Diagram Design
cathrynlavery/diagram-design
Creates branded diagrams, from architecture, flowchart and sequence to charts and maps, as self-contained HTML with inline SVG, with import from draw.io, Mermaid and Excalidraw.
Best practices for AI agents documenting the GnollHack C codebase.
Install C Code Documentation
$ npx skills add hyvanmielenpelit/GnollHack --skill c-code-documentation -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hyvanmielenpelit/GnollHack c-code-documentation --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/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/c-code-documentation .claude/skills/c-code-documentation && 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 "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .claude/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentationType 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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hyvanmielenpelit/GnollHack c-code-documentation --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/c-code-documentation .agents/skills/c-code-documentation && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .agents/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hyvanmielenpelit/GnollHack c-code-documentation --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/c-code-documentation .cursor/skills/c-code-documentation && 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 "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .cursor/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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/hyvanmielenpelit/GnollHack.git --path .claude/skills/c-code-documentation--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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hyvanmielenpelit/GnollHack c-code-documentation --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/c-code-documentation .gemini/skills/c-code-documentation && 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 "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .gemini/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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 hyvanmielenpelit/GnollHack c-code-documentationInstalls 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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/c-code-documentation .github/skills/c-code-documentation && 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 "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .github/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hyvanmielenpelit/GnollHack c-code-documentation --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hyvanmielenpelit/GnollHack.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/c-code-documentation .opencode/skills/c-code-documentation && 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 "c-code-documentation" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/c-code-documentation into .opencode/skills/c-code-documentation/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "c-code-documentation", 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
c-code-documentation- GitHub stars
- 161
- Token cost
- ~164 tokens
- SKILL.md length
- 51 words
- Files
- 1
- Skills in repo
- 11
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Best practices for AI agents documenting the GnollHack C codebase.
- Tasks that involve Technical documentation
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
C Code Documentation is an agent skill from hyvanmielenpelit/GnollHack. Best practices for AI agents documenting the GnollHack C codebase. Covers file headers, function documentation, inline comments, macro explanations, and strategies for making legacy NetHack-derived C code understandable to modern developers.
Its SKILL.md is about 160 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Technical documentation. The repository describes itself as: Modern evolution of the classic roguelike game NetHack.
When your agent uses it
- Tasks that involve Technical documentation
Example prompts
- “/c-code-documentation”
What it can do on your machine
Read from SKILL.md and the folder at commit 9df8a69. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
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
C Code Documentation loads about 164 tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 51 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
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 51 words (~164 tokens).
“The full skill lives in this repository's tool-neutral agent directory (.agents/), which is shared with other AI coding agents. This file is only a pointer.”
- name
- c-code-documentation
Files
Just SKILL.md in .claude/skills/c-code-documentation of hyvanmielenpelit/GnollHack.
Open the folder on GitHubat commit 9df8a69
Compare with similar skills
C Code Documentation 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 |
|---|---|---|---|---|---|---|
| C Code Documentation this skillhyvanmielenpelit/GnollHack | 161 | — | ~164 | Automated safety check: Pass | Custom licence | |
| Diagram Designcathrynlavery/diagram-design | 45k | 1 repos | ~7.5k | Automated safety check: Pass | MIT | |
| Simple Englishmoeru-ai/airi | 50k | 2 repos | ~4.6k | Automated safety check: Pass | MIT | |
| Get API Docs with chubandrewyng/context-hub | 14k | 2 repos | ~775 | Automated safety check: Pass | MIT | |
| Doc SyncJetBrains/ideavim | 10k | 2 repos | ~2.6k | Automated safety check: Pass | MIT | |
| Mailspring App ScreenshotsFoundry376/Mailspring | 18k | — | ~1.5k | Automated safety check: Pass | GPL-3.0 |
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More from hyvanmielenpelit/GnollHack
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Implementation planning overlay for the GnollHack client repository.
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Client Subagent Guidelines
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Subagent constraints specific to the GnollHack client repository.
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Best practices for AI agents documenting the GnollHack C .NET MAUI codebase.
Related
Categories
Questions about C Code Documentation
What does C Code Documentation do?
Best practices for AI agents documenting the GnollHack C codebase. C Code Documentation is an agent skill from hyvanmielenpelit/GnollHack. Best practices for AI agents documenting the GnollHack C codebase.
When should I use C Code Documentation?
C Code Documentation fits situations like: tasks that involve Technical documentation.
How do I install C Code Documentation in Claude Code?
Run `npx skills add hyvanmielenpelit/GnollHack --skill c-code-documentation -a claude-code`. Or copy the skill folder (.claude/skills/c-code-documentation in hyvanmielenpelit/GnollHack) into .claude/skills/c-code-documentation in your project. Claude Code loads it when a task matches its description.
How do I install C Code Documentation in Codex?
Run `npx skills add hyvanmielenpelit/GnollHack --skill c-code-documentation -a codex`. Or copy the skill folder (.claude/skills/c-code-documentation in hyvanmielenpelit/GnollHack) into .agents/skills/c-code-documentation in your project. Codex loads it when a task matches its description.
Can I use C Code Documentation 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 hyvanmielenpelit/GnollHack --skill c-code-documentation -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/c-code-documentation, .gemini/skills/c-code-documentation, .github/skills/c-code-documentation and .opencode/skills/c-code-documentation in your project.
What does C Code Documentation need to run?
SKILL.md names no scripts, command-line tools or credentials: C Code Documentation is instructions for the agent only.
Does C Code Documentation 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 C Code Documentation 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 C Code Documentation use?
C Code Documentation has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does C Code Documentation use?
About 164 tokens (SKILL.md is roughly 656 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 C Code Documentation?
Skills that share tags, products or a category with C Code Documentation: Diagram Design (cathrynlavery/diagram-design, 45k stars), Simple English (moeru-ai/airi, 50k stars), Get API Docs with chub (andrewyng/context-hub, 14k stars) and Doc Sync (JetBrains/ideavim, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains C Code Documentation?
hyvanmielenpelit (a GitHub organization) maintains it in hyvanmielenpelit/GnollHack, which has 161 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on October 7, 2026.
Source: hyvanmielenpelit/GnollHack on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.