Cron Scheduler

Cron Scheduler helps your AI agent build reliable scheduled job systems that don't silently fail, run twice at scale, or produce incorrect results when retried.

Cron Expression Generation

Generates and validates cron expressions for common patterns: hourly with offset, business-hours-only, first weekday of month, quarterly, and timezone-specific. Explains each field in plain English and flags expressions that behave unexpectedly across DST transitions.

Idempotency Design

Jobs must be safe to run more than once. The skill designs jobs with idempotency keys, state checkpointing for resumable long-running jobs, and at-least-once delivery handling using database-level deduplication.

Distributed Locking

For jobs running across multiple instances, implements distributed mutual exclusion using Redis SET NX EX or PostgreSQL advisory locks. Includes lock heartbeat renewal and automatic release on crash.

Observability

Adds structured logging with job ID, run timestamp, duration, and outcome. Instruments jobs with Prometheus metrics for last_successful_run, job_duration_seconds, and job_failures_total. Includes alerting on missed scheduled runs.