Why It Exists

The problem is arithmetic, not technology. Connect 10 AI applications to 50 tools by hand and you need 500 separate integrations, each written, tested, and maintained on its own. Agree on one protocol and you need 60: each application implements the client side once, each tool implements the server side once.

That is the entire value proposition, and it is an organisational win rather than a technical one. It is the same argument that produced the Language Server Protocol for code editors, which MCP openly cites as its model.

Worth separating the real benefits from the marketing:

• Real: you can point an assistant at a tool nobody wrote integration code for, and it works.
• Real: tool builders write one server instead of one plugin per AI product.
• Real: switching AI providers does not invalidate your tool integrations.
• Not true: that MCP makes integrations more secure. It adds risk that a plain API does not have. See below.