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.
npx agentmods add skills/bug-ops/zeph/cronnpx skills add bug-ops/zeph --skill crongit clone --depth 1 https://github.com/bug-ops/zephWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00079 | $0.03806 |
| Opus 5 | $0.00039 | $0.01903 |
| Sonnet 5 | $0.00016 | $0.00761 |
| Haiku 4.5 | $0.00008 | $0.00381 |
Grade B, and why
cron scanned grade B 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 2d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
sudo crontab -u username -e How it starts
The opening of the file, as written. The whole thing — 472 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Task Scheduling with Cron, At, and Launchd
Cron Expression Format
┌─────────── minute (0-59)
│ ┌───────── hour (0-23)
│ │ ┌─────── day of month (1-31)
│ │ │ ┌───── month (1-12 or JAN-DEC)
│ │ │ │ ┌─── day of week (0-6, SUN-SAT; 7 = SUN on some systems)
│ │ │ │ │
* * * * * command
Special Characters
| Character | Meaning | Example |
|---|---|---|
* |
Any value | * * * * * (every minute) |
, |
List | 1,15,30 (at 1, 15, 30) |
- |
Range | 1-5 (1 through 5) |
/ |
Step | */5 (every 5 units) |
Common Expressions
| Expression | Schedule |
|---|---|
* * * * * |
Every minute |
*/5 * * * * |
Every 5 minutes |
*/15 * * * * |
Every 15 minutes |
0 * * * * |
Every hour (at :00) |
0 */2 * * * |
Every 2 hours |
30 * * * * |
Every hour at :30 |
0 0 * * * |
Daily at midnight |
0 6 * * * |
Daily at 6:00 AM |
0 8,12,18 * * * |
At 8 AM, noon, 6 PM |
0 9-17 * * * |
Every hour from 9 AM to 5 PM |
0 0 * * 0 |
Weekly on Sunday at midnight |
0 0 * * 1-5 |
Weekdays at midnight |
0 0 * * 6,0 |
Weekends at midnight |
0 0 1 * * |
First day of every month |
0 0 1 1 * |
Yearly on January 1 |
0 0 1 */3 * |
Every 3 months (quarterly) |
0 0 15 * * |
15th of every month |
5 4 * * 0 |
Sunday at 4:05 AM |
0 22 * * 1-5 |
Weekdays at 10 PM |
Predefined Shortcuts
| Shortcut | Equivalent | Description |
|---|---|---|
@reboot |
— | Run once at startup |
@yearly / @annually |
0 0 1 1 * |
Once a year (Jan 1) |
@monthly |
0 0 1 * * |
Once a month (1st) |
@weekly |
0 0 * * 0 |
Once a week (Sunday) |
@daily / @midnight |
0 0 * * * |
Once a day |
@hourly |
0 * * * * |
Once an hour |
Crontab Management
# Edit current user's crontab
crontab -e
# List current user's crontab
crontab -l
# Remove current user's crontab (careful!)
crontab -r
# Edit crontab for another user (requires root)
sudo crontab -u username -e
# List another user's crontab
sudo crontab -u username -l
# Create crontab from file
crontab mycrontab.txt
# Backup crontab
crontab -l > crontab-backup.txt
# Restore crontab from backup
crontab crontab-backup.txt
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.
- 2d ago First seen · 472 lines · 79 tokens per session scan B 7be9f425ca0c
cron is a skill published in the GitHub repository bug-ops/zeph (57 stars, last pushed 8d ago), licensed MIT. It adds 79 tokens to every session and 3,806 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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