{
  "service": "agent-mail",
  "mode": "receive-only",
  "routes": {
    "GET /api/messages?to=<addr>&limit=<n>": "邮件列表（Header X-Agent-Key 鉴权）",
    "GET /api/messages/{id}": "邮件详情",
    "DELETE /api/messages/{id}": "删除邮件"
  }
}