MCPInstall

ilspy-decompile

by aarononthewebBackend & APIs

Understand implementation details of .NET code by decompiling assemblies. Use when you want to see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries.

Installs
611
Last 24h
+9
Trending rank
#9109
Security
Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/aaronontheweb/dotnet-skills --skill ilspy-decompile
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads ilspy-decompile automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

.NET Assembly Decompilation with ILSpy

Use this skill to understand how .NET code works internally by decompiling compiled assemblies.

Prerequisites

  • .NET SDK installed
  • ILSpy command-line tool available via one of the following:
    • dnx ilspycmd (if available in your SDK or runtime)
    • dotnet tool install --global ilspycmd

Both forms are shown below. Use the one that works in your environment.

Note: ILSpyCmd options may vary slightly by version.
Always verify supported flags with ilspycmd -h.

Quick start

# Decompile an assembly to stdout
ilspycmd MyLibrary.dll
# or
dnx ilspycmd MyLibrary.dll

# Decompile to an output folder
ilspycmd -o output-folder MyLibrary.dll

Common .NET Assembly Locations

NuGet packages

~/.nuget/packages/<package-name>/<version>/lib/<tfm>/

.NET runtime libraries

dotnet --list-runtimes

.NET SDK reference assemblies

dotnet --list-sdks

Reference assemblies do not contain implementations.

Project build output

./bin/Debug/net8.0/<AssemblyName>.dll
./bin/Release/net8.0/publish/<AssemblyName>.dll

Core workflow

  1. Identify what you want to understand
  2. Locate the assembly
  3. List types
  4. Decompile the target

Commands

Basic decompilation

ilspycmd MyLibrary.dll
ilspycmd -o ./decompiled MyLibrary.dll
ilspycmd -p -o ./project MyLibrary.dll

Targeted decompilation

ilspycmd -t Namespace.ClassName MyLibrary.dll
ilspycmd -lv CSharp12_0 MyLibrary.dll

View IL code

ilspycmd -il MyLibrary.dll

Notes on modern .NET builds

  • ReadyToRun images may reduce readability
  • Trimmed or AOT builds may omit code
  • Prefer non-trimmed builds

Legal note

Decompiling assemblies may be subject to license restrictions.

FAQ

What does the ilspy-decompile skill do?

Understand implementation details of .NET code by decompiling assemblies. Use when you want to see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries.

How do I install ilspy-decompile?

Run npx skills add https://github.com/aaronontheweb/dotnet-skills --skill ilspy-decompile in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/ilspy-decompile/ (personal) or .claude/skills/ilspy-decompile/ (project).

Which AI agents can use ilspy-decompile?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is ilspy-decompile safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains ilspy-decompile?

It is published by aaronontheweb in aaronontheweb/dotnet-skills. It has 611 recorded installs.

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