functional-design

Functional design transforms product requirements into actionable artifacts by generating Mermaid system diagrams, TypeScript data models, and component specifications from your PRD, producing a structured design doc that guides implementation.

A functional design document specifies system architecture via Mermaid diagrams, data models as TypeScript interfaces, component responsibilities across UI/CLI and service layers, ER diagrams, API definitions, and algorithm specifications aligned to your PRD.

You can reuse an existing product requirements document or create a new one using the provided template and guide; the Skill generates design artifacts from either approach, outputting results to docs/functional-design.md.

Functional design produces standardized outputs including Mermaid diagrams for system views, TypeScript interfaces for data models, ER diagrams for database schema, API sections, component designs, and algorithm specifications in a single markdown file.

Generate a functional design blueprint when implementing core features to translate requirements into concrete architecture, data models, and component responsibilities that guide development and prevent rework.