Spawn a child Session
curl --request POST \
--url https://api.checkfu.com/v1/sessions/{id}/children \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'checkfu-version: <checkfu-version>' \
--header 'idempotency-key: <idempotency-key>' \
--data '
{
"agent": "<string>",
"environment_id": "<string>",
"content": "<string>",
"title": "<string>"
}
'import requests
url = "https://api.checkfu.com/v1/sessions/{id}/children"
payload = {
"agent": "<string>",
"environment_id": "<string>",
"content": "<string>",
"title": "<string>"
}
headers = {
"checkfu-version": "<checkfu-version>",
"idempotency-key": "<idempotency-key>",
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'checkfu-version': '<checkfu-version>',
'idempotency-key': '<idempotency-key>',
Authorization: 'Bearer <token>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
agent: '<string>',
environment_id: '<string>',
content: '<string>',
title: '<string>'
})
};
fetch('https://api.checkfu.com/v1/sessions/{id}/children', 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.checkfu.com/v1/sessions/{id}/children",
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' => '<string>',
'environment_id' => '<string>',
'content' => '<string>',
'title' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"checkfu-version: <checkfu-version>",
"idempotency-key: <idempotency-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.checkfu.com/v1/sessions/{id}/children"
payload := strings.NewReader("{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("checkfu-version", "<checkfu-version>")
req.Header.Add("idempotency-key", "<idempotency-key>")
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.post("https://api.checkfu.com/v1/sessions/{id}/children")
.header("checkfu-version", "<checkfu-version>")
.header("idempotency-key", "<idempotency-key>")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.checkfu.com/v1/sessions/{id}/children")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["idempotency-key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"child_session_id": "<string>",
"child_thread_id": "<string>"
}{
"error": {
"type": "validation.malformed",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-malformed"
}
}{
"error": {
"type": "auth.invalid_key",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#auth-invalid-key"
}
}{
"error": {
"type": "auth.disabled_tenancy",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#auth-disabled-tenancy"
}
}{
"error": {
"type": "validation.not_found",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-not-found"
}
}{
"error": {
"type": "validation.conflict",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-conflict"
}
}{
"error": {
"type": "budget.exceeded",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#budget-exceeded"
}
}{
"error": {
"type": "runtime.internal",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#runtime-internal"
}
}Spawn a child Session
Creates one child Session with its first thread from the parent Session’s drive plane, selecting the child’s Agent and Environment and seeding its opening content. Returns the child Session and thread identities; the parent keeps running and the child admits under the same live authority as any Session create.
Checkfu support posture: alpha; hosted. Required evidence journey: session-turn. Deployment-specific readiness and the latest proven release are available from GET /v1/support/capabilities.
POST
/
v1
/
sessions
/
{id}
/
children
Spawn a child Session
curl --request POST \
--url https://api.checkfu.com/v1/sessions/{id}/children \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--header 'checkfu-version: <checkfu-version>' \
--header 'idempotency-key: <idempotency-key>' \
--data '
{
"agent": "<string>",
"environment_id": "<string>",
"content": "<string>",
"title": "<string>"
}
'import requests
url = "https://api.checkfu.com/v1/sessions/{id}/children"
payload = {
"agent": "<string>",
"environment_id": "<string>",
"content": "<string>",
"title": "<string>"
}
headers = {
"checkfu-version": "<checkfu-version>",
"idempotency-key": "<idempotency-key>",
"Authorization": "Bearer <token>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'checkfu-version': '<checkfu-version>',
'idempotency-key': '<idempotency-key>',
Authorization: 'Bearer <token>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
agent: '<string>',
environment_id: '<string>',
content: '<string>',
title: '<string>'
})
};
fetch('https://api.checkfu.com/v1/sessions/{id}/children', 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.checkfu.com/v1/sessions/{id}/children",
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' => '<string>',
'environment_id' => '<string>',
'content' => '<string>',
'title' => '<string>'
]),
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"Content-Type: application/json",
"checkfu-version: <checkfu-version>",
"idempotency-key: <idempotency-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.checkfu.com/v1/sessions/{id}/children"
payload := strings.NewReader("{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("checkfu-version", "<checkfu-version>")
req.Header.Add("idempotency-key", "<idempotency-key>")
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.post("https://api.checkfu.com/v1/sessions/{id}/children")
.header("checkfu-version", "<checkfu-version>")
.header("idempotency-key", "<idempotency-key>")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.checkfu.com/v1/sessions/{id}/children")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["idempotency-key"] = '<idempotency-key>'
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"agent\": \"<string>\",\n \"environment_id\": \"<string>\",\n \"content\": \"<string>\",\n \"title\": \"<string>\"\n}"
response = http.request(request)
puts response.read_body{
"child_session_id": "<string>",
"child_thread_id": "<string>"
}{
"error": {
"type": "validation.malformed",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-malformed"
}
}{
"error": {
"type": "auth.invalid_key",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#auth-invalid-key"
}
}{
"error": {
"type": "auth.disabled_tenancy",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#auth-disabled-tenancy"
}
}{
"error": {
"type": "validation.not_found",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-not-found"
}
}{
"error": {
"type": "validation.conflict",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#validation-conflict"
}
}{
"error": {
"type": "budget.exceeded",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#budget-exceeded"
}
}{
"error": {
"type": "runtime.internal",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#runtime-internal"
}
}Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Headers
Available options:
2026-08-31 Required string length:
1 - 255Path Parameters
Pattern:
^sess_[0-9a-f]{32}$Body
application/json