Do I need to install external tools for this skill?

Yes, you must have the .NET SDK and the 'ilspycmd' tool installed globally (via 'dotnet tool install --global ilspycmd') for Claude to perform decompilation.

Can Claude find the location of my NuGet packages automatically?

The skill includes patterns for common assembly locations, such as the global NuGet package cache and .NET runtime folders, helping Claude locate the files you need to inspect.

Does this work with modern .NET versions?

Yes, it works with modern .NET assemblies, though ReadyToRun images or heavily trimmed builds may have reduced readability.

Can I decompile a specific class instead of a whole DLL?

Yes, the skill supports targeted decompilation using the -t flag, which allows Claude to extract only the specific namespace or class you are interested in.

What is the ilspy-decompile skill?

It is a specialized capability for Claude Code that allows the AI to decompile .NET assemblies into human-readable C# code using the ILSpy command-line tool.

.NET Assembly Decompiler

Name: .NET Assembly Decompiler
Author: Aaronontheweb

byAaronontheweb

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491

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Developer Tools

Reverses .NET assemblies into readable C# source code to inspect internal logic, NuGet packages, and framework implementations.

The ilspy-decompile skill enables Claude to analyze and understand the internal workings of compiled .NET binaries. By leveraging the ILSpy command-line tool, it allows developers to peer into third-party libraries, verify build outputs, and explore the .NET runtime's implementation details. This is particularly useful for debugging 'black box' dependencies, auditing security, or learning implementation patterns from existing compiled code when source access is unavailable.

Key Features

01Decompiles .NET assemblies directly into readable C# source code

02Generates entire project structures from compiled DLLs

03Provides visibility into Intermediate Language (IL) for low-level analysis

04Assists in locating assemblies within NuGet caches and .NET runtime paths

05Supports targeted decompilation of specific namespaces and classes

06491 GitHub stars

Use Cases

01Debugging unexpected behavior in third-party NuGet packages without source code

02Understanding internal .NET framework implementation details and API logic

03Auditing compiled binaries to verify build integrity or security compliance

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add aaronontheweb/dotnet-skills ilspy-decompile

For use in Claude.ai and ChatGPT

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