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Independent measurements of remote MCP servers. Every observation has a timestamp.

Read-only probes

AtCoder MCP Server

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io.github.ketherworks/atcoder

ketherworksVerified

Search AtCoder problems and fetch public problem statements through MCP.

Search & web data

Developer ToolsIs AtCoder MCP Server down?Alternatives

13 of 22 checks passed

  • Handshake
  • Tools listed
  • Updated recently

Responded

The server completed its last measured handshake. This is an observation, not a guarantee.

Connect to server
Median latency
659 ms
Uptime, 30 days
Not measured
Last checked

Measurement details

Core

  • Pass
    Reachable

    Latest probe returned HTTP 200 in 659 ms.

  • Pass
    Valid handshake

    protocolVersion 2025-11-25, serverInfo.name atcoder-mcp-server.

  • Pass
    Lists tools

    tools/list returned 4 tools.

  • Pass
    Current protocol

    Negotiated 2025-11-25. The bar is 2025-06-18 or newer.

  • Pass
    HTTPS

    The endpoint URL is https.

Performance

  • Not measured
    Fast (p50)

    Median latency 659 ms over 1 samples in 7 days. The bar is 1000 ms. Need at least 5 samples.

  • Not measured
    Consistent (p95)

    95th percentile 659 ms over 1 samples in 7 days. The bar is 3000 ms. Need at least 20 samples.

  • Not measured
    Reliable (uptime)

    1 of 1 attempts returned a tool list in 30 days (100%). The bar is 99%. Need at least 30 samples.

  • Not measured
    Stable tool list

    Fewer than two successful probes in 30 days, so tool-list stability is not measured.

Access

  • Pass
    Open access

    tools/list succeeded with no credential, and the record declares none.

  • Not measured
    Standard auth

    Auth is not required, so the OAuth metadata check does not apply.

  • Not measured
    Free tier cited

    No publisher quote has been checked.

Tools

  • Pass
    Tools described

    Every tool description is at least 20 characters.

  • Pass
    Valid input schemas

    Every inputSchema is a JSON Schema object.

  • Fail
    Parameters documented

    0 of 6 parameters have a description (0%). The bar is 80%.

  • Pass
    Safety hints

    Every tool sets readOnlyHint or destructiveHint.

Publisher

  • Pass
    Verified namespace

    Listed in the Official MCP Registry.

  • Not measured
    Website matches publisher

    This namespace is not a reverse domain, so the website comparison does not apply.

  • Pass
    Source repo linked

    A repository URL is on file.

  • Pass
    Repo owner matches

    The GitHub repository owner matches the namespace login.

  • Pass
    Recently updated

    Updated 2026-07-21T15:57:02.838406Z, within 180 days.

  • Not measured
    Open-source licence

    The GitHub licence lookup has not returned an OSI result yet.

Tools

  • oj_capabilities

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

    Measured

  • 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.

    Measured

  • oj_health

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

    Measured

  • 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.

    Measured

Probe history

  • ok659 ms4 tools

Status and uptime

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The image links back to this page. It shows checks passed, or uptime, and the colour follows the latest status. Responses are cached for 5 to 15 minutes.

MCP Heartbeat badge

Markdown

[![MCP Heartbeat](https://mcpheartbeat.com/badge/io.github.ketherworks/atcoder.svg)](https://mcpheartbeat.com/s/io.github.ketherworks/atcoder)

HTML

<a href="https://mcpheartbeat.com/s/io.github.ketherworks/atcoder"><img alt="MCP Heartbeat" src="https://mcpheartbeat.com/badge/io.github.ketherworks/atcoder.svg"></a>

Uptime markdown

[![MCP Heartbeat uptime](https://mcpheartbeat.com/badge/io.github.ketherworks/atcoder.svg?kind=uptime)](https://mcpheartbeat.com/s/io.github.ketherworks/atcoder)

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Connect to this server

Claude Code

claude mcp add --transport http atcoder-mcp-server https://api.ksrnyx.top/oj-mcp/atcoder/mcp

Cursor .cursor/mcp.json

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

VS Code .vscode/mcp.json

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