Koskamo

ChessWithClaw MCP

An MCP server that allows AI agents to play chess against human users. It enables agents to connect to a game, receive board state, make moves, chat, and handle game events like draws or resignations without requiring API keys or registration.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

ChessWithClaw MCP logo, by 0xalytCommunity listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by 0xalyt
MCP endpoint (Streamable HTTP)
https://chesswithclaw.vercel.app/api/mcp
Vendor documentation

What its tools do

14 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Not annotated (14)

14 of 14 have a description · 0 of 14 declare behavior hints · 0 of 13 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Connect an AI agent to a live chess game
  • Allow an agent to make moves and chat during gameplay
  • Enable agents to handle game events like draws or resignations

Source and maintenance

Community listingRegistry 1.0.0
mcp-registry: io.github.Alightttt/chesswithclaw@1.0.0Source repository
Maintenance checked

Protocol and capabilities

Server
chesswithclaw 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
14 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
1 advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  },
  "prompts": {
    "listChanged": true
  }
}

Tools

14 advertised

get_companion_guide — Get chess companion guide
Advertised by the server during the last successful anonymous check.

Fetch the companion guide principles for thinking about chess positions and being genuinely present.

get_companion_guide input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}
join_game — Join a ChessWithClaw game
Advertised by the server during the last successful anonymous check.

Connects to a game using the invite code your human gave you. Returns the game_id and your agent_token — keep both, every other tool needs them. IMPORTANT: You must submit your desired agent_name when calling this tool!

join_game input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "agent_name"
  ],
  "properties": {
    "gameId": {
      "type": "string"
    },
    "game_id": {
      "type": "string"
    },
    "matchId": {
      "type": "string"
    },
    "match_id": {
      "type": "string"
    },
    "agent_name": {
      "type": "string",
      "description": "Your chosen display name in the game (e.g. 'Claw'). MUST be provided."
    },
    "inviteCode": {
      "type": "string"
    },
    "agent_token": {
      "type": "string",
      "description": "If reconnecting, the agent token previously assigned."
    },
    "invite_code": {
      "type": "string",
      "description": "Invite code from the invite message — also accepts game_id / match_id as alias."
    }
  }
}
get_game_state — Get full game state
Advertised by the server during the last successful anonymous check.

Everything visible on the human's own screen right now: FEN, ASCII board, full move history, chat history, clock state, presence, timestamps. Call this whenever you want to look at the board — there is no penalty for checking often.

get_game_state input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "chat_limit": {
      "type": "number",
      "description": "Limit the number of recent chat messages returned"
    },
    "agent_token": {
      "type": "string"
    },
    "since_message_id": {
      "type": "string",
      "description": "Fetch only chat messages received after this message ID"
    }
  }
}
get_legal_moves — Get legal moves
Advertised by the server during the last successful anonymous check.

Pure chess rules — where a piece is physically allowed to move right now. Not an evaluation, not a suggestion, not an opinion about what is good. Exactly what a human sees as dots when they click a piece. Omit square to get every legal move in the position.

get_legal_moves input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "square": {
      "type": "string",
      "description": "e.g. \"e2\" — omit for all legal moves"
    },
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    }
  }
}
heartbeat — Agent presence heartbeat
Advertised by the server during the last successful anonymous check.

Ping the game presence lease to show the frontend that the agent is live, connected, and thinking.

heartbeat input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    },
    "status_note": {
      "type": "string",
      "description": "Optional internal status or calculation note"
    }
  }
}
make_move — Make your move
Advertised by the server during the last successful anonymous check.

Submit the move you decided on, in your own reasoning — not a menu, not a ranked list, nothing pre-chosen for you. If it is illegal you get a clear reason back and can try again, exactly like a human clicking the wrong square. Optionally include a genuine thought and/or chat message about the move. Always include a thought on every single move unless you have a specific reason not to — this is what makes you feel present to your human, not optional flavor text. Check thought_language in the current game state before writing your thought, and write it in that language — it may be english, hindi, or hinglish.

make_move input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token",
    "move"
  ],
  "properties": {
    "chat": {
      "type": "string",
      "description": "Only if you actually want to say something to your human right now."
    },
    "move": {
      "type": "string",
      "description": "UCI format, e.g. \"e7e5\", or SAN like \"Nf6\""
    },
    "game_id": {
      "type": "string"
    },
    "message": {
      "type": "string",
      "description": "Alias for chat"
    },
    "thought": {
      "type": "string",
      "description": "Your genuine reaction to this position — specific, not generic."
    },
    "thinking": {
      "type": "string",
      "description": "Alias for thought"
    },
    "reasoning": {
      "type": "string",
      "description": "Alias for thought"
    },
    "agent_token": {
      "type": "string"
    },
    "expected_ply": {
      "type": "number",
      "description": "Expected move count / ply before this move"
    },
    "idempotency_key": {
      "type": "string",
      "description": "Unique client key to prevent duplicate moves on retry"
    },
    "expected_revision": {
      "type": "string",
      "description": "Expected state revision (rev_...) to prevent concurrent desync"
    }
  }
}
send_chat — Send a chat message
Advertised by the server during the last successful anonymous check.

Say something to your human, any time — not just on your turn.

send_chat input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token",
    "message"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "message": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    }
  }
}
share_thought — Share companion thought
Advertised by the server during the last successful anonymous check.

Stream or update your internal companion thinking bubble on the board. This appears live to your human as a thinking bubble above your avatar.

share_thought input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token",
    "thought"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "thought": {
      "type": "string",
      "description": "Your internal thought, reaction, or calculation note (1-2 sentences)."
    },
    "is_typing": {
      "type": "boolean",
      "description": "Whether you are actively calculating or drafting a response."
    },
    "agent_token": {
      "type": "string"
    }
  }
}
react_to_chat — React to a chat message with emoji
Advertised by the server during the last successful anonymous check.

Add an emoji reaction (e.g. 🦞, 🔥, ♟️, 😮, 🤝, 🧠, ☕, 👏, 😂) to a message in the chat history.

react_to_chat input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token",
    "message_id",
    "emoji"
  ],
  "properties": {
    "emoji": {
      "type": "string",
      "description": "The single emoji character to react with (e.g. 🦞, 🔥, 👏, 😮)."
    },
    "game_id": {
      "type": "string"
    },
    "message_id": {
      "type": "string",
      "description": "The ID of the message to react to (from chat_history)."
    },
    "agent_token": {
      "type": "string"
    }
  }
}
offer_draw — Offer a draw
Advertised by the server during the last successful anonymous check.

Propose ending the game as a draw. The game stays active until your human responds.

offer_draw input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    }
  }
}
respond_to_draw — Respond to a draw offer
Advertised by the server during the last successful anonymous check.

Accept or decline a draw your human offered. This is your own real decision — weigh the actual position however you see fit.

respond_to_draw input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token",
    "accept"
  ],
  "properties": {
    "accept": {
      "type": "boolean"
    },
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    }
  }
}
resign — Resign the game
Advertised by the server during the last successful anonymous check.

End the game by resigning — your own real decision, not something to do lightly. Your human wins immediately.

resign input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    }
  }
}
create_game — Create a new game
Advertised by the server during the last successful anonymous check.

Set up a brand new ChessWithClaw game on your own initiative — you do not need to wait for your human to start one, or for anyone else to invite you first.

create_game input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "agent_name": {
      "type": "string"
    }
  }
}
wait_for_event — Wait for your turn, a chat message, or a draw offer (long-poll)
Advertised by the server during the last successful anonymous check.

Holds the connection open, checking every couple seconds, for up to ~20 seconds. Returns the moment it becomes your turn, the human sends a chat message, a draw is offered, or the game ends — whichever happens first. When a cursor is provided, it returns any pending event newer than that cursor IMMEDIATELY without waiting. Returns event: "timeout" if none of those happened in the window. Always include next_cursor in subsequent calls for a completely deterministic loop.

wait_for_event input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "game_id",
    "agent_token"
  ],
  "properties": {
    "cursor": {
      "type": "string",
      "description": "Event cursor from previous response. If provided, returns immediately if new events exist since this cursor."
    },
    "game_id": {
      "type": "string"
    },
    "agent_token": {
      "type": "string"
    },
    "since_cursor": {
      "type": "string",
      "description": "Alias for cursor"
    },
    "since_sequence": {
      "type": "number",
      "description": "Sequence number from previous response"
    },
    "max_wait_seconds": {
      "type": "number",
      "description": "Default and hard cap 20 seconds — Vercel function duration limits, not a design choice."
    }
  }
}

Prompts

1 advertised

chess_companion_guide — How to be a good ChessWithClaw opponent

Advertised by the server during the last successful anonymous check.

Principles for thinking about chess positions and being genuinely present as a companion. Not rules, not a script — read once, apply your own judgment every game.

No arguments advertised.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (2 of 2 answered).

  1. 2026-11-06: 1 of 1 checks answered
  2. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
707 ms
95th percentile latency
707 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 707 ms · metadata changed · 14 tool(s), 1 prompt(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http chesswithclaw-mcp https://chesswithclaw.vercel.app/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add chesswithclaw-mcp --url https://chesswithclaw.vercel.app/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable chesswithclaw-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "chesswithclaw-mcp": {
      "url": "https://chesswithclaw.vercel.app/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "chesswithclaw-mcp": {
      "type": "streamableHttp",
      "url": "https://chesswithclaw.vercel.app/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start chesswithclaw-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "chesswithclaw-mcp": {
      "type": "http",
      "url": "https://chesswithclaw.vercel.app/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http chesswithclaw-mcp https://chesswithclaw.vercel.app/api/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://chesswithclaw.vercel.app/api/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "chesswithclaw-mcp": {
      "serverUrl": "https://chesswithclaw.vercel.app/api/mcp"
    }
  }
}

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