AtCoder MCP Server

io.github.ketherworks/atcoder

Search AtCoder problems and fetch public problem statements through MCP.

healthy

status

tools exposed

831ms

connect latency

73dab127c5a0

schema fingerprint

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.

Endpoint

https://api.ksrnyx.top/oj-mcp/atcoder/mcp
Category: Dev & Git · Last checked: 2026-07-30T13:55:58Z

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Get alerted the moment yours goes down, a tool schema drifts, or an upstream silently breaks.

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How we measure →

What this means. This server responded to the MCP handshake and listed its tools without authentication. The schema fingerprint lets us flag if tool signatures silently change (schema drift) between checks.