I designed the system, wrote the spec, validated the output, and ran it through a test framework I'm building that generates constraints in isolation. Then checks the implementation against those constraints in a feedback loop until they all are met/pass. But yes, claude wrote the code.
I'm comfortable calling that building something. If you're not, that's fine, but the distinction between 'prompted an AI' and 'designed and validated a system using AI tooling' is important.