CrissCross.MCP.Server

C# stdio MCP server for developers and coding agents working with the ReactiveMarbles CrissCross package family.

The server keeps MCP transport thin and exposes deterministic, source-backed knowledge from the CrissCross repository through tools, resources, and prompts. It does not modify the CrissCross source repository.

The server is implemented in C# on net10.0 using ModelContextProtocol 1.3.0.

Quick Install

Click to install in your preferred environment:

Note:

• These install links are prepared for the NuGet package identity CrissCross.Mcp.Server.
• If the latest package has not been published yet, use the manual source-build configuration below.

Manual MCP configuration using NuGet:

{
  "mcpServers": {
    "crisscross-mcp-server": {
      "type": "stdio",
      "command": "dnx",
      "args": [
        "CrissCross.Mcp.Server@0.*",
        "--yes"
      ]
    }
  }
}

Requirements

• .NET 10 SDK
• An MCP-capable client such as VS Code, Visual Studio, Claude Desktop, or any MCP 1.x host
• Node/npm only for optional MCP discovery probing with mcporter.

Build and test

Run from the repository root:

DOTNET="/mnt/c/Program Files/dotnet/dotnet.exe"
"$DOTNET" restore CrissCross.MCP.Server.slnx
"$DOTNET" build CrissCross.MCP.Server.slnx -c Release --no-restore -warnaserror
"$DOTNET" test --project tests/CrissCross.McpServer.Tests/CrissCross.McpServer.Tests.csproj -c Release

Run as an MCP stdio server

Stdout is reserved for MCP JSON-RPC. All diagnostics are routed to stderr by Microsoft.Extensions.Logging.Console with LogToStandardErrorThreshold = Trace.

"/mnt/c/Program Files/dotnet/dotnet.exe" "$(wslpath -w "$PWD/src/CrissCross.McpServer/bin/Release/net10.0/CrissCross.McpServer.dll")"

Convenience wrapper:

scripts/run-crisscross-mcp.sh

MCP discovery probe:

npm_config_cache="$PWD/.npm-cache" npx -y mcporter list --stdio "$PWD/scripts/run-crisscross-mcp.sh" --name crisscross

Manual source configuration

{
  "mcpServers": {
    "crisscross-mcp-server": {
      "type": "stdio",
      "command": "dotnet",
      "args": [
        "run",
        "--project",
        "/path/to/CrissCross.MCP.Server/src/CrissCross.McpServer/CrissCross.McpServer.csproj"
      ]
    }
  }
}

Tools

• crisscross_get_package_matrix(platform?, targetFramework?)
• crisscross_get_startup_recipe(platform, uiMode?)
• crisscross_get_navigation_recipe(kind, platform?, hostName?, contract?)
• crisscross_find_control(platform, nameOrFeature)
• crisscross_generate_viewmodel(feature, className, namespace, navigationMode?)
• crisscross_generate_navigation_registry(mappingSpec)
• `crisscross_review_code_snippet(code, platform?,

... View full README on GitHub