Cron Schedule Lint for crontab, Kubernetes CronJob, GitHub Actions, Spring and EventBridge

Runs the same checker as the npm package @readystack/cron-schedule-lint on a Node.js runtime that pip installs for you (nodejs-wheel-binaries) - no system Node.js needed. Your files are checked locally.

Names every schedule line in the file you have open that fires at the wrong hour, twice, or never at all - and prints the next three times each one really fires, in the zone that actually applies.

Install

cron-schedule-lint file

Node 18+. The same 29 rules as the VS Code extension, from a terminal or CI.

Free

• Checks the file you have open against all 29 rules and, for every schedule line, prints the next three instants it really fires at, how many times it fires in a year, and the exact dates when that wall-clock time does not exist or happens twice - no key, no limit, no watermark.
• --rules lists every rule

With a licence ($29 once)

• Merges every schedule in the repository into one calendar instead of the single file you have open, exports it as CSV, JSON or HTML for a change review, and writes machine output a CI step can fail on so a merge cannot add a schedule that never fires.

@readystack/cron-schedule-lint --dir ./templates --report html --out report.html

Healthchecks.io Business, the ordinary cron monitor, is $20 every month for 100 jobs - $240 a year, forever - and by design it can only tell you after a run was already missed.

Use from an AI agent (MCP)

Claude Code · Cursor · Windsurf · any MCP client - add to your MCP config:

{ "mcpServers": { "cron-schedule-lint": { "command": "npx", "args": ["-y", "@readystack/cron-schedule-lint", "--mcp"] } } }

Tools: check_text and check_file (free) · check_dir (licence). The agent gets every finding with the line number.

Use in CI

- name: Cron Schedule Lint for crontab, Kubernetes CronJob, GitHub Actions, Spring and EventBridge
  run: npx -y @readystack/cron-schedule-lint --dir . --ci

(container: docker run --rm -v "$PWD:/work" getreadystack/cron-schedule-lint --dir /work --ci)

The folder sweep, reports and CI mode need one licence — one payment, no subscription. Set READYSTACK_LICENSE=<key> or run --license <key> once.

Get a licence

Install (PyPI)

pip install readystack-cron-schedule-lint
cron-schedule-lint --help