import Retell from 'retell-sdk';

const client = new Retell({
  apiKey: process.env['RETELL_API_KEY'], // This is the default and can be omitted
});

const llmResponse = await client.llm.update('16b980523634a6dc504898cda492e939', {
  begin_message: 'Hey I am a virtual assistant calling from Retell Hospital.',
});

console.log(llmResponse.llm_id);

import os
from retell import Retell

client = Retell(
    api_key=os.environ.get("RETELL_API_KEY"),  # This is the default and can be omitted
)
llm_response = client.llm.update(
    llm_id="16b980523634a6dc504898cda492e939",
    begin_message="Hey I am a virtual assistant calling from Retell Hospital.",
)
print(llm_response.llm_id)

curl --request PATCH \
  --url https://api.retellai.com/update-retell-llm/{llm_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "begin_message": "Hey I am a virtual assistant calling from Retell Hospital."
}
'

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.retellai.com/update-retell-llm/{llm_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'begin_message' => 'Hey I am a virtual assistant calling from Retell Hospital.'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.retellai.com/update-retell-llm/{llm_id}"

	payload := strings.NewReader("{\n  \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.retellai.com/update-retell-llm/{llm_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.retellai.com/update-retell-llm/{llm_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"begin_message\": \"Hey I am a virtual assistant calling from Retell Hospital.\"\n}"

response = http.request(request)
puts response.read_body

{
  "llm_id": "oBeDLoLOeuAbiuaMFXRtDOLriTJ5tSxD",
  "last_modification_timestamp": 1703413636133,
  "version": 0,
  "is_published": false,
  "model_config": {
    "type": "cascading",
    "primary": {
      "model": "gpt-4.1",
      "tier": "standard"
    },
    "backup": {
      "model": "gpt-4.1",
      "tier": "standard",
      "kick_in_timeout_ms": 30150
    },
    "temperature": 0
  },
  "model": "gpt-5.6-terra",
  "s2s_model": "gpt-realtime-1.5",
  "model_temperature": 0,
  "model_high_priority": true,
  "model_ultrafast": true,
  "tool_call_strict_mode": true,
  "knowledge_base_ids": [
    "<string>"
  ],
  "kb_config": {
    "top_k": 3,
    "filter_score": 0.6
  },
  "start_speaker": "user",
  "begin_after_user_silence_ms": 2000,
  "begin_message": "Hey I am a virtual assistant calling from Retell Hospital.",
  "general_prompt": "You are ...",
  "general_tools": [
    {
      "type": "end_call",
      "name": "end_call",
      "description": "End the call with user."
    }
  ],
  "states": [
    {
      "name": "information_collection",
      "state_prompt": "You will follow the steps below to collect information...",
      "edges": [
        {
          "destination_state_name": "appointment_booking",
          "description": "Transition to book an appointment."
        }
      ],
      "tools": [
        {
          "type": "transfer_call",
          "name": "transfer_to_support",
          "description": "Transfer to the support team.",
          "transfer_destination": {
            "type": "predefined",
            "number": "16175551212",
            "ignore_e164_validation": false
          },
          "transfer_option": {
            "type": "cold_transfer",
            "show_transferee_as_caller": false
          }
        }
      ]
    },
    {
      "name": "appointment_booking",
      "state_prompt": "You will follow the steps below to book an appointment...",
      "tools": [
        {
          "type": "custom",
          "name": "book_appointment",
          "description": "Book an annual check up.",
          "url": "https://api.example.com/book-appointment",
          "method": "POST"
        }
      ]
    }
  ],
  "starting_state": "information_collection",
  "default_dynamic_variables": {
    "customer_name": "John Doe"
  },
  "mcps": [
    {
      "name": "<string>",
      "url": "<string>",
      "headers": {
        "Authorization": "Bearer 1234567890"
      },
      "query_params": {
        "index": "1",
        "key": "value"
      },
      "timeout_ms": 123
    }
  ],
  "is_transfer_llm": false
}

{
  "status": "error",
  "message": "Invalid request format, please check API reference."
}

{
  "status": "error",
  "message": "API key is missing or invalid."
}

{
  "status": "error",
  "message": "Precondition failed for conditional update."
}

{
  "status": "error",
  "message": "Cannot find requested asset under given api key."
}

{
  "status": "error",
  "message": "An unexpected server error occurred."
}