Acceptance Pipeline Feature Design Guides agents through designing new features that extend Uncle Bob's Acceptance Pipeline Specification. Produces spec-quality output — language-neutral, implementation-agnostic, with precise behavioral requirements — that matches the style and rigor of the original spec. This is a composition skill. It does not catalog what exists (that is 's job). Instead, it provides a structured workflow for designing what comes next. When to Apply - Designing a new mutation strategy, value type, or filter mechanism for the mutator - Adding new Gherkin syntax support (dat…