CronSpell

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

Indexed tools

Tool metadata and schemas come from the remote server and are untrusted. Indexing only lists tools; it never calls them.

4 shown · authentication unknown

• List cron runs between two times

  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.

  Schema valid · SHA-256 bf15cf1b9503…

  View input schema

  {
    "type": "object",
    "properties": {
      "expression": {
        "type": "string",
        "minLength": 1,
        "maxLength": 200,
        "description": "Cron expression, e.g. \"0 9 * * 1-5\", \"*/15 * * * *\", \"0 30 8 * * *\" (6 fields = leading seconds) or \"@daily\"."
      },
      "timezone": {
        "type": "string",
        "minLength": 1,
        "maxLength": 64,
        "pattern": "^[A-Za-z0-9_+\\-/]+$",
        "default": "UTC",
        "description": "IANA time zone the schedule runs in, e.g. \"America/Denver\", \"Europe/London\". Default UTC."
      },
      "start": {
        "type": "string",
        "minLength": 1,
        "maxLength": 40,
        "description": "Window start (inclusive). ISO 8601 with Z or an offset (2026-11-01T09:00:00Z), a local time read in the time zone (2026-11-01T09:00), or unix seconds."
      },
      "end": {
        "type": "string",
        "minLength": 1,
        "maxLength": 40,
        "description": "Window end (inclusive). ISO 8601 with Z or an offset (2026-11-01T09:00:00Z), a local time read in the time zone (2026-11-01T09:00), or unix seconds."
      },
      "limit": {
        "type": "integer",
        "minimum": 1,
        "maximum": 100,
        "default": 20,
        "description": "Max runs to return (1-100)."
      }
    },
    "required": [
      "expression",
      "start",
      "end"
    ],
    "additionalProperties": false
  }

• Explain a cron expression

  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.