Agent skill · software engineering · sundial-org
cron-writer
Convert natural language to cron expressions. Use when you need to schedule tasks.
Why this skill is useful
Adds a tool that converts natural language into cron expressions, which the AI wouldn't reliably generate on its own.
What it needs
About 2k tokens when loaded. Last updated 2026-03-07. 639 stars on the source repository.
What this skill does
Cron Writer Cron syntax is one of those things that looks simple until you actually need to write one. Five asterisks staring back at you and you can't remember which field is the day of week. This tool converts plain English like "every Tuesday at 3pm" into the exact cron expression. It even shows you the next few run times so you can verify it's right. One command. Zero config. Just works. Quick Start What It Does Converts plain English schedule descriptions to cron expressions Shows the human-readable meaning of the generated expression Lists the next scheduled run times for verification Handles complex schedules like "every other Friday" or "first Monday of each month" Works instantly with zero configuration Usage Examples Best Practices Verify with the next runs output - Always check the preview to make sure the schedule is what you wanted Be specific about time zones - Cron expressions don't include timezone info. Know what zone your server runs in Test edge cases - Schedules like "every other week" can be tricky. Double-check with the preview Copy directly into crontab - The output is ready to paste straight into your crontab or scheduler When to Use This Setting up a new cron job and can't remember the syntax Configuring CI/CD scheduled pipelines Building a task scheduler and need to validate cron expressions Documenting existing cron jobs in human-readable format Part of the LXGIC Dev Toolkit This is one of 110+ free developer tools built by LXGIC Studios. No paywalls, no sign-ups, no API keys on free tiers. Just tools that work. Find more: GitHub: https://github.com/LXGIC-Studios Twitter: https://x.com/lxgicstudios Substack: https://lxgicstudios.substack.com Website: https://lxgic.dev Requirements No install needed. Just run with npx. Node.js 18+ recommended. How It Works The tool sends your schedule description to an AI model that understands cron syntax and time patterns. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sundial-org/cron-writer