curl --request POST \
  --url https://api.voice.ai/agent/v1/agent/{agent_id}/assign-knowledge-base \
  --header 'Content-Type: application/json' \
  --data '{
  "kb_id": 123
}'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}