Codeforces MCP Server

by ketherworks Your server? Claim it

not responding

Codeforces MCP Server is listed as active in the registry but did not answer our last check. It exposes 4 tools. Last commit 8 Sep 2026.

Search Codeforces problems and inspect public problem metadata through the official Codeforces API.

Uptime history 91 days of history · worst day 0%

91 days agonow

0.0%

Uptime 24h

0 of 91 checks

Tools

read from the server

52 ms

Response time

average over 24h

Stars

last commit 8 Sep 2026

Codeforces MCP Server does not always answer

Over the last week it answered 0.0% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add codeforces --transport http https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp

Settings → Connectors → Add custom connector, then paste this address

https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp

~/.codex/config.toml

[mcp_servers.codeforces]
url = "https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "codeforces": {
      "url": "https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "codeforces": {
      "type": "http",
      "url": "https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

capabilities

oj_capabilities

Report audited Codeforces official API capabilities and unsupported operations.

codeforces

codeforces_get_problem_metadata

Get official metadata only. This tool does not return a problem statement or submit code.

health

oj_health

Return passive transport, schema, and persisted Codeforces upstream health.

problems

oj_search_problems

Search official Codeforces problem metadata by id, title, or tag.

Endpoints

URL	Transport	State	Latency	Checked
https://codeforces-oj-mcp.lantangtang54.workers.dev/mcp	streamable-http	answering	52 ms	13 min ago

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Codeforces MCP Server — questions

Answers built from our own checks of this server.

What can Codeforces MCP Server do?

It exposes 4 tools, read directly from the server on our last check. Among them: codeforces_get_problem_metadata, oj_capabilities, oj_health, oj_search_problems. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Codeforces MCP Server working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 52 ms. The bar chart above shows every period we have measured.

The registry lists Codeforces MCP Server as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect Codeforces MCP Server?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Codeforces MCP Server need an API key?

No. Codeforces MCP Server completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

Is Codeforces MCP Server open source?

The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at codeforces-oj-mcp.lantangtang54.workers.dev, which runs on its operator's own terms.