MCP server

FIDE Laws of Chess

io.arxo/fide-chess

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

arxo.io (verified by the MCP Registry)

Status

Working at last check

Tools

16

Token cost

About 8,638 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http fide-chess https://mcp.arxo.io/mcp/fide-chess

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.fide-chess]
url = "https://mcp.arxo.io/mcp/fide-chess"

Gemini CLI

{"mcpServers":{"fide-chess":{"httpUrl":"https://mcp.arxo.io/mcp/fide-chess"}}}

Cursor

{"mcpServers":{"fide-chess":{"url":"https://mcp.arxo.io/mcp/fide-chess"}}}

VS Code

{"servers":{"fide-chess":{"type":"http","url":"https://mcp.arxo.io/mcp/fide-chess"}}}

Antigravity

agy mcp add fide-chess https://mcp.arxo.io/mcp/fide-chess

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"fide-chess","server_url":"https://mcp.arxo.io/mcp/fide-chess","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"fide-chess","server_url":"https://mcp.arxo.io/mcp/fide-chess"}

Tools

• law_ask ~2130 tokens
  Put a question to formalised law. When the answer is "not established" it carries whyNot — the engine's why_not report: the candidate rules and the state of every conjunct (satisfied / not satisfied / undetermined); the missing facts are visible there and need not be guessed. BEFORE THE FIRST call o
• law_case_ask ~648 tokens
  The ask operation: run a registered case of a case package over its pinned dependencies and return the answer: by default a projection of the evaluation document without the proof graph, on responseMode full or proof: true the canonical document with a proof and a manifest. The question is JSON per
• law_inspect ~554 tokens
  Evaluation inspector over a SAVED evaluation document: summary — the origin card, resultHash and snapshot verification, listings of results, positions and issues; slice — the closure of proof nodes for a query, rule, position or node with addresses, both sides of BOTH, defeats, values, names resolve
• law_prepare_answer ~636 tokens
  At the explicit request of the user, repeat between 1 and 12 earlier law_ask or law_process_run calls, compare their replayControl strictly, and prepare a non-public frozen document for 24 hours. The client never supplies the machine answer: the server obtains it only by executing afresh. A divergen
• law_query ~1058 tokens
  A deterministic LawQL query over the CLIR of a formalization: a question about the model of the act itself, not about a case. Relations (14): anchors, edges, fields, imports, interpretations, labels, links, literals, nodes, norms, positions, rules, variables, windows. Full field lists: `law query --
• law_screen ~386 tokens
  Build a necessary condition — a superset — for the preliminary selection of rows from an external source. This is NOT a legal answer and NOT SQL: the result is a typed tree and a manifest of the extensions up to TRUE. Every row that passes must then be computed in full by the engine, with a proof gr
• law_search ~311 tokens
  A semantic SEARCH over formalised law: a question or a notion in your own words → candidates with addresses — predicates with signatures, rules, article fragments. This is the layer of DISCOVERY, not of the answer: the result says WHAT to ask next (law_ask by signature, law_rules, law_sources) and e

Browse

• Notion tools
• Calendars
• Notes and wikis
• Hiring and jobs
• Legal research

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