Game Asset Generator
htdt/godogen
Generates game art from text prompts: PNG images, GLB 3D models, rigged characters, animations and sprites, with background removal.
Agent skill
Sheet Definition
by LiberatedPixelCup in LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator
Add or edit sheetdefinitions JSON for items, categories, variants, credits, layers, or z-positions.
GPL-3.0Auto-check passed
Install Sheet Definition
$ npx skills add LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definition --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/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/sheet-definition .claude/skills/sheet-definition && 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 "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .claude/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definitionType 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definition --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/sheet-definition .agents/skills/sheet-definition && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .agents/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definition --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/sheet-definition .cursor/skills/sheet-definition && 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 "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .cursor/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git --path .agents/skills/sheet-definition--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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definition --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/sheet-definition .gemini/skills/sheet-definition && 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 "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .gemini/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definitionInstalls 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/sheet-definition .github/skills/sheet-definition && 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 "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .github/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator sheet-definition --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/sheet-definition .opencode/skills/sheet-definition && 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 "sheet-definition" agent skill from https://github.com/LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator/tree/master/.agents/skills/sheet-definition into .opencode/skills/sheet-definition/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sheet-definition", 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
sheet-definition- GitHub stars
- 1.8k
- Token cost
- ~676 tokens
- SKILL.md length
- 274 words
- Files
- 1
- Skills in repo
- 11
- Repo updated
- First seen
- Licence
- GPL-3.0
At a glance
Add or edit sheetdefinitions JSON for items, categories, variants, credits, layers, or z-positions.
- A credits entry
- Calls npm
- Renaming an asset
What it does
Sheet Definition is an agent skill from LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator. Add or edit sheetdefinitions JSON for items, categories, variants, credits, layers, or z-positions. Use when adding art, a new category, a credits entry, or renaming an asset. Copy a neighboring definition; do not invent keys.
Its SKILL.md is about 680 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: Character Generator based on Universal-LPC-Spritesheet. The licence is GPL-3.0.
When your agent uses it
- A credits entry
- Renaming an asset
Example prompts
- “/sheet-definition”
What it can do on your machine
Read from SKILL.md and the folder at commit 58ce1aa. 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
Shell commands in SKILL.md call:
npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, which can reach the network depending on how they are called.
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
Sheet Definition loads about 676 tokens when it runs. Until then it costs about 61 tokens; SKILL.md has 274 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
The full file from LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator at commit 58ce1aa, republished under its GPL-3.0 licence (© LiberatedPixelCup). 274 words, ~676 tokens.
Download SKILL.mdSave it as
.claude/skills/sheet-definition/SKILL.md (or your agent's skills folder).- name
- sheet-definition
- description
- Add or edit sheet_definitions JSON for items, categories, variants, credits, layers, or z-positions. Use when adding art, a new category, a credits entry, or renaming an asset. Copy a neighboring definition; do not invent keys.
Sheet definitions
Copy a neighboring JSON under sheet_definitions/. Do not invent a schema.
Accepted fields: SheetDefinition in
scripts/generateSources/items.ts.
Human walkthrough and the credits example:
CONTRIBUTING.md.
Multi-layer example: tail_lizard.json.
Typical required keys: name, type_name, layer_1 (zPos plus body-type
paths into spritesheets/), and credits[] (file, authors, licenses,
urls; notes is optional).
type_name is the hash key and name supplies the Item half of the
Item_variant hash value, so both are part of the URL contract — see
catalog.
credits[].file must name the spritesheet file or one of its path-segment
ancestors, not an arbitrary string prefix. searchCredit in
credits.ts matches
credit.file against the path exactly, against path + ".png", or against
credit.file + "/", then retries after trimming at the last /. So
arms/hands/ring covers arms/hands/ring/stud, but arms/hands/ri covers
nothing. Failing to match logs missing credit after searching recursively
and then throws missing credit inside ….
Existing category: add PNGs under spritesheets/ and the variant name on
the matching definition (variants). Palette-backed items use recolors and
do not add a PNG per color — follow
Adding Palette Support,
do not invent recolors keys.
New category: new JSON next to similar items.
Optional: animations restricts the animations filter; omit it for the
default list. Asset renames need aliases on the destination definition
and an issue first. Other keys (tags, replace_in_path, match_body_color,
…) — copy a neighbor that already uses them.
Then npm run validate-site-sources and commit any dirty CREDITS.csv /
z_positions.csv. CREDITS.csv is generate-only. z_positions.csv may be
edited as a bulk aid; JSON is the source of truth
(npm run z-positions:update writes the CSV back to JSON). The app reads
generated dist/*-metadata.js, not the JSON directly; if a new item is
invisible after npm run dev, see
generated-metadata.
© LiberatedPixelCup, GPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/sheet-definition of LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator.
Open the folder on GitHubat commit 58ce1aa
Compare with similar skills
Sheet Definition 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 |
|---|---|---|---|---|---|---|
| Sheet Definition this skillLiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator | 1.8k | — | ~676 | Automated safety check: Pass | GPL-3.0 | |
| Game Asset Generatorhtdt/godogen | 7.1k | — | ~2.8k | Automated safety check: Pass | MIT | |
| Code-Drawn 2D Game Art0x0funky/agent-sprite-forge | 4.3k | — | ~2.5k | Automated safety check: Pass | MIT | |
| Sprite Genaldegad/sprite-gen | 2.6k | — | ~4.5k | Automated safety check: Pass | Apache-2.0 | |
| Hatch PethAcKlyc/MyAgents | 918 | 2 repos | ~9.5k | Automated safety check: Pass | Apache-2.0 | |
| Pixel Artmateaix/mateclaw | 1.1k | 5 repos | ~1.8k | Automated safety check: Pass | Apache-2.0 |
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Sprite Gen
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Generates images and game sprites through GPT or Grok with guided provider choices, separate saved defaults, automatic cleanup and optional curation.
Hatch Pet
hAcKlyc/MyAgents
Create, repair, validate, visually QA, and package MyAgents/Codex-compatible animated pets and pet spritesheets from character art, generated images, company or prospect brand cues, or visual…
Pixel Art
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Pixel art w/ era palettes (NES, Game Boy, PICO-8). An agent skill from mateaix/mateclaw.
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Coverage
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Run and read unit-test coverage for this repo and satisfy the codecov/patch and codecov/changes gates.
Performance Profiling
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Run the headless app, catalog-load, and ZIP profilers and interpret the JSON the way a human would from window.profiler.report(), profile:load, and the ZIP console table.
Run One Spec
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Run a single Node, browser, or Playwright spec instead of the full suite.
Typescript
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Write TypeScript that satisfies this repo's lint and tsconfig rules, and convert an existing .js file to .ts without breaking its call sites.
Generated Metadata
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Diagnose missing or stale dist/-metadata.js, the Vite metadata plugin cache, and the ../name-metadata.js import alias.
Questions about Sheet Definition
What does Sheet Definition do?
Add or edit sheetdefinitions JSON for items, categories, variants, credits, layers, or z-positions. Sheet Definition is an agent skill from LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator. Add or edit sheetdefinitions JSON for items, categories, variants, credits, layers, or z-positions.
When should I use Sheet Definition?
Sheet Definition fits situations like: A credits entry; renaming an asset.
How do I install Sheet Definition in Claude Code?
Run `npx skills add LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a claude-code`. Or copy the skill folder (.agents/skills/sheet-definition in LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator) into .claude/skills/sheet-definition in your project. Claude Code loads it when a task matches its description.
How do I install Sheet Definition in Codex?
Run `npx skills add LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a codex`. Or copy the skill folder (.agents/skills/sheet-definition in LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator) into .agents/skills/sheet-definition in your project. Codex loads it when a task matches its description.
Can I use Sheet Definition 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 LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator --skill sheet-definition -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sheet-definition, .gemini/skills/sheet-definition, .github/skills/sheet-definition and .opencode/skills/sheet-definition in your project.
What does Sheet Definition need to run?
Going by SKILL.md and its folder, Sheet Definition needs the command-line tools its instructions call (npm).
Does Sheet Definition access the network?
SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Sheet Definition 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 Sheet Definition use?
Sheet Definition is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Sheet Definition use?
About 676 tokens (SKILL.md is roughly 2.7k 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 Sheet Definition?
Skills that share tags, products or a category with Sheet Definition: Game Asset Generator (htdt/godogen, 7.1k stars), Code-Drawn 2D Game Art (0x0funky/agent-sprite-forge, 4.3k stars), Sprite Gen (aldegad/sprite-gen, 2.6k stars) and Hatch Pet (hAcKlyc/MyAgents, 918 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Sheet Definition?
LiberatedPixelCup (a GitHub organization) maintains it in LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator, which has 1,829 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on October 7, 2026.
Source: LiberatedPixelCup/Universal-LPC-Spritesheet-Character-Generator on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.