curl -X POST "https://api.magpipe.ai/functions/v1/manage-dynamic-variables" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "agent_id": "123e4567-e89b-12d3-a456-426614174000",
    "name": "caller_name",
    "description": "The full name of the caller",
    "var_type": "text"
  }'

{
  "id": "789e0123-e89b-12d3-a456-426614174000",
  "agent_id": "123e4567-e89b-12d3-a456-426614174000",
  "user_id": "456e7890-e89b-12d3-a456-426614174000",
  "name": "caller_name",
  "description": "The full name of the caller",
  "var_type": "text",
  "enum_options": null,
  "created_at": "2024-01-15T10:30:00Z",
  "updated_at": "2024-01-15T10:30:00Z"
}

{
  "error": "enum_options must be a non-empty array when var_type is enum"
}

{
  "error": "A variable with this name already exists for this agent"
}