What problem does it solve? Product documentation sets (PRD, DESIGN, Phase, BUSINESS_RULES, GAPS) drift out of sync with each other and with the actual code, producing broken links, duplicated facts, and stale architecture claims. This Skill enforces a single consistent rule set and a mandatory quality gate so every document in the set stays aligned with the repository. ## Core Features & Use Cases - Document authoring and routing: Create or update PRD, product/project DESIGN, sub-DESIGNs, Phase/Roadmap, BUSINESS_RULES, and GAPS documents using dedicated references and templates, routed from /cupdate-* commands. - Consistency enforcement: Apply universal rules — no chapter numbering, relative links only, header-vs-reference link separation, bidirectional sub-document indexes, target-state writing, and fixed header field vocabulary. - Gap tracking: Record design-to-implementation divergence in GAPS.md with bounded-enumeration discovery, Current/Target/Design/Exit entries, and immutable identifiers. - Use Case: After reworking a design, ask to update the DESIGN doc; the Skill splits oversized documents into sub-DESIGNs, aligns PRD and Phase documents, and runs scripts/verify-docset.py until the quality gate passes. ## Quick Start Ask the assistant to update the project DESIGN document and align the rest of the documentation set using the dev-doc-master skill.
