Claude Can Now DO Things — Tool Use & Function Calling Explained #claude #agentic #ai

Ask Claude the weather and it'll be honest — it doesn't know, it can't know, it wasn't standing outside checking. Ask it a big multiplication and it might just get it wrong, even though it's brilliant at almost everything else. Today we fix both — not by making Claude smarter, but by teaching it when to stop guessing and go check. That's tool use, and it's the actual foundation under every "AI agent" you've heard about. In this video: What tool use actually is, in plain English, before any code Why language models are shaky at exact math — and how a calculator tool fixes it completely The 3-step loop: Claude asks, your code checks, Claude answers Giving Claude multiple tools and watching it pick the right one — or none at all Anthropic's built-in web search tool, with zero code of your own Full code + GitHub repo below. 🔗 GitHub: https://github.com/vamshisonnathi/6-c... Part 6 of the AgenticDev roadmap series. Video 1 — the 8-week roadmap: [   • AI Developer Roadmap 2026 — What to Learn,...   Video 3 — Build your first AI app:    • Build Your First AI App in 45 Minutes (Nod...   Video 5 — RAG, explained simply then built from scratch:    • RAG Explained Like You're Five #ai #claude...   Next video: a two-agent pipeline — two Claudes working together on one task. #ClaudeAPI #FunctionCalling #AgenticAI #AIDeveloper #ToolUse