We've been there. JSON Schema gets hard to write as soon as your payload is non-trivial. Conditional logic, cross-field rules, business invariants, and at some point we stop writing contracts at all. We go code-first, generate the schema from annotations, and end up with 200 lines very few understand, and error messages referencing paths like #/properties/items/allOf/0/then/Then that map to nothing in our mental model. So we built Okyline. A contract is just an annotated JSON example: you describe your data the way you'd explain it to a colleague. The engine derives all validation automatically. Here's what progressive adoption looks like in practice, using an e-commerce order as a running example. Step 1 - Your JSON is already a contract No syntax to learn.…