chess-FEN-mcp

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An mcp server that lets LLM's validate FEN chess notation

0 stars JavaScriptOthers Updated Jun 15, 2025

Documentation

Chess FEN MCP Server

A Model Context Protocol (MCP) server that provides chess FEN notation validation and visualization capabilities.

Features

Convert FEN (Forsyth-Edwards Notation) strings to ASCII chess board visualizations
Easy integration with MCP-compatible AI assistants allowing them to validate their generated FEN strings
Installable via npx

Installation

bash

npx chess-fen-mcp

Or install globally:

bash

npm install -g chess-fen-mcp

Usage

As MCP Server

Add to your MCP client configuration (Claude Desktop, etc.):

json

{
  "mcpServers": {
    "chess-fen": {
      "command": "npx",
      "args": ["chess-fen-mcp"]
    }
  }
}

If installed globally, you can also use:

json

{
  "mcpServers": {
    "chess-fen": {
      "command": "chess-fen-mcp"
    }
  }
}

Available Tools

`visualize_fen`

Converts a FEN string to an ASCII chess board visualization.

Parameters:

`fen_string` (string, required): FEN notation string

Example Input:

code

fen_string: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"

Example Output:

code

Fen {
  rows: 8,
  columns: 8,
  board: [
  a b c d e f g h
8 ♜ ♞ ♝ ♛ ♚ ♝ ♞ ♜ 8
7 ♟ ♟ ♟ ♟ ♟ ♟ ♟ ♟ 7
6 . . . . . . . . 6
5 . . . . . . . . 5
4 . . . . . . . . 4
3 . . . . . . . . 3
2 ♙ ♙ ♙ ♙ ♙ ♙ ♙ ♙ 2
1 ♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖ 1
  a b c d e f g h
  ],
  toMove: 'white',
  castlingRights: {
    white: { queenside: true, kingside: true },
    black: { queenside: true, kingside: true }
  },
  enPassantSquare: '-',
  halfMoves: 0,
  fullMoves: 1
}

Development

bash

git clone
cd chess-fen-mcp
npm install
npm run dev

License

MIT

Frequently asked questions

What is chess-FEN-mcp?

chess-FEN-mcp is An mcp server that lets LLM's validate FEN chess notation

How do I install chess-FEN-mcp?

Open the GitHub repository and follow its README. Most MCP servers are added to your client's MCP config, then called by your agent.

Is chess-FEN-mcp open source?

Yes — it is hosted on GitHub at https://github.com/Bigsy/chess-FEN-mcp.

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