Legal & GovernmentMCP RegistrynpmA · 80

FIDE Laws of Chess MCP server

io.arxo · Updated 14d ago

FIDE Laws of Chess (2023) as an executable model: arbiter cases, answers with rules and judgments

At a glance

FIDE Laws of Chess is an MCP server in the Legal & Government category. It runs locally over stdio via `npx -y @arxo/mcp-fide-chess`, and declares no required credentials. It scores A (80/100) on the MCP Skills Hub health score as of Oct 28, 2026.

Source 0

One-click install

VS Code VS Code Insiders Cursor

Opens your editor and pre-fills the config. Your editor will ask before adding it.

How to install FIDE Laws of Chess in your AI client

Setup for Claude Code, Claude Desktop, Cursor, Codex, Windsurf, Cline and VS Code — copy-paste ready.

How to install FIDE Laws of Chess in Claude CodeAnthropic's agentic CLI

Add the server

bash

claude mcp add fide-chess -- npx -y @arxo/mcp-fide-chess

2
Verify it's connected
bash
```
claude mcp list
```
Sharing it with your team?
Add `--scope project` to write it to .mcp.json in the repository root, which you can commit (with the secrets left as environment variables).
Use it in a session
Ask Claude to use the tools this server exposes. It discovers them automatically.

How to install FIDE Laws of Chess in Claude DesktopDesktop app (MCP config)

Open your MCP config
macOS: ~/Library/Application Support/Claude/claude_desktop_config.json · Windows: %APPDATA%\Claude\claude_desktop_config.json

Add this server

json

{
  "mcpServers": {
    "fide-chess": {
      "command": "npx",
      "args": [
        "-y",
        "@arxo/mcp-fide-chess"
      ]
    }
  }
}

Restart Claude Desktop
The tools appear under the 🔌 menu once the app reloads.

How to install FIDE Laws of Chess in CursorAI-first code editor

Create / edit .cursor/mcp.json in your project

json

{
  "mcpServers": {
    "fide-chess": {
      "command": "npx",
      "args": [
        "-y",
        "@arxo/mcp-fide-chess"
      ]
    }
  }
}

Enable it
Cursor Settings → MCP → toggle the server on. Tools become available to the Composer/Agent.

How to install FIDE Laws of Chess in Codex CLIOpenAI coding agent

Add to ~/.codex/config.toml

toml

[mcp_servers.fide-chess]
command = "npx"
args = ["-y", "@arxo/mcp-fide-chess"]

Run Codex
Codex loads MCP servers from config.toml on startup and exposes their tools to the agent.

How to install FIDE Laws of Chess in WindsurfCodeium's agentic IDE

Edit ~/.codeium/windsurf/mcp_config.json

json

{
  "mcpServers": {
    "fide-chess": {
      "command": "npx",
      "args": [
        "-y",
        "@arxo/mcp-fide-chess"
      ]
    }
  }
}

Reload
Windsurf → Cascade → refresh MCP servers. Cascade can now call the tools.

How to install FIDE Laws of Chess in ClineVS Code autonomous agent

Open Cline → MCP Servers → Configure
Adds to cline_mcp_settings.json.

Add the server

json

{
  "mcpServers": {
    "fide-chess": {
      "command": "npx",
      "args": [
        "-y",
        "@arxo/mcp-fide-chess"
      ]
    }
  }
}

How to install FIDE Laws of Chess in VS CodeCopilot / MCP support

Create .vscode/mcp.json

json

{
  "servers": {
    "fide-chess": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@arxo/mcp-fide-chess"
      ]
    }
  }
}

Start it
VS Code shows a ▶ Start action above the server entry. Agent mode (Copilot Chat) can then use the tools.

What does FIDE Laws of Chess need from you?

Configuration only — Declares config values but no credentials.

FIDE_CHESS_MCP_CALL_TIMEOUToptionalEnvironment variable
Per-call timeout in seconds for the local host (optional)

Pass secrets through your shell environment rather than committing them into a config file.

What tools does FIDE Laws of Chess expose?

This server runs as a local package. We only query remote servers for their tool list — asking this one would mean executing it, so its tools are listed in the documentation below.

What the code can do

Read from the published package source — never executed. Parsed 1 of 1 source file.

This server can run other programs on your machine, read and write files and read your environment variables.

How it was published

No provenance attestation — there is nothing linking this published artifact to a specific source commit.
1 npm maintainer — a single point of compromise · last published by arxo-owner.

Maintainer of this package and think something here is wrong? Tell us and we'll correct it.

Before you install

Signals gathered from the source repo and package registry — not a safety verdict.

What it can reach

Runs code on your machine — Executes as a local process with your user's permissions, including filesystem access.
Downloads at launch — The package is fetched from its registry each run unless you pin a version.

Last commit 2 days ago — Actively maintained.
Repository created 15 days ago — Very new project with little track record yet.
0 GitHub stars — Very little community usage so far.
88 weekly downloads — Very few installs — you would be an early user.

Client compatibility

Claude Code: NativeClaude Desktop: NativeCursor: NativeCodex CLI: NativeWindsurf: NativeCline: NativeVS Code: Native

Health score

A · 80

Maintenance, adoption, transparency and packaging — not a safety audit. How this is calculated

Maintenance30%100%
Last commit 2 days ago.
Adoption20%23%
0 stars, 88 weekly downloads.
Transparency20%75%
3/4: ✓ public source repo, ✓ declared license, ✓ documentation, ✗ discoverable tool list.
Provenance15%100%
Package and registry entry point at the same repository.
Packaging15%100%
Publishes a pinned version (0.1.1).

Documentation

Full README

FIDE Laws of Chess on Arxo

Explore a chess arbiter's decision through a pinned model, explicit facts and an inspectable answer. Ten retained fictional cases cover illegal moves, flag fall, rapid/blitz exceptions, recording and arbiter judgment.

Node.js 20+ · ESM · canon package 0.1.0 · model 0.1.1 · FIDE edition effective 1 January 2023

Start in Node.js · Cases · Evidence · Depth · Submit a case · Source repository

This is an independent open-source teaching and research demonstration. For an actual chess ruling, use the authentic FIDE Laws and the competent arbiter. Source text and model scope are pinned; the package does not claim general chess-engine capability or complete formalization.

Start in Node.js

Requirements: Node.js 20+. The example uses ES modules; keep the .mjs extension. This recipe was checked on macOS arm64 with Node.js 20.20.2 on 14 October 2026. No global CLI, Git clone or MCP client is needed for this route.

Create a fresh directory, open a terminal there, then run:

npm init -y
npm install --ignore-scripts @arxo/canon-fide-chess@0.1.0 @arxo/law@0.4.3

Save this as example.mjs, then run node example.mjs:

import { open } from '@arxo/law';
import { loadModel } from '@arxo/canon-fide-chess/chess';
import { game, white, getCaseInput } from '@arxo/canon-fide-chess/examples/arbiter';

const model = await loadModel();
const chess = await open(model.spec, {
  offline: true,
  local: { packages: { [model.spec]: model.package } },
});

const input = getCaseInput('SecondIllegal');
const loss = await chess.truth('game_lost_by', [game, white], input);
const draw = await chess.truth('game_drawn', [game], input);
console.log(loss.evaluationStatus, loss.truthStatus); // COMPUTED, TRUE_ONLY
console.log(draw.evaluationStatus, draw.truthStatus); // COMPUTED, NEITHER

The two output lines are loss, then draw:

text

COMPUTED TRUE_ONLY
COMPUTED NEITHER

COMPUTED means the query was evaluated. TRUE_ONLY means it has positive support and no negative support. NEITHER means neither polarity is supported; it does not establish that the proposition is false.

Excerpt — the full document is on GitHub.

Alternatives to FIDE Laws of Chess

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Shows its health grade, and links readers to install steps for every client.

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