For twenty years your API had one audience: developers. Humans read the docs, inferred your intent, asked a teammate when something looked off, and worked around the rough edges. A "good enough" spec survived for years because a person was always there to fill the gap.
That person has left the room. An AI assistant reads your spec inside the IDE and writes the integration itself. Agents call your API directly as a tool, with nobody in the loop. The AI reads everything you wrote and nothing you didn't. When your docs leave a question open, it can't ask you what you meant. It guesses, sometimes from training data that's a year stale. The code looks right, often compiles, and then fails in production. Wrong operation. Broken auth. A method that never existed.
We've now run some of the world's best-known public APIs through more than 1,400 human and AI readiness checks. Not one was fully ready for agents. If household names are failing this bar, yours probably is too. And you'd never know. The developer watches the AI stumble, gives up quietly, and no dashboard ever tells you why the integration didn't happen.
AI-ready stopped being a nice-to-have. It's becoming the baseline that decides who gets integrated and who gets skipped.
