Tool/function calling 

$tools = [
    [
        'type' => 'function',
        'function' => [
            'name' => 'get_weather',
            'description' => 'Get current weather for a location',
            'parameters' => [
                'type' => 'object',
                'properties' => [
                    'location' => [
                        'type' => 'string',
                        'description' => 'City name',
                    ],
                    'unit' => [
                        'type' => 'string',
                        'enum' => ['celsius', 'fahrenheit'],
                    ],
                ],
                'required' => ['location'],
            ],
        ],
    ],
];

$response = $this->llmManager->chatWithTools($messages, $tools);

if ($response->hasToolCalls()) {
    foreach ($response->toolCalls as $toolCall) {
        $functionName = $toolCall['function']['name'];
        $arguments = json_decode($toolCall['function']['arguments'], true);

        // Execute your function
        $result = match ($functionName) {
            'get_weather' => $this->getWeather($arguments['location']),
            default => throw new \RuntimeException("Unknown function: {$functionName}"),
        };

        // Continue conversation with result
        $messages[] = [
            'role' => 'assistant',
            'content' => null,
            'tool_calls' => [$toolCall],
        ];
        $messages[] = [
            'role' => 'tool',
            'tool_call_id' => $toolCall['id'],
            'content' => json_encode($result),
        ];

        $response = $this->llmManager->chat($messages);
    }
}