Ilspy Decompile

What it does

When your agent uses it

• You want to see how a .NET API works internally
• Inspect NuGet package source
• View framework implementation
• Understand compiled .NET binaries

Example prompts

• “/ilspy-decompile”

Requirements

• Pre-approved tools (allowed-tools): Bash(dotnet dnx:*), Bash(ilspycmd:*)

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

1. 1Identify what you want to understand
2. 2Locate the assembly
3. 3List types to find the target
4. 4Decompile the target

What it can do on your machine

Read from SKILL.md and the folder at commit 281c063. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash(dotnet dnx:*)
  • Bash(ilspycmd:*)

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • dotnet

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Ilspy Decompile loads about 760 tokens when it runs, and up to ~1.3k if it reads all its reference files. Until then it costs about 62 tokens; SKILL.md has 200 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~62

When it runs · the whole SKILL.md, loaded when a task matches

~760

With references · SKILL.md plus every file in references/, read only if the agent opens them

~1.3k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from NikiforovAll/claude-code-rules at commit 281c063, republished under its Apache-2.0 licence (© NikiforovAll). 200 words, ~760 tokens.

name

ilspy-decompile

description

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.

allowed-tools

Bash(dotnet dnx:*), Bash(ilspycmd:*)

# 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

~/.nuget/packages/<package-name>/<version>/lib/<tfm>/

dotnet --list-runtimes

dotnet --list-sdks

./bin/Debug/net8.0/<AssemblyName>.dll
./bin/Release/net8.0/publish/<AssemblyName>.dll

# 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

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

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

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

ilspycmd -il MyLibrary.dll

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

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

© NikiforovAll, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in plugins/handbook-dotnet/skills/ilspy-decompile of NikiforovAll/claude-code-rules.

• SKILL.md
• references/diagrammer.md

Open the folder on GitHubat commit 281c063

Used in 2 other repositories

We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in NikiforovAll/claude-code-rules, which our catalogue first saw on October 7, 2026.

• Aaronontheweb/dotnet-skillsskills/ilspy-decompile
• NeverSight/learn-skills.devdata/skills-md/aaronontheweb/dotnet-skills/ilspy-decompile