Borrowing it
Nothing to install: this file belongs to alexup71rus/Chess-and-MCP-Arena. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/alexup71rus/Chess-and-MCP-Arena/main/.agents/skills/chess-play/SKILL.mdgit clone --depth 1 https://github.com/alexup71rus/Chess-and-MCP-ArenaWrote 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/alexup71rus/chess-and-mcp-arena/chess-play)<a href="https://agentmods.dev/skills/alexup71rus/chess-and-mcp-arena/chess-play"><img src="https://agentmods.dev/badge/skills/alexup71rus/chess-and-mcp-arena/chess-play/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/alexup71rus/chess-and-mcp-arena/chess-play"><img src="https://agentmods.dev/badge/skills/alexup71rus/chess-and-mcp-arena/chess-play.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 | $0.00052 | $0.00925 |
| Opus 5 | $0.00026 | $0.00463 |
| Sonnet 5 | $0.00010 | $0.00185 |
| Haiku 4.5 | $0.00005 | $0.00093 |
Grade A, and why
chess-play 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 11d 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 — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.
chess-play: шахматы через MCP
В проекте всегда существует не больше одной активной online-партии. Её создаёт
пользователь в UI на http://127.0.0.1:5173; агент не создаёт и не сбрасывает
матч. MCP работает на http://127.0.0.1:5173/mcp и закрепляет сторону за
текущей MCP-сессией.
Основные правила также приходят через поле instructions ответа MCP
initialize, поэтому их получают клиенты, которые не обнаруживают repository
skills.
Перед игрой
Проверьте GET http://127.0.0.1:5173/health. Если сервер не отвечает, попросите
пользователя запустить pnpm dev. Не запускайте долгоживущий dev server без
явного разрешения.
Пользователь должен сначала выбрать режим и начать матч в браузере. Если tool сообщает, что активной партии нет, попросите пользователя создать её через UI.
Инструменты
| Tool | Назначение |
|---|---|
join_game({color?}) |
Закрепить за MCP-сессией агентскую сторону. |
get_state() |
Увидеть режим, очередь, статус, историю, FEN и доску. |
legal_moves({from}) |
Получить легальные ходы выбранной своей фигуры. |
make_move({move, promotion?}) |
Сделать ход за закреплённую сторону. |
resign() |
Сдаться за закреплённую сторону. |
Вход в матч
Человек против агента
Вызовите join_game() без цвета. Сервер автоматически закрепит единственную
агентскую сторону и вернёт, играете вы белыми или чёрными.
Агент против агента
- Первый агент выбирает свободную сторону:
join_game({color:"w"})илиjoin_game({color:"b"}). - Второй агент вызывает
join_game()и получает оставшуюся сторону.
Нельзя занять сторону человека, уже занятую сторону или сменить цвет в рамках
той же MCP-сессии. После создания пользователем новой партии вызовите
join_game снова.
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.
- 11d ago First seen · 80 lines · 52 tokens per session scan A be0f97bdf79a
chess-play is a skill published in the GitHub repository alexup71rus/Chess-and-MCP-Arena (0 stars, last pushed 1mo ago), licensed MIT. It adds 52 tokens to every session and 925 once invoked, about $0.0003 per session on Opus 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 2026-08-31.
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