Concurrency, Retry, And Timeout Under One Owner

AI agents do not fail in one place. They fail across retries, timeouts, tools, and provider calls. Last time we showed work(items).inParallel(8).withRetry(3).withTimeout("5s").do(fn) — the one-line fluent surface for processing a list. That handles the 80% case. Check Owned Async Work in TypeScript — Promise.race does not cancel your work and Your AI Is Still Billing After the User Closed the Tab in case you missed them. This article is about the other 20%: orchestrating heterogeneous tasks that