Artifacts Builder
nexu-io/open-design
Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui).
Patterns for adding monsters, objects, and artifacts to GnollHack.
Custom licenceAuto-check passed
Install Adding Game Content
$ npx skills add hyvanmielenpelit/GnollHack --skill adding-game-content -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hyvanmielenpelit/GnollHack adding-game-content --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/adding-game-content .claude/skills/adding-game-content && 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 "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .claude/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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/adding-game-contentType 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 adding-game-content -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hyvanmielenpelit/GnollHack adding-game-content --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/adding-game-content .agents/skills/adding-game-content && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .agents/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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 adding-game-content -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hyvanmielenpelit/GnollHack adding-game-content --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/adding-game-content .cursor/skills/adding-game-content && 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 "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .cursor/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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/adding-game-content--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 adding-game-content -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hyvanmielenpelit/GnollHack adding-game-content --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/adding-game-content .gemini/skills/adding-game-content && 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 "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .gemini/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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 adding-game-contentInstalls 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 adding-game-content -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/adding-game-content .github/skills/adding-game-content && 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 "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .github/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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 adding-game-content -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 adding-game-content --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/adding-game-content .opencode/skills/adding-game-content && 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 "adding-game-content" agent skill from https://github.com/hyvanmielenpelit/GnollHack/tree/master/.claude/skills/adding-game-content into .opencode/skills/adding-game-content/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "adding-game-content", 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
adding-game-content- GitHub stars
- 161
- Token cost
- ~169 tokens
- SKILL.md length
- 51 words
- Files
- 1
- Skills in repo
- 11
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Patterns for adding monsters, objects, and artifacts to GnollHack.
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Adding Game Content is an agent skill from hyvanmielenpelit/GnollHack. Patterns for adding monsters, objects, and artifacts to GnollHack. Covers MON/WEAPON/ARMOR/A macro syntax, attack tuples, monster and object flags, the auto-generated headers (pm.h, onames.h), soundset and animation assignments, and the makedefs rebuild pipeline.
Its SKILL.md is about 170 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: Modern evolution of the classic roguelike game NetHack.
Example prompts
- “Use the adding-game-content skill to pattern for adding monsters, objects, and artifacts to GnollHack”
- “/adding-game-content”
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
Adding Game Content loads about 169 tokens when it runs. Until then it costs about 71 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 (~169 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
- adding-game-content
Files
Just SKILL.md in .claude/skills/adding-game-content of hyvanmielenpelit/GnollHack.
Open the folder on GitHubat commit 9df8a69
Compare with similar skills
Adding Game Content 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 |
|---|---|---|---|---|---|---|
| Adding Game Content this skillhyvanmielenpelit/GnollHack | 161 | — | ~169 | Automated safety check: Pass | Custom licence | |
| Artifacts Buildernexu-io/open-design | 100k | — | ~347 | Automated safety check: Pass | Apache-2.0 | |
| Web Artifacts Builderanthropics/skills | 180k | 41 repos | ~769 | Automated safety check: Pass | Apache-2.0 | |
| Web Artifacts Buildernexu-io/open-design | 100k | — | ~337 | Automated safety check: Pass | Apache-2.0 | |
| Web Artifacts Buildersickn33/agentic-awesome-skills | 47k | 3 repos | ~824 | Automated safety check: Pass | Apache-2.0 | |
| Object Altthedaviddias/Front-End-Checklist | 74k | — | ~429 | Automated safety check: Pass | MIT |
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Object Alt
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A skill your agent uses when reviewing rendered HTML, interactive components, or design-system patterns related to Provide alternative text for objects.
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More from hyvanmielenpelit/GnollHack
All 11 skills in this repoClient Implementation Planning
hyvanmielenpelit/GnollHack
Implementation planning overlay for the GnollHack client repository.
Sentry Crash Analysis
hyvanmielenpelit/GnollHack
Systematic methodology for diagnosing GnollHack crash reports from the Sentry MCP server.
Build Pipeline
hyvanmielenpelit/GnollHack
Guide on building GnollHack native C libraries, processing assets with makedefs/levcomp/dgncomp/dlb, packaging nhdat, and compiling the C .NET MAUI frontend for Android, iOS, and Windows.
C Code Documentation
hyvanmielenpelit/GnollHack
Best practices for AI agents documenting the GnollHack C codebase.
Client Subagent Guidelines
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Subagent constraints specific to the GnollHack client repository.
Csharp Code Documentation
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Best practices for AI agents documenting the GnollHack C .NET MAUI codebase.
Questions about Adding Game Content
What does Adding Game Content do?
Patterns for adding monsters, objects, and artifacts to GnollHack. Adding Game Content is an agent skill from hyvanmielenpelit/GnollHack. Patterns for adding monsters, objects, and artifacts to GnollHack.
How do I install Adding Game Content in Claude Code?
Run `npx skills add hyvanmielenpelit/GnollHack --skill adding-game-content -a claude-code`. Or copy the skill folder (.claude/skills/adding-game-content in hyvanmielenpelit/GnollHack) into .claude/skills/adding-game-content in your project. Claude Code loads it when a task matches its description.
How do I install Adding Game Content in Codex?
Run `npx skills add hyvanmielenpelit/GnollHack --skill adding-game-content -a codex`. Or copy the skill folder (.claude/skills/adding-game-content in hyvanmielenpelit/GnollHack) into .agents/skills/adding-game-content in your project. Codex loads it when a task matches its description.
Can I use Adding Game Content 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 adding-game-content -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/adding-game-content, .gemini/skills/adding-game-content, .github/skills/adding-game-content and .opencode/skills/adding-game-content in your project.
What does Adding Game Content need to run?
SKILL.md names no scripts, command-line tools or credentials: Adding Game Content is instructions for the agent only.
Does Adding Game Content 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 Adding Game Content 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 Adding Game Content use?
Adding Game Content 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 Adding Game Content use?
About 169 tokens (SKILL.md is roughly 676 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 Adding Game Content?
Skills that share tags, products or a category with Adding Game Content: Artifacts Builder (nexu-io/open-design, 100k stars), Web Artifacts Builder (anthropics/skills, 180k stars), Web Artifacts Builder (nexu-io/open-design, 100k stars) and Web Artifacts Builder (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Adding Game Content?
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.