Stop a run

curl --request POST \
  --url https://api.antigen.sh/v1/runs/{id}/stop \
  --header 'x-api-key: <api-key>'

import requests

url = "https://api.antigen.sh/v1/runs/{id}/stop"

headers = {"x-api-key": "<api-key>"}

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

print(response.text)

const options = {method: 'POST', headers: {'x-api-key': '<api-key>'}};

fetch('https://api.antigen.sh/v1/runs/{id}/stop', 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.antigen.sh/v1/runs/{id}/stop",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "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"
	"net/http"
	"io"
)

func main() {

	url := "https://api.antigen.sh/v1/runs/{id}/stop"

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

	req.Header.Add("x-api-key", "<api-key>")

	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.antigen.sh/v1/runs/{id}/stop")
  .header("x-api-key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.antigen.sh/v1/runs/{id}/stop")

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

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'

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

{
  "id": "run_123",
  "status": "stopped",
  "agent": {
    "base": "tcell",
    "model": "claude-opus-5-cyber",
    "skills": [
      "Check authorization when one account requests another account’s resources."
    ],
    "guardrails": "Do not attempt denial of service.",
    "tools": [
      "asset_map",
      "human_tasks"
    ]
  },
  "task": {
    "instructions": "Test the production API for authorization vulnerabilities.",
    "targets": [
      "api.example.com"
    ]
  },
  "createdAt": "2026-09-13T10:00:00.000Z",
  "updatedAt": "2026-09-13T10:00:00.000Z",
  "error": null
}

{
  "error": {
    "code": "unauthorized",
    "message": "Supply a valid API key."
  }
}

{
  "error": {
    "code": "forbidden",
    "message": "The API key does not permit this operation or requested scope."
  }
}

{
  "error": {
    "code": "not_found",
    "message": "The resource does not exist in this organization."
  }
}

{
  "error": {
    "code": "conflict",
    "message": "The resource’s current state does not allow this operation."
  }
}

{
  "error": {
    "code": "rate_limited",
    "message": "Retry after the interval in Retry-After."
  }
}