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Is Ilspy Decompile free to use?

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Who published Ilspy Decompile?

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

Ilspy Decompile by nikiforovall — Agent Skill

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

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.

NikiforovAll 57d1bbc 2 files · 4.9 KB Updated Sep 10, 2026

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:
- dotnet 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
dotnet 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 to find the target
Decompile the target

Commands

List types in an assembly

Use -l with an entity type to discover what's inside:

# List classes
ilspycmd -l c MyLibrary.dll

# List interfaces
ilspycmd -l i MyLibrary.dll

# List structs, delegates, enums
ilspycmd -l s MyLibrary.dll
ilspycmd -l d MyLibrary.dll
ilspycmd -l e MyLibrary.dll

Basic decompilation

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

Targeted decompilation

# Decompile specific type
ilspycmd -t Namespace.ClassName MyLibrary.dll

# Specify C# language version (default: Latest)
ilspycmd -lv CSharp12_0 MyLibrary.dll

View IL code

ilspycmd -il MyLibrary.dll

Clean output

# Remove dead code and dead stores for cleaner results
ilspycmd --no-dead-code --no-dead-stores MyLibrary.dll

Organized project output

# Decompile with nested directories matching namespaces
ilspycmd --nested-directories -p -o ./decompiled MyLibrary.dll

References

references/diagrammer.md — Generate interactive HTML diagrams from assemblies. Load when the user asks to visualize or explore type relationships.

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: - `dotnet 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# ordotnet dnx 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 types to find the target4. Decompile the target## Commands### List types in an assemblyUse `-l` with an entity type to discover what's inside:```bash# List classesilspycmd -l c MyLibrary.dll# List interfacesilspycmd -l i MyLibrary.dll# List structs, delegates, enumsilspycmd -l s MyLibrary.dllilspycmd -l d MyLibrary.dllilspycmd -l e MyLibrary.dll```### Basic decompilation```bashilspycmd MyLibrary.dllilspycmd -o ./decompiled MyLibrary.dllilspycmd -p -o ./project MyLibrary.dll```### Targeted decompilation```bash# Decompile specific typeilspycmd -t Namespace.ClassName MyLibrary.dll# Specify C# language version (default: Latest)ilspycmd -lv CSharp12_0 MyLibrary.dll```### View IL code```bashilspycmd -il MyLibrary.dll```### Clean output```bash# Remove dead code and dead stores for cleaner resultsilspycmd --no-dead-code --no-dead-stores MyLibrary.dll```### Organized project output```bash# Decompile with nested directories matching namespacesilspycmd --nested-directories -p -o ./decompiled MyLibrary.dll```## References- **references/diagrammer.md** — Generate interactive HTML diagrams from assemblies. Load when the user asks to visualize or explore type relationships.## 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