Concept prototype — validate the core idea is worth designing before writing GDDs. Run right after /brainstorm and /setup-engine. Routes to HTML, Engine, or Paper path based on game type. Produces a throwaway build and a PROCEED/PIVOT/KILL verdict.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Prototype
Codex port of Claude Code Game Studios /prototype.
Use this skill when the task matches the workflow described below. Keep the
Codex version lightweight: load `references/claude-skill.md` only when the
original detailed Claude workflow is needed.
## Codex Workflow
1. Read repository-local instructions first: `AGENTS.md`, `CLAUDE.md`, the
nearest path-scoped instructions (`Assets/CLAUDE.md` for Unity when present),
and any referenced project docs.
2. Use this workflow's intent, but follow Codex tool and collaboration rules.
3. Apply SOLID, Clean Code, clear English naming, dependency boundaries, and
focused tests for new or changed expected behavior.
4. When a Claude workflow mentions a custom agent, treat it as a role reference.
Do the work locally unless the user explicitly asks for sub-agents or
parallel agent work.
5. For implementation tasks, make the change directly when the request is clear;
ask only when a decision cannot be safely inferred from local context.
6. Verify with the repository's available checks and summarize changed files,
tests run, and residual risk.
## Original Workflow Summary
…
The line at the top of this page pins the label git:20260907.501dbca, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_p3y2cvbfs3bgp5en
GET https://markdownregistry.com/api/v1/resolve?ref=furkantokkan/agent-foundry/prototype
GET https://markdownregistry.com/api/v1/blob/822f358fa747b7d0dda7847fa1e598c136bacf12bd1d04d74abccc82fbd44ee0
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
furkantokkan/agent-foundry · plugins/agent-foundry/skills/adaptive-skills/SKILL.md · Use when a task may span multiple personal skills and Codex should choose the smallest relevant skill set across Unity…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/agent-orchestration/SKILL.md · Coordinate game, Unity, web, SaaS, and tooling work through one orchestration workflow across Claude and Codex. Resolve…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/architecture-decision/SKILL.md · Creates an Architecture Decision Record (ADR) documenting a significant technical decision, its context, alternatives…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/architecture-review/SKILL.md · Validates completeness and consistency of the project architecture against all GDDs. Builds a traceability matrix…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/art-bible/SKILL.md · Guided, section-by-section Art Bible authoring. Creates the visual identity specification that gates all asset…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/asset-audit/SKILL.md · Audits game assets for compliance with naming conventions, file size budgets, format standards, and pipeline…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/asset-spec/SKILL.md · Generate per-asset visual specifications and AI generation prompts from GDDs, level docs, or character profiles…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/balance-check/SKILL.md · Analyzes game balance data files, formulas, and configuration to identify outliers, broken progressions, degenerate…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/brainstorm/SKILL.md · Guided game concept ideation — from zero idea to a structured game concept document. Uses professional studio ideation…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/bug-report/SKILL.md · Creates a structured bug report from a description, or analyzes code to identify potential bugs. Ensures every bug…
furkantokkan/agent-foundry · plugins/agent-foundry/skills/bug-triage/SKILL.md · Read all open bugs in production/qa/bugs/, re-evaluate priority vs. severity, assign to sprints, surface systemic…
emilkowalski/skills · skills/prototype/SKILL.md · Build multiple genuinely different versions of a UI piece you describe, rendered behind a visual picker so you can flip…
plugin87/ux-ui-agent-skills · .claude/skills/prototype/SKILL.md · Move an idea up the fidelity ladder (content-first → wireframe → low-fi → high-fi → code) with a validation plan at…
mxyhi/ok-skills · prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
tobihagemann/turbo · claude/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
tobihagemann/turbo · codex/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
asymmetric-al/core · .agents/skills/prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
swingerman/engineer · engineer/skills/prototype/SKILL.md · Use to rough out a working thing fast, zero ceremony, before committing to the pipeline — the prototype IS the spec…
