Without MCP you would have to write a separate integration between every AI tool and every system. MCP turns that around: your system gets a server once, and from then on any agent that speaks MCP can talk to it. It is the same idea as a printer driver or USB — one standard instead of many devices.
Two things have happened to it over the past year that most write-ups have not caught up with. One is that it is no longer one company's protocol: it now sits under the Linux Foundation. The other is that the summer 2026 specification rewrote its architecture — anyone building from a 2025 description is following an outdated picture.
The most common misconception is that MCP is a security measure. Quite the opposite: it is a surface through which the agent reaches your real systems, and the attack surface grows along with it. One survey found that 40.55% of the live servers examined exposed their tools with no authentication at all.
What it actually does, and what to watch for when you introduce it, is the subject of MCP: How AI Connects to Your Tools, a post of its own. Directly related terms: tool use, MCP server and least privilege.