curl --request POST \
  --url https://api.agentixx.io/api/agents/{id}/improve-instructions \
  --header 'Content-Type: application/json' \
  --header 'x-tenant-id: <api-key>' \
  --cookie better-auth.session_token= \
  --data '
{
  "currentInstructions": "Answer customer questions.",
  "tone": "professional"
}
'

{
  "instructions": "<string>"
}