@iffrce/mcp-dotnetdc

MCP .NET Decompiler Server (mcp-dotnetdc)

A Model Context Protocol (MCP) server that decompiles .NET assemblies (.dll/.exe) using ILSpy's command-line tool (ilspycmd). Returns decompiled source code via MCP stdio.

Features

• Decompile entire .NET assemblies
• Target a specific type via fully qualified name
• Output language selectable (e.g., CSharp or IL) depending on ilspycmd support
• Clean temp directory management
• MCP stdio transport

Prerequisites

• Node.js 16+
• .NET SDK
• ilspycmd (global tool)
  • Install: dotnet tool install -g ilspycmd

Run

从源码运行

npm install
npm start

作为 MCP 服务器

Use any MCP client and point it to run this server. Example with MCP Inspector:

npx @modelcontextprotocol/inspector node ./index.js

### 通过 npx 直接运行

无需克隆仓库，可直接使用 npx 执行（将自动下载本包并以 stdio 模式启动 MCP 服务器）：

```bash
npx -y @iffrce/mcp-dotnetdc

在 MCP 客户端中配置命令为：

{
  "command": "npx",
  "args": ["-y", "@iffrce/mcp-dotnetdc"]
}

## MCP Tools

### decompile-dotnet-assembly

- `assemblyPath` (required): Absolute path to .dll or .exe
- `typeName` (optional): Fully qualified type name (e.g., `Namespace.TypeName`)
- `language` (optional): Output language, e.g., `CSharp` or `IL`

Example request:

```json
{
  "jsonrpc": "2.0",
  "id": "1",
  "method": "mcp.tool.execute",
  "params": {
    "tool": "decompile-dotnet-assembly",
    "args": {
      "assemblyPath": "/absolute/path/to/App.dll",
      "typeName": "MyCompany.Product.Foo",
      "language": "CSharp"
    }
  }
}

Notes

• Requires ilspycmd on PATH. If missing, the server returns guidance on installing it.
• Output concatenates all produced .cs/.il files with headers indicating relative file paths.

License

ISC