Ilspy Decompile

What it does

This skill enables AI agents to decompile .NET assemblies using ILSpy, converting compiled binaries back into readable Intermediate Language (IL) code. It allows for the inspection of internal logic within closed-source or obfuscated applications without requiring access to the original source files.

When to use it

• Analyzing legacy .NET applications where source code is unavailable but behavior needs understanding.
• Debugging runtime errors by examining the actual IL instructions executed during a crash.
• Investigating security vulnerabilities in third-party libraries by reviewing their compiled logic.
• Extracting algorithmic details from proprietary software for educational or reverse-engineering purposes.

Key capabilities

• Executes decompilation of .NET assemblies into human-readable IL code.
• Integrates with the ILSpy engine to parse binary structures.
• Outputs structured text representing method bodies and control flow.

Example prompts

• "Use ilspy-decompile to analyze System.dll and show me the IL implementation of String.Concat."
• "Decompile the attached MyApp.exe file and summarize the logic inside the Main method."
• "Run ilspy-decompile on this assembly and list all public methods that interact with database connections."

Tips & gotchas

Ensure you have valid .NET assemblies to process, as decompiling invalid or corrupted binaries may result in errors. While ILSpy provides high-quality output, the resulting code is an approximation of the original source and should not be treated as a perfect 1:1 replacement for human-written C# or VB.NET.