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Cron Parser

lazymac2x/cron-parser-api

A Cloudflare Workers based MCP server that parses and manipulates cron expressions through a streamable HTTP interface. Exposes operations to explain cron syntax in plain English, validate expressions, generate the next N run times, create cron strings from structured descriptions (like "every day at 9am"), and list common patterns. Useful when you need Claude to schedule tasks, interpret existing cron jobs, or help users build schedules without memorizing cron syntax. The underlying API supports standard 5-field cron plus presets like @daily and @weekly. Runs as a remote service at api.lazy-mac.com, so no local installation needed beyond MCP configuration.

tools
6
transport
HTTP
last updated
May 16, 2026
View on GitHub

Install

From registry metadata
$ npx add-mcp https://api.lazy-mac.com/cron-parser/mcp --name cron-parser

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http cron-parser https://api.lazy-mac.com/cron-parser/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 6 tools

Verified live against the running server on Nov 6, 2026.

explain_cronExplain a cron expression in human-readable form and show parsed fields. Supports @presets like @daily, @weekly.1 params

Explain a cron expression in human-readable form and show parsed fields. Supports @presets like @daily, @weekly.

Parameters* required
expression*string
Cron expression (e.g. "*/5 * * * *" or "@daily")
validate_cronCheck if a cron expression is valid. Returns {valid: bool, error?: string}.1 params

Check if a cron expression is valid. Returns {valid: bool, error?: string}.

Parameters* required
expression*string
Cron expression to validate
next_runsGet the next N scheduled run times for a cron expression. Uses standard Unix OR semantics for day fields.3 params

Get the next N scheduled run times for a cron expression. Uses standard Unix OR semantics for day fields.

Parameters* required
countnumber
Number of next runs to return (1-20, default 5)
expression*string
Cron expression
fromstring
ISO 8601 start date (default: now)
generate_cronGenerate a cron expression from human-friendly options.4 params

Generate a cron expression from human-friendly options.

Parameters* required
atobject
every*string
Frequencyone of minute · hour · day · week · month
monthnumber
Month (1-12)
onobject
diff_cronCompare two cron expressions and return per-field differences.2 params

Compare two cron expressions and return per-field differences.

Parameters* required
first*string
First cron expression
second*string
Second cron expression
common_cronsList commonly used cron expressions with descriptions.

List commonly used cron expressions with descriptions.

No parameters. Call it with no arguments.

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Readme

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cron-parser-api

⭐ Building in public from $0 MRR. Star if you want to follow the journey — lazymac-mcp (42 tools, one MCP install) · lazymac-k-mcp (Korean wedge) · lazymac-sdk (TS client) · api.lazy-mac.com · Pro $29/mo.

View the full README on GitHub

Details

Repository
github.com/lazymac2x/cron-parser-api
Categories
Cloud & Infrastructure, Automation & Workflows
Transport
HTTP
Registry
MCP registry, active
Tools verified
Nov 6, 2026

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