How do I install the Ilspy Decompile skill?

Run npx skillmds@latest add majiayu000/ilspy-decompile in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Which AI agents work with Ilspy Decompile?

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Is Ilspy Decompile free to use?

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Who published Ilspy Decompile?

majiayu000 (@majiayu000) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Ilspy Decompile by majiayu000 — Agent Skill

Name: Ilspy Decompile
Rating: 4.2 (5 reviews)
Author: majiayu000

Ilspy Decompile

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.

majiayu000 Updated Sep 9, 2026 567 repo stars

File contents

.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

Identify what you want to understand
Locate the assembly
List types
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.

---name: ilspy-decompiledescription: 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.--- # .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 ```bash # 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 ```bash ~/.nuget/packages/<package-name>/<version>/lib/<tfm>/ ``` ### .NET runtime libraries ```bash dotnet --list-runtimes ``` ### .NET SDK reference assemblies ```bash dotnet --list-sdks ``` > Reference assemblies do not contain implementations. ### Project build output ```bash ./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 ```bash ilspycmd MyLibrary.dll ilspycmd -o ./decompiled MyLibrary.dll ilspycmd -p -o ./project MyLibrary.dll ``` ### Targeted decompilation ```bash ilspycmd -t Namespace.ClassName MyLibrary.dll ilspycmd -lv CSharp12_0 MyLibrary.dll ``` ### View IL code ```bash 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.

Frequently asked questions