james-world · December 17, 2025 13:26 · james-world · Dec 17, 2025
diff --git a/codingagent.cs b/codingagent.cs
 #!/usr/local/share/dotnet/dotnet run
 #:package Microsoft.Agents.AI.OpenAI@1.0.0-preview.251113.1
 #:package OpenAI@2.7.0

 using OpenAI;
 using Microsoft.Extensions.AI;
 using System.ComponentModel;
 using static System.Console;

 var openAIKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY");
 var model = "gpt-4o-mini";
 var openAIClient = new OpenAIClient(openAIKey);
 var agent = openAIClient
    .GetChatClient(model)
    .CreateAIAgent(
        instructions: "You are a helpful coding assistant.",
        tools:
        [
            AIFunctionFactory.Create(ReadFile),
            AIFunctionFactory.Create(ListFiles),
            AIFunctionFactory.Create(EditFile)
        ]
    );

 WriteLine("Chat with OpenAI Agent (Ctrl-C to quit)");

 var thread = agent.GetNewThread();

 while (true)
 {
    ForegroundColor = ConsoleColor.Blue;
    Write("You: ");
    ResetColor();

    var user = ReadLine();
    if (string.IsNullOrWhiteSpace(user)) break;

    try
    {
        var result = await agent.RunAsync(user, thread);
        ForegroundColor = ConsoleColor.Green;
        WriteLine(result?.ToString() ?? string.Empty);
    }
    catch (Exception ex)
    {
        ForegroundColor = ConsoleColor.Red;
        WriteLine($"Error: {ex.Message}");
    }
    finally
    {
        ResetColor();
    }
 }

 [Description("Read the contents of a given relative file path. Use this when you want to see what's inside a file. Do not use this with directory names.")]
 static string ReadFile(
    [Description("The relative path of a file in the working directory.")] string path)
 {
    if (string.IsNullOrWhiteSpace(path)) throw new ArgumentException("path required");
    return File.ReadAllText(path);
 }

 [Description("List the files and directories at a given path. If no path is provided, list the files in the current directory.")]
 static string ListFiles(
    [Description("Optional relative path to list files from. Defaults to current directory if not provided.")] string? path = null)
 {
    var dir = string.IsNullOrWhiteSpace(path) ? "." : path;
    if (!Directory.Exists(dir)) throw new DirectoryNotFoundException(dir);
    var entries = Directory.EnumerateFileSystemEntries(dir)
        .Select(e => Path.GetFileName(e) + (Directory.Exists(e) ? "/" : ""));
    return "[" + string.Join(", ", entries) + "]";
 }

 [Description("Make edits to a text file. Replaces old_str with new_str in the given file. If file doesn't exist and old_str is empty, creates file with new_str.")]
 static string EditFile(
    [Description("The path to the file.")] string path,
    [Description("Text to search for - must match exactly.")] string old_str,
    [Description("Text to replace old_str with.")] string new_str)
 {
    if (string.IsNullOrWhiteSpace(path) || old_str == new_str)
        throw new ArgumentException("invalid input parameters");
    if (!File.Exists(path))
    {
        if (string.IsNullOrEmpty(old_str))
        {
            var dir = Path.GetDirectoryName(path);
            if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
            File.WriteAllText(path, new_str);
            return $"Successfully created file {path}";
        }
        throw new FileNotFoundException(path);
    }
    var content = File.ReadAllText(path);
    var replaced = content.Replace(old_str, new_str);
    if (replaced == content && old_str != string.Empty)
        throw new InvalidOperationException("old_str not found in file");
    File.WriteAllText(path, replaced);
    return "OK";
 }
	#!/usr/local/share/dotnet/dotnet run
	#:package Microsoft.Agents.AI.OpenAI@1.0.0-preview.251113.1
	#:package OpenAI@2.7.0

	using OpenAI;
	using Microsoft.Extensions.AI;
	using System.ComponentModel;
	using static System.Console;

	var openAIKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY");
	var model = "gpt-4o-mini";
	var openAIClient = new OpenAIClient(openAIKey);
	var agent = openAIClient
	.GetChatClient(model)
	.CreateAIAgent(
	instructions: "You are a helpful coding assistant.",
	tools:
	[
	AIFunctionFactory.Create(ReadFile),
	AIFunctionFactory.Create(ListFiles),
	AIFunctionFactory.Create(EditFile)
	]
	);

	WriteLine("Chat with OpenAI Agent (Ctrl-C to quit)");

	var thread = agent.GetNewThread();

	while (true)
	{
	ForegroundColor = ConsoleColor.Blue;
	Write("You: ");
	ResetColor();

	var user = ReadLine();
	if (string.IsNullOrWhiteSpace(user)) break;

	try
	{
	var result = await agent.RunAsync(user, thread);
	ForegroundColor = ConsoleColor.Green;
	WriteLine(result?.ToString() ?? string.Empty);
	}
	catch (Exception ex)
	{
	ForegroundColor = ConsoleColor.Red;
	WriteLine($"Error: {ex.Message}");
	}
	finally
	{
	ResetColor();
	}
	}

	[Description("Read the contents of a given relative file path. Use this when you want to see what's inside a file. Do not use this with directory names.")]
	static string ReadFile(
	[Description("The relative path of a file in the working directory.")] string path)
	{
	if (string.IsNullOrWhiteSpace(path)) throw new ArgumentException("path required");
	return File.ReadAllText(path);
	}

	[Description("List the files and directories at a given path. If no path is provided, list the files in the current directory.")]
	static string ListFiles(
	[Description("Optional relative path to list files from. Defaults to current directory if not provided.")] string? path = null)
	{
	var dir = string.IsNullOrWhiteSpace(path) ? "." : path;
	if (!Directory.Exists(dir)) throw new DirectoryNotFoundException(dir);
	var entries = Directory.EnumerateFileSystemEntries(dir)
	.Select(e => Path.GetFileName(e) + (Directory.Exists(e) ? "/" : ""));
	return "[" + string.Join(", ", entries) + "]";
	}

	[Description("Make edits to a text file. Replaces old_str with new_str in the given file. If file doesn't exist and old_str is empty, creates file with new_str.")]
	static string EditFile(
	[Description("The path to the file.")] string path,
	[Description("Text to search for - must match exactly.")] string old_str,
	[Description("Text to replace old_str with.")] string new_str)
	{
	if (string.IsNullOrWhiteSpace(path) \|\| old_str == new_str)
	throw new ArgumentException("invalid input parameters");
	if (!File.Exists(path))
	{
	if (string.IsNullOrEmpty(old_str))
	{
	var dir = Path.GetDirectoryName(path);
	if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
	File.WriteAllText(path, new_str);
	return $"Successfully created file {path}";
	}
	throw new FileNotFoundException(path);
	}
	var content = File.ReadAllText(path);
	var replaced = content.Replace(old_str, new_str);
	if (replaced == content && old_str != string.Empty)
	throw new InvalidOperationException("old_str not found in file");
	File.WriteAllText(path, replaced);
	return "OK";
	}
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