Posts a comment on one task, attributed to whoever the token belongs to. body is the only field, and unsafe HTML is stripped before it is stored. A task you cannot see returns 404.

Posting a comment notifies the people already following that task — its assignee and anyone subscribed to it. Who gets notified is decided entirely by the task, never by what the comment says.

@-mentions do not work here. Writing @Alex in body stores those characters and nothing more: it does not link to Alex, does not notify Alex, and there is no parameter that would. If you need to reach a specific person, this is not the endpoint for it.

Attachments are not supported either.

{
  "comment": {
    "body": "Looks good to me!"
  }
}

{
  "data": {
    "id": 5821,
    "kind": "user_created",
    "commentable_type": "Task",
    "created_at": "2026-04-14T09:12:04.000Z",
    "body_plain_text": "Looks good to me!",
    "commentable_id": "ad3fdad8-5072-46df-8800-bb57299179df",
    "author_member_id": 314
  },
  "meta": {
    "request_id": "b1f0d2c4-7a9e-4c3b-8d5f-1e2a3b4c5d6e"
  }
}