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Crontab Validator

Name: Crontab Validator
Author: charlie-morrison

作者 charlie-morrison · GitHub ↗ · v1.0.0 · MIT-0

cross-platform ✓ 安全检测通过

总下载

当前安装

版本数

在 OpenClaw 中安装

/install crontab-validator

功能描述

Validate, explain, lint, and calculate next run times for cron expressions. Use when asked to check cron syntax, explain a crontab entry, find next scheduled...

使用说明 (SKILL.md)

Crontab Validator & Explainer

Validate cron syntax, get human-readable explanations, calculate next run times, and lint for common mistakes.

Validate

# Single expression
python3 scripts/cron_check.py validate "*/15 * * * *"

# Multiple expressions with lint
python3 scripts/cron_check.py validate --lint "0 2 * * *" "* * * * *" "0 0 31 2 *"

Explain in Detail

python3 scripts/cron_check.py explain "30 4 1,15 * 1-5"

Next Run Times

# Next 5 runs (default)
python3 scripts/cron_check.py next "0 9 * * 1-5"

# Next 10 runs
python3 scripts/cron_check.py next "0 */6 * * *" --count 10

# From specific time
python3 scripts/cron_check.py next "0 9 * * *" --from-time 2026-01-01T00:00:00

Lint

# Check for common mistakes
python3 scripts/cron_check.py lint "* * * * *" "0 0 31 2 *" "0 0 29 2 *"

# Strict mode (exit 1 on warnings)
python3 scripts/cron_check.py lint --strict "0 0 31 4 *"

Output Formats

python3 scripts/cron_check.py -f json explain "0 9 * * 1-5"
python3 scripts/cron_check.py -f markdown validate --lint "*/5 * * * *"

Supported Syntax

Feature	Example	Description
Wildcard	`*`	Every value
Specific	`5`	Exact value
Range	`1-5`	Values 1 through 5
List	`1,3,5`	Values 1, 3, and 5
Step	`*/15`	Every 15th value
Range+Step	`1-30/2`	Odd values 1-30
Names	`mon-fri`	Day/month names
Shortcuts	`@daily`	Predefined schedules

Shortcuts

Shortcut	Equivalent	Meaning
`@yearly`	`0 0 1 1 *`	Once a year
`@monthly`	`0 0 1 * *`	First of month
`@weekly`	`0 0 * * 0`	Every Sunday
`@daily`	`0 0 * * *`	Every midnight
`@hourly`	`0 * * * *`	Every hour

Lint Checks

Check	Level	Description
Every-minute	Warning	`* * * * *` runs 1440 times/day
Day 31 in short months	Warning	Apr, Jun, Sep, Nov have 30 days
Feb 29-31	Warning	Only runs in leap years (29) or never
DOM + DOW conflict	Info	Both specified = OR logic
High frequency	Info	More than 288 runs/day

安全使用建议

This skill is a local Python-based cron-expression linter/explainer and appears coherent with its description. Before installing: ensure you trust the source (it will execute a local Python script), run it in a limited environment if you have concerns, and verify you have python3 available. Note that I observed minor logic/weekday handling quirks in the code (which can affect correctness of some edge cases) but no signs of data exfiltration, network calls, or secret access. If you need absolute correctness for production schedules, consider reviewing or testing the script against known cron examples first.

功能分析

Type: OpenClaw Skill Name: crontab-validator Version: 1.0.0 The crontab-validator skill is a well-implemented utility for parsing, explaining, and linting cron expressions. The core logic in scripts/cron_check.py uses standard Python libraries (re, datetime, argparse) to process inputs and contains no risky execution patterns, network activity, or file system access. The SKILL.md instructions are strictly limited to the tool's stated functionality and do not exhibit any signs of prompt injection or malicious intent.

能力评估

✓ Purpose & Capability

The advertised functionality (validate, explain, lint, and compute next runs for cron expressions) is implemented by scripts/cron_check.py and the SKILL.md usage examples map directly to the script's CLI. No unrelated capabilities (cloud access, system administration, or network calls) are requested or present.

✓ Instruction Scope

SKILL.md instructs the agent to run the included python script with explicit arguments. The instructions do not reference reading unrelated files, environment variables, or external endpoints. The script's imports are limited to standard Python libraries and it performs only local computation. Note: the implementation contains non-security correctness quirks in weekday handling (minor logic inconsistencies), but these are functional bugs rather than scope creep.

✓ Install Mechanism

No install spec is provided; the skill is instruction+script only and expects a python3 runtime to be present. Nothing is downloaded or written during install.

✓ Credentials

The skill requires no environment variables, credentials, or config paths. There are no requests for secrets or unrelated service tokens.

✓ Persistence & Privilege

The skill is not marked always:true and does not request permanent presence or modify other skills or system-wide settings. It runs on demand as a local Python script.

如何使用

确保已安装 OpenClaw（本地或 Docker 部署）
在对话框中输入安装命令：/install crontab-validator
安装完成后，直接呼叫该 Skill 的名称或使用 /crontab-validator 触发
根据 Skill 的参数说明提供必要输入，即可获得结构化输出

版本历史

v1.0.0

Initial release

元数据

Slug crontab-validator

版本 1.0.0

许可证 MIT-0

累计安装 0

当前安装数 0

历史版本数 1

常见问题