A Cookie Clicker homage where you generate AI tokens instead of cookies built with Opus 5.5

Token Clicker is a homage to Cookie Clicker where the cookie is a prompt and the grandmas are Mac Minis. I built it with Claude Code (Opus 5.5). A few things that made a project this size work: \* Specs before code. Claude wrote the design docs first: mechanics, architecture, theme and balance. Then a "critic" pass checked the mechanics against Cookie Clicker's actual source code. Coding only started after that. \* Work packages with frozen contracts. The build was split into 18 work packages, each owning its own files. The shared types were frozen early, and ESLint rules stop one layer from importing another. That kept parallel sessions from stepping on each other. \* Tests as guardrails. About 1,700 unit tests, 22 Playwright end-to-end tests and 98% coverage on the core engine. Every change had to keep them green. \* A simulator for balance. Idle games live or die on pacing, and you can't playtest two weeks of idling by hand. A headless simulator runs the real engine over…