{
  "fact": {
    "id": "fact_queue_mailbox",
    "fact_kind": "skill_capability",
    "title": "Queue + mailbox pattern",
    "description": "Reads cowork/data/queues/engineering.jsonl for pending implementation and skill-gate tasks, and cowork/data/mailbox/engineering-coworker.jsonl for peer messages. Claims a task by appending a claim transition, executes, then appends a complete transition - last line per task_id is the current state.",
    "source_doc": "anthropic-skills:engineering-coworker (queue_format, mailbox_format blocks)",
    "created_at": "2026-07-02 04:46:31",
    "cite_as": "https://subagentengineering.com/api/engineering-role-facts/fact_queue_mailbox"
  }
}