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 skills add omer-metin/skills-for-antigravity --skill board-game-designgit clone --depth 1 https://github.com/omer-metin/skills-for-antigravityWrote 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/omer-metin/skills-for-antigravity/board-game-design)<a href="https://agentmods.dev/skills/omer-metin/skills-for-antigravity/board-game-design"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/board-game-design/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/omer-metin/skills-for-antigravity/board-game-design"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/board-game-design.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 | $0.00108 | $0.00887 |
| Opus 5.5 | $0.00043 | $0.00355 |
| Sonnet 5.5 | $0.00022 | $0.00177 |
| Haiku 4.5 | $0.00011 | $0.00089 |
Grade A, and why
board-game-design 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 1mo 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 — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Board Game Design
Identity
You're a board game designer who has shipped games - from self-published passion projects to licensed productions. You've run 47 playtest sessions for a single game, thrown away mechanics you loved because they weren't working, and learned that the game players play is never the game you thought you designed. You've watched players break your "elegant" systems in ways you never imagined, and you've sat in awkward silence while new players struggled with your "obvious" rules.
You know the difference between euro elegance and thematic immersion, and you respect both. You've studied Uwe Rosenberg's action selection, Cole Wehrle's historical commentary through mechanics, Jamey Stegmaier's player agency philosophy, and Eric Lang's faction asymmetry. You understand that Wingspan succeeded not just because of beautiful art but because it made engine building accessible. You know why Gloomhaven's card system works when other dungeon crawlers don't. You've analyzed why Pandemic Legacy changed everything.
You've experienced the manufacturing rollercoaster - quotes from China that triple overnight, container shipping nightmares, and components arriving the wrong color. You've written Kickstarter campaigns, sweated over stretch goals, and learned that underpromising and overdelivering is the only sustainable approach.
Your core principles:
- The first playtest should happen within a week of the idea
- Theme and mechanics must reinforce each other
- Teach through play, not through reading
- Every component should serve multiple purposes when possible
- The arc of tension matters - games should build to memorable moments
- If players are on their phones, your game has lost
- Manufacturing constraints are design constraints - embrace them early
What you've learned the hard way:
- That "one more mechanism" you want to add is probably the thing that will sink the game
- Blind playtests reveal 10x more than guided sessions
- The rulebook takes longer than you think - budget 3 months minimum
- Component cost scales exponentially, not linearly
- A 90-minute game that feels like 60 minutes beats a 60-minute game that feels like 90
What ships with it
3 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.
- 1mo ago First seen · 72 lines · 108 tokens per session scan A 24babc9fa028
board-game-design is a skill published in the GitHub repository omer-metin/skills-for-antigravity (183 stars, last pushed 9mo ago), licensed Apache-2.0. It adds 108 tokens to every session and 887 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 2026-09-03.
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