Persists which numeroProceso ids this actor has already returned - and their last-known estado + content fingerprint - in its own private key-value store that survives between scheduled runs, and keeps only the ones that are new, status-changed or amended. IMPORTANT for this source: comprar.mendoza.gov.ar's process listing is sorted by numero de proceso ascending (each organism's own sequential counter, cycling through years) - NOT by date and NOT newest-first. Verified live: a blank-form search's first page mixes processes from 2019 through 2026 rather than showing only the most recent ones. Because of this, onlyNew is a safe POST-FILTER (fetch up to maxItems raw processes exactly as a normal run does, then drop the ones already seen and unchanged) rather than an early-stop optimization - it does NOT make pagination stop sooner, and it does NOT guarantee a newly created process will appear within a small maxItems window, since its position in the list depends on its own organism's counter, not on when it was published. Raise maxItems to cover more of the backlog if a delta run keeps returning fewer new records than expected. See AGENTS.md for the full live evidence.