MCP Made AI Tools Connectable, It Did Not Make Them Understandable

A universal socket is useful, but an agent still needs a legible contract for what each tool does, when it is safe to call, and how to prove the effect.

Caption: A standard connector can make every machine reachable without explaining what the same-looking control will do.

Picture two tools on a model's menu. One is called lookup. The other is called send. Both are valid under the protocol, and both connect cleanly. Neither one tells the model whether lookup can quietly pull a customer's full email history, or whether send drafts a message for review versus firing it to an external inbox the instant it is called.

The connection succeeded, but the decision surface failed. MCP gives that surface a standard shape, but it does not make the decision legible by itself. What follows is an engineering audit of the surface, taken one layer at a time: the name,...

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