RoslynCodeGraph.Mcp 0.0.9

Roslyn Code Graph MCP Server

A Roslyn-based MCP server that provides semantic code intelligence for .NET codebases. Designed for use with Claude Code to understand type hierarchies, call sites, DI registrations, and reflection usage.

Features

• find_implementations — Find all classes/structs implementing an interface or extending a class
• find_callers — Find every call site for a method, property, or constructor
• get_type_hierarchy — Walk base classes, interfaces, and derived types
• get_di_registrations — Scan for DI service registrations
• get_project_dependencies — Get the project reference graph
• get_symbol_context — One-shot context dump for any type
• find_reflection_usage — Detect dynamic/reflection-based usage
• find_references — Find all references to any symbol (types, methods, properties, fields, events)
• go_to_definition — Find the source file and line where a symbol is defined
• get_diagnostics — List compiler errors, warnings, and Roslyn analyzer diagnostics
• get_code_fixes — Get available code fixes with structured text edits for any diagnostic
• search_symbols — Fuzzy workspace symbol search by name
• get_nuget_dependencies — List NuGet package references per project
• find_attribute_usages — Find types and members decorated with a specific attribute
• find_circular_dependencies — Detect cycles in project or namespace dependency graphs
• get_complexity_metrics — Cyclomatic complexity analysis per method
• find_naming_violations — Check .NET naming convention compliance
• find_large_classes — Find oversized types by member or line count
• find_unused_symbols — Dead code detection via reference analysis

Installation

As a Claude Code Plugin

claude install gh:MarcelRoozekrans/roslyn-codegraph-mcp

As a .NET Global Tool

dotnet tool install -g RoslynCodeGraph.Mcp

Manual MCP Configuration

Add to your Claude Code MCP settings:

{
  "mcpServers": {
    "roslyn-codegraph": {
      "command": "roslyn-codegraph-mcp",
      "args": [],
      "transport": "stdio"
    }
  }
}

Usage

The server automatically discovers .sln files by walking up from the current directory. You can also pass a solution path directly:

roslyn-codegraph-mcp /path/to/MySolution.sln

Performance

All type lookups use pre-built reverse inheritance maps, member indexes, and attribute indexes for O(1) access. Benchmarked on an i9-12900HK with .NET 10.0.3:

Requirements

• .NET 10 SDK
• A .NET solution with compilable projects

Development

dotnet build
dotnet test
dotnet run --project benchmarks/RoslynCodeGraph.Benchmarks -c Release

License

MIT