A lot of people are trying to reverse-engineer Fable 5 right now. Wrappers. Prompt packs. “Long-horizon agent” scaffolds. Tools that try to look like Fable from the outside. I think most of this is pointed in the wrong direction. If Fable 5 were just a prompt pattern or a wrapper, it would already be cloned. The real problem is not appearance. The real problem is robustness. Most coding agents look good at the start. Then the cracks show. - scope starts drifting - public tests b...