> ## Documentation Index > Fetch the complete documentation index at: https://usefused.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Tasks > Create retryable application work, defer it from tools, and run it on a schedule. Harnest Tasks run application-owned work outside the model tool call that requested it. Put each public `@task` callable under root `tasks/`; Harnest discovers it by filename and adds the queue runtime only when a task exists. | Need | Use | | -------------------------------------------------------------- | ---------------------------------------------------------------------- | | Retryable work that a tool or trusted service starts | `await task.defer(...)` | | Wait for queued work from an agent invocation | Async `@tool(durable=True)` | | Start work at a fixed UTC schedule | A matching declaration under [`cron/`](/docs/harnest/build/scheduled-tasks) | | Let managed code create or control a user's recurring schedule | [Dynamic schedules](/docs/harnest/build/dynamic-schedules) | | Ordinary in-process reuse | Call the decorated task directly | Define, defer, inspect, cancel, and await a folder-discovered Task. Declare fixed UTC schedules in `cron/`. Create and control user-owned schedules from managed code. Understand suspension, replica recovery, and the boundary between a Task and the framework run waiting for it.