Model Context Protocol Explained: How AI Assistants Connect to Everyday Tools

A DEV Community piece walks through how AI assistants can move beyond understanding requests to actually acting on them. It uses the example of checking a calendar and creating a task, noting that language models alone cannot access external applications without integration. The article contrasts understanding an action with executing one, comparing it to frontend and backend separation in software design. It introduces Model Context Protocol (MCP), an open standard that gives AI applications a common way to connect to external tools, systems, and data sources, much as USB standardizes device connections. The author stresses that MCP does not replace the underlying APIs, which services still need to communicate with their own systems.
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