Agent Skill
Prototype Fast skill
prototype-fastgamedev-skills/awesome-gamedev-agent-skillsskills/workflows/prototype-fast/SKILL.md
Build a playable prototype in about an hour to answer one question — is it fun? — with greybox primitives, a hard timebox, and explicit keep/kill criteria. Use when prototyping a mechanic, making a vertical slice or MVP, greyboxing/blockout, or judging throwaway vs keep.
always on
64 tokname + description
once used
1,365 tokSKILL.md body
bundled files
0
repo stars
2.7kGitHub
Install the Prototype Fast skill
Skills CLI (Claude Code, Codex, Cursor and others)
npx skills add https://github.com/gamedev-skills/awesome-gamedev-agent-skills --skill prototype-fast
Claude Code, by hand (all projects)
git clone --depth 1 https://github.com/gamedev-skills/awesome-gamedev-agent-skills.git /tmp/awesome-gamedev-agent-skills mkdir -p ~/.claude/skills cp -R /tmp/awesome-gamedev-agent-skills/skills/workflows/prototype-fast ~/.claude/skills/prototype-fast
For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.
What it costs your context
Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.
| When | What loads | Cost |
|---|---|---|
| Every session | Name and description | 64 tok |
| When the agent uses it | The SKILL.md instructions | 1,365 tok |
| Only if opened | No bundled files | — |
Until it is used, prototype-fast costs about 21× less than the median MCP server we measured (1,363 tokens on every turn). Installing all 75 skills from gamedev-skills/awesome-gamedev-agent-skills would load 6,712 tokens of descriptions. Skills vs MCP study
Checks
Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.
Checked 2026-10-22 · method
What's inside
The headings of its SKILL.md. Read the full file on GitHub.
- Prototype Fast
- When to use
- Core workflow
- Patterns
- 1. The prototype brief (fill this in before coding)
- 2. Greybox the core loop, fake everything else (engine-agnostic pseudocode)
- 3. Kill criteria — make the keep/kill call observable, not emotional
- 4. Containment: keep a spike out of the shipping codebase
- Pitfalls
- References
- Related skills
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