$run = Clutch::run($runId)->authorizeFor($user);

$run->cancel(reason: 'The request is no longer needed.');

Cancellation is cooperative. The request is recorded immediately, the active driver is signalled, and no new model step or tool starts after that. A tool already running may finish, unless it supports interruption. The package does not pretend otherwise.

Long running tools can cooperate:

public function handle(Request $request): string
{
    foreach ($this->pages() as $page) {
        if (RunContext::current()?->isCancelled()) {
            break;
        }

        $this->analyze($page);
    }
}