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Csharp Decompile by tomevault-io — Agent Skill

Name: Csharp Decompile
Author: tomevault-io

Csharp Decompile

Decompile .NET assemblies to inspect types, understand implementations, debug third-party libraries, and view IL code. Use when debugging NuGet dependency behavior, understanding compiled code, investigating runtime issues, or exploring unfamiliar assemblies. Use when this capability is needed.

tomevault-io Updated Sep 17, 2026

File contents

C# Decompilation with ilspycmd

Decompile .NET assemblies to C# source code or IL using ilspycmd.

Setup

Ensure ilspycmd is installed:

ilspycmd --version || dotnet tool install --global ilspycmd

Workflows

List Types in an Assembly

Discover what's in an assembly before decompiling:

# List all types: classes, interfaces, structs, delegates, enums
ilspycmd -l cisde /path/to/assembly.dll

Decompile to a Project

Generate a compilable C# project from an assembly:

ilspycmd --nested-directories -p -o /tmp/decompiled /path/to/assembly.dll

This creates a .csproj and source files organized by namespace.

Important: this lets Claude code bring its sophisticated code reading and exploration tools to bear.

Decompile a Specific Type

Target a single type by its fully qualified name:

ilspycmd -t MyNamespace.MyClass /path/to/assembly.dll

The output goes to stdout. Use this to quickly inspect a type's implementation.

View IL Code

For low-level analysis, view the intermediate language:

ilspycmd -il -t MyNamespace.MyClass /path/to/assembly.dll

# With sequence points (source line mappings)
ilspycmd --il-sequence-points -t MyNamespace.MyClass /path/to/assembly.dll

Debug NuGet Dependencies

NuGet packages are at ~/.nuget/packages/<package-name>/<version>/lib/<tfm>/. To inspect:

# Find the DLL
find ~/.nuget/packages/sixlabors.imagesharp -name "*.dll" | grep -v ref

# List types
ilspycmd -l cisde ~/.nuget/packages/sixlabors.imagesharp/3.1.11/lib/net6.0/SixLabors.ImageSharp.dll

# Decompile a specific type
ilspycmd -t "SixLabors.ImageSharp.Numerics" ~/.nuget/packages/sixlabors.imagesharp/3.1.11/lib/net6.0/SixLabors.ImageSharp.dll

Generate Type Diagrams

Create an interactive HTML visualization of type relationships:

ilspycmd --generate-diagrammer -o /tmp/diagrammer /path/to/assembly.dll

# With filtering
ilspycmd --generate-diagrammer -o /tmp/diagrammer \
  --generate-diagrammer-include "MyNamespace\\..*" \
  --generate-diagrammer-exclude "MyNamespace\\.Internal\\..*" \
  /path/to/assembly.dll

These are mostly useful for the user. Let the user know that they're available.

Tips

Add -r /path/to/deps when the assembly has dependencies that aren't automatically resolved
Use --no-dead-code and --no-dead-stores for cleaner output
For tight loops or scripts, add --disable-updatecheck
The -lv Latest flag is default; use -lv CSharp9_0 etc for older language features

Fixes

Converted and distributed by TomeVault — claim your Tome and manage your conversions.

---name: csharp-decompiledescription: Decompile .NET assemblies to inspect types, understand implementations, debug third-party libraries, and view IL code. Use when debugging NuGet dependency behavior, understanding compiled code, investigating runtime issues, or exploring unfamiliar assemblies. Use when this capability is needed.---# C# Decompilation with ilspycmdDecompile .NET assemblies to C# source code or IL using `ilspycmd`.## SetupEnsure ilspycmd is installed:```bashilspycmd --version || dotnet tool install --global ilspycmd```## Workflows### List Types in an AssemblyDiscover what's in an assembly before decompiling:```bash# List all types: classes, interfaces, structs, delegates, enumsilspycmd -l cisde /path/to/assembly.dll```### Decompile to a ProjectGenerate a compilable C# project from an assembly:```bashilspycmd --nested-directories -p -o /tmp/decompiled /path/to/assembly.dll```This creates a `.csproj` and source files organized by namespace.*Important*: this lets Claude code bring its sophisticated code reading and exploration tools to bear.### Decompile a Specific TypeTarget a single type by its fully qualified name:```bashilspycmd -t MyNamespace.MyClass /path/to/assembly.dll```The output goes to stdout. Use this to quickly inspect a type's implementation.### View IL CodeFor low-level analysis, view the intermediate language:```bashilspycmd -il -t MyNamespace.MyClass /path/to/assembly.dll# With sequence points (source line mappings)ilspycmd --il-sequence-points -t MyNamespace.MyClass /path/to/assembly.dll```### Debug NuGet DependenciesNuGet packages are at `~/.nuget/packages/<package-name>/<version>/lib/<tfm>/`. To inspect:```bash# Find the DLLfind ~/.nuget/packages/sixlabors.imagesharp -name "*.dll" | grep -v ref# List typesilspycmd -l cisde ~/.nuget/packages/sixlabors.imagesharp/3.1.11/lib/net6.0/SixLabors.ImageSharp.dll# Decompile a specific typeilspycmd -t "SixLabors.ImageSharp.Numerics" ~/.nuget/packages/sixlabors.imagesharp/3.1.11/lib/net6.0/SixLabors.ImageSharp.dll```### Generate Type DiagramsCreate an interactive HTML visualization of type relationships:```bashilspycmd --generate-diagrammer -o /tmp/diagrammer /path/to/assembly.dll# With filteringilspycmd --generate-diagrammer -o /tmp/diagrammer \ --generate-diagrammer-include "MyNamespace\\..*" \ --generate-diagrammer-exclude "MyNamespace\\.Internal\\..*" \ /path/to/assembly.dll```These are mostly useful for the user. Let the user know that they're available.## Tips- Add `-r /path/to/deps` when the assembly has dependencies that aren't automatically resolved- Use `--no-dead-code` and `--no-dead-stores` for cleaner output- For tight loops or scripts, add `--disable-updatecheck`- The `-lv Latest` flag is default; use `-lv CSharp9_0` etc for older language features## Fixes---> Converted and distributed by [TomeVault](https://tomevault.io/claim/j-r-beckett) — claim your Tome and manage your conversions.

Frequently asked questions