writing-tasks-introduction.mdx

title	Writing tasks: Overview
sidebarTitle	Overview
description	Tasks are the core of Trigger.dev. They are long-running processes that are triggered by events.

import ExamplesCards from "/snippets/examples-cards.mdx";

Before digging deeper into the details of writing tasks, you should read the fundamentals of tasks to understand what tasks are and how they work.

Writing tasks

Topic	Description
Logging	View and send logs and traces from your tasks.
Errors & retrying	How to deal with errors and write reliable tasks.
Wait	Wait for periods of time or for external events to occur before continuing.
Concurrency & Queues	Configure what you want to happen when there is more than one run at a time.
Realtime notifications	Send realtime notifications from your task that you can subscribe to from your backend or frontend.
Versioning	How versioning works.
Machines	Configure the CPU and RAM of the machine your task runs on
Idempotency	Protect against mutations happening twice.
Replaying	You can replay a single task or many at once with a new version of your code.
Max duration	Set a maximum duration for your task to run.
Tags	Tags allow you to easily filter runs in the dashboard and when using the SDK.
Metadata	Attach a small amount of data to a run and update it as the run progresses.
Usage	Get compute duration and cost from inside a run, or for a specific block of code.
Context	Access the context of the task run.
Bulk actions	Run actions on many task runs at once.
Priority	Specify a priority when triggering a task.
Hidden tasks	Create tasks that are not exported from your trigger files but can still be executed.