CronSpell
by cronspell.mike-tusa.workers.dev · dev.workers.mike-tusa.cronspell/cronspell
Validate and explain cron expressions; list next/previous run times in any time zone, DST-aware.
- Category
- Other
- Connection
- Remote (HTTP)
- Tools
- 4 reported
- Status
- Online
Connect it to your AI
Claude Code
claude mcp add --transport http cronspell https://cronspell.mike-tusa.workers.dev/mcpClaude, ChatGPT, Cursor and other apps
Add it as a custom connector with this URL (Streamable HTTP):
https://cronspell.mike-tusa.workers.dev/mcpCursor, VS Code and other apps (mcp.json)
{
"mcpServers": {
"cronspell": {
"url": "https://cronspell.mike-tusa.workers.dev/mcp"
}
}
}Tools it offers
4 tools, as the server itself reported during our check on Oct 31, 2026.
validate_cronCheck whether a cron expression is valid. Returns valid true with the expanded values of every field (minute, hour, day of month, month, day of week, and seconds for 6-field expressions), or valid false with an error codexplain_cronExplain a cron expression in plain English, e.g. "0 9 * * 1-5" → "At 09:00, on Monday through Friday." Also returns notes on cron rules that often surprise people (day-of-month OR day-of-week, seconds field, shorthand exnext_cron_runsList the next (or, with direction "previous", the most recent past) run times of a cron expression in an IANA time zone, DST-aware. Each run has the local time with its UTC offset, the UTC time, unix seconds and weekday.cron_runs_betweenList every run of a cron expression between start and end (both inclusive) in an IANA time zone, DST-aware, oldest first. Default limit 20, max 100; truncated is true when there are more. Read-only. Same engine as GET /a
Questions
What is the CronSpell MCP server?
Validate and explain cron expressions; list next/previous run times in any time zone, DST-aware. It is made by cronspell.mike-tusa.workers.dev and listed in the official MCP Registry as dev.workers.mike-tusa.cronspell/cronspell. MCP (Model Context Protocol) is the open standard that lets AI apps like Claude, ChatGPT and Cursor use outside tools.
How do I add CronSpell to Claude?
In the Claude app or claude.ai, open Settings, then Connectors, choose "Add custom connector" and paste https://cronspell.mike-tusa.workers.dev/mcp. In Claude Code, run: claude mcp add --transport http cronspell https://cronspell.mike-tusa.workers.dev/mcp
How do I add CronSpell to ChatGPT?
ChatGPT can use remote MCP servers as connectors. In ChatGPT settings, under Apps and Connectors, turn on developer mode if asked, create a new connector and paste https://cronspell.mike-tusa.workers.dev/mcp.
How do I add CronSpell to Cursor?
Open Cursor settings, go to MCP, choose "Add new MCP server" (or edit ~/.cursor/mcp.json) and add: { "mcpServers": { "cronspell": { "url": "https://cronspell.mike-tusa.workers.dev/mcp" } } }
Does CronSpell work right now?
Yes. It responded when we last checked on 31 Oct 2026. We check remote MCP servers every day.
What can CronSpell do?
It gives your AI 4 tools, including validate_cron, explain_cron, next_cron_runs, cron_runs_between. The full list is on this page.
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Markdown (GitHub README)
[](https://chen.media/mcp/dev-workers-mike-tusa-cronspell-cronspell)HTML (switches to dark mode on its own)
<a href="https://chen.media/mcp/dev-workers-mike-tusa-cronspell-cronspell"><picture><source media="(prefers-color-scheme: dark)" srcset="https://chen.media/mcp/badge/dev-workers-mike-tusa-cronspell-cronspell.svg?theme=dark"><img src="https://chen.media/mcp/badge/dev-workers-mike-tusa-cronspell-cronspell.svg" alt="Listed on chen.media/mcp" height="40"></picture></a>More in Other
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