# Prototype

Concept prototype before GDDs, throwaway HTML, Engine or Paper build...

- Repository: https://github.com/Donchitos/Claude-Code-Game-Studios (32144 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-10-19
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add Donchitos/Claude-Code-Game-Studios --skill prototype -g -a claude-code -y`
Codex: `npx skills add Donchitos/Claude-Code-Game-Studios --skill prototype -g -a codex -y`
Cursor: `npx skills add Donchitos/Claude-Code-Game-Studios --skill prototype -g -a cursor -y`
Gemini CLI: `npx skills add Donchitos/Claude-Code-Game-Studios --skill prototype -g -a gemini-cli -y`

## Description

Concept prototype before GDDs, throwaway HTML, Engine or Paper build, PROCEED/PIVOT/KILL/NOT ASSESSED. After /brainstorm and /setup-engine.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

!`bash "${CLAUDE_SKILL_DIR}/../../hooks/yaml-helper.sh" resolve_config --keys review_mode,automation,workflow`

Resolved above, use as-is; `--review` overrides `review_mode` for this run. No
block → defaults in `.claude/docs/config-resolution.md`.

# Prototype

## Purpose

This is the **concept prototype**, a fast, throwaway build that answers one question:
*"Is this core idea actually fun to interact with?"*

**Default use**, run right after `/brainstorm` and `/setup-engine`, before writing
GDDs or architecture docs. Its verdict determines whether the concept is worth the
investment of full design documentation.

**Mid-production?** You can also run this at any stage to test a specific mechanic,
design change, or technical question. Pass `--spike` to activate spike mode: a
lightweight ~4-hour build with no GDD prerequisites and no phase gate implications.

**Already have GDDs and architecture complete?** To validate the full game loop
before committing to Production, run `/vertical-slice` instead.

---

## Phase 1: Define the Question

**Read `references/1-question.md` now and follow it**, this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

## Phase 2: Load Concept Context

**Read `references/2-load-context.md` now and follow it**, this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

## Phase 3: Choose the Prototype Path

**Read `references/3-choose-path.md` now and follow it**, this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

## Phase 4: Plan the Prototype

**Read `references/4-plan.md` now and follow it**, this phase's steps are in that file, not here. Read it again if the conversation was compacted or resumed during this phase.

## Phase 5: Implement

The rest: https://github.com/Donchitos/Claude-Code-Game-Studios/blob/HEAD/.claude/skills/prototype/SKILL.md