validate-schedule

validate-schedule is a command for Claude Code from rohitg00/awesome-claude-code-toolkit. It costs 0 tokens per session (340 once invoked), scanned A, original, Apache-2.0.

A command that checks a cron expression and explains when it will run. A cron expression is a compact schedule made from time fields.

In plain words
What is it for?
Use it to validate five- or six-field schedules, see upcoming run times, understand frequency, and compare expressions with common presets.
Why use it?
It helps catch invalid syntax, mistaken weekdays or months, timezone problems, and schedules that run more or less often than intended.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the cron-scheduler plugin — 2 commands shipped together

Good fit Use it to validate five- or six-field schedules, see upcoming run times, understand frequency, and compare expressions with common presets.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/rohitg00/awesome-claude-code-toolkit/validate-schedule
About the project

Awesome Claude Code Toolkit is a curated collection of extensions and configuration for Claude Code, including agents, skills, commands, plugins, hooks, rules, templates, MCP configurations, and companion apps. It is for Claude Code users who want ready-made workflows and integrations for different development tasks. The catalogue add-ons are selected components from this toolkit.

rohitg00/awesome-claude-code-toolkit · 2,598 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit

Made for: Claude Code.

Or install cron-scheduler, the plugin that ships this one along with the rest of its 2 commands.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for validate-schedule

README.md
[![agentmods](https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule/github.svg)](https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule)
Your own site
<a href="https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule"><img src="https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for validate-schedule

Your own site · 80×15
<a href="https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule"><img src="https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/validate-schedule.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 340 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.00340
Opus 5 $0.00000 $0.00170
Sonnet 5 $0.00000 $0.00068
Haiku 4.5 $0.00000 $0.00034

Measured 5d ago against content hash db421a2fd024, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

validate-schedule scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/cron-scheduler/commands/validate-schedule.md · 29 lines

What it actually says

/validate-schedule - Validate Cron Schedule

Validate and explain a cron schedule expression.

Steps

  1. Take the cron expression from the user (5 or 6 fields)
  2. Parse each field: minute, hour, day of month, month, day of week
  3. Validate syntax: check for valid ranges, step values, and special characters
  4. Detect common mistakes: day/month confusion, 0-indexed vs 1-indexed weekdays
  5. Translate the expression to plain English description
  6. Calculate the next 10 execution times based on the current date
  7. Calculate the frequency: how many times per day, week, month
  8. Identify potential issues: running too frequently, not running at expected times
  9. Check for timezone considerations and DST transition impacts
  10. Suggest alternative expressions if the schedule could be simplified
  11. Compare with common cron presets: @hourly, @daily, @weekly, @monthly
  12. Display a visual calendar showing execution times for the next 30 days

Rules

  • Support both 5-field (standard) and 6-field (with seconds) cron formats
  • Validate ranges: minutes (0-59), hours (0-23), days (1-31), months (1-12), weekdays (0-7)
  • Handle both numeric and named values for months and weekdays
  • Warn about expressions that run more than 100 times per day
  • Note timezone implications for jobs that span midnight or DST boundaries
  • Detect mutually exclusive day-of-month and day-of-week combinations
  • Support extended cron syntax: L (last), W (weekday), # (nth weekday)
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 29 lines · 0 tokens per session scan A db421a2fd024

Subscribe to this mod's changes

validate-schedule is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,598 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 340 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.