curl --request POST \
  --url https://api.runtools.ai/v1/agent-attachments \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "threadId": "<string>",
  "filename": "<string>",
  "contentType": "<string>",
  "agentSlug": "<string>",
  "sizeBytes": 123
}
'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "uploadUrl": "<string>",
    "method": "<string>",
    "headers": {},
    "expiresAt": "2023-11-07T05:31:56Z"
  }
}