CronSpell
Validate and explain cron expressions; list next/previous run times in any time zone, DST-aware.
我该使用它吗
质量与安全性
A
基于对工具定义和协议合规性的自动分析。
上下文开销
~1,817token 数（工具定义）
~3.6 KB典型响应大小
对注意力有中等影响（占 128k 上下文窗口的 1.42%）
这是每次将服务器的工具加载到模型上下文窗口时所消耗的大致 token 数。数值越高，可用于其他任务的注意力就越少。
安装
一键安装
将以下内容添加到你的 `claude_desktop_config.json` 文件中：
{
"mcpServers": {
"cronspell": {
"url": "https://cronspell.mike-tusa.workers.dev/mcp"
}
}
}远程端点
https://cronspell.mike-tusa.workers.dev/mcpstreamable-http它能做什么
工具清单
工具（4）
🟢 只读🟡 写入🔴 删除⚪ 未知
🟢validate_cron(expression)
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.
输入模式
{
"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\"."
}
},
"required": [
"expression"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"valid": {
"type": "boolean"
},
"expression": {
"type": "string"
},
"normalized": {
"type": "string"
},
"format": {
"type": "string",
"enum": [
"standard",
"seconds",
"shorthand"
]
},
"dayMatching": {
"type": "string",
"enum": [
"or",
"and"
]
},
"fields": {
"type": "object"
},
"description": {
"type": "string"
},
"error": {
"type": "object",
"properties": {
"code": {
"type": "string"
},
"message": {
"type": "string"
},
"field": {
"type": "string"
}
},
"required": [
"code",
"message"
]
},
"version": {
"type": "string"
}
},
"required": [
"valid",
"expression",
"version"
]
}🟢explain_cron(expression)
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.
输入模式
{
"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\"."
}
},
"required": [
"expression"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"expression": {
"type": "string"
},
"normalized": {
"type": "string"
},
"description": {
"type": "string"
},
"format": {
"type": "string"
},
"dayMatching": {
"type": "string"
},
"notes": {
"type": "array",
"items": {
"type": "string"
}
},
"version": {
"type": "string"
}
},
"required": [
"expression",
"description",
"version"
]
}🟢next_cron_runs(expression, timezone, count, from, direction)
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.
输入模式
{
"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."
},
"count": {
"type": "integer",
"minimum": 1,
"maximum": 20,
"default": 5,
"description": "How many runs (1-20)."
},
"from": {
"type": "string",
"maxLength": 40,
"description": "Start point (exclusive); default now. 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."
},
"direction": {
"type": "string",
"enum": [
"next",
"previous"
],
"default": "next",
"description": "\"next\" (default) or \"previous\" (most recent first)."
}
},
"required": [
"expression"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"expression": {
"type": "string"
},
"normalized": {
"type": "string"
},
"timezone": {
"type": "string"
},
"description": {
"type": "string"
},
"runs": {
"type": "array",
"items": {
"type": "object",
"properties": {
"time": {
"type": "string",
"description": "Local ISO 8601 time with UTC offset"
},
"utc": {
"type": "string"
},
"unix": {
"type": "number"
},
"weekday": {
"type": "string"
},
"offset": {
"type": "string"
},
"dst": {
"type": "string",
"enum": [
"repeated"
]
}
},
"required": [
"time",
"utc",
"unix",
"weekday",
"offset"
]
}
},
"complete": {
"type": "boolean"
},
"notes": {
"type": "array",
"items": {
"type": "string"
}
},
"version": {
"type": "string"
},
"from": {
"type": "string"
},
"direction": {
"type": "string"
}
},
"required": [
"expression",
"timezone",
"runs",
"complete",
"notes",
"version"
]
}🟢cron_runs_between(expression, timezone, start, end, limit)
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.
输入模式
{
"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
}输出模式
{
"type": "object",
"properties": {
"expression": {
"type": "string"
},
"normalized": {
"type": "string"
},
"timezone": {
"type": "string"
},
"description": {
"type": "string"
},
"runs": {
"type": "array",
"items": {
"type": "object",
"properties": {
"time": {
"type": "string",
"description": "Local ISO 8601 time with UTC offset"
},
"utc": {
"type": "string"
},
"unix": {
"type": "number"
},
"weekday": {
"type": "string"
},
"offset": {
"type": "string"
},
"dst": {
"type": "string",
"enum": [
"repeated"
]
}
},
"required": [
"time",
"utc",
"unix",
"weekday",
"offset"
]
}
},
"complete": {
"type": "boolean"
},
"notes": {
"type": "array",
"items": {
"type": "string"
}
},
"version": {
"type": "string"
},
"start": {
"type": "string"
},
"end": {
"type": "string"
},
"truncated": {
"type": "boolean"
}
},
"required": [
"expression",
"timezone",
"runs",
"truncated",
"notes",
"version"
]
}社区
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