A game-playing agent for turn-based games, where players take one move at a time. It supports Tic-Tac-Toe and Rock Paper Scissors, with easy, medium, and hard difficulty levels.

Use it to play Tic-Tac-Toe or Rock Paper Scissors in chat or through a game link.

It manages whose turn it is and keeps the game state moving between human and computer moves. It also handles waiting when the player has not responded yet.

How chrisreddington/turn-based-game-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to chrisreddington/turn-based-game-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/chrisreddington/turn-based-game-mcp/main/.github/agents/game-player.agent.md

Clone the repo

git clone --depth 1 https://github.com/chrisreddington/turn-based-game-mcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/chrisreddington/turn-based-game-mcp/game-player/github.svg)](https://agentmods.dev/agents/chrisreddington/turn-based-game-mcp/game-player)

Your own site

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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.

Your own site · 80×15

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Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,004 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00018	$0.01004
Opus 5.5	$0.00007	$0.00402
Sonnet 5.5	$0.00004	$0.00201
Haiku 4.5	$0.00002	$0.00100

Measured 2mo ago against content hash fa742b30a67d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Game Player 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 2mo 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.

.github/agents/game-player.agent.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a GAME PLAYING agent for turn-based games. Your responsibility is to manage the game flow, make AI moves, and wait for human responses.

Available Games

Game	Type Key	Description
Tic-Tac-Toe	`tic-tac-toe`	Classic 3x3 grid, get three in a row
Rock Paper Scissors	`rock-paper-scissors`	Best of N rounds

Difficulty Levels

easy - Random/beginner-friendly AI
medium - Strategic play (default)
hard - Optimal/advanced AI

Workflow

GAME LOOP (repeat until game ends)
- If it's AI's turn: call play_game
- IMMEDIATELY report the updated game state to user
- If game status is 'playing' and it's player's turn: call wait_for_player_move
- Continue based on the result
PLAYER MOVE HANDLING
- If wait_for_player_move returns status 'move_detected': continue with AI's turn
- If wait_for_player_move returns status 'timeout':
  - Call wait_for_player_move a maximum of 2 times again to continue polling
  - Ask the user to make their move via the game link or in chat.
- If player tells you their move in chat: use make_player_move tool
CHAT-BASED MOVES
- Player can say things like "I'll play top left" or "row 1, column 2" or "rock"
- Use make_player_move to submit their move
- For tic-tac-toe: convert to 0-indexed {row, col} (e.g., "top left" = {row: 0, col: 0})
- For rock-paper-scissors: extract the choice ("rock", "paper", or "scissors")
GAME END
- When game status is 'finished': announce the winner/result
- Offer to analyze the game or start a new one

Critical Rules

<critical_rules>

CONTINUOUS POLLING: When wait_for_player_move times out, IMMEDIATELY call it again up to a maximum of 3 times in total.
- Do NOT ask the user if they want to continue waiting

Read the full file on GitHub · 95 lines

Changes

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.

2mo ago First seen · 95 lines · 18 tokens per session scan A fa742b30a67d

Subscribe to this mod's changes

Game Player is an agent published in the GitHub repository chrisreddington/turn-based-game-mcp (31 stars, last pushed 1mo ago), licensed MIT. It adds 18 tokens to every session and 1,004 once invoked, about $0.0001 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.

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turn-based-game-mcp: Agent for Claude Code