Title: PromptBuilder::__construct
Published: May 20, 2026

---

# PromptBuilder::__construct( WordPressAiClientProvidersProviderRegistry $registry, WordPressAiClientBuildersPrompt $prompt = null, WordPressAiClientDependenciesPsrEventDispatcherEventDispatcherInterface|null $eventDispatcher = null )

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#wp--skip-link--target)

Constructor.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#parameters)󠁿

 `$registry`WordPressAiClientProvidersProviderRegistryrequired

The provider registry for finding suitable models.

`$prompt`WordPressAiClientBuildersPromptoptional

Optional initial prompt content.

Default:`null`

`$eventDispatcher`WordPressAiClientDependenciesPsrEventDispatcherEventDispatcherInterface
|nulloptional

Optional event dispatcher for lifecycle events.

Default:`null`

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#source)󠁿

    ```php
    public function __construct(ProviderRegistry $registry, $prompt = null, ?EventDispatcherInterface $eventDispatcher = null)
    {
        $this->registry = $registry;
        $this->modelConfig = new ModelConfig();
        $this->eventDispatcher = $eventDispatcher;
        if ($prompt === null) {
            return;
        }
        // Check if it's a list of Messages - set as messages
        if ($this->isMessagesList($prompt)) {
            $this->messages = $prompt;
            return;
        }
        // Parse it as a user message
        $userMessage = $this->parseMessage($prompt, MessageRoleEnum::user());
        $this->messages[] = $userMessage;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/php-ai-client/src/builders/promptbuilder.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/php-ai-client/src/Builders/PromptBuilder.php#L95)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/php-ai-client/src/Builders/PromptBuilder.php#L95-L111)

## 󠀁[Related](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#related)󠁿

| Uses | Description | 
| [PromptBuilder::isMessagesList()](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/ismessageslist/)`wp-includes/php-ai-client/src/Builders/PromptBuilder.php` |

Checks if the value is a list of Message objects.

  | 
| [PromptBuilder::parseMessage()](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/parsemessage/)`wp-includes/php-ai-client/src/Builders/PromptBuilder.php` |

Parses various input types into a Message with the given role.

  |

| Used by | Description | 
| [AiClient::prompt()](https://developer.wordpress.org/reference/classes/wordpress-aiclient-aiclient/prompt/)`wp-includes/php-ai-client/src/AiClient.php` |

Creates a new prompt builder for fluent API usage.

  | 
| [WP_AI_Client_Prompt_Builder::__construct()](https://developer.wordpress.org/reference/classes/wp_ai_client_prompt_builder/__construct/)`wp-includes/ai-client/class-wp-ai-client-prompt-builder.php` |

Constructor.

  |

## 󠀁[Changelog](https://developer.wordpress.org/reference/classes/wordpress-aiclient-builders-promptbuilder/__construct/?output_format=md#changelog)󠁿

| Version | Description | 
| [0.1.0](https://developer.wordpress.org/reference/since/0.1.0/) | Introduced. |

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