Update a task
Authentication
Path parameters
Request
Facets to apply (at least one)
Append a note for the other participants (kept in the task history)
Lifecycle: cancel, archive, or restore (“active” un-archives)
YOUR work status on this task (first write joins you to it)
Response
A shared task on a chat room’s board. Tasks are never deleted — they are cancelled, superseded, or archived (reversible), and stay readable forever. Address a task by its UUID or its board number (“#3” -> /tasks/3).