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Understand implementation details of .NET code by decompiling assemblies.
No licenceAuto-check passed
Install Ilspy Decompile
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompile --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/ilspy-decompile .claude/skills/ilspy-decompile && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .claude/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompileType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompile --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/ilspy-decompile .agents/skills/ilspy-decompile && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .agents/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompile --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/ilspy-decompile .cursor/skills/ilspy-decompile && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .cursor/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/davidfowl/dotnet-skillz.git --path skills/ilspy-decompile--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompile --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/ilspy-decompile .gemini/skills/ilspy-decompile && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .gemini/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompileInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/ilspy-decompile .github/skills/ilspy-decompile && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .github/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install davidfowl/dotnet-skillz ilspy-decompile --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davidfowl/dotnet-skillz.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/ilspy-decompile .opencode/skills/ilspy-decompile && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "ilspy-decompile" agent skill from https://github.com/davidfowl/dotnet-skillz/tree/main/skills/ilspy-decompile into .opencode/skills/ilspy-decompile/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "ilspy-decompile", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
ilspy-decompile- GitHub stars
- 294
- Token cost
- ~1.3k tokens
- SKILL.md length
- 122 words
- Files
- 1
- Skills in repo
- 1
- Repo updated
- First seen
- Licence
- None found
At a glance
Understand implementation details of .NET code by decompiling assemblies.
- Works in 4 steps: Identify what you want to understand… → Locate the assembly containing that code → Use dnx ilspycmd -l class to find the… → …
- The user wants to see how a .NET API works internally
- SKILL.md covers Quick start, Common .NET Assembly Locations, Core workflow and Commands, plus 5 more sections
- Calls dotnet
What it does
Ilspy Decompile is an agent skill from davidfowl/dotnet-skillz. Understand implementation details of .NET code by decompiling assemblies. Use when the user wants to see how a .NET API works internally, inspect NuGet package source, view framework implementation, or understand compiled .NET binaries.
Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with .NET. The repository describes itself as: A set of skills for dotnet apps.
When your agent uses it
- The user wants 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(dnx:*)
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Identify what you want to understand (API, class, method)
- Locate the assembly containing that code
- Use dnx ilspycmd -l class to find the exact type name
- Decompile the specific type with -t
What it can do on your machine
Read from SKILL.md and the folder at commit ca19e87. 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(dnx:*)
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 1.3k tokens when it runs. Until then it costs about 63 tokens; SKILL.md has 122 words of instructions outside code blocks.
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
Auto-check passed
The automated check found no risky patterns in SKILL.md.
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
Without a licence we can't republish the file, so here is its outline and opening line. It has 122 words (~1,295 tokens).
“Use this skill to understand how .NET code works internally by decompiling compiled assemblies.”
- name
- ilspy-decompile
- allowed-tools
- Bash(dnx:*)
Files
Just SKILL.md in skills/ilspy-decompile of davidfowl/dotnet-skillz.
Open the folder on GitHubat commit ca19e87
Compare with similar skills
Ilspy Decompile next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Ilspy Decompile this skilldavidfowl/dotnet-skillz | 294 | — | ~1.3k | Automated safety check: Pass | None | |
| Minimax DOCXpoco-ai/poco-claw | 1.4k | 7 repos | ~3.9k | Automated safety check: Pass | MIT | |
| Microsoft Skill CreatorMicrosoftDocs/mcp | 1.9k | 3 repos | ~2.1k | Automated safety check: Pass | CC-BY-4.0 | |
| Speckit ConstitutionWeihanLi/WeihanLi.Common | 242 | 11 repos | ~2.1k | Automated safety check: Pass | Apache-2.0 | |
| Copilot Session Failure Analysisdotnet/maui | 23k | — | ~3.4k | Automated safety check: Pass | MIT | |
| Update .NET OS Packagesdotnet/core | 22k | — | ~2.3k | Automated safety check: Pass | MIT |
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MicrosoftDocs/mcp
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Speckit Constitution
WeihanLi/WeihanLi.Common
Create or update the project constitution from interactive or provided principle inputs, ensuring all dependent templates stay in sync.
- Official
Copilot Session Failure Analysis
dotnet/maui
Mines local Copilot CLI session logs for dotnet/maui to rank costly or failing runs, tag recurring failure modes, propose repo edits and emit guard evals.
- Official
Update .NET OS Packages
dotnet/core
Audits and updates os-packages.json files listing the Linux packages each .NET release needs per distro, then regenerates the Markdown from the JSON.
- Official
Microsoft Code Reference
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Related
Works with
Questions about Ilspy Decompile
What does Ilspy Decompile do?
Understand implementation details of .NET code by decompiling assemblies. Ilspy Decompile is an agent skill from davidfowl/dotnet-skillz.NET code by decompiling assemblies.
When should I use Ilspy Decompile?
Ilspy Decompile fits situations like: the user wants to see how a .NET API works internally; inspect NuGet package source; view framework implementation; understand compiled .NET binaries.
How do I install Ilspy Decompile in Claude Code?
Run `npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a claude-code`. Or copy the skill folder (skills/ilspy-decompile in davidfowl/dotnet-skillz) into .claude/skills/ilspy-decompile in your project. Claude Code loads it when a task matches its description.
How do I install Ilspy Decompile in Codex?
Run `npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a codex`. Or copy the skill folder (skills/ilspy-decompile in davidfowl/dotnet-skillz) into .agents/skills/ilspy-decompile in your project. Codex loads it when a task matches its description.
Can I use Ilspy Decompile in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add davidfowl/dotnet-skillz --skill ilspy-decompile -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ilspy-decompile, .gemini/skills/ilspy-decompile, .github/skills/ilspy-decompile and .opencode/skills/ilspy-decompile in your project.
What does Ilspy Decompile need to run?
Going by SKILL.md and its folder, Ilspy Decompile needs the command-line tools its instructions call (dotnet). Its frontmatter pre-approves these tools: Bash(dnx:*).
Does Ilspy Decompile access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Ilspy Decompile safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Ilspy Decompile use?
No licence was found for Ilspy Decompile or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Ilspy Decompile use?
About 1.3k tokens (SKILL.md is roughly 5.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Ilspy Decompile?
Skills that share tags, products or a category with Ilspy Decompile: Minimax DOCX (poco-ai/poco-claw, 1.4k stars), Microsoft Skill Creator (MicrosoftDocs/mcp, 1.9k stars), Speckit Constitution (WeihanLi/WeihanLi.Common, 242 stars) and Copilot Session Failure Analysis (dotnet/maui, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Ilspy Decompile?
davidfowl (a GitHub user) maintains it in davidfowl/dotnet-skillz, which has 294 GitHub stars. The repository was last updated on February 21, 2026.
Source: davidfowl/dotnet-skillz on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.