Dynamically create new context in MODX

//this could create a new context
$ctx = $modx->newObject('modContext');
$ctx->set('key','unittest');
$ctx->set('description','The unit test context for context settings.');
$ctx->save();

<?php
$_GET['key'] = 'unittest';
$_GET['description'] = 'The unit test context for context settings.';
$result = $modx->executeProcessor(array('action' => 'context/create'));
?>

$result = $modx->runProcessor('context/get',array('key' => 'web'));
if (empty($result['success'])) {
     return 'Error occurred: '.$result['message'];
}
$context = $result['object'];
$contextKey = $context['key'];
/* etc */

$result = $modx->runProcessor('context/create',array('key' => 'mynewcontext','description' => 'The new context!'));
if (empty($result['success'])) {
     return 'Error occurred creating context: '.$result['message'];
}
$newContext = $result['object'];
$newContextKey = $context['key'];