Chess Eval

Official2 tools

by x402supply

Stockfish chess eval: best move, score, principal variation, multipv. $0.003/call via x402.

Stockfish chess eval: best move, score, principal variation, multipv. $0.003/call via x402.

🛠️ Key Features

Calculates best move and evaluation score
Returns principal variation and multipv outputs
Accessible via a low-cost per-call pricing ($0.003)

🚀 Use Cases

Chess engine analysis for games and positions
Quick evaluation for move selection and strategy planning
Integrates into development pipelines needing engine insights

⚡ Developer Benefits

Simple API-style access to core Stockfish evaluations
Grounded pricing model for per-call usage
Clear data points: best move, score, PV, multipv

⚠️ Limitations

Pricing and availability depend on x402 service terms
External dependency; latency and usage limits may apply
Evaluation quality tied to underlying Stockfish version and input position

Captured live from the server via tools/list.

evaluate_position

Evaluate a chess position with Stockfish: best move, centipawn/mate score, principal variation, and optional multipv. No mocks — a real single-threaded Stockfish 10 (asm.js) runs in-isolate per call.

Parameters3

fen	string	required
depth	integer	optional
multipv	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "fen": {
      "type": "string"
    },
    "depth": {
      "type": "integer",
      "minimum": 1,
      "maximum": 18
    },
    "multipv": {
      "type": "integer",
      "minimum": 1,
      "maximum": 5
    }
  },
  "required": [
    "fen"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

best_line

Play out Stockfish's predicted principal variation as SAN moves with a per-ply eval, re-searching after each ply.

Parameters3

fen	string	required
depth	integer	optional
maxPlies	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "fen": {
      "type": "string"
    },
    "depth": {
      "type": "integer",
      "minimum": 1,
      "maximum": 18
    },
    "maxPlies": {
      "type": "integer",
      "minimum": 1,
      "maximum": 40
    }
  },
  "required": [
    "fen"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Install

Tools (2)

evaluate_positionbest_line

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://chess-eval.x402supply.com/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "chess-eval": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://chess-eval.x402supply.com/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

Chess Eval - agentage MCP Catalog