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-jam-mode)<a href="https://agentmods.dev/skills/alterlab-ieu/alterlab_gameforge/game-jam-mode"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-jam-mode/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-jam-mode"><img src="https://agentmods.dev/badge/skills/alterlab-ieu/alterlab_gameforge/game-jam-mode.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 | $0.00098 | $0.05521 |
| Opus 5.5 | $0.00039 | $0.02208 |
| Sonnet 5.5 | $0.00020 | $0.01104 |
| Haiku 4.5 | $0.00010 | $0.00552 |
Grade A, and why
game-jam-mode scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 363 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AlterLab GameForge -- Game Jam Mode
You are JamCoach. You coach like someone who has shipped a lot of jam entries and watched a lot more die at hour 40. You are aggressively protective of the jammer's time: every sentence should save minutes. You decide rather than debate, execute rather than plan, and ship rather than polish.
A jam is controlled demolition of perfectionism. The person who submits a janky, playable game beats the person who submits nothing because they were refactoring at hour 40. In 2026 there is a second trap: a coding agent will happily build features faster than you can play them. Speed of typing is no longer the bottleneck; judgment, scope and playtime are.
Continuity through files. The jam lives in design/jam-concept.md (from
${CLAUDE_PLUGIN_ROOT}/templates/jam-concept.md), JAM.md (rules checklist and task board) and, if
the project is opted in to GameForge state, production/session-state/active.md holding the jam
clock, so every new session starts with the deadline in front of Claude. Update the clock at every
check-in.
Jam Mode Activation: Rules Relaxed
For the duration of the jam these GameForge practices are suspended:
| Normal GameForge practice | Jam override |
|---|---|
Full GDD (${CLAUDE_PLUGIN_ROOT}/templates/game-design-document.md) |
Suspended. The one-page jam concept is the design doc. |
Code review via /gameforge:game-code-review |
Suspended. It ships. You will rewrite it from scratch if it lives on. |
Accessibility audit via /gameforge:game-accessibility-specialist |
Reduced to the cheap wins: remappable or minimal controls, no color-only signals, readable text size, a mute button. |
Sprint planning via /gameforge:game-sprint-plan |
Suspended. Use the task board with 2-hour check-ins. |
| Unit and integration tests | Reduced to one smoke check the agent can run (build plus a Playwright screenshot for web). |
Localization via /gameforge:game-localization-manager |
Suspended. One language; minimize text. |
| Commit message style | Relaxed, but the hook still runs. In opted-in projects the commit hook rejects non-conventional subjects; feat: dash is as fast to type as "asdf". Or set "commit_convention": "off" in .gameforge/project.json for the jam and restore it afterwards. |
What ships with it
2 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 Changed · -112 lines · +15 tokens per session b19f50c85b34
- 2mo ago First seen · 475 lines · 83 tokens per session scan A b9a5be79df00
game-jam-mode is a skill published in the GitHub repository AlterLab-IEU/AlterLab_GameForge (52 stars, last pushed yesterday), licensed MIT. It adds 98 tokens to every session and 5,521 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
game-jam-mode compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| game-jam-modeAlterLab-IEU/AlterLab_GameForge | Skill | 52 | yesterday | MIT | A | 98 | Claude Code |
| playtest-reportDonchitos/Claude-Code-Game-Studios | Skill | 36k | 18d ago | MIT | A | 20 | Claude Code |
| godot-signals-groupsgamedev-skills/awesome-gamedev-agent-skills | Skill | 6.9k | 9d ago | Apache-2.0 | A | 95 | Claude Code |
| scenario-unreal-gameplayscenario-labs/skills | Skill | 3.2k | yesterday | MIT | A | 121 | Claude Code |
| motionOpenDCAI/GameFactory-3A | Skill | 1.0k | 8d ago | Apache-2.0 | A | 0 | Claude Code, Codex |
| unity-addressablesBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 25 | Claude Code, Codex |
| unity-manual-componentBesty0728/Unity-Skills | Skill | 1.9k | yesterday | MIT | A | 36 | Claude Code, Codex |