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CronSpell

by dev.workers.mike-tusa.cronspell
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Server Details

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

Ownership verified
Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
ChatGPT
–
Claude
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TDQS

A4/5.0

Scored across 4 tools

Disambiguation5/5

Each tool has a clearly distinct purpose: validation, explanation, relative next/previous runs, and absolute runs between two dates. The two run-listing tools overlap slightly in that both return execution times, but their boundaries are explicit and easy to distinguish.

Naming Consistency3/5

All names use snake_case and include 'cron', which keeps them readable, but they mix verb-first names (explain_cron, validate_cron) with noun-first names (cron_runs_between, next_cron_runs). The pattern is recognizable but not consistent.

Tool Count5/5

Four tools is well-scoped for a cron-expression utility server. Each tool covers a distinct operation—validate, explain, next/previous, and between—and none feels redundant or gratuitous.

Completeness5/5

The surface covers the core lifecycle of working with cron expressions: validation, plain-English explanation, upcoming/past execution times, and execution times within a date range. There are no obvious dead ends for the stated domain.

Available Tools

4 tools
cron_runs_betweenList cron runs between two timesA
Read-onlyIdempotent
Inspect

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.

Inputs: end (required), start (required), expression (required), limit, +1 more. Returns: end, runs, notes, start, +7 more

explain_cronExplain a cron expressionA
Read-onlyIdempotent
Inspect

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.

Inputs: expression (required). Returns: notes, format, version, expression, +3 more

next_cron_runsList next (or previous) cron run timesA
Read-onlyIdempotent
Inspect

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.

Inputs: expression (required), from, count, timezone, +1 more. Returns: from, runs, notes, version, +6 more

validate_cronValidate a cron expressionA
Read-onlyIdempotent
Inspect

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.

Inputs: expression (required). Returns: error, valid, fields, format, +5 more

Tool Schema Changelog

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