AtCoder MCP Server

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

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

4 tools

• oj_capabilities

  Report the audited anonymous AtCoder read surface and explicitly unsupported operations.

• oj_health

  Report local readiness and the latest observed AtCoder page-read status without probing upstream.

• oj_fetch_problem

  Fetch one public problem statement from an exact contest/task pair or canonical atcoder.jp task URL. Returns sanitized HTML with preserved math, samples, limits, hashes, and source provenance.

• oj_search_problems

  Resolve exactly one contest/task id, atcoder:contest/task id, or canonical task URL. Free-text and catalog crawling are not supported.

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