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100
MCP live MCP 2025-11-25 streamable-http

AtCoder MCP Server

io.github.ketherworks/atcoder

Search AtCoder problems and fetch public problem statements through MCP.

Watch this dependency

Get before/after evidence when observed tools, schemas, authentication access, availability or the endpoint changes.

Inspect evidence and set up a watch Share public evidence report
Uptime
100.0%
5 direct probes · 30d
Response
1126ms
last probe
Tools
4
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://api.ksrnyx.top/oj-mcp/atcoder/mcp
Score: 100/100
Handshake verified by our own probe.
why this score
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
4 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
4 items in total; 3 or more earns these points.
pass Describes itself 10/10
72 characters; more than 30 earns these points.

Tools · 4

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.

How to use

Add to your Claude Desktop / Cursor / Cline MCP config:

{
  "mcpServers": {
    "atcoder_mcp_server": {
      "url": "https://api.ksrnyx.top/oj-mcp/atcoder/mcp",
      "transport": "streamable-http"
    }
  }
}