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

---

# FunctionDeclaration::__construct( string $name, string $description,  $parameters = null )

## In this article

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

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

Constructor.

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

 `$name`stringrequired

The name of the function.

`$description`stringrequired

A description of what the function does.

mixed>|null $parameters The JSON schema for the function parameters.

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

    ```php
    public function __construct(string $name, string $description, ?array $parameters = null)
    {
        $this->name = $name;
        $this->description = $description;
        $this->parameters = $parameters;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/php-ai-client/src/tools/dto/functiondeclaration.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-includes/php-ai-client/src/Tools/DTO/FunctionDeclaration.php#L49)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-includes/php-ai-client/src/Tools/DTO/FunctionDeclaration.php#L49-L54)

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

| Used by | Description | 
| [FunctionDeclaration::fromArray()](https://developer.wordpress.org/reference/classes/wordpress-aiclient-tools-dto-functiondeclaration/fromarray/)`wp-includes/php-ai-client/src/Tools/DTO/FunctionDeclaration.php` |

{@inheritDoc}

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

Registers WordPress abilities as function declarations for the AI model.

  |

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

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

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