spec-first:design

Generate technical design specifications by mapping functional requirements to system-level design elements.

72|9|Updated Mar 1, 2026
One-click install
npx skills add https://github.com/sunrain520/spec-first --skill spec-first-design
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: spec-first:design
Source: https://github.com/sunrain520/spec-first/tree/main/skills/spec-first/04-design
Command: npx skills add https://github.com/sunrain520/spec-first --skill spec-first-design

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill automates the generation of technical design specifications (DS) by mapping functional requirements (FR) to system-level design elements, ensuring consistency and traceability in the software development process.

Core Features & Use Cases

  • Automated Design Generation: Creates detailed design specifications including module boundaries, interface contracts, data models, and consistency/rollback strategies.
  • Requirement Mapping: Links generated design elements directly to their originating functional requirements.
  • Design Simplicity Enforcement: Prevents the introduction of speculative architectural layers not immediately required for the current delivery.
  • Use Case: When a new feature is defined, this Skill can automatically draft the technical design, outlining how different services will interact, what APIs they will expose, and how data will be structured, all while ensuring it aligns with the initial requirements and architectural principles.

Quick Start

Use the spec-first:design skill to generate the technical design for feature ID 'AUTH-001'.

Frequently Asked Questions about spec-first:design

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

FAQPage Schema
How do I generate technical design specifications from functional requirements?

To generate technical design specifications from functional requirements, map each requirement to system-level design elements like module boundaries and interface contracts. This ensures traceability by linking design decisions directly back to the originating functional requirements.

What is spec-first design in software architecture?

Spec-first design is an approach that automates generating technical design specifications by mapping functional requirements to system elements. It enforces design simplicity and ensures traceability by linking specifications directly to the originating requirements.

How do I define API interface contracts and data models for a new feature?

Define API interface contracts and data models by mapping functional requirements to system-level design elements. This process outlines service interactions and data structures while ensuring the design aligns with the initial requirements and architectural principles.

Can I synchronize generated design specifications with agent documentation files?

Yes, you can synchronize generated design specifications with agent documentation files. The system supports automated context synchronization with agent documentation files like CLAUDE.md and AGENTS.md to maintain consistency.

How do I prevent speculative architectural layers in system design?

Prevent speculative architectural layers by enforcing design simplicity during the specification generation process. This ensures the design only includes elements immediately required for the current delivery, avoiding unnecessary complexity.

Does this approach support consistency and rollback strategies for data modeling?

Yes, this approach supports consistency and rollback strategies for data modeling. The generated design specifications explicitly include these strategies alongside module boundaries and interface contracts mapped from functional requirements.