实战示例
读取文章、生成 SEO 描述、保存结果和类封装写法的可复制代码骨架。
示例目标
这一页用一个完整场景串起来：
- 读取文章上下文。
- 生成 SEO 描述。
- 用户确认后保存 SEO 描述。
- 复杂逻辑改成类封装。
示例使用 zibll-ai-ext 作为命名空间，表示“用户自己写的子比主题 AI 扩展”。它不是子比主题内置 Ability 分类，也不需要用户提供完整站点源码。实际项目中可以换成你的插件 slug。
生成 SEO 描述
这个 Ability 读取文章内容，调用 AI 生成描述，但不保存数据库。
add_action( 'wp_abilities_api_init', function () {
wp_register_ability(
'zibll-ai-ext/generate-seo-description',
array(
'label' => __( 'Generate SEO description', 'zibll-ai-ext-demo' ),
'description' => __( 'Generates a concise SEO meta description for a post without saving it.', 'zibll-ai-ext-demo' ),
'category' => 'zibll-ai-ext',
'input_schema' => array(
'type' => 'object',
'required' => array( 'post_id' ),
'properties' => array(
'post_id' => array(
'type' => 'integer',
'description' => __( 'The post ID.', 'zibll-ai-ext-demo' ),
),
'length' => array(
'type' => 'integer',
'default' => 120,
'minimum' => 60,
'maximum' => 180,
'description' => __( 'Target character length.', 'zibll-ai-ext-demo' ),
),
),
'additionalProperties' => false,
),
'output_schema' => array(
'type' => 'object',
'required' => array( 'description' ),
'properties' => array(
'description' => array(
'type' => 'string',
'description' => __( 'Generated SEO meta description.', 'zibll-ai-ext-demo' ),
),
),
'additionalProperties' => false,
),
'permission_callback' => function ( array $input ) {
return current_user_can( 'edit_post', absint( $input['post_id'] ) );
},
'execute_callback' => function ( array $input ) {
$post_id = absint( $input['post_id'] );
$post = get_post( $post_id );
if ( ! $post ) {
return new WP_Error( 'post_not_found', __( 'Post not found.', 'zibll-ai-ext-demo' ) );
}
$length = isset( $input['length'] ) ? absint( $input['length'] ) : 120;
$content = wp_strip_all_tags( (string) $post->post_content );
$content = trim( preg_replace( '/\s+/u', ' ', $content ) );
if ( '' === $content ) {
return new WP_Error( 'empty_content', __( 'Post content is empty.', 'zibll-ai-ext-demo' ) );
}
$prompt = sprintf(
"请为下面文章生成一段 SEO 描述，长度控制在 %d 个中文字符左右，只输出描述文本。\n\n标题：%s\n\n正文：%s",
$length,
get_the_title( $post_id ),
wp_trim_words( $content, 300, '' )
);
$text = wp_ai_client_prompt( $prompt )
->using_system_instruction( '你是一个熟悉 WordPress 和中文内容 SEO 的编辑。输出要自然、准确，不要编造文章不存在的信息。' )
->using_temperature( 0.4 )
->using_max_tokens( 300 )
->generate_text();
if ( is_wp_error( $text ) ) {
return $text;
}
return array(
'description' => sanitize_text_field( trim( $text, " \t\n\r\0\x0B\"'" ) ),
);
},
'meta' => array(
'annotations' => array(
'readonly' => true,
'destructive' => false,
'idempotent' => false,
),
'show_in_rest' => true,
),
)
);
} );为什么 idempotent=false？因为同样输入多次调用 AI，输出可能不同。它不写数据库，但结果不保证完全一致。
保存 SEO 描述
保存能力会写数据库，所以不要标记 readonly=true，也不建议默认暴露 REST。
add_action( 'wp_abilities_api_init', function () {
wp_register_ability(
'zibll-ai-ext/save-seo-description',
array(
'label' => __( 'Save SEO description', 'zibll-ai-ext-demo' ),
'description' => __( 'Saves a SEO meta description to a post after permission checks.', 'zibll-ai-ext-demo' ),
'category' => 'zibll-ai-ext',
'input_schema' => array(
'type' => 'object',
'required' => array( 'post_id', 'description' ),
'properties' => array(
'post_id' => array( 'type' => 'integer' ),
'description' => array(
'type' => 'string',
'minLength' => 20,
'maxLength' => 220,
),
),
'additionalProperties' => false,
),
'output_schema' => array(
'type' => 'object',
'required' => array( 'updated' ),
'properties' => array(
'updated' => array( 'type' => 'boolean' ),
),
),
'permission_callback' => function ( array $input ) {
return current_user_can( 'edit_post', absint( $input['post_id'] ) );
},
'execute_callback' => function ( array $input ) {
update_post_meta(
absint( $input['post_id'] ),
'_zibll_ai_ext_seo_description',
sanitize_text_field( $input['description'] )
);
return array( 'updated' => true );
},
'meta' => array(
'annotations' => array(
'readonly' => false,
'destructive' => false,
'idempotent' => true,
),
'show_in_rest' => false,
),
)
);
} );后台应该先展示生成结果，让用户确认后再调用这个保存能力。
类封装写法
当能力变复杂时，建议继承 WP_Ability 或自己的基类。
class Zibll_AI_Ext_Post_Summary_Ability extends WP_Ability {
public function __construct( string $name, array $args ) {
parent::__construct(
$name,
array_merge(
array(
'label' => __( 'Generate post summary', 'zibll-ai-ext-demo' ),
'description' => __( 'Generates a summary for a post without saving it.', 'zibll-ai-ext-demo' ),
'category' => 'zibll-ai-ext',
'input_schema' => $this->input_schema(),
'output_schema' => $this->output_schema(),
'permission_callback' => array( $this, 'permission_callback' ),
'execute_callback' => array( $this, 'execute_callback' ),
'meta' => array(
'annotations' => array(
'readonly' => true,
'destructive' => false,
'idempotent' => false,
),
'show_in_rest' => true,
),
),
$args
)
);
}
private function input_schema(): array {
return array(
'type' => 'object',
'required' => array( 'post_id' ),
'properties' => array(
'post_id' => array( 'type' => 'integer' ),
'style' => array(
'type' => 'string',
'enum' => array( 'short', 'bullet' ),
'default' => 'short',
),
),
);
}
private function output_schema(): array {
return array(
'type' => 'object',
'properties' => array(
'summary' => array( 'type' => 'string' ),
),
);
}
public function permission_callback( array $input ) {
return current_user_can( 'edit_post', absint( $input['post_id'] ) );
}
public function execute_callback( array $input ) {
$post = get_post( absint( $input['post_id'] ) );
if ( ! $post ) {
return new WP_Error( 'post_not_found', __( 'Post not found.', 'zibll-ai-ext-demo' ) );
}
$content = wp_strip_all_tags( (string) $post->post_content );
$summary = wp_ai_client_prompt( '<content>' . $content . '</content>' )
->using_system_instruction( '请为内容生成中文摘要，只输出摘要。' )
->using_temperature( 0.5 )
->generate_text();
if ( is_wp_error( $summary ) ) {
return $summary;
}
return array( 'summary' => sanitize_textarea_field( $summary ) );
}
}注册时指定类：
add_action( 'wp_abilities_api_init', function () {
wp_register_ability(
'zibll-ai-ext/generate-post-summary',
array(
'ability_class' => Zibll_AI_Ext_Post_Summary_Ability::class,
)
);
} );类封装适合需要复用 schema、权限、AI 调用和日志处理的场景。
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