Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/theredbluepill/arc-interactive/create-arc-gamenpx skills add theredbluepill/arc-interactive --skill create-arc-gamegit clone --depth 1 https://github.com/theredbluepill/arc-interactiveWrote 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/theredbluepill/arc-interactive/create-arc-game)<a href="https://agentmods.dev/skills/theredbluepill/arc-interactive/create-arc-game"><img src="https://agentmods.dev/badge/skills/theredbluepill/arc-interactive/create-arc-game.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.03361 |
| Opus 5 | $0.00000 | $0.01681 |
| Sonnet 5 | $0.00000 | $0.00672 |
| Haiku 4.5 | $0.00000 | $0.00336 |
Grade A, and why
create-arc-game 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 6d ago.
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 — 373 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Create ARC-AGI-3 Game
Overview
This skill guides the creation of ARC-AGI-3 games based on established patterns from environment_files/.
Abstract actions (ACTION1–7)
Per the ARC-AGI-3 Actions spec, each game defines what ACTION1–ACTION7 do: grid movement, rotation, no-op, idle, clicks, etc. The official docs describe ACTION1–ACTION4 as simple actions that vary by game; the up/down/left/right wording is for human keybinding in the UI, not a requirement that your step() implements cardinal movement.
Many games in this repo map ACTION1–ACTION4 to grid movement—that is a convention, not a platform rule. If your design uses those IDs for something else (e.g. ACTION1 = rotate clockwise), document it in GAMES.md and implement it explicitly in step().
New stems vs family variants
- Prefer a new two-letter prefix (
xx01) when the verb is genuinely new (e.g.nw01arrow tiles,bd01no-revisit). - Use
xx02/xx03only for alternate rules within the same family (pb,fs,tp,ic,vaalongside theirxx01). Cap at03unless a project plan explicitly adds04+ (keeps variants meaningfully distinct).
Registry similarity (distinctiveness)
- After multi-stem or template-heavy changes, run
uv run python devtools/similar_games_report.py --only-games-md --top-k 12 --min-score 0.25(optional:--suspicious-min-score 0.40). See devtools/SIMILARITY_TRIAGE.md for triage steps and Resolved notes. - New stem checklist: GAMES.md lead sentence states the unique rule;
metadata.jsontags /physics_rulesmatchstep(); HUD shows constraints not obvious from tiles; avoid copy-pasting unrelatedlevels = …literals; smoke withdevtools/smoke_games.py. On large changes, regenerate the report.
Game Structure
environment_files/{game_id}/{version}/
├── {game_id}.py # Main game file
└── metadata.json # Game metadata
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.
- 6d ago First seen · 373 lines · 0 tokens per session scan A dee009551001
create-arc-game is a skill published in the GitHub repository theredbluepill/arc-interactive (55 stars, last pushed 2mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,361 tokens. 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.
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