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# Three doors, one building: API, CLI, MCP API, CLI and MCP are three ways to connect an AI system to a tool. Picture one building with three entrances. 1. **API: the loading dock.** A program sends a precisely formatted request and receives structured data. Useful for bulk work,...

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Professor Glitch

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22,500 Aufrufe • vor 1 Monat •via TikTok

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CLI, API, MCP — the 3 ways your AI connects to everything (and when to use each) Your AI's brain is useless if it can't reach anything — the real power is in the connections. There are exactly 3 doors your AI can use, and once you know all three you can connect it to basically anything: DOOR 1 — CLI (the workshop) → typed commands. Commands are text, and text is what AI does best — so an AI with terminal access is a power user at your machine. And it's not just local files: GitHub, Stripe, Google Cloud, even your whole Google Workspace ship command-line tools. You say "pull last month's payments" — it types the commands. Job's on your computer or a tool has a CLI → this door. DOOR 2 — API (the service counter) → every serious online service has an official software entrance. Send a precise request, get an exact structured answer. Trade-off: each service needs its own wiring + key. Need ONE service with deep control → this door. DOOR 3 — MCP (the universal plug) → the standard built FOR AI. A service runs a small MCP server that announces its tools, and any AI can plug in — no custom wiring. Plug in once, the tools just show up. Want plug-and-play → this door. The real answer: a serious AI employee uses all three. They're not competitors — they're three doors on the same building, and you pick per job. Want to learn this whole world from scratch — AI, automations, agents, connecting everything, all the way to AI employees? That's exactly what I teach. Link in my profile. #aiagents #cli #mcp #api

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