Use when D-000 exists and the whole-product prototype does not, to run Claude Design in its own context and produce the prototype and design system. Also use when a later slice exposes a design gap that needs a spine revision. Requests gate 2a (prototype approved at Claude Design). Never run in the
Use when D-000 exists and the whole-product prototype does not, to run Claude Design in its own context and produce the prototype and design system. Also use when a later slice exposes a design gap that needs a spine revision. Requests gate 2a (prototype approved at Claude Design). Never run in the builder's context, and never used to author tests, acceptance criteria, or application code.