Linux-related stdio fixes and update version (#22)

- Modified `GetCommand` to return OS-specific commands and changed return type to `string?`.
- Improved `InitializeCommand` for better command initialization and logging.
- Cleaned up using directives in `Log.cs` and `SseClientTransport.cs`.
- Updated `CreateNoWindow` property in `StdioClientTransport` to be OS-dependent.
- Bumped version number in `mcpdotnet.csproj` to 1.0.1.1.

README.MD

@@ -166,7 +166,6 @@ while (true)
 - Performance optimization
 - SSE server support
 - Authentication
-- Linux/Mac support for stdio transport
 
 ## License
 

src/mcpdotnet/Client/McpClientFactory.cs

@@ -135,7 +135,7 @@ public class McpClientFactory
         return defaultValue;
     }
 
-    private string GetCommand(McpServerConfig config)
+    private string? GetCommand(McpServerConfig config)
     {
         if (config.TransportOptions == null ||
             string.IsNullOrEmpty(config.TransportOptions.GetValueOrDefault("command")))
@@ -143,7 +143,7 @@ public class McpClientFactory
             return config.Location!;
         }
 
-        return $"cmd.exe";
+        return OperatingSystem.IsWindows() ? "cmd.exe" : config.TransportOptions?.GetValueOrDefault("command");
     }
 
     /// <summary>
@@ -151,29 +151,28 @@ public class McpClientFactory
     /// </summary>
     private void InitializeCommand(McpServerConfig config)
     {
-
         string endpointName = $"Client ({config.Id}: {config.Name})";
 
         // If the command is empty or already contains cmd.exe, we don't need to do anything
         var command = config.TransportOptions?.GetValueOrDefault("command");
-        if (string.IsNullOrEmpty(command))
+
+        if (string.IsNullOrEmpty(command) || !OperatingSystem.IsWindows())
         {
             return;
         }
 
-        if (command.Contains("cmd.exe"))
+        // On Windows, we need to wrap non-shell commands with cmd.exe /c
+        if (command.ToLowerInvariant().Contains("cmd.exe"))
         {
             _logger.SkippingShellWrapper(endpointName);
             return;
         }
 
-        // If the command is not empty and does not contain cmd.exe, we need to inject /c {command}
-        if (config.TransportOptions != null && !string.IsNullOrEmpty(command))
-        {
-            _logger.PromotingCommandToShellArgumentForStdio(endpointName, command, config.TransportOptions.GetValueOrDefault("arguments") ?? "");
-            config.TransportOptions["arguments"] = config.TransportOptions.ContainsKey("arguments")
-                ? $"/c {command} {config.TransportOptions["arguments"]}"
-                : $"/c {command}";
-        }
+        // If the command is not empty and does not contain cmd.exe, we need to inject /c {command} (usually npx or uvicorn)
+        // This is because the stdio transport will not work correctly if the command is not run in a shell
+        _logger.PromotingCommandToShellArgumentForStdio(endpointName, command, config.TransportOptions!.GetValueOrDefault("arguments") ?? "");
+        config.TransportOptions!["arguments"] = config.TransportOptions.ContainsKey("arguments")
+            ? $"/c {command} {config.TransportOptions["arguments"]}"
+            : $"/c {command}";
     }
 }

src/mcpdotnet/Logging/Log.cs

@@ -1,5 +1,4 @@
-using McpDotNet.Configuration;
-using McpDotNet.Protocol.Messages;
+using McpDotNet.Protocol.Messages;
 using Microsoft.Extensions.Logging;
 
 namespace McpDotNet.Logging;

src/mcpdotnet/Protocol/Transport/SseClientTransport.cs

@@ -1,6 +1,4 @@
-
-using System.Diagnostics.Tracing;
-using System.Text.Json;
+using System.Text.Json;
 using System.Text;
 using McpDotNet.Protocol.Messages;
 using McpDotNet.Configuration;
@@ -9,7 +7,6 @@ using McpDotNet.Logging;
 using System.Net.Http.Headers;
 using System.Text.Json.Serialization;
 using McpDotNet.Utils.Json;
-using System.Threading;
 
 namespace McpDotNet.Protocol.Transport;
 

src/mcpdotnet/Protocol/Transport/StdioClientTransport.cs

@@ -61,7 +61,7 @@ public sealed class StdioClientTransport : TransportBase, IClientTransport
                 RedirectStandardInput = true,
                 RedirectStandardOutput = true,
                 RedirectStandardError = true,
-                CreateNoWindow = true,
+                CreateNoWindow = OperatingSystem.IsWindows(),
                 WorkingDirectory = _options.WorkingDirectory ?? Environment.CurrentDirectory,
             };
 

src/mcpdotnet/mcpdotnet.csproj

@@ -9,7 +9,7 @@
   <PropertyGroup>
     <!-- license and package properties -->
     <PackageId>mcpdotnet</PackageId>
-    <Version>1.0.0.1</Version>
+    <Version>1.0.1.1</Version>
     <Authors>PederHP</Authors>
     <Description>.NET client library for the Model Context Protocol (MCP)</Description>
     <PackageProjectUrl>https://github.com/PederHP/mcpdotnet</PackageProjectUrl>