Agent skill

cronlytic

Cronlytic API for cron job monitoring. Use when user mentions "cron job", "scheduled task monitoring", or "Cronlytic".

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Install this agent skill to your Project

npx add-skill https://github.com/vm0-ai/vm0-skills/tree/main/cronlytic

SKILL.md

Cronlytic

Use Cronlytic via direct curl calls to schedule and manage cron jobs that trigger HTTP requests/webhooks.

Official docs: https://www.cronlytic.com/api-documentation

When to Use

Use this skill when you need to:

  • Schedule recurring HTTP requests (webhooks, API calls)
  • Automate background tasks without managing servers
  • Create cron jobs with standard 5-field expressions
  • Pause/resume jobs dynamically
  • Monitor job execution via logs

Prerequisites

  1. Sign up at Cronlytic
  2. Go to Dashboard → API Keys → Generate New API Key
  3. Copy your API Key and User ID
bash
export CRONLYTIC_API_KEY="your-api-key"
export CRONLYTIC_USER_ID="your-user-id"

Base URL

https://api.cronlytic.com/prog/

How to Use

1. Health Check (Ping)

Check if API is available (no auth required):

bash
curl -s -X GET "https://api.cronlytic.com/prog/ping"

Response: {"message": "pong"}

2. Create a Cron Job

Create a scheduled job to call a webhook.

Write to /tmp/cronlytic_request.json:

json
{
  "name": "daily-backup",
  "url": "https://api.example.com/backup",
  "method": "POST",
  "headers": {"Authorization": "Bearer token123"},
  "body": "{\"type\": \"full\"}",
  "cron_expression": "0 2 * * *"
}

Then run:

bash
curl -s -X POST "https://api.cronlytic.com/prog/jobs" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)" -H "Content-Type: application/json" -d @/tmp/cronlytic_request.json | jq '{job_id, name, status, next_run_at}'

3. Create GET Request Job

Simple health check every 5 minutes.

Write to /tmp/cronlytic_request.json:

json
{
  "name": "health-check",
  "url": "https://api.example.com/health",
  "method": "GET",
  "headers": {},
  "body": "",
  "cron_expression": "*/5 * * * *"
}

Then run:

bash
curl -s -X POST "https://api.cronlytic.com/prog/jobs" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)" -H "Content-Type: application/json" -d @/tmp/cronlytic_request.json | jq '{name, status}'

4. List All Jobs

Get all your scheduled jobs:

bash
curl -s -X GET "https://api.cronlytic.com/prog/jobs" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)" | jq '.[] | {job_id, name, status, cron_expression, next_run_at}'

5. Update a Job

Update an existing job (all fields required). Replace <your-job-id> with the actual job ID:

Write to /tmp/cronlytic_request.json:

json
{
  "name": "daily-backup-v2",
  "url": "https://api.example.com/backup/v2",
  "method": "POST",
  "headers": {"Authorization": "Bearer newtoken"},
  "body": "{\"type\": \"incremental\"}",
  "cron_expression": "0 3 * * *"
}

Then run:

bash
curl -s -X PUT "https://api.cronlytic.com/prog/jobs/<your-job-id>" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)" -H "Content-Type: application/json" -d @/tmp/cronlytic_request.json | jq '{job_id, name, status, next_run_at}'

6. Pause a Job

Stop a job from executing. Replace <your-job-id> with the actual job ID:

bash
curl -s -X POST "https://api.cronlytic.com/prog/jobs/<your-job-id>/pause" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)"

7. Resume a Job

Resume a paused job. Replace <your-job-id> with the actual job ID:

bash
curl -s -X POST "https://api.cronlytic.com/prog/jobs/<your-job-id>/resume" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)"

8. Get Job Logs

View execution history (last 50 entries). Replace <your-job-id> with the actual job ID:

bash
curl -s -X GET "https://api.cronlytic.com/prog/jobs/<your-job-id>/logs" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)" | jq '.logs[] | {timestamp, status, response_code, response_time}'

9. Delete a Job

Permanently delete a job and its logs. Replace <your-job-id> with the actual job ID:

bash
curl -s -X DELETE "https://api.cronlytic.com/prog/jobs/<your-job-id>" -H "X-API-Key: $(printenv CRONLYTIC_API_KEY)" -H "X-User-ID: $(printenv CRONLYTIC_USER_ID)"

Cron Expression Format

Standard 5-field cron: minute hour day month day-of-week

┌───────────── minute (0-59)
│ ┌───────────── hour (0-23)
│ │ ┌───────────── day of month (1-31)
│ │ │ ┌───────────── month (1-12)
│ │ │ │ ┌───────────── day of week (0-6, Sun=0)
│ │ │ │ │
* * * * *

Common Examples

Expression Description
*/5 * * * * Every 5 minutes
0 * * * * Every hour at minute 0
0 9 * * * Daily at 9:00 AM
0 9 * * 1-5 Weekdays at 9:00 AM
0 0 1 * * First day of month at midnight
30 14 * * 0 Sunday at 2:30 PM
0 */6 * * * Every 6 hours

Job Status Values

Status Description
pending Scheduled, waiting for next_run_at
paused Paused, won't execute
success Last execution succeeded
failed Last execution failed
quota_reached Skipped due to plan quota

Create Job Parameters

Field Type Required Description
name string Yes Job name (1-50 chars, alphanumeric/-/_)
url string Yes Target URL (HTTP/HTTPS)
method string Yes HTTP method (GET, POST, PUT, DELETE)
headers object Yes Request headers (can be {})
body string Yes Request body (can be "")
cron_expression string Yes 5-field cron expression

Job Name Rules

  • Only letters, numbers, hyphens (-), underscores (_)
  • Length: 1-50 characters
  • Regex: ^[a-zA-Z0-9_-]+$

Valid: my-job, test_job_1, API-Health-Check Invalid: my job (space), test@job (@), api.health (.)

Response Fields

Field Description
job_id Unique job identifier
name Job name
url Target URL
method HTTP method
status Current job status
cron_expression Schedule expression
next_run_at Next scheduled execution (ISO timestamp)
created_at Creation timestamp

Guidelines

  1. Ping first: Call /ping to warm up the API (Lambda cold start)
  2. All fields required: When creating/updating, provide all fields
  3. Valid cron only: Use standard 5-field cron format
  4. Job names: Use alphanumeric with hyphens/underscores only
  5. Check logs: Use the logs endpoint to debug failed jobs
  6. Dashboard: Use https://www.cronlytic.com/dashboard for visual management
  7. Plan limits: Free tier has job limits - upgrade if needed

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