Agent Skills: running-resumable-sync-jobs

Design and review long-running batch or sync jobs that process many items against a remote API and persist checkpoint state — exit codes that report partial failure, checkpoints that are safe to resume and written atomically, per-item tolerance vs. fatal abort, telling "zero" apart from "couldn't fetch", bounded retries, honest dry-runs, timezone-safe incremental cursors, and compensating reserved resources. Use when writing or reviewing a mirror/sync command, a nightly cron job, an importer, a paginated fetcher, or a background worker that consumes quota.