AI Agent vs Body One AI agent is single-player. Work is multiplayer. Start with one agent. I explain it as a body. The LLM is the brain. It reads, writes, and reasons. It knows nothing about your business. RAG is the brain with a library. It looks things up in your documents before it answers. MCP is the nervous system. Model Context Protocol. One standard way to wire the brain to tools and data. Build the connection once, and any agent that speaks MCP can use it. Skills are muscle memory. Know-how saved once and loaded when a task calls for it. The agent is the brain with hands. It plans the steps, then carries them out in your tools.