AI Agents Tool Use Explained: Search, Code, APIs & Files

What separates a chatbot from a true AI agent? Tools. In this video, you'll discover how modern AI agents break free from the limitations of pure text generation by wielding external tools — from searching the web for real-time information to executing code, calling APIs, and manipulating files. Understanding tool use is essential for building agents that can actually DO things in the real world, not just talk about them. We'll cover the fundamental architecture of tool-enabled agents, how function calling works under the hood, and walk through practical implementations of four core tool types: web search for real-time knowledge, code execution sandboxes for computation, API integrations for external services, and file operations for persistent data. You'll see real code examples using the OpenAI function calling API, learn how to design robust tool schemas, handle errors gracefully, and chain multiple tools together for complex workflows. If you're building AI applications and want to level up from simple prompt-response systems to autonomous agents, this is your roadmap. Subscribe to Sukrid LearnHub for more AI engineering content, check out our AI Agents playlist for the full series, and drop a comment telling me which tool type you're most excited to implement in your own projects. ───────────────────────────── 📚 CHAPTERS 00:00 Introduction 00:00 The Limitation of Pure LLMs 00:45 What Is Tool Use? 01:25 The ReAct Pattern 02:15 Anatomy of a Tool Definition 03:10 Function Calling with OpenAI 04:10 The Tool Execution Loop 05:05 Tool Type One: Web Search 05:50 Implementing Web Search 06:50 Web Search in Action 07:35 Tool Type Two: Code Execution 08:25 Sandboxed Code Execution 09:20 Code Execution Tool Schema 10:05 Code Execution Demo 10:55 Tool Type Three: API Integration 11:45 Building a Weather API Tool 12:40 Tool Type Four: File Operations 13:35 Chaining Tools Together 14:30 Error Handling Strategies 15:20 Parallel Tool Execution 16:10 Security Considerations 17:00 Building Your Tool Arsenal ───────────────────────────── 🔗 LINKS 📺 Full Course Playlist: https://www.youtube.com/@SukridLearnHub 🌐 Website: https://www.sukrid.com/learnhub ───────────────────────────── ⚡ SUKRID LEARNHUB Free technology education — AI, TypeScript, React, Next.js, Node.js, Golang, and Engineering. New videos regularly. All content free, forever. #ai agents #tool use ai #function calling openai #ai agent tutorial #langchain tools