cron

cron is a skill for Claude Code from vmkteam/claude-plugins. It costs 71 tokens per session (1,062 once invoked), scanned A, original, MIT.

A Go library and manager for scheduled jobs, meaning tasks that run at set times or intervals. It wraps robfig/cron and supports context-aware tasks, a web interface, manual starts, middleware, and Prometheus monitoring metrics.

In plain words
What is it for?
Use it to schedule tasks such as user synchronisation, database cleanup, or manually triggered imports, and to expose a debugging page and Prometheus metrics.
Why use it?
It gives an application one place to define, run, inspect, and monitor recurring jobs. It can also handle long-running jobs, errors, panics, and exclusive maintenance tasks.

Skill for Claude Code

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

Part of the vmkteam-developer plugin — 35 skills shipped together

Good fit Use it to schedule tasks such as user synchronisation, database cleanup, or manually triggered imports, and to expose a debugging page and Prometheus metrics.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/vmkteam/claude-plugins/cron
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.

Any agent
npx skills add vmkteam/claude-plugins --skill cron
Clone the repo
git clone --depth 1 https://github.com/vmkteam/claude-plugins

Made for: Claude Code.

Or install vmkteam-developer, the plugin that ships this one along with the rest of its 35 skills.

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 cron

README.md
[![agentmods](https://agentmods.dev/badge/skills/vmkteam/claude-plugins/cron/github.svg)](https://agentmods.dev/skills/vmkteam/claude-plugins/cron)
Your own site
<a href="https://agentmods.dev/skills/vmkteam/claude-plugins/cron"><img src="https://agentmods.dev/badge/skills/vmkteam/claude-plugins/cron/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 cron

Your own site · 80×15
<a href="https://agentmods.dev/skills/vmkteam/claude-plugins/cron"><img src="https://agentmods.dev/badge/skills/vmkteam/claude-plugins/cron.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,062 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 $0.00071 $0.01062
Opus 5.5 $0.00028 $0.00425
Sonnet 5.5 $0.00014 $0.00212
Haiku 4.5 $0.00007 $0.00106

Measured 6d ago against content hash 1de16407ea55, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

cron 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 6d 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/developer/skills/cron/SKILL.md · 109 lines

How it starts

The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cron

  • Upstream: https://github.com/vmkteam/cron
  • Обёртка над robfig/cron: context-aware jobs, web UI, ручной запуск, middleware, метрики
  • Сигнатура задачи: func(ctx context.Context) error

Воркеры не живут в пакете домена. Расписание — pkg/app/cron.go (newCron(), CronConfig), задача — метод менеджера домена func(ctx) error. Пакет <domain>/cron и свой генерик Job поверх vmkteam/cron не нужны: менеджер уже даёт DI, middleware — метрики, логи и Sentry.

Базовый шаблон

m := cron.NewManager()
m.Use(
    cron.WithMetrics("mysrv"),
    cron.WithDevel(cfg.IsDevel),
    cron.WithSLog(logger),
    cron.WithMaintenance(log.Printf),
    cron.WithSkipActive(),
    cron.WithRecover(),
    cron.WithSentry(),
)

m.AddFunc("sync-users", "*/5 * * * *", func(ctx context.Context) error { ... })
m.AddMaintenanceFunc("db-vacuum", "0 4 * * 0", ...)   // эксклюзивный, блокирует остальные
m.AddFunc("manual-import", "", ...)                    // "" = только ручной запуск

go m.Run(ctx)
http.HandleFunc("/debug/cron", m.Handler)

Middleware

MW Назначение
WithMetrics(serverName) Prometheus (count/duration/active)
WithSLog(logger) structured logging
WithLogger(printf, serverName) legacy Printf
WithSentry() ошибки + panic recovery → Sentry
WithRecover() panic recovery (альтернатива WithSentry)
WithDevel(isDevel) dev-флаг в ctx
WithSkipActive() обязателен для длинных задач — пропуск если предыдущий запуск ещё идёт
WithMaintenance(printf) эксклюзивное выполнение maintenance-задач

Метрики

  • app_cron_evaluated_total — counter выполнений по состояниям
  • app_cron_active — gauge активных задач
  • app_cron_evaluated_duration_seconds — summary длительности

UI / API

  • GET /debug/cron — HTML расписание (имя, паттерн, next, state, duration)
  • GET /debug/cron с Accept: application/json — JSON
  • GET /debug/cron?start=<name> — ручной запуск (follow redirect)

Read the full file on GitHub · 109 lines

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. 6d ago Changed · +2 lines · +21 tokens per session 1de16407ea55
  2. 1mo ago First seen · 107 lines · 50 tokens per session scan A f75728b422cb

Subscribe to this mod's changes

cron is a skill published in the GitHub repository vmkteam/claude-plugins (7 stars, last pushed 6d ago), licensed MIT. It adds 71 tokens to every session and 1,062 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-31.

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