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AtCoder MCP Server

Registre officiel Recherche et web

Search AtCoder problems and fetch public problem statements through MCP.

Code source Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http atcoder-mcp-server 'https://api.ksrnyx.top/oj-mcp/atcoder/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "atcoder-mcp-server": {
            "type": "http",
            "url": "https://api.ksrnyx.top/oj-mcp/atcoder/mcp"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. AtCoder MCP Server
  2. Quick Start
  3. What It Can Do
  4. Run Locally
  5. Availability
  6. Source and Safety
  7. Platform Rules
  8. Development
  9. License

AtCoder MCP Server

简体中文

Find and read past AtCoder problems through MCP, locally or over hosted HTTP.

Quick Start

Add the hosted server to your MCP configuration:

{
  "servers": {
    "atcoder": {
      "type": "http",
      "url": "https://api.ksrnyx.top/oj-mcp/atcoder/mcp"
    }
  }
}

The endpoint accepts anonymous read requests. It does not need an API key, Cookie, or judge account.

Then ask:

Fetch AtCoder problem abc086_a and show its samples.

What It Can Do

ToolPurpose
oj_capabilitiesReport the available AtCoder read operations and transport.
oj_healthReport process readiness and the latest upstream read.
oj_fetch_problemFetch one past problem by canonical URL or contest/task id.
oj_search_problemsResolve an exact task URL or contest/task identifier.

Run Locally

Requires Node.js 22 or newer.

npm ci
npm run check
npm run build
node packages/atcoder/dist/index.js

MCP client configuration from a source checkout:

{
  "servers": {
    "atcoder": {
      "type": "stdio",
      "command": "node",
      "args": ["/absolute/path/packages/atcoder/dist/index.js"]
    }
  }
}

Tagged GitHub releases attach a standalone npm tarball.

Availability

  • Hosted MCP: https://api.ksrnyx.top/oj-mcp/atcoder/mcp
  • Official MCP Registry: io.github.ketherworks/atcoder, described by server.json
  • Health status: see the repository homepage or call oj_health

Source and Safety

This standalone release is generated from the reviewed Competitive Programming MCP source. The release package bundles the shared OJ contract implementation, so its runtime does not depend on unpublished workspace packages.

Platform Rules

Do not use this server during ongoing ABC, ARC, or AGC contests. AtCoder's current generative-AI rules generally prohibit that use. This project is intended for practice with past problems. It is unofficial and is not affiliated with or endorsed by AtCoder Inc. Problem content remains subject to the AtCoder Terms of Use.

The server exposes no run or submit tool. It accepts no judge account credentials. See SECURITY.md for the security boundary and PROVENANCE.md for the canonical source revision.

Development

npm ci
npm run check
npm run pack:check
npm run deploy:dry

License

Adapter source code is MIT licensed. Judge problem content and trademarks are not relicensed by this repository.

Questions fréquentes

Qu'est-ce que AtCoder MCP Server ?

Search AtCoder problems and fetch public problem statements through MCP.

Comment installer AtCoder MCP Server ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport http atcoder-mcp-server 'https://api.ksrnyx.top/oj-mcp/atcoder/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour AtCoder MCP Server ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

AtCoder MCP Server est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient AtCoder MCP Server ?

Il est publié par ketherworks. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.