Create a thread

Create a thread bound to a Managed Deep Agent. Use the returned thread ID to start runs.

POST /threads

Create a thread

cURL

curl --request POST \
  --url https://api.smith.langchain.com/v1/deepagents/threads \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "agent_id": "11111111-1111-1111-1111-111111111111",
  "options": {
    "test_run": false,
    "skip_memory_write_protection": false
  }
}
'

import requests

url = "https://api.smith.langchain.com/v1/deepagents/threads"

payload = {
    "agent_id": "11111111-1111-1111-1111-111111111111",
    "options": {
        "test_run": False,
        "skip_memory_write_protection": False
    }
}
headers = {
    "X-Api-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-Api-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    agent_id: '11111111-1111-1111-1111-111111111111',
    options: {test_run: false, skip_memory_write_protection: false}
  })
};

fetch('https://api.smith.langchain.com/v1/deepagents/threads', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.smith.langchain.com/v1/deepagents/threads",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'agent_id' => '11111111-1111-1111-1111-111111111111',
    'options' => [
        'test_run' => false,
        'skip_memory_write_protection' => false
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-Api-Key: <api-key>"
  ],
]);

$response = curl_exec($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.smith.langchain.com/v1/deepagents/threads"

	payload := strings.NewReader("{\n  \"agent_id\": \"11111111-1111-1111-1111-111111111111\",\n  \"options\": {\n    \"test_run\": false,\n    \"skip_memory_write_protection\": false\n  }\n}")

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

	req.Header.Add("X-Api-Key", "<api-key>")
	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.post("https://api.smith.langchain.com/v1/deepagents/threads")
  .header("X-Api-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"agent_id\": \"11111111-1111-1111-1111-111111111111\",\n  \"options\": {\n    \"test_run\": false,\n    \"skip_memory_write_protection\": false\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.smith.langchain.com/v1/deepagents/threads")

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

request = Net::HTTP::Post.new(url)
request["X-Api-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"agent_id\": \"11111111-1111-1111-1111-111111111111\",\n  \"options\": {\n    \"test_run\": false,\n    \"skip_memory_write_protection\": false\n  }\n}"

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

201

basic

{ "id": "019e2d67-ff4d-7251-bce5-dfdec8e1991b", "agent_id": "", "status": "idle", "metadata": { "is_test_run": false, "ls_user_id": "33499cf9-4c02-49af-909d-b8f42e051eab", "skip_memory_write_protection": false, "tenant_id": "ebbaf2eb-769b-4505-aca2-d11de10372a4" }, "created_at": "2026-05-15T20:50:50.832351+00:00", "updated_at": "2026-05-15T20:50:50.832351+00:00" }

Authorizations

X-Api-Key · string · header · default: LANGSMITH_API_KEY · required

Body

application/json

agent_id · string<uuid> · required

Managed Deep Agent ID.

options · object

Show child attributes

thread_id · string<uuid>

Optional caller-supplied thread ID.

if_exists · enum<string>

Behavior when thread_id already exists.

Available options: do_nothing, raise

metadata · object

Thread metadata.

Response

201

application/json

Thread created.

id · string<uuid>

agent_id · string<uuid>

status · enum<string>

Available options: idle, busy, interrupted, error

metadata · object

created_at · string<date-time>

updated_at · string<date-time>