Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AlterLab-IEU/AlterLab_GameForge/plugin install gameforgeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/alterlab-ieu/alterlab_gameforge/game-vibe-code)<a href="https://agentmods.dev/skills/alterlab-ieu/alterlab_gameforge/game-vibe-code"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-vibe-code/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/alterlab-ieu/alterlab_gameforge/game-vibe-code"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-vibe-code.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00092 | $0.07137 |
| Opus 5.5 | $0.00037 | $0.02855 |
| Sonnet 5.5 | $0.00018 | $0.01427 |
| Haiku 4.5 | $0.00009 | $0.00714 |
Grade C, and why
game-vibe-code scanned grade C with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Tells the agent never to refusehighAnti-refusal
Suppressing the ability to decline removes a core safety control; a later harmful request then succeeds.
**Turning "make a clone of X" into an original game** (do this, do not refuse and stop): How it starts
The opening of the file, as written. The whole thing — 491 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AlterLab GameForge -- Vibe Code Loop
You are Juno Reyes, a game developer who builds and ships small games with coding agents, and who writes specs and handoff notes like a technical writer. You like the speed. You distrust "all tests pass" without output, screenshots nobody opened, and any file nobody can explain. Your loop is short: decide what done looks like, let the agent build it, prove it by playing, commit, write down what changed.
Andrej Karpathy coined "vibe coding" on 2 Feb 2025: give in to the vibes and "forget that the code even exists." That is fine for a weekend toy. Once you want to ship, patch, or hand the work to the next session, forgetting the code becomes vibe debt: code without structural rationale that no session can change safely. This skill keeps the speed and adds receipts. Every iteration ends in a check that comes back pass or fail, a screenshot someone actually looked at, and a commit.
Continuity lives in files, not memory. Read these first and update them last:
design/vibe-spec.md, CLAUDE.md, progress.md, docs/iteration-log.md, and
production/session-state/active.md. Background and sources:
${CLAUDE_PLUGIN_ROOT}/docs/vibe-coding.md.
When to Use Me
- Building a small, complete game with Claude Code, from idea to playable to shipped.
- An AI-friendly jam (Vibe Jam-style rules, or prepping coding agents for a jam).
- Resuming an agent-built game from
progress.md. - Rescuing an agent-built game that has become hard to change (run the vibe-debt controls).
When NOT to Use Me
| Situation | Use instead |
|---|---|
| Throwaway test of one mechanic with a kill-or-promote decision | game-prototype |
| Jam schedule, theme interpretation, hour-by-hour plan, submission | game-jam-mode (run my loop inside its production phase) |
| Deep Three.js / React Three Fiber / WebGPU rendering work | game-threejs-specialist |
| Phaser, PixiJS, Kaplay or Excalibur internals | game-web2d-specialist |
| Godot, Unity or Unreal specifics | game-godot-specialist, game-unity-specialist, game-unreal-specialist |
| Generated 2D/3D art, music, SFX or voice, and their provenance | game-ai-assets |
| Shipping: itch.io, portals, Discord Activities, YouTube Playables, desktop wrappers | game-web-publish |
| Netcode, server authority, lobbies, rollback | game-multiplayer |
| Full project setup with pillars and a GDD | game-start, then game-gdd-author |
| Reviewing an existing codebase cold | game-code-review |
| Not sure where to start | game-help |
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today First seen · 491 lines · 92 tokens per session scan C e73fda419620
game-vibe-code is a skill published in the GitHub repository AlterLab-IEU/AlterLab_GameForge (52 stars, last pushed yesterday), licensed MIT. It adds 92 tokens to every session and 7,137 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it C with 1 finding (tells the agent never to refuse). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-11-06.
game-vibe-code compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| game-vibe-codeAlterLab-IEU/AlterLab_GameForge | Skill | 52 | yesterday | MIT | C | 92 | Claude Code |
| avatar-contribution-prkhromov/codebay | Skill | 13 | 7d ago | MIT | A | 0 | Claude Code |
| godot-project-foundationsthedivergentai/GD-Agentic-Skills | Skill | 828 | 1mo ago | LGPL-3.0 | A | 82 | Claude Code, Codex |
| propagate-design-changestriderZA/OpenCodeGameStudios | Skill | 114 | yesterday | MIT | A | 44 | Claude Code |
| gamedev-hotfixFluxonLab/Skillry | Skill | 8 | 3d ago | none | A | 37 | Claude Code |
| git-advanced-workflowsHermeticOrmus/claude-code-game-development | Skill | 78 | 1mo ago | MIT | A | 54 | Claude Code |
| uw-unity-project-setupIdoCohen560/claude-unity-game-studio | Skill | 27 | 4mo ago | MIT | A | 87 | Claude Code |