Hard stop a session immediately

curl --request POST \
  --url https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel"

headers = {"Authorization": "Bearer <token>"}

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

print(response.text)

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel', 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.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel",
  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>"
  ],
]);

$response = curl_exec($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.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "cancelled": true
}

{
  "code": "invalid_request",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "unauthorized",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "forbidden",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "not_found",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "evaluation_cancellation_pending",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "payload_too_large",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "unsupported_media_type",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "rate_limit_exceeded",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "internal_error",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "bad_gateway",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "managed_agents_unavailable",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "gateway_timeout",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

Sessions

Hard stop a session immediately

deprecated

Stops the session immediately and schedules durable sandbox teardown. The response confirms the session stopped; sandbox cleanup may continue asynchronously and is retried. An active Evaluation or one with unfinished clone cleanup returns retryable 409 evaluation_cancellation_pending before the session is stopped; retry after Evaluation cleanup finishes. A session that already reached a terminal status with no pending cleanup is left as it is, so the call is safe to repeat.

POST

managed-agents

sessions

{sessionId}

cancel

Hard stop a session immediately

curl --request POST \
  --url https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel \
  --header 'Authorization: Bearer <token>'

import requests

url = "https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel"

headers = {"Authorization": "Bearer <token>"}

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

print(response.text)

const options = {method: 'POST', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel', 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.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel",
  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>"
  ],
]);

$response = curl_exec($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.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel"

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

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.recursion.labelbox.com/managed-agents/v1/sessions/{sessionId}/cancel")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "cancelled": true
}

{
  "code": "invalid_request",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "unauthorized",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "forbidden",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "not_found",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "evaluation_cancellation_pending",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "payload_too_large",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "unsupported_media_type",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "rate_limit_exceeded",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "internal_error",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "bad_gateway",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "managed_agents_unavailable",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

{
  "code": "gateway_timeout",
  "message": "<string>",
  "details": {
    "field": "<string>",
    "issues": [
      "<string>"
    ],
    "requestId": "<string>",
    "retryable": true
  }
}

Authorizations

Authorization

string

header

required

A Recursion API key, created in the console under API keys.

Headers

x-tenant-id

string

Optional tenant consistency check. When present, it must name the tenant bound to the API key, including when x-organization-id is default.

Minimum string length: 1

x-organization-id

string

Organization in which to act. Required for a tenant-scoped API key. Optional for an organization-scoped key, where it must name that same organization. The value may be an organization id or default.

Minimum string length: 1

Path Parameters

sessionId

string<uuid>

required

Session id (UUID) as returned by managedAgentsStartSession or managedAgentsListSessions.

Response

Response body of POST /managed-agents/v1/sessions/{sessionId}/cancel. Cancel is terminal for the run but not for the record: the session is stopped and the sandbox torn down, while the session, its events, and its outcomes remain readable. The session row itself is removed from reads only by the separate soft-delete endpoint.

cancelled

boolean

required

Always true. The session was stopped and the sandbox closed; failures are HTTP errors instead, so this field never reports false. It is also true when the session had already reached a terminal state, making cancel safe to retry.

API reference

Endpoints

Hard stop a session immediately

Authorizations

Headers

Path Parameters

Response