CronSpell

dev.workers.mike-tusa.cronspell/cronspellVersion 0.1.0

Validate and explain cron expressions; list next/previous run times in any time zone, DST-aware.

Status

Responds145 msNov 14, 2026, 14:28 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:28 UTC
Latency: 145 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://cronspell.mike-tusa.workers.dev/mcpResponds145 msNov 14, 2026, 14:28 UTC

No sign-in

Claude Code

claude mcp add --transport http cronspell https://cronspell.mike-tusa.workers.dev/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: cronspell
Remote MCP server URL: https://cronspell.mike-tusa.workers.dev/mcp

Cursor

{
  "mcpServers": {
    "cronspell": {
      "url": "https://cronspell.mike-tusa.workers.dev/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"cronspell","type":"http","url":"https://cronspell.mike-tusa.workers.dev/mcp"}'

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Tools

4 tools

Tools of CronSpell
	Description		Read-only	Idempotent	Open world
`cron_runs_between`List 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 /api/between.	List 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 /api/between.	No	Yes	Yes	No
`explain_cron`Explain 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 expansion). Invalid expressions return isError with the reason. Read-only. Same engine as GET /api/explain.	Explain 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 expansion). Invalid expressions return isError with the reason. Read-only. Same engine as GET /api/explain.	No	Yes	Yes	No
`next_cron_runs`List 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. Default 5 runs, max 20; searches up to 50 years. Read-only. Same engine as GET /api/next and GET /api/previous.	List 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. Default 5 runs, max 20; searches up to 50 years. Read-only. Same engine as GET /api/next and GET /api/previous.	No	Yes	Yes	No
`validate_cron`Check 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 code, the field at fault and a message. Detects schedules that can never run (e.g. February 30). Read-only. Same engine as GET /api/validate.	Check 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 code, the field at fault and a message. Detects schedules that can never run (e.g. February 30). Read-only. Same engine as GET /api/validate.	No	Yes	Yes	No

Details

Registry status: Active
Published: Oct 22, 2026
Updated: Oct 22, 2026
Website: https://cronspell.mike-tusa.workers.dev/⁠ (opens in a new tab)
Repository: Not given
Categories: Uncategorized
GDPR: Not declared

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