/api/v2/task_dependencies

Creates a directional dependency between two tasks. Requires task_id, dependent_task_id, and type_id (1 = Blocking, 2 = Waiting on, 3 = Linked).

A paired reverse record is created automatically (Blocking ↔ Waiting on; Linked is symmetric) — both share lifecycle, so type updates and deletes apply to both.

{
  "data": {
    "type": "task_dependencies",
    "attributes": {
      "task_id": 4421188,
      "dependent_task_id": 4421199,
      "type_id": 1
    }
  }
}