Samples for quickstart docs (#104)

* Server quickstart for docs

* WIP

* Client quickstart for docs

* Code review feedback

* Fixing anthropic SDK and improving the prompting

* Little cleanup

* Code review feedback

samples/QuickstartClient/Program.cs

@@ -0,0 +1,98 @@
+using Anthropic.SDK;
+using Microsoft.Extensions.AI;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using ModelContextProtocol.Client;
+using ModelContextProtocol.Protocol.Transport;
+
+var builder = Host.CreateEmptyApplicationBuilder(settings: null);
+
+builder.Configuration
+    .AddEnvironmentVariables()
+    .AddUserSecrets<Program>();
+
+var (command, arguments) = GetCommandAndArguments(args);
+
+await using var mcpClient = await McpClientFactory.CreateAsync(new()
+{
+    Id = "demo-server",
+    Name = "Demo Server",
+    TransportType = TransportTypes.StdIo,
+    TransportOptions = new()
+    {
+        ["command"] = command,
+        ["arguments"] = arguments,
+    }
+});
+
+var tools = await mcpClient.ListToolsAsync();
+foreach (var tool in tools)
+{
+    Console.WriteLine($"Connected to server with tools: {tool.Name}");
+}
+
+using var anthropicClient = new AnthropicClient(new APIAuthentication(builder.Configuration["ANTHROPIC_API_KEY"]))
+    .Messages
+    .AsBuilder()
+    .UseFunctionInvocation()
+    .Build();
+
+var options = new ChatOptions
+{
+    MaxOutputTokens = 1000,
+    ModelId = "claude-3-5-sonnet-20241022",
+    Tools = [.. tools]
+};
+
+Console.ForegroundColor = ConsoleColor.Green;
+Console.WriteLine("MCP Client Started!");
+Console.ResetColor();
+
+PromptForInput();
+while(Console.ReadLine() is string query && !"exit".Equals(query, StringComparison.OrdinalIgnoreCase))
+{
+    if (string.IsNullOrWhiteSpace(query))
+    {
+        PromptForInput();
+        continue;
+    }
+
+    await foreach (var message in anthropicClient.GetStreamingResponseAsync(query, options))
+    {
+        Console.Write(message);
+    }
+    Console.WriteLine();
+
+    PromptForInput();
+}
+
+static void PromptForInput()
+{
+    Console.WriteLine("Enter a command (or 'exit' to quit):");
+    Console.ForegroundColor = ConsoleColor.Cyan;
+    Console.Write("> ");
+    Console.ResetColor();
+}
+
+/// <summary>
+/// Determines the command (executable) to run and the script/path to pass to it. This allows different
+/// languages/runtime environments to be used as the MCP server.
+/// </summary>
+/// <remarks>
+/// This method uses the file extension of the first argument to determine the command, if it's py, it'll run python,
+/// if it's js, it'll run node, if it's a directory or a csproj file, it'll run dotnet.
+/// 
+/// If no arguments are provided, it defaults to running the QuickstartWeatherServer project from the current repo.
+/// 
+/// This method would only be required if you're creating a generic client, such as we use for the quickstart.
+/// </remarks>
+static (string command, string arguments) GetCommandAndArguments(string[] args)
+{
+    return args switch
+    {
+        [var script] when script.EndsWith(".py") => ("python", script),
+        [var script] when script.EndsWith(".js") => ("node", script),
+        [var script] when Directory.Exists(script) || (File.Exists(script) && script.EndsWith(".csproj")) => ("dotnet", $"run --project {script} --no-build"),
+        _ => ("dotnet", "run --project ../../../../QuickstartWeatherServer --no-build")
+    };
+}

samples/QuickstartClient/QuickstartClient.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <UserSecretsId>a4e20a70-5009-4b81-b5b6-780b6d43e78e</UserSecretsId>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\ModelContextProtocol\ModelContextProtocol.csproj" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Anthropic.SDK" />
+        <PackageReference Include="Microsoft.Extensions.Hosting" />
+    </ItemGroup>
+
+</Project>