MCP server

AtCoder MCP Server

io.github.ketherworks/atcoder

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

Search AtCoder problems and fetch public problem statements through MCP.

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

4

Token cost

About 714 tokens per request

Sets up in

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

Last checked

25 Oct 2026, 20:29 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 atcoder https://api.ksrnyx.top/oj-mcp/atcoder/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.atcoder]
url = "https://api.ksrnyx.top/oj-mcp/atcoder/mcp"

Gemini CLI

{"mcpServers":{"atcoder":{"httpUrl":"https://api.ksrnyx.top/oj-mcp/atcoder/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add atcoder https://api.ksrnyx.top/oj-mcp/atcoder/mcp

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":"atcoder","server_url":"https://api.ksrnyx.top/oj-mcp/atcoder/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"atcoder","server_url":"https://api.ksrnyx.top/oj-mcp/atcoder/mcp"}

Tools

• oj_capabilities ~76 tokens
  Report the audited anonymous AtCoder read surface and explicitly unsupported operations.
• oj_fetch_problem ~358 tokens
  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_health ~77 tokens
  Report local readiness and the latest observed AtCoder page-read status without probing upstream.
• oj_search_problems ~203 tokens
  Resolve exactly one contest/task id, atcoder:contest/task id, or canonical task URL. Free-text and catalog crawling are not supported.

Browse

• GitHub tools
• Web scraping
• GitHub and code hosting

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