add-cron

add-cron is a skill for Claude Code from flavien-ia/hypervibe-harness. It costs 58 tokens per session (5,680 once invoked), scanned A, original, Apache-2.0.

A tool for adding scheduled work to a project, such as a protected web endpoint, a Cloudflare Worker, or a GitHub Action that runs on a timetable.

In plain words
What is it for?
Use it for scheduled jobs such as periodic data processing, maintenance, or other project tasks that must run at set times.
Why use it?
It removes the need to run recurring maintenance or processing tasks by hand.

Skill for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions Codex.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is cd ../...

Part of the hypervibe plugin — 87 skills, 1 hook, 1 MCP server shipped together

Good fit Use it for scheduled jobs such as periodic data processing, maintenance, or other project tasks that must run at set times.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/flavien-ia/hypervibe-harness
agentmods
npx agentmods add skills/flavien-ia/hypervibe-harness/add-cron

Made for: Claude Code.

Or install hypervibe, the plugin that ships this one along with the rest of its 87 skills, 1 hook, 1 MCP server.

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 add-cron

README.md
[![agentmods](https://agentmods.dev/badge/skills/flavien-ia/hypervibe-harness/add-cron/github.svg)](https://agentmods.dev/skills/flavien-ia/hypervibe-harness/add-cron)
Your own site
<a href="https://agentmods.dev/skills/flavien-ia/hypervibe-harness/add-cron"><img src="https://agentmods.dev/badge/skills/flavien-ia/hypervibe-harness/add-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 add-cron

Your own site · 80×15
<a href="https://agentmods.dev/skills/flavien-ia/hypervibe-harness/add-cron"><img src="https://agentmods.dev/badge/skills/flavien-ia/hypervibe-harness/add-cron.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,680 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 2 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high Privilege Escalation · line 176
    Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
    Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
  • medium Rogue Agent · line 23
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
How audits are shown
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 $0.00058 $0.05680
Opus 5 $0.00029 $0.02840
Sonnet 5 $0.00012 $0.01136
Haiku 4.5 $0.00006 $0.00568

Measured 10d ago against content hash f80880af7b11, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

add-cron scanned grade A with 1 finding 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 10d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -fsSL -X POST \
skills/add-cron/SKILL.md · 438 lines

How it starts

The opening of the file, as written. The whole thing — 438 lines — stays where its author put it; the contents beside it link to each section on GitHub.

⚠️ Before any call to wrangler (do this BEFORE any other wrangler command in this skill)

eval "$(node "${CLAUDE_SKILL_DIR}/../../scripts/wrangler-env-init.mjs")"

This line loads CLOUDFLARE_API_TOKEN from User scope (Windows registry / shell rc on Mac/Linux) if it is not already in process.env, and adds the pnpm bin to PATH (for bash sessions where pnpm setup has not yet propagated). Without it, wrangler fails with "command not found" on Mac (Spotlight), or may use a different Cloudflare account than the one the user expects.

Add Cron - Scheduled tasks (auto-routing between 3 clocks)

Communication

  • Detect the user's language from the conversation (the user's own messages, anywhere in the session - not just this invocation: a bare slash command like /bootstrap carries no language signal by itself). If nothing in the conversation gives a signal, fall back to the OS locale (node -e "console.log(Intl.DateTimeFormat().resolvedOptions().locale)") before defaulting to English. ALWAYS reply in that language for every user-facing message: questions, progress, confirmations, summaries, errors - including any example text quoted in this skill, which is illustrative and must be translated, never sent verbatim.
  • Use plain, non-technical business language. Never expose internal script names (*.mjs) or jargon; describe actions in human terms.
  • When generating user-facing content for the scaffolded project (UI labels, emails, copy), write it in the user's language too.
  • Show progress as a short natural-language checklist (in-progress and done states).

You add a scheduled task to the current Next.js project. You decide yourself which clock is best, based on the nature of the task. You ask the user NOTHING about this choice - you act, then you explain in 1 sentence what you did in the final summary.

Non-tech audience: language rules

The users of this plugin may be non-technical. In EVERYTHING you show to the user:

  • Zero gratuitous jargon. No "Worker", "Action", "workflow", "endpoint", "slot", "trigger", "cron expression", "bearer token", "repo", "yaml" without explanation. When a technical term is unavoidable, put it in parentheses or explain it in a short clause.
  • Speak in business terms, not infrastructure. Say "a scheduled task" rather than "a cron", "your shared clock" / "a dedicated clock" / "the GitHub clock" rather than "the hypervibe-jobs worker" / "CF Worker" / "GitHub Action", "your site" rather than "your Next.js endpoint", "your keys" rather than "your env vars".
  • NEVER suggest commands to type. The user does not open a terminal. When an action is possible (delete, test, view the logs, change the schedule), offer it in natural language - "tell me 'delete task X' and I'll take care of it", "do you want me to run it right now to test it?". Claude executes, the user does not type.
  • Avoid tech anglicisms ("skipped", "overkill", "fallback", "deploy") in user-facing blocks. Internal use only.

Read the full file on GitHub · 438 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 10d ago First seen · 438 lines · 58 tokens per session scan A f80880af7b11

Subscribe to this mod's changes

add-cron is a skill published in the GitHub repository flavien-ia/hypervibe-harness (37 stars, last pushed today), licensed Apache-2.0. It adds 58 tokens to every session and 5,680 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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