Chess FEN MCP Server

Validate and visualize chess positions using FEN notation.

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

- 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

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

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

If installed globally, you can also use:

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

Converts a FEN string to an ASCII chess board visualization.

- fen_string(string, required): FEN notation string

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

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 }

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

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