functional-design

Create functional design documents with Mermaid diagrams from product requirements.

Updated Jan 6, 2026

Search Tags:#templates #documentation #PRD #data models #functional design #system diagrams

Ready to run

npx skills add https://github.com/yamato0811/my-agent-skills --skill functional-design-yamato0811

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: functional-design
Source: https://github.com/yamato0811/my-agent-skills/tree/main/skills/02_functional-design
Command: npx skills add https://github.com/yamato0811/my-agent-skills --skill functional-design-yamato0811

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill enables creation of high-quality functional design documents from product requirements.

Core Features & Use Cases

Guided Documentation: Step-by-step instructions and templates to document system architecture, data models, and UI/ component designs.
PRD Alignment: Ensures documentation is aligned with product requirements and existing documents (PRD and existing designs).
Reuse & Maintenance: Centralized templates for updating docs as features evolve.

Quick Start

Use the template at ./template.md to draft your functional design and save the result to docs/functional-design.md

Frequently Asked Questions about functional-design

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I convert a PRD into a functional design document?▼

To convert a PRD into a functional design document, use structured templates to draft system architecture, data models, and component designs. This ensures your documentation aligns directly with product requirements and existing designs.

What should be included in a functional design document for software projects?▼

A functional design document should include system diagrams, data models, and UI or component designs. Using structured frontmatter and templated workflows ensures these artifacts are consistently documented and aligned with the PRD.

How do I generate system diagrams and data models from product requirements?▼

You can generate system diagrams and data models from product requirements by applying Mermaid-based diagramming within a templated documentation workflow. This process translates PRD inputs into structured visual design artifacts.

Can I use templates to maintain functional design docs as features evolve?▼

Yes, you can use centralized templates to maintain functional design docs as features evolve. This supports reuse and maintenance by providing step-by-step instructions for updating system architecture and data models alongside changing PRDs.

Does formal functional design require structured frontmatter and Mermaid diagrams?▼

Formal functional design requires structured frontmatter and Mermaid-based diagrams to ensure consistency across PRD-driven workflows. Adhering to these templated documentation workflows guarantees high-quality, maintainable design artifacts.