MCP server

CronSpell

dev.workers.mike-tusa.cronspell/cronspell

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

4

Token cost

About 1,167 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.cronspell]
url = "https://cronspell.mike-tusa.workers.dev/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"cronspell":{"type":"http","url":"https://cronspell.mike-tusa.workers.dev/mcp"}}}

Antigravity

agy mcp add cronspell https://cronspell.mike-tusa.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"cronspell","server_url":"https://cronspell.mike-tusa.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"cronspell","server_url":"https://cronspell.mike-tusa.workers.dev/mcp"}

Tools

• cron_runs_between ~388 tokens
  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.
• explain_cron ~191 tokens
  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 en
• next_cron_runs ~388 tokens
  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
• validate_cron ~200 tokens
  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.

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