ILSpy-Mcp

Overview

ILSpy MCP Server is a specialized tool that enables AI assistants to decompile and analyze .NET assemblies through natural language commands. It integrates ILSpy, a popular .NET decompiler, to provide powerful reverse-engineering capabilities directly in AI environments like Claude Code and Cursor. The server offers a comprehensive set of tools for assembly analysis, including type decompilation, method extraction, type hierarchy analysis, and member search. The implementation follows a clean architecture with clear separation of concerns, providing read-only operations with proper security measures including assembly path validation and timeout controls. It's actively maintained with recent commits and offers detailed configuration options through environment variables.

Try asking AI

After installing, here are 5 things you can ask your AI assistant:

• decompile_type

  Decompile and analyze a .NET type from a DLL

  Try:Decompile the String class from /path/to/System.Runtime.dllTry:Show me the implementation of the Calculator class
• decompile_method

  Decompile and analyze a specific method

  Try:Decompile the CalculateTotal method in /path/to/Calculator.dllTry:Show me the implementation of the ProcessData method
• list_assembly_types

  List all types in an assembly

  Try:List all types in the assembly /path/to/MyLibrary.dllTry:What classes are in this DLL?
• analyze_assembly

  Get architectural overview of an assembly

  Try:Analyze the architecture of /path/to/ECommerce.dllTry:Give me a high-level overview of this assembly
• get_type_members

  Get complete API surface of a type

  Try:Get all members of the ProductService class in /path/to/ECommerce.dllTry:Show me all public methods of the Calculator class
• find_type_hierarchy

  Find inheritance relationships

  Try:Show me the type hierarchy for ProductService in /path/to/ECommerce.dllTry:What classes does the BaseController class inherit from?
• search_members_by_name

  Search for members by name

  Try:Search for members containing 'Authenticate' in /path/to/Auth.dllTry:Find methods with 'Process' in their name
• find_extension_methods

  Find extension methods for a type

  Try:Find extension methods for the List class in /path/to/System.Core.dllTry:What extension methods are available for the String class?

Comparable tools

Installation

dotnet tool install -g ILSpyMcp.Server

dotnet tool update -g ILSpyMcp.Server

{
  "mcpServers": {
    "ilspy-mcp": {
      "command": "ilspy-mcp",
      "args": []
    }
  }
}

FAQ

What .NET versions does this support?

The server supports decompiling assemblies from various .NET versions, including .NET Framework and .NET Core/.NET 5+.

Can I decompile obfuscated assemblies?

ILSpy can handle partially obfuscated code, but heavily obfuscated assemblies may not decompile properly. Results depend on the obfuscation technique used.

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