Repository: microsoft/semantic-kernel
File: dotnet/src/Agents/OpenAI/OpenAIResponseAgentThread.cs (C#)

Code before:
/// <summary>
/// Represents a conversation thread for an OpenAI Response API based agent when store is enabled.
/// </summary>
[ExcludeFromCodeCoverage]
public sealed class OpenAIResponseAgentThread : AgentThread
{
    private readonly OpenAIResponseClient _client;
    private bool _isDeleted = false;

    /// <summary>
    /// Initializes a new instance of the <see cref="OpenAIResponseAgentThread"/> class.
    /// </summary>
    /// <param name="client">The agents client to use for interacting with responses.</param>
    public OpenAIResponseAgentThread(OpenAIResponseClient client)
    {
        Verify.NotNull(client);

        this._client = client;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="OpenAIResponseAgentThread"/> class that resumes an existing response.
    /// </summary>
    /// <param name="client">The agents client to use for interacting with responses.</param>
    /// <param name="id">The ID of an existing response to resume.</param>
    public OpenAIResponseAgentThread(OpenAIResponseClient client, string id)
    {
        Verify.NotNull(client);
        Verify.NotNull(id);

        this._client = client;
        this.ResponseId = id;
    }

    /// <summary>
    /// The current response id.
    /// </summary>
    internal string? ResponseId { get; set; }

    /// <inheritdoc />
    public override string? Id => this.ResponseId;

    /// <inheritdoc />
    protected override Task<string?> CreateInternalAsync(CancellationToken cancellationToken = default)
    {
        if (this._isDeleted)
        {
            throw new InvalidOperationException("This thread has been deleted and cannot be recreated.");
        }

        // Id will not be available until after a message is sent

Review comment (suggestion):
nit.
Is this experimental? Can we change this? suggest using responseId here, not clear what id this is referring to.

```suggestion
    public OpenAIResponseAgentThread(OpenAIResponseClient client, string responseId)
```

Code after:
/// <summary>
/// Represents a conversation thread for an OpenAI Response API based agent when store is enabled.
/// </summary>
[ExcludeFromCodeCoverage]
public sealed class OpenAIResponseAgentThread : AgentThread
{
    private readonly OpenAIResponseClient _client;
    private bool _isDeleted = false;

    /// <summary>
    /// Initializes a new instance of the <see cref="OpenAIResponseAgentThread"/> class.
    /// </summary>
    /// <param name="client">The agents client to use for interacting with responses.</param>
    public OpenAIResponseAgentThread(OpenAIResponseClient client)
    {
        Verify.NotNull(client);

        this._client = client;
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="OpenAIResponseAgentThread"/> class that resumes an existing response.
    /// </summary>
    /// <param name="client">The agents client to use for interacting with responses.</param>
    /// <param name="responseId">The ID of an existing response to resume.</param>
    public OpenAIResponseAgentThread(OpenAIResponseClient client, string responseId)
    {
        Verify.NotNull(client);
        Verify.NotNull(responseId);

        this._client = client;
        this.ResponseId = responseId;
    }

    /// <summary>
    /// The current response id.
    /// </summary>
    internal string? ResponseId { get; set; }

    /// <inheritdoc />
    public override string? Id => this.ResponseId;

    /// <inheritdoc />
    protected override Task<string?> CreateInternalAsync(CancellationToken cancellationToken = default)
    {
        if (this._isDeleted)
        {
            throw new InvalidOperationException("This thread has been deleted and cannot be recreated.");
        }

        // Id will not be available until after a message is sent