Excel MCP Server (uses Excel App, 100% Compatibility)

using System.IO.Pipes; using System.Security.Principal; namespace Sbroenne.ExcelMcp.ComInterop.ServiceClient; /// <summary> /// Security utilities for ExcelMCP Service named pipe communication (client-side). /// Provides pipe name generation and client connection creation. /// </summary> public static class ServiceSecurity { private static readonly string UserSid = WindowsIdentity.GetCurrent().User?.Value ?? "default"; /// <summary> /// Gets the pipe name for the MCP Server (per-process isolation). /// </summary> public static string GetMcpPipeName() => $"excelmcp-mcp-{UserSid}-{Environment.ProcessId}"; /// <summary> /// Gets the pipe name for the CLI daemon (shared across CLI invocations for the same user). /// </summary> public static string GetCliPipeName() => $"excelmcp-cli-{UserSid}"; /// <summary> /// Creates a client connection to a service pipe. /// </summary> public static NamedPipeClientStream CreateClient(string pipeName) { return new NamedPipeClientStream( ".", pipeName, PipeDirection.InOut, PipeOptions.Asynchronous); } }