Agents Don't Replace APIs. They Expose How Weak Most APIs Already Are

There is a growing narrative that AI agents, often coupled with things like Model Context Protocol, will replace APIs.

It is easy to see why that idea has taken hold. Agents can discover tools, reason about which one to call, and assemble workflows at runtime. That feels very different from the static integrations we have lived with for years, where one system calls another through a fixed endpoint, with a fixed payload, in a fixed sequence.

But the conclusion does not hold.

Agents do not replace APIs. They depend on them. What they really do is expose how fragile many APIs already are.