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Cron Explainer MCP Server

by idoazacalls Your server? Claim it
answering

Cron Explainer is answering right now. Last checked 14 min ago. It exposes 1 tools. Last commit 23 Apr 2026.

Cron expression parser: explains any cron + returns next N fire times. Timezone-aware.

Uptime history 48 days of history
48 days agonow
100.0%
Uptime 24h
91 of 91 checks
1
Tools
read from the server
95 ms
Response time
average over 24h
0
Stars
last commit 23 Apr 2026

Nothing serious here today

Today is the operative word: we check Cron Explainer every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

run in your terminal
claude mcp add cron-explainer --transport http https://cron-explainer.cron-explainer-prod.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "cron-explainer": {
      "url": "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.cron-explainer]
url = "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "cron-explainer": {
      "url": "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "cron-explainer": {
      "url": "https://cron-explainer.cron-explainer-prod.workers.dev/mcp"
    }
  }
}

Available tools 1

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

explain
explain_cron
Parse a POSIX/Vixie cron expression and return the next N fire times plus an English description. Timezone-aware (IANA). Best-effort accuracy. Billed at 1 EUR cent per successful call; non-2xx responses are refunded.

Endpoints

URLTransportStateLatencyChecked
https://cron-explainer.cron-explainer-prod.workers.dev/mcp streamable-http answering 77 ms 14 min ago

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Cron Explainer — questions

Answers built from our own checks of this server.

What can Cron Explainer do?
It exposes 1 tools, read directly from the server on our last check. Among them: explain_cron. 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 Cron Explainer working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 95 ms. The bar chart above shows every period we have measured.
How do I connect Cron Explainer?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Cron Explainer need an API key?
No. Cron Explainer completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Cron Explainer?
It answers our handshake in 95 ms on average, which is faster than 84% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Cron Explainer open source?
Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.