​
Overview

The Instructor class has a withDebug() method that can be used to debug the request and response.

It displays detailed information about the request being sent to LLM API and response received from it, including:

  • request headers, URI, method and body,
  • response status, headers, and body.

This is useful for debugging the request and response when you are not getting the expected results.

​
Example

<?php
require 'examples/boot.php';

use Cognesy\Instructor\Instructor;
use Cognesy\Polyglot\LLM\Data\LLMConfig;
use Cognesy\Utils\Str;

class User {
    public int $age;
    public string $name;
}

// CASE 1.1 - normal flow, sync request

$instructor = (new Instructor)->withConnection('openai');

echo "\n### CASE 1.1 - Debugging sync request\n\n";
$user = $instructor->withDebug()->respond(
    messages: "Jason is 25 years old.",
    responseModel: User::class,
    options: [ 'stream' => false ]
);

echo "\nResult:\n";
dump($user);

assert(isset($user->name));
assert(isset($user->age));
assert($user->name === 'Jason');
assert($user->age === 25);

// CASE 1.2 - normal flow, streaming request

echo "\n### CASE 1.2 - Debugging streaming request\n\n";
$user2 = $instructor->withDebug(true)->respond(
    messages: "Anna is 21 years old.",
    responseModel: User::class,
    options: [ 'stream' => true ]
);

echo "\nResult:\n";
dump($user2);

assert(isset($user2->name));
assert(isset($user2->age));
assert($user2->name === 'Anna');
assert($user2->age === 21);


// CASE 2 - forcing API error via empty LLM config

// let's initialize the instructor with an incorrect LLM config
$instructor = (new Instructor)
    ->withLLMConfig(new LLMConfig(apiUrl: 'https://example.com'));

echo "\n### CASE 2 - Debugging with HTTP exception\n\n";
try {
    $user = $instructor->withDebug(true)->respond(
        messages: "Jason is 25 years old.",
        responseModel: User::class,
        options: [ 'stream' => true ]
    );
} catch (Exception $e) {
    $msg = Str::limit($e->getMessage(), 250);
    echo "\nCaught exception: " . $msg . "\n";
}
?>