
    [JsonPropertyName("diff")]
    public string Diff { get; set; } = string.Empty;
    [JsonPropertyName("kind")]
    public AssistantFileChangeKind Kind { get; set; } = default!;
    [JsonPropertyName("path")]
    public string Path { get; set; } = string.Empty;
    [JsonPropertyName("move_path")]
    public string MovePath { get; set; } = string.Empty; // When kind == "update"
}

[JsonConverter(typeof(JsonStringEnumConverter<AssistantFileChangeKind>))]
public enum AssistantFileChangeKind
{
    [JsonStringEnumMemberName("add")]
    Add,
    [JsonStringEnumMemberName("delete")]
    Delete,
    [JsonStringEnumMemberName("update")]
    Update,  // Use "move_path"  
}

It would allow to display more nicely during a user/assistant iteration the files that were modified.