Hold up an object in front of three people. Ask all three to describe the object and what it can do. You'll get three different answers.

The fundamental difficulty with APIs is that they force clients and servers to use the same domain model. Humans are necessary because only humans have the intelligence to reconcile differences in domain models.

The idea of inventing some kind of discovery language is just deferring the difficult work of reconciliation. Computers will need to be as good at induction as the human brain before it will be possible to eliminate humans from the process.