Archive an idle Session thread
curl --request POST \
--url https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive \
--header 'Authorization: Bearer <token>' \
--header 'checkfu-version: <checkfu-version>'import requests
url = "https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive"
headers = {
"checkfu-version": "<checkfu-version>",
"Authorization": "Bearer <token>"
}
response = requests.post(url, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'checkfu-version': '<checkfu-version>', Authorization: 'Bearer <token>'}
};
fetch('https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive', 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/{session_id}/threads/{thread_id}/archive",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"checkfu-version: <checkfu-version>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive"
req, _ := http.NewRequest("POST", url, nil)
req.Header.Add("checkfu-version", "<checkfu-version>")
req.Header.Add("Authorization", "Bearer <token>")
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/{session_id}/threads/{thread_id}/archive")
.header("checkfu-version", "<checkfu-version>")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"id": "<string>",
"type": "session_thread",
"agent": {
"id": "<string>",
"description": "<string>",
"mcp_servers": [
{
"type": "url",
"name": "<string>",
"url": "<string>"
}
],
"model": {
"id": "<string>",
"effort": {
"type": "low"
},
"inference_geo": "global",
"speed": "standard"
},
"name": "<string>",
"skills": [
{
"type": "anthropic",
"skill_id": "<string>",
"version": "<string>"
}
],
"system": "<string>",
"tools": [
{
"type": "agent_toolset_20260401",
"configs": [
{
"name": "bash",
"type": "bash",
"enabled": true,
"permission_policy": {
"type": "always_allow"
}
}
],
"default_config": {
"enabled": true,
"permission_policy": {
"type": "always_allow"
}
}
}
],
"type": "agent",
"version": 1
},
"archived_at": "<string>",
"created_at": "<string>",
"parent_thread_id": "<string>",
"session_id": "<string>",
"stats": {
"active_seconds": 1,
"duration_seconds": 1,
"startup_seconds": 1
},
"status": "running",
"updated_at": "<string>",
"usage": {
"input_tokens": 1,
"output_tokens": 1,
"cache_read_input_tokens": 1,
"cache_creation": {
"ephemeral_1h_input_tokens": 1,
"ephemeral_5m_input_tokens": 1
}
}
}{
"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": "runtime.invalid_transition",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#runtime-invalid-transition"
}
}{
"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"
}
}Archive an idle Session thread
Permanently terminates one idle child thread and releases its slot under the Session’s 25-thread ceiling. Exact retries are idempotent. Running, rescheduling, and terminal-but-unarchived children are refused with runtime.invalid_transition; the primary is refused with runtime.primary_thread.
Checkfu support posture: alpha; hosted. Required evidence journey: session-threads. Deployment-specific readiness and the latest proven release are available from GET /v1/support/capabilities.
POST
/
v1
/
sessions
/
{session_id}
/
threads
/
{thread_id}
/
archive
Archive an idle Session thread
curl --request POST \
--url https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive \
--header 'Authorization: Bearer <token>' \
--header 'checkfu-version: <checkfu-version>'import requests
url = "https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive"
headers = {
"checkfu-version": "<checkfu-version>",
"Authorization": "Bearer <token>"
}
response = requests.post(url, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'checkfu-version': '<checkfu-version>', Authorization: 'Bearer <token>'}
};
fetch('https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive', 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/{session_id}/threads/{thread_id}/archive",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>",
"checkfu-version: <checkfu-version>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive"
req, _ := http.NewRequest("POST", url, nil)
req.Header.Add("checkfu-version", "<checkfu-version>")
req.Header.Add("Authorization", "Bearer <token>")
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/{session_id}/threads/{thread_id}/archive")
.header("checkfu-version", "<checkfu-version>")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.checkfu.com/v1/sessions/{session_id}/threads/{thread_id}/archive")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["checkfu-version"] = '<checkfu-version>'
request["Authorization"] = 'Bearer <token>'
response = http.request(request)
puts response.read_body{
"id": "<string>",
"type": "session_thread",
"agent": {
"id": "<string>",
"description": "<string>",
"mcp_servers": [
{
"type": "url",
"name": "<string>",
"url": "<string>"
}
],
"model": {
"id": "<string>",
"effort": {
"type": "low"
},
"inference_geo": "global",
"speed": "standard"
},
"name": "<string>",
"skills": [
{
"type": "anthropic",
"skill_id": "<string>",
"version": "<string>"
}
],
"system": "<string>",
"tools": [
{
"type": "agent_toolset_20260401",
"configs": [
{
"name": "bash",
"type": "bash",
"enabled": true,
"permission_policy": {
"type": "always_allow"
}
}
],
"default_config": {
"enabled": true,
"permission_policy": {
"type": "always_allow"
}
}
}
],
"type": "agent",
"version": 1
},
"archived_at": "<string>",
"created_at": "<string>",
"parent_thread_id": "<string>",
"session_id": "<string>",
"stats": {
"active_seconds": 1,
"duration_seconds": 1,
"startup_seconds": 1
},
"status": "running",
"updated_at": "<string>",
"usage": {
"input_tokens": 1,
"output_tokens": 1,
"cache_read_input_tokens": 1,
"cache_creation": {
"ephemeral_1h_input_tokens": 1,
"ephemeral_5m_input_tokens": 1
}
}
}{
"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": "runtime.invalid_transition",
"message": "<string>",
"more": "https://docs.checkfu.com/reference/errors#runtime-invalid-transition"
}
}{
"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:
2026-08-27 Maximum string length:
255Path Parameters
Pattern:
^sess_[0-9a-f]{32}$Pattern:
^sthr_[0-9a-f]{32}$Response
One persistent, independently addressable Agent thread in a Session.
One persistent, independently addressable Agent thread in a Session.
Pattern:
^sthr_[0-9a-f]{32}$Available options:
session_thread - Option 1
- Option 2
Show child attributes
Show child attributes
A canonical UTC ISO-8601 timestamp with millisecond precision.
Maximum string length:
24Pattern:
^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$A canonical UTC ISO-8601 timestamp with millisecond precision.
Maximum string length:
24Pattern:
^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$Pattern:
^sthr_[0-9a-f]{32}$Pattern:
^sess_[0-9a-f]{32}$Show child attributes
Show child attributes
Available options:
running, idle, rescheduling, terminated A canonical UTC ISO-8601 timestamp with millisecond precision.
Maximum string length:
24Pattern:
^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$Show child attributes
Show child attributes