A Task is persistent work owned by one Agent. You can create one from Tasks, or from a chat message with Create task. A new Task has a title (1 to 200 characters) and an optional description (up to 20,000). It starts queued, gets its own work conversation and wakes the Agent.
While it runs you can comment on it, see its activity and files, stop it, and resume it. When the Agent finishes, fails, or needs you, it reports back, in the chat it started from when there is one. You review a finished Task from the Tasks list.
A Task has an id and a visible number (#42). Both open the same Task.