Now that we understand what MCP is, let’s focus on the most important concept: Tools If MCP is the system, tools are what make it useful . 🧠 Simple Definition A tool is: A structured action that the model can choose to perform. In simple terms: 👉 If the model wants to do something , it uses a tool. ⚠️ Important Clarification A tool is not just a function . It’s a function with: a clear name a clear purpose defined inputs This structure is what allows the model to understand and use it. 🧩 What a Tool Looks Like Let’s take an example: get_user_orders(user_id, limit) Enter fullscreen mode Exit fullscreen mode This tool tells the model: what it does → get user orders what it needs → user_id, limit 🔄 How the Model Uses a Tool User asks: “Show my last 3 orders” Step 1 — Model sees available tools get_user_orders cancel_order search_products Step 2 — Model decides It thinks: “This looks like an order-related request → use get_user_orders” Step 3 — It generates a tool call { "tool" : "get_user_orders" ,…