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MCP (Model Context Protocol) lets AI assistants securely call tools you expose, turning CLI scripts, APIs, and project files into auditable, least-privilege capabilities without brittle plugins or unsafe shell access. The guide explains how MCP works (clients/servers, JSON-RPC), why it matters to Linux/Bash users, and shows a 15-minute setup, sandboxing with bubblewrap/containers, real-world use cases, and best-practice guardrails.