How do I install the Ilspy Decompile skill?

Run npx skillmds@latest add aaronontheweb/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?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Ilspy Decompile free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Ilspy Decompile?

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

Ilspy Decompile by aaronontheweb — Agent Skill

Name: Ilspy Decompile
Rating: 4.666666666666667 (3 reviews)
Author: aaronontheweb

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.

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 ILSpyUse 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 stdoutilspycmd MyLibrary.dll# ordnx ilspycmd MyLibrary.dll# Decompile to an output folderilspycmd -o output-folder MyLibrary.dll```## Common .NET Assembly Locations### NuGet packages```bash~/.nuget/packages/<package-name>/<version>/lib/<tfm>/```### .NET runtime libraries```bashdotnet --list-runtimes```### .NET SDK reference assemblies```bashdotnet --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 workflow1. Identify what you want to understand2. Locate the assembly3. List types4. Decompile the target## Commands### Basic decompilation```bashilspycmd MyLibrary.dllilspycmd -o ./decompiled MyLibrary.dllilspycmd -p -o ./project MyLibrary.dll```### Targeted decompilation```bashilspycmd -t Namespace.ClassName MyLibrary.dllilspycmd -lv CSharp12_0 MyLibrary.dll```### View IL code```bashilspycmd -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 noteDecompiling assemblies may be subject to license restrictions.

Frequently asked questions