//! Extension module providing core AI agent capabilities
//!
//! This module contains essential extensions that enhance AI agent functionality.
//!
//! # Key Components
//!
//! - **Extraction Tools**: Enables structured data extraction from unstructured text
//! - **Fetch Tools**: Fetch Resources Extension for Anda Engine.
//! - **Google Web Search Tool**: Enables web searches and retrieve results.
//! - **Skills Manager**: Load, create, and update file-backed skills.
//!