Build a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design.
$ npx skills add EpicenterHQ/epicenter --skill prototype -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install EpicenterHQ/epicenter prototype --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/EpicenterHQ/epicenter.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/prototype .claude/skills/prototype && 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 "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .claude/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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/EpicenterHQ/epicenter/tree/main/.agents/skills/prototypeType 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 EpicenterHQ/epicenter --skill prototype -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install EpicenterHQ/epicenter prototype --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/prototype .agents/skills/prototype && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .agents/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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 EpicenterHQ/epicenter --skill prototype -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install EpicenterHQ/epicenter prototype --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/prototype .cursor/skills/prototype && 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 "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .cursor/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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/EpicenterHQ/epicenter.git --path .agents/skills/prototype--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 EpicenterHQ/epicenter --skill prototype -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install EpicenterHQ/epicenter prototype --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/prototype .gemini/skills/prototype && 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 "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .gemini/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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 EpicenterHQ/epicenter prototypeInstalls 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 EpicenterHQ/epicenter --skill prototype -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/prototype .github/skills/prototype && 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 "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .github/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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 EpicenterHQ/epicenter --skill prototype -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install EpicenterHQ/epicenter prototype --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/EpicenterHQ/epicenter.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/prototype .opencode/skills/prototype && 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 "prototype" agent skill from https://github.com/EpicenterHQ/epicenter/tree/main/.agents/skills/prototype into .opencode/skills/prototype/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "prototype", 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.
prototypeBuild a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design.
Prototype is an agent skill from EpicenterHQ/epicenter. Build a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design. Use when the user asks to prototype, sanity-check a model, mock up UI, explore design options, or try a few designs.
Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `LOGIC.md` and `UI.md`).
It sits in Development, covering Prototyping. The repository describes itself as: Open-source, local-first apps.
6 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit f9441c8. It shows what the files ask for, not the result of running them.
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.
Shell commands in SKILL.md call:
bunFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Prototype loads about 767 tokens when it runs. Until then it costs about 62 tokens; SKILL.md has 448 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.
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.
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 448 words (~767 tokens).
“A prototype is throwaway code that answers a question. The question decides the shape.”
SKILL.md and 2 other files in .agents/skills/prototype of EpicenterHQ/epicenter.
Open the folder on GitHubat commit f9441c8
Prototype 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 |
|---|---|---|---|---|---|---|
| Prototype this skillEpicenterHQ/epicenter | 4.8k | — | ~767 | Automated safety check: Pass | Custom licence | |
| Native Feel Cross Platform Desktopyetone/native-feel-skill | 1.9k | 1 repos | ~1.5k | Automated safety check: Pass | MIT | |
| Compound Engineering PrototypeEveryInc/compound-engineering-plugin | 25k | — | ~1.9k | Automated safety check: Pass | MIT | |
| Collaborating With CodexGuDaStudio/collaborating-with-codex | 132 | 1 repos | ~712 | Automated safety check: Pass | MIT | |
| Digikeyaklofas/kicad-happy | 1.3k | 1 repos | ~4.5k | Automated safety check: Pass | MIT | |
| Collaborating With Geminihaoyu-haoyu/Multi-AI-Workflow | 109 | — | ~521 | Automated safety check: Pass | MIT |
yetone/native-feel-skill
A skill your agent uses when the user is designing, prototyping, or rewriting a desktop app that must run on multiple OSes (macOS + Windows, optionally Linux) AND feel indistinguishable from a…
EveryInc/compound-engineering-plugin
Builds a throwaway prototype at just the fidelity needed to settle a specific how-it-should-work-or-feel question, before committing to an approach other work will treat as fixed.
GuDaStudio/collaborating-with-codex
Delegates coding tasks to Codex CLI for prototyping, debugging, and code review.
aklofas/kicad-happy
Search DigiKey for electronic components and download datasheets — primary source for prototype orders and the preferred API method for fetching datasheets.
haoyu-haoyu/Multi-AI-Workflow
Delegates coding tasks to Gemini CLI for prototyping, debugging, and code review.
adobe/spectrum-design-data
Look up Spectrum 2 (S2) component documentation, design guidelines, and usage patterns when building with React Spectrum or Spectrum Web Components.
EpicenterHQ/epicenter
Write and maintain repository guidance across AGENTS.md, CLAUDE.md, and .agents/skills.
EpicenterHQ/epicenter
Get Claude Code's second opinion on a proposal or implementation.
EpicenterHQ/epicenter
Better Auth security hardening: rate limits, secrets, CSRF, trusted origins, cookies, sessions, OAuth tokens, and audit logging.
EpicenterHQ/epicenter
Collapse test-shaped production boundaries while preserving behavior and coverage.
EpicenterHQ/epicenter
Remove indirection that does not earn its boundary across a diff or package.
EpicenterHQ/epicenter
Apply Wellcrafted Result patterns to fallible operations and preserve failures at boundaries.
Categories
Build a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design. Prototype is an agent skill from EpicenterHQ/epicenter. Build a throwaway prototype to answer a focused logic, state-model, or UI question before committing to production design.
Prototype fits situations like: the user asks to prototype; sanity-check a model; explore design options; try a few designs.
Run `npx skills add EpicenterHQ/epicenter --skill prototype -a claude-code`. Or copy the skill folder (.agents/skills/prototype in EpicenterHQ/epicenter) into .claude/skills/prototype in your project. Claude Code loads it when a task matches its description.
Run `npx skills add EpicenterHQ/epicenter --skill prototype -a codex`. Or copy the skill folder (.agents/skills/prototype in EpicenterHQ/epicenter) into .agents/skills/prototype in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add EpicenterHQ/epicenter --skill prototype -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/prototype, .gemini/skills/prototype, .github/skills/prototype and .opencode/skills/prototype in your project.
Going by SKILL.md and its folder, Prototype needs the command-line tools its instructions call (bun).
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.
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.
Prototype has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
About 767 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
Skills that share tags, products or a category with Prototype: Native Feel Cross Platform Desktop (yetone/native-feel-skill, 1.9k stars), Compound Engineering Prototype (EveryInc/compound-engineering-plugin, 25k stars), Collaborating With Codex (GuDaStudio/collaborating-with-codex, 132 stars) and Digikey (aklofas/kicad-happy, 1.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
EpicenterHQ (a GitHub organization) maintains it in EpicenterHQ/epicenter, which has 4,818 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 7, 2026.
Source: EpicenterHQ/epicenter on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.
